Extrusion & Post
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LLDPE film multilayer coextrusion interface
Problem Phenomenon
Interface instability patterns appear between layers of the multilayer coextruded film.
Cause Analysis
Large melt viscosity differences between layers cause interface shear instability at the confluence; mismatched layer ratio and temperature also induce it.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Match the melt viscosity of each layer; ②adjust the layer ratio and temperature; ③optimize the feedblock design; ④stabilize the extrusion output of each layer.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Coextrusion interface stability relies on viscosity matching; the feedblock and process need coordinated optimization.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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