Indice dei contenuti
- 1. Urban Flood Control and Deep Tunnel Drainage: The Pipe Demand Background
- 2. Structure and Principle of the HDPE Hollow Wall Winding Pipe
- 3. Linea di produzione Equipment Composition and Commissioning Points
- 4. Material System and Compounding for Large-Diameter HDPE Pipes
- 5. Standards and Acceptance Specification
- 6. Engineering Application and Buried Installation
- 7. Special Challenges of Super-Large Diameter and Countermeasures
- 8. Faygo Real Machine Modules for Hollow Wall Winding Pipe Production
- 9. Requirement to Consigli per la selezione del modello
- 10. Common Quality Defects and Countermeasures
- 11. Service Support and How to Start Your Project
- 12. Domande frequenti
1. Urban Flood Control and Deep Tunnel Drainage: The Pipe Demand Background
Extreme rainfall events are becoming more frequent and more intense across densely populated metropolitan regions, and the resulting urban flooding has turned municipal drainage from a background utility into a front-line infrastructure priority. When a storm drops two hundred millimeters of rain inside a few hours, conventional gravity sewers sized for a ten-year return period simply cannot move the volume, and streets, subways, and basements fill with water. The engineering response that planners now favor is a two-tier system: a normal near-surface drainage network for routine flow, plus a deep storage and transfer tunnel bored far below the city to absorb the peak and release it slowly after the event. A super large HDPE hollow wall winding pipe production machine exists to manufacture the pipe that makes this second tier physically possible.
The deep tunnel concept changes every design parameter of the pipe. Instead of placing a pipe two or three meters below the road, engineers now thread a tunnel thirty to sixty meters down, where geology is stable and surface disruption is minimal. At that depth the pipe must carry enormous static earth and water loads, survive long-term external pressure without buckling, resist aggressive sewage chemistry, and remain serviceable for half a century with essentially no access for repair. The diameter requirement also expands dramatically. Where a typical municipal trunk line might be DN600, a deep drainage main frequently runs from DN800 up to DN3000 and beyond. These are not conventional extruded solid-wall pipes; they are structured-wall pipes where the wall is engineered as a hollow cavity to maximize stiffness per unit of material.
Long-term external stability is the decisive property. A pipe buried at forty meters depth carries a soil column plus groundwater head that can exceed three hundred kilopascals of sustained external pressure. A solid-wall pipe sized to resist that load would need a wall so thick that material cost and weight become impractical. The hollow wall winding concept solves this by placing the structural material where it contributes most to the section’s second moment of area, achieving high ring stiffness at a fraction of the mass. This is why hollow wall winding technology, rather than solid-wall extrusion, is the natural choice for super-large flood-control and deep-tunnel pipe.
Corrosion resistance is the second decisive property. Drainage and storage tunnel water is not clean. It ranges from mildly alkaline to acidic, carries suspended grit, and in combined systems can swing between pH 2 and pH 12 depending on industrial discharge and rainfall dilution. A steel or concrete pipe faces progressive degradation in that environment; an HDPE structured-wall pipe is chemically inert across the full pH range and does not support microbiological corrosion. The design life target of fifty years is therefore realistic rather than optimistic.
Installation method adds a final constraint. Deep tunnels are almost always installed by trenchless methods such as pipe jacking or segmental lining, while shallower trunk sewers may be laid in open cut. Both methods favor pipe that is light enough to handle, stiff enough to be pushed or pulled through ground without ovalizing, and jointed with a seal that survives ground movement. Hollow wall winding pipe meets all three because the low mass comes from the hollow structure, the high stiffness comes from the engineered wall, and the joints are made by electrofusion or heat-shrink collars that create a continuous, flexible, watertight connection.
Faygo, a Wanplas factory with 22 years of dedicated experience in plastic pipe and profile extrusion, builds the production machinery that manufactures these pipes. Operating three specialized factories and holding 13 national patents, Faygo supplies the complete extrusion and winding line that turns HDPE resin into DN800 to DN3000 structured-wall pipe rated for the most demanding municipal flood-control duties.
2. Structure and Principle of the HDPE Hollow Wall Winding Pipe
Il tubo a strato vuoto è un tubo a strato strutturato in cui la carico strutturale è sostenuta da un profilo vuoto che è spiralmente avvolto attorno all'asse del tubo, anziché da una parete solida uniforme. Comprendere come questa struttura si confronta con le alternative è la base per la specificazione della macchina di produzione giusta.
