Tensile-resistant high-barrier co-extruded film and manufacturing method thereof

Abstract

The invention discloses a tensile-resistant high-barrier co-extruded film, comprising a surface PE layer, a modified PE layer, a PA layer, a modified PE layer, a PA layer, a modified PE layer, an intermediate PE layer, an intermediate PE layer, a surface PE layer which are bonded in sequence, or a symmetrical nylon film, a glue layer, a BOPA layer, a glue layer, a symmetrical nylon film which aresequentially bonded, or a symmetrical nylon film, a glue layer, a BOPA layer, a glue layer and an asymmetrical nylon film which are sequentially bonded; the symmetrical nylon film is prepared from a PE layer, a modified PE layer, a PA layer, a PA layer, a modified PE layer, a PE layer, a PE layer, a PE layer and a PE layer which are arranged in sequence through co-extrusion; the asymmetrical nylonfilm is prepared from a PE layer, a modified PE layer, a PA layer, a PA layer, a modified PE layer, a PE layer, a PE layer, a modified PE layer and a PA layer which are arranged in sequence through co-extrusion. The modified PE layer is arranged between each two PA layers, so that the PA layers with high strength are more uniformly dispersed in a 9-layer structure to bear force to increase the physical stability of a product; also, the BOPA layer can be compounded between original two symmetrical or asymmetrical nylon films to increase the tensile strength and barrier property of the film.

Description

technical field [0001] The invention relates to a stretch-resistant high-barrier co-extruded film and a manufacturing method thereof. Background technique [0002] At present, the multi-layer co-extrusion film on the market often has low tensile strength during use due to material selection and process reasons; the current production of co-extrusion film is basically a symmetrical PA (nylon) structure, specifically: PE / TIE / PA / PA / TIE / PE / PE / PE / PE (i.e. polyethylene layer / modified PE layer / nylon layer / nylon layer / modified PE layer / polyethylene layer / polyethylene layer / polyethylene layer / Polyethylene layer), the PE layer in existing products is general low density polyethylene + linear low density polyethylene, and there is no modified PE layer for transition between the middle layer PA, which affects the product mechanics to a certain extent performance, resulting in subsequent bag making or use, under the condition of applied tension, stretching occurs due to low strength, ...

AI Technical Summary

Problems solved by technology

It mainly solves the problem of subsequent recycling. There is only one layer of PA, the mechanical properties of the film are not good, and the tensile strength is not high. The buffer bag made of such a film is not strong and easy to leak

The authorized announcement number is CN 2020 53623 U patent: a multi-layer co-extrusion film that can block odor, which is a seven-layer co-extrusion film, and its order from top to bottom is: the first metallocene polyethylene layer, the first modified PE layer , EVOH layer, second modified PE layer, linear low density polyethylene layer, second metallocene polyethylene layer and third metallocene polyethylene layer; although the barrier property is good, its strength is not high