What a PVC Door and Window Sealing Strip Co-Extrusion Line Delivers
A PVC door and window sealing strip co-extrusion line is a dedicated profile extrusion system that forms weather stripping in a single, continuous pass by joining a rigid or semi-rigid PVC carrier with a soft sealing lip made from thermoplastic elastomer or a soft PVC compound. The result is a finished gasket that no longer needs to be assembled from two separate parts: the mounting base, which locks into the profile groove, and the flexible lip, which compresses against the frame to block wind, water, dust, and noise. For architectural aluminum, uPVC, and wooden door and window systems, this integrated strip is the difference between a window that leaks on the first storm and one that stays tight for decades.
Faygo, a Wanplas factory, has spent 22 years building pipe and profile extrusion systems, and its FAYGOPLAST platform in Zhangjiagang covers 26,650 square meters with three specialized factories. The sealing strip co-extrusion line described here is built on the same profile extrusion knowledge that Faygo applies to PVC window profiles, decorative profiles, and custom extrusions, then extended with a second extruder and a co-extrusion die so that hard and soft materials fuse at the die land rather than being glued afterward. Every line leaves the factory after a 72-hour continuous operation test and is CE and ISO certified.
This article explains how the line is configured, what each section does, which strip geometries map to which machine layouts, how materials and weather resistance interact, how co-extrusion compares with single-material extrusion, and how to select the right configuration for a given architectural profile. It also walks through the standards that govern door and window sealing strips in China and internationally, and closes with the selection guide, application industries, service support, and a list of frequently asked questions.
Table of Contents
Use the anchors below to jump to a section on this page:
- What a PVC door and window sealing strip co-extrusion line delivers
- How the co-extrusion process works step by step
- Typical production line configurations and technical specifications
- Strip types and the machine configuration they require
- Materials, weather resistance, and UV performance
- Co-extrusion versus single-material extrusion
- Faygo PVC profile co-extrusion product spotlight
- Selection guide: matching demand to configuration
- Application industries and end products
- Standards, quality control, and weather resistance testing
- Installation, commissioning, and service support
- Frequently asked questions
- Talk to Faygo about your sealing strip line
How the Co-Extrusion Process Works Step by Step
Co-extrusion is the simultaneous extrusion of two or more polymer melts through a shared die so that they bond at the interface while still molten. For a door and window sealing strip, the line normally carries one parallel twin-screw extruder for the PVC carrier and one single-screw extruder for the soft TPE or soft PVC lip. Both melts meet inside a co-extrusion die where the flow channels are balanced so the two materials joint without delamination, then the combined profile enters the calibration and cooling section as one piece.
The full sequence from raw material to cut strip runs as follows:
1. Material preparation and feeding. The PVC compound is dosed through a loss-in-weight feeder or volumetric feeder into the twin-screw barrel, while the TPE or soft PVC is fed into the single-screw barrel from a separate dryer or hopper. PVC for rigid carriers is typically a calcium-zinc stabilized compound; the soft lip uses a thermoplastic elastomer such as TPE-S, TPV, or a plasticized soft PVC. Feed accuracy matters because the lip-to-base ratio defines the final compression and recovery behavior of the gasket.
2. Plasticizing in the barrels. Inside the parallel co-rotating twin-screw barrel the PVC is mixed, plasticized, and homogenized at a melt temperature around 175 to 200 degrees Celsius. The single-screw barrel plasticizes the soft material at a lower temperature, often 160 to 185 degrees Celsius, to protect the elastomer from thermal degradation. Screw design, L/D ratio, and barrel temperature profile are tuned so both melts reach the die at matched viscosity.
3. Co-extrusion die. The die is the heart of the line. It receives two melt streams and merges them so the soft lip is encapsulated or laminated onto the rigid base. A well-designed die keeps shear low, avoids stagnant zones where PVC could decompose, and lets the operator adjust the thickness of the lip independently by changing the single-screw output. Multi-cavity dies can form several strips side by side to raise throughput.
