Extrusion & Post
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LLDPE stretch film casting
Problem Phenomenon
LLDPE stretch film cast production has uneven thickness and unstable pre-stretch performance
Cause Analysis
The casting method produces LLDPE stretch film with uniform thickness and high transparency; three-layer coextrusion structure can balance puncture resistance and cling; casting lines suit high-ratio pre-stretch requirements
Solution
①Stretch film mainly uses casting method with three-layer coextrusion; ②design pre-stretch ratio according to machine-use requirements; ③closed loop of online thickness measurement and visual inspection; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Casting three-layer coextrusion is the mainstream process for LLDPE stretch film; pre-stretch performance is the core indicator of machine-use film; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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