High polyolefin density composite film, processing device thereof and high-barrier self-standing bag with the same

Abstract

The utility model discloses a kind of high polyolefin specific gravity composite films, its processing device and the high barrier self-supporting bag with it.The composite film of the self-supporting bag includes: coextrusion film layer, high barrier film layer, heat-seal film layer, first adhesive layer and second adhesive layer;Coextrusion film layer is PA / PE multilayer coextrusion film, coextrusion film layer includes surface layer high-temperature-resistant PA layer, intermediate PA support layer and multiple PE material layers, PA thickness ratio in coextrusion film layer is not higher than 3:20, coextrusion film layer is bonded on high barrier film layer by first adhesive layer;High barrier film layer is VMBOPP film;Heat-seal film layer is PE film, heat-seal film layer is bonded below high barrier film layer by second adhesive layer;First adhesive layer and second adhesive layer are all polyurethane glue, dry adhesive coating amount is not higher than 2.5gsm;Composite film thickness ratio from top to bottom is as follows: coextrusion film layer: first adhesive layer: high barrier film layer: second adhesive layer: heat-seal film is 80:5:36:5:140.The utility model has the effect that product performance is good, meet recycling cycle standard and can be used in wide area.

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