After the plastics injection molding, plastic parts out from the mold cavity, either using single or multiple pieces of ejection mechanism, the ejection is generally a one-time job. But sometimes because of the special shape plastic parts or the need of production automation, after completion of work in a mold release, still can’t take out from the mold plastic parts or can’t fall off automatically, while you must add a stripper to make plastic parts fall off. Demoulding difficult mainly because of gate or plastic squeeze within the mould.
The reason:
1.Equipment: top output was not enough.
2.mold
(1) the demoulding structure is unreasonable or improper position.
(2) draft was not enough.
(3) the mold temperature is too high or bad ventilation.
(4) the sprue wall or cavity surface is rough.
(5) nozzle and mould inlet does not break or inlet diameter of the nozzle diameter.
3. technological aspects
(1) the barrel temperature is too high or injection quantity too much.
(2) the injection pressure is too high or the pressure maintaining and cooling time is long.
4 aspects: raw material lack of lubricant.
Link to this article：reason of demoulding diffculty
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