Extrusion & Post
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LDPE Film Draw Ratio Setting
Fenómeno del problema
The film's longitudinal-transverse strength is unbalanced or thickness is out of control, with the draw ratio deviating from the reasonable range.
Análisis de la causa
The draw ratio does not match the extrusion speed; too large over-stretches, too small causes accumulation; it is recommended to control it between 2:1 and 4:1.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solución
①Control the draw ratio at 2~4 times; ②Link with the blow-up ratio; ③Verify with measured film thickness distribution; ④Stabilize haul-off speed.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusión clave
The draw ratio is the main control parameter for longitudinal performance; measured verification is more reliable than pure calculation.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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