Extrusion & Post
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Linear low-density polyethylene film blocking/poor opening
Problem Phenomenon
Film layers stick together and are difficult to separate, affecting subsequent processing and use.
Poor opening is especially prominent in film winding and automatic packaging, reducing production efficiency.
Cause Analysis
(1) Linear low-density polyethylene film has high surface tension and large interlayer adhesion
(2) The film is wound at too high a temperature with insufficient cooling
(3) Winding tension is too large
(4) Lack of antiblocking agent
(5) Films that are too thin are more prone to blocking
Solution
(1) Add an appropriate amount of antiblocking agent (such as silica micropowder 0.1-0.5%)
(2) Ensure the film is fully cooled before winding; winding temperature does not exceed 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
Key Takeaway
Film blocking is caused by surface tension and temperature and needs to be solved by adding antiblocking agents and controlling winding conditions.
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