2.1 Comparison With Other Pipe Structures
Four structured-wall concepts dominate the large-diameter drainage market: the solid-wall pipe, the double-wall corrugated pipe, the steel-reinforced polyethylene pipe, and the hollow wall winding pipe. Each trades material efficiency, maximum achievable diameter, joint method, and cost differently. The table below compares them on the dimensions that matter for flood-control and deep-tunnel service.
| Structure Type | Ring Stiffness Efficiency (SN per unit mass) | Maximum Diameter | Typical Joint Method | Relative Cost Level |
|---|---|---|---|---|
| Solid-wall PE pipe | Low | DN1200 typical, limited beyond | Butt fusion / electrofusion | Medium |
| Double-wall corrugated pipe | Medium | DN300 to DN1200 | Integrated socket / rubber ring | Medium |
| Steel-reinforced PE pipe | Alto | DN800 to DN2600 | Electrofusion / collar | Alto |
| Hollow wall winding pipe | Very High | DN800 to DN3000 and above | Electrofusion tape / heat-shrink / steel clamp | Medium to High |
The ring stiffness efficiency metric shown in the first column is the ratio of achieved ring stiffness to the mass of polymer used. Hollow wall winding pipe leads this metric because its cavity profile places material far from the neutral axis, where it most increases the second moment of area. That is precisely why it can reach DN3000 with practical wall mass, while a solid-wall pipe of equal stiffness would be prohibitively heavy.
2.2 The Winding Formation Principle
The defining process of this pipe is helical winding on a rotating mandrel. Molten HDPE is formed into a shaped hollow profile strip, sometimes called a profile or structural strip, in a dedicated profile die. This strip has a precise cross-section with one or more internal cavities. The strip is then delivered to a rotating mandrel, a large-diameter cylindrical forming drum, where it is laid down in a continuous helix. As each new turn of the strip is placed against the previous turn, the adjacent strip edges are fused together by a hot-melt welding unit so that the helix becomes a single monolithic wall. The cavities created between successive turns form the hollow structural wall.
Two layers are typically built. An inner liner, often a flat or lightly profiled strip, forms the smooth interior flow surface. Over or around this liner, the hollow structural profile is wound to create the load-bearing wall. Some designs add an outer protective strip or capping strip that seals the cavity edges and gives the outside a finished appearance. The key physical principle is that the strip is plastic and hot at the moment of contact, so the welding pressure and temperature cause the two strip edges to coalesce into one homogeneous wall with no weak seam.
Because the structure is built by winding rather than by extruding a complete pipe through a die, the achievable diameter is limited only by the size of the mandrel and the floor space of the line, not by die-tooling limits. This is the core reason hollow wall winding technology reaches DN3000 where extruded solid-wall tooling cannot.
2.3 Ring Stiffness Grades and Cavity Geometry
Ring stiffness is the resistance of a pipe to deformation under uniform external load, expressed in kilonewtons per square meter (kN/m²). For structured-wall pipes the standard grades are SN2, SN4, SN8, SN12.5, and SN16. A higher number means a stiffer pipe that deflects less under the same buried load, allowing it to be used at greater depth or under heavier fill.
Ring stiffness is controlled in a winding line by three geometric levers. The first is the height of the structural wall: a taller profile places material farther from the neutral axis and raises stiffness. The second is the cavity shape. Rectangular cavities are simple to tool and give predictable stiffness; trapezoidal cavities improve bridging between turns and resist local collapse; circular cavities offer the best hoop stress distribution but are harder to seal at the weld. The third lever is the number of cavities and the strip thickness. The table below maps typical cavity choices to stiffness grades.
| Ring Stiffness Grade | Typical Wall Height Range | Preferred Cavity Shape | Typical Buried Depth (compacted backfill) |
|---|---|---|---|
| SN2 | Low | Rectangular | Shallow, low cover |
| SN4 | Low to medium | Rectangular / trapezoidal | Shallow to medium |
| SN8 | Medium | Trapezoidal | Medium depth trunk sewer |
| SN12.5 | Medium to high | Trapezoidal / circular | Deep burial, heavy traffic |
| SN16 | Alto | Circular / composite cavity | Deep tunnel, high external load |
2.4 The Engineering Relation Between Inertia and Ring Stiffness
Ring stiffness is not an arbitrary label; it is rooted in the structural mechanics of a ring under radial load. In simplified form, the ring stiffness of a pipe relates to the product of the material’s flexural modulus and the second moment of area of the wall cross-section, divided by the cube of the diameter. Expressed in words rather than symbols, the stiffness grows in direct proportion to the material modulus and to the inertia of the wall, and it falls rapidly as the cube of the diameter increases. This is why diameter is such a dominant factor: doubling the diameter reduces the natural ring stiffness by roughly a factor of eight, unless the wall’s second moment of area is increased to compensate.
The hollow wall design is essentially an optimization of that second moment of area. By moving polymer into cavity walls positioned far from the pipe centerline, the winding structure achieves a much larger inertia for the same mass than a solid wall could. The production machine’s job is to reproduce that optimized geometry turn after turn, with consistent cavity shape and a weld strong enough that the structure behaves as one continuous ring. If the weld is weak, the section loses its continuity and the effective inertia collapses, so the welding unit is as important to final ring stiffness as the profile die itself.
