Flame Retardant PVC Electrical Conduit Extrusion Line For Building Cable Protection Wiring 건설

A flame retardant PVC electrical conduit extrusion line converts rigid PVC dry blend powder into rigid, self-extinguishing tubes that carry and protect building wiring for the entire service life of a structure. It is one of the highest-volume, lowest-tolerance product families in the plastic pipe world: a single mid-size plant may push several thousand tonnes a year through dies that run two or four strands at a time, at line speeds that leave no room for guesswork on temperature, vacuum or haul-off synchronization. Faygo, Wanplas 공장 with 22 years of dedicated experience in plastic pipe and profile extrusion, builds these lines as complete turnkey systems from its FAYGOPLAST plant in Zhangjiagang, a 26,650 square meter facility two hours from Shanghai Airport that holds 13 national patents including 8 invention patents and ships CE and ISO certified equipment worldwide.

This guide walks through the whole system in the order an engineer actually meets it: what the product has to do, what standards define it, how the flame retardant compound is designed, how the powder is mixed, what every machine in the line contributes, what process windows to run, how the finished conduit is tested, what goes wrong and why, and finally which Faygo configuration matches which production target. Every number here is a working engineering range, not a marketing claim, and every recipe component is named by its generic chemical function so the framework transfers to whatever local additive supply you have.

What Building Electrical Conduit Does and Why Demand Keeps Growing

전기 콘두이트는 건물 배선에 대한 기계적 및 화재 장벽이며, 그 작업 설명은 일반 용도 파이프보다 더 좁고 엄격합니다. 매설 콘크리트에 묻혀 있고, 케이블이 통과될 때 구멍을 유지하며, 바닥 시트와 보행로에 의해 압착되지 않고, 결함이 케이블을 그 등급을 초과하는 온도로 가열하면 불이 번져서 벽을 열어 circuits를 다시 연결할 수 있도록 남아 있어야 합니다. 이 목록의 항목 중 어느 것도 선택 사항이 아니며, 각 항목은 압출된 튜브의 측정 가능한 특성에 직접 대응합니다.

Two installation methods dominate. In concealed work, the conduit is fixed to the reinforcement cage or laid in the floor slab and then buried in concrete or plaster, with junction boxes left flush at outlet positions. Concealed conduit sees its worst mechanical load before it ever carries a cable: workers walk on it, wheelbarrows roll over it, and the concrete pour presses it against aggregate. This is why compression and impact classes matter more than any other property for concealed work. In surface work, the conduit is clipped to walls or ceilings and is visible, so appearance, color consistency, straightness and ultraviolet behavior become significant, along with impact resistance at the low temperatures found in unheated plant rooms and car parks.

콘duit는 케이블 트레이와 트렁킹보다는 작업에 분할되기 때문에 경쟁을 하지 않는다. 케이블 트레이와 레더 시스템은 데이터센터, 리저버, 산업용 천장에 있는 고밀도의 전원 케이블을 장기간 수평으로 배치한다. 전체 케이블이 편리하게 접근 가능하고 기계적 환경이 통제되는 곳이다. 트렁킹은 벽과 높낮이가 다른 장소에 밀도 높은, 자주 변경되는 배선을 처리한다. 콘duit는 마지막 단계에 의해서 처리되며, 여기서 회로가 개별 콘솔, 스위치, 조명장치 및 장비로 분할되며, 전선은 빌딩 구조로 사라진다. 일반적인 상업용 층에서는 트레이가 리저버와 주요 수평 배선을 담당하고, 트렁킹이 둘레 전체에 분포하며, 수십미터에 달하는 작은경통이 모든 장치 위치까지 뻗어 있다. 마지막 단계는 대량의 일을 맡는다.

Demand for flame retardant conduit is driven by three converging forces. First, electrical safety codes in almost every market have moved from prescriptive material lists to performance testing, which means a producer who can document glow-wire and compression performance can sell into markets that were previously closed. Second, the electrical load density of buildings keeps climbing: more circuits, more low-voltage systems, more device positions per square meter, all of which multiply conduit meters per building. Third, the growth of technically demanding building types such as data centers, hospitals, metro stations and high-rise residential towers has pushed specifications upward, both toward heavier duty classes and toward halogen-free variants in enclosed escape routes.

From a manufacturing standpoint, conduit is attractive because it is a high-repeat, standardized product with a stable bill of materials and a short changeover list. It is unforgiving because margins are thin, so line efficiency, scrap rate and energy per kilogram decide profitability rather than selling price. That is exactly why the machine specification deserves the attention this article gives it.

Rigid PVC conduit는 구조적으로 유사한 국제, 지역 및 국가 표준의 컴팩트한 세트를 기반으로 합니다. 이 표준은 제품의 재료가 아닌 측정 성능에 따라 제품을 분류하며, 이러한 분류를 제품에 인쇄된 숫자 코드로 인코딩합니다. 고객이 실제로 무엇을 원하는지 이해하는 가장 빠른 방법은 해당 코드를 이해하는 것입니다.

Rigid PVC conduit is governed by a compact set of international, regional and national standards that are structurally similar: they classify the product by measured performance rather than by material, and they encode those classifications in a numeric code printed on the product. Understanding the code is the fastest route to understanding what a customer is actually asking for.

The international backbone is the IEC 61386 series. IEC 61386-1 sets out general requirements for conduit systems for cable management: definitions, the classification code, and the test methods for compression, impact, bending, temperature, electrical continuity, ingress protection, corrosion resistance, tensile strength, flame propagation and suspended load. IEC 61386-21 adds the particular requirements for rigid conduit systems, which is the category that covers standard building conduit. IEC 61386-22 covers pliable conduit systems and IEC 61386-23 covers flexible conduit systems, both of which are relevant if a producer also runs a corrugated conduit line. EN 61386 is the European adoption of the same structure and is what a European specifier will normally quote. GB/T 20041 is the corresponding Chinese series, again with a general part and a rigid conduit part, and it is largely aligned with the IEC structure and test methods.

North America runs a separate framework. UL 651 covers Schedule 40 and Schedule 80 rigid PVC conduit and fittings, defining dimensional schedules by trade size rather than by metric nominal diameter, along with requirements for crush, impact at low temperature, deflection, dielectric withstand and flame behavior. Related documents cover underground duct types intended for encasement in concrete or direct burial. A producer aiming at both metric and North American markets needs two die tooling sets and two dimension control programs, because the wall thickness schedules do not map onto each other.

The IEC classification code is a string of digits, each position describing one property. The table below decodes the positions that matter most in building work and shows the values that typical conduit carries.

Code position	Property classified	Class options	Typical for building conduit
1	Resistance to compression	Very light 125 N, light 320 N, medium 750 N, heavy 1250 N, very heavy 4000 N	Light 320 N for surface work; medium 750 N and heavy 1250 N for concealed and floor work
2	충격 저항성	Very light 0.5 J, light 1 J, medium 2 J, heavy 6 J, very heavy 20.4 J	Light 1 J to medium 2 J for most indoor conduit; heavy 6 J for exposed industrial runs
3	최저 온도 한계	-5, -15, -25, -45 degrees Celsius	-5 degrees Celsius for temperate indoor use; -25 degrees Celsius for cold-climate exposed work
4	최고 온도 한계	+60, +90, +105, +120, +150, +250, +400도 섭씨 온도	+60 degrees Celsius standard; +90 degrees Celsius where cable operating temperature is higher
5	Resistance to bending	Rigid, pliable, pliable self-recovering, flexible	Rigid for the product family covered here
6	Electrical characteristics	Electrical continuity, electrical insulating, or both	Electrical insulating for all PVC conduit
7 and 8	Ingress protection, solids and water	IP first and second characteristic numerals	Commonly declared as protection against solid objects of 1 mm and against dripping or splashing water
9	Resistance to corrosion	Low, medium, high, very high	High for PVC, which is inherently non-corroding
10	Tensile strength	None declared through very heavy	Declared where the conduit will be pulled or suspended
11	Resistance to flame propagation	Non-flame propagating or flame propagating	Non-flame propagating is mandatory for building wiring conduit
12	Suspended load capacity	None declared through very heavy	Declared for conduit used to support luminaires or boxes

The practical consequence for a line builder is that duty class is mostly a wall thickness and compound stiffness decision, and both of them are set in tooling and recipe, not in the extruder. A line that will serve several duty classes needs a die head and calibration sleeve set for each combination of nominal diameter and wall schedule, plus a haul-off and cutter that hold length tolerance across a wide speed range. That is the single most commonly underestimated item in a first-time conduit project: buyers budget for the machine and forget that tooling count scales with the product matrix.

Flame Retardancy: Test Criteria, Pass Marks and the Halogen-Free Route

Flame retardancy in conduit is not a single property but a family of separately measured behaviors: whether the material ignites from a hot surface, whether a flame spreads along the tube once ignited, how fast it self-extinguishes, how much oxygen the atmosphere needs to sustain burning, and what the combustion products do to people and equipment. A compound can pass one test and fail another, so a producer needs to know which criteria the target market actually enforces before designing the recipe.

The glow-wire test is the workhorse for conduit and cable management products. A resistively heated nickel-chromium loop is pressed against the specimen at a controlled temperature for 30 seconds, and the sample must either not ignite or self-extinguish within a defined time after the wire is withdrawn, without igniting a tissue paper layer placed beneath it. Two temperature levels dominate specifications: 750 degrees Celsius for general building conduit and 850 degrees Celsius for conduit installed where an unattended fault is more likely or where the consequences are more severe. Well-formulated rigid PVC conduit passes 850 degrees Celsius comfortably; the failures we see in practice come from over-filled recipes where calcium carbonate content and lubricant load have been pushed to reduce cost, thinning the effective PVC fraction that provides the self-extinguishing behavior.

The non-flame-propagating requirement in the conduit standards uses a different apparatus. A one-meter length is mounted vertically and exposed to a defined burner flame; after the flame is removed the sample must self-extinguish within 30 seconds and the flame front must not reach the upper reference mark. This test punishes thin-wall, high-filler compounds and rewards compounds that char rather than drip.

