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Product Description
PETG — glycol-modified polyethylene terephthalate — looks like ordinary PET, but it behaves very differently in the extruder. It is a copolyester with the transparency of PET, the impact resistance of an engineering plastic, and the easy formability of a processing-friendly resin. It is food-grade and medical-grade safe, which makes it the material of choice for food and beverage packaging tubes, medical catheters and instrument tubes, cosmetic packaging, toys, stationery, and decorative transparent pipes.
But PETG is also a hygroscopic material. It absorbs moisture from the air, and that moisture is the enemy of a transparent pipe. Extrude PETG without proper drying and the result is predictable: bubbles in the wall, silver streaks on the surface, and a haze that destroys the optical clarity the material is chosen for. Standard hot-air drying is not enough — PETG must be dried with low-dew-point dehumidification to a very low moisture level before it ever reaches the screw.
And drying is only the first discipline. The melt must be plasticized uniformly, without degradation — because degraded copolyester turns yellow and loses impact strength, and a yellow pipe is a rejected pipe. The melt must flow through a die designed for optical quality, without weld lines or flow marks. The pipe must be sized with precision, because food and medical applications demand tight dimensional tolerances. And the cooling must be managed carefully, because a transparent pipe that is cooled too aggressively develops stress whitening — the pipe goes cloudy under stress.
This is why a PETG pipe is not simply "extruded." It is produced by a line — a coordinated sequence of drying, extrusion, sizing, cooling, haul-off, and cutting — where every stage is engineered for the special requirements of copolyester. The Chenxing PETG Pipe Production Line is built as exactly that: a complete, integrated system for crystal-clear PETG pipe, from dry pellets at the inlet to finished, cut-to-length pipe at the outlet.
The line follows a disciplined sequence, designed around the two great risks of PETG extrusion: moisture and heat history.
PETG Pellets (hygroscopic, must be dried) │ ▼ [Dehumidifying Drying System] │ Low-dew-point dry air, moisture reduced to the │ low level PETG requires for bubble-free clarity ▼ [Single-Screw Extruder] │ Copolyester-designed screw, precise temperature control │ Uniform melt, no degradation, no yellowing ▼ [Pipe Die] │ Spiral-flow die design for uniform melt distribution │ No weld lines, no flow marks, optical clarity preserved ▼ [Vacuum Sizing Tank] │ External diameter sizing, roundness and tolerance control ▼ [Cooling Water Tanks] │ Multi-stage cooling, stress-whitening avoided ▼ [Haul-Off Unit] │ Caterpillar traction, speed synchronized with extrusion ▼ [Cutting / Coiling] │ Fixed-length cutting or coiling, automated end stage ▼ [Finished PETG Pipe]
PETG pellets are hygroscopic: they absorb atmospheric moisture, and the absorbed moisture degrades the melt during extrusion — producing bubbles, silver streaks, and haze. The line therefore starts with a low-dew-point dehumidifying drying system, integrated with the extruder and sized for the line's throughput. The pellets are dried to the low moisture level PETG requires before they are conveyed to the screw. An automatic loading system can be included, so the drying hopper is refilled without manual intervention.
The dried PETG is plasticized in a single-screw extruder with a screw designed for copolyester and precise temperature control along the barrel. The screw design balances shear and residence time so the melt is homogeneous and the polymer does not degrade. This is the stage where yellowing is won or lost: controlled temperature and residence time keep the copolyester clear and impact-resistant.
The melt passes through a pipe die with spiral flow channels, which distributes the melt uniformly around the die circumference. A uniform distribution means no weld lines and no flow marks — the pipe emerges with the optical quality that PETG is chosen for. The die geometry is matched to the pipe diameter and wall thickness of the order.
The extruded pipe enters a vacuum sizing tank, where the external diameter is calibrated by vacuum against a sizing sleeve. Vacuum sizing holds the pipe to its nominal diameter with tight roundness and dimensional tolerance — essential for food packaging tubes, medical tubing, and fittings that must assemble precisely.
