Processing Machinery
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HDPE film insufficient longitudinal strength
Problembeschreibung
The longitudinal tensile strength of the film is tested to be low, and it is easy to tear longitudinally after bag making.
Ursachenanalyse
A too small draw ratio causes insufficient longitudinal molecular orientation; too high melt temperature causes molecular chain breakage; too fast cooling and uneven crystallization also weaken the strength.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Lösung
①Increase the draw ratio to 1.5~3 times; ②lower the rear section temperature of the barrel to prevent degradation; ③adjust the frost line to optimize the cooling gradient; ④test the degree of orientation.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Longitudinal strength is jointly determined by orientation and molecular weight; draw ratio and temperature are the main process levers.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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