Extrusion & Post
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Gel Particles/Gel Appearing in High-Density Polyethylene Film
Problem Phenomenon
Transparent or translucent granular gel particles are visible in the film, affecting the film appearance and transparency.
Gel particles are insufficiently plasticized resin or cross-linked gel, and are particularly obvious in transparent films.
Cause Analysis
（1）The high-molecular-weight components in the raw material are not fully plasticized
（2）The extrusion temperature is low
（3）The screw mixing effect is insufficient
（4）The raw material contains cross-linked gel
（5）The filter screen mesh count is not enough
Solution
（1）Increase the extrusion temperature to a higher value within the 180-260°C range
（2）Optimize the screw design and add mixing elements
（3）Select high-quality raw materials with low gel content
（4）Increase the filter screen mesh count to 80-120 mesh
（5）Regularly clean the screw and die to prevent the generation of carbides
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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