The drying-free PET sheet production line is one of our main products.

The workflow is introduced below:

First, we pour the PET broken bottle flakes into the screw feeder, and the raw materials are transported to the extruder hopper by the screw feeder. Because the hopper is equipped with a material level meter, it can ensure that there is always material in the hopper.

Then the raw materials in the hopper are quantitatively transported to the extruder barrel through the feeder, and the raw materials are melted and transported forward through the twin-screw extruder. When entering the first vacuum port, about 95% of the moisture in the raw material is extracted. After experiencing the second and third vacuum ports, the PET has reached a 100% anhydrous state, thereby ensuring the viscosity of PET and ensuring the PET mterial quality.

Then the raw material passes through the screen changer to filter out dust, and then enters the melt pump. After being extruded with quantitative constant pressure by the melt pump, it enters the mold. After passing through the mold, the sheet is formed and extruded.

After the sheet comes out of the mold, it enters the three-roller calender for cooling and pressing. The thickness of the sheet is adjusted by adjusting the gap between the two rollers. The qualified sheet is cut by the edge cutting device to ensure the width of the sheet.

Lastly, the sheet is pushed forward on the roller and enters the double-sided silicon oil coating machine. The surface of the sheet is evenly coated with silicone oil or anti-static liquid. Applying silicone oil can ensure that the product can be easily separated from the mold during thermoforming. come out. Applying anti-static liquid can effectively prevent static electricity on the product. Users can easily choose to use it according to their needs. The subsequent sheets enter the infrared oven for drying, then pass through the traction device, and finally enter the constant tension winder.

Advantage:

1. Parallel co-rotating twin-screw extruder, twin-screw one-step extrusion, truly free of drying. the extruder can obtain high-output and high-quality PET sheets at low temperatures and low speeds. The GS75 model has a main motor of 132kW and its output can reach a maximum of 400kg/h.

2. Super powerful vacuum system. Vacuum systems are mainly used to remove moisture and volatile substances from PET. It adopts advanced Siemens PLC and HMI centralized control. Ensure that the machine can operate stably under an absolute vacuum of less than 100Pa, which can reduce the viscosity of PET by less than 0.03. Continuous multi-stage large-opening vacuum truly eliminates wet drying and saves 40% of energy consumption.

3. Extra large filtering area and non-stop screen changer. The filter area of the screen changer is 1200cm2, ensuring that no residue waste is stored in the final particles, while the filter area of the average filter in the industry is only 150cm2. At the same time, there is no need to stop the machine when changing the screen, ensuring the stable operation of the machine.

4. The roller of the three-roller calender adopts spiral flow channel design, which can effectively ensure that the surface temperature accuracy of the roller is within ±1°C. The rollers are made of high-quality steel and the three rollers are driven by servo motors.

5. The entire production line runs fully automatically and is very convenient to operate.