Extrusion & Post
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Polyolefin plastomer film blocking/poor opening property
Problem Phenomenon
The film layers stick together and are difficult to separate, affecting subsequent processing and use.
Poor opening property is particularly prominent in film winding and automatic packaging, reducing production efficiency.
Cause Analysis
（1）The polyolefin plastomer film has high surface tension and large interlayer adhesion
（2）The film is wound at too high a temperature and the cooling is insufficient
（3）The winding tension is too large
（4）Lack of anti-blocking agent
（5）The film is too thin and more likely to stick
Solution
（1）Add an appropriate amount of anti-blocking agent (such as silica powder 0.1-0.5%)
（2）Ensure the film is fully cooled before winding, and the winding temperature does not exceed 40°C
（3）Appropriately reduce the winding tension
（4）Add an appropriate amount of slip agent (such as oleamide 0.1-0.3%) to reduce surface friction
（5）Control the film thickness within a reasonable range
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.
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