Material Drying
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Metallocene linear low density polyethylene metallocene linear low density polyethylene defects caused by insufficient drying before processing
Fenómeno del problema
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.
Análisis de la causa
（1） The raw material absorbs moisture （although metallocene linear low density polyethylene 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
Solución
（1） Use a dehumidifying dryer, drying temperature 60-80°C, time 2-4h\
（2） Control moisture content after drying below 0.02% （metallocene linear low density polyethylene）\
（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%
Conclusión clave
Insufficient drying is a common root cause of processing defects, requiring the establishment of a sound drying system and moisture content testing system.
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