Limiting oxygen index, or LOI, is the internal control tool of choice because it produces a single number that correlates well with field behavior and can be run quickly on a small specimen. It measures the minimum oxygen concentration in an oxygen and nitrogen mixture that will just sustain candle-like burning. Air is roughly 21 percent oxygen, so any material with an LOI above about 26 percent will struggle to burn in ambient air. Rigid PVC without any flame retardant additive typically lands between 45 and 49 percent LOI in its unfilled state, but filler, plasticizing lubricant and impact modifier all pull that number down. A practical internal specification for building conduit compound is LOI of 32 percent or higher on the finished tube, which leaves headroom against the standard tests even after normal batch variation.

UL 94 is a materials-level vertical burning classification rather than a conduit test, but it appears constantly in specifications because electrical designers are used to it. The V-0 concept requires that after two ten-second flame applications the specimen stops burning within ten seconds, that total flaming for a set of five specimens stays within an aggregate limit, that no specimen burns up to the holding clamp, and that no flaming drips ignite the cotton indicator below. Rigid PVC conduit compound designed to pass glow-wire at 850 degrees Celsius will normally also meet the V-0 behavior pattern at the wall thicknesses used in conduit, but the classification is thickness-dependent and must be declared at the thickness tested.

시험 방법	What is measured	Typical parameter	Pass criterion	What it tells the producer
Glow-wire test (GWT)	Ignition from a hot surface contact	750 or 850 degrees Celsius, 30 s contact	No ignition, or self-extinguish within the declared time, no ignition of tissue below	Whether the recipe survives a hot fault contact; sensitive to filler overload
Non-flame-propagation test	Flame spread along a vertical tube	Defined burner flame, 1 m specimen	Self-extinguish within 30 s, flame front below reference mark	Whether the wall thickness and char behavior stop vertical spread
Limiting oxygen index (LOI)	Minimum oxygen to sustain burning	Oxygen and nitrogen mixture, small bar	Internal target 32 percent or higher	Fast quantitative control number for incoming batches
UL 94 vertical burning	Material flammability classification	Two 10 s flame applications, five specimens	V-0 behavior at declared thickness, no igniting drips	Answers designers who specify by material class rather than product test
Halogen acid gas evolution	Corrosive gas released during combustion	Combustion of a weighed sample, absorption and titration	Halogen-free route requires very low halogen acid gas	Decides whether a PVC route is acceptable at all for the project
Smoke density measurement	Optical obscuration from burning sample	Sealed chamber, light transmittance	Minimum light transmittance for low smoke classification	Governs use in enclosed escape routes and underground spaces

The Halogen-Free Low Smoke Route and Where It Applies

PVC contains chlorine, and that chlorine is the reason it self-extinguishes so readily. It is also the reason that PVC combustion releases hydrogen chloride, which is corrosive to electronics and irritating to people. In most building applications this trade-off is accepted, because the conduit is buried in concrete and never becomes a significant fire load. In a defined set of environments it is not accepted, and specifications move to a halogen-free low smoke route, usually abbreviated LSZH or LS0H.

Those environments share a common feature: people or sensitive equipment are enclosed in a space with limited ventilation and long escape distances. Metro and railway tunnels, underground stations, hospital corridors, data center white space and containment, high-rise refuge floors, marine and offshore accommodation, and some airport and stadium concourses all commonly enforce halogen-free requirements. The material route is entirely different: instead of PVC, the compound is normally a polyolefin base heavily loaded with mineral flame retardants that release water when heated, together with coupling agents, char formers and processing aids to make the highly filled mass extrudable.

A producer considering both routes should be clear that they are separate product lines sharing only the downstream. The extruder configuration changes because a highly filled polyolefin is abrasive and needs different screw geometry and wear protection. The die head land length and flow channel change because melt strength and die swell differ. The compound cost sits at 높음에서 매우 높음까지 against a rigid PVC baseline of 100 index points, and line output typically drops because the mineral loading limits melt throughput. On the other hand, halogen-free conduit sells into projects that a PVC producer simply cannot bid on. Faygo can configure the downstream train — calibration, cooling, haul-off, printing, cutting, belling — so that it serves both material routes, with the extruder and die head as the exchangeable front end.

Flame Retardant PVC Compound Architecture for Conduit

A rigid PVC conduit compound is a balancing act between six competing demands: thermal stability during processing, melt flow at low shear, impact resistance at low temperature, stiffness under compression load, flame performance and cost. Every additive that improves one of these degrades at least one other, which is why conduit recipes converge on a fairly narrow family of compositions across the industry. What follows is the functional architecture, written in generic chemical terms so it transfers to any additive supply.

Base Resin

Suspension-grade PVC resin of the SG-5 type, with a K value of 65 to 67 and a corresponding average degree of polymerization around 1000 to 1100, is the standard base for rigid conduit. This grade sits at the practical sweet spot: high enough molecular weight to deliver the mechanical properties and the self-extinguishing behavior, low enough to process at the melt temperatures a conical twin-screw extruder can reach without degradation. Resins one grade higher, in the K value 68 to 71 range, give better impact and better flame behavior but need more lubricant and more processing aid and will run slower. Resins one grade lower flow more easily but lose impact strength and give a conduit that cracks during bending and belling.

입수되는 각 로트에 대해 확인해야 하는 수지 품질 매개변수는 명시적 부피 밀도, 플라스틱화제 흡수량, 휘발성 내용물, 물방울 수 및 잔류 비닐 클로라이드 모노머입니다. 특히 부피 밀도와 포름은 혼합 시 안정제와 윤활제가 수지 내에 얼마나 빨리 흡수되는지를 제어하며, 공급업체가 변경되면 혼합 주기 조정이 필요할 수 있습니다. K 값이 명목상 동일하더라도.

Heat Stabilizer System

PVC begins to dehydrochlorinate above roughly 150 degrees Celsius, releasing hydrogen chloride which then autocatalyzes further degradation, producing conjugated polyene sequences that appear as yellowing and then browning. The stabilizer package interrupts that chain by scavenging hydrogen chloride, replacing labile chlorine atoms and neutralizing the acid formed.

칼슘-저지 안정제 systems have replaced lead salt systems as the default for building conduit in almost every export market, driven by restrictions on heavy metals in construction products. A modern calcium-zinc package for conduit is a one-pack containing the metal soaps, a co-stabilizer such as a polyol or a beta-diketone, an epoxidized co-stabilizer, an antioxidant and part of the lubricant system. Dosage typically sits at 4 to 6 parts per hundred resin. Under-dosing shows up as burn marks and progressive yellowing during any interruption; over-dosing causes plate-out on the die land and a loss of early color hold.

Filler

Fine, surface-treated calcium carbonate is the standard filler. It reduces raw material cost index, increases modulus and improves dimensional stability, and it slightly improves flame behavior by diluting the combustible fraction and acting as a heat sink. It also reduces impact strength, increases melt viscosity, accelerates screw and die wear, and beyond a threshold degrades surface gloss and glow-wire performance. Particle size matters as much as loading: a mean particle size around 1 to 2 micrometers with stearate surface treatment disperses well and hurts impact far less than a coarser, untreated grade at the same loading.

Processing Aid and Impact Modifier

아크릴 처리 보조제, generically an ACR, is a high molecular weight acrylic copolymer that promotes fusion of the PVC primary particles, raises melt strength and elongation, and eliminates the shark-skin and matte surface that unfused compound produces. In conduit recipes it typically sits at 1 to 2 parts per hundred resin. It is the cheapest fix for a poor surface, and the first thing to raise when a new resin lot runs cold.

The impact modifier gives the conduit its ability to survive a hammer blow at low temperature and to be belled without splitting. Chlorinated polyethylene, generically CPE, is the workhorse for conduit because it is compatible with PVC, weather-stable and moderately priced; typical loading is 4 to 8 parts per hundred resin. Methacrylate-butadiene-styrene, generically MBS, gives higher impact efficiency per part and better clarity but is less weather-stable and costs more, so it appears mainly in thin-wall or high-class impact products. Acrylic impact modifiers sit between the two and are the choice for conduit that will see prolonged outdoor exposure.

Lubricant System

Lubricants are the least understood and most frequently mis-set part of a rigid PVC recipe. They divide into internal lubricants, which reduce friction between polymer chains and therefore lower melt viscosity and internal heat generation, and external lubricants, which migrate to the metal interface and reduce sticking to screw, barrel and die surfaces. Calcium stearate is predominantly internal; paraffin wax and polyethylene wax are predominantly external; oxidized polyethylene wax and stearic acid straddle both.

The balance decides fusion timing. Too much internal lubricant and the compound fuses too early, generating heat in the compression zone, raising torque and producing burn marks. Too much external lubricant and the compound fuses too late, arriving at the die under-gelled with poor weld line strength and a dull, streaky surface, and depositing plate-out on the die land within an hour of running. A conduit recipe usually lands around 0.3 to 0.8 parts per hundred resin of internal lubricant and 0.4 to 1.2 parts of external lubricant, with the exact split tuned on the machine, because it depends on screw geometry and line speed as much as on chemistry.

Flame Retardant Additives

Rigid PVC is already self-extinguishing, so flame retardant additives in a conduit recipe are there to restore performance lost to filler and impact modifier, and to lift the compound from merely passing to comfortably passing. Aluminum hydroxide, generically ATH, is the most common addition: it decomposes endothermically above roughly 200 degrees Celsius, absorbing heat and releasing water vapor that dilutes the flammable gas layer, and leaving an aluminum oxide residue that reinforces the char. Loadings of 5 to 20 parts per hundred resin are usual. It also acts as a partial filler, which means an ATH increase should be offset by a calcium carbonate decrease to hold the mechanical properties.

