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