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Performance indicators of pet grid protective film slices

by:Skypro     2021-04-20
1. Viscosity

The viscosity of polyester slices used in the production of pet grid protective film is usually adjusted between 0.62dl/g-0.65dl/g. Viscosity reflects the relative molecular weight of polyester. Under the same conditions as other standards, the higher the viscosity, the greater the relative molecular weight. In the corresponding area, if the viscosity is reduced, the strength of the pet mesh protective film produced will also be reduced. However, if the viscosity is too high, the circulation of the polyester melt will be worse, and the material is very prone to vertical cross-sectional lines during casting. Affect the film formation and quality of the film.

2. Melting point

The melting point of the polyester slices used in the production of pet mesh protective film is usually adjusted to about 2,600 degrees Celsius, so the melting production process During the process, the adjustment of the melting processing temperature must be greater than two thousand sixteen degrees Celsius, otherwise it cannot be fully melted and extruded. The composition of DEG (ie diethylene glycol or monoglycol) affects the melting point of polyester. If the DEG composition is too high, the melting point of polyester will decrease. The pet mesh protective film produced is not resistant to high temperature and is easy to age. .

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