Introduction and application of PET resin injection molding technology

Introduction and application of PET resin injection molding technology

PET resin raw material is petroleum-based material, PET resin injection molding technology has increasingly tended to reach a mature level, for PET resin injection molding, it is necessary to control the injection mold temperature and resin temperature.

Main injection molding conditions of PET:

1. Temperature of injection molding cylinder.

PET molding temperature range is narrow, the temperature will directly affect the performance of the product. If the temperature is too low, plasticization is not good, so that the plastic parts appear sag, lack of materials and other defects; On the contrary, too high temperature will cause overflow, nozzle salivation, color darkening, mechanical strength decline, and even cause degradation.

2. Injection mold temperature.

Injection mold temperature directly affects the cooling rate and crystallinity of the molten material, and the properties of the plastic parts are different with different crystallinity. Usually, the mold temperature is controlled in 100~140℃, when forming thin-walled plastic parts, it is desirable to have a small value; When forming thick - wall plastic parts, the value should be large.

3. Injection pressure of injection molding.

The fluidity of PET melt is good, easy to form, usually using medium pressure, injection pressure determination, should consider the viscosity of PET, the type and number of packing, the location and size of the gate, the shape and size of the plastic parts, die temperature, injection molding machine type.

At present, PET resin injection molding technology is used in the following aspects:

1. Applied to injection molding products with high corrosion resistance requirements

Manufacture all kinds of chemical containers and parts with pure F4 resin, such as pipes, storage tanks, reaction kettle, equipment lining, valves, pump bodies, joints, filtration materials, separation materials and all products in contact with corrosive media.

2. Applied to injection molding products with high wear-resisting requirements

F4 is filled with wear-resistant modification treatment, which can be used for wear-resistant materials, such as rotation, static seal ring, piston ring, washer, disc, seat, bearing, bearing bush, slider, guide rail, etc

3. Applied to injection molding products with high insulation requirements

High temperature resistant and high frequency electrical insulation products are manufactured with pure F4 resin, such as high frequency insulators, high frequency cables, damp resistant cables, capacitor coils, motor groove insulation and integrated circuit boards.

Due to the hydrolysis caused by the reaction with water, material pre-drying equipment must be set up during the injection molding of PET resin. Therefore, it is necessary to improve the management level and implement the pre-drying of the master batch of molding materials. The mission of Fanstar is to master the core technology of injection molding production, communicate and analyze the technology before mold production with customers from the production needs of finished products, so that the mold delivery time is short, the service life is long, the rapid mass production and the finished product quality is excellent! Have the need of injection mold welcome to contact us!