3. Linea di produzione Equipment Composition and Commissioning Points
A super large hollow wall winding pipe production line is a sequence of synchronized stations, each with its own parameters and its own failure modes. The following sections walk through the main line segment by segment, giving the representative parameters and the commissioning points an engineer should watch.
3.1 Main Extruder
The main extruder melts and pumps the HDPE that forms the structural profile. For large-diameter hollow wall pipe, a single-screw extruder with a screw diameter from φ90 to φ150 mm is typical, with an L/D ratio of 33 to 36. The screw is an HDPE-specific barrier screw fitted with a mixing head that ensures uniform melt temperature and pressure before the material enters the profile die. Throughput scales with screw size: a φ120 mm machine delivers roughly 800 to 1500 kg/h, while a φ150 mm machine reaches up to 2000 kg/h.
Commissioning points: set the barrel temperature profile so the rear zones stay cool enough to build feed pressure and the front zones reach a uniform melt temperature around 200 to 220 degrees Celsius. Verify melt pressure stability; pressure swings translate directly into profile thickness variation. Check the barrier section is clean and the mixing head is free of carbon buildup before the first run.
3.2 Auxiliary Extruder
A secondary, smaller extruder supplies the inner liner layer and the hot-melt welding bead. Its output is a thinner, lower-viscosity stream that forms the smooth interior surface and the thin film that the welding unit fuses between adjacent profile turns. Using a separate extruder for the liner lets the line run a recycled or cost-optimized compound in the structural layer while keeping a clean virgin surface in contact with the flow.
Commissioning points: match the auxiliary extruder melt temperature to the main stream so the two bond without a cold interface. Confirm the liner thickness is uniform across the mandrel circumference; uneven liner causes interior surface defects that are hard to correct later.
3.3 Profile Die
The profile die shapes the molten HDPE into the hollow cavity strip. Its internal flow channel must be balanced so that every cavity of the profile fills completely and at equal pressure, otherwise one cavity walls is thin and the others thick. The die lips are adjustable to fine-tune the strip width and the cavity geometry after warm-up.
Commissioning points: after a full barrel warm-up, run a short scrap strip and measure the cavity dimensions against the drawing. Adjust the die lip bolts symmetrically. Confirm the strip exits straight without twist, because a twisted strip will not seat correctly on the mandrel.
3.4 Vacuum Sizing and Cooling of the Profile
Before the strip reaches the mandrel, it passes through a vacuum sizing and cooling section that locks its dimensions. The target dimensional stability for the profile is within plus or minus 0.2 mm. Tight control here is what makes the final pipe meet wall-height and cavity tolerances.
Punti di messa in servizio: regolate il livello di aspirazione e la temperatura dell'acqua di raffreddamento insieme. Un livello di aspirazione troppo alto distorce il profilo morbido; un livello troppo basso lo lascia rilassare fuori dalla tolleranza. Registrate la sezione trasversale della striscia al'inizio della linea, dopo un'ora e dopo che il cilindro raggiunge lo stato termico di equilibrio.
3.5 Rotating Winding Mandrel
Il mandrino di rullaggio è il cuore della linea. È un tamburo di grande diametro il cui diametro determina il diametro interno del tubo. Per questa applicazione il mandrino è variabile-diametro, copre il DN800 al DN3000 e gira lentamente a 0,5-5 rpm. La sincronizzazione tra la rotazione del mandrino, la velocità di alimentazione della striscia e il movimento del carro di saldatura è critica: se il mandrino gira troppo velocemente rispetto all'alimentazione della striscia, il passo si allunga e l'overlap della saldatura si riduce.
Commissioning points: verify the mandrel surface treatment gives easy demolding and that the variable-diameter mechanism holds concentricity across its full adjustment range. Check the rotation encoder against the carriage encoder so the pitch is consistent over the full pipe length. Inspect the surface for scoring that would mark the liner.
3.6 Winding Carriage and Pitch Control
The winding carriage carries the profile die and lays the strip onto the mandrel at a controlled pitch. The pitch must match the strip width so that each turn overlaps the previous turn by a defined amount. The overlap, or lap, is what the welding unit subsequently fuses; too little lap leaves a weak seam, too much lap wastes material and builds a bulged wall.
Commissioning points: set the pitch from the strip width minus the target lap. Run a calibration coil and cut a cross-section to measure the actual lap. Confirm the carriage tracks smoothly with no lateral oscillation that would vary the lap around the circumference.
3.7 Hot-Melt Welding Unit
As each strip turn is placed, the hot-melt welding unit fuses its edge to the preceding turn. The fusion temperature is typically 210 to 240 degrees Celsius, applied through a heated shoe or wheel with controlled pressure. The weld must reach at least 90 percent of the parent material strength so the wall behaves as one continuous ring.
