Molds & Tooling
10 조회수
PP Warpage from Uneven Crystallization
문제 현상
【Problem Phenomenon】PP flat plate frame parts warp and deform, poor assembly
원인 분석
PP is semi-crystalline with ordered crystallization, uneven cooling causes crystallinity differences leading to warpage; this is the most prominent defect of PP; uneven wall thickness and uneven mold temperature aggravate it; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
해결 방법
Uniform mold temperature ensures consistent crystallization; uniform wall thickness; symmetrical holding pressure; mold flow analysis to predict warpage; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
핵심 요약
The root of PP warpage is uneven crystallization, dual uniformity of mold temperature and wall thickness; 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 problems in the future
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