Extrusion & Post
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Linear low-density polyethylene film blocking/poor opening (variant: strengthened measures)
Fenómeno del problema
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.
Especially, additional attention is needed on top of the original basis; this problem is more prominent and requires focused attention.
Análisis de la causa
(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
(6) On top of the original basis, additional attention is needed as process parameter fluctuations or equipment condition changes aggravate this problem
Solución
(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
(6) And strengthen process monitoring; on top of the original basis, additional attention is needed to pay special attention to parameter stability
Conclusión clave
Film blocking is caused by surface tension and temperature and needs to be solved by adding antiblocking agents and controlling winding conditions.
In different production scenarios, targeted preventive measures need to be taken.
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