Multi-layer co-extrusion composite film

Abstract

The utility model discloses a multi-layer co-extrusion composite film which comprises a heat sealing layer, a first nylon layer used for blocking oxygen molecules is arranged on one side of the heat sealing layer, and a first metallocene polyethylene layer used for enhancing the elastic tension of the initial section of the film is arranged on the side, away from the heat sealing layer, of the first nylon layer. A second metallocene polyethylene layer for enhancing the elastic tension of the middle section of the film is arranged on one side, far away from the first nylon layer, of the first metallocene polyethylene layer, and bonding layers are respectively arranged among the heat sealing layer, the first nylon layer, the first metallocene polyethylene layer and the second metallocene polyethylene layer. The heat sealing layer can play a role in solidifying and sealing during heating, the first nylon layer can play a good barrier role, the first metallocene polyethylene layer and the second metallocene polyethylene layer respectively endow the initial section of the film with large elastic tension and the middle section of the film with large elastic tension, the advantages of each film are fully utilized, coordination is enhanced, and the film has a good sealing effect. The multi-layer co-extrusion composite film has good heat sealing performance, barrier property and toughness.

Description

Technical Field

[0001] The utility model relates to a multi-layer co-extruded composite film.

Background Art

[0002] Composite films used for packaging drugs, foods, etc. need to effectively prevent oxygen permeation so that drugs, foods, etc. will not deteriorate due to oxidation by oxygen. Most existing composite films are formed by coating a certain thickness of organic layer on the surface of polyvinyl chloride film and then curing to form a barrier film. However, the barrier property of this barrier film is not good, and its toughness is poor. It is easy to be damaged during transportation and use, resulting in a decline in the quality of the packaged products or even deterioration, etc., and it is impossible to effectively guarantee the quality and service life of the products.

[0003] Therefore, the present utility model is precisely produced based on the above deficiencies.

Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a multi-layer co-extruded composite film with a simple structure, good barrier property and strong toughness.

[0005] The utility model is realized by the following technical solutions:

[0006] A multi-layer co-extruded composite film, characterized in that: it includes a heat-sealing layer 1, one side of the heat-sealing layer 1 is provided with a first nylon layer 2 for blocking oxygen molecules, the side of the first nylon layer 2 away from the heat-sealing layer 1 is provided with a first metallocene polyethylene layer 3 for enhancing the elastic tensile force at the starting section of the film, the side of the first metallocene polyethylene layer 3 away from the first nylon layer 2 is provided with a second metallocene polyethylene layer 4 for enhancing the elastic tensile force in the middle section of the film, and adhesive layers 5 are respectively provided between the heat-sealing layer 1, the first nylon layer 2, the first metallocene polyethylene layer 3 and the second metallocene polyethylene layer 4.

[0007] The multi-layer co-extruded composite film as described above, characterized in that: a second nylon layer 6 is provided between the first metallocene polyethylene layer 3 and the second metallocene polyethylene layer 4, and adhesive layers 5 are respectively provided between the first metallocene polyethylene layer 3, the second nylon layer 6 and the second metallocene polyethylene layer 4.

[0008] The multi-layer co-extruded composite film as described above, characterized in that: an antibacterial layer 7 is provided between the heat-sealing layer 1 and the first nylon layer 2, and adhesive layers 5 are respectively provided between the heat-sealing layer 1, the antibacterial layer 7 and the first nylon layer 2.

[0009] The multi-layer co-extruded composite film as described above, characterized in that: the heat-sealing layer 1 is made of high-pressure polyethylene.

[0010] The multi-layer co-extruded composite film as described above, characterized in that: the first metallocene polyethylene layer 3 is made of MVLDPE2010.

[0011] The multi-layer co-extruded composite film as described above is characterized in that the second metallocene polyethylene layer 4 is made of MVLDPE3518.

[0012] The multi-layer co-extruded composite film as described above is characterized in that the thickness ratio of the heat-sealing layer 1, the antibacterial layer 7, the first nylon layer 2, the first metallocene polyethylene layer 3, the second nylon layer 6 and the second metallocene polyethylene layer 4 is 5:1:1:2:1:2, and the thickness of the heat-sealing layer 1 is 50 microns.

[0013] Compared with the prior art, the present utility model has the following advantages:

[0014] 1. The present utility model uses the cooperation of the heat-sealing layer, the first nylon layer, the first metallocene polyethylene layer and the second metallocene polyethylene layer. The heat-sealing layer can play a role in solidifying the seal when heated. The first nylon layer has a good oxygen barrier effect and can play a good barrier role. The first metallocene polyethylene layer and the second metallocene polyethylene layer respectively endow the film with large elastic tensile force at the starting section and large elastic tensile force at the middle section of the film. By making full use of the advantages of each layer of the film and coordinating and enhancing, the multi-layer co-extruded composite film of the present utility model has good heat-sealing performance, barrier property and toughness.

Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the present utility model.

Detailed Embodiment

[0016] The present utility model will be further described below with reference to the drawings:

[0017] As Figure 1 shown, a multi-layer co-extruded composite film includes a heat-sealing layer 1. One side of the heat-sealing layer 1 is provided with a first nylon layer 2 for blocking oxygen molecules. The side of the first nylon layer 2 away from the heat-sealing layer 1 is provided with a first metallocene polyethylene layer 3 for enhancing the elastic tensile force at the starting section of the film. The side of the first metallocene polyethylene layer 3 away from the first nylon layer 2 is provided with a second metallocene polyethylene layer 4 for enhancing the elastic tensile force at the middle section of the film. Adhesive layers 5 are respectively provided between the heat-sealing layer 1, the first nylon layer 2, the first metallocene polyethylene layer 3 and the second metallocene polyethylene layer 4. The present utility model uses the cooperation of the heat-sealing layer 1, the first nylon layer 2, the first metallocene polyethylene layer 3 and the second metallocene polyethylene layer 4. The heat-sealing layer 1 can play a role in solidifying the seal when heated. The first nylon layer 2 has a good oxygen barrier effect and can play a good barrier role. The first metallocene polyethylene layer 3 and the second metallocene polyethylene layer 4 respectively endow the film with large elastic tensile force at the starting section and large elastic tensile force at the middle section of the film. By making full use of the advantages of each layer of the film and coordinating and enhancing, the multi-layer co-extruded composite film of the present utility model has good heat-sealing performance, barrier property and toughness.

