Extrusion & Post
5 조회수
Gel particles/gel appearing in polyolefin plastomer films (Variant: Enhanced Measures)
문제 현상
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.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
원인 분석
（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
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
해결 방법
（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
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
핵심 요약
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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