High-temperature-resistant composite soft can packaging bag

Abstract

The utility model discloses a high-temperature-resistant composite soft can packaging bag, which relates to the technical field of packaging bags and comprises a bag body, the bag body is sealed by a heat sealing edge and is made of a composite film, and the composite film sequentially comprises a polyester film layer, an aluminum foil layer, a nylon film layer and a polypropylene composite film layer from outside to inside. The polyester film layer, the aluminum foil layer, the nylon film layer and the polypropylene composite film layer are arranged, the aluminum foil layer forms a barrier foundation, oxygen, water vapor, light and peculiar smell can be absolutely isolated, and the nylon film layer and the polypropylene composite film layer are connected through the modified polypropylene adhesive. Therefore, the defect that a traditional polyurethane adhesive is easy to hydrolyze and degrade is overcome, layering and air leakage risks are completely eradicated, the nylon film layer has excellent toughness and impact resistance, the firm interface, the strength of the polyester film layer, the rigidity of the aluminum foil layer and the flexibility of the polypropylene composite film layer are combined into a firm whole, and the puncture resistance of the packaging bag is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag technology, and in particular to a high-temperature resistant composite soft can packaging bag. Background Technology

[0002] Retort pouches, also known as heat-resistant composite retort pouches, are a crucial material in the packaging of food, pharmaceuticals, and certain specialty industrial products. For goods requiring high-temperature sterilization, these pouches are essential. They are typically made by laminating multiple layers of film materials with different functions using dry or solvent-free lamination processes. The structural design aims to synergistically leverage the advantages of each layer to achieve overall performance requirements. A common structure includes an outer layer, a middle barrier layer, and an inner heat-sealing layer. The overall composite structure allows it to withstand steam or boiling sterilization processes at 121°C or even higher, while maintaining the integrity, barrier properties, and physical strength of the packaging, thus providing reliable protection for the contents.

[0003] Because the types of items contained in the packaging bags are diverse, such as various ready-to-eat foods, seasonings, sauces, and pharmaceutical products that require high-temperature sterilization, the performance requirements of the packaging bags vary depending on the items.

[0004] For example, some foods with high oil content require packaging bags with good oil-blocking properties to prevent oil leakage from affecting the packaging appearance and food quality; while some pharmaceutical products require packaging bags with high barrier properties to prevent external moisture and oxygen from entering and affecting the stability and efficacy of the medicine; in addition, some bone and meat products have extremely high requirements for the puncture resistance of the packaging bags; therefore, it is difficult for high-temperature resistant composite flexible can packaging bags to simultaneously meet the problems of high barrier properties, puncture resistance, high-temperature hydrolysis resistance, and long-term storage reliability. In view of this, this application proposes a high-temperature resistant composite flexible can packaging bag based on the above technical problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-temperature resistant composite soft can packaging bag.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-temperature resistant composite flexible can packaging bag includes a bag body, which is formed by heat sealing the edges. The bag body is made of a composite film, which comprises, from the outside to the inside:

[0008] Polyester film layer;

[0009] Aluminum foil layer;

[0010] Nylon film layer;

[0011] Polypropylene composite film layer;

[0012] The aluminum foil layer is fixedly connected to the polyester film layer and the nylon film layer on both sides by polyurethane adhesive, and the nylon film layer is fixedly connected to the polypropylene composite film layer by modified polypropylene adhesive.

[0013] Furthermore, the bag body is provided with an exhaust port near the top, and the exhaust port is covered with a heat-sealable shrinkable film strip, which has micro-perforations.

[0014] Furthermore, a protective film is provided on the outside of the exhaust port, and a layer of adhesive is provided around the lower surface of the protective film.

[0015] Furthermore, the outer surface of the bag is provided with concave and convex reinforcing ribs, which are distributed in a grid pattern.

[0016] Furthermore, the polypropylene composite film layer is a co-extruded cast polypropylene film, the inner surface of which is corona-treated.

[0017] Furthermore, the modified polypropylene adhesive is a maleic anhydride-grafted modified polypropylene adhesive.

[0018] Furthermore, the thickness of the aluminum foil layer is 7-9 μm.

[0019] Furthermore, an arc-shaped thickened area is provided at the corner of the inside of the bag, and a high-temperature resistant fiber mesh is embedded inside the arc-shaped thickened area.

[0020] Furthermore, the outer surface of the polyester film layer is coated with a high-temperature resistant matte coating.

[0021] The beneficial effects of this utility model are as follows:

[0022] 1. This utility model incorporates a polyester film layer, an aluminum foil layer, a nylon film layer, and a polypropylene composite film layer. The aluminum foil layer forms the basis of the barrier function, absolutely blocking oxygen, water vapor, light, and odors, ensuring the stability and safety of the contents during long-term storage. A modified polypropylene adhesive is used to connect the nylon film layer and the polypropylene composite film layer. The active groups in the modified polypropylene adhesive form strong chemical bonds with the nylon molecules, while its polypropylene backbone diffuses and intertwines with the inner polypropylene molecular chains. This overcomes the defect of traditional polyurethane adhesives being easily hydrolyzed and degraded at this interface, thus eliminating the risk of barrier failure and leakage due to delamination, achieving long-term storage reliability. The nylon film layer, with its extremely high toughness, impact resistance, and bending resistance, effectively resists punctures. Through the aforementioned strong bonding interface, the toughness of the nylon film layer is completely combined with the external strength of the polyester film layer, the rigid support of the aluminum foil layer, and the flexible buffering of the polypropylene composite film layer into a robust whole, making the puncture resistance of the packaging bag far exceed that of ordinary structures.

