Extrusion & Post
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Film blocking/poor anti-blocking of homopolymer polypropylene film
Problem Phenomenon
Film layers stick together and are difficult to separate, affecting subsequent processing and use.
Poor anti-blocking is especially prominent in film winding and automatic packaging, reducing production efficiency.
Cause Analysis
(1) High surface tension of homopolymer polypropylene film, large interlayer adhesion
(2) Film wound at too high temperature, insufficient cooling
(3) Winding tension too high
(4) Lack of anti-blocking agent
(5) Film too thin, more prone to blocking
Solution
(1) Add appropriate anti-blocking agent (e.g., 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 appropriate slip agent (e.g., oleamide 0.1-0.3%) to reduce surface friction
(5) Control film thickness within a reasonable range
Key Takeaway
Film blocking is caused by surface tension and temperature; it needs to be solved by adding anti-blocking agents and controlling winding conditions.
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