Twin Screw PET Plastic Sheet Extrusion Line 

PET sheet extrusion

Description:

The PET parallel twin screw sheet extrusion line for PET sheet is equipped with degassing system, and no need drying and crystallizing unit. The extrusion line has the properties of low energy consumption, simple production process and easy maintenance. The segmented screw structure can reduce the viscosity loss of PET resin, the symmetrical and thin-wall calender roller highten the cooling effect and improve the capacity and sheet quality. Multi components dosing feeder can control the percentage of virgin material, recycling material and master batch precisely, the sheet is widely used for thermoforming packaging industry.

PET sheet extrusion line

1) Plastic sheet making machine has High capacity.
2) Energy saving: 20% energy saving than normal machines.
3) Four self-designed major core technology of sheet extruder: extrusion system, die, roller, distributor. They are all invented and designed by ourselves. The core technology has many testing points and adopts electrical integration of double protection.
4) The operation fully reflects the man-machine engineering principle, it can make the function more entirely and the operation more simple.
5) Only the tablet machine independently walking, avoid the interference from other power to influence the stability of the tabletting sheet.
6) The plasticizing effect of the sheet is very good. After the sheet formed and walking in curved line, it can make sure the stability of the sheet stock.

PET sheet extrusion line
7) The heating system is controlled by high-grade china heater, stainless heater, inner-storing type single heating pipe and precision temperature-controlling die mould, is exact in controlling temperature, quickly in heating, good in keeping temperature, long life and save time and energy.

PET sheet extrusion line

PET sheet extrusion line

(1) If customers require multilayer PET sheets, the number of extruders needs to be increased. Three-layer PET sheet needs at least two extruders, which can produce PET sheets with ABA structure; it can also be customized according to customer requirements. 5-layer PET sheet, if the sheet structure is ABCBA, then 3 extruders are required, and a distributor is required in front of the mold to adjust the distribution ratio;

(2) According to the purpose of PET sheet, the auxiliary equipment equipped on the PET production line is different. If customers use PET sheets to make blister products, such as plastic electronic product packaging, parts packaging, fast food boxes, plastic cups, etc., then the production line needs to be equipped with silicone oil coating and drying equipment, which is beneficial to PET sheets In the later stage, it is molded on the blister machine and demolded; if the PET sheet produced by the customer is not used for thermoforming, this part can be removed, which can also save the customer the equipment purchase cost; if the PET sheet produced by the customer needs to be used for post-printing Or it can be combined with other materials, then a corona machine needs to be added to the PET sheet equipment. The corona machine can treat the surface of the PET sheet; if the surface of the PET sheet produced by the customer needs to be smooth and bright, it can be on the PET sheet line Increase the upper and lower laminating devices to cover both the front and back sides of the PET sheet with a protective film;

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PET sheet extrusion line

Machine configuration

PET sheet extrusion

PET (Polyethylene terephthalate) extrusion line is a specialized production line used for manufacturing PET films and sheets. PET is a versatile thermoplastic polymer known for its excellent combination of mechanical, thermal, and chemical properties. It is widely used in industries such as packaging, textiles, automotive, and electrical.

Here are some key points about the PET sheet extrusion line: 

1. High-quality extrusion: The PET sheet extrusion line is equipped with a high-performance extruder that ensures efficient and uniform melting and extrusion of the PET resin. This results in excellent film quality and consistency.

2. Precise temperature control: The PET sheet extrusion line features an advanced temperature control system that allows precise adjustment of the heating and cooling zones. This ensures optimal processing conditions, resulting in films with consistent properties and thickness.

3. Multi-layer film capability: The PET sheet extrusion line enables the production of multi-layer films with different functionalities. By incorporating multiple extruders and co-extrusion technology, it is possible to produce films with enhanced barrier properties, improved strength, or specialized surface properties.

4. Versatile film width and thickness: The PET sheet extrusion line offers flexibility in producing films with various widths and thicknesses according to customer requirements. It can accommodate a wide range of film sizes, from thin gauge films used for packaging to thicker sheets used for industrial applications.

PET sheet extrusion

5. Efficient cooling and stretching system: The extrusion line includes a precise cooling and stretching system that ensures controlled cooling and precise stretching of the molten PET film to achieve the desired thickness and properties. This system helps maintain dimensional stability and control orientation.

PET sheet extrusion

6. Surface treatment options: The PET sheet extrusion line can be equipped with additional surface treatment options such as corona treatment or plasma treatment. These treatments enhance the adhesion of inks, coatings, or adhesives to the PET film, enabling better printability, laminating, or bonding properties.

7. Inline quality control: The PET sheet extrusion line incorporates inline monitoring and control systems for key parameters such as film thickness, transparency, and surface defects. This ensures consistent film quality and allows for real-time adjustments and troubleshooting during production.

8. Energy efficiency: The PET sheet extrusion line is designed with energy-efficient components and technologies to minimize energy consumption and reduce operating costs. It utilizes advanced heat recovery systems and optimized heating and cooling processes.

