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