Antimony trioxide is a synergist rather than a flame retardant in its own right. In the presence of the chlorine already in the PVC it forms antimony oxychloride and then antimony trichloride in the flame zone, which is a highly effective gas-phase radical scavenger. Because the chlorine source is free, small loadings of 2 to 5 parts per hundred resin produce a disproportionate improvement in glow-wire and LOI results. Phosphate ester additives contribute in the condensed phase by promoting char formation and can partially plasticize, so they are used sparingly in rigid conduit where stiffness must be preserved.

Pigment

Conduit color is functional, not decorative: markets use white, light gray, orange and red to distinguish electrical services from plumbing and gas, and some codes assign specific colors to specific circuit types. Titanium dioxide of the rutile type provides opacity and ultraviolet screening and typically sits at 0.5 to 4 parts per hundred resin depending on the shade. Carbon black at very low loading is used for gray shades and for the black conduit used in some exposed applications, where it also provides the best ultraviolet protection available. Organic pigments for orange and red shades must be checked for heat stability at the processing temperature, because a pigment that survives 190 degrees Celsius in a laboratory test can still shift shade in the die land where residence time is longer.

성분	Typical loading (phr)	주 기능	과다 복용 시 위험 있음
PVC resin, SG-5, K value 65 to 67	100 (reference)	Base polymer, stiffness, inherent flame resistance	해당 사항 없음; higher K value raises torque and slows the line
칼슘-아연 원 패스 안정제	4.0 to 6.0	Hydrogen chloride scavenging, color hold, lubrication contribution	다이 토대에 플라이트 아웃, 초기 색상 손실, 높은 비용 지수
Surface-treated calcium carbonate	8~25	Cost index reduction, modulus, dimensional stability	Impact loss, glow-wire failure, surface roughness, accelerated wear
아크릴 처리 보조제 (ACR)	1.0 to 2.0	Fusion promotion, melt strength, surface gloss	과도한 용융 강도, 높은 토크, 다이 압력 상승
Impact modifier (CPE type)	4.0 to 8.0	Low-temperature impact, belling and bending resistance	강성 손실, 압축 등급 실패, 비카트 하락
Impact modifier (MBS type, optional)	3.0 to 6.0	얇은 벽 제품에서의 높은 영향 효율성	Reduced weather stability, higher cost index
내부 윤활제 (calcium stearate type)	0.3 to 0.8	용융 점도 감소, 내부 마찰 제어	Early fusion, torque spike, burn marks
External lubricant (paraffin and PE wax)	0.4 to 1.2	Metal release, die land flow, surface finish	늦은 융합, 약한 용접 선, 플라이트 아웃, 둔한 표면
Aluminum hydroxide (ATH)	5 to 20	Endothermic decomposition, smoke suppression, char reinforcement	Melt viscosity rise, impact loss, output reduction
Antimony trioxide synergist	2.0 to 5.0	Gas-phase radical scavenging with the resin chlorine	Cost index rise with diminishing returns, opacity shift
Phosphate ester char former	0 to 3.0	Condensed-phase char promotion	Partial plasticizing effect, stiffness and Vicat loss
Titanium dioxide, rutile	0.5 to 4.0	Opacity, whiteness, ultraviolet screening	Cost index rise, slight abrasion increase
Color pigment package	0.1 to 1.5	Service identification color	Heat instability, shade drift in the die land

뜨거운 물과 차가운 혼합: 분말을 안정적인 건조 혼합물로 전환하기

Everything the extruder can achieve is limited by the quality of the dry blend it receives, and dry blend quality is decided in the mixer, not the extruder. The standard arrangement is a two-stage unit: a high-speed hot mixer above and a horizontal cooling mixer below, connected by a discharge chute, with the cooled blend conveyed to a storage silo.

In the hot mixer, a set of blades running at high tip speed drives the charge into a toroidal flow pattern. Almost all of the heat comes from mechanical friction rather than from the jacket, so the temperature rise is a direct function of blade speed and fill level. The purpose is not simply to mix but to open the porous PVC resin particles and drive the liquid and low-melting additives into that porosity, so that the finished blend behaves as a single free-flowing powder rather than a mixture of resin plus a dusty additive fraction.

The dosing sequence matters as much as the temperatures. Resin is charged first and allowed to reach roughly 60 to 70 degrees Celsius before the stabilizer package is added, because the resin porosity opens as it warms and the stabilizer needs to be absorbed rather than simply coated on. Lubricants follow. Filler and flame retardant additives are added later, around 90 degrees Celsius, because adding a large mineral fraction early absorbs the liquid additives onto the mineral surface instead of into the resin. Pigment goes in with the mineral fraction. Discharge occurs at 110 to 120 degrees Celsius. Going above roughly 125 degrees Celsius risks pre-gelation of the blend, which shows up later as fish-eyes and unmelted specks in the conduit wall.

냉각 혼합기는 즉시 뜨거운 혼합물을 수거하고, 물 장착된 쉘과 느린 수평 리본 또는 패들로 40~50도 섭씨로 낮춥니다. 그 작업은 적색화 또는 부분 융합이 발생하기 전에 열 역사를 멈추고, 실트에서 발생하는 응집을 방지하는 것입니다. 혼합기가 핫 믹서에 비해 작으면 사이클 병목 현상이 되므로 두 개는 일반적으로 냉각 믹서가 핫 믹서의 두 배에서 세 배의 볼륨으로 일치됩니다.

냉각 후 블렌드는 휴식을 취해야 합니다. 실에서 8~24시간의 숙성 기간을 갖게 되면 잔여 첨가제의 이동이 완료되고 수분 균형이 이루어져서, 믹서에서 바로 블렌드를 공급하는 경우와 비교해 엑스트루더 토크를 눈에 띄게 안정화시킵니다. 블렌드를 바로 공급하는 생산자들은 배치의 첫 시간 동안 융합 지점이 이동하는 현상을 경험합니다.

Mixing stage	Temperature window	Materials added	Purpose	Control point
Charge and preheat	Ambient to 60 degrees Celsius	PVC resin only	Open resin porosity by frictional heating	Fill level 65 to 75 percent of working volume
Stabilizer addition	60 to 70 degrees Celsius	Calcium-zinc one-pack, antioxidant	Absorption into resin porosity, not surface coating	Add through the side port with blades at full speed
Lubricant addition	75 to 85 degrees Celsius	Internal and external lubricants	Distribute release and flow control agents evenly	필러 추가 전에 간격은 60초 이상이어야 합니다.
Filler and flame retardant addition	85 to 95 degrees Celsius	Calcium carbonate, ATH, synergist, impact modifier	Bulk the blend after liquid absorption is complete	Watch the motor current step change as fill rises
Pigment addition and homogenization	95 to 110 degrees Celsius	Titanium dioxide and color pigment	Final color development and dispersion	Run a color chip check every batch
Discharge	110 to 120 degrees Celsius	없음	Transfer to cooling mixer before pre-gelation	Never exceed 125 degrees Celsius discharge
Cooling	Down to 40 to 50 degrees Celsius	없음	Freeze the thermal history, prevent caking	Cooling water at 15 to 22 degrees Celsius
Maturation in silo	Ambient	없음	Additive equilibration, stable extruder torque	8 to 24 h rest before feeding the line

Two blend properties should be measured routinely because they predict extruder behavior. Bulk density for a conduit dry blend typically falls between 0.52 and 0.62 grams per cubic centimeter; a drop of more than about 0.03 signals that filler dispersion or mixing temperature has drifted. Dry flow, measured as the time for a fixed volume to pass through a standard funnel, predicts whether the forced metering feeder will deliver a constant charge to the extruder. A blend that flows poorly will bridge in the feeder throat and produce a slow oscillation in wall thickness that no downstream control can remove.

Machine-by-Machine Walkthrough of the Conduit Extrusion Line

A flame retardant PVC electrical conduit extrusion line is a synchronized train of ten functional stations. Each one has a defined job, a defined specification set and at least one PVC-specific requirement that separates it from the equivalent machine on a polyolefin line. The walkthrough below follows the material from silo to pallet.

6.1 Conical Twin-Screw Extruder

The conical twin-screw extruder is the correct first choice for rigid PVC conduit, and the reasoning is worth spelling out because buyers new to PVC often ask why a single-screw machine will not do. Rigid PVC is supplied as a dry blend powder, not as pellets. A single-screw extruder relies on friction against the barrel wall to convey, which works poorly with a low bulk density powder and produces inconsistent output. A conical twin-screw has intermeshing, counter-rotating screws that convey positively, like a pump, so output is set by screw speed and is almost independent of feed variation. It also generates far less shear heat per kilogram than a single screw at equivalent output, which is decisive for a polymer that begins to degrade a few tens of degrees above its processing temperature.

원뿔 형상은 두 가지 추가 이점을 제공합니다. 피드 쪽의 큰 지름은 큰 부피 흡입과 부드러운 예열 및 데보탈리제화를 위한 큰 열 전달 표면을 제공하며, 배출 쪽의 작은 지름은 짧은 축 방향 길이에서 적절한 토크로 높은 압력 구축을 가능하게 합니다. 경사 또한 압축 비율이 기하학적으로 내장되어 있으며, 채널 깊이 변경에 전적으로 의존하지 않습니다.

Vacuum venting partway along the barrel is mandatory, not optional. Dry blend carries adsorbed moisture, entrained air and volatile decomposition fragments, and any of them left in the melt produces surface porosity, a pitted bore and reduced dielectric performance. A vent operating at roughly minus 0.06 to minus 0.09 megapascal gauge, with a properly designed decompression zone ahead of it so the melt seal does not break, removes them.

Corrosion protection is the other non-negotiable. Hydrogen chloride released by even minor local degradation attacks nitrided steel rapidly. Conduit-duty screws and barrel liners should be bimetallic, meaning a centrifugally cast corrosion and wear resistant alloy layer metallurgically bonded to the base steel, rather than only nitrided. Screw shafts should be chrome plated over the bimetallic layer where budget allows, and the die head flow channel should be hard chrome plated and polished. This is the single largest determinant of consumable life on a PVC line.