4. Vacuum calibration and cooling. Directly after the die the profile passes through a vacuum calibration table. A vacuum calibration sleeve fixes the outer dimensions of the rigid base to tight tolerances while spray or bath cooling sets the shape. For sealing strips the critical dimension is the barb or bulb that locks into the profile groove, so the calibration sleeve is engineered to hold that feature within a fraction of a millimeter.
5. Haul-off. A caterpillar haul-off grips the strip without crushing the soft lip and pulls it forward at a steady line speed. Because the soft lip has almost no stiffness, the haul-off must apply even pressure across the width; many lines use a wide belt or dual-track design. Line speed is the main lever for output and is set by the cooling capacity and the melt strength of the lip.
6. Cutting and collection. A servo-driven fly knife or fixed-length cutter severs the continuous strip into coils or lengths. For automatic window production the strip is usually wound onto rolls; for replacement-market gaskets it is cut to length. The cut pieces are then inspected, packed, and moved to the next process.
Typical Production Line Configurations and Technical Specifications
A sealing strip co-extrusion line is scaled by strip width, lip complexity, and required output. The table below shows three representative configurations that Faygo builds on the FAYGOPLAST profile platform. These are configuration classes rather than fixed model codes; each line is engineered to the customer’s strip cross-section and target output.
| Parameter | Compact line | Standard line | High-output line |
|---|---|---|---|
| PVC carrier extruder | Parallel twin-screw 51 mm | Parallel twin-screw 65 mm | Parallel twin-screw 65 mm, high torque |
| Soft lip extruder | Single-screw 30 mm | Single-screw 45 mm | Single-screw 45 mm, twin feed |
| Screw L/D ratio | Twin 40:1, single 25:1 | Twin 44:1, single 28:1 | Twin 48:1, single 30:1 |
| Co-extrusion die | Single or double cavity | Double or four cavity | Four or six cavity |
| Strip width range | 6 to 20 mm | 10 to 35 mm | 15 to 50 mm |
| Calibration table length | 3 m vacuum | 4 to 6 m vacuum | 6 to 9 m vacuum |
| Line speed | 1 to 4 m/min | 2 to 6 m/min | 3 to 10 m/min |
| Combined output | 40 to 70 kg/h | 70 to 120 kg/h | 120 to 200 kg/h |
| Haul-off type | Belt caterpillar | Wide belt caterpillar | Dual-track servo |
| Cutter | Fixed-length saw | Servo fly knife | Servo fly knife, multi-station |
| Control system | PLC plus HMI | PLC plus HMI, inverter drives | PLC plus HMI, servo with data logging |
| Certification | CE, ISO | CE, ISO | CE, ISO |
The numbers above are configuration ranges. The exact screw diameter, die cavity count, and line speed are set after Faygo receives the customer’s strip cross-section drawing and target meters per minute. Because the line is a profile system rather than a fixed package, the same haul-off and cutter can serve different dies, which protects the buyer from being locked into one strip design.
Strip Types and the Machine Configuration They Require
Architectural sealing strips come in several cross-section families, and each family stresses a different part of the line. A wool-pile-free flexible lip wants a clean soft-material channel; a bulb seal wants balanced cooling so the bulb stays round; a fin or flap seal wants a thin lip that needs precise speed control; a multi-chamber carrier wants a stable rigid base. The table below maps common strip types to the machine configuration that produces them reliably.
| Strip type | Base material | Lip material | Recommended extruder set | Die and cooling note |
|---|---|---|---|---|
| Clip-in barb seal | Rigid PVC | TPE or TPV | Twin 51 + single 30 | Tight calibration sleeve for barb |
| Bulb weather seal | Rigid or semi-rigid PVC | Soft PVC or TPE | Twin 65 + single 45 | Symmetric cooling to keep bulb round |
| Fin or flap seal | Rigid PVC | Soft PVC | Twin 51 + single 30 | Low shear die, precise speed control |
| Multi-chamber carrier | Rigid PVC | TPE at one edge | Twin 65 + single 45 | Longer calibration, stiff base cooling first |
| Dual-lip compression seal | Semi-rigid PVC | TPE-S both lips | Twin 65 + single 45 twin feed | Two soft channels balanced in die |
| Wiper blade seal | Rigid PVC | Soft PVC | Twin 51 + single 30 | Thin lip needs steady haul-off tension |
When a customer already produces single-material PVC strips and wants to add a soft lip, the cheapest upgrade is usually a single-screw extruder plus a co-extrusion adapter and a new die, reusing the existing calibration table and haul-off. Faygo’s turnkey team reviews the current layout before recommending whether to add a second extruder or replace the line, which is where the selection guide in a later section helps.
