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Working Principle of PET Sheet Production Line

01 February, 2026

The PET sheet production line is an equipment used for manufacturing PET (polyethylene terephthalate) sheets. PET sheets are a high-performance plastic material with excellent transparency and mechanical strength, widely applied in food packaging, medical devices, electronic products, and other fields.

The PET sheet production line mainly consists of a raw material conveying system, extruder, melt filter, extrusion die, three-roll calender, cooling system, cutting machine, and stacking machine.The entire production line process includes raw material conveying, extrusion, cooling, rolling, cutting, and stacking.

Firstly, PET raw materials are fed into the extruder through the raw material conveying system.The extruder heats the PET raw material and extrudes it through a screw to form a continuous melt. The melt is filtered through a melt filter to remove impurities, and then enters the extrusion mold.

Extrusion mold is one of the key components in PET sheet production line.Its design and manufacturing directly affect the quality and performance of the sheet material. Extrusion molds can produce PET sheets of different thicknesses, widths, and shapes by adjusting the structure and size of the mold. The cooling system in the extrusion mold can effectively control the temperature of the sheet and ensure the quality of the sheet.

The molten material at the exit of the extrusion mold is fed into a three roll rolling mill.The three roll rolling mill is a key equipment for rolling the melt into thin sheets. It consists of three parallel rollers, and by adjusting the spacing and speed of the rollers, the thickness and smoothness of the sheet can be controlled. During the rolling process, the sheet is rapidly cooled by a cooling system to solidify and maintain the desired shape.

The PET sheet after rolling is fed into the cutting machine.The cutting machine cuts the sheet into the desired size according to the set length and width. The cutting machine can achieve high-precision cutting through blade adjustment and precise control of the control system.

Finally, the cut PET sheets are fed into the stacker crane.The stacker crane stacks the sheets together and packages and marks them as needed. Stacker cranes can automatically adjust according to the speed of the production line and the size of the sheets, improving production efficiency and product quality.

In short, the PET sheet production line is an efficient, stable, and reliable equipment that can meet the needs of different industries for PET sheets. With the continuous advancement of technology and the increasing demand for high-performance plastic materials in the market, PET sheet production lines will play a more important role in future development.

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