Extrusion & Post
6 Aufrufe
Metallocene linear low density polyethylene film gel particles/gel granules（Variant: Startup Commissioning Scenario）
Problembeschreibung
Transparent or translucent granular gel particles are visible in the film, affecting film appearance and transparency.
Gel particles are insufficiently plasticized resin or crosslinked gel, especially obvious in transparent films.In particular, during new machine commissioning or the initial startup period, 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） Extrusion temperature too low\
（3） Insufficient screw mixing effect\
（4） The raw material contains crosslinked gel\
（5） The filter screen mesh count is insufficient\
（6） During new machine commissioning or the initial startup period, process parameter fluctuations or equipment status changes aggravate this problem
Lösung
（1） Increase extrusion temperature to the higher value within the 190-260°C range\
（2） Optimize screw design, add mixing elements\
（3） Select high-quality raw material with low gel content\
（4） Increase the filter screen mesh count to 80-120 mesh\
（5） Regularly clean the screw and die to prevent carbide formation\
（6） And do well in parameter recording and archiving, paying special attention to parameter stability during new machine commissioning or the initial startup period
Wichtigste Erkenntnis
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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