Injection Molding
4 조회수
PETG injection molded part shrinkage rate too large
문제 현상
The shrinkage rate of PETG injection molded products exceeds 0.5%, and the dimensions deviate from the mold design.
원인 분석
Holding pressure and holding time insufficient, feeding inadequate, mold temperature high with large cooling shrinkage, processing temperature high with large specific volume.
해결 방법
Increase holding pressure (60-70% of injection pressure) and extend holding time; appropriately lower the mold temperature to 20-40°C; control melt temperature at 230-250°C.
핵심 요약
PETG is an amorphous material, and the shrinkage rate is mainly controlled by holding pressure and cooling.
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