Processing Machinery
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Poor LDPE Film Transverse Tear
Problem Phenomenon
The transverse tear strength is significantly lower than the longitudinal, with unbalanced performance.
Cause Analysis
An insufficient blow-up ratio leaves the transverse molecular chains not fully extended; uneven die output also scatters transverse performance.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Increase the blow-up ratio to 2~4 times; ②Balance biaxial stretching; ③Check die uniformity; ④A small amount of LLDPE can be added to improve overall strength.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Transverse-longitudinal balance is the basic goal of film design; blow-up ratio adjustment combined with resin modification can quickly correct the imbalance.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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