Uniaxially stretched polyethylene composite film

Abstract

The utility model discloses a uniaxial stretching polyethylene composite film, which relates to the technical field of packaging bags, and comprises a longitudinal stretching polyethylene layer, the high-density polyethylene layer is located on the outer side of the longitudinal stretching polyethylene layer, the anti-ultraviolet film is located on the outer side of the high-density polyethylene layer, the inner layer is located on the inner side of the longitudinal stretching polyethylene layer, and a first adhesive layer is arranged between the anti-ultraviolet film and the high-density polyethylene layer. A second adhesive layer is arranged between the high-density polyethylene layer and the longitudinal stretching polyethylene layer, and a third adhesive layer is arranged between the longitudinal stretching polyethylene layer and the inner layer. The anti-ultraviolet packaging film has relatively good strength, toughness and barrier property, and also has an anti-ultraviolet effect.

Description

Technical Field

[0001] The present application relates to the technical field of packaging bags, and in particular to a uniaxially stretched polyethylene composite film. Background Art

[0002] Film packaging bags have the advantages of rich patterns, low packaging cost, light weight, and not easy to leak. Therefore, they are widely used in food, daily necessities, cosmetics, medical supplies and other fields. However, most of the packaging products on the market are made of a variety of composite materials. After being discarded, it is difficult to separate the materials and they cannot be recycled. A large amount of land is required to bury plastic waste or use incineration technology to treat plastic waste, which will cause serious environmental pollution problems and affect sustainable development. Therefore, single-material composite film is the current development trend of the industry. Among them, polyolefin materials are abundant in raw materials, low in price, easy to process and shape, and have excellent comprehensive performance. Therefore, they are the most used polymer materials. However, polyethylene film has a large air permeability, and oxygen or ultraviolet rays in the environment can easily cause the goods to deteriorate. In addition, polyethylene film is prone to static electricity during the feeding process, which will affect the packaging speed. Utility Model Content

[0003] In view of this, the present application provides a uniaxially stretched polyethylene composite film, which can utilize multiple polyethylene layers to be stacked, and add anti-ultraviolet films and antistatic agents to solve the technical problems of high air permeability and easy static electricity generation of polyethylene films.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A uniaxially stretched polyethylene composite film comprises a longitudinally stretched polyethylene layer, further comprising a high-density polyethylene layer located on the outside of the longitudinally stretched polyethylene layer, an anti-ultraviolet film located on the outside of the high-density polyethylene layer, and an inner layer located on the inside of the longitudinally stretched polyethylene layer, a first adhesive layer is provided between the anti-ultraviolet film and the high-density polyethylene layer, a second adhesive layer is provided between the high-density polyethylene layer and the longitudinally stretched polyethylene layer, and a third adhesive layer is provided between the longitudinally stretched polyethylene layer and the inner layer.

[0006] Furthermore, a printing layer is provided between the anti-ultraviolet film and the high-density polyethylene layer.

[0007] Furthermore, a high barrier coating is provided between the high-density polyethylene layer and the longitudinally stretched polyethylene layer.

[0008] Furthermore, the high barrier coating is formed by coating with polyvinyl alcohol.

[0009] Furthermore, the anti-ultraviolet film is made of polyethylene material, ultraviolet absorber and antistatic agent.

[0010] Furthermore, the inner layer is made of linear low-density polyethylene, low-density polyethylene, metallocene polyethylene and an antistatic agent.

[0011] Furthermore, the antistatic agent is alkylphenol polyoxyethylene ether phosphate potassium salt.

[0012] Furthermore, the first adhesive layer, the second adhesive layer and the third adhesive layer are all solvent-free glue or water-based glue.

[0013] It can be seen from the above technical solution that the advantages of the utility model are:

[0014] 1. The present application is provided with a longitudinally stretched polyethylene layer with good ductility, a high-density polyethylene layer with high barrier properties, and an inner layer with high rigidity and good toughness. The use of a single material enables the film to be better recycled and has better water-blocking, oxygen-blocking, and light-blocking properties.

[0015] 2. This application also has an anti-ultraviolet film, which can better block ultraviolet rays.

[0016] 3. Antistatic agent is also added in this application, which can prevent static electricity during use and carry out packaging use efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0018] Figure 1 This is a schematic diagram of the structure of this application.

[0019] Explanation of the reference numerals: anti-ultraviolet film 1, printing layer 2, first adhesive layer 3, high-density polyethylene layer 4, second adhesive layer 5, high-barrier coating 6, longitudinally stretched polyethylene layer 7, third adhesive layer 8, inner layer 9. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the implementation modes and the accompanying drawings. Here, the illustrative implementation modes and descriptions of the present application are used to explain the present application, but are not intended to limit the present application.

