Molding Process
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Poor Thickness Uniformity of CMC Extruded Film
Problem Phenomenon
Transverse thickness deviation of CMC extruded film is ±15%, exceeding the ±5% industry standard
Cause Analysis
Unreasonable die flow channel design causes uneven melt flow in the wide die; CMC melt elasticity is large and die swell is uneven; air ring cooling is uneven
Solution
1)Adopt 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 needs coordinated optimization from three aspects: die design, gap adjustment and cooling
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