Commissioning points: use an infrared pyrometer to verify the actual weld-zone temperature, not just the setpoint. Set the pressure wheel force so the melt squeezes into the joint without squeezing the cavity shut. Pull-test welded sample sections; a weld below 90 percent of parent strength is a line-stop condition.
3.8 Inner and Outer Shaping Rolls and Cooling
After winding, shaping rolls press the inner and outer surfaces to the correct contour while the polymer cools and sets the geometry. Internal air or water cooling stabilizes the wall before demolding.
Commissioning points: align the shaping rolls to the mandrel centerline. Watch for roll marks on the liner; a roll set too hard leaves a permanent impression. Monitor cooling so the pipe does not distort during the temperature transition.
3.9 Fixed-Length Cutting
A large-diameter planetary or traveling cutter severs the pipe at the required length. For DN2000 and above the pipe wall is thick and the cut must stay square; the acceptance target is a cut perpendicularity within one degree.
Commissioning points: confirm the cutter follows the pipe rotation so the blade traces a true circle. Check the cut face with a square gauge on the first pipe of each diameter change.
3.10 Demolding, Ejection, and Socket Forming
Once cooled, the pipe is stripped from the mandrel and moved to finishing. The ends are prepared for jointing. The connection methods compared for this pipe are electrofusion tape, heat-shrink collar, and steel clamp coupling. Electrofusion tape embeds a heating wire that melts the socket interface; heat-shrink collar provides a sealed sleeve; steel clamp coupling uses a mechanical band for fast assembly, especially useful in trenchless drives.
Commissioning points: verify the socket dimensions against the joint specification, because a loose or oversized socket is the most common field failure. Confirm the coupling system chosen matches the installation method, whether open trench or jacking.
3.11 Inspezione in linea
La linea monitora la spessore della parete, il diametro esterno, l'ovalità e la temperatura della zona di saldatura in tempo reale. Le telecamere infrarosse controllano la temperatura della saldatura per catturare immediatamente una saldatura fredda invece che dopo che il tubo è stato sepolto. I goniometri di spessore e diametro alimentano il sistema di controllo per correggere la deviazione prima che diventi scarto.
Commissioning points: calibrate every gauge against a master sample at shift start. Set alarm limits tighter than the final acceptance limits so the operator has margin to react.
4. Material System and Compounding for Large-Diameter HDPE Pipes
L'esecuzione di un tubo a strati vuoti inizia con la resina. Per questo compito, i gradi di materiale standard sono HDPE PE80 e HDPE PE100. PE100 offre una maggiore resistenza alla rottura a stress e consente strutture più sottili e leggere per la stessa classe di pressione o di rigidità, motivo per cui è preferito per i diametri più grandi. I parametri materiali chiave sono la velocità di scorrimento del fusione, la densità, la resistenza all'ossidazione e il contenuto di carbone nero.
| Proprietà | PE80 Tipico | PE100 Typical | Test Condition / Note |
|---|---|---|---|
| Melt flow rate (MFR) | 0.2 to 0.5 g/10min | 0.2 to 0.5 g/10min | 190 degrees C, 5 kg load |
| Density | 0.950 to 0.960 g/cm³ | 0.950 to 0.960 g/cm³ | ISO 1183 method |
| Tempo di induzione dell'ossidazione (OIT) | Not less than 20 min | Not less than 20 min | At 200 degrees C |
| Contenuto di carbone nero | 2.0 to 2.5 percent | 2.0 to 2.5 percent | For weather resistance |
| Dispersione di carbone nero | Grade 1 to 3 | Grade 1 to 3 | Microscopic rating |
The antioxidant package is what delivers the fifty-year life. The oxidation induction time, measured at 200 degrees C, must stay above twenty minutes; a lower value signals insufficient stabilizer and predicts premature brittlement in the ground. Carbon black at 2.0 to 2.5 percent protects the polymer from ultraviolet degradation during above-ground storage and handling, and its dispersion grade matters as much as the quantity because poorly dispersed agglomerates become crack-initiation points.
Recycled content is permitted but must be placed carefully. The structural layer of a hollow wall pipe can incorporate 20 to 30 percent of properly cleaned regrind without a major loss of ring stiffness, because the structural duty is dominated by geometry rather than by absolute resin strength. The inner liner, however, should use full virgin material so the flow surface is smooth, clean, and free of contaminants that could harbor bacteria or leach odor. This split approach is the most cost-effective way to meet both performance and sustainability targets.
Compounding discipline is the practical lesson. Regrind must be dry, free of foreign polymer, and metered consistently; a fluctuating regrind ratio changes melt behavior and shows up as wall-thickness variation at the die. Faygo lines integrate gravimetric or loss-in-weight feeding so the regrind percentage is held constant pipe after pipe.