Materials, Weather Resistance, and UV Performance
The performance of a sealing strip over its service life is decided mostly by the lip material, because the lip does the compressing and the base only has to hold position. The carrier is almost always a rigid or semi-rigid PVC chosen for dimensional stability and resistance to the groove; the lip is where weather resistance, low-temperature flexibility, and UV stability are won or lost.
| Material | Hardness (Shore A) | Low-temp flexibility | UV and weather resistance | Compression set | Typical use |
|---|---|---|---|---|---|
| Plasticized soft PVC | 55 to 80 | Fair, stiffens below 0 C | Moderate, needs stabilizer | Higher | Indoor and mild-climate gaskets |
| TPE-S (styrenic) | 50 to 85 | Good down to minus 30 C | Good with UV package | Low to moderate | General exterior weather strip |
| TPV (EPDM-like TPE) | 60 to 85 | Excellent, minus 40 C | Excellent, UV stable | Very low | Harsh exterior, long-life seals |
| EPDM rubber | 55 to 80 | Excellent | Excellent | Very low | Premium co-extruded with PVC |
| Rigid PVC carrier | Shore D 70 to 80 | Brittle below minus 10 C | Good with TiO2 | N/A | Mounting base and barb |
For exterior doors and windows the lip should be a TPV or TPE-S with a UV stabilizer package and, for white or colored strips, a titanium-dioxide level that resists chalking. Pure plasticized soft PVC is the lowest-cost option and is acceptable for interior or sheltered gaskets, but it hardens and loses compression recovery faster outdoors, which is why co-extruding a TPE lip onto a PVC base is the common upgrade path. The base itself is typically a calcium-zinc stabilized rigid PVC with titanium dioxide for color retention, so the whole strip stays weather resistant without painting.
Weather resistance is verified by accelerated aging: heat aging to check hardness change, ozone exposure for crack resistance, and a xenon-arc or fluorescent UV cycle to check color and surface change. A strip that passes these tests keeps its seal after years of sun and freeze-thaw cycles, which is exactly what GB/T 12002 and the corresponding ISO guidance require for architectural sealing products.
Regrind handling is part of the material decision. The rigid PVC base can usually accept a controlled percentage of clean in-house regrind from start-up and edge trim without losing groove retention, provided the regrind is free of the soft lip material and is metered back through the loss-in-weight feeder rather than dumped in by volume. The soft lip, by contrast, is rarely reground into the same product because elastomer reprocessing changes hardness and recovery; off-grade soft material is better routed to a less demanding grade or a closed-loop compound stream. Faygo’s recipe system lets the operator set a separate regrind ratio for the base so the line stays consistent run after run. Color matching is another material task: white and foiled strips need a stable titanium-dioxide level and a compatible pigment package, while dark strips need carbon-black grade and loading chosen so the lip does not chalk under UV. Because the base and lip are dosed from separate extruders, each can carry its own color without cross-contamination, which is a quiet advantage of co-extrusion over painting a finished strip after the fact.
Co-Extrusion Versus Single-Material Extrusion
Before co-extrusion became standard, many gaskets were either all-PVC strips or separate rubber lips pushed into a groove after the frame was made. Co-extrusion changes the economics and the performance at the same time. The comparison below helps a buyer decide whether the second extruder and co-extrusion die are worth the added complexity.
| Aspect | Single-material PVC strip | Separate lip inserted later | PVC plus TPE co-extruded strip |
|---|---|---|---|
| Sealing performance | Limited, hard lip | Good if lip stays in | Best, bonded soft lip |
| Process steps | One extruder | Extrude plus assemble | One pass, two extruders |
| Bond reliability | N/A | Can loosen or fall out | Molecular bond at interface |
| Material cost | Low | Medium | Medium |
| Equipment complexity | Low | Low plus assembly | Medium, two extruders and die |
| Weather life | Short outdoors | Medium | Long with TPV lip |
| Scrap and rework | Low | Higher from assembly | Low after tuning |
The practical conclusion is that for any exterior or high-specification architectural profile, co-extrusion pays back through fewer assembly steps and a more reliable seal, while the all-PVC strip stays relevant only for the lowest-cost interior applications. The incremental cost of a second single-screw extruder is small against the labor saved by eliminating a post-assembly insertion step, and the bonded interface removes the most common field failure of inserted lips.
