1) The surface of the plastic part is foamed and the internal bulge is too high in moisture and volatile content in the plastic. Pre-drying and pre-heat treatment should be carried out.
2 The mold temperature is too high or too low. Should be adjusted appropriately.
3 molding pressure is too low. Should be properly improved. Generally, for every 1 mm increase in thickness, the molding pressure is increased by 2 MPa.
4 mold exhaust is poor. The exhaust conditions should be improved.
5 mold plastic compression rate is too large, too much air content. The preform should be pre-pressed.
6 Insulation time is not properly controlled. Should be adjusted appropriately. Generally, the holding time should be longer.
7 curing time is too short. Should be extended appropriately.
2) The surface of the plastic part is dark 1 The mold temperature is too low. Should be properly improved.
2 The surface of the mold cavity is rough. The cavity surface finish should be improved.
3 too much lubricant, should be appropriately reduced.
4 improper use of release agent. A suitable release agent should be used.
3) The surface of the plastic part is mixed with impurities in the molding compound. It should be completely removed.
The moisture and volatile content of the 2 molding compound is too high. Pre-drying and pre-heat treatment should be carried out.
3 The particle size of the raw material is very large, and the plasticization of the large particle resin is poorly adhered to the surface of the plastic part. A resin with a uniform particle size should be used.
4 The surface of the mold cavity is rough. It should be polished to improve the surface finish of the cavity.
5 The mold cavity is not clean. The cavity should be cleaned.
4) Plastic surface surface paste 1 mold temperature is too high. Should be appropriately reduced.
2 mold plastic pre-heat treatment is not appropriate. Prevent preheating from being insufficient or overheating. Preheating temperature and time should be based on optimum fluidity.
3 clamping speed is too slow. Should be accelerated as appropriate.
5) The surface of the plastic parts is not properly clamped. The mold should be clamped slowly under low pressure conditions. Generally, the mold can be closed after the filling is completed. When the punch does not touch the molding powder, it should be closed quickly; after touching the molding powder, it should be closed slowly.
2 The mold temperature is too high. Should be appropriately reduced.
3 mold plastic pre-heat treatment is not appropriate. High frequency preheating should be performed.
6) Surface flow marks on plastic parts 1 mold plastic is too fluid or too high in moisture and volatile content. The molding compound should be replaced or pre-dried and pre-heat treated.
2 improper use of release agent. Appropriate release agent types should be selected and the dosage should be appropriately reduced.
3 insufficient loading. When loading, the appropriate feeding method should be determined according to the shape of the plastic part and the structure of the mold. If it is not easy to fill, it should be loaded more or more times.
4 The timing of exhausting is improper or the time is too long. The timing and timing of the exhaust should be properly controlled.
7) Uneven color or discoloration of plastic parts The thermal stability of 1 molding plastic is poor. Should be replaced with new materials.
2 The molding temperature is too high, and the melt or colorant is decomposed by heat. The pressing temperature should be appropriately lowered.
3 mold plastic preheating is not good. Appropriate preheating methods, preheating time and temperature should be selected.
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Hebei Giant Metal Technology Co., Ltd. , https://www.wiremesh.pl