Extrusion & Post
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LDPE Film Longitudinal Strength
Problem Phenomenon
The longitudinal tensile strength of the film is insufficient, and the packaging tears along the longitudinal direction during use
Cause Analysis
Haul-off ratio too small causes insufficient longitudinal molecular orientation; melt temperature too high causes molecular chain degradation; cooling rate too fast causes uneven crystallization; strength indicators cannot meet packaging requirements; 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 haul-off ratio to 1.5-3 times to enhance orientation; ② lower the barrel rear section temperature to prevent degradation; ③ adjust the frost line to optimize the cooling gradient; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Longitudinal strength is pulled by the haul-off ratio; the 1.5-3 times orientation range plus temperature protection naturally meets performance standards; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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