The production equipment and process of biaxially stretched film are as follows, taking polyester (PET) as an example:
Ingredients and blends
The raw materials used in ordinary polyester films are mainly light PET chips and masterbatch chips. The masterbatch slice refers to the PET slice containing the additive, and the additives are silica, calcium carbonate, barium sulfate, kaolin, etc., and the corresponding masterbatch slice should be selected according to the different uses of the film. The polyester film is generally prepared by using a certain amount of silicon-containing masterbatch and light-slicing, and its function is to increase the microscopic roughness of the surface of the film by the distribution of the silica particles in the film, so that the film is wound between the films. Can hold a small amount of air to prevent film sticking.
The light slice and a certain proportion of the masterbatch slice are mixed by the metering mixer and then proceed to the next step.
Crystallization and drying
For high-viscosity-prone high polymers, such as PET, PA, PC, etc., pre-crystallization and drying are required before biaxial stretching. One is to increase the softening point of the polymer to avoid adhesion and agglomeration of the resin particles during drying and melt extrusion; the second is to remove the moisture in the resin and prevent the ester-containing polymer from undergoing hydrolytic degradation during melt extrusion. And generate bubbles.
Jiuzhi Plastics Network
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