Processing Machinery
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Excessive gels/gel particles in low density polyethylene extruded products
Problem Phenomenon
Transparent or translucent gel particles (gel particles) are visible in extruded films or products, affecting product appearance and transparency.
Gels are insufficiently plasticized or crosslinked resin particles.
Cause Analysis
(1) High molecular weight components in raw material not fully plasticized
(2) Barrel temperature too low, some resin not completely melted
(3) Insufficient screw mixing effect
(4) Raw material contains crosslinked or oxidized gels
(5) Filter screen mesh count insufficient, gels not intercepted
Solution
(1) Appropriately increase barrel temperature to the higher value within the 160-220°C range
(2) Optimize screw design, add mixing elements
(3) Increase 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
Key Takeaway
Gels are caused by insufficient plasticization or raw material quality problems; they need to be solved from temperature control, screw design, and raw material selection.
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