9. Automation and advanced controls: The PET sheet extrusion line is equipped with modern automation and control systems, including PLC touch screens and advanced control algorithms. This facilitates easy operation, monitoring, and adjustments for efficient production.

10. Sustainable production: PET sheet extrusion lines can be designed to incorporate recycling or reclaiming systems, enabling the use of recycled PET material and contributing to a more sustainable production process.

The PET sheet extrusion line offers reliable and efficient production of high-quality PET films and sheets, meeting the diverse needs of industries requiring PET-based materials.

Revolutionize Your Production with GWELL’s High-Performance PET Sheet Extrusion Line!​​

GWELL delivers cutting-edge PET sheet extrusion lines engineered for ​maximum efficiency, precision, and sustainability. Ideal for producing APET, RPET, CPET, and PET-G sheets, our extrusion technology sets new industry benchmarks:

Key Features:

• ​Unmatched Output: Produce up to 50 tons/day with consistent thickness tolerance (±0.02mm).
• ​Energy-Saving Design: Reduce operating costs by up to 25% with advanced thermal control.
• ​Intelligent Control: PLC/HMI automation for real-time monitoring and minimal downtime.
• ​Material Versatility: Compatible with virgin and recycled PET (RPET) for eco-friendly production.
• ​Durability Guaranteed: Robust construction with corrosion-resistant components for 24/7 operation.Contact Our Experts Today!​​

  High-Efficiency PET Sheet Extrusion Line: Technical Guide & Market Advantage

  With the global shift toward eco-friendly packaging, high transparency, and recyclable materials, Polyethylene Terephthalate (PET) sheets have become the gold standard in thermoforming, food packaging, electronics, and industrial applications.

  To help plastics manufacturers, packaging converters, and industrial producers optimize their manufacturing investments, this guide covers the fundamentals of PET sheet technology, equipment components, applications, and the competitive advantages of the GWELL PET Sheet Extrusion Line.

  1. What is a PET Sheet Extrusion Line?

  A PET sheet extrusion line is an automated industrial manufacturing system designed to continuously melt, plasticize, degas, extrude, calendar, cool, and wind high-quality flat PET plastic sheets.

  Because PET resin is inherently hygroscopic (absorbs moisture from air), traditional extrusion processes require energy-intensive pre-crystallization and dehumidifying drying steps to prevent thermal hydrolysis during melting. Modern advanced systems, such as GWELL's twin-screw venting and planetary multi-screw extrusion lines, eliminate the need for drying by utilizing high-vacuum degassing technology, significantly streamlining production and lowering operational costs.

  GWELL offers four primary machinery configurations tailored to specific operational requirements:

• Single-Screw Extrusion Line: Traditional setup with dedicated crystallization and dehumidification drying hopper.

• Single-Screw Exhaust Extrusion Line: Integrated venting design for improved gas removal.

• Twin-Screw Venting Extrusion Line (Non-Crystallization / Non-Drying): High-efficiency system capable of processing 100% bottle flakes (RPET) or virgin pellets directly.

• Planetary Multi-Screw Exhaust Extrusion Line: Ultra-high output system maximizing melt homogenizing and surface-area vacuum contact.

• 2. What is a PET Sheet?

  A PET sheet is a thermoplastic sheet material produced from Polyethylene Terephthalate polymer. Renowned for its optical clarity, chemical resistance, high mechanical strength, and 100% recyclability, PET is one of the most widely processed sheet materials worldwide.

  Common Variations of PET Sheets

  PET Type	Full Name	Primary Characteristics	Key Use Cases
  APET	Amorphous PET	Uncrystallized, high transparency, exceptional toughness, food-grade safe.	Cold food containers, blister packs, clamshells.
  PETG	Glycol-Modified PET	High impact resistance, easy to heat-seal, ideal for thick sheet extrusion (up to several mm).	Decorative films, credit cards, medical trays, furniture laminates.
  RPET	Recycled PET	Made from post-consumer recycled PET bottle flakes; environmentally sustainable.	Eco-friendly thermoforming, seedling trays, general packaging.
  CPET	Crystallized PET	Heat resistant up to $200^circtext{C}$ to $220^circtext{C}$; opaque/white appearance.	Ovenable food trays, microwaveable ready-meal containers.
  GAG	PETG / APET / PETG	3-layer composite sheet combining PETG's low-temperature sealability with APET's core economy.	High-end blister packaging, credit cards, decorative laminates.

  3. Applications of PET Sheets

  Thanks to its physical strength, gas barrier properties, and optical clarity, PET sheets are thermoformed or fabricated into products across several global industries:

  Food & Beverage Packaging

• Produce & Fruit Containers: Clear hinged clamshells, berries/grape punnets, and bakery boxes.

• Thermoformed Cups & Lids: Cold drink cups, deli containers, and portion cups.

• Agricultural Seedling Trays: Durable RPET trays engineered for automated planting systems.

• Electronics & Hardware Packaging

• Anti-Static & Conductive Trays: Precision-molded trays protecting semiconductors, printed circuit boards (PCBs), and sensitive electronic components.

