Processing Machinery
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LDPE Film Transverse Tearing
Problem Phenomenon
The film has poor transverse tear strength, and the side edges easily crack after bag making
Cause Analysis
Insufficient blow-up ratio causes the transverse molecular chains to not fully extend; poor melt fluidity makes die output uneven; bidirectional mechanical properties are unbalanced; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Increase the blow-up ratio to 2-4 times to balance bidirectional performance; ② blend a small amount of LLDPE to improve melt strength; ③ check the uniformity of die output; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Transverse tear strength is opened up by the blow-up ratio; the 2-4 times range plus LLDPE blending is the standard combination; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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