5. Standards and Acceptance Specification
Large-diameter structured-wall drainage pipe is governed by a stack of national and international standards. In China the governing product standard is GB/T 19472.2 for HDPE winding structured-wall pipes. Internazionalely, ISO 21138, EN 13476, and ASTM F894 define equivalent structured-wall pipe requirements. The performance tests referenced across these standards include ring stiffness per ISO 9969, impact resistance per ISO 3127, creep ratio per ISO 9967, oven test for dimensional stability, weld peel test, and water or air tightness test.
Acceptance is not a single number but a set of coordinated limits. The following table lists the principal acceptance items and their reference targets for a flood-control grade pipe.
| Acceptance Item | Reference Standard | Typical Acceptance Limit |
|---|---|---|
| Ring stiffness | 2, ISO 4427 | Meets declared SN grade (SN8, SN12.5 or SN16) |
| Impact resistance | 4. ISO | No crack at specified drop energy, 0 degrees C |
| Creep ratio | ISO 9967 | Not more than 4.0 (long-term load) |
| Oven test | Relevant product standard | No delamination, wall remains bonded |
| Weld peel strength | Internal method per standard | Not less than 90 percent of parent material |
| Water tightness | Closed water / closed air test | No leakage at test pressure |
| Ovality after demold | Internal control | Within specified tolerance for diameter |
The closed water or closed air test is the field-level proof that joints and wall are continuous. For deep-tunnel service, specifying SN12.5 or SN16 plus a verified weld strength is the difference between a pipe that survives forty meters of cover and one that ovalizes and fails. Faygo configures each line so that these acceptance items can be measured on the production floor, not only in a remote laboratory.
6. Engineering Application and Buried Installation
The hollow wall winding pipe serves a wide range of municipal and industrial duties: deep tunnel drainage mains, stormwater storage tank connections, municipal rain and sewage separation networks, pump station inlet and outlet lines, river channel regulation works, sponge-city infiltration and drainage systems, and industrial wastewater outfalls. The common thread is large flow volume, aggressive chemistry, and the need for a long, maintenance-free life.
Buried performance depends on the interaction between pipe stiffness, burial depth, trench width, and backfill quality. A stiffer pipe tolerates more cover and heavier traffic; a well-compacted, correctly graded backfill spreads the load so the pipe sees closer to the ideal uniform pressure. The following table gives a planning-level mapping of service condition to recommended ring stiffness grade and backfill requirement. These are starting points; a qualified engineer must confirm against local soil and traffic data.
| Service Condition | Recommended SN Grade | Burial Depth | Backfill Requirement |
|---|---|---|---|
| Shallow stormwater, light cover | SN4 to SN8 | 1 to 3 m | Graded, compacted to 90 percent |
| Municipal trunk sewer | SN8 | 3 to 6 m | Graded, compacted to 95 percent |
| Deep trunk, heavy traffic | SN12.5 | 6 to 12 m | Controlled granular, 95 percent minimum |
| Deep drainage tunnel (30 to 60 m) | SN16 | 30 to 60 m | Engineered placement, monitored compaction |
| Industrial wastewater outfall | SN8 a SN12,5 | 2 to 8 m | Chemically inert backfill where required |
La larghezza della tranvia e la dimensione delle particelle del riempimento sono anche importanti. Una tranvia stretta concentra la carico sul capo del tubo, mentre una tranvia troppo larga aumenta la carico del terreno. La dimensione delle particelle del riempimento deve essere priva di rocce affilate che potrebbero perforare la parete, e il livello di compattezza deve raggiungere almeno il 95% nella zona critica intorno al tubo. La flessibilità del tubo è un vantaggio in questo caso: un tubo flessibile installato correttamente si curva leggermente e si allinea con il terreno circostante, condividendo la carico, che è esattamente il comportamento che il grado di rigidità dell'anello è progettato per supportare.
7. Special Challenges of Super-Large Diameter and Countermeasures
L'ammodernamento di una linea di rullaggio da DN800 a DN3000 introduce problemi che non esistono a dimensioni più piccole. Ogni problema deve essere previsto nel design della macchina e nel piano di messa in servizio.
Mandrel deflection and concentricity. A mandrel thirty meters long and three meters in diameter is a large rotating mass. Under its own weight and the winding load it can deflect, producing a pipe that is not truly round. Countermeasure: a stiffened mandrel structure with intermediate support, precision bearing alignment, and a variable-diameter mechanism that is verified for concentricity across its full range.
Uneven cooling shrinkage causing ovality. A thick wound wall cools from the outside in; the outer surface solidifies first and can pull the section out of round as the inner material shrinks. Countermeasure: controlled, zoned cooling with internal temperature management and shaping rolls that hold geometry until set, plus an ovality check before demolding.
Weld quality control at large diameter. The weld seam is longer and the heat history is more variable on a big pipe, so the risk of a cold or weak weld rises with diameter. Countermeasure: infrared weld-temperature monitoring on every turn, automatic rejection of out-of-range seams, and periodic peel testing built into the production routine.