원뿔형 이중 스크류 모델	스크류 직경, small to large end (mm)	나사 속도 범위 (rpm)	Output range on conduit blend (kg/h)	주 드라이브 전력 (kW)	Typical conduit range served
SJZ 45/90	45 to 90	1 ~ 38	80~130	18.5 to 22	dn16 to dn25, two cavities
SJZ 51 / 105	51 to 105	1 ~ 38	120 to 200	22 to 30	dn16 to dn32, two or four cavities
SJZ 55/110	55 to 110	1 to 36	160 to 250	30~37	dn16 to dn40, two or four cavities
SJZ 65/132	65 to 132	1에서 34까지	250 to 350	37 ~ 55	dn20 to dn50, two or four cavities
SJZ 80/156	80 to 156	1 to 32	400 to 550	75에서 90	dn32 to dn110, one or two cavities
SJZ 92/188	92 to 188	1 to 30	600 to 800	110 to 132	dn50에서 dn160까지의 두꺼운 벽, 하나의 구멍

Output figures assume a conduit-grade dry blend with a filler loading in the 10 to 20 parts per hundred resin band and a stable maturation history. A heavily filled or heavily flame-retarded blend will run at the lower end of each band because melt viscosity rises and the achievable screw speed drops before torque limits are reached.

6.2 Forced Metering Feeder and Vacuum Loading

A conical twin-screw extruder is starve-fed through a forced metering feeder mounted on the feed throat: a vertical single or twin auger, driven by its own variable-speed motor, that pushes a controlled volumetric charge into the screws. Free-flow gravity feeding is not acceptable for PVC dry blend because the low bulk density powder bridges and the resulting feed variation appears immediately as wall thickness oscillation.

공급기 속도는 일반적으로 추진기 스크류 속도와 설정 비율에 의해 조절되며, 비율은 공급 자닛이 부분적으로 채워진 상태로 유지하도록 조정됩니다. 너무 빠른 속도로 돌리는 경우 공급 자닛이 채워져 뒤통수가 막히고 공급 조인트에 온도가 상승하여 공급기가 starved 된다면 출력은 저하되고 압력이 감소합니다. 재료 계량기로 제어되는 라인에서는 이 비율에 의해 미량식 측량 계통이 설정되어 배출 재료량에 대한 마팅게이트를 닫는 데 기여해 효율적인 라인을 운영할 수 있습니다.

진공 로딩은 블렌드를 실 또는 혼합 영역에서 피더 호퍼로 가져옵니다. PVC 건조 블렌드의 경우 로더에는 넉넉한 필터 영역과 자동 역 펄스 청소 사이클이 있어야 합니다. 왜냐하면 미세 필러 먼지가 표준 필터를 빠르게 막기 때문입니다. 작은 호퍼에 장착된 레벨 센서 쌍은 피더 호퍼를 정의된 한계 범위 내에 유지하여 측정 어거트의 헤드 압력이 일정하게 유지되도록 합니다.

6.3 Multi-Cavity Pipe Die Head

The die head is where conduit economics are decided. Small conduit at dn16 to dn25 has such a small cross-sectional area that a single strand cannot absorb the output of even a mid-size extruder without running the haul-off at a speed the cooling train cannot support. The industry answer is the multi-cavity die: one extruder feeding a manifold that splits the melt into two or four identical flow paths, each with its own mandrel, die ring and calibration sleeve. A one-out-of-two die typically doubles output at the same line speed; a one-out-of-four die quadruples it.

엔지니어링 과제는 흐름 채널 대칭성입니다. 모든 부위가 동일한 온도와 동일한 각하력 및 동일한 비율로 동일한 용량을 공급받지 않는다면, 섬유의 지름, 두께 및 색상이 달라집니다. 즉, 다관은 모든 구멍으로 동일한 경로 길이와 동일한 단면적 개발을 갖도록 기하학적으로 균형이 맞춰져 있어야 하며, 전체 금형 본체는 각 브랜치에서 더 덥지 않도록 구역별로 가열되어야 합니다. 완벽한 기하학적 균형이 불가능한 경우에, 각 브랜치에 가혹한 막대 또는 조절 가능한 개구구를 설치해 줌으로써 시운전 중에 겨우 조절할 수 있습니다.

각 구멍 내에서는 용융물이 맨드렐 지지대 주위에 분할되어야 하며 다시 결합되어야 하는데, 이로 인해 용접선이 생성됩니다. 단단한 PVC의 용접 강도는 분할 후의 용융 온도, 체류 시간 및 재결합 지점에서의 압력에 직접적으로 영향을 받으므로 압축 비율은 압출기 토대에 - 일반적으로 콘duit의 경우 2.5에서 4로 1 - 선택되어야 하며 용융물이 토대에서 빠져나갈 때 용접이 완료될 수 있도록 보장해야 합니다. 콘duit가 벨링 중에 수평으로 분할되는 경우 거의 항상 용접선 문제가 여기에서 기인합니다.

다이 립 조절은 벽 두께 분포를 주변에서 조정합니다. 다이 링에 있는 방위 조절 나사는 작업자가 링을 맨드렐과 비교하여 몇 밀리미터씩 이동시켜, 중력에 의한 자연스러운 두께 감소 및 다중의 비대칭에 따른 두께 변화 등을 보정할 수 있습니다. 4 개의 구멍이 있는 다이의 경우, 각 구멍별로 조절해야 하므로, 좋은 다이 설계는 히터 밴드를 해체하지 않고도 작업자가 접근할 수 있는 위치에 조절 나사를 배치합니다.

Die head temperature zoning for a conduit die usually runs three to five zones: adapter, manifold, body, and one or two land zones. A common practice is a slightly descending profile from the adapter to the die land, so the melt is hottest where it needs to flow and slightly cooler where it needs melt strength to hold its shape on exit.

6.4 진공 캘리브레이션 탱크 and Cooling Tank

Immediately after the die, the soft tube enters a calibration sleeve inside a vacuum tank. The sleeve is a precision-bored, slotted metal ring whose bore sets the outside diameter of the conduit. Vacuum in the tank pulls the hot tube outward against the sleeve bore while spray or immersion water freezes the outer skin, so that the conduit leaves the sleeve with its final outside diameter locked in.

Sleeve bore is not equal to the target conduit diameter. It must be larger by the shrinkage allowance, which for rigid PVC conduit is typically 0.5 to 1.2 percent depending on wall thickness and cooling rate. Thicker walls shrink more because more heat remains in the core after the sleeve. Getting this allowance right is a commissioning task, and it is one of the reasons trial production with the customer’s own compound before shipment is worth the time it takes.

소형 배관의 진공 수준은 일반적으로 마이너스 0.02에서 마이너스 0.05 메가파스칼 계기 사이입니다. 진공이 너무 적으면 튜브가 슬리브에 단단히 맞지 않아 비정상적인 크기의 배관과 곡선 모양의 표면이 생깁니다. 진공이 너무 많으면 튜브가 슬리브에 강하게 당겨져 긁힘, 수직 절삭 및 하중이 증가합니다. 다중 구멍 라인에서 각 슬리브 위치에는 자체 진공 조절 밸브가 있어 스트랜드를 독립적으로 균형시킬 수 있습니다.

The cooling tank downstream continues heat removal until the core is solid enough that the conduit will not distort under the haul-off caterpillar pressure or deform during cutting. Water temperature is a real process variable, not a utility detail: 15 to 22 degrees Celsius is the practical window. Colder water freezes the skin too fast and locks in residual stress that later shows as bowing and as cracking during belling. Warmer water lengthens the required tank and slows the line. Tank length is sized so total residence gives full through-thickness cooling; for conduit this is usually a 6 meter vacuum tank plus 6 meters of spray cooling for the smaller sizes, extending as diameter and wall thickness increase.

6.5 Caterpillar Haul-Off

The haul-off sets line speed, and through line speed it sets wall thickness for a given extruder output. A two-track or three-track caterpillar with polymer-faced pads is standard for conduit. Pads should be profiled or soft enough to grip without denting: a rigid flat pad on a thin-wall dn16 conduit will oval the tube.

Three specifications matter. Traction force must exceed the drag from the calibration sleeve and the cooling tanks with margin; for small conduit this is modest, but a four-cavity line multiplies the drag by four. Speed range must cover the whole product matrix, typically 0.5 to 30 meters per minute for a conduit line. Speed stability is the critical one: any ripple in haul-off speed transfers directly into a wall thickness ripple, so a servo or high-quality vector drive with encoder feedback is worth specifying over an open-loop inverter.

On multi-cavity lines, all strands pass through a single wide caterpillar, so they are mechanically synchronized by definition. That is an advantage for consistency but it means a diameter difference between cavities cannot be corrected at the haul-off; it must be corrected at the die and the vacuum trim.

6.6 On-Line Wall Thickness and Diameter Measurement

Continuous measurement replaces the destructive spot check and pays for itself by letting the line run closer to the minimum wall rather than carrying a safety margin of extra material on every meter produced. Two technologies dominate. Laser diameter gauges use one to three measuring axes to give outside diameter and ovality in real time and are inexpensive and reliable. Ultrasonic wall thickness gauges run in a water-coupled measuring head and report wall thickness at several points around the circumference, which is what actually controls both compliance and material consumption.

The practical arrangement for a conduit line is a laser gauge immediately after the vacuum tank for fast diameter feedback, plus an ultrasonic head after the cooling tank for wall thickness. The measurements feed a controller that trims haul-off speed to hold wall thickness and alarms if ovality or diameter drifts outside the tolerance band. On a four-cavity line the gauge should be able to index across all four strands or, better, one gauge per strand for the diameter measurement.

6.7 Printing and Batch Coding

모든 콘두이트는 읽기 쉬운 레전드가 부착되어야 하며, 화재 방지 콘두이트의 경우 레전드는 장식용이 아니라 준수 문서입니다. 일반적으로 제조업체 식별, 명상 크기, 표준 참조, 분류 코드, 화재 방지 마킹, 생산 날짜 및 교대, 그리고 연속 미터 마크가 포함됩니다. 특정 화합물 배치를 추적할 수 있으면 생산업체는 문제가 한 교대에서 발생하는 것이 아니라 한 해 동안 발생하는 것을 막을 수 있습니다.

