Extrusion & Post
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Gel particles/gel appearing in linear low-density polyethylene film (variant: strengthened measures)
Fenómeno del problema
Transparent or translucent granular gel particles are visible in the film, affecting film appearance and transparency.
Gel particles are resin that is not fully plasticized or crosslinked gel, which is especially obvious in transparent films.
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) High molecular weight components in the raw material are not fully plasticized
(2) Extrusion temperature is on the low side
(3) Screw mixing effect is insufficient
(4) The raw material contains crosslinked gel
(5) The screen mesh count is insufficient
(6) On top of the original basis, additional attention is needed as process parameter fluctuations or equipment condition changes aggravate this problem
Solución
(1) Increase extrusion temperature to the higher value within the 190-250°C range
(2) Optimize screw design and add mixing elements
(3) Select high-quality raw materials with low gel content
(4) Increase the screen mesh count to 80-120 mesh
(5) Regularly clean the screw and die to prevent carbide formation
(6) And strengthen process monitoring; on top of the original basis, additional attention is needed to pay special attention to parameter stability
Conclusión clave
Gel particles are caused by insufficient plasticization or raw material quality problems and need to be solved from temperature control and raw material quality.
In different production scenarios, targeted preventive measures need to be taken.
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