Processing Machinery
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EVA film heat-sealing window is narrow
Problem Phenomenon
EVA heat-sealing window only 5°C, 125-130°C, unstable
Cause Analysis
High VA content with low melting temperature and narrow window; equipment temperature control ±3°C exceeding
Solution
1) VA15-18% moderate, widening to 10°C; 2) Temperature control ±1°C; 3) Film ±5%; 4) Reduce speed to increase contact time
Key Takeaway
Narrow EVA heat-sealing window is caused by high VA; moderate VA and precise temperature control are key
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