Extrusion & Post
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LDPE Film Longitudinal Strength
Fenómeno del problema
The longitudinal tensile strength of the film is insufficient, and the packaging tears along the longitudinal direction during use
Análisis de la causa
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
Solución
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
Conclusión clave
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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