[0021] refer to Figure 1 ,like Figure 1As shown, this embodiment provides a uniaxially stretched polyethylene composite film, including a longitudinally stretched polyethylene layer 7, wherein it also includes a high-density polyethylene layer 4 located outside the longitudinally stretched polyethylene layer 7, an anti-ultraviolet film 1 located outside the high-density polyethylene layer 4, and an inner layer 9 located inside the longitudinally stretched polyethylene layer 7, a first adhesive layer 3 is provided between the anti-ultraviolet film 1 and the high-density polyethylene layer 4, a second adhesive layer 5 is provided between the high-density polyethylene layer 4 and the longitudinally stretched polyethylene layer 7, and a third adhesive layer 8 is provided between the longitudinally stretched polyethylene layer 7 and the inner layer 9. The use of the first adhesive layer 3, the second adhesive layer 5 and the third adhesive layer 8 can prevent the film from being delaminated. The stacking of the high-density polyethylene layer 4, the longitudinally stretched polyethylene layer 7 and the inner layer 9 can not only improve the strength, toughness and barrier properties of the film, but also conform to the concept of recyclable single materials. The high-density polyethylene layer 4 is located outside the longitudinally stretched polyethylene layer 7, and the high strength, heat resistance, oil resistance, chemical resistance and other characteristics of the high-density polyethylene layer 4 can better protect the longitudinally stretched polyethylene layer 7 and the inner layer 9.

[0022] In the embodiment of the present application, the first adhesive layer 3, the second adhesive layer 5 and the third adhesive layer 8 are all solvent-free glue or water-based glue. The use of solvent-free glue or water-based glue reduces the use of ethyl acetate and achieves the environmental protection concept of emission reduction. The two-component solvent-free glue 518 is used in the present utility model, which is produced by Bostik (Shanghai) Management Co., Ltd. and the model is HERBERTS-2K-LF 518 / H108.

[0023] In the embodiment of the present application, a printing layer 2 is further provided between the anti-ultraviolet film 1 and the high-density polyethylene layer 4. The printing layer 2 is used to display the design pattern, and the anti-ultraviolet film 1 is located outside the printing layer 2, which can also reduce the influence of ultraviolet rays on the pattern.

[0024] In the embodiment of the present application, a high barrier coating 6 is further provided between the high-density polyethylene layer 4 and the longitudinally stretched polyethylene layer 7. The provision of the high barrier coating 6 can ensure the overall barrier property of the film in the present application, and the film has better waterproof and gas barrier effects.

[0025] In the embodiment of the present application, preferably, the high barrier coating 6 is formed by coating with polyvinyl alcohol, so that the present application can better meet the concept of recyclable single material.

[0026] In the embodiment of the present application, the anti-ultraviolet film 1 is preferably formed by melt-blowing after blending polyethylene material, ultraviolet absorber and antistatic agent. The outer side of the film of the present application has anti-ultraviolet and antistatic effects, which can prevent the internal items from being disturbed by external ultraviolet rays, and can also prevent the outer side of the film of the present application from generating static electricity during use, and has a high use effect.

[0027] In the embodiment of the present application, the inner layer 9 is preferably made of linear low-density polyethylene, low-density polyethylene, metallocene polyethylene and an antistatic agent. Linear low-density polyethylene has the characteristics of high strength, good toughness, tear resistance, etc., low-density polyethylene has excellent water vapor barrier and oxygen barrier properties, and metallocene polyethylene has good ductility, good impact resistance and greater elongation at break, so that the inner layer 9 has excellent waterproof, gas barrier, strength and toughness properties, which can further extend the shelf life of the article.

[0028] In the embodiment of the present application, the antistatic agent is alkylphenol polyoxyethylene ether phosphate potassium salt.

[0029] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the embodiments of the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A uniaxially stretched polyethylene composite film, comprising a longitudinally stretched polyethylene layer (7), characterized in that: The invention also comprises a high-density polyethylene layer (4) located outside the longitudinally stretched polyethylene layer (7), an anti-ultraviolet film (1) located outside the high-density polyethylene layer (4), and an inner layer (9) located inside the longitudinally stretched polyethylene layer (7), wherein a first adhesive layer (3) is provided between the anti-ultraviolet film (1) and the high-density polyethylene layer (4), a second adhesive layer (5) is provided between the high-density polyethylene layer (4) and the longitudinally stretched polyethylene layer (7), and a third adhesive layer (8) is provided between the longitudinally stretched polyethylene layer (7) and the inner layer (9).

2. The uniaxially stretched polyethylene composite film according to claim 1, characterized in that: A printing layer (2) is also provided between the anti-ultraviolet film (1) and the high-density polyethylene layer (4).

3. The uniaxially stretched polyethylene composite film according to claim 1, characterized in that: A high barrier coating (6) is also provided between the high-density polyethylene layer (4) and the longitudinally stretched polyethylene layer (7).

4. The uniaxially stretched polyethylene composite film according to claim 3, characterized in that: The high barrier coating (6) is formed by coating with polyvinyl alcohol.

5. The uniaxially stretched polyethylene composite film according to claim 1, characterized in that: The first adhesive layer (3), the second adhesive layer (5) and the third adhesive layer (8) are all solvent-free glue or water-based glue.

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