Extrusion & Post
4 Aufrufe
COC Multilayer Co-extrusion Poor Interface
Problembeschreibung
COC multilayer co-extruded packaging film shows interlayer peeling, the bonding force between the barrier layer and the heat seal layer is insufficient, and the peel strength test is unqualified.
Ursachenanalyse
The polarity difference between COC and polyolefin layers is large, and the interface bonding of direct co-extrusion is weak; without a tie layer, the layers are bonded only by limited diffusion; processing temperature differences also affect interfacial fusion.
Lösung
①Add a maleic anhydride grafted adhesive resin layer between layers; ②optimize the processing temperature of each layer to match interfacial fusion; ③design the co-extrusion die flow channel to ensure uniform interlayer contact; ④online sampling of peel strength.
Wichtigste Erkenntnis
COC multilayer structures must be designed with a tie layer; interlayer bonding force relies on material matching rather than forced process adjustment; the co-extrusion temperature window must take into account the characteristics of each layer.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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