Material Drying
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Defects caused by insufficient drying before metallocene linear low-density polyethylene metallocene linear low-density polyethylene processing (variant: seasonal change scenario)
Problem Phenomenon
Silver streaks, bubbles and rough surfaces 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.
Especially during seasonal alternation and environmental changes, this problem is more prominent and requires focused attention.
Cause Analysis
(1) Raw material absorbs moisture (although metallocene linear low-density polyethylene has low water absorption, long-term exposure still absorbs water)
(2) Drying temperature is too low or drying time is insufficient
(3) Drying equipment failure or insufficient dehumidification capacity
(4) Dried raw material is left in a humid environment for too long and absorbs moisture again
(5) Regrind is not dried or insufficiently dried
(6) During seasonal alternation and environmental changes, process parameter fluctuations or equipment condition 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% (metallocene linear low-density polyethylene)
(3) Seal and store dried raw material, cover the hopper, and limit air exposure to no more than 2h
(4) Dry regrind the same as new material
(5) Control workshop ambient humidity below 60%
(6) And adjust parameters according to the environment; pay special attention to parameter stability during seasonal alternation and environmental changes
Key Takeaway
Insufficient drying is a common root cause of processing defects; a complete drying system and moisture content testing system need to be established.
In different production scenarios, targeted preventive measures need to be taken.
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