Material Drying
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PC Extruded Sheet Bubbles
Fenómeno do problema
Extruded PC sheets have bubbles and gel particles, uneven thickness and poor surface gloss
Análise das causas
Insufficient drying of the pellets vaporizes in the extruder to form bubbles; low molecular impurities in the raw material thermally decompose to produce gel particles; uneven die temperature causes thickness deviation and gloss difference
Solução
①Dehumidify and dry to a moisture content ≤0.02% before extrusion; ②sieve the raw material to remove impurities and control regrind; ③zone temperature control of the die and regularly clean the die lip buildup; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Conclusão principal
The quality baseline of PC sheet extrusion is still drying; gel particle and thickness problems point to raw material purity and die temperature control accuracy; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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