Processing Machinery
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PMMA Extruded Sheet Surface Gel Particles
Problem Phenomenon
Unplasticized gel particles and impurity spots appear on the sheet surface, reduced after filter screen replacement.
Cause Analysis
Impurities, carbonized spots or poorly plasticized particles in the raw material are extruded with the melt; damaged or insufficiently precise filter screens let impurities pass.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
①Improve filter screen precision and replace regularly; ②optimize plasticizing temperature; ③strengthen raw material cleanliness management; ④clean die head dead corners.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Gel particles affect the optical and appearance grade of sheets; dual control of filtration and plasticization, and high-precision multi-layer filtration is recommended for optical-grade sheets.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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