Multi-layer co-extrusion film for packaging

Abstract

The utility model provides a multi-layer co-extrusion film for packaging, and relates to the field of co-extrusion films. The multi-layer co-extrusion film for packaging comprises a base layer, a blocking layer is fixedly connected to the surface of the base layer, a first nylon film is fixedly connected to the surface of the blocking layer, an adhesive resin layer is arranged outside the base layer, an aluminum foil layer is fixedly connected to the interior of the adhesive resin layer, and a second nylon film is fixedly connected to the interior of the aluminum foil layer. And the surface of the adhesive resin layer is fixedly connected with a second heat insulation layer. According to the multi-layer co-extrusion film for packaging, the first nylon film is high in tensile strength and tensile strength and large in moisture absorption performance, the moisture resistance of the co-extrusion film is improved, the overall tensile strength and tensile strength of the co-extrusion film are improved through the aluminum foil layer, sunlight irradiation can be reflected, damage of sunlight to food can be reduced, and the second heat insulation layer is good in heat insulation performance. External heat is isolated, the heat insulation capacity of the co-extrusion film is improved, food damage caused by high temperature is avoided, and the protection capacity of the co-extrusion film on food is improved.

Description

Technical Field

[0001] The utility model relates to a co-extruded film for packaging, in particular to a multi-layer co-extruded film for packaging, belonging to the technical field of co-extruded films. Background Art

[0002] Co-extruded film is a multi-layer film made by extruding one raw material onto another film or bonding different types of films together. This product is called composite film. Most composite films are made of plastic, but paper, metal foil or fabric can also be used. The basic requirement of composite film is that the layers must have good adhesion to ensure the overall mechanical properties of the package.

[0003] The utility model with patent number CN219749145U discloses a high barrier co-extruded stretch film, which relates to the technical field of co-extruded stretch film. The utility model includes a stretch film body, which includes an antibacterial layer, a first waterproof layer, a heat insulation layer, a second waterproof layer, a flame retardant layer and an anti-aging layer from bottom to top, wherein the antibacterial layer, the first waterproof layer, the heat insulation layer, the second waterproof layer, the flame retardant layer and the anti-aging layer are bonded to each other, a flame retardant mechanism is arranged on the flame retardant layer for flame retardancy of the stretch film body, and a wear-resistant mechanism is arranged on the anti-aging layer for increasing wear resistance. The utility model can greatly enhance the flame retardant performance of the stretch film body by arranging the flame retardant mechanism, and at the same time, the wear-resistant mechanism is arranged to effectively prevent the stretch film body from being worn and improve the service life.

[0004] In order to avoid damage to the packaging, a co-extruded film is used. Although the co-extruded film in the above patent increases the service life, it has poor sunlight barrier properties. If the packaged food is exposed to sunlight for a long time, it will be oxidized and cause spoilage, thereby shortening the shelf life of the food. For this reason, we provide a multi-layer co-extruded film for packaging to solve the above problems. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] The purpose of the utility model is to provide a multi-layer co-extruded film for packaging in order to solve the above-mentioned problem, so as to solve the problem that the co-extruded film in the reference document is difficult to block sunlight.

[0007] (II) Technical solution

[0008] The utility model is realized through the following technical scheme: a multi-layer co-extruded film for packaging.

[0009] It comprises a base layer, a barrier layer is fixedly connected to the surface of the base layer, a first nylon film is fixedly connected to the surface of the barrier layer, an adhesive resin layer is arranged outside the base layer, an aluminum foil layer is fixedly connected to the inside of the adhesive resin layer, and a second heat insulation layer is fixedly connected to the surface of the adhesive resin layer.

[0010] Preferably, an antibacterial layer is fixedly connected to the surface of the first nylon film, a first thermal insulation layer is fixedly connected to the surface of the antibacterial layer, and the first thermal insulation layer is made of polyethylene terephthalate, and bacteria inside the co-extruded film are disinfected through the antibacterial layer.

