Full-degradable tensile and tