All-plastic composite packaging sheet and flexible packaging container

Abstract

The utility model belongs to the technical field of composite packaging sheets, and particularly relates to an all-plastic composite packaging sheet and a flexible packaging container, which comprise a first heat sealing layer, a supporting layer, a toughening layer, a second heat sealing layer, a first bonding layer, a second bonding layer and a third bonding layer, the first heat sealing layer is a high-density polyolefin film; the supporting layer is a polyester film; the toughening layer is a polyamide film; the second heat sealing layer is a high-density polyolefin film; and the first bonding layer, the second bonding layer and the third bonding layer are polyurethane bonding agents and are used for bonding and compounding all layers of films. The all-plastic composite packaging sheet and the flexible packaging container provided by the utility model can meet the condition of high-temperature sterilization within one hour at the temperature of 100-131 DEG C; good mechanical performance and toughness are achieved, and deformation or breakage is not prone to occurring under the high-temperature condition; and the packaging film has good rebound resilience and flexibility, and is suitable for packaging products with high appearance requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite packaging sheets, and in particular relates to a full-plastic composite packaging sheet and a flexible packaging container. Background Art

[0002] Composite packaging sheets are a type of sheet made of a combination of different types of materials, used to make packaging materials, such as hoses. Hoses made of composite packaging sheets are widely used in product packaging in industries such as food, medicine, and daily chemicals. With the continuous advancement of science and technology, the technology of composite packaging sheets and hoses is also constantly innovating and developing, providing more possibilities for the packaging industry.

[0003] When packaging food that requires high-temperature sterilization, such as vegetable juice, jam, condiments, etc., the packaging sheets and hoses need to withstand the high temperatures during sterilization, and the packaging sheets and hoses are required to have good high-temperature resistance. If the packaging sheets and hoses have poor high-temperature resistance, the packaging will shrink and deform under high-temperature conditions, or even crack, causing the contents to spill.

[0004] High-end cosmetics with high packaging requirements for appearance, such as essences, creams, sunscreens, etc., require packaging sheets and hoses to have good flexibility and resilience to ensure the aesthetics of their outer packaging. If the flexibility and resilience of packaging sheets and hoses are not good, such as using packaging sheets and hoses containing aluminum foil, it will make it difficult to recover the creases caused by the packaging being stacked, reducing the aesthetics of the product packaging and affecting consumers' purchasing desire.

[0005] Therefore, designing a composite sheet and hose that has both high temperature resistance and flexibility has considerable practical value and market prospects. Utility Model Content

[0006] In view of the shortcomings of the prior art, the utility model provides an all-plastic composite packaging sheet and a flexible packaging container, which are suitable for packaging viscous or fluid contents, can meet high-temperature sterilization conditions of 100°C~131°C within one hour, and have good resilience.

[0007] In order to achieve the above-mentioned purpose, the utility model is realized by the following technical scheme: an all-plastic composite packaging sheet and a flexible packaging container, comprising a first heat-sealing layer, a supporting layer, a toughening layer, a second heat-sealing layer, a first bonding layer, a second bonding layer and a third bonding layer. The first heat-sealing layer is a high-density polyolefin film, the supporting layer is a polyester film, the toughening layer is a polyamide film, and the second heat-sealing layer is a high-density polyolefin film. The first bonding layer is arranged between the first heat-sealing layer and the supporting layer to bond the first heat-sealing layer and the supporting layer together; the second bonding layer is arranged between the supporting layer and the toughening layer to bond the supporting layer and the toughening layer together; the third bonding layer is arranged between the toughening layer and the second heat-sealing layer to bond the toughening layer and the second heat-sealing layer together.

[0008] The all-plastic composite packaging sheet is mainly used for packaging of food, medicine, skin care products and other contents to prevent the contents from deteriorating or other effects caused by direct contact with the outside world. The first heat-sealing layer and the second heat-sealing layer are both made of high-density polyolefin film, which has heat-sealability. The first heat-sealing layer and the second heat-sealing layer can be heat-sealed and connected by the edge seam heat-sealing process to make the sheet into a tube. The polyester film is used as the supporting layer, which has high strength and medium stiffness, can increase the stiffness of the sheet, and at the same time provide good barrier properties, so that the sheet is not easy to deform under high temperature conditions. The polyamide film is used as the toughening layer, which has good mechanical properties and high thermal stability, can increase the toughness of the sheet and prevent the sheet from breaking. The first adhesive layer, the second adhesive layer and the third adhesive layer bond and composite the layers of film. In addition, the materials used in the all-plastic composite packaging sheet can withstand high temperature conditions above 100°C, so that the sheet can be used for product packaging with high-temperature sterilization requirements within 100°C.

