Processing Machinery
6 مشاهدة
Excessive gel/gel particles in heat-resistant polyethylene extruded products
ظاهرة المشكلة
Transparent or translucent gel particles (gel particles) are visible in the extruded film or product, affecting product appearance and transparency.
Gels are resin particles that are not fully plasticized or crosslinked.
تحليل الأسباب
(1) High molecular weight components in raw material not fully plasticized
(2) Barrel temperature too low, part of resin not completely melted
(3) Screw mixing effect insufficient
(4) Raw material contains crosslinked or oxidized gel
(5) Screen pack mesh not enough, gel not intercepted
الحل
(1) Appropriately increase barrel temperature to the higher value within 190-230°C
(2) Optimize screw design, add mixing elements
(3) Increase screen pack mesh to 80-120 mesh
(4) Select high-quality raw materials with low gel content
(5) Check whether crosslinked material is mixed into the regrind
الخلاصة الأساسية
Gel is caused by insufficient plasticization or raw material quality problems, and needs to be solved from temperature control, screw design and raw material selection.
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