The sized pipe passes through multi-stage cooling water tanks. Cooling is controlled stage by stage so the pipe is brought down gradually and evenly. Gradual cooling prevents stress whitening — the cloudiness that appears in transparent pipe when internal stresses are frozen into the wall. The result stays crystal-clear.
A caterpillar haul-off unit pulls the pipe at a speed synchronized with the extruder output, holding the wall thickness constant. At the end of the line, the pipe is cut to fixed length by a cutting unit or coiled, depending on the pipe diameter and the order type. The end stage is automated, so the line runs continuously with minimal labor.
The Chenxing PETG pipe line is composed of matched modules. Each component is available in multiple sizes, and the complete line configuration — pipe diameter range, capacity, and auxiliary equipment — is customized to the project on request:
| Module | Function in the PETG Pipe Line |
|---|---|
| Dehumidifying drying system | Low-dew-point drying of hygroscopic PETG pellets before extrusion; automatic loading available |
| Single-screw extruder | Copolyester-designed screw with precise barrel temperature control; uniform, non-degraded melt |
| Pipe die | Spiral-flow melt distribution for uniform wall and optical clarity without weld lines |
| Vacuum sizing tank | External-diameter sizing for roundness and dimensional tolerance |
| Cooling water tanks | Multi-stage controlled cooling to avoid stress whitening in transparent pipe |
| Caterpillar haul-off | Speed-synchronized traction to hold wall thickness constant |
| Cutting / coiling unit | Fixed-length cutting or coiling for the finished pipe |
| Automatic feeding and conveying | Pellet transfer from drying to extruder; regrind return where reclaimed material is used |
The modules are supplied as one integrated line with a shared control system, so drying, extrusion, sizing, haul-off, and cutting operate in a coordinated sequence — not as separate machines bolted together.
Feature: The line integrates a low-dew-point dehumidifying drying system as its first stage, matched to the extruder throughput.
Advantage: PETG pellets are dried to the low moisture level the material requires before they reach the screw.
Benefit: No bubbles, no silver streaks, no haze in the finished pipe. Transparency and mechanical strength are stable from run to run.
Feature: A single-screw extruder with a screw designed for copolyester and precise multi-zone temperature control.
Advantage: The melt is homogeneous and its heat history is controlled, so the polymer does not degrade in the barrel.
Benefit: Smooth, glossy pipe surfaces without flow marks, and low risk of the yellowing and brittleness that degraded copolyester suffers.
Feature: A vacuum sizing tank calibrates the external diameter against a sizing sleeve as the pipe leaves the die.
Advantage: The pipe is held to its nominal diameter with good roundness and controlled dimensional tolerance.
Benefit: Pipe that meets the strict standards of food packaging and medical applications — consistent diameter, roundness, and fit with fittings.
Feature: The line can be configured with food-grade contact materials and clean design for hygienic applications.
Advantage: The production environment matches the requirements of food and medical processing.
Benefit: The line can produce food packaging tubes and medical tubing and instrument tubes — opening the higher-value markets that standard pipe lines cannot reach.
Feature: Spiral-flow die design and multi-stage controlled cooling are engineered to protect transparency.
Advantage: Melt distribution is uniform at the die, and cooling is gradual and even, avoiding internal stress.
Benefit: Low haze, high clarity, and no stress whitening — the pipe looks premium and stays clear in service, exactly what transparent pipe applications demand.
Feature: The drying, extrusion, haul-off, and cutting stages operate under coordinated line control, with the haul-off speed synchronized to the extruder.
Advantage: Wall thickness is held constant and the end stages run automatically.
Benefit: Stable continuous production, uniform wall thickness, low scrap rate, and reduced labor — the line runs with a small crew.
Feature: The line is available in multiple sizes, with pipe diameter range and capacity customized to the project on request.
Advantage: One line configuration can cover a range of pipe diameters and wall thicknesses, with die changes for specification changes.
