Injection Molding
6 조회수
LLDPE '2079851475616104452 shrinkage and warpage
문제 현상
LLDPE injection molded parts warp less than LDPE, but control is still needed, with deformation at uneven wall thickness
원인 분석
LLDPE shrinkage 1.5-3% is lower than LDPE, with smaller warpage tendency; but wall thickness differences and uneven cooling still cause deformation; crystallinity of 55-65% determines shrinkage behavior
해결 방법
①Uniform wall thickness design; ②balanced layout of cooling channels; ③optimize density distribution with holding pressure curve; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
핵심 요약
LLDPE's low shrinkage reduces but does not eliminate warpage; uniform wall thickness and balanced cooling remain fundamental engineering; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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