Extrusion & Post
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Gel particles/gel appearing in polyolefin plastomer films
Problem Phenomenon
Transparent or translucent granular gel particles are visible in the film, affecting the appearance and transparency of the film.
Gel particles are resins that are not fully plasticized or cross-linked gel, which are particularly obvious in transparent films.
Cause Analysis
（1）The high molecular weight component in the raw material is not fully plasticized
（2）The extrusion temperature is too low
（3）The screw mixing effect is insufficient
（4）The raw material contains cross-linked gel
（5）The screen mesh is not enough
Solution
（1）Raise the extrusion temperature to the higher value within the range of 180-230°C
（2）Optimize the screw design and add mixing elements
（3）Select high-quality raw materials with low gel content
（4）Increase the screen mesh to 80-120 mesh
（5）Regularly clean the screw and die to prevent carbide generation
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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