Benefit: The processor can serve a varied order book — different diameters, different applications — from a single line, maximizing the return on the investment.
Feature: Insulation and drive optimization reduce energy losses in heating and traction.
Advantage: Less energy is spent per kilogram of extruded material, and material losses are controlled through stable processing and efficient end trimming.
Benefit: Lower energy cost per meter of pipe and lower material consumption — a better total cost position in a competitive pipe market.
PETG pipe is specified wherever transparency, impact resistance, and safety are required together:
Food and beverage packaging tubes — PETG's food-grade safety and clarity make it a preferred packaging material.
Medical catheters and instrument tubes — medical-grade PETG is used where clarity and sterilization compatibility matter.
Cosmetic packaging — transparent, impact-resistant tubes for premium cosmetic presentation.
Toys and stationery — clear, safe, and durable transparent components.
Decorative transparent pipe — display and decorative applications where optical quality is the product.
Industrial and functional tubing — where chemical resistance, clarity, and impact strength are useful together.
For each application, the line's drying, extrusion, and sizing configuration is adapted to the pipe specification — pipe diameter, wall thickness, and capacity are customized to the project on request.
PETG is hygroscopic, so the drying system is central to the line. Chenxing's drying range supports the PETG pipe line at every scale:
The dehumidifying dryer supplies low-dew-point dehumidification air for larger pipe line throughputs, with independent temperature control of the drying hoppers.
The conveying integrated crystal dehumidification dryer integrates drying with conveying for compact installations.
The crystal dryer serves laboratory and small-batch material preparation where crystallization and drying are combined.
The STG-U hopper drier / plastic resin dryer serves as a general hot-air drier for materials that need only surface-moisture removal.
Pellet handling around the line uses Chenxing's feeding and conveying equipment: CLF powder suction machines and CLF-L continuous powder suction machines for automatic loading, CSP crushing material suction machines for regrind return, and screw feeders automatic feeding machines for controlled pellet metering. Where the plant recycles its own scrap, plastic crushers reduce rejects for regrind, and a CJ magnetic frame hopper magnet protects the extruder at the feed point.
The PETG pipe line is one member of the Chenxing extrusion family. Each line is engineered for its product form:
| Line | Product Form | Core Characteristics |
|---|---|---|
| PETG pipe production line (this page) | Transparent copolyester pipe and tube | Dehumidifying drying, single-screw extrusion, vacuum sizing, food/medical grade |
| PVC shelf label strip extrusion line | Small-section profile strips | Co-extrusion of label strips, compact profile tooling |
| PVC UV marble sheet making line | Decorative sheets | Sheet extrusion with three-roll polishing, marble-effect UV finish |
| Plastic pelletizer machine | Pellets | Strand pelletizing of compounded materials |
| PVC hot-cutting pelletizing line | Pellets | Hot-cut pelletizing for PVC and WPC |
| Parallel co-rotating twin screw extruder | Compounding | Twin-screw compounding of filled and modified materials |
The family shares Chenxing's material handling ecosystem — drying, conveying, and feeding — but each line's downstream is specific to its product. The PETG pipe line is distinguished by the disciplines of transparent pipe: dehumidifying drying, optical die design, vacuum sizing, and stress-free cooling. For a complete plant, the Advanced Material Processing EPC Project engineers the whole material path — storing, feeding, conveying, weighing, dosing, dehumidifying, drying, and unloading — as one turnkey system around lines like this one.
PETG is glycol-modified polyethylene terephthalate, a copolyester that combines the transparency of PET with higher impact resistance and easier processing. It is food-grade and medical-grade safe, chemically resistant, and formable at moderate temperatures. These properties make it the material of choice for food and beverage packaging tubes, medical catheters and instrument tubes, cosmetic packaging, toys, stationery, and decorative transparent pipes.