[0023] 2. This utility model further enhances the overall rigidity and compressive strength of the bag by setting concave and convex reinforcing ribs and arc-shaped thickened areas. The concave and convex reinforcing ribs effectively prevent deformation or damage caused by external pressure during stacking and transportation. At the same time, the arc-shaped thickened areas set at the corners of the bag and the high-temperature resistant fiber mesh embedded inside them are reinforcement designs for the most vulnerable corners of the packaging, which significantly improves the packaging bag's resistance to deformation when heated.

[0024] 3. This utility model, by setting a film strip, micro-perforations, and a protective film, allows the air and water vapor generated inside the bag to expand due to heat during the high-temperature cooking sterilization process to be discharged through the micro-perforations on the heat-fusible shrinkable film strip covering the exhaust port, thus preventing the bag from continuously expanding. The protective film set on the outside of the exhaust port is glued to the outside of the exhaust port with an adhesive layer, providing physical protection for the exhaust port. The protective film can be torn off before heating the bag. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the composite film structure of a high-temperature resistant composite soft can packaging bag proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of a high-temperature resistant composite soft can packaging bag proposed in this utility model;

[0027] Figure 3 This is a schematic diagram of the interior of a high-temperature resistant composite soft can packaging bag proposed in this utility model;

[0028] Figure 4 This is a schematic diagram of the film strip of a high-temperature resistant composite soft can packaging bag proposed in this utility model;

[0029] Figure 5 This is a schematic diagram of the protective film for a high-temperature resistant composite soft can packaging bag proposed in this utility model.

[0030] In the diagram: 1. Bag body; 2. Composite film; 3. Polyester film layer; 4. Aluminum foil layer; 5. Nylon film layer; 6. Polypropylene composite film layer; 7. Polyurethane adhesive; 8. Modified polypropylene adhesive; 9. Film strip; 10. Micro-perforation; 11. Protective film; 12. Adhesive layer; 13. Reinforcing ribs; 14. Arc-shaped thickened area. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0032] Reference Figure 1-2 A high-temperature resistant composite flexible can packaging bag includes a bag body 1, which is formed by heat sealing the edges. The bag body 1 is made of a composite film 2, which comprises, from the outside to the inside:

[0033] Polyester film layer 3;

[0034] Aluminum foil layer 4;

[0035] 5. Nylon film layer;

[0036] Polypropylene composite film layer 6;

[0037] The aluminum foil layer 4 is fixedly connected to the polyester film layer 3 and the nylon film layer 5 on both sides by polyurethane adhesive 7, and the nylon film layer 5 is fixedly connected to the polypropylene composite film layer 6 by modified polypropylene adhesive 8.

[0038] The aluminum foil layer 4 forms the basis of the barrier function, absolutely blocking oxygen, water vapor, light, and odors, ensuring the stability and safety of the contents during long-term storage. A modified polypropylene adhesive 8 is used to connect the nylon film layer 5 and the polypropylene composite film layer 6. The active groups in the modified polypropylene adhesive 8 form strong chemical bonds with nylon molecules, while its polypropylene backbone diffuses and intertwines with the inner polypropylene molecular chains. This overcomes the defect of traditional polyurethane adhesive 7 being easily hydrolyzed and degraded at this interface, thus eliminating the risk of barrier failure and leakage due to delamination, achieving long-term storage reliability. The nylon film layer 5, with its extremely high toughness, impact resistance, and bending resistance, effectively resists punctures. Through the aforementioned strong bonding interface, the toughness of the nylon film layer 5 is completely combined with the external strength of the polyester film layer 3, the rigid support of the aluminum foil layer 4, and the flexible cushioning of the polypropylene composite film layer 6 into a robust whole, making the puncture resistance of the packaging bag far exceed that of ordinary structures.

[0039] Reference Figure 2 , Figure 4 Specifically: an exhaust port is provided near the top of the bag body 1, and the exhaust port is covered with a heat-sealable shrinkable film strip 9. The film strip 9 is provided with micro-perforations 10. During the high-temperature cooking sterilization process, the air and water vapor generated inside the bag due to heat expansion are discharged through the micro-perforations 10 on the heat-sealable shrinkable film strip 9 covering the exhaust port, thus preventing the bag body 1 from continuously expanding.

[0040] Reference Figure 2 , Figure 5 Specifically: a protective film 11 is provided on the outside of the exhaust port, and a layer of adhesive 12 is provided around the lower surface of the protective film 11. The protective film 11 is attached to the outside of the exhaust port by the adhesive layer 12, providing physical protection for the exhaust port. The protective film 11 can be torn off in front of the heating bag body 1.