Long-distance transport. A DN2000 or larger pipe is too large to ship as a single long piece, so it is produced in shorter segments and joined on site. Countermeasure: design the line for clean, standardized socket ends and supply matching electrofusion or clamp jointing systems so field assembly is repeatable.
Hoisting and lowering. A large structured-wall pipe, though light for its diameter, still demands careful slinging to avoid point loads that dent the wall. Countermeasure: supply dedicated lifting bands and handling procedure documentation with each line, and engineer the wall to tolerate the specified lift points.
Single-piece weight and production节拍. As diameter grows, each meter of pipe weighs more and the winding cycle lengthens, so line throughput in meters per day falls even when extruder output is constant. Countermeasure: balance the extruder size, mandrel speed, and strip width so the bottle neck is managed, and select the configuration that matches the target annual output rather than the maximum possible diameter.
8. Faygo Real Machine Modules for Hollow Wall Winding Pipe Production
Faygo, una fabbrica Wanplas, costruisce l'intera macchina per la produzione di questi tubi. I due moduli qui sotto sono tratti dalla famiglia di prodotti di estrusione dei tubi di Faygo, che copre i tubi in PE, PVC e PP da 12 mm fino a 575 mm nella serie standard e si estende a diametri estremamente grandi attraverso la configurazione di rullamento a parete vuota. Entrambi i moduli sono certificati CE e ISO e vengono forniti dopo un test di funzionamento continuo di 72 ore.
8.1 Faygo Large-Diameter HDPE Hollow Wall Winding Linea di estrusione tubi
Questo modulo è il cuore della macchina per il rullaggio di tubi a parete vuota da DN800 a DN3000. Copia un grande estrattore a singola scatola con un mandrino rotante di diametro variabile e un carro di saldatura sincronizzato. È la configurazione utilizzata per i tubi di drenaggio per tunnel profondi e le grandi tubature meteorologiche comunali.
| Specification | Faygo Winding Line (Standard Large-Diameter Config) |
|---|---|
| Applicable pipe diameter (DN) | DN800 to DN2000, expandable to DN3000 |
| Achievable ring stiffness grade | SN2 / SN4 / SN8 / SN12.5 / SN16 |
| Main extruder | Single-screw φ120 mm, L/D 33, HDPE barrier screw with mixing head |
| Throughput | 800 to 1500 kg/h |
| Auxiliary extruder | Single-screw φ65 mm for liner and weld bead |
| Mandrel rotation speed | 0.5 to 4 rpm, variable-diameter DN800 to DN3000 |
| Potenza installata | Approx. 210 kW |
| Line length and footprint | Approx. 32 m per 6 m |
| Control system | PLC with HMI, recipe management, remote monitoring |
8.2 Faygo HDPE Linea di estrusione tubi (Serie per l’acqua e il drenaggio municipale)
Questo modulo è una linea di estrusione di tubi Faygos, che copre la gamma di diametro medio per le funzioni di approvvigionamento idrico, drenaggio, gas, comunicazione e irrigazione agricola. È la macchina complementare quando un progetto ha bisogno sia di tubi a spirale di grandi dimensioni per il tronco che di tubi HDPE convenzionali per le ramificazioni e le connessioni. La serie di attrezzature principali gestisce i diametri da 12 mm a 575 mm in PE, PVC e PP con uno spessore della parete fino a 6,5 mm.
| Specification | Faygo HDPE Linea di estrusione tubi (Medium-Diameter Series) |
|---|---|
| Applicable pipe diameter (DN) | DN110 to DN575 (solid-wall and structured medium diameter) |
| Achievable ring stiffness grade | SN4 / SN8 / SN12.5 / SN16 (structured configurations) |
| Main extruder | Single-screw φ90 to φ120 mm, L/D 33 to 36, HDPE barrier screw |
| Throughput | 500 to 1200 kg/h |
| Materiali | PE / PVC / PP, wall thickness up to 6.5 mm |
| Line speed control | Closed-loop haul-off synchronized with extruder |
| Potenza installata | Approx. 160 kW |
| Line length and footprint | Approx. 28 m by 4 m |
| Control system | PLC with HMI, recipe management, remote monitoring |
Both modules share Faygo’s intelligent control platform, which lets the operator set parameters freely and adjust them in real time, and both use internationally renowned brand electrical components for reliability. When a project combines a deep-tunnel trunk with a distribution network, Wanplas can supply the matched pairing of the winding line and the medium-diameter line from one engineering source.
