Extrusion & Post
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Poor thickness uniformity of PVA extruded film
Problembeschreibung
Transverse thickness deviation of PVA extruded film ±15%, exceeding the ±5% industry standard
Ursachenanalyse
Unreasonable die flow channel design, causing uneven melt flow in the wide die; PVA melt elasticity large, uneven extrusion swell; air ring cooling uneven
Lösung
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
Wichtigste Erkenntnis
Film thickness uniformity needs coordinated optimization from three aspects: die design, gap adjustment and cooling
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