Extrusion & Post
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Gel particles/gel particles in 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 insufficiently plasticized resin or crosslinked gels, especially obvious in transparent films.
Cause Analysis
(1) High molecular weight components in raw material not fully plasticized
(2) Extrusion temperature too low
(3) Insufficient screw mixing effect
(4) Raw material contains crosslinked gels
(5) Filter screen mesh count insufficient
Solution
(1) Increase extrusion temperature to the higher value within the 160-220°C range
(2) Optimize screw design, add mixing elements
(3) Select high-quality raw material with low gel content
(4) Increase filter screen mesh count to 80-120 mesh
(5) Regularly clean screw and die, prevent carbide formation
Key Takeaway
Gel particles are caused by insufficient plasticization or raw material quality problems; they need to be solved from temperature control and raw material quality.
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