Aluminum-coated film high-barrier type packaging bag

Abstract

The utility model belongs to the packaging bag technical field, concretely is a kind of aluminized film high-barrier type packaging bag, including packaging bag body, the packaging bag body includes by the outer layer substrate layer, first adhesive layer, aluminized barrier layer, reinforcing layer, second adhesive layer, inner layer heat seal layer that sequentially compound from outside to inside;The reinforcing layer is the nanometer silicon dioxide modified polyurethane coating that is coated in the inner side of aluminized barrier layer;The inner layer heat seal layer is equipped with heat seal reinforcing layer in packaging bag body bag mouth area, and this heat seal reinforcing layer is the ethylene-acrylic acid copolymer layer that is co-extruded.The utility model can use nanometer silicon dioxide modified coating to fill up the microcrack of aluminized barrier layer by reinforcing layer, form dense barrier, simultaneously cooperate mica powder to extend gas permeation path, make oxygen transmission rate reduce 89%, solve the problem that aluminized layer is easily cracked and lead to barrier property drop.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag technology, specifically to an aluminum-coated high-barrier packaging bag. Background Technology

[0002] Packaging bags are bags used to package various products, making it convenient to transport and store goods during the production and distribution process. They are widely used in daily life and industrial production.

[0003] In actual use, existing aluminized film packaging bags are prone to micro-cracks when the aluminized layer is bent or impacted, which leads to a decrease in oxygen / water vapor barrier performance. Furthermore, the heat-sealed area at the bag opening is prone to delamination and leakage due to the weak interface between the aluminized layer and the heat-sealed layer. Therefore, we propose an aluminized film high-barrier packaging bag. Utility Model Content

[0004] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, the technical solution adopted by this utility model is as follows:

[0006] A high-barrier packaging bag with aluminized film includes a packaging bag body, wherein the packaging bag body comprises, from the outside to the inside, an outer substrate layer, a first adhesive layer, an aluminized barrier layer, a reinforcing layer, a second adhesive layer, and an inner heat-sealing layer, which are sequentially laminated from the outside to the inside.

[0007] The reinforcing layer is a nano-silica modified polyurethane coating applied to the inner side of the aluminum-plated barrier layer.

[0008] The inner heat-sealing layer has a heat-sealing reinforcement layer in the bag opening area of ​​the packaging bag. This heat-sealing reinforcement layer is a co-extruded ethylene-acrylic acid copolymer layer.

[0009] In a preferred embodiment, the present invention can be further configured such that the aluminum layer of the aluminum-plated barrier layer has a thickness of 30-50 nm and the surface is treated with corona discharge.

[0010] In a preferred embodiment, the present invention can be further configured such that: the reinforcing layer also contains flaky mica powder with a particle size of 1-5 μm, and the amount added is 3-8% of the total weight of the coating.

[0011] In a preferred embodiment, the present invention can be further configured such that the thickness of the heat-sealing reinforcement layer is 20%-30% of the total thickness of the inner heat-sealing layer, and extends 1-2 mm beyond the outer side of the sealing line of the packaging bag opening.

[0012] In a preferred embodiment, the present invention can be further configured such that: the outer substrate layer is a biaxially oriented polyester film, and the inner heat-sealing layer is linear low-density polyethylene.

[0013] In a preferred embodiment, the present invention can be further configured such that: the corner of the bag body is provided with an arc-shaped reinforcing rib, which is formed by pressing the outer substrate layer inward, and the pressing depth is 50%-70% of the total thickness of the bag body.

[0014] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0015] 1. This utility model uses a reinforcing layer to fill the micro-cracks in the aluminum-plated barrier layer with a nano-silica modified coating, forming a dense barrier. At the same time, it uses mica powder to extend the gas permeation path, reducing the oxygen permeability by 89%, thus solving the problem of the aluminum-plated layer being prone to cracking and causing a decrease in barrier performance.

[0016] 2. This utility model utilizes a heat-sealing reinforcement layer, which combines the polarity matching of the ethylene-acrylic acid copolymer layer and the aluminum plating layer, and forms a chemical bond structure through a second adhesive layer, extending to the outside of the sealing line and covering the area of ​​concentrated heat stress, thereby increasing the heat-sealing strength by 65% ​​and solving the problem of easy delamination and leakage. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the high-barrier aluminum-coated film packaging bag of this utility model;

[0018] Figure 2 This is a front view of the high-barrier aluminum-coated film packaging bag of this utility model.

[0019] Figure label:

[0020] 1. Outer substrate layer; 2. First adhesive layer; 3. Aluminum-plated barrier layer; 4. Reinforcing layer; 5. Second adhesive layer; 6. Inner heat-sealing layer; 7. Heat-sealing reinforcement layer; 8. Arc-shaped reinforcing rib; 9. Packaging bag body. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0022] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0023] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a high-barrier aluminum-coated film packaging bag.

[0024] Combination Figure 1-2As shown, the present invention provides an aluminized film high-barrier packaging bag, including a packaging bag body 9, wherein the packaging bag body 9 includes an outer substrate layer 1, a first adhesive layer 2, an aluminized barrier layer 3, a reinforcing layer 4, a second adhesive layer 5, and an inner heat-sealing layer 6, which are sequentially laminated from the outside to the inside.

[0025] Furthermore, the reinforcing layer 4 is a nano-silica modified polyurethane coating applied to the inner side of the aluminum-plated barrier layer 3. The nano-silica modified coating can fill the micro-cracks in the aluminum-plated barrier layer 3 to form a dense barrier. At the same time, it is combined with mica powder to extend the gas permeation path, thereby reducing the oxygen permeability by 89%, which solves the problem of the aluminum-plated layer being prone to cracking and thus reducing the barrier performance.

[0026] Furthermore, the inner heat-sealing layer 6 has a heat-sealing reinforcement layer 7 in the bag opening area of ​​the packaging bag body 9. The heat-sealing reinforcement layer 7 is a co-extruded ethylene-acrylic acid copolymer layer. The thickness of the heat-sealing reinforcement layer 7 is 20%-30% of the total thickness of the inner heat-sealing layer 6. If it is too thin, it cannot cover interface defects; if it is too thick, it will affect the heat-sealing efficiency. It extends 1-2 mm outside the sealing line of the bag opening of the packaging bag body 9. Through the heat-sealing reinforcement layer 7, the polarity of the ethylene-acrylic acid copolymer layer and the aluminized layer are matched, and a chemical bond structure is formed through the second adhesive layer 5. It extends to the outside of the sealing line and covers the area of ​​heat stress concentration, thereby increasing the heat-sealing strength by 65% ​​and solving the problem of easy delamination and leakage. The heat-sealing reinforcement layer 7 is dedicated to the bag opening and eliminates the interface failure problem between the aluminized layer and the heat-sealing layer.

[0027] Specifically, the aluminum layer of the aluminum-plated barrier layer 3 has a thickness of 30-50nm, and its surface is treated with corona discharge. The corona discharge treatment improves the adhesion of the coating 4 and prevents the coating from peeling off.

[0028] Furthermore, the reinforcing layer 4 also contains flaky mica powder with a particle size of 1-5 μm, and the amount added is 3-8% of the total weight of the coating. The addition of flaky mica powder creates a maze effect, blocking the path of water vapor.

[0029] Furthermore, the outer substrate layer 1 is a biaxially oriented polyester film, and the inner heat-sealing layer 6 is linear low-density polyethylene.

[0030] Furthermore, the corner of the bag is provided with an arc-shaped reinforcing rib 8, which is formed by pressing the outer substrate layer 1 inward. The pressing depth is 50%-70% of the total thickness of the bag. The arc-shaped reinforcing rib 8 can convert the corner impact force into circumferential stress, avoiding stress concentration and cracking of the aluminum plating layer. At the same time, the thickness is controlled. If it is too shallow, it will be ineffective, and if it is too deep, it will damage the barrier layer. The design is more reasonable.

[0031] In this application, the terms "featured", "set up", "composite", and "coated" in the functional thin film laminate system specifically refer to molecular / interface level bonding. The specific implementation methods include vapor deposition bonding, hot pressing bonding, solution coating-drying, plasma treatment coupling, co-extrusion casting, dip coating, and adhesive bonding. Such descriptions explicitly exclude mechanical connection forms such as welding, riveting, or screw fixing.

[0032] The above explanation of layered structures refers to the configuration relationship that can be understood and implemented by those skilled in the art based on the function of the relevant components, the context, and common knowledge. Its purpose is to clearly describe the relative positions, cooperation methods, and functional implementation paths between structures. To ensure smooth and concise reading of the manual and to facilitate understanding, no separate explanation is provided after the corresponding terms.

[0033] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-barrier packaging bag with an aluminized film, comprising a packaging bag body (9), characterized in that, The packaging bag (9) comprises, from the outside to the inside, an outer substrate layer (1), a first adhesive layer (2), an aluminum-plated barrier layer (3), a reinforcing layer (4), a second adhesive layer (5), and an inner heat-sealing layer (6). The reinforcing layer (4) is a nano-silica modified polyurethane coating coated on the inner side of the aluminum-plated barrier layer (3); The inner heat-sealing layer (6) has a heat-sealing reinforcement layer (7) in the bag opening area of ​​the packaging bag body (9), and the heat-sealing reinforcement layer (7) is a co-extruded ethylene-acrylic acid copolymer layer.

2. The high-barrier aluminum-coated film packaging bag according to claim 1, characterized in that, The aluminum layer of the aluminum-plated barrier layer (3) has a thickness of 30-50 nm and its surface is treated with corona discharge.

3. The high-barrier aluminum-coated film packaging bag according to claim 1, characterized in that, The reinforcing layer (4) also contains flake mica powder with a particle size of 1-5 μm, and the amount added is 3-8% of the total weight of the coating.

4. The high-barrier aluminum-coated film packaging bag according to claim 1, characterized in that, The thickness of the heat-sealing reinforcement layer (7) is 20%-30% of the total thickness of the inner heat-sealing layer (6), and extends 1-2 mm to the outside of the sealing line of the bag opening of the packaging bag (9).

5. The high-barrier aluminum-coated film packaging bag according to claim 1, characterized in that, The outer substrate layer (1) is a biaxially oriented polyester film, and the inner heat-sealing layer (6) is linear low-density polyethylene.

6. The high-barrier aluminum-coated film packaging bag according to claim 1, characterized in that, The corner of the bag is provided with an arc-shaped reinforcing rib (8), which is formed by pressing the outer substrate layer (1) inward, with a pressing depth of 50%-70% of the total thickness of the bag.

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