[0018] Furthermore, a second nylon layer 6 is provided between the first metallocene polyethylene layer 3 and the second metallocene polyethylene layer 4, and adhesive layers 5 are respectively provided between the first metallocene polyethylene layer 3, the second nylon layer 6 and the second metallocene polyethylene layer 4. The provision of the second nylon layer 6 can further enhance the ability of the composite film to block oxygen molecules, preventing oxygen from entering the package and affecting the product shelf life.

[0019] Furthermore, an antibacterial layer 7 is provided between the heat-sealing layer 1 and the first nylon layer 2, and adhesive layers 5 are respectively provided between the heat-sealing layer 1, the antibacterial layer 7 and the first nylon layer 2. The antibacterial layer 7 can achieve a good isolation and sterilization effect on germs, improving the antibacterial performance of the composite film, and can be made of natural antibacterial agents, nano silver antibacterial agents, etc. The adhesive layer 5 in the present utility model is a technique commonly used by those skilled in the art, such as polyurethane adhesives.

[0020] Specifically, the heat-sealing layer 1 is made of high-pressure polyethylene and can play a role in solidifying the seal when heated.

[0021] Specifically, the first metallocene polyethylene layer 3 is made of MVLDPE 2010, and ExxonMobil Enable 2010 can be selected in specific implementations. The design of the first metallocene polyethylene layer 3 can enhance the elastic tensile force of the starting section of this winding film, enabling the film to withstand a large tensile force in the starting section.

[0022] Specifically, the second metallocene polyethylene layer 4 is made of MVLDPE 3518, and ExxonMobil Exceed 3518PA can be selected in specific implementations. The design of the second metallocene polyethylene layer 4 can enhance the elastic tensile force of the middle section of this winding film, enabling the film to withstand a large tensile force in the middle section. The cooperation of the first metallocene polyethylene layer 3 and the second metallocene polyethylene layer 4 gives this composite film high puncture resistance and tear resistance. When it is collided by an external object, the occurrence of the composite film breaking is reduced, minimizing the impact on the packaged object.

[0023] In the present utility model, the thickness ratio of the heat-sealing layer 1, the antibacterial layer 7, the first nylon layer 2, the first metallocene polyethylene layer 3, the second nylon layer 6 and the second metallocene polyethylene layer 4 is 5:1:1:2:1:2. If the thickness of the heat-sealing layer 1 is 50 microns, then the thickness of the antibacterial layer 7 is 10 microns, the thickness of the first nylon layer 2 is 10 microns, the thickness of the first metallocene polyethylene layer 3 is 20 microns, the thickness of the second nylon layer 6 is 10 microns, and the thickness of the second metallocene polyethylene layer 4 is 20 microns. Under the above thickness ratio, the overall heat-sealing performance, barrier property and toughness of this winding film are good, and the production cost is relatively low.

Claims

1. A multi-layer co-extruded composite film, characterized in that: It includes a heat-sealing layer (1). On one side of the heat-sealing layer (1), there is a first nylon layer (2) for blocking oxygen molecules. On the side of the first nylon layer (2) away from the heat-sealing layer (1), there is a first metallocene polyethylene layer (3) for enhancing the elastic tensile force at the starting section of the film. On the side of the first metallocene polyethylene layer (3) away from the first nylon layer (2), there is a second metallocene polyethylene layer (4) for enhancing the elastic tensile force in the middle section of the film. Adhesive layers (5) are respectively provided between the heat-sealing layer (1), the first nylon layer (2), the first metallocene polyethylene layer (3) and the second metallocene polyethylene layer (4).

2. The multilayer coextruded composite film according to claim 1, wherein: A second nylon layer (6) is provided between the first metallocene polyethylene layer (3) and the second metallocene polyethylene layer (4). Adhesive layers (5) are respectively provided between the first metallocene polyethylene layer (3), the second nylon layer (6) and the second metallocene polyethylene layer (4).

3. The multilayer coextruded composite film according to claim 2, wherein: An antibacterial layer (7) is provided between the heat-sealing layer (1) and the first nylon layer (2). Adhesive layers (5) are respectively provided between the heat-sealing layer (1), the antibacterial layer (7) and the first nylon layer (2).

4. The multi-layer co-extruded composite film according to claim 1, wherein: The heat-sealing layer (1) is made of high-pressure polyethylene.

5. The multilayer co-extruded composite film according to claim 1, wherein: The first metallocene polyethylene layer (3) is made of MVLDPE 2010.

6. The multilayer coextruded composite film according to claim 1, wherein: The second metallocene polyethylene layer (4) is made of MVLDPE 3518.

7. The multilayer coextruded composite film according to claim 2, wherein: The thickness ratio of the heat-sealing layer (1), the antibacterial layer (7), the first nylon layer (2), the first metallocene polyethylene layer (3), the second nylon layer (6) and the second metallocene polyethylene layer (4) is 5:1:1:2:1:2, and the thickness of the heat-sealing layer (1) is 50 microns.

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