Extrusion & Post
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CEF extrusion film thickness uniformity poor
Problem Phenomenon
The transverse thickness deviation of the CEF extruded film is ±15%, exceeding the ±5% industry standard
Cause Analysis
The unreasonable runner design of the die causes the melt to flow unevenly in the wide die; the CEF melt has large elasticity and the extrusion swell is uneven; the air ring cooling is uneven
Solution
1) Adopt a coat-hanger die design to ensure uniform transverse flow; 2) Fine-tune the die gap ±0.02mm; 3) Optimize the air volume and angle of the air ring to make the cooling uniform; 4) Add a small amount of low-elasticity resin to reduce the swell difference
Key Takeaway
Film thickness uniformity needs to be synergistically optimized from three aspects: die design, gap adjustment and cooling
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