Molds & Tooling
6 조회수
Storage cracking/delayed cracking of high impact polystyrene PS products
문제 현상
PS products crack hours or days after processing, i.e., delayed cracking, caused by slow release of residual stress.
원인 분석
(1) Large residual stress in the product; stress releases over time causing cracking
(2) Uneven product wall thickness, large internal stress at thick walls
(3) Mold temperature too low, fast cooling rate, high residual stress
(4) Improper demolding, mechanical damage becomes crack source
(5) Ambient temperature changes accelerate stress release
해결 방법
(1) Increase mold temperature, reduce residual stress
(2) Optimize product design, uniform wall thickness
(3) Annealing treatment (60-80°C, 1-4h) to release stress
(4) Ensure uniform demolding force
(5) Store products in a constant temperature environment
핵심 요약
PS delayed cracking is caused by slow release of residual stress.
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!