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[Chemical Knowledge]：Manufacturing method and process of BOPET

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BOPET (biaxially oriented polyester film) is a kind of chemical raw material widely used in packaging, electronics, electrical, medical and other fields. Its manufacturing method mainly involves the preparation of polyester resin, film extrusion, two-way stretching and other processes. This article will introduce the manufacturing method of BOPET in detail.

1. polyester resin preparation

1. ingredients: the purified terephthalic acid (PTA) and ethylene glycol (EG) in accordance with a certain molar ratio into the ingredients tank, while adding the right amount of catalyst, stabilizer and other additives.
2. Esterification reaction: Under the condition of high temperature and high pressure, PTA and EG undergo esterification reaction to produce oligomers.
3. Polycondensation Reaction: The oligomer undergoes a polycondensation reaction under vacuum to produce a high molecular weight polyester resin. Extrusion

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2. Film 1. Melt Extrusion: A polyester resin is charged into an extruder, melted by heating, and extruded into a sheet form through a die.
2. Cooling and setting: The extruded sheet resin is rapidly cooled by a cooling device to form a preliminary film.

3. biaxial stretching

1. Longitudinal stretching: The initially cooled film is longitudinally stretched through a set of rollers to increase its length.
2. Transverse Stretching: The longitudinally stretched film is fed to a transverse stretcher and stretched transversely by air pressure or mechanical means to increase its width.

4. heat setting and winding

1. heat setting: after two-way stretching of the film into the heat setting zone, through high temperature heating to rearrange the molecular chain, improve the thermal stability of the film, mechanical properties and so on.
2. winding: the heat-set film is wound into a roll by the winding device to complete the manufacturing process of BOPET film.

The above is the basic manufacturing method of BOPET film. In the specific production process, it is necessary to adjust the process parameters according to the product requirements to ensure product quality. At the same time, the waste and waste gas generated in the production process also need to be treated to ensure environmental protection requirements.

In short, the manufacturing method of BOPET film involves multiple process links, and the process parameters of each link need to be strictly controlled to ensure product quality and production efficiency. With the continuous advancement of science and technology, the manufacturing technology of BOPET film is also constantly improving, providing more possibilities for applications in various fields.

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