Coextrusion-lamination obstructing packaging film

Abstract

The invention discloses a coextrusion-lamination obstructing packaging film and belongs to the technical field of packaging materials. According to the coextrusion-lamination obstructing packaging film, the problems that an intermediate layer of an existing coextrusion film is relatively high in water absorption, the permeability resistance of barrier layers is reduced, the effective expiration date of a product is short, and meanwhile, due to structure arrangement of the intermediate layer PA of the coextrusion film and the single barrier layers at two sides of the intermediate layer, high barrier property and high coextrusion malleability property of the packaging film can not be simultaneously realized are solved. The packaging film comprises a BOPET (biaxially-oriented polyethylene terephthalate) film, an APET shading film, a first PE polyethylene film, a first PET polyester film, a first EVOH barrier layer, a PVDC gas barrier film, a second EVOH barrier layer, a second PET polyester film and a second PE polyethylene film, wherein the BOPET film, the APET shading film, the first PE polyethylene film, the first PET polyester film, the first EVOH barrier layer, the PVDC gas barrier film, the second EVOH barrier layer, the second PET polyester film and the second PE polyethylene film are co-extruded and compounded from outside to inside to form the packaging film. The packaging film disclosed by the invention is especially suitable for packaging fresh seafood, beef and dried tofu.

Description

technical field [0001] The invention relates to a co-extruded packaging film, in particular to a co-extruded composite barrier packaging film, which belongs to the technical field of packaging materials. Background technique [0002] At present, many aquatic products companies export seafood using co-extrusion film vacuum packaging. However, when the contents of the package are seafood products with high humidity, due to the high water absorption of the middle layer PA (nylon) of the co-extruded film, the barrier layer EVOH (ethylene / vinyl alcohol copolymer) can block the water under high humidity. The performance of the film has dropped sharply, which has seriously affected the overall barrier performance of the package and greatly shortened the effective shelf life of the product. The structural setting of the packaging film cannot realize the high barrier performance of the packaging film and the high co-extrusion ductility of the packaging film at the same time. Theref...

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Problems solved by technology

[0003] The purpose of this invention is to provide a kind of co-extruded composite barrier packaging film, to solve the problem that the water absorption of the existing co-extruded film middle layer PA is high, the barrier layer EVOH barrier property drops sharply, shortens the effective shelf life of the product, and at the same time Due to the structural setting of the middle layer PA of the co-extrusion film and the single barrier layer on both sides, it is impossible to achieve high barrier properties of the packaging film and high co-extrusion ductility of the packaging film at the same time

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