Material Drying
4 조회수
Defects caused by insufficient drying before processing of heat-resistant polyethylene heat-resistant polyethylene (Variant: strengthened measures)
문제 현상
Silver streaks, bubbles, and rough surface appear on the product surface, and the mechanical properties decrease.
The consequences of insufficient drying cover a variety of defect types and are a common problem in plastic processing.
In particular, extra attention is needed on the original basis, this problem is more prominent and needs key attention.
원인 분석
（1）The raw material absorbs moisture (although heat-resistant polyethylene has low water absorption, it still absorbs water after 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 left in a humid environment for too long and absorbs moisture again
（5）The regrind is not dried or is insufficiently dried
（6）On the original basis, extra attention is needed: process parameter fluctuations or equipment status changes have aggravated this problem
해결 방법
（1）Use a dehumidifying dryer, drying temperature 60-80°C, time 2-4h
（2）Control the moisture content after drying below 0.02% (heat-resistant polyethylene)
（3）Store the dried raw material sealed, cover the hopper, and expose to air for no more than 2h
（4）The regrind is dried in the same way as the new material
（5）Control the workshop environment humidity below 60%
（6）And strengthen process monitoring; on the original basis, extra attention is needed, with special attention to parameter stability
핵심 요약
Insufficient drying is a common root cause of processing defects, and a sound drying system and moisture content inspection system need to be established.
In different production scenarios, targeted preventive measures need to be taken.
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