Floor space and utilities shape the decision as much as the hardware. A compact sealing strip line fits a modest bay because the downstream is short: die, a three-meter calibration table, a caterpillar haul-off, and a cutter form a line only a little longer than the profile it makes, with the two extruders mounted side by side at the head. A high-output six-cavity line needs more length for cooling and a wider haul-off, plus a larger chiller and air supply for the vacuum calibration, so the utility plan drawn during Faygo’s factory consulting stage should size the water and power before the machines arrive. The intelligent control system also supports remote monitoring, so a small team can run several lines from one control point, which is why the operating cost stays manageable even when output grows. When a plant later wants to double capacity, the usual path is to add a second line on the same platform rather than to overbuild the first one, keeping spare parts and recipes shared across the shop.
Faygo PVC Profile Co-Extrusion Product Spotlight
Faygo, a Wanplas factory, supplies the FAYGOPLAST profile platform that this sealing strip line is built on. Two product modules are shown below with their specification tables. Both draw on Faygo’s 22 years of pipe and profile extrusion experience, its 13 national patents including 8 invention patents, and its CE and ISO certified manufacturing. Each line is tested for 72 hours before delivery.
Faygo PVC Door and Window Sealing Strip Co-Extrusion Line
This is the core line for the article topic. It pairs a parallel twin-screw extruder for the rigid PVC carrier with a single-screw extruder for the soft lip, and ships with a co-extrusion die, vacuum calibration table, caterpillar haul-off, and servo cutter sized to the ordered strip width.
| Item | Specification |
|---|---|
| Carrier extruder | Parallel co-rotating twin-screw, 51 or 65 mm, L/D 40 to 48 |
| Lip extruder | Single-screw, 30 or 45 mm, L/D 25 to 30 |
| Drive | Inverter or servo, internationally branded electrical components |
| Co-extrusion die | Hard plus soft, 1 to 6 cavities, adjustable lip thickness |
| Calibration | Vacuum calibration table 3 to 9 m, water spray and bath |
| Haul-off | Caterpillar, belt or dual-track, speed 1 to 10 m/min |
| Cutter | Servo fly knife or fixed-length saw, coil or length out |
| Control | PLC with HMI, recipe storage, real-time parameter adjustment |
| Output range | 40 to 200 kg/h combined, 1 to 10 m/min line speed |
| Strip width | 6 to 50 mm, custom cross-section supported |
| Pre-delivery test | 72-hour continuous operation test |
| Certification | CE and ISO certified |
Faygo PVC Window Profile Extrusion Line
Faygo’s broader profile extrusion line produces PVC window profiles, door frames, decorative profiles, and custom extrusions, and shares the same calibration, haul-off, and cutting technology used on the sealing strip line. Buyers who make both frames and gaskets can standardize on one supplier platform and one spare-parts list.
| Item | Specification |
|---|---|
| Extruder | Parallel twin-screw, 51 to 80 mm, L/D 40 to 48 |
| Profile types | Window frames, door frames, decorative, WPC composite |
| Die and calibration | Multi-profile die, vacuum calibration, spray cooling |
| Haul-off | Caterpillar, synchronized with extruder |
| Cutting | Planetary or servo fixed-length cutter |
| Control | Intelligent control, free parameter setting, real-time adjust |
| Output | Scaled to profile weight and line speed |
| Factory base | FAYGOPLAST, Zhangjiagang, 26,650 sqm, 3 factories |
| Certification | CE and ISO certified, 72-hour test |
Both modules are supplied as turnkey systems. Faygo’s engineering team designs the die from the customer’s cross-section drawing, runs the 72-hour test on the actual strip or profile, and documents the process recipe so production starts quickly after installation.