[0011] Preferably, an antistatic layer is fixedly connected to the surface of the first thermal insulation layer, and a waterproof bottom layer is fixedly connected to the surface of the antistatic layer, and the waterproof bottom layer is a polyethylene film. The first thermal insulation layer is used to isolate external heat sources and reduce the damage of high-temperature radiation to food.

[0012] Preferably, the barrier layer is made of ethylene-vinyl alcohol copolymer, and the second thermal insulation layer is made of polyethylene terephthalate. The second thermal insulation layer is used to isolate external heat sources and reduce the damage of high-temperature radiation to food.

[0013] Preferably, a wear-resistant outer film is fixedly connected to the surface of the second heat-insulating layer, and the material of the wear-resistant outer film is wholly aromatic polyester. The wear-resistant outer film improves the wear resistance of the multi-layer co-extruded film.

[0014] Preferably, a buffer layer is fixedly connected to the surface of the base layer, and the material of the buffer layer is polyethylene foam material. The buffer layer forms a buffer mechanism to further improve the impact resistance of the multi-layer co-extruded film.

[0015] Preferably, a second nylon film is fixedly connected to the surface of the buffer layer, and the surface of the second nylon film is fixedly connected to the adhesive resin layer, so that the rigidity of the co-extruded film is improved through the second nylon film, and the moisture-proof performance of the co-extruded film is improved.

[0016] The utility model provides a multi-layer co-extruded film for packaging, which has the following beneficial effects:

[0017] 1. The multi-layer co-extruded film for packaging has good density, high crystallinity and strong adhesion through the barrier layer, and improves the oil resistance, solvent resistance, abrasion resistance and gas barrier properties of the overall co-extruded film. Through the first nylon film, the tensile strength and tensile strength are relatively high, and the rigidity of the co-extruded film is improved. The moisture absorption is relatively large, and the moisture-proof performance of the co-extruded film is improved. Through the adhesive resin layer, the aluminum foil layer is fixed to the surface of the second thermal insulation layer. Through the aluminum foil layer, the tensile strength and tensile strength of the overall co-extruded film are improved, and sunlight can be reflected to reduce the damage of sunlight to food. Through the second thermal insulation layer, the external heat is isolated, the thermal insulation capacity of the multi-layer co-extruded film is improved, the damage to food caused by external high temperature is reduced, and the protection capacity of the multi-layer co-extruded film to food is improved.

[0018] 2. The multi-layer co-extruded film used for packaging can disinfect bacteria inside the co-extruded film through the antibacterial layer, thereby improving the protection ability of the co-extruded film for food. Polyethylene glycol terephthalate is a packaging film with relatively comprehensive performance, which effectively blocks the infrared light zone, has excellent heat resistance, cold resistance, good chemical resistance and oil resistance. Through the first thermal insulation layer, it isolates the external heat source and reduces the damage of high temperature radiation to food. Through the antistatic layer, it avoids the generation and transmission of static electricity and reduces the damage of high temperature radiation to food. The polyethylene film is moisture-proof and has low moisture permeability. Through the waterproof bottom layer, the water retention performance of food is improved.

[0019] 3. The multi-layer co-extruded film used for packaging has a waterproof bottom layer that effectively prevents external moisture from entering the interior of the package, thereby improving the ability to protect food. The second heat insulation layer isolates external heat sources and reduces the damage of high-temperature radiation to food. The wear-resistant outer film avoids damage to the multi-layer co-extruded film, improves the wear resistance of the multi-layer co-extruded film, and extends the service life of the multi-layer co-extruded film. The polyethylene foam material forms a buffer mechanism to further improve the impact resistance of the multi-layer co-extruded film. The second nylon film improves the rigidity of the co-extruded film, improves the moisture-proof performance of the co-extruded film, and improves the ability to protect food. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is an exploded schematic diagram of the bottom structure of the co-extruded film of the utility model;

[0022] Figure 3 This is an exploded schematic diagram of the surface structure of the co-extruded film of the utility model;

[0023] Figure 4 It is a schematic diagram of the explosion of the adhesive resin layer structure of the utility model.