[0041] Reference Figure 3 Specifically: the outer surface of the bag body 1 is provided with concave and convex reinforcing ribs 13, which are distributed in a grid pattern, further improving the overall rigidity and compressive strength of the bag body 1, and effectively preventing deformation or damage caused by external pressure during stacking and transportation.

[0042] Reference Figure 1 Specifically: the polypropylene composite film layer 6 is a co-extruded cast polypropylene film, the inner surface of which is corona treated.

[0043] Reference Figure 1 Specifically, the modified polypropylene adhesive 8 is a maleic anhydride grafted modified polypropylene adhesive.

[0044] Reference Figure 1Specifically, the thickness of the aluminum foil layer 4 is 7-9 μm.

[0045] Reference Figure 3 Specifically: an arc-shaped thickened area 14 is provided at the inner corner of the bag body 1. The arc-shaped thickened area 14 is embedded with a high-temperature resistant fiber mesh, which strengthens the most vulnerable corners of the packaging and significantly improves the packaging bag's resistance to deformation when heated.

[0046] Specifically: the outer surface of the polyester film layer 3 is coated with a high-temperature resistant matte coating.

[0047] Working principle: The aluminum foil layer 4 forms the basis of the barrier function, which can absolutely block oxygen, water vapor, light and odors, ensuring the stability and safety of the contents during long-term storage. The connection is achieved by using a modified polypropylene adhesive 8 between the nylon film layer 5 and the polypropylene composite film layer 6. The active groups in the modified polypropylene adhesive 8 can form strong chemical bonds with nylon molecules, while its polypropylene main chain diffuses and intertwines with the inner polypropylene molecular chain, overcoming the defect of easy hydrolysis and degradation of traditional polyurethane adhesive 7 at this interface. This eliminates the risk of barrier failure and air leakage caused by delamination, and achieves long-term storage reliability. The nylon film layer 5, with its extremely high toughness, impact resistance and bending resistance, can effectively resist the puncture of objects. Through the above-mentioned strong bonding interface, the toughness of the nylon film layer 5 is completely combined with the external strength of the polyester film layer 3, the rigid support of the aluminum foil layer 4 and the flexible buffer of the polypropylene composite film layer 6 into a solid whole, making the puncture resistance of the packaging bag far exceed that of ordinary structures.

[0048] In order to firmly integrate the aluminum foil layer 4 into the structure, both sides are bonded with high-performance polyurethane adhesive 7, thereby forming a high-temperature resistant and high-strength connection, ensuring the integrity of the basic structure during the high-temperature cooking sterilization process.

[0049] In addition, the mesh-type concave and convex reinforcing ribs 13 set on the outer surface of the bag body 1 further enhance the overall rigidity and compressive strength of the bag body 1, effectively preventing deformation or damage caused by external pressure during stacking and transportation. At the same time, the arc-shaped thickened area 14 set at the corner of the bag body 1 and the high-temperature resistant fiber mesh embedded inside it are reinforcement designs for the most vulnerable corners of the packaging, which significantly improves the packaging bag's resistance to deformation when heated.

[0050] During the high-temperature cooking sterilization process, the air and water vapor generated inside the bag due to heat expansion are discharged through the micro-perforations 10 on the heat-fusible shrinkable film strip 9 covering the exhaust port, thus preventing the bag body 1 from continuously expanding.

[0051] The protective film 11 on the outside of the exhaust port is attached to the outside of the exhaust port by the adhesive layer 12, providing physical protection for the exhaust port. The protective film 11 can be torn off in front of the heating bag body 1.

[0052] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0053] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

Claims

1. A high-temperature resistant composite flexible can packaging bag, characterized in that, Includes a bag body (1), which is formed by heat sealing the edges. The bag body (1) is made of a composite film (2), which comprises, from the outside to the inside: Polyester film layer (3); Aluminum foil layer (4); Nylon film layer (5); Polypropylene composite film layer (6); The aluminum foil layer (4) is fixedly connected to the polyester film layer (3) and the nylon film layer (5) on both sides by polyurethane adhesive (7), and the nylon film layer (5) is fixedly connected to the polypropylene composite film layer (6) by modified polypropylene adhesive (8). The bag body (1) has an exhaust port near the top, and the exhaust port is covered with a heat-sealable shrinkable film strip (9), and the film strip (9) has micro-perforations (10). A protective film (11) is provided on the outside of the exhaust port, and a layer of adhesive (12) is provided around the lower surface of the protective film (11). The bag body (1) has an arc-shaped thickened area (14) at the corner of the interior, and the arc-shaped thickened area (14) is embedded with a high-temperature resistant fiber mesh.

2. The high-temperature resistant composite flexible can packaging bag according to claim 1, characterized in that, The outer surface of the bag body (1) is provided with concave and convex reinforcing ribs (13), which are distributed in a grid pattern.

3. The high-temperature resistant composite flexible can packaging bag according to claim 1, characterized in that, The thickness of the aluminum foil layer (4) is 7-9 μm.

4. The high-temperature resistant composite flexible can packaging bag according to claim 1, characterized in that, The outer surface of the polyester film layer (3) is coated with a high-temperature matte coating.

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