Extrusion & Post
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Metallocene linear low density polyethylene film blocking/poor opening（Variant: Startup Commissioning Scenario）
Problem Phenomenon
The film layers stick together and are difficult to separate, affecting subsequent processing and use.
Poor opening is particularly prominent in film winding and automatic packaging, reducing production efficiency.In particular, during new machine commissioning or the initial startup period, this problem is more prominent and requires key attention.
Cause Analysis
（1） Metallocene linear low density polyethylene film has high surface tension and large interlayer adhesion\
（2） Film wound up at too high temperature, cooling insufficient\
（3） Winding tension too large\
（4） Lack of anti-blocking agent\
（5） Film thickness too thin, more prone to blocking\
（6） During new machine commissioning or the initial startup period, process parameter fluctuations or equipment status changes aggravate this problem
Solution
（1） Add an appropriate amount of anti-blocking agent （such as silica fine powder 0.1-0.5%）\
（2） Ensure the film is fully cooled before winding, winding temperature not exceeding 40°C\
（3） Appropriately reduce winding tension\
（4） Add an appropriate amount of slip agent （such as oleamide 0.1-0.3%） to reduce surface friction\
（5） Control film thickness within a reasonable range\
（6） And do well in parameter recording and archiving, paying special attention to parameter stability during new machine commissioning or the initial startup period
Key Takeaway
Film blocking is caused by surface tension and temperature, and needs to be solved by adding anti-blocking agents and controlling winding conditions.Targeted preventive measures need to be taken in different production scenarios.
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