Extrusion & Post
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COC Extruded Sheet Gel Particles
Problem Phenomenon
Gel particles and fish-eye defects appear on the surface of COC extruded optical sheets, the optical inspection defect rate rises, and they still appear intermittently after material change and machine purging.
Cause Analysis
Trace crosslinked gel or contaminants in the raw material form gel particles during extrusion; insufficient screen precision or damage allows impurities to pass through; accumulated material in barrel dead spots degrades and falls off intermittently.
Solution
①Strengthen incoming inspection and sieving of raw materials; ②increase screen precision and replace regularly; ③clean the dead spots of screw and die; ④optimize the die flow channel to eliminate stagnation zones.
Key Takeaway
COC optical sheet gel particle prevention and control consists of three lines of defense: raw material, filtration and equipment; intermittent defects mostly originate from accumulated material in dead spots; screen management is a low-cost, high-yield measure.
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