[0009] Furthermore, in the above-mentioned all-plastic composite packaging sheet, the first heat-sealing layer is preferably a high-density polyethylene film with a thickness of 30-160 μm.

[0010] Furthermore, in the above-mentioned all-plastic composite packaging sheet, the second heat-sealing layer is preferably a high-density polyethylene film with a thickness of 30-160 μm.

[0011] High-density polyethylene has good flatness and smoothness, is suitable for the application of various printing technologies, and can play the role of printing substrate. High-density polyethylene film can also reduce the impact of external pollutants on the contents, thereby protecting the purity and quality of the contents.

[0012] Furthermore, in the above-mentioned all-plastic composite packaging sheet, the first heat-sealing layer is preferably a composite film formed by two layers of films, with a thickness of 30-160 μm. The composite film is selected from any one of the following composite films: a composite film of a high-density polyethylene film and a polyvinyl alcohol film, a composite film of a high-density polyethylene film and a polyvinyl chloride film, and a composite film of a high-density polyethylene film and a polyamide resin film.

[0013] Furthermore, in the above-mentioned all-plastic composite packaging sheet, the second heat-sealing layer is preferably a composite film formed by two layers of films, with a thickness of 30-160 μm. The composite film is selected from any one of the following composite films: a composite film of a high-density polyethylene film and a polyvinyl alcohol film, a composite film of a high-density polyethylene film and a polyvinyl chloride film, and a composite film of a high-density polyethylene film and a polyamide resin film.

[0014] The composite films of high-density polyethylene film and polyvinyl alcohol film, the composite films of high-density polyethylene film and polyvinyl chloride film, and the composite films of high-density polyethylene film and polyamide resin film have good heat sealing properties.

[0015] Furthermore, the supporting layer of the above-mentioned all-plastic composite packaging sheet is preferably a polyethylene terephthalate film with a thickness of 10-40 μm. The polyethylene terephthalate film itself has high strength and medium stiffness, and can be used as a supporting layer to increase the stiffness of the sheet and provide excellent barrier properties. In addition, the polyethylene terephthalate film has high heat resistance and can remain stable under high temperature conditions, so that the sheet is not easily deformed after high-temperature sterilization.

[0016] Furthermore, the toughening layer of the all-plastic composite packaging sheet is preferably a polycaprolactam film or a polyhexamethylene adipamide film with a thickness of 10-40 μm. The polycaprolactam film or the polyhexamethylene adipamide film has good mechanical properties and high thermal stability, and can increase the toughness of the sheet and prevent the sheet from breaking.

[0017] Furthermore, in the above-mentioned all-plastic composite packaging sheet, the first adhesive layer, the second adhesive layer and the third adhesive layer are preferably polyurethane adhesive. The thickness of the first adhesive layer, the second adhesive layer and the third adhesive layer is 2-6 μm. The polyurethane adhesive has good bonding performance and can be used to bond the composite layers of thin films.

[0018] Based on the above-mentioned all-plastic composite sheet, the utility model further provides a flexible packaging container, including a tube body for accommodating contents, the tube body is formed by rolling the above-mentioned all-plastic composite packaging sheet. In the tube body, the first heat-sealing layer is located on the inner side, contacts the contents, and limits the spatial range of the contents; the second heat-sealing layer is located on the outer side to block the external environment.

[0019] Based on the above-mentioned all-plastic composite sheet, the utility model further provides another flexible packaging container, including a tube body for accommodating contents, the tube body is formed by rolling the above-mentioned all-plastic composite packaging sheet. In the tube body, the second heat-sealing layer is located on the inner side, contacts the contents, and limits the spatial range of the contents; the first heat-sealing layer is located on the outer side, blocking the external environment.

[0020] The above two flexible packaging containers can be used to hold food or skin care products. The tube body is made of the above all-plastic composite packaging sheet by heat sealing, so it has excellent high temperature resistance and can withstand high temperature conditions above 100°C, so that the flexible packaging container is not easy to stretch and deform after high temperature sterilization. The all-plastic tube body has good resilience and can be used for product applications with high requirements for the resilience and appearance of the tube body. The high-density polyolefin film has relatively stable chemical properties, so it can be used in contact with the contents.

