High-barrier liquid packaging film

Abstract

The utility model discloses a high-barrier type liquid packaging film, which relates to the technical field of packaging materials and comprises a printing protection composite film, an outer PE (polyethylene) protection film, an EVOH (ethylene vinyl alcohol) high-barrier layer and an inner layer which are arranged from outside to inside, and bonding layers are arranged between the EVOH high-barrier layer and the inner layer and between the EVOH high-barrier layer and the outer PE protection film. According to the utility model, the printing protection composite film is arranged, and the outermost layer of the packaging film adopts the printing protection composite film made of a special material capable of resisting high-temperature cutting, so that the layer forms a first defense line for resisting physical wear and bearing process high temperature, and directly faces the thermal shock of a heat sealing cutter on a production line; due to the excellent heat-resistant characteristic of the plastic film, shrinkage, melting or peculiar smell generation at the moment of heat sealing and cutting is avoided, so that the smoothness and safety of the production process are ensured, meanwhile, patterns printed on the outer surface or below the plastic film are perfectly preserved in the subsequent sterilization and transportation process due to the firm surface of the plastic film, and wear and fading are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of packaging material, especially to a high-barrier type liquid packaging film. BACKGROUND

[0002] The existing liquid packaging, such as a boli bag, usually adopts a multilayer aseptic composite film structure, and such a packaging film needs to have good barrier property to prevent oxygen from permeating to cause oxidation of juice, thereby prolonging the shelf life. Meanwhile, the printed pattern on the outer layer of the packaging film is prone to discoloration or wear due to friction, high temperature and high humidity environment in subsequent sterilization treatment, storage and transportation, etc., affecting the product appearance and brand image.

[0003] In order to protect the printed pattern, the prior art sometimes considers adding a protective film, but the commonly used protective film material, such as ordinary polyester film (PET), has poor heat resistance and cannot adapt to the process requirements of high-temperature heat sealing cutting on the packaging production line. If it is forcibly used, it will cause the film to shrink, melt or produce odor, seriously affecting the production efficiency and product safety. In view of this, the present application further proposes a high-barrier type liquid packaging film based on the above technical problems. SUMMARY

[0004] The utility model discloses a high-barrier type liquid packaging film to solve the shortcomings in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A high-barrier type liquid packaging film, comprising a printed protective composite film, an outer layer PE protective film, an EVOH high-barrier layer and an inner layer arranged from outside to inside.

[0007] An adhesive layer is arranged between the EVOH high-barrier layer and the inner layer and between the EVOH high-barrier layer and the outer layer PE protective film.

[0008] The printed protective composite film material is a polyethylene terephthalate film or a nylon film.

[0009] Further, the outer surface of the outer layer PE protective film is provided with a printed pattern layer.

[0010] Further, the thickness of the outer layer PE protective film is 15-20 microns, and the outer layer PE protective film is a polyethylene protective film.

[0011] Further, the thickness of the EVOH high-barrier layer is 5-15 microns, and the EVOH high-barrier layer is an ethylene-vinyl alcohol copolymer layer.

[0012] Further, the adhesive layer is a polyurethane adhesive layer or a polyethylene modified adhesive resin layer.

[0013] Further, the inner layer has a thickness of 40-70 microns.

[0014] Further, the inner layer is a polyethylene heat-seal layer.

[0015] The present application has the following advantages:

[0016] 1. The present application is provided with a printing protection composite film, and the outermost layer of the packaging film is made of a special material that can withstand high temperature cutting. This layer forms the first line of defense against physical wear and tear and withstands high process temperature. It directly faces the heat shock of the heat-seal knife on the production line. Its excellent heat resistance ensures that it does not shrink, melt or produce odors during heat sealing and cutting, thereby ensuring smooth and safe production flow. At the same time, its strong surface also ensures that the patterns printed on its outer surface or below are well preserved during subsequent sterilization and transportation, avoiding wear and tear.

[0017] 2. The present application is provided with a PE protective film and an EVOH high barrier layer. The inner side of the printing protection composite film is an outer PE protective film, which mainly serves as a support and preliminary protection. The EVOH high barrier layer in the middle of the structure acts as an efficient barrier, greatly blocking the penetration of external oxygen, thereby effectively preventing the deterioration of easily oxidized liquid foods such as juice in the bag and significantly extending their shelf life. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The present application provides a high-barrier liquid packaging film structure diagram.

[0019] Figure 2 The present application provides a high-barrier liquid packaging film EVOH high barrier layer diagram.

[0020] In the figure: 1, printing protection composite film; 2, outer PE protective film; 3, EVOH high barrier layer; 4, inner layer; 5, adhesive layer; 6, printing pattern layer. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0022] REFERENCE Figures 1-2 A high-barrier liquid packaging film is provided, which comprises, from the outside to the inside, a printing protection composite film 1, an outer PE protective film 2, an EVOH high barrier layer 3, and an inner layer 4.

[0023] The EVOH high barrier layer 3 is provided with an adhesive layer 5 between the EVOH high barrier layer 3 and the inner layer 4 and between the EVOH high barrier layer 3 and the outer layer PE protective film 2.

