Extrusion & Post
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Poor Thickness Uniformity of PU Extruded Film
Problem Phenomenon
PU extruded film transverse thickness deviation ±15%, exceeding the ±5% industry standard
Cause Analysis
Die flow channel design unreasonable causing uneven melt flow in the wide die; PU melt elasticity large, extrusion swell uneven; air ring cooling uneven
Solution
1) Use coat-hanger die design to ensure uniform transverse flow; 2) Fine-tune die gap ±0.02mm; 3) Optimize air ring air volume and angle for uniform cooling; 4) Add a small amount of low-elasticity resin to reduce swell difference
Key Takeaway
Film thickness uniformity requires coordinated optimization from three aspects: die design, gap adjustment and cooling
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