Easy-cutting nylon EVOH high-barrier film and production method thereof

Abstract

The present invention relates to an easy-cutting nylon EVOH high-barrier film and a production method thereof. The nylon EVOH high-barrier film comprises a first PE film layer, a first adhesion film layer, a first PA film layer, a middle EVOH film layer, a second PA film layer, a second adhesion film layer and a second PE film layer, wherein the first PE film layer, the first adhesion film layer,the first PA film layer, the middle EVOH film layer, the second PA film layer, the second adhesion film layer and the second PE film layer sequentially contact and are molded through co-extrusion, thefirst PE film layer and the second PE film layer comprise metallocene polyethylene, linear polyethylene and high-pressure polyethylene, the first adhesion film layer and the second adhesion film layer comprise an adhesion resin, the first PA film layer and the second PA film layer comprise polyamide, and the middle EVOH film layer comprises an ethylene-vinyl alcohol copolymer. According to the present invention, the materials of each film layer are added to the material cylinder of a seven-layer co-extrusion film blasting machine, and melting, co-extrusion, film blasting and cooling shaping are performed to obtain the easy-cutting nylon EVOH high-barrier film; and the obtained easy-cutting nylon EVOH high-barrier film has advantages of extremely high barrier performance, excellent heat sealing performance and moderate friction coefficient, cannot produce adhesion and slipping during being cut, and is suitable for a high-speed packaging production line.

Description

technical field [0001] The invention belongs to the field of film materials, and in particular relates to an easily cut nylon EVOH high barrier film and a production method thereof. Background technique [0002] Since the mid-1990s, researchers began to focus on the research of transparent high-barrier composite films, that is, single-layer films such as PET, PA, PP, PE, EVOH, PVDC, etc. The production of high-barrier composite films, such as coating PVDC film, evaporated oxide film, EVOH resin co-extrusion film and other films, can be laminated once or more times to obtain a transparent high-barrier composite film. However, a large amount of compounding solvent remains in the transparent high-barrier film obtained by dry compounding, extrusion compounding and other processes, which will not only cause environmental pollution, but also cause high production costs. Patent CN102700210A discloses a seven-layer co-extruded transparent high-barrier film and its preparation metho...

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Problems solved by technology

However, a large amount of compounding solvent remains in the transparent high-barrier film obtained by dry compounding, extrusion compounding and other processes, which will not only cause environmental pollution, but also cause high production costs.

Patent CN102700210A discloses a seven-layer co-extruded transparent high-barrier film and its preparation method. Although the preparation method is more environmentally friendly, and the obtained transparent high-barrier film has good transparency and barrier performance, the heat-sealing strength of the film is relatively low. Weak, and not easy to be cut off on the packaging line, prone to sticking

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