CN214983908U

CN214983908U - Packaging film

Info

Publication number: CN214983908U
Application number: CN202121302506.XU
Authority: CN
Inventors: 方志雄; 张海龙; 孙云峰; 张海斌
Original assignee: Inner Mongolia Yili Industrial Group Co Ltd
Current assignee: Inner Mongolia Yili Industrial Group Co Ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2021-12-03
Anticipated expiration: 2031-06-10

Abstract

The embodiment of the application provides a packaging film, and belongs to the technical field of packaging. The packaging film comprises: the first co-extrusion film layer, the bonding layer and the second co-extrusion film layer are sequentially stacked from inside to outside; the first co-extrusion film layer is bonded with the second co-extrusion film layer through a bonding layer; the first co-extrusion film layer comprises a plurality of first sub-film layers which are arranged in a stacked mode, and the second co-extrusion film layer comprises a plurality of second sub-film layers which are arranged in a stacked mode; the plurality of first sub-film layers and the plurality of second sub-film layers are made of polyethylene materials; a density of a portion of the first sub-film layers in the plurality of first sub-film layers is less than a density of a portion of the second sub-film layers in the plurality of second sub-film layers. The polyethylene material is a recyclable material, so that the environment protection is facilitated, and the high-density outer co-extruded film layer can improve the tensile property of the packaging film and meet the external printing requirement; the inner layer co-extrusion film layer and the outer layer co-extrusion film layer of low density form the heat seal temperature difference, and then reduce the fold that produces at the heat seal in-process, make the heat seal level and smooth more, improve the tensile properties of packaging film.

Description

Packaging film

Technical Field

The embodiment of the application relates to the technical field of packaging, in particular to a packaging film.

Background

The food packaging film has relatively high performance requirements on the film, for example, the outer layer of the packaging film needs to have certain tensile property to meet the requirement of external printing; the packaging film is generally sealed by heat sealing technology, so that the heat sealing performance of the film per se is also required. The existing packaging film is difficult to simultaneously consider the tensile property and the heat sealing property of the film.

SUMMERY OF THE UTILITY MODEL

The purpose of this application embodiment is to provide a packaging film, can solve current packaging film and be difficult to compromise tensile properties and the heat sealability of membrane itself simultaneously.

In order to solve the technical problem, the present application is implemented as follows:

an embodiment of the present application provides a packaging film, includes: the first co-extrusion film layer, the bonding layer and the second co-extrusion film layer are sequentially stacked from inside to outside;

the first co-extrusion film layer is bonded with the second co-extrusion film layer through the bonding layer;

the first co-extrusion film layer comprises a plurality of first sub-film layers which are arranged in a stacked mode, and the second co-extrusion film layer comprises a plurality of second sub-film layers which are arranged in a stacked mode;

the plurality of first sub-film layers and the plurality of second sub-film layers are made of polyethylene materials;

a density of a portion of the first sub-film layers in the plurality of first sub-film layers is less than a density of a portion of the second sub-film layers in the plurality of second sub-film layers.

In one possible embodiment, the thickness of the first co-extruded film layer is 72 to 77 microns.

In one possible embodiment, the thickness of the second coextruded film layer is 22 to 27 microns.

In one possible embodiment, the plurality of first sub-film layers include a first metallocene polyethylene layer, a first high-density polyethylene layer, and a second metallocene polyethylene layer, which are sequentially stacked from inside to outside.

In a possible embodiment, the plurality of second sub-film layers include a first linear low density polyethylene layer, a third metallocene polyethylene layer, a fourth metallocene polyethylene layer, a second high density polyethylene layer, and a second linear low density polyethylene layer, which are sequentially stacked from inside to outside.

In the embodiment of the application, an inner and outer double co-extrusion film layer structure made of full polyethylene is adopted, the polyethylene material is a recyclable material, and the environment protection is facilitated, wherein the density of the outer co-extrusion film layer is greater than that of the inner co-extrusion film layer, so that the high-density outer co-extrusion film layer can improve the tensile property of the packaging film and meet the external printing requirement; the inner layer co-extrusion film layer and the outer layer co-extrusion film layer of low density form the heat seal temperature difference, and then reduce the fold that produces at the heat seal in-process, make the heat seal level and smooth more, improve the tensile properties of packaging film.

Drawings

Fig. 1 is a schematic structural diagram of a packaging film provided in an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The packaging film provided by the embodiment of the present application is described in detail by specific embodiments and application scenarios thereof with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present application provides a packaging film, including: the film comprises a first co-extrusion film layer 1, an adhesive layer 2 and a second co-extrusion film layer 3 which are sequentially stacked from inside to outside; the first co-extruded film layer 1 may also be referred to as an inner co-extruded film layer, and the second co-extruded film layer 3 may also be referred to as an outer co-extruded film layer.

