Line Process Flows

(1).Sheet Extrusion Line Process Flows

Extruder — Screen changer —–Melt pump —– T-die —— Calender —– Cooling bracket —– Haul-off— winder

 

Extruder: DWELL, a leading plastic extruder manufacturer in China, offers a single-screw extruder that requires only a crystallization unit. The screw is designed with a specialized mixing function and an advanced temperature control system, ensuring high plasticization, high output, and stable plastic extrusion.

Screen Change and T-Die: A hydraulic quick screen change device ensures fast, leak-free screen changes. The die structure is selected based on the material, with the hanger die head featuring a double-section flow design, which facilitates uniform flow distribution. This design allows for more precise thickness adjustment of the extruded plate.

Gear pump: The melt metering pump made of heat -resistant alloy steel is characterized by maintaining a constant flow unrelated to the discharge pressure to ensure the stable pressure and flow of solution.

Mold: It is made of heat-resistant alloy steel with a highly active throttling device, so that the material flow is evenly distributed in the die.

Three-Roller Calender: A 45° inclined, vertical, or horizontal three-roller calender is selected based on the plate thickness. Each roller has independent temperature control, with adjustable roller gaps. The middle roller’s adjustable angle, specially designed, ensures optimal calendering results and uniform plate (or sheet) thickness.

Cooling System: Equipped with dedicated cooling guide rollers to enhance the cooling effect. An edge-cutting device is also included to ensure consistent sheet (or plate) width and edge quality.

Winder: Features a high-torque motor and friction winding, allowing adjustable speed and winding tension. Other winding options are available to meet various requirements.

 

Key Features of Single Screw Dryer-Free Vented PET Sheet/Plate Extrusion Line:

  • . High Efficiency & Energy Saving: Dryer-free exhaust design eliminates pre-drying, saving energy.
  • . Excellent Plasticization: Specially designed screw structure ensures high plasticization efficiency and stable output.
  • . Precise Temperature Control: ±1°C temperature control ensures optimal processing conditions, preventing material degradation and ensuring high product quality, which results in PET sheets with higher transparency, smoothness, and strength.
  • High-Quality Output: Only need crystallization, the screw structure utmostly reduces the fall of viscosity of PET resin, keep the original tenacity of thick sheet. Maintaining consistent product quality, making the production line highly efficient and productive. Capable of processing large volumes of material at high speeds, making it suitable for large-scale production.
  • . Equipment Stability: High-torque motor and robust mechanical structure ensure stable, long-term production.
  • . Ease of Operation: Simplified production process and intelligent control system make the equipment easy to operate.

 

Characteristics and Advantages of PET Sheets:

  • .Crystal Clear Transparency: PET plastic stands out for its remarkable transparency, making it an excellent material for manufacturing clear packaging items like bottles, boxes, and containers.
  • . High Heat Resistance: With its ability to withstand elevated temperatures, PET plastic is ideal for packaging hot foods and beverages without risk of warping or breaking.
  • . Exceptional Strength and Durability

Known for its rigidity and mechanical strength, PET plastic ensures the production of long-lasting and sturdy products that can endure heavy use.

  • .Superior Chemical Resistance: PET plastic resists a broad range of chemicals, making it particularly well-suited for storing cosmetics, pharmaceuticals, and other chemical-sensitive products.
  • . Environmentally Friendly and Safe:As a non-toxic, odorless material with excellent hygienic properties, PET plastic is perfectly safe for direct food packaging applications.
  • .Excellent Electrical Insulation: PET plastic provides outstanding insulation against electricity and maintains its stability under varying temperature conditions.

 

Applications of PET SHEETS

PET sheets are versatile and widely used in various industries due to their excellent properties. Some common applications include:

(1). Packaging

PET sheets are extensively used in packaging, particularly for food and beverage packaging, due to their transparency, durability, and resistance to moisture. They provide excellent protection for products while offering high visibility for the consumer.

(2). Thermoforming

PET sheets are commonly used in thermoforming processes to create packaging trays, clamshells, and containers. Their ability to be heated and molded into different shapes makes them ideal for producing complex and precise shapes.

(3). Displays and Signage

PET sheets are often used for display and signage purposes because of their clarity, rigidity, and ease of fabrication. They are commonly used for point-of-sale displays, window signage, and promotional materials.

(4). Medical and Pharmaceutical Packaging

PET sheets are widely used in the medical industry for the packaging of sterile products and medical devices. Their chemical resistance and ability to maintain structural integrity make them a safe and reliable choice for healthcare applications.

(5). Industrial Applications

Due to their strength and durability, PET sheets are also used in various industrial applications, including protective covers, machine parts, and components that require high impact resistance.

 

Why Choose DWELL Machinery?

DWELL Machinery is a professional plastic extrusion machinery manufacturer in China that integrates production, processing, sales, and service. The company currently has two major production bases in Dongguan, Guangdong and Chuzhou, Anhui. The total area is about 100000 square meters, with over 200 technical and management personnel.

DWELL Machinery will continue to adhere to the quality policy and direction of “excellent quality, perfect as one”! Remember the core concept of “honesty towards others”, develop new products for the company, improve the quality of existing products, and continuously strive to provide after-sales service!