Processing Machinery
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Improper LDPE Film Blow-up Ratio
Problem Phenomenon
The film has low transverse strength or the bubble is frequently unstable, with the blow-up ratio deviating from the recommended range.
Cause Analysis
A blow-up ratio that is too small gives insufficient transverse orientation, while one that is too large makes the bubble unstable and easy to break; films for different uses have their own optimal blow-up ratio window.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Set the blow-up ratio at 2~4 times according to product requirements; ②Adjust in linkage with the draw ratio; ③When film breaks, lower the blow-up ratio first; ④Record verified parameter combinations.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
The blow-up ratio is the knob for distributing transverse and longitudinal performance; only by tuning it together with the draw ratio can balanced mechanical properties be obtained.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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