Processing Machinery
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Random copolymer polypropylene pipe special material (Nordic standard） extruded products excessive gel/gel particles（Variant: Strengthened Measures）
Problembeschreibung
Transparent or translucent gel particles (gel particles) are visible in the extruded film or product, affecting product appearance and transparency.
Gels are insufficiently plasticized or crosslinked resin particles.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
Ursachenanalyse
（1）The high molecular weight fraction in the raw material is not fully plasticized\
（2）Barrel temperature too low, part of the resin not completely melted\
（3）Insufficient screw mixing effect\
（4）The raw material contains crosslinked or oxidized gel\
（5）The filter screen mesh count insufficient, gel not intercepted\
（6）On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
Lösung
（1）Appropriately increase the barrel temperature to the higher value within the 200-220°C range\
（2）Optimize screw design, add mixing elements\
（3）Increase the filter screen mesh count to 80-120 mesh\
（4）Select high-quality raw material with low gel content\
（5）Check whether crosslinked material is mixed into the regrind\
（6）And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
Wichtigste Erkenntnis
Gels are caused by insufficient plasticization or raw material quality problems, and need to be solved from temperature control, screw design and raw material selection.Targeted preventive measures need to be taken in different production scenarios.
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