Molds & Tooling
4 조회수
PP Shrinkage 1.0-2.5 Management
문제 현상
[Problem Phenomenon] PP product dimensional deviation is large, shrinkage fluctuates obviously
원인 분석
PP shrinkage 1.0-2.5% is a wide range, greatly affected by wall thickness, holding pressure, mold temperature, and crystallization; directional (flow/transverse) differences are also obvious; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
해결 방법
Measure shrinkage compensation according to grade and wall thickness; lock mold temperature and holding pressure; glass fiber grades have lower shrinkage; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
핵심 요약
PP shrinkage 1.0-2.5% is a wide range; actual measurement compensation and locked process; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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