Extrusion & Post
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MP extruded film poor thickness uniformity
Problem Phenomenon
MP 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; MP melt elasticity large, extrusion swell uneven; air ring cooling uneven
Solution
1) adopt a coat-hanger die design to ensure uniform transverse flow; 2) fine-adjust 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 die design, gap adjustment and cooling
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