Extrusion & Post
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Gel particles/gel appearing in linear low-density polyethylene film
Problem Phenomenon
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.
Cause Analysis
(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
Solution
(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
Key Takeaway
Gel particles are caused by insufficient plasticization or raw material quality problems and need to be solved from temperature control and raw material quality.
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