Extrusion & Post
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Longitudinal streaks on PET extruded sheet
Problem Phenomenon
Continuous or intermittent streaks along the extrusion direction appear on the PET sheet surface, with uneven gloss.
Cause Analysis
The die lip has scratches or material buildup; the three-roll surface is damaged or contaminated; the melt is mixed with impurities or degradation products.
Solution
Clean and polish the die lip; clean and repair the three-roll surface; check raw material cleanliness and clean dead zones of the extrusion system.
Key Takeaway
PET sheet surface streaks are mostly caused by mechanical damage or contamination; regular maintenance is the key to prevention.
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