[0021] It can be seen from the above technical scheme that the utility model has the following beneficial effects: the all-plastic composite packaging sheet and flexible container disclosed in the utility model use materials that can withstand high temperature conditions above 100°C, ensuring that the sheet can meet high temperature sterilization conditions of 100°C~131°C within one hour; have good mechanical properties and toughness, and are not easy to deform or crack at high temperatures; have good resilience and flexibility, and are suitable for the packaging of products with high requirements on appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the all-plastic composite sheet of the utility model;

[0023] Figure 2 It is a schematic diagram of heat sealing of the flexible packaging container tube of the utility model;

[0024] In the figure: 1, first heat sealing layer; 2, support layer; 3, toughening layer; 4, second heat sealing layer; 5, first bonding layer; 6, second bonding layer; 7, third bonding layer. DETAILED DESCRIPTION

[0025] Example 1

[0026] like Figure 1 , a full plastic composite packaging sheet, comprising a first heat sealing layer 1, a support layer 2, a toughening layer 3, a second heat sealing layer 4, a first adhesive layer 5, a second adhesive layer 6 and a third adhesive layer 7. The first heat sealing layer 1 is a high-density polyolefin film, the support layer 2 is a polyester film, the toughening layer 3 is a polyamide film, the second heat sealing layer 4 is a high-density polyolefin film, the first adhesive layer 5 is arranged between the first heat sealing layer 1 and the support layer 2, and the first heat sealing layer 1 and the support layer 2 are bonded together; the second adhesive layer 6 is arranged between the support layer 2 and the toughening layer 3, and the support layer 2 and the toughening layer 3 are bonded together; the third adhesive layer 7 is arranged between the toughening layer 3 and the second heat sealing layer 4, and the toughening layer 3 and the second heat sealing layer 4 are bonded together.

[0027] In this embodiment, the first heat-sealing layer 1 is a high-density polyethylene film with a thickness of 160 μm.

[0028] In this embodiment, the second heat-sealing layer 4 is a high-density polyethylene film with a thickness of 30 μm.

[0029] In this embodiment, the support layer 2 is a polyethylene terephthalate film with a thickness of 10 μm.

[0030] In this embodiment, the toughening layer 3 is a polycaprolactam film with a thickness of 40 μm.

[0031] In this embodiment, the first adhesive layer 5 , the second adhesive layer 6 and the third adhesive layer 7 are all two-component polyurethane adhesives, and the thickness is 2 μm.

[0032] The main agent of the two-component polyurethane adhesive is polyether or polyester polyol, and the curing agent is an adduct of aromatic isocyanate and trimethylolpropane. When in use, the two groups of reagents are mixed, diluted with ethyl acetate, and then coated and compounded, and then the compounded film is aged. Through the ripening, the residual solvent is removed, and a polyurethane adhesive layer with a network cross-linked structure is generated. The curing agent also forms a chemical bond with the surface of the substrate film material to form a strong bond, thereby improving the peel strength between the films.

[0033] The all-plastic composite packaging sheet is mainly used for packaging of food, medicine, skin care products and other contents to prevent the contents from deteriorating or other effects caused by direct contact with the outside world. The first heat-sealing layer 1 and the second heat-sealing layer 4 are both made of high-density polyethylene film, which can be printed and printed, and also have good heat-sealing performance. The first heat-sealing layer 1 and the second heat-sealing layer 4 can be heat-sealed and connected by the edge seam heat-sealing process to make the sheet into a tube. The polyethylene terephthalate film is used as the supporting layer 2, which has high strength and medium stiffness, can increase the stiffness of the sheet, and make the sheet not easy to deform under high temperature conditions. The polycaprolactam film is used as the toughening layer 3, which has good mechanical properties and high thermal stability, can increase the toughness of the sheet, and prevent the sheet from breaking. The first adhesive layer 5, the second adhesive layer 6 and the third adhesive layer 7 are bonded and composited with each layer of film. In addition, the materials used in the all-plastic composite packaging sheet can withstand high temperature conditions above 100°C, so that the sheet can be used for product packaging with high-temperature sterilization requirements within 100°C.

[0034] like Figure 2 As shown, the first heat sealing layer 1 and the second heat sealing layer 4 are heat-sealed and connected by the edge seam heat sealing process, and the sheet is made into a tube body. In the tube body, the first heat sealing layer 1 is located on the inside, contacts the contents, and limits the spatial range of the contents; the second heat sealing layer 4 is located on the outside, blocking the external environment.