PETG is a hygroscopic material — it absorbs moisture from the air, and that moisture degrades the melt during extrusion. Undried PETG produces pipes with bubbles in the wall, silver streaks on the surface, and haze that destroys optical clarity. Hot-air drying is insufficient because it cannot reach the low moisture level PETG requires. The PETG pipe production line therefore starts with a low-dew-point dehumidifying drying system, matched to the extruder throughput, so the pellets are dry before they reach the screw.
The flow is: dehumidifying drying of the hygroscopic PETG pellets, single-screw extrusion with a copolyester-designed screw and precise temperature control, pipe die with spiral flow channels, vacuum sizing of the external diameter, multi-stage cooling, caterpillar haul-off synchronized with the extruder, and finally fixed-length cutting or coiling. Every stage is coordinated through one line control system.
Vacuum sizing holds the pipe against a sizing sleeve by vacuum immediately after it leaves the die, calibrating the external diameter while the pipe is still formable. This fixes the nominal diameter, roundness, and dimensional tolerance precisely — the accuracy that food packaging and medical applications require. The sized pipe then cools in the water tanks while maintaining the calibrated dimensions.
The line produces transparent PETG pipe and tube for food and beverage packaging, medical catheters and instrument tubes, cosmetic packaging, toys, stationery, decorative transparent pipe, and industrial tubing. The configuration — drying capacity, extruder, die, and end stage — is adapted to the pipe specification and the application's hygiene and tolerance requirements.
The line is available in multiple sizes, and the pipe diameter range, wall thickness, and capacity are customized to the project on request. Chenxing sizes the drying system, extruder, die, sizing, and haul-off to the customer's pipe specification, so the line is built around the order rather than the order forced onto a fixed machine.
The PVC lines in the Chenxing family — the shelf label strip line and the UV marble sheet line — process PVC, which is not hygroscopic in the same way and does not require the same dehumidifying discipline. PETG is hygroscopic, must be dried to a low moisture level, and must be protected from degradation to preserve clarity and impact strength. The PETG pipe line is therefore engineered around dehumidifying drying, optical die design, vacuum sizing, and stress-free cooling — the specific disciplines of transparent copolyester pipe.
Step 1 — Define Your Pipe Specification: Tell us the pipe diameters, wall thicknesses, and applications you plan to produce — food packaging, medical, cosmetic, or decorative. If you process reclaimed material, share the regrind ratio and quality, because PETG scrap must be dried and handled with the same discipline as virgin pellets.
Step 2 — Get the Line Design: Chenxing designs the complete line around your specification: the dehumidifying drying system (sized from your throughput), the single-screw extruder, the pipe die, the vacuum sizing and cooling section, and the haul-off and cutting configuration. You receive a line layout, a module list, and a process description — with pipe diameter and capacity customized to your project on request.
Step 3 — Request a Quote from Nicole: Contact Nicole at +8615951187228 or ceo@cxsljx.com with your pipe specification. We respond within 24 hours with a formal quotation, delivery schedule, and configuration options. Chenxing provides installation guidance, commissioning support, and operator training on drying control, extruder temperature profiles, and line coordination.
Step 4 — Produce Crystal-Clear PETG Pipe, Meter after Meter: Once installed, the line produces what it was designed for: transparent, impact-resistant, dimensionally accurate PETG pipe with no bubbles, no streaks, and no stress whitening. Material preparation is handled, the melt is clean, and the pipe is sized and cut automatically — clear from the first meter.
For the complete supporting range, Chenxing also supplies: dehumidifying dryers, crystal dehumidification dryers, crystal dryers, hopper driers, powder suction machines, continuous powder suction machines, crushing material suction machines, screw feeders, plastic crushers, agglomerators, and complete EPC material processing projects. As a single-source partner, Chenxing Machinery supports every step from dry pellets to finished pipe.
Contact Chenxing Machinery Today:
Contact Person: Nicole
Phone / WhatsApp: +8615951187228
Email: ceo@cxsljx.com
Company: Zhangjiagang Chenxing Machinery Co., Ltd.
Website: www.chenxingmachinery.com