The first co-extrusion film layer 1 is bonded with the second co-extrusion film layer 3 through an adhesive layer 2, wherein the adhesive layer 2 may be a composite adhesive or other types of adhesive layers, which is not specifically limited in the embodiment of the present application;

the first co-extrusion film layer 1 comprises a plurality of first sub-film layers (11-3 marked in the figure) which are arranged in a stacked mode, and the second co-extrusion film layer 3 comprises a plurality of second sub-film layers (31-35 marked in the figure) which are arranged in a stacked mode;

a plurality of first sub-retes and a plurality of second sub-retes are the Polyethylene (PE) material, and the packaging film of this application embodiment is the packaging film of full PE material promptly, adopts single material composite packaging film, replaces traditional composite packaging film of constituteing by multiple different material structures, and the PE material is recoverable material, does benefit to environmental protection.

The density of part of the first sub-film layers in the plurality of first sub-film layers is less than that of part of the second sub-film layers in the plurality of second sub-film layers, namely the density of the outer co-extrusion film layer is greater than that of the inner co-extrusion film layer.

In the embodiment of the application, an internal and external double co-extrusion film layer structure made of full polyethylene is adopted, wherein the density of the external co-extrusion film layer is greater than that of the internal co-extrusion film layer, so that the high-density external co-extrusion film layer can improve the tensile property of the packaging film and meet the external printing requirement; the inner layer co-extrusion film layer and the outer layer co-extrusion film layer of low density form the heat seal temperature difference, and then reduce the fold that produces at the heat seal in-process, make the heat seal level and smooth more, improve the tensile properties of packaging film.

In one possible embodiment, the thickness of the first co-extruded film layer 1 is 72 micrometers to 77 micrometers, and further, the thickness of the first co-extruded film layer 1 is 75 micrometers.

In one possible embodiment, the thickness of the second co-extruded film layer 3 is 22 to 27 microns, and further, the thickness of the first co-extruded film layer 1 is 25 microns.

In one possible embodiment, referring to fig. 1, the plurality of first sub-film layers includes a first metallocene Polyethylene layer 11, a first High Density Polyethylene (HDPE) layer 12, and a second metallocene Polyethylene layer 13, which are sequentially stacked from inside to outside.

In one possible embodiment, the plurality of second sub-film layers include a first Linear Low Density Polyethylene (LLDPE) layer 31, a third metallocene Polyethylene layer 32, a fourth metallocene Polyethylene layer 33, a second HDPE layer 34, and a second LLDPE layer 35, which are sequentially stacked from inside to outside.

Specifically, for the role of each sub-film layer:

first metallocene polyethylene layer 11: the innermost layer of the inner-layer co-extruded film is made of metallocene polyethylene, so that the temperature resistance is reduced, and the heat-seal temperature-resistant temperature difference is formed between the innermost layer and the second LLDPE layer 35 on the outermost layer, so that the problem of heat-seal wrinkles is reduced.

First HDPE layer 12: the inner layer co-extrusion film intermediate layer uses HDPE, promotes the packaging film stiffness.

Second metallocene polyethylene layer 13: the outermost layer of the inner layer co-extrusion film uses metallocene polyethylene, so that the tensile property of the packaging film is improved, and the heat sealing temperature is reduced.

First LLDPE layer 31: the innermost layer of the outer-layer co-extruded film is made of LLDPE, belongs to a high-temperature resistant material, and realizes high-temperature resistance.

Third metallocene polyethylene layer 32: the outer layer is a co-extruded film fourth layer, metallocene polyethylene is used, and the tensile property of the packaging film is improved.

Fourth metallocene polyethylene layer 33: the outer layer is a co-extruded film, and the third layer is metallocene polyethylene, so that the tensile property of the packaging film is improved.

Second HDPE layer 34: the outer coextrusion film second layer uses HDPE, promotes the packaging film deflection.

Second LLDPE layer 35: LLDPE is used as the outermost layer of the outer-layer co-extruded film, belongs to a high-temperature resistant material, and realizes high-temperature resistance.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A packaging film, comprising: the first co-extrusion film layer, the bonding layer and the second co-extrusion film layer are sequentially stacked from inside to outside;

2. The packaging film of claim 1, wherein the first coextruded film layer has a thickness of 72 to 77 microns.

3. The packaging film of claim 1, wherein the second co-extruded film layer has a thickness of 22 to 27 microns.

4. The packaging film of claim 1, wherein the plurality of first sub-film layers comprise a first metallocene polyethylene layer, a first high-density polyethylene layer and a second metallocene polyethylene layer which are sequentially stacked from inside to outside.

5. The packaging film of claim 1, wherein the plurality of second sub-film layers comprise a first linear low density polyethylene layer, a third metallocene polyethylene layer, a fourth metallocene polyethylene layer, a second high density polyethylene layer, and a second linear low density polyethylene layer, which are sequentially stacked from inside to outside.