Extrusion & Post
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LDPE Blown Film Opening Property
Problem Phenomenon
The film is too sticky and difficult to open, and the film layers block and cannot be opened during bag making
Cause Analysis
The resin contains no antiblock agent or the content is low; melt temperature too high makes fluidity too large; blow-up ratio too large; insufficient cooling causes film layers to stick to each other under nip roller pressure; haul-off speed too fast
Solution
① Select grades containing antiblock agent or supplement antiblock masterbatch; ② lower the melt temperature; ③ fully cool before haul-off and winding; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Opening property is a basic function of the film; the three elements of antiblock agent, temperature, and cooling determine film layer separation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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