Material Drying
4 조회수
Defects caused by insufficient drying before linear low-density polyethylene linear low-density polyethylene processing
문제 현상
Silver streaks, bubbles and rough surfaces appear on the product surface, and mechanical properties decline.
The consequences of insufficient drying cover multiple defect types and are a common problem in plastics processing.
원인 분석
(1) Raw material absorbs moisture (although linear low-density polyethylene has low water absorption, long-term exposure still absorbs water)
(2) Drying temperature is too low or drying time is insufficient
(3) Drying equipment failure or insufficient dehumidification capacity
(4) Dried raw material is left in a humid environment for too long and absorbs moisture again
(5) Regrind is not dried or insufficiently dried
해결 방법
(1) Use a dehumidifying dryer, drying temperature 60-80°C, time 2-4h
(2) Control moisture content after drying below 0.02% (linear low-density polyethylene)
(3) Seal and store dried raw material, cover the hopper, and limit air exposure to no more than 2h
(4) Dry regrind the same as new material
(5) Control workshop ambient humidity below 60%
핵심 요약
Insufficient drying is a common root cause of processing defects; a complete drying system and moisture content testing system need to be established.
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!