Introduction of transparent plastic injection molding process

March 10, 2022

1. The characteristics of commonly used transparent raw materials

Because of the high light transmittance of transparent plastics, the surface quality of plastic products must be strict, and there should be no defects such as markings, pores, whitening, haze, black spots, discoloration, and poor gloss. Therefore, the raw materials, The design of equipment, molds, and even products must pay great attention to and put forward strict and even special requirements.

Secondly, because transparent plastics mostly have high melting point and poor fluidity, in order to ensure the surface quality of the product, it is often necessary to make fine adjustments to process parameters such as higher temperature, injection pressure, and injection speed, so that the mold can be filled without being filled with plastic. Will produce internal stress and cause product deformation and cracking.

Because transparent plastics mostly have high melting point and poor fluidity, in order to ensure the surface quality of the product, it is often necessary to make fine adjustments to process parameters such as higher temperature, injection pressure, and injection speed, so that the mold can be filled without Generate internal stress and cause product deformation and cracking.

2. Problems that should be paid attention to in process

In order to reduce internal stress and surface quality defects, the following issues should be paid attention to in the injection molding process.

• 1) The injection temperature should be at a higher injection humidity under the premise that the plastic resin does not decompose;

• 2) Injection pressure: generally higher to overcome the defect of high melt viscosity, but too high pressure will cause internal stress and cause difficult demoulding and deformation;

• 3) Injection speed: In the case of satisfying mold filling, generally it should be low, and it is better to use slow-fast-slow multi-stage injection;

• 4) Holding pressure time and molding cycle: under the condition that the product is filled with molds and does not produce dents or bubbles; it should be as short as possible to minimize the residence time of the molten material in the barrel;

• 5) Screw speed and back pressure: on the premise of meeting the plasticization quality, they should be as low as possible to prevent the possibility of degrading;

• 6) Mold temperature: The cooling of the product has a great impact on the quality, so the mold temperature must be able to accurately control the process. If possible, the mold temperature should be higher.

• 7) In order to prevent the deterioration of the surface quality, generally use as little release agent as possible during injection molding; when using recycled materials, it should not be more than 20%

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