Injection Molding
4 조회수
Cracking caused by internal stress of high impact polystyrene products
문제 현상
Products crack during use or storage; the root cause is internal stress generated during processing.
원인 분석
(1) Injection speed too fast, molecular chain orientation produces orientation stress
(2) Holding pressure too high or holding time too long
(3) Mold temperature too low, melt rapidly cools producing thermal stress
(4) Uneven product wall thickness, stress concentration at thick-thin junctions
(5) Mechanical stress during demolding
해결 방법
(1) Reduce injection speed, adopt multi-stage injection
(2) Appropriately reduce holding pressure
(3) Increase mold temperature to the higher value within the 40-80°C range
(4) Optimize product design, uniform wall thickness, enlarge fillets at corners
(5) Ensure uniform demolding force
핵심 요약
Internal stress cracking is a manifestation of processing stress exceeding material strength.
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