[0035] The flexible packaging container in this embodiment can be used to hold food, medicine, skin care products and other contents. The tube body of the flexible packaging container is made of the above-mentioned all-plastic composite packaging sheet by heat sealing, so it has excellent high temperature resistance and can withstand high temperature conditions above 100°C, so that the flexible packaging container is not easy to expand and deform after high temperature sterilization. The all-plastic tube body has good resilience and can be used for product applications with high requirements for the resilience and appearance of the tube body. The high-density polyolefin film has relatively stable chemical properties and can be used in contact with the contents.

[0036] Example 2

[0037] like Figure 1, a full plastic composite packaging sheet, comprising a first heat sealing layer 1, a support layer 2, a toughening layer 3, a second heat sealing layer 4, a first adhesive layer 5, a second adhesive layer 6 and a third adhesive layer 7. The first heat sealing layer 1 is a high-density polyolefin film, the support layer 2 is a polyester film, the toughening layer 3 is a polyamide film, the second heat sealing layer 4 is a high-density polyolefin film, the first adhesive layer 5 is arranged between the first heat sealing layer 1 and the support layer 2, and the first heat sealing layer 1 and the support layer 2 are bonded together; the second adhesive layer 6 is arranged between the support layer 2 and the toughening layer 3, and the support layer 2 and the toughening layer 3 are bonded together; the third adhesive layer 7 is arranged between the toughening layer 3 and the second heat sealing layer 4, and the toughening layer 3 and the second heat sealing layer 4 are bonded together.

[0038] In this embodiment, the first heat-sealing layer 1 is a composite film of a high-density polyethylene film and a polyvinyl chloride film, and has a thickness of 30 μm.

[0039] In this embodiment, the second heat-sealing layer 4 is a composite film of a high-density polyethylene film and a polyamide resin film, and has a thickness of 160 μm.

[0040] In this embodiment, the support layer 2 is a polyethylene terephthalate film with a thickness of 40 μm.

[0041] In this embodiment, the toughening layer 3 is a polyhexamethylene adipamide film with a thickness of 10 μm.

[0042] In this embodiment, the first adhesive layer 5 , the second adhesive layer 6 and the third adhesive layer 7 are all two-component polyurethane adhesives, and the thickness is 6 μm.

[0043] The main agent of the two-component polyurethane adhesive is polyether or polyester polyol, and the curing agent is an adduct of aromatic isocyanate and trimethylolpropane. When in use, the two groups of reagents are mixed, diluted with ethyl acetate, and then coated and compounded, and then the compounded film is aged. Through the ripening, the residual solvent is removed, and a polyurethane adhesive layer with a network cross-linked structure is generated. The curing agent also forms a chemical bond with the surface of the substrate film material to form a strong bond, thereby improving the peel strength between the films.

[0044] The all-plastic composite packaging sheet is mainly used for packaging of food, medicine, skin care products and other contents to prevent the contents from deteriorating or other effects caused by direct contact with the outside world. The first heat-sealing layer 1 adopts a composite film of high-density polyethylene film and polyvinyl chloride film, and the second heat-sealing layer 4 adopts a composite film of high-density polyethylene film and polyamide resin film. The first heat-sealing layer 1 and the second heat-sealing layer 4 can be printed and printed, and also have good heat-sealing performance. The first heat-sealing layer 1 and the second heat-sealing layer 4 can be heat-sealed and connected by the side seam heat-sealing process to make the sheet into a tube body. Polyethylene terephthalate film is used as the supporting layer 2, which has high strength and medium stiffness, can increase the stiffness of the sheet, and make the sheet not easy to deform under high temperature conditions. Polyhexamethylene adipamide film is used as the toughening layer 3, which has good mechanical properties and high thermal stability, can increase the toughness of the sheet and prevent the sheet from breaking. The first bonding layer 5, the second bonding layer 6 and the third bonding layer 7 bond the composite layers of the film. In addition, the materials used in the all-plastic composite packaging sheet can withstand high temperature conditions above 100°C, so that the sheet can be used for packaging products whose contents require high-temperature sterilization within 100°C.