[0024]

Main component symbol description

[0025] 1. Base layer; 2. Barrier layer; 3. First nylon film; 4. Antibacterial layer; 5. First thermal insulation layer; 6. Antistatic layer; 7. Waterproof base layer; 8. Buffer layer; 9. Second nylon film; 10. Aluminum foil layer; 11. Adhesive resin layer; 12. Second thermal insulation layer; 13. Wear-resistant outer film. DETAILED DESCRIPTION

[0026] The embodiment of the utility model provides a multi-layer co-extruded film for packaging.

[0027] See also Figure 1 and Figure 2 , including a base layer 1, a barrier layer 2 is fixedly connected to the surface of the base layer 1, and a first nylon film 3 is fixedly connected to the surface of the barrier layer 2. Through the barrier layer 2, the density is good, the crystallinity is high and the adhesion is strong, and the oil resistance, solvent resistance, abrasion resistance and gas barrier properties of the overall co-extruded film are improved. Through the first nylon film 3, the tensile strength and the tensile strength are high, and the rigidity of the co-extruded film is improved, and the moisture absorption is large, thereby improving the moisture-proof performance of the co-extruded film.

[0028] An antibacterial layer 4 is fixedly connected to the surface of the first nylon film 3, and a first thermal insulation layer 5 is fixedly connected to the surface of the antibacterial layer 4. The material of the first thermal insulation layer 5 is polyethylene terephthalate, and antibacterial powder is added inside the antibacterial layer 4. The antibacterial layer 4 can disinfect bacteria inside the co-extruded film to improve the protection ability of the co-extruded film for food. Polyethylene terephthalate is a packaging film with relatively comprehensive performance, which effectively blocks the infrared light region and has excellent heat resistance, cold resistance, good chemical resistance and oil resistance. The first thermal insulation layer 5 can isolate external heat sources to reduce the damage of high-temperature radiation to food.

[0029] An antistatic layer 6 is fixedly connected to the surface of the first thermal insulation layer 5, and a waterproof bottom layer 7 is fixedly connected to the surface of the antistatic layer 6, and the waterproof bottom layer 7 is a polyethylene film. Antistatic material is added inside the antistatic layer 6. The antistatic layer 6 can avoid the generation and transmission of static electricity and reduce the damage of high-temperature radiation to food. The polyethylene film is moisture-proof and has low moisture permeability. The waterproof bottom layer 7 can improve the water retention performance of food, effectively prevent external moisture from entering the package, and improve the ability to protect food.

[0030] See also Figure 3 and Figure 4An adhesive resin layer 11 is arranged on the outside of the base layer 1, an aluminum foil layer 10 is fixedly connected inside the adhesive resin layer 11, and a second thermal insulation layer 12 is fixedly connected to the surface of the adhesive resin layer 11. The aluminum foil layer 10 is fixed by the adhesive resin layer 11, so that the aluminum foil layer 10 is fixed on the surface of the second thermal insulation layer 12. The aluminum foil layer 10 improves the overall tensile strength and tensile strength of the co-extruded film, and can reflect sunlight to reduce the damage of sunlight to food. The second thermal insulation layer 12 isolates the external heat, improves the thermal insulation capacity of the multi-layer co-extruded film, reduces the damage of food caused by external high temperature, and improves the protection capacity of the multi-layer co-extruded film to food.

[0031] The material of the barrier layer 2 is ethylene-vinyl alcohol copolymer, and the material of the second thermal insulation layer 12 is polyethylene terephthalate. The second thermal insulation layer 12 is used to isolate external heat sources and reduce the damage of high temperature radiation to food.

[0032] A wear-resistant outer film 13 is fixedly connected to the surface of the second thermal insulation layer 12, and the material of the wear-resistant outer film 13 is wholly aromatic polyester. Since wholly aromatic polyester is highly crystallized, it is more compact and regular in structure, has good strength and rigidity in mechanical properties, and has high heat resistance. In addition to being able to withstand corrosion from acids, alkalis and other corrosive substances, it also has good acid and alkali resistance. The wear-resistant outer film 13 can avoid damage to the multi-layer co-extruded film, improve the wear resistance of the multi-layer co-extruded film, and extend the service life of the multi-layer co-extruded film.

[0033] A buffer layer 8 is fixedly connected to the surface of the base layer 1, and the material of the buffer layer 8 is polyethylene foam material. The polyethylene foam material forms a buffer mechanism to further improve the impact resistance of the multi-layer co-extruded film.

[0034] The surface of the buffer layer 8 is fixedly connected to a second nylon film 9, and the surface of the second nylon film 9 is fixedly connected to the adhesive resin layer 11. The second nylon film 9 improves the rigidity of the co-extruded film, improves the moisture resistance of the co-extruded film, and improves the food protection capability.

[0035] When the utility model is in use: the barrier layer 2 is used to improve the overall performance of the co-extruded film; the first nylon film 3 and the second nylon film 9 are used to improve the rigidity of the co-extruded film and the moisture-proof performance of the co-extruded film; the first heat-insulating layer 5 and the second heat-insulating layer 12 are used to effectively block the infrared light zone, isolate the external heat source, and reduce the damage of high-temperature radiation to food; the wear-resistant outer film 13 is used to avoid damage to the multi-layer co-extruded film, improve the wear resistance of the multi-layer co-extruded film, and extend the service life of the multi-layer co-extruded film; through the aluminum foil layer 10, the overall tensile strength and tensile strength of the co-extruded film are improved, and sunlight can be reflected to reduce the damage of sunlight to food; through the above devices, the influence of the external environment on food is reduced, and the protection ability of the multi-layer co-extruded film packaging to food is improved.

[0036] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A multi-layer co-extruded film for packaging, comprising a base layer (1), characterized in that: The surface of the base layer (1) is fixedly connected to a barrier layer (2), the surface of the barrier layer (2) is fixedly connected to a first nylon film (3), an adhesive resin layer (11) is arranged outside the base layer (1), the interior of the adhesive resin layer (11) is fixedly connected to an aluminum foil layer (10), and the surface of the adhesive resin layer (11) is fixedly connected to a second heat insulation layer (12).

2. A multi-layer co-extruded film for packaging according to claim 1, characterized in that: An antibacterial layer (4) is fixedly connected to the surface of the first nylon film (3), a first heat-insulating layer (5) is fixedly connected to the surface of the antibacterial layer (4), and the material of the first heat-insulating layer (5) is polyethylene terephthalate.

3. A multi-layer co-extruded film for packaging according to claim 2, characterized in that: An antistatic layer (6) is fixedly connected to the surface of the first heat-insulating layer (5), and a waterproof bottom layer (7) is fixedly connected to the surface of the antistatic layer (6), and the waterproof bottom layer (7) is a polyethylene film.

4. The multi-layer co-extruded film for packaging according to claim 1, characterized in that: The material of the barrier layer (2) is ethylene-vinyl alcohol copolymer, and the material of the second heat insulation layer (12) is polyethylene terephthalate.

5. The multi-layer co-extruded film for packaging according to claim 1, characterized in that: A wear-resistant outer film (13) is fixedly connected to the surface of the second heat-insulating layer (12), and the material of the wear-resistant outer film (13) is wholly aromatic polyester.

6. The multi-layer co-extruded film for packaging according to claim 1, characterized in that: A buffer layer (8) is fixedly connected to the surface of the base layer (1), and the material of the buffer layer (8) is polyethylene foam material.

7. A multi-layer co-extruded film for packaging according to claim 6, characterized in that: The surface of the buffer layer (8) is fixedly connected to a second nylon film (9), and the surface of the second nylon film (9) is fixedly connected to an adhesive resin layer (11).

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