9. Requirement to Consigli per la selezione del modello
La scelta della configurazione inizia da tre variabili: il range di diametro del tubo, il grado di rigidità dell'anello richiesto e l'obiettivo di produzione annuale. Il seguente tabellino associa i profili di progetto comuni a una configurazione Faygo raccomandata.
| Diameter Range | Ring Stiffness Requirement | Target Annual Output | Configurazione Faygo raccomandata |
|---|---|---|---|
| DN800 to DN1200 | SN8 | Up to 30,000 m/year | Winding line, φ120 mm main extruder |
| DN1200 to DN2000 | SN12.5 | 30,000 to 50,000 m/year | Winding line, φ150 mm main extruder |
| DN2000 to DN3000 | SN16 | 20,000 m/year and above | Winding line, heavy mandrel, φ150 mm plus auxiliary |
| DN110 to DN575 | SN8 to SN16 | 50,000 m/year and above | HDPE pipe extrusion line, medium-diameter series |
| Mixed trunk and laterals | SN8 to SN16 | Project-dependent | Winding line plus medium-diameter line from Wanplas |
La logica di selezione è semplice. Abbinare il diametro dell'estrattore alla capacità richiesta, abbinare la gamma del mandrino al diametro e abbinare la cavità di toglie della parete al grado di rigidità. Esagerare nel dimensionamento consuma capitale; sottodimensionare costringe la linea a funzionare oltre il suo ritmo di progettazione e degrada la qualità della saldatura. I tecnici Faygo esaminano il mix di dimensioni del tubo e l'obiettivo di produzione previsto prima di definire la configurazione per garantire che la linea consegnata si posizioni al punto giusto su questo tabellino.
10. Common Quality Defects and Countermeasures
Even a well-designed line produces defects if parameters drift. The table below lists the typical failures in hollow wall winding pipe production and the corrective action for each.
| Defect | Likely Cause | Countermeasure |
|---|---|---|
| Weld virtual weld or cracking | Weld temperature below range, insufficient pressure | Raise weld zone to 210 to 240 degrees C, increase pressure wheel force, verify with peel test |
| Ring stiffness below grade | Wrong cavity geometry, thin wall, weak weld | Recalibrate profile die, increase wall height, confirm weld continuity |
| Ovality exceeds limit | Uneven cooling, mandrel deflection | Balance zoned cooling, check mandrel support and alignment |
| Collasso della parete interna | Liner under-extruded or vacuum loss | Raise auxiliary extruder output, restore vacuum sizing |
| Cavity deformation | Profile die imbalance, over-pressure at die lip | Rebalance flow channel, adjust die lip symmetrically |
| Uneven wall thickness | Melt pressure swing, unstable screw feed | Stabilize barrel temperature, check barrier screw and feeding |
| Surface weld line mark | Poor fusion at strip edge, contamination | Clean strip edge, optimize weld temperature and lap |
| Creep exceeds limit | Material below grade, excessive regrind | Use certified PE100, reduce regrind in structural layer |
Most of these defects trace back to three root causes: unstable melt, mis-set weld, and uneven cooling. The on-line inspection package described earlier exists to catch the first two before the pipe leaves the mandrel, which is far cheaper than rejecting a finished length.
11. Service Support and How to Start Your Project
Buying a super-large winding line is the start of a long production relationship, and Faygo, a Wanplas factory, structures its support around that reality. Every line is run through 72 ore di operazione continua testing before shipment, so the customer receives a machine that has already proven its pace. Installation and commissioning are handled by Faygo engineers who set the line to the customer’s specific pipe program and train the local team on operation and maintenance.
La politica dei pezzi di ricambio segue l'impegno del gruppo Wanplas: 500 dollari di pezzi di ricambio gratuiti ogni anno, oltre alla sostituzione garantita per i pezzi danneggiati durante il periodo di validità. Il supporto di manutenzione e operazione a distanza consente ai tecnici Faygo di leggere i dati del PLC e diagnosticare i problemi senza attendere una visita sul sito, mantenendo il tempo di fermo al minimo. La formazione copre non solo l'operazione della macchina ma anche i conoscimenti sul processo necessari per mantenere la rigidità dell'anello e la qualità della saldatura in tutta la gamma di dimensioni.
Faygo offre anche servizi di consulenza di fabbrica che si estendono oltre la macchina stessa: progettazione di energia elettrica e idrica, layout della sala di lavoro in 3D, configurazione e formazione dei lavoratori e supporto per la costruzione di nuove fabbriche o l'espansione della capacità. La politica di fabbrica aperta accoglie i clienti per visitare l'impianto di Zhangjiagang, vedere la fabbrica FAYGOPLAST di 26.650 metri quadrati e assistere a una linea in funzione prima di effettuare un ordine.
Per iniziare, inviate il range di dimensioni del tubo, il grado di rigidità dell'anello richiesto, l'obiettivo di produzione annuale e il metodo di installazione. Faygo preparerà una configurazione personalizzata e una prova di linea per verificare che il tubo soddisfi la vostra specifica di accettazione prima di impegnarsi nella produzione completa.
12. Domande frequenti
What diameter can a hollow wall winding pipe machine produce?
