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