• Display Blister Clamshells: High-clarity hardware and consumer goods packaging.

• Medical & Pharmaceutical Packaging

• Sterile Device Trays: APET/PETG trays requiring low particulate contamination and high impact strength.

• Unit-Dose Blister Covers: Moisture- and dust-resistant pharmaceutical packaging.

• Decorative, Furniture & Printing Industries

• Surface Laminates: High-gloss or matte PETG films applied onto MDF/particleboard for modern kitchen cabinets and furniture.

• Printing & Folding Boxes: Clear folding boxes, face shields, and architectural protective panels.

• 4. What Does a PET Sheet Extrusion Line Contain?

  A complete, automated GWELL PET Sheet Extrusion Line consists of integrated precision modules designed for continuous, high-speed output:

• Raw Material Handling & Dosing System: Multi-component gravimetric dosing units for accurate proportioning of virgin PET pellets, RPET bottle flakes, masterbatch, and anti-block additives.

• Main Extruder Unit:

  • Single-screw system with dedicated dehumidifying dryer hopper, OR

  • Co-rotating twin-screw / planetary extruder equipped with multi-vent vacuum ports.

• High-Vacuum Degassing System:

  • High-capacity Roots rotary vane pump system capable of achieving high vacuum levels (up to $10text{ Pa}$).

  • Rapidly extracts moisture, volatiles, and monomer residues from molten PET without pre-drying.

• Melt Metering Pump & Screen Changer:

  • High-pressure gear pump ensures pulseless melt delivery to the die.

  • Continuous hydraulic double-piston or back-flush screen changer enables filter changes without stopping production.

• Multi-Layer Co-Extrusion Feedblock & T-Die:

  • Precision co-extrusion distributor (A/B/A, A/B, or GAG layer structures).

  • Streamlined, coat-hanger T-die with flexible die lip for exact sheet width and thickness control.

• Three-Roll Calender Stack (Calendering Unit):

  • Heavy-duty vertical, inclined, or horizontal 3-roller arrangement with independent oil or water temperature control channels.

  • Ensures rapid cooling below the crystallization window ($100^circtext{C}$–$180^circtext{C}$) to guarantee high transparency.

• Cooling Bracket, Edge Trimmer & Online Crusher:

  • Air cooling roller rack, online edge-cutting knives, and immediate edge trim recycling unit fed directly back into the extruder hopper.

• Online Thickness Gauge: X-ray or optical thickness scanning system providing real-time feedback to the T-die lip.

• Dual-Station Winding System: Servo-driven friction or turret winder supporting automatic roll swapping and precise tension control.

• Central PLC Control System: Integrated Sie mens PLC interface providing one-key line speed acceleration, recipe storage, and remote diagnostic access.

• 5. Key Advantages of GWELL PET Sheet Extrusion Lines vs. Competitors

  When compared with standard industry suppliers, CHINA GWELL (金韦尔机械) delivers engineered advantages in energy conservation, material flexibility, and operational intelligence:

  1. Superior No-Crystallization & Non-Drying Technology

• GWELL Advantage: Utilizing a custom co-rotating twin-screw or planetary screw design with a high-degree vacuum system ($10text{ Pa}$), GWELL lines process 100% bottle flakes (RPET) or virgin PET directly without pre-drying.

• Competitor Gap: Traditional single-screw lines require 3 to 4 hours of pre-crystallization and dehumidification drying, consuming immense electrical energy and risking material discoloration.

• 2. Up to 35% Lower Energy Consumption Per Ton

• GWELL Advantage: By eliminating drying towers and combining direct-drive motors with high-efficiency barrel heating, GWELL machinery cuts energy consumption to industry-leading levels per ton of output.

• 3. Excellent Raw Material Adaptability (100% RPET Compatibility)

• GWELL Advantage: The specialized screw geometry handles mixed intrinsic viscosity (IV) raw materials, such as crushed post-consumer bottle flakes, without compromising sheet clarity or tensile strength.

• 4. Advanced Servo Control & One-Touch Line Synchronization

• GWELL Advantage: Fully synchronized servo drives across the extruder, gear pump, 3-roll stack, traction unit, and winder allow operators to accelerate or decelerate the entire line with a single button while maintaining consistent sheet thickness.

• 5. High Capacities & Flexible Layer Customization

• GWELL Advantage: Production capacities reach up to $1,500text{ kg/h}$ with widths up to $1,800text{ mm}$. GWELL provides multi-layer co-extrusion technology (such as ABA for high-ratio recycled cores or GAG for decorative films) with European-standard layer distributors.

Why Choose GWELL?

✅ ​Turnkey Solutions​ – From installation to after-sales support
✅ ​Global Installations​ – Trusted by 500+ clients across 30+ countries
✅ ​Fast ROI​ – High yield and low waste maximize profitability

​Ready to Boost Your Production?​​
​Contact Our Experts Today!​​

​Liam​
saled@gwell.cn | +86 15906224102

​Max​
salem@gwell.cn | +86 15906227399

PET sheet extrusion