Material Drying
4 조회수
HDPE Bubble Vacuum Void
문제 현상
Vacuum voids appear inside thick-wall products, with no sink marks on the surface but insufficient strength
원인 분석
The surface layer of HDPE thick-wall parts solidifies first to form a hard shell, and insufficient shrinkage compensation at the center forms vacuum voids; the absence of surface sink marks instead conceals internal defects; moisture bubbles need to be distinguished from vacuum voids
해결 방법
①Strengthen holding pressure compensation to the thick-wall center; ②enlarge the gate to delay freeze-off; ③verify pellet drying first for moisture bubbles; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
핵심 요약
HDPE vacuum voids are hidden defects; no sink marks does not mean no problem, and strength sampling inspection is the safety net; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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