Processing Machinery
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LDPE Insufficient Longitudinal Strength
Fenómeno del problema
LDPE film has low longitudinal tensile strength
Análisis de la causa
Insufficient longitudinal draw ratio causes insufficient molecular orientation; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solución
Increase the haul-off ratio; match the blow-up ratio; select high-strength grades; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate the effective measure
Conclusión clave
Longitudinal strength relies on draw orientation design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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