CN218777255U

CN218777255U - Same-material recyclable composite film

Info

Publication number: CN218777255U
Application number: CN202223071682.4U
Authority: CN
Inventors: 陈岳锋; 周铁
Original assignee: Jiangsu Sunkey Packing High Tech Co Ltd
Current assignee: Jiangsu Sunkey Packing High Tech Co Ltd
Priority date: 2022-11-21
Filing date: 2022-11-21
Publication date: 2023-03-31
Anticipated expiration: 2032-11-21

Abstract

The utility model discloses a recoverable composite film made of the same material, which comprises an outer film and an inner film; the outer layer film is a biaxially oriented polyethylene film, and the inner layer film is a polyethylene film; the outer layer film and the inner layer film are bonded through a polyurethane composite adhesive layer; and the outer surface of the outer layer film is also provided with an anti-sticking gloss oil layer. The utility model discloses an outer heat-resisting performance layer and the high separation performance layer of inlayer have still adopted the same material as inlayer and outer combined material when having simplified comparatively complicated combined material structure in the current complex film, more make things convenient for recycle, have higher recycle value.

Description

Same-material recyclable composite film

Technical Field

The utility model belongs to the technical field of the packing, especially, relate to a recoverable complex film with material.

Background

At present, in the field of recycling of plastic wastes, a plurality of methods are available, the recycling rate of polyester bottles is high, in the aspect of recycling of plastic films, agricultural films are made of single polyethylene materials, but plastic films adopted in most industries are made of plastics of different materials in a compounding mode, the softening temperature, the mechanical strength and the like of the agricultural films are different, composite films made of the plastic materials and other materials in a compounding mode are further provided, such as composite materials of aluminum-plastic compounding, paper-plastic compounding and the like, recycling is difficult, the utilization value is not high, the agricultural films can only be used for injection molding parts or plastic mixed materials and used as injection molding materials, the mechanical strength is poor, even some composite materials cannot be used, only burning can be carried out, and environmental pollution is caused, and the existing recycling technology is not enough to separately recycle the composite materials of different materials. In addition, the composite film has wide application fields and large using amount, so the waste amount of the composite plastic film is also very large, and great pressure is caused on the environment.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a recoverable complex film of same material, including outer heat-resisting performance layer and the high separation performance layer of inlayer, when having simplified comparatively complicated combined material structure in the current complex film, still adopted the same material as inlayer and outer combined material, more convenient recycle has higher recycle value.

In order to realize the purpose, the utility model provides a recyclable composite film made of the same material, which comprises an outer layer film and an inner layer film;

the outer layer film is a biaxially oriented polyethylene film, and the inner layer film is a polyethylene film provided with a polyvinyl alcohol coating;

the outer layer film and the inner layer film are bonded through a polyurethane composite bonding layer;

preferably, the outer surface of the outer layer film is coated with an anti-sticking gloss oil layer.

Preferably, the thickness of the outer layer film is 25 to 70 μm.

Preferably, the thickness of the inner layer film is 30-110 μm.

Preferably, the water vapor transmission capacity of the inner film does not exceed 2.4 g/(m) ² 24 h), oxygen transmission not exceeding 0.65cm ³ /(m ² ·24h·0.1MPa)。

The utility model discloses a same material is as the outer and inlayer of complex film, and its softening temperature is close because be the same material, more makes things convenient for the recovery to recycle, can realize directly retrieving reprocessing, and its mechanical properties is good, can make disposal bag, high added value products such as express delivery parcel bag to but complete recycle can not cause the pollution to the environment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a process for producing a recyclable composite film made of the same material as disclosed in the present invention;

wherein:

1, sticking-resistant smooth oil layer; 2 biaxially oriented polyethylene film; 3, a polyurethane composite adhesive layer; 4, coating polyvinyl alcohol; 5 polyethylene film.

Detailed Description

The core of the utility model lies in providing a recoverable complex film with material, including outer heat-resisting performance layer and the high separation performance layer of inlayer, when having simplified comparatively complicated combined material structure in the current complex film, still adopted the same material as inlayer and outer combined material, more make things convenient for recycle, have higher recycle value.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring first to fig. 1, the recyclable composite film made of the same material disclosed in the present embodiment includes an anti-sticking gloss oil layer 1, a biaxially oriented polyethylene film 2, a polyurethane composite adhesive layer 3, a polyvinyl alcohol coating layer 4, and a polyethylene film 5. Wherein, the anti-sticking gloss oil layer 1, the two-way stretching polyethylene film 2, the polyurethane composite adhesive layer 3, the polyvinyl alcohol coating 4 and the polyethylene film 5 are arranged in sequence from outside to inside. An anti-sticking gloss oil layer 1 with anti-sticking function is coated on the outer surface, so that the adhesion problem of the composite film during heat sealing can be prevented; the biaxially oriented polyethylene film 2 has better heat sealing resistance; the polyvinyl alcohol coating 4 is coated between the polyurethane composite adhesive layer 3 and the polyethylene film 5 to achieve the purpose of high barrier property, and the barrier property of the polyethylene film 5 coated with the polyvinyl alcohol coating 4 can achieve the water vapor transmission capacity of 2.4 g/(m) ² 24 h), oxygen transmission 0.65cm ³ /(m ² ·24h·0.1MPa)。

In this example, the biaxially oriented polyethylene film 2 had a thickness of 25 to 70 μm, and the polyethylene film 5 had a thickness of 30 to 110 μm.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The recyclable composite film made of the same material is characterized by comprising an outer layer film and an inner layer film;

the outer film is a biaxially oriented polyethylene film, and the inner film is a polyethylene film provided with a polyvinyl alcohol coating;

the outer layer film and the inner layer film are bonded through a polyurethane composite adhesive layer;

2. the conformable composite film of claim 1, further comprising an anti-adhesive varnish layer applied to the outer surface of the outer film.

3. The composite recyclable film as defined in claim 1, wherein the outer layer has a thickness of 25 to 70 μm.

4. The composite recyclable film as defined in claim 1, wherein the inner layer has a thickness of 30 to 110 μm.

5. The composite recyclable film according to claim 1, wherein the inner film has a water vapor permeability of not more than 2.4 g/(m) ² 24 h), oxygen transmission not exceeding 0.65cm ³ /(m ² ·24h·0.1MPa)。