Two printing technologies are used. Continuous ink-jet coding is flexible, allows the legend to change without hardware changes and handles variable data such as batch numbers and meter marks; it needs solvent management and periodic head maintenance. Hot foil or hot stamping printing produces a very durable mark that survives concrete pouring and abrasion but requires a physical type set for each legend change. Many conduit producers run ink-jet for the variable data and rely on an embossed or co-extruded color stripe for permanent identification.

6.8 Cutting: Chipless Cutter and Planetary Saw

Conduit is cut to a fixed length, usually 3 or 4 meters, by a traveling cutter that clamps onto the moving tube, accelerates to line speed, cuts, and returns. Two mechanisms are used, and the choice matters more for conduit than for most pipe.

A chipless cutter uses a hardened circular blade that is driven radially into the rotating clamped tube, displacing rather than removing material. It generates no dust and no chips, which is a significant advantage on a conduit line because PVC dust in the cooling water and on the shop floor is both a housekeeping problem and a contamination route back into the product. It leaves a slightly raised internal burr, which is acceptable for conduit since cables are pulled, not pushed.

A planetary saw carries a circular saw blade that orbits around the tube while the whole carriage travels with the line. It produces a very square, clean cut with no internal burr, which is preferable when the cut end will be belled, because a burr can initiate a split during expansion. It generates chips and needs extraction. For a conduit line that includes a belling machine, the planetary saw is generally the better investment.

길이 정확도는 인코더 측정 튜브 이동량과 클램프 및 가속화 순서에 의해 설정됩니다. 잘 설정된 절단기는 4m의 절단 시에 ±3~5mm 이내의 고정 길이를 유지할 수 있습니다. 이는 일반적인 콘두이트 허용 범위 내에 있습니다.

6.9 벨링 기계

전기 배관은 일반적으로 솔벤트 시멘트로 한 길이를 다음 길이의 소켓, 즉 벨에 밀어 넣어 결합합니다. 압력 파이프와는 달리, 배관 소켓에는 일반적으로 밀봉링 groove가 없으므로 툴링이 크게 간소화됩니다: 소켓은 평평하고 약간 비스듬한 팽창 부분으로, 정해진 깊이와 정지 어깨가 있습니다.

중앙화 공급을 위한 사업 논리는 간단합니다. 단일 대용량 본체로 수십 개의 분리된 소형 펌프와 열오픈 채널을 대체하여 유출 손실을 줄이고 농장 단위로 원활한 온도 조절이 가능해집니다. 이러한 고밀도 흐름은 전선 시스템에서 가장 큰 직경의 파이프에서 허용 가능한 편차를 유지할 수 있음 의미하며, 위에 설명한 이유에서 연결 시스템의 품질 평가에 접속합니다. 이 지침의 나머지 부분에서는 이러한 관점에서 관련 내용을 다룰 것입니다.

Socket depth is set by the standard and by the fitting range, and for conduit is typically 1.2 to 2 times the nominal diameter. Two failure modes dominate. Splitting during expansion indicates either insufficient heating time, a temperature profile that softened only the surface, a weld line weakness from the die, or an impact modifier loading that is too low. Socket relaxation, where the expanded end contracts over the following days and no longer accepts the spigot, indicates insufficient chilling time on the mandrel, so the frozen shape was not fully set before ejection.

네 개의 스트랜드를 처리하는 배관 라인은 단일 스트랜드 라인에 비해 길이당 분당 4배의 길이를 생성하므로 벨링 용량이 종종 숨겨진 병목 요소입니다. 다중 스테이션 벨링 기계 또는 두 대의 기계가 병렬로 배치되면 최대 라인 출력을 기준으로 크기를 결정해야 합니다.

6.10 자동 스택 및 번들링

마지막 스테이션은 절단 및 벨린된 길이를 번들로 정량화한 다음 스트랩 또는 축축한 포장으로 합니다. 기울어진 수집 테이블에 카운터가 장착되어 각 길이가 크래들로 떨어집니다. 개수가 도달하면 크래들이 스트랩 위치로 인덱싱되고 반자동 또는 자동 스트랩 헤드가 두 개 또는 세 개의 스트랩을 적용합니다. 배관의 경우 번들 형상은 효율적인 포장 및 운송을 위해 일반적으로 육각형입니다.

이 스테이션은 일반적으로 주목받지 못합니다. 20m / 분의 속도로 dn16의 네 개의 스트랜드를 생산하면 절단 길이는 약 3초마다 하나씩 생성됩니다. 이 속도로 수동 수집에는 두 명의 작업자가 필요하며 여전히 손상된 끝이 발생합니다. 자동 스택기에 번들링 스테이션이 있으면 노동력과 손상을 모두 제거하고 깨끗하고 개수 가능한 단위를 창고에 공급할 수 있습니다.

배관 크기별 공정 매개변수 창

Process settings for rigid PVC conduit are size-dependent in a way that polyolefin pipe settings are not, because the thermal window is narrow and the ratio of surface area to mass changes sharply across the conduit size range. The tables below give working windows for the common building sizes from dn16 to dn50. They are starting points for commissioning, to be refined against the actual compound.

Nominal size	벽 두께, light 320 N (mm)	벽 두께, medium 750 N (mm)	벽 두께, 무거운 1250 N (mm)	Recommended die cavities	Recommended extruder	운반 속도 (m/min)	Line output (kg/h)
dn16	1.0	1.2	1.4	4	SJZ 51/105 or SJZ 55/110	14 to 22	130 to 190
dn20	1.1	1.25	1.5	4	SJZ 51/105 or SJZ 55/110	12 to 19	150 to 210
dn25	1.2	1.4	1.7	4 or 2	SJZ 55/110 or SJZ 65/132	10 to 16	180 to 260
dn32	1.4	1.6	2.0	2	SJZ 65/132	8 ~ 13	210 to 300
dn40	1.6	1.8	2.2	2	SJZ 65/132	6 to 11	240 to 330
dn50	1.8	2.0	2.5	2 or 1	SJZ 65/132 or SJZ 80/156	5 to 9	270 to 420

벽 두께 values are representative of common building conduit schedules and must be confirmed against the specific standard edition the product is certified to, because national schedules differ by a tenth of a millimeter in several sizes. What does not vary is the relationship: each step up in compression class adds wall, and adding wall at constant extruder output forces line speed down, so the heavy class always costs output relative to the light class on the same machine.

Temperature Profile and Pressure Targets

구역	온도 창 (도씨)	기능	Symptom if too low	너무 높을 경우의 증상
배럴 영역 1 (피드)	160 to 175	건조 혼합물을 예열하고 압축하십시오.	Poor conveying, output drop, surging	Bridging in the feed throat, early fusion
배럴 영역 2	165 to 180	Begin fusion of primary particles	Unfused specks in the wall	Torque spike, early degradation
Barrel zone 3	170 to 185	Complete fusion, devolatilize at the vent	Porosity, vent flooding	Yellowing, hydrogen chloride odor
Barrel zone 4 (metering)	175 to 190	Homogenize and build pressure	Low die pressure, wall variation	Burn marks, black specks
Adapter	180 to 190	Transfer melt to the die head	Pressure rise, flow instability	Degradation in a long residence path
Die head manifold	180 to 192	Split melt to cavities evenly	Cavity-to-cavity imbalance	Streaking, color drift
Die body	178 to 190	Form the annular section, heal weld lines	Weak weld lines, splitting at belling	Melt fracture on exit, sagging
Die land	172 to 185	Set surface finish and melt strength	Rough surface, shark skin	Loss of melt strength, drawdown
녹는 압력 at die	12 to 22 MPa typical	흐름을 조절하고 용접을 회복시킵니다.	Under-gelled, low weld strength	Excess shear heat, torque limit
Vacuum tank	-0.02에서 -0.05 MPa gauge	Seat the tube against the sleeve	Undersize, out-of-round, wavy surface	Scoring, scuffing, haul-off overload
Cooling water	15 to 22	벽을 통해 열을 제거합니다.	Soft core, deformation at the cutter	Long tank required, slow line

Two rules of thumb keep a conduit line out of trouble. First, if the melt looks good but torque is high, reduce internal lubricant or lower the feed zone temperature before touching the metering zone, because the heat is being generated mechanically rather than by the heaters. Second, if the surface is dull and streaky and plate-out appears on the die land within an hour, the external lubricant is too high, and no temperature change will fix it.

품질 테스트ing Program for Finished Conduit

A conduit producer needs a test program that covers three layers: incoming compound control, in-process dimensional control, and finished-product type and batch testing. The first two protect output; the third protects the certificate. The table below sets out the finished-product program that a conduit plant should be able to run in its own laboratory, with the harder type tests sent to an accredited laboratory at defined intervals.