Una linea di rullaggio adeguatamente configurata copre da circa DN800 fino a DN3000 e oltre. Il limite superiore è stabilito dal diametro del mandrino e dallo spazio a disposizione piuttosto che dalla toglia, motivo per cui la tecnologia di rullaggio raggiunge i diametri che l'estrusione a parete solida non può. Il modulo di grande diametro di Faygo è specificato per DN800 a DN2000 come standard e si espande a DN3000 con la configurazione del mandrino pesante.
Why is HDPE chosen over concrete or steel for deep drainage tunnels?
L' HDPE è chimicamente inerte nella gamma completa di pH 2 a pH 12 presente nelle acque di drenaggio e di accumulo, quindi non subisce la corrosione che limita la durata di servizio del cemento e dell'acciaio. La sua bassa massa semplifica il sollevamento e l'installazione senza scavi, e il suo collegamento flessibile tollera i movimenti del terreno. Con un grado verificato SN16 e una parete saldata, soddisfa l'obiettivo di una durata di progettazione di cinquanta anni senza rivestimento interno o protezione catodica.
Come viene controllata la rigidità dell'anello su una linea di rullaggio?
La rigidità dell'anello viene controllata dall'altezza della parete strutturale, dalla forma delle cavità, dal numero di cavità e dalla qualità della saldatura tra le torri. La macchina di produzione regola queste caratteristiche attraverso la geometria della matrice del profilo e i parametri di saldatura. Poiché la rigidità dell'anello scala con il secondo momento di area della parete e diminuisce con il cubo del diametro, la geometria ottimizzata della struttura di rullaggio è ciò che rende possibile un diametro grande a una massa pratica.
Can recycled material be used in these pipes?
Sì, entro i limiti. La parete strutturale può incorporare il 20-30% di riutilizzo correttamente pulito perché il compito strutturale è dominato dalla geometria. Il liner interno deve rimanere completamente materiale nuovo per mantenere la superficie di flusso pulita e liscia. Le linee Faygo utilizzano l'alimentazione gravimetrica per mantenere costante il rapporto di riutilizzo per mantenere costante il comportamento della fusione tubo dopo tubo.
Queste sono le norme applicabili ai tubi di drenaggio a parete vuota rullati.
I principali standard sono GB/T 19472.2 in Cina, con ISO 21138, EN 13476 e ASTM F894 che coprono gli equivalenti internazionali. Il rendimento viene verificato attraverso la rigidità del cerchio secondo ISO 9969, l'impatto secondo ISO 3127, il rapporto di creep secondo ISO 9967, il test in forno, il test di separazione della saldatura e un test di impermeabilità all'acqua o all'aria chiuso. Gli obiettivi di accettazione devono essere specificati per ogni progetto insieme al grado SN richiesto.
Qual è la differenza tra i tubi a parete vuota rullati e i tubi a doppia parete corrugati?
Both are structured-wall pipes, but corrugated pipe is formed by a continuous corrugator with a fixed maximum diameter, typically up to DN1200. Hollow wall winding pipe is built by helically winding a hollow profile on a mandrel, which removes the diameter ceiling and reaches DN3000. Winding pipe also gives higher ring stiffness efficiency per unit mass, making it the preferred choice for deep trunk and tunnel service.
Come Faygo verifica la qualità della saldatura su un tubo di grande diametro?
La linea monitora la temperatura della zona di saldatura con sensori infrarossi su ogni giro e segnala automaticamente o rifiuta le saldature fuori dalla finestra di 210-240 gradi C. I test di sfilamento periodici confermano che la saldatura raggiunga almeno il 90% della resistenza del materiale di base. Poiché una saldatura debole collassa il secondo momento di area efficace delle sezioni, la verifica della saldatura viene trattata come una condizione di fermo della linea piuttosto che un controllo di campionamento.
Conclusione
Il tubo a parete vuota in HDPE di grandi dimensioni è la tecnologia che consente la gestione moderna delle inondazioni urbane e dei tunnel di drenaggio profondi, dove i diametri fino a DN3000, la rigidità del cerchio fino a SN16, la durata di cinquanta anni e la resistenza in tutto l'intervallo di pH sono non negoziabili. La macchina di produzione che produce questo tubo è una sequenza sincronizzata di estrusione, matrice di profilo, mandrino rotante di diametro variabile, saldatura a fusione a caldo, modellatura, taglio e controllo in linea, ciascuna calibrata per garantire che la parete vuota offra la massima rigidità per unità di polimero.
Faygo, a Wanplas factory with 22 years of pipe and profile extrusion experience, supplies the complete winding line and the complementary medium-diameter HDPE pipe line, both CE and ISO certified and tested for 72 hours before shipment. From material compounding through acceptance testing to installation, commissioning, and the USD 500 annual free parts policy, the support covers the full production life. If your project calls for DN800 to DN3000 flood-control or deep-tunnel pipe, send your diameter range, stiffness grade, output target, and installation method, and Faygo will configure a line and run a sample trial so you can verify the result before you commit.