Selection Guide: Matching Demand to Configuration
The right line depends on strip width, lip material, target output, and whether the buyer already owns profile extrusion equipment. The table below converts common demand statements into a recommended configuration on the Faygo platform.
| Demand | Recommended line | Lip material | Why |
|---|---|---|---|
| Start-up, narrow interior strips | Compact twin 51 plus single 30 | Soft PVC | Lowest entry cost, enough for 6 to 20 mm |
| Standard exterior weather strip | Standard twin 65 plus single 45 | TPE-S with UV package | Balanced output and weather life |
| Harsh climate, long life | High-output twin 65 plus single 45 | TPV or EPDM-like TPE | Very low compression set, UV stable |
| High volume, multiple cavities | High-output, six-cavity die | TPE-S or TPV | Maximizes meters per minute |
| Already own PVC profile line | Add single-screw plus co-extrusion die | Matches existing base | Reuses calibration and haul-off |
| Frames plus gaskets together | Window profile line plus strip line | Shared PVC base | One platform, one spare-parts list |
If the demand is uncertain, Faygo’s consulting team can model output from the target meters per minute and strip weight, then propose the smallest line that meets it, so the buyer does not pay for unused cavity count or screw diameter. Capacity expansion later is handled by adding cavities or a larger screw rather than replacing the whole line.
Application Industries and End Products
Sealing strips made on this line serve every building envelope that needs a weather barrier. The main application industries are:
Residential and commercial windows. uPVC, aluminum, and wood-aluminum windows use clip-in barb and bulb seals to block air infiltration and rain. A well-made co-extruded strip keeps the frame quiet and dry and cuts heating and cooling loss at the gap.
Entry and balcony doors. Swing, sliding, and folding doors use dual-lip and wiper seals. The soft lip compresses against the threshold while the base stays locked in the door leaf groove, which is where waterproof sealing is decided.
Curtain walls and facades. Large glazed facades rely on compression seals between glazing and frame. Because these seals see full sun and wind load, TPV or TPE-S lips are preferred for long service life.
Automotive and transport. Although this article focuses on architectural profiles, the same co-extrusion technology produces cabin and door seals for vehicles, trains, and buses where low-temperature flexibility and ozone resistance matter.
Industrial and cold-storage enclosures. Cold rooms and clean rooms need gaskets that stay flexible at low temperature and resist cleaning chemicals, which points to TPV lips on a rigid PVC or co-extruded base.
Solar and outdoor enclosures. PV module frames and outdoor cabinets use weather strip to keep dust and moisture out of sensitive equipment, again favoring UV-stable lip materials.
Across these industries the common requirement is a strip that installs in one pass, stays bonded, and survives years of compression and weather. That is exactly the problem co-extrusion solves, and it is why Faygo positions the line as a waterproof sealing processing system rather than a simple profile extruder.
Standards, Quality Control, and Weather Resistance Testing
Architectural sealing strips are governed by material and performance standards. In China the key reference is GB/T 12002, the standard for plastic sealing strips used on doors and windows, which sets requirements for hardness, tensile strength, elongation, compression set, heat aging, and ozone resistance. Products intended for export are usually checked against the relevant ISO methods for rubber and plastic weather strip, and against regional building codes that cite weather tightness and air permeability.
Quality control on a Faygo line covers three layers. First, incoming compound is verified for filler load, stabilizer type, and melt flow rate so the barrel and die see a consistent melt. Second, the line is run during the 72-hour pre-delivery test to confirm steady output, stable dimensions, and a bonded interface with no delamination. Third, sample strips are cut and sent for accelerated weather testing: heat aging to confirm hardness change stays within limit, ozone chamber for crack resistance, and a UV cycle for color and surface change.
Compression set is the single most important field metric. A lip with low compression set returns to shape after being squeezed for years, so the door or window keeps sealing. TPV and EPDM-like TPE lead here; plasticized soft PVC is acceptable only where the seal is lightly loaded and sheltered. Faygo documents the lip material and the test result with each line so the buyer can show compliance to GB/T 12002 or the equivalent ISO method.