테스트	Method principle	Typical requirement	주파수	What a failure indicates
Compression resistance	Apply the class load to a 200 mm specimen between plates for 30 s	Deformation not more than 25 percent at 320 N, 750 N or 1250 N per declared class, with recovery on unloading	Every shift, per size	벽 두께 below target, filler overload, low resin K value
충격 저항성	Falling hammer of the class mass from the class height at -5 degrees Celsius	No crack or split in the required number of specimens	Every shift, per size	Impact modifier too low, over-filled compound, frozen-in stress from cold water
Bending test	Bend a specimen around a former of defined radius at ambient	No cracking, no collapse of the bore beyond the limit	Daily, per size	과도한 냉각, 불완전한 융합, 과도한 필러
Glow-wire flammability	Heated loop applied to the wall for 30 s	Self-extinguish within the declared time at 750 or 850 degrees Celsius, no ignition of tissue	Weekly and on every compound change	필러 또는 윤활제 과부하, 적절한 synergist 부족
불꽃 확산 불가	Vertical burner test on a 1 m length	Self-extinguish within 30 s, flame front below the mark	Type test and on formulation change	Thin wall, dripping compound, low LOI
비캇 연화 온도	Needle penetration of 1 mm under set load and heating rate	Commonly 90 degrees Celsius or higher for rigid conduit	Weekly	Impact modifier or plasticizing additive too high, low K value resin
Chemical resistance	Immersion in defined reagents, then inspection and property check	No swelling, cracking or significant mass change	Type test	Incompatible additive package, poor fusion allowing ingress
절연 저항	Direct voltage applied between an internal electrode and an external foil	Above the declared minimum, commonly 100 megohm class	Weekly	벽의 기공성, 혼합물에 수분, 오염
Dielectric withstand	Alternating voltage applied for a set time	No breakdown at the declared test voltage	Weekly	Wall voids, inclusions, thin spots
Dimensional check	Micrometer and go or no-go gauges on outside diameter, wall and ovality	표준 허용 범위 내에, 최소 벽은 명상 크기에서 허용치만큼 작아지지 않습니다.	Every 30 min per cavity	Die centering, vacuum trim, haul-off drift
Socket dimension and fit	Gauge the socket depth and bore, assemble with a spigot	Full insertion to the shoulder, no gap, no split	Every shift	Belling temperature, chill time, mandrel wear
Oven test for residual stress	시편을 뜨거운 공기 오븐에 넣고 탈각 여부를 검사합니다.	No blistering, splitting or layer separation	Daily	Poor fusion, frozen stress, over-rapid cooling

The compression and impact pair should be treated as the daily heartbeat of the plant. They are quick, they are directly linked to the class the product is sold as, and between them they detect almost every drift in wall thickness, compound composition and cooling that matters. Everything else in the table exists to catch slower or rarer failures.

Common Defects and 시정 조치s

Rigid PVC conduit defects follow a predictable catalog, and almost all of them trace back to one of four root causes: thermal history, lubricant balance, cooling rate or die geometry. The table below is arranged so an operator can move from symptom to action without a diagnostic detour.

결함	Appearance	Probable root causes	Corrective actions in order
Burn marks and black specks	Brown or black streaks and discrete specks in the wall, often intermittent	Dead spots in the flow channel, excessive screw speed, stabilizer under-dosed, metering zone too hot, worn screw flights	Reduce screw speed and re-balance feeder ratio; lower metering and adapter set points by 3 to 5 degrees Celsius; raise stabilizer by 0.3 to 0.5 phr; strip and polish the die flow channel; inspect screw flight clearance
Surface pitting and pinholes	Fine matte pockmarks on the outer surface	Moisture or volatiles not removed, vacuum vent flooded or leaking, blend not matured, filler moisture	Check vent vacuum and decompression zone; reduce feeder ratio slightly to unflood the vent; verify silo maturation time; check filler storage against moisture pickup
오목도가 허용치 밖입니다.	Diameter differs between measuring axes beyond the allowance	Vacuum too low, calibration sleeve worn or misaligned, support rollers in the cooling tank set wrong, haul-off pads too hard	진공을 0.005 MPa 단위로 상승시키고, 슬리브 구멍의 마모 및 동심도를 확인하며, 탱크 지지 롤러를 다이 축에 다시 정렬하고, 더 부드러운 또는 프로파일링된 하우오프 패드를 장착하십시오.
둘레 주변의 벽 두께 편차	Thick on one side, thin on the opposite side	Die ring off-center relative to the mandrel, uneven die body heating, sagging of the melt before calibration	Re-center the die ring with the adjusting bolts, quarter by quarter; check every die heater band for a failed element; reduce the die-to-tank gap; lower die land temperature slightly to raise melt strength
벽 두께 oscillation along the length	Slow periodic thick and thin bands	Feeder bridging or pulsing, haul-off speed ripple, screw speed hunting, blend flow variability	Check the feeder auger and hopper level control; verify haul-off drive encoder feedback; tighten the screw speed control loop; measure dry blend flow time and bulk density
Brittle fracture in the impact test	Clean split with little deformation, especially at -5 degrees Celsius	Impact modifier under-dosed, filler overloaded, poor fusion, over-rapid quenching	Raise impact modifier by 1 to 2 phr; cut calcium carbonate by an equal amount; raise die and metering temperature to improve fusion; raise cooling water to the upper end of the window
Longitudinal split at the weld line	Crack along one or more axial lines, usually revealed during belling	융해 온도 too low at the mandrel support, insufficient die land compression ratio, contaminated or oxidized melt at the split	Raise die body temperature by 3 to 5 degrees Celsius; verify die pressure is inside the 12 to 22 MPa band; increase land length or compression ratio at the next tooling revision; check the spider or basket support for build-up
색상 변화 between cavities	One strand consistently different in shade from the others	Manifold thermal imbalance, unequal residence time, one branch restricted by build-up	Compare zone temperatures branch by branch; trim the restrictor on the fast branch; strip and clean the affected branch; verify heater band contact on the die body
둔한, 얼룩진 표면과 판형	매트한 마감, 한 시간 동안 작동한 후 다이 랜드에 흰색 침전물	External lubricant too high, stabilizer over-dosed, filler surface treatment incompatible	Reduce external lubricant by 0.1 to 0.2 phr steps; recheck stabilizer dosage; trial an alternative filler surface treatment; clean the die land and observe the rebuild rate
Socket cracking at belling	Split radiating from the socket mouth after expansion	Heating too short or surface-only, weld line weakness, impact modifier too low, chill time too short	Extend the heating dwell and lower oven temperature for a more even profile; address the die weld line cause; raise impact modifier; extend the mandrel chill time before ejection
Bowing and length instability	Conduit curves after cutting or shortens on storage	Frozen-in stress from over-rapid cooling, asymmetric cooling in the tank, insufficient total cooling length	Raise cooling water temperature; verify all spray nozzles are open and evenly distributed; add cooling tank length before increasing line speed
Unfused specks and fish-eyes	Small hard translucent inclusions in the wall	Mixer discharge too hot causing pre-gelation, resin lot with high fish-eye count, insufficient processing aid, metering zone too cold	Lower hot mixer discharge below 120 degrees Celsius; check the incoming resin fish-eye result; raise acrylic processing aid by 0.3 to 0.5 phr; raise metering zone temperature

Faygo Conduit 압출 라인 구성s and 사양s

Faygo builds pipe extrusion platforms covering 12 to 575 millimeters in diameter and wall thicknesses up to 6.5 millimeters, in PE, PP and PVC, from three specialized factories with FAYGOPLAST as the pipe, profile and sheet extrusion base. For flame retardant electrical conduit, three of the Faygo production line families cover essentially the entire product matrix a building wiring producer needs, and the sections below give the configuration and specification set for each.

Faygo PVC 더블 파이프 압출 라인

Faygo PVC 파이프 생산 라인

Faygo PE, PP and PVC 단벽 골판지 파이프 압출 라인

All three Faygo lines share the same engineering foundation: an intelligent control system that allows every process parameter to be set and trimmed in real time, internationally recognized brand electrical components in the control cabinet, and a 72시간 연속 작동 test before delivery. That last item is the one that matters most to a first-time buyer, because it means the line has already been proven to hold its parameters over three full days before it is packed.

화재 방지 PVC 배관의 적용 분야

화재 retardant PVC 콘두트는 거의 모든 종류의 건물에서 사용되는 몇 가지 제품 중 하나이지만, 부문별로 사양이 크게 달라지며 이러한 차이를 이해하는 제조업체는 단일 일반 콘두트를 판매하는 제조업자보다 훨씬 더 정확하게 제품 범위를 포지셔닝할 수 있습니다.

Residential and commercial building wiring is the volume base. Concealed conduit in floor slabs, walls and ceilings, running from distribution boards to socket outlets, lighting points and switch positions, dominates by meterage. The dominant sizes are dn16, dn20 and dn25, in light and medium compression classes, in white or light gray. Volume here rewards a four-cavity line with automatic bundling, because the product is a commodity and the cost per meter is set by line efficiency rather than by any technical differentiator.

Industrial plants and workshops사양을 상향 조정합니다. 구조 강철 및 블록 벽에 설치된 표면 장착 배관은 취급 장비, 세척, 오일 및 용제, 그리고 더 넓은 온도 변화에 노출되므로 높은 압축 등급, 높은 충격 등급 및 선언된 낮은 온도 한계가 일반적입니다. 크기는 dn20에서 dn50까지 다양하며, 주황색 또는 회색 색상이 종종 지정되어 전기 서비스가 공정 배관과 시각적으로 구별됩니다.

Municipal works and utility corridors건물 콘duit 대신 PVC 덕트를 사용하며, dn63에서 dn200까지의 두께, 직접 매설 또는 콘크리트에 감싸서 거리 조명 회로, 교통 신호 케이블 및 배전 공급선을 보호합니다. 이것은 Faygo PVC 파이프 생산 라인의 자연스러운 적용이며, 일반적으로 굴착기에게 경고하기 위해 특정 색상 규칙을 따릅니다.

Data centers and structured cabling다시 다른 것을 요구합니다. 여기에서는 파이버 및 구리 백본을 방호하기 위해 콘두트가 자주 사용되며, 사양은 압축 저항에서 화재 특성, 연기의 발생 및 긴 케이블을 뽑을 때 손상을 방지하는 깨끗한 구멍으로 이동합니다. 가장 halogen-free 저연소성 제품을 요구할 가능성이 높은 분야이며, 내부 표면 품질이 일관되면 상업적 가치가 있습니다. 이는 케이블 재킷이 뽑는 동안 손상되는 경우에 발생합니다.

Prefabricated and modular construction가장 빠르게 변화하는 분야입니다. 콘두트는 현장에서 고정되는 것이 아니라 공장에서 사전 제작된 벽 및 바닥 패널에 주입됩니다. 이는 콘두트가 콘크리트의 진동 압축에 견딜 수 있어야 하고 패널 가장자리와 정확한 위치에서 고정되어야 하며, 길이를 맞춰서 제공되어야 한다는 것을 의미합니다. 이 시장을 서비스하는 제조업체는 추가 생산량보다 안정적인 고정 길이 절단 및 벨링을 필요로 하며, 이는 패널 공장이 구매하는 것이 바로 치수 일관성입니다.

