Material Drying
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Defects caused by insufficient drying of polyolefin plastomer polyolefin plastomer before processing
Fenómeno do problema
Silver streaks, bubbles, and rough surfaces appear on the product, and the mechanical properties decline.
The consequences of insufficient drying cover multiple defect types and are a common problem in plastics processing.
Análise das causas
（1）The raw material absorbs moisture (although the polyolefin plastomer has low water absorption, it will still absorb 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 placed in a humid environment for too long and absorbs moisture again
（5）The regrind is not dried or is insufficiently dried
Solução
（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 to below 0.02% (polyolefin plastomer)
（3）Seal and store the raw material after drying, cover the hopper, and do not expose it to air for more than 2h
（4）The regrind is dried in the same way as the new material
（5）Control the workshop environment humidity below 60%
Conclusão principal
Insufficient drying is a common root cause of processing defects, and a complete drying system and moisture content testing system need to be established.
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