Extrusion & Post
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LDPE Film Draw Ratio Setting
Problem Phenomenon
The film's longitudinal-transverse strength is unbalanced or thickness is out of control, with the draw ratio deviating from the reasonable range.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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