Dimension control is the second layer. The barb or bulb that locks the strip into the profile groove must hold tolerance, or the strip either falls out or will not insert. The vacuum calibration sleeve and a calibrated haul-off keep this feature within a tight band, and Faygo records the as-built dimensions against the customer drawing before shipment.
Installation, Commissioning, and Service Support
Buying the line is only half the project. Faygo, a Wanplas factory, supplies the full path from layout to stable production. The support covers:
Factory consulting. Water and electricity design, factory site layout with 3D workshop design, worker configuration and training, and new factory construction as a turnkey project. For plants with older equipment, Faygo offers old machine replacement with a plan that targets zero downtime, and capacity expansion that removes bottlenecks to roughly double output.
Turnkey delivery. Customized line design from the strip cross-section, rigorous quality control with the 72-hour test, and end-to-end service covering selection, design, manufacturing, installation, commissioning, training, and maintenance.
Spare parts and warranty. Wanplas group policy provides USD 500 free spare parts every year plus warranty replacement of damaged parts. This keeps a single line running without a large held inventory, which matters for small and medium plants.
Remote operation and support. The PLC and HMI record process recipes and operating data, and Faygo offers 24/7 online technical support plus remote monitoring so engineers can read PLC data and respond to abnormal conditions without a long travel delay. Recipe storage on removable media lets a new strip be produced by loading a saved parameter set.
Open factory. Wanplas welcomes customer visits to the Zhangjiagang base. Seeing the FAYGOPLAST workshop, the calibration tables, and a running line before purchase reduces the risk of mismatch between the ordered line and the real product.
Commissioning follows a fixed sequence: install and level the extruders and downstream, connect utilities, dry and load the compounds, run the die with a trained operator, tune temperatures and speeds to the recipe, verify dimensions on the calibration table, then run the 72-hour test and cut sample strips for the weather test. Training covers daily operation, die cleaning, haul-off belt care, cutter setup, and the recipe system so the customer team can change strip types without outside help.
Common Defects, Causes, and Preventive Maintenance
Even a well-built co-extrusion line shows characteristic defects when a parameter drifts. Knowing the cause lets the operator correct the strip before scrap accumulates. The defects below are the ones most often seen on sealing strip lines, together with the maintenance habits that keep them away.
Delamination at the hard-soft interface. The most serious defect is a lip that peels off the base. It is caused by a viscosity mismatch between the two melts, by too low a die temperature that prevents bonding, or by contamination at the interface. The fix is to balance the single-screw and twin-screw outputs so the two melts meet at matched viscosity, raise the die land temperature slightly, and keep both hoppers and barrels clean. A small amount of tie-layer or a compatible TPE grade also helps adhesion.
Out-of-round bulb or distorted lip. A bulb that flattens or a fin that curls comes from uneven cooling or from haul-off tension that is too high for the soft lip. The calibration table must cool the base first and the lip last, and the caterpillar pressure should be set just high enough to grip. Symmetric spray nozzles and a longer calibration table are the usual corrections on wider strips.
Surface streaking or die lines. Lines along the strip usually mean a dirty die, a dead spot where PVC decomposes, or a filler agglomerate. The remedy is regular die cleaning with the correct tool, a balanced screw that avoids stagnant zones, and compound screening before feeding. Faygo’s twin-screw design emphasizes self-cleaning kneading blocks so decomposed material does not build up in the barrel.
Dimension drift on the locking barb. If the strip no longer inserts or falls out, the calibration sleeve has worn or the haul-off speed has drifted against extruder output. Recurring dimension checks against the customer drawing, sleeve inspection, and closed-loop speed synchronization between extruder and haul-off prevent this. The PLC recipe stores the proven speed so the set point is not guessed after a changeover.
Yellowing or chalking outdoors. This is a material and stabilizer issue rather than a machine fault. It appears when the lip lacks a UV package or the base lacks enough titanium dioxide. Choosing TPV or TPE-S with a rated UV stabilizer and a base with the right pigment load removes the problem at the recipe stage, which is why the material selection in an earlier section matters as much as the hardware.
