Material Analysis
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PC Extruded Sheet Surface Gel Particles
Problem Phenomenon
Tiny bright spots/gel particles appear on the PC sheet surface, failing optical inspection.
Cause Analysis
Unplasticized particles, degraded cross-linked matter, or foreign impurities mix into the melt; a broken screen or insufficient mesh count lets impurities through; PC's high-viscosity melt is difficult to plasticize, and unmelted spots are more likely to appear.
Solution
①Increase plasticizing temperature and mixing uniformity; ②Check and replace the screen pack; ③Clean die head dead corners; ④Control the cleanliness of raw material and regrind; ⑤Stabilize the plasticizing process.
Key Takeaway
PC gel particles are first divided into two categories: 'unplasticized and contamination': the former relies on plasticization and screens, the latter on cleaning and dead-corner treatment; optical sheets have extremely high requirements for melt uniformity.
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