Agricultural and outbuilding installations나머지 범위를 구성합니다. 콘두트는 자외선에 노출되고 광범위한 온도 변화에 노출되어 티타늄 디옥시드 함량을 높이고 종종 부타디엔 함유 유형에서 아크릴 유형으로 영향을 미치는 성분으로 이동합니다. 이는 더 나은 기후 안정성을 위해 화재를 방지하는 데 도움이 됩니다. 이 시장을 서비스하는 제조업체는 추가 생산량보다 안정적인 고정 길이 절단 및 벨링을 필요로 하며, 이는 패널 공장이 구매하는 것이 바로 치수 일관성입니다.

Line 선택 가이드: From Requirement to 구성

The selection logic for a conduit line is simple once the product matrix is fixed: the largest diameter and heaviest wall in the range determines the extruder and die size, the smallest diameter and highest volume determines the cavity count, and the annual tonnage determines whether one line or two makes sense. The table below maps common requirement profiles to Faygo configurations.

Requirement profile	직경 범위	압축 등급	목표 출력	추천되는 Faygo 라인	압출기 클래스	Die cavities	Key downstream additions
Start-up producer, residential conduit only	dn16 to dn25	Light 320 N and medium 750 N	120 ~ 180 kg / h	PVC 이중 파이프 압출 라인, 16-40 build	SJZ 51 / 105	2, upgradeable to 4	Chipless cutter, manual bundling, single-station belling
Volume commodity producer, small conduit	dn16 to dn25	Light 320 N and medium 750 N	200 ~ 250 kg/h	PVC 이중 파이프 압출 라인, 16-40 build	SJZ 55/110	4	Planetary saw, automatic stacker and bundler, twin-station belling
Full building range producer	dn16 to dn50	Light through heavy 1250 N	250 ~ 350 kg/h	PVC 이중 파이프 압출 라인, 16-63 build	SJZ 65/132	4 for dn16 to dn25, 2 for dn32 to dn50	Full tooling set per size and class, ultrasonic wall gauge, automatic bundler
산업 및 노출된 콘두트 전문업체	dn20 to dn50	Heavy 1250 N, impact class medium to heavy	220 to 320 kg/h	PVC 이중 파이프 압출 라인, 16-63 build	SJZ 65/132	2	Extended cooling tank, low-temperature impact test rig, hot foil printer
Municipal cable duct producer	dn63 to dn160	Heavy 1250 N and very heavy 4000 N	400 to 550 kg/h	PVC 파이프 생산 라인, 50-160 build	SJZ 80/156	1	Extended vacuum and spray tanks, four-track haul-off, single-station belling
Large duct and encased conduit producer	dn110 to dn315	매우 무거움 4000 N	600 to 800 kg/h	PVC 파이프 생산 라인, 110-315 build	SJZ 92/188	1	Auxiliary vacuum tank, heavy-duty planetary saw, tilting discharge table
Flexible conduit producer	16 to 50 mm corrugated	Pliable, self-recovering classes	100 to 150 kg/h	단벽 골판지 파이프 압출 라인, 6-50 build	Single-screw or conical twin-screw	Corrugator, not a cavity die	Automatic coiler, meter counter, pre-wiring option
Combined rigid and flexible plant	dn16 to dn50 rigid plus 16 to 50 corrugated	Full building range	350 to 400 kg/h combined	PVC Double Pipe Line plus Single Wall Corrugated Line	SJZ 65/132 plus corrugated line extruder	4 plus corrugator	Shared mixing plant, shared chiller, shared laboratory

Two selection mistakes recur often enough to be worth naming. The first is buying the extruder for the average product and discovering it cannot make the heaviest wall in the range at acceptable speed; the correct rule is to size the extruder on the heaviest wall and largest diameter, then use cavity count to recover efficiency at the small sizes. 두 번째는 under-buying tooling. A producer offering three diameters in three compression classes needs nine wall schedules, and while the die body is shared, the mandrel, die ring and calibration sleeve set is not. Budget the tooling matrix at the same time as the machine.

Utilities, Workshop Layout and Corrosion Protection

A conduit line is only as good as the workshop around it, and PVC adds one requirement that no polyolefin line has: active management of hydrogen chloride. Utility planning should therefore be treated as part of the machine specification, not as a site problem to be solved later. Faygo provides water and electricity design and 3D workshop layout as part of its factory consulting service, which is the fastest way to avoid the classic mistakes of an undersized chiller or a workshop bay too short for the full train.

Utility or facility item	Small conduit line, dn16 to dn40	Full range line, dn16 to dn63	Duct line, dn110 to dn315	주석
Installed electrical power	70 to 95 kW	110 to 140 kW	210 to 265 kW	Includes extruder, heaters, vacuum pumps, haul-off, cutter, belling
Average running power	설치된 기계의 약 55~65%	설치된 기계의 약 55~65%	설치된 설비의 약 60~70%에 해당합니다.	라인이 열적으로 안정될 때 히터가 작동 중지됩니다.
특정 에너지 consumption	0.32 to 0.42 kWh/kg	0.30 to 0.40 kWh/kg	0.28 to 0.38 kWh/kg	더 큰 섹션은 킬로그램당 더 많은 에너지를 소비합니다.
냉각수 흐름	6 to 10 m3/h	10 to 16 m3/h	18 to 28 m3/h	Closed loop through a chiller with a buffer tank
Chiller capacity	15 to 25 kW cooling duty	25 to 40 kW cooling duty	45 to 75 kW cooling duty	Size on peak output, not average, and allow for summer ambient
Compressed air	0.4 to 0.8 m3/min at 0.6 MPa	0.6 MPa에서 0.6 ~ 1.0 m3/min	1.0 to 1.6 m3/min at 0.6 MPa	Cutter clamping, printer, bundling station
Workshop bay length	28 to 34 m	34 to 42 m	45 to 55 m	압출기, 탱크, 운반, 절단기, 롤아웃 테이블, 벨링을 포함합니다.
Workshop bay width	6 to 7 m	7 to 8 m	8 to 10 m	Allow a clear side aisle for screw withdrawal
Clear height	5 m minimum	5 m minimum	6 m minimum	Overhead crane access to the die head and screws
Fume extraction	Hood over die head and vacuum pump exhaust	Hood over die head and vacuum pump exhaust	Hood plus general bay extraction	Route the vacuum exhaust outside the building
Operators per shift	2	2 to 3	3	Includes bundling and quality checks

Corrosion protection deserves its own paragraph because it is where a PVC workshop quietly degrades over years. Hydrogen chloride evolved at the die and drawn off by the vacuum pump condenses with water vapor into hydrochloric acid on cold steel surfaces. Three measures address it. First, capture the source: a hood over the die head area with dedicated extraction, and the vacuum pump exhaust piped to the outside rather than vented into the bay. Second, protect the metal: epoxy or polyurethane coating on machine frames, tanks and structural steel near the die, stainless or coated fasteners, and enclosed control cabinets with positive-pressure filtered ventilation so the cabinet interior never sees the workshop atmosphere. Third, control condensation: keep the bay adequately ventilated and avoid cold uninsulated surfaces immediately downstream of the die.

Energy is the other long-run cost driver worth designing for. A conduit line spends most of its electricity in three places: the main extruder drive, the barrel and die heaters, and the chiller. The drive load is fixed by the physics of the compound, but heater load can be cut substantially with ceramic insulating jackets on the barrel and die head, which typically reduce heater duty by a meaningful fraction once the line is at steady state, and the chiller load can be reduced by using a dry cooler or free-cooling loop when ambient temperature allows rather than running mechanical refrigeration all year.

Service, Commissioning and Long-Term Support

The difference between a conduit line that reaches nameplate output in a month and one that never quite gets there is almost entirely a service question, not a hardware question. Faygo builds its support around end-to-end responsibility from selection through to steady production, and the elements below are the ones a buyer should confirm in writing on any conduit project, whoever supplies it.

Formulation and process development before the machine is built. Conduit is a compound-driven product, and a line specified without reference to the actual recipe will be mis-tooled. Faygo works through the formula and process window with the customer as part of the turnkey package, so the die land geometry, the calibration sleeve shrinkage allowance and the cooling tank length are matched to the compound that will actually run, not to a generic assumption.

실제 재료를 사용하여 시험 생산을 실시합니다. Every Faygo line goes through a 72시간 연속 작동 test before delivery. Where the customer supplies resin and additive package, the trial can be run on the customer’s own compound so that the sleeve allowance, the die ring setting and the temperature profile are established in Zhangjiagang rather than discovered on site. The output from that trial can be dimensionally checked and flame tested before the line is packed.

설치 및 시운전 on site. Faygo engineers travel to the plant, supervise mechanical installation and utility connection, commission the line, and stay through the first production runs. Commissioning includes establishing the process card for each size and class in the customer’s product matrix, not just proving that the machine runs.

Spare parts policy. The Wanplas brand-level commitment of USD 500 free parts every year applies across all its factories including Faygo, alongside free replacement of parts that fail within the warranty period. Beyond the free allocation, the parts that matter on a conduit line and their realistic service intervals are set out below.

Wear part	기능	Typical service life	Failure symptom	Stocking advice
Conical twin screws, bimetallic	Convey, fuse and pressurize the dry blend	18,000 to 30,000 operating hours depending on filler loading	Output drop at constant speed, torque instability, surging	비행 간격을 매년 측정하고, 간격이 두 배가 될 때까지 교체 가능한 쌍을 주문하십시오.
Barrel liner, bimetallic	Contains and heats the melt	25,000 to 40,000 operating hours	Output loss that a new screw does not restore	Replace together with a screw set at the second screw change
Die head mandrel and die ring	Form the annular section, set wall distribution	3 to 6 years with routine polishing	Persistent surface streaking, wall distribution that will not center	Keep one spare land insert per high-volume size
교정 슬리브s	Set outside diameter and roundness	2 to 4 years per size	Undersize conduit, scoring, ovality drift	Keep a spare sleeve for every size in weekly production
Haul-off caterpillar pads	Grip and pull the conduit at set speed	12 to 24 months	Slipping, denting, speed error against the encoder	절대 개별적으로 교체하지 마십시오.
Cutter blade or saw blade	Fixed-length cutting	Chipless blade 3 to 6 months, saw blade 2 to 4 months	버링, 거친 절단, 길이 분산	Two spares in stock at all times
Belling mandrels	Form the socket profile	2 to 5 years per size	Socket dimension drift, sticking on ejection	대량 생산되는 크기마다 하나씩의 예비 부품을 보유하십시오.
Vacuum pump seals and filters	Maintain calibration vacuum	6 to 12 months	Slow vacuum recovery, ovality drift	Keep a full service kit on the shelf
Heater bands and thermocouples	Zone temperature control	2 to 4 years	Zone that will not reach set point, temperature oscillation	One spare band per zone type

작업자 교육 Faygo provides worker configuration and training as a named consulting service. For a conduit plant the training program should cover mixing discipline and dosing sequence, extruder start-up and controlled shutdown for a heat-sensitive polymer, die ring centering technique, vacuum and cooling trim, the daily compression and impact test routine, and the defect diagnosis logic in this article. A crew that can center a die ring in ten minutes rather than an hour is worth more than a percentage point of extruder efficiency.

원격 및 지속적인 지원지능형 제어 시스템은 원격 진단을 지원하며, Faygo는 24/7 온라인 기술 지원을 제공하여 공정 문제가 발생할 경우 엔지니어와 실시간으로 협력할 수 있도록 합니다. Wanplas 브랜드 전반에 걸쳐 공유되는 개방형 공장 정책으로 인해 고객은 장지강 공장을 방문하여 비교 가능한 라인을 실행하고, 구축 및 72시간 시험 중에 자체 기계를 검사할 수 있습니다.

Plant-level services. Beyond the single line, Faygo offers water and electricity design, 3D factory site layout, new factory construction from zero, old machine replacement with zero downtime, and capacity expansion focused on removing existing bottlenecks. For a conduit producer whose belling or bundling station is throttling an otherwise capable extrusion line, the bottleneck analysis alone often frees up more output than a new machine would.

자주 묻는 질문

Why is a conical twin-screw extruder preferred over a single-screw machine for PVC electrical conduit?

강성 PVC 케이블은 건조 혼합 분말로 만들어지며, 원심형 이중 스크류 압출기는 용기 벽과의 마찰에 의존하지 않고 상호 교차하는 대칭 회전 스크류를 통해 단백질을 긍정적으로 전달합니다. 이는 피드 변동에 따른 안정적인 출력을 제공하고, 킬로그램 당 훨씬 적은 세리 열을 생성하며, 부드러운 예열 및 효과적인 진공 배풍을 위한 큰 피드 엔드 표면을 제공합니다. 단일 스크류 기계는 화합물을 먼저 펠let으로 만들 필요가 있어 열에 민감한 단백질이 필요하지 않은 완전한 열 역사를 추가하며 여전히 좁은 안정적인 작동 창을 제공합니다.

What flame tests does a building electrical conduit actually have to pass?

The two that appear in nearly every specification are the glow-wire test, at 750 or 850 degrees Celsius depending on the declared class, and the non-flame-propagating test where a vertically mounted specimen must self-extinguish within 30 seconds after the burner is removed. Producers usually add limiting oxygen index as an internal control, targeting 32 percent or higher on finished tube, because it is fast and correlates well with the standardized tests. Where a project specifies halogen-free performance, additional acid gas and smoke density measurements apply and the compound must move away from PVC entirely.

How many die cavities should a conduit line have?

Cavity count is chosen so that line speed stays inside what the cooling train and the cutter can support. For dn16 to dn25, four cavities is the normal choice on a volume line because a single strand at that cross-section would need an unrealistic haul-off speed to absorb the extruder output. From dn32 to dn50, two cavities is typical. Above dn50, single cavity is standard because the section is large enough to consume the full extruder output at a sensible speed and because manifold balance becomes harder as flow volume rises.

How do I choose between light, medium and heavy duty classes?

The class is defined by the compression test load, 320 N for light, 750 N for medium and 1250 N for heavy, each with a deformation limit of 25 percent. Light class suits surface-mounted conduit in protected indoor locations. Medium class is the general default for concealed work in walls and ceilings. Heavy class is specified for conduit in floor screed, in slabs subject to traffic loads, and in industrial floors. Moving up a class is mostly a wall thickness and compound stiffness decision, which means a new calibration sleeve and die tooling combination and a lower line speed at the same extruder output.

What causes conduit to split when it is belled?

The most common cause is a weak weld line formed in the die head where the melt split around the mandrel support did not fully heal, which points to die body temperature too low, die pressure below the working band, or insufficient land compression ratio. The second most common cause is a belling heating cycle that softened only the surface, so the outer layer stretched while the core resisted. The third is an impact modifier loading too low for the wall thickness and the ambient temperature at belling. Diagnose in that order, because the die cause will also show up as reduced impact performance on the tube itself.

Can the same line make electrical conduit and small pressure pipe?

Yes, and many producers do. The extruder, vacuum tank, cooling tank, haul-off and cutter are common. What changes is the die head and calibration sleeve set, because pressure pipe wall schedules differ from conduit schedules; the compound, because pressure pipe recipes carry less filler and a different stabilizer balance; and the belling tooling, because a pressure pipe socket carries a sealing ring groove while a conduit socket is a plain push-fit expansion. Plan a changeover as a two to four hour job and group production so it does not happen daily.

수소 염화물 부식은 PVC 배관 라인에서 어떻게 제어됩니까?

압출기 수준에서, 이중 금속 나사와 배럴 라이너, 크롬 도금된 나사 샤프트 및 압출기 머리 영역에 설치된 캡처 후드, 진공 펌프 배기관이 건물을 벗어나도록 연결되고, 프레임과 구조 강철에 보호 코팅을 적용하여 산을 취약한 금속 및 전자 장비에서 멀리 유지합니다. 먼저 안정제 용량을 적절하게 조절하고 온도 조절을 통해 악화를 방지하는 것이 가장 저렴한 방지 방법입니다.

새로운 콘두트 라인을 가동하는 데 얼마나 오래 걸립니까?

준비된 작업장과 유틸리티가 설치되어 있고 숙련된 작업 인력이 판매 가능한, 허용 오차 범위 내의 출력을 달성하는 데 일반적으로 72시간 연속 가동 테스트를 공장에서 수행하고, 가능한 경우 고객의 자체 화합물에서 시제품 생산을 실시하여 슬리브 수축 허용치와 온도 프로필이 이미 설정되어 있을 때 라인이 도착합니다. 프로세스 카드를 모든 크기 및 클래스에 대해 작성하는 것이 일반적으로 첫 몇 주 동안의 일정입니다.

What does Faygo supply beyond the machine itself?

Faygo supplies customized turnkey solutions covering selection, design, manufacturing, installation, commissioning, training and maintenance, plus factory-level consulting: water and electricity design, 3D workshop layout, worker configuration and training, complete new factory construction, old machine replacement with zero downtime, and capacity expansion targeted at existing bottlenecks. On the after-sales side, the Wanplas commitment of USD 500 free parts every year, warranty replacement of failed parts, 24/7 online technical support and an open factory policy apply to every line.

결론 및 다음 단계

A flame retardant PVC electrical conduit extrusion line looks like a simple product family until you look closely, and then it turns into a tightly coupled system where the compound recipe, the mixing cycle, the extruder geometry, the cavity count, the calibration allowance, the cooling length and the belling cycle all have to agree with one another. Get one of them wrong and the symptom appears somewhere else entirely: over-filled compound shows up as a glow-wire failure, an unbalanced manifold shows up as color variation, over-rapid cooling shows up as socket cracking two stations downstream. The engineering value in a conduit line is not in any single machine but in the coherence of the whole train.

The decisions that matter most, in order, are these. Fix the product matrix first — diameters, compression classes, whether halogen-free is required — because it determines everything downstream. Size the extruder on the heaviest wall and largest diameter in that matrix, then recover small-size efficiency through cavity count rather than through line speed. Specify bimetallic screws and barrel and a chrome-plated die channel as a baseline, not as an upgrade, because hydrogen chloride does not negotiate. Budget the tooling matrix at the same time as the machine. Size the belling and bundling stations against peak line output rather than average. And build the daily compression and impact test into the production routine from day one, because those two tests catch almost every drift that matters.

Faygo, Wanplas 공장 with 22 years of specialization in plastic pipe and profile extrusion, three factories, 13 national patents including 8 invention patents and CE and ISO certification across the product range, builds these lines as complete systems: PVC 이중 파이프 압출 라인s for building conduit from 16 to 63 millimeters, PVC 파이프 생산 라인s for heavy duct up to 315 millimeters, and 단벽 골판지 파이프 압출 라인s for pliable conduit from 6 to 200 millimeters, all backed by a 72시간 연속 작동 test before shipment and end-to-end service afterwards.

If you are planning a conduit line or expanding an existing one, the most useful next step is to send your product matrix: the diameter range, the compression and impact classes you intend to declare, the standard you will certify to, whether sockets are required, and your target annual tonnage. With those five inputs Faygo can return a specific line configuration with extruder class, cavity count, tooling schedule, utility requirements and workshop layout. If you already have a compound you want to run, send it and Faygo will trial it on a comparable line and report the dimensional and flame test results before you commit to anything. And if you would rather see it for yourself, the factory in Zhangjiagang is open to visitors and is two hours from Shanghai Airport — come and watch a conduit line run, inspect the screw and die construction, and talk through the configuration with the engineers who build it.