Issues that should be paid attention to in the injection molding process (including the requirements of the injection molding machine) In order to reduce internal stress and surface quality defects, the following issues should be paid attention to in the injection molding process.
a) An injection molding machine with a dedicated screw and a separate temperature control nozzle should be used;
b) If the injection temperature does not decompose the plastic resin, a higher injection humidity should be used;
c) 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;
d) Injection speed: In the case of satisfying mold filling, generally it should be low, using slow-fast-slow multi-stage injection;
e) 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 melt in the barrel;
f) Screw speed and back pressure: on the premise of meeting the plasticization quality, it should be as low as possible to prevent the possibility of degrading;
g) Mold temperature: The cooling of the product has a great impact on the quality, so the mold temperature must be able to control the process. If possible, the mold temperature should be higher.
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