Extrusion & Post
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Metallocene linear low density polyethylene film gel particles/gel granules（Variant: Seasonal Change Scenario）
Fenómeno del problema
Transparent or translucent granular gel particles are visible in the film, affecting film appearance and transparency.
Gel particles are insufficiently plasticized resin or crosslinked gel, especially obvious in transparent films.In particular, when the environment changes during seasonal alternation, this problem is more prominent and requires key attention.
Análisis de la causa
（1） The high molecular weight fraction in the raw material is not fully plasticized\
（2） Extrusion temperature too low\
（3） Insufficient screw mixing effect\
（4） The raw material contains crosslinked gel\
（5） The filter screen mesh count is insufficient\
（6） When the environment changes during seasonal alternation, process parameter fluctuations or equipment status changes aggravate this problem
Solución
（1） Increase extrusion temperature to the higher value within the 190-260°C range\
（2） Optimize screw design, add mixing elements\
（3） Select high-quality raw material with low gel content\
（4） Increase the filter screen mesh count to 80-120 mesh\
（5） Regularly clean the screw and die to prevent carbide formation\
（6） And adjust parameters according to the environment, paying special attention to parameter stability when the environment changes during seasonal alternation
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.Targeted preventive measures need to be taken in different production scenarios.
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