Water-blocking and oxygen-blocking recoverable barrel film

The seven-layer water- and oxygen-barrier recyclable cylindrical membrane solves the problem of decreased barrier performance of EVOH and HDPE composite membranes under high humidity. It achieves both moisture and oxygen permeability less than one, reasonable film thickness, good dart impact strength, and the cylindrical membrane is made of a single material, which facilitates recycling.

CN224545513UActive Publication Date: 2026-07-24SHANGHAI AILU PACKAGE
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Patent Information

Application Number
CN202521057094.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-27
Publication Date
2026-07-24
Estimated Expiration
2035-05-27

AI Technical Summary

Technical Problem

Existing EVOH and HDPE composite films exhibit decreased barrier performance in high humidity environments, increased film thickness, high cost, poor impact resistance, difficulty in achieving moisture and oxygen permeability of less than one, and are difficult to recycle.

Method used

The water- and oxygen-barrier recyclable tubular membrane adopts a seven-layer structure, including an LDPE layer, a composite layer, an adhesive layer, and an EVOH layer. The composite layer is composed of HDPE and POE, with HDPE containing 5% POE at a density of 0.97. The EVOH layer has an ethylene content of 32%, and the processing temperatures are 210℃ and 215℃, respectively. The tubular membrane is made of a single material.

Benefits of technology

It achieves a moisture permeability and oxygen permeability of less than one, possesses high barrier properties, has a reasonable film thickness, good dart impact strength, maintains excellent barrier properties and improves mechanical properties, and is suitable for recycling.

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Abstract

The utility model discloses a water-blocking oxygen-blocking recoverable barrel film, which belongs to the technical field of barrel films, and has the technical scheme that the recoverable barrel film comprises an LDPE (Low Density Polyethylene) layer, composite layers, bonding layers and an EVOH (Ethylene-Vinyl Alcohol) layer, the two sides of the EVOH layer are connected with the composite layers through the bonding layers, one side, far away from the EVOH layer, of each composite layer is connected with the LDPE layer, and the composite layers comprise HDPE (High Density Polyethylene) and POE (Polyolefin Elastomer). According to the scheme, moisture permeability and oxygen permeability are smaller than one, the film thickness is reasonably controlled while the high barrier property is achieved, the dart falling strength is good, the excellent barrier property is kept, and the mechanical property is improved.
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