Generally speaking, the barrel, screw and check ring of the old injection molding machine mostly wear to different degrees, and the cooperation gap between them will be relatively large, especially the injection molding machine that often produces POM and PVC Big.
Due to the increased gap, during injection, part of the melt will flow back to the rear of the screw through the gap and be heated again and sheared. After repeated several times, the POM and PVC materials that are easy to age and decompose appear yellowed or even burned due to the heating time of the melt being too long, and the injection molded parts become brittle.
Usually when the above situation occurs in production, it is generally suspected that the thermostat of the injection molding machine is broken, but the result is that repairing the thermostat will definitely not help.
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