Material Drying
4 조회수
Decreased transparency/yellowing of high impact polystyrene SAN/AS products
문제 현상
SAN/AS product transparency is below standard or yellowing appears.
SAN is known for transparency and heat resistance.
원인 분석
(1) Processing temperature too high, material thermally degrades and yellows
(2) High raw material moisture content, microbubbles form in the product
(3) Regrind used multiple times, material ages and yellows
(4) Poor additive dispersion, affecting transparency
(5) Improper mold temperature, poor surface replication effect
해결 방법
(1) Control processing temperature within the 180-240°C range
(2) Fully dry raw material, moisture content ≤0.02%
(3) Control regrind ratio not exceeding 10%
(4) Use additives with good dispersibility
(5) Optimize mold temperature to the higher value within the 40-80°C range
핵심 요약
SAN transparency decrease is caused by thermal degradation or microbubbles.
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!