Extrusion & Post
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LDPE Film Blocking and Difficult Opening
Problem Phenomenon
Film layers block after winding, the bag making machine has a high opening failure rate, and customers complain.
Cause Analysis
The resin is not dedicated for blown film or the anti-blocking agent is insufficient; high melt temperature makes the film surface sticky; large blow-up ratio, slow cooling, and fast haul-off all aggravate blocking.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Switch to blown-film-grade resin or add anti-blocking agent; ②Appropriately lower the extrusion temperature; ③Reduce the blow-up ratio; ④Increase air volume for fast cooling and slow down the haul-off.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Opening property is a hard requirement for bag making; combined adjustment of additives and process can balance efficiency and opening property.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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