Material Drying
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Random copolymer polypropylene pipe special material (Nordic standard） Random copolymer polypropylene pipe special material (Nordic standard） defects caused by insufficient drying before processing（Variant: Strengthened Measures）
Problem Phenomenon
Silver streaks, bubbles and surface roughness 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.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
Cause Analysis
（1）The raw material absorbs moisture (although the random copolymer polypropylene pipe special material (Nordic standard） has low water absorption, long-term exposure still absorbs water)\
（2）Drying temperature too low or drying time insufficient\
（3）Drying equipment failure or insufficient dehumidification capacity\
（4）The dried raw material is left in a humid environment for too long and re-absorbs moisture\
（5）Regrind not dried or insufficiently dried\
（6）On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
Solution
（1）Use a dehumidifying dryer, drying temperature 60-80°C, time 2-4h\
（2）Control moisture content after drying below 0.02% (random copolymer polypropylene pipe special material (Nordic standard）)\
（3）Seal the dried raw material for storage, cover the hopper, exposure to air not exceeding 2h\
（4）Regrind dried the same as virgin material\
（5）Control workshop environment humidity below 60%\
（6）And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
Key Takeaway
Insufficient drying is a common root cause of processing defects, requiring the establishment of a sound drying system and moisture content testing system.Targeted preventive measures need to be taken in different production scenarios.
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