Preventive maintenance plan. A simple weekly and monthly routine keeps the line at high overall equipment effectiveness. Weekly: clean the die and hopper throat, check haul-off belt tension and wear, verify cutter blade sharpness, and review the recipe against the running parameters. Monthly: inspect the calibration sleeve for scoring, check barrel and gearbox temperatures against baseline, lubricate the haul-off guides, and back up the recipe files. Quarterly: review screw and barrel wear with a process check, calibrate the loss-in-weight feeder, and confirm the vacuum calibration level. Because Wanplas supplies USD 500 free spare parts each year and warranty replacement, worn belts, blades, and seals are replaced without a large held inventory. The 24/7 remote support lets Faygo engineers read the PLC data and suggest correction before a small drift becomes a batch of scrap.
This maintenance discipline is what turns a 72-hour factory test into years of stable production. Buyers who follow it typically keep the line running at high capacity utilization and avoid the two most expensive failures: interface delamination and dimension drift, both of which are recoverable with early correction but costly once a full coil is made wrong.
Frequently Asked Questions
What is the difference between a sealing strip co-extrusion line and a normal PVC profile line?
A normal PVC profile line uses one twin-screw extruder to make a single-material profile. A sealing strip co-extrusion line adds a second single-screw extruder and a co-extrusion die so a soft lip is bonded to a rigid PVC base in one pass. The calibration table, haul-off, and cutter are similar, but the die and the second extruder are what make the soft seal.
Can I run both PVC and TPE on the same line?
Yes. The twin-screw extruder plasticizes the rigid PVC carrier while the single-screw extruder plasticizes the TPE or soft PVC lip. They meet only at the co-extrusion die, so each material stays in its own barrel at its own temperature. The recipe system stores a parameter set for each material pair.
Which lip material should I choose for exterior doors?
For exterior and harsh-climate use, choose a TPV or TPE-S lip with a UV stabilizer package. Plasticized soft PVC is the lowest-cost option and works for interior or sheltered gaskets, but it hardens faster outdoors. The lip material decides weather life more than the base does.
How wide a strip can the line produce?
The Faygo platform covers strip widths from about 6 mm to 50 mm, with custom cross-sections supported through die design. Wider or multi-cavity strips use a larger screw and a longer calibration table. The exact limit is set after Faygo reviews the cross-section drawing and the target meters per minute.
What output can I expect in meters per minute?
Line speed ranges from about 1 m/min on a compact line to 10 m/min on a high-output line, with combined material output from 40 kg/h to 200 kg/h. The real limit is cooling capacity and the melt strength of the soft lip, not the extruder size. Multi-cavity dies raise output without raising line speed.
Does the line meet Chinese and international standards?
Faygo lines are CE and ISO certified, and sample strips can be verified against GB/T 12002 for Chinese architectural sealing strips and the relevant ISO weather-strip methods for export. Faygo documents hardness, compression set, heat aging, and ozone results with each delivery.
What if I already have a PVC profile extruder?
You can usually add a single-screw extruder, a co-extrusion adapter, and a new die to your existing calibration table and haul-off, which is the lowest-cost way to start making sealed strips. Faygo reviews your current layout before recommending an add-on versus a full new line.
How long does commissioning take and what training is included?
Commissioning time depends on strip complexity and utility readiness, but the 72-hour pre-delivery test already proves the line before it ships. On-site commissioning covers installation, recipe tuning, dimension verification, and operator training for daily running, die care, haul-off maintenance, and recipe changeover.
Talk to Faygo About Your Sealing Strip Line
If you are specifying a PVC door and window sealing strip co-extrusion line for architectural profile waterproof sealing, Faygo, a Wanplas factory, can design the line from your strip cross-section and target output, build it on the CE and ISO certified FAYGOPLAST platform, and prove it with a 72-hour test before delivery. Share your cross-section drawing and required meters per minute, and the team will return a configuration with the right twin-screw and single-screw set, die cavity count, calibration length, and a documented process recipe. You are also welcome to visit the Zhangjiagang workshop to see a running line and discuss factory layout, training, and capacity expansion with the engineering team.