[0045] like Figure 2 As shown, the first heat-sealing layer 1 and the second heat-sealing layer 4 are heat-sealed and connected by the edge seam heat-sealing process, and the sheet is made into a tube body. In the tube body, the second heat-sealing layer 4 is located on the inside, contacts the contents, and limits the spatial range of the contents; the first heat-sealing layer 1 is located on the outside, blocking the external environment.

[0046] The flexible packaging container in this embodiment can be used to hold food, medicine, skin care products and other contents. The tube body of the flexible packaging container is made of the above-mentioned all-plastic composite packaging sheet by heat sealing, so it has excellent high temperature resistance and can withstand high temperature conditions above 100°C, so that the flexible packaging container is not easy to expand and contract after high temperature sterilization. The all-plastic tube body has good resilience and can be used for product applications that require high resilience and appearance of the tube body. The composite film of high-density polyethylene film and polyamide resin film has relatively stable chemical properties, so it can be used to contact with the contents.

[0047] Example 3

[0048] like Figure 1, a full plastic composite packaging sheet, comprising a first heat sealing layer 1, a support layer 2, a toughening layer 3, a second heat sealing layer 4, a first adhesive layer 5, a second adhesive layer 6 and a third adhesive layer 7. The first heat sealing layer 1 is a high-density polyolefin film, the support layer 2 is a polyester film, the toughening layer 3 is a polyamide film, the second heat sealing layer 4 is a high-density polyolefin film, the first adhesive layer 5 is arranged between the first heat sealing layer 1 and the support layer 2, and the first heat sealing layer 1 and the support layer 2 are bonded together; the second adhesive layer 6 is arranged between the support layer 2 and the toughening layer 3, and the support layer 2 and the toughening layer 3 are bonded together; the third adhesive layer 7 is arranged between the toughening layer 3 and the second heat sealing layer 4, and the toughening layer 3 and the second heat sealing layer 4 are bonded together.

[0049] In this embodiment, the first heat-sealing layer 1 is a high-density polyethylene film with a thickness of 100 μm.

[0050] In this embodiment, the second heat-sealing layer 4 is a composite film of a high-density polyethylene film and a polyvinyl alcohol film, and has a thickness of 125 μm.

[0051] In this embodiment, the support layer 2 is a polyethylene terephthalate film with a thickness of 25 μm.

[0052] In this embodiment, the toughening layer 3 is a polycaprolactam film with a thickness of 25 μm.

[0053] In this embodiment, the first adhesive layer 5 , the second adhesive layer 6 and the third adhesive layer 7 are all two-component polyurethane adhesives, and the thickness is 4 μm.

[0054] The main agent of the two-component polyurethane adhesive is polyether or polyester polyol, and the curing agent is an adduct of aromatic isocyanate and trimethylolpropane. When in use, the two groups of reagents are mixed, diluted with ethyl acetate, and then coated and compounded, and then the compounded film is aged. Through the ripening, the residual solvent is removed, and a polyurethane adhesive layer with a network cross-linked structure is generated. The curing agent also forms a chemical bond with the surface of the substrate film material to form a strong bond, thereby improving the peel strength between the films.

[0055] The all-plastic composite packaging sheet is mainly used for packaging of food, skin care products and other contents to prevent the contents from deteriorating or other effects caused by direct contact with the outside world. The first heat-sealing layer 1 and high-density polyethylene film are used, which can be printed. The second heat-sealing layer 4 uses a composite film of high-density polyethylene film and polyvinyl alcohol film, which has good heat-sealability with the first heat-sealing layer 1. The first heat-sealing layer 1 and the second heat-sealing layer 4 can be heat-sealed and connected by a side seam heat-sealing process to make the sheet into a tube body. Polyethylene terephthalate film is used as the supporting layer 2, which has high strength and medium stiffness, can increase the stiffness of the sheet, and make the sheet not easy to deform under high temperature conditions. Polycaprolactam film is used as the toughening layer 3, which has good mechanical properties and high thermal stability, can increase the toughness of the sheet and prevent the sheet from breaking. The first bonding layer 5, the second bonding layer 6 and the third bonding layer 7 bond the composite layers of film. In addition, the materials used in the all-plastic composite packaging sheet can withstand high temperature conditions above 100°C, so that the sheet can be used for packaging products whose contents require high-temperature sterilization within 100°C.

[0056] like Figure 2 As shown, the first heat sealing layer 1 and the second heat sealing layer 4 are heat-sealed and connected by the edge seam heat sealing process, and the sheet is made into a tube body. In the tube body, the first heat sealing layer 1 is located on the outside, contacts the contents, and limits the spatial range of the contents; the second heat sealing layer 4 is located on the inside, blocking the external environment.

[0057] The flexible packaging container in this embodiment can be used to hold food, medicine, skin care products and other contents. The tube body of the flexible packaging container is made of the above-mentioned all-plastic composite packaging sheet by heat sealing, so it has excellent high temperature resistance and can withstand high temperature conditions above 100°C, so that the flexible packaging container is not easy to stretch and deform after high temperature sterilization. The all-plastic tube body has good resilience and can be used for product applications that require high resilience and appearance of the tube body. The composite film of high-density polyethylene film and polyvinyl alcohol film has relatively stable chemical properties, so it can be used to contact with the contents.

Claims

1. A fully plastic composite packaging sheet, characterized in that: The invention comprises at least a first heat-sealing layer (1), a supporting layer (2), a toughening layer (3), a second heat-sealing layer (4), a first adhesive layer (5), a second adhesive layer (6) and a third adhesive layer (7); the first heat-sealing layer (1) is a high-density polyolefin film; the supporting layer (2) is a polyester film; the toughening layer (3) is a polyamide film; the second heat-sealing layer (4) is a high-density polyolefin film; the first adhesive layer (5) is arranged between the first heat-sealing layer (1) and the supporting layer (2) to bond the first heat-sealing layer (1) and the supporting layer (2) together; the second adhesive layer (6) is arranged between the supporting layer (2) and the toughening layer (3) to bond the supporting layer (2) and the toughening layer (3) together; the third adhesive layer (7) is arranged between the toughening layer (3) and the second heat-sealing layer (4) to bond the toughening layer (3) and the second heat-sealing layer (4) together.

2. The all-plastic composite packaging sheet according to claim 1, characterized in that: The first heat-sealing layer (1) is a high-density polyethylene film with a thickness of 30-160 μm.

3. The all-plastic composite packaging sheet according to claim 1, characterized in that: The second heat-sealing layer (4) is a high-density polyethylene film with a thickness of 30-160 μm.

4. The all-plastic composite packaging sheet according to claim 1, characterized in that: The first heat-sealing layer (1) is a composite film formed by laminating two layers of thin films, and has a thickness of 30-160 μm; the composite film is selected from any one of the following composite films: a composite film of a high-density polyethylene film and a polyvinyl alcohol film, a composite film of a high-density polyethylene film and a polyvinyl chloride film, and a composite film of a high-density polyethylene film and a polyamide resin film.

5. The all-plastic composite packaging sheet according to claim 1, characterized in that: The second heat-sealing layer (4) is a composite film formed by two layers of thin films, and has a thickness of 30-160 μm; the composite film is selected from any one of the following composite films: a composite film of a high-density polyethylene film and a polyvinyl alcohol film, a composite film of a high-density polyethylene film and a polyvinyl chloride film, and a composite film of a high-density polyethylene film and a polyamide resin film.

6. The all-plastic composite packaging sheet according to claim 1, characterized in that: The support layer (2) is a polyethylene terephthalate film with a thickness of 10-40 μm.

7. The all-plastic composite packaging sheet according to claim 1, characterized in that: The toughening layer (3) is a polycaprolactam film or a polyhexamethylene adipamide film, and has a thickness of 10-40 μm.

8. The all-plastic composite packaging sheet according to claim 1, characterized in that: The first adhesive layer (5), the second adhesive layer (6) and the third adhesive layer (7) are all polyurethane adhesives; the thickness of the first adhesive layer (5), the second adhesive layer (6) and the third adhesive layer (7) is 2-6 μm.

9. A flexible packaging container, comprising a tube body for accommodating contents, characterized in that: The tube body is formed by rolling the all-plastic composite packaging sheet according to any one of claims 1 to 8; in the tube body, the first heat-sealing layer (1) is located on the inner side, contacts the contents and limits the spatial range of the contents; the second heat-sealing layer (4) is located on the outer side to block the external environment.

10. A flexible packaging container, comprising a tube body for accommodating contents, characterized in that: The tube body is formed by rolling the all-plastic composite packaging sheet according to any one of claims 1 to 8; in the tube body, the second heat-sealing layer (4) is located on the inner side, contacts the contents and limits the spatial range of the contents; the first heat-sealing layer (1) is located on the outer side, blocking the external environment.

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