[0024] The printed protective composite film 1 material is a polyethylene terephthalate film or a nylon film.

[0025] The outermost layer of the packaging film is a printed protective composite film 1 made of a polyethylene terephthalate film or a nylon film that can withstand high-temperature cutting. This layer constitutes the first line of defense against physical wear and tear and withstands high process temperatures, directly facing the heat impact of the heat-sealing knife on the production line. Its excellent heat resistance ensures that it does not shrink, melt, or produce odors during the instant of heat sealing and cutting, thereby ensuring smooth and safe production flow. Its strong surface also ensures that the patterns printed on its outer surface or below remain intact during subsequent sterilization and transportation, preventing wear and tear.

[0026] Referring to Figure 1 , specifically: the outer surface of the outer layer PE protective film 2 is provided with a printed pattern layer 6.

[0027] Referring to Figure 1 , specifically: the thickness of the outer layer PE protective film 2 is 15-30 μm, and the outer layer PE protective film 2 is a polyethylene protective film.

[0028] Referring to Figure 1 , specifically: the thickness of the EVOH high barrier layer 3 is 5-15 μm, and the EVOH high barrier layer 3 is an ethylene-vinyl alcohol copolymer layer that can greatly block the penetration of external oxygen, thereby effectively preventing the deterioration of easily oxidized liquid foods such as fruit juice in the bag and significantly extending their shelf life.

[0029] Referring to Figures 1-2 , specifically: the adhesive layer 5 is a polyurethane adhesive layer or a polyethylene modified adhesive resin layer. In order to firmly combine different material layers into one whole, a special adhesive layer 5 is provided between the EVOH high barrier layer 3 and the outer layer PE protective film 2, as well as between the EVOH high barrier layer 3 and the inner layer 4. These adhesive layers 5 ensure the structural integrity and reliability of the composite film during high-speed processing and use.

[0030] Referring to Figure 1 , specifically: the thickness of the inner layer 4 is 40-70 μm.

[0031] Referring to Figure 1 , specifically: the inner layer 4 is a polyethylene heat-sealing layer that directly contacts the packaging contents. During the packaging and bag-making process, it is melted by heat to complete the sealing, forming a sanitary and sealed packaging container. Its thickness and material properties also ensure the reliability of the heat-sealing strength.

[0032] Working principle: the outermost layer of the packaging film is a printed protective composite film 1 made of special material that can withstand high temperature cutting, which constitutes the first line of defense against physical wear and withstands high process temperature, directly facing the heat impact of the heat sealing knife on the production line, its excellent heat resistance ensures that it will not shrink, melt or produce odor during heat sealing and cutting, thereby ensuring smooth and safe production process, and its strong surface also ensures that the patterns printed on its outer surface or below remain intact during subsequent sterilization and transportation, avoiding wear and tear;

[0033] The inner side of the printed protective composite film 1 is the outer PE protective film 2, which mainly plays a supporting and preliminary protection role, and the EVOH high barrier layer 3 located in the middle of the structure acts as an efficient barrier, which can greatly block the penetration of external oxygen, thereby effectively preventing the deterioration of the juice and other easily oxidized liquid food in the bag, and significantly extending its shelf life.

[0034] In order to firmly combine different material layers into a whole, special adhesive layers 5 are provided between the EVOH high barrier layer 3 and the outer PE protective film 2, as well as between the inner layer 4, which ensure the structural integrity and reliability of the composite film during high-speed processing and use.

[0035] The inner layer 4 is directly in contact with the packaging content, and is sealed by heating and melting during the packaging and bag making process to form a sanitary and sealed packaging container, and its thickness and material properties also ensure the reliability of the heat sealing strength.

[0036] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

Claims

1. A high-barrier type liquid packaging film, characterized by, It comprises a printing protection composite film (1), an outer PE protection film (2), an EVOH high barrier layer (3) and an inner layer (4) arranged from outside to inside; An adhesive layer (5) is arranged between the EVOH high barrier layer (3) and the inner layer (4) and between the EVOH high barrier layer (3) and the outer PE protection film (2). The printing protection composite film (1) is made of polyethylene terephthalate film or nylon film.

2. The high-barrier liquid packaging film according to claim 1, characterized by An outer surface of the outer PE protection film (2) is provided with a printing pattern layer (6).

3. The high-barrier type liquid packaging film according to claim 1, characterized by, The thickness of the outer PE protection film (2) is 15-30 μm, and the outer PE protection film (2) is a polyethylene protection film.

4. The high-barrier liquid packaging film according to claim 1, characterized by The thickness of the EVOH high barrier layer (3) is 5-15 μm, and the EVOH high barrier layer (3) is an ethylene-vinyl alcohol copolymer layer.

5. The high-barrier liquid packaging film according to claim 1, characterized by The adhesive layer (5) is a polyurethane adhesive layer or a polyethylene modified adhesive resin layer.

6. The high-barrier liquid packaging film according to claim 1, characterized by The thickness of the inner layer (4) is 40-70 μm.

7. The high-barrier liquid packaging film according to claim 1, characterized by The inner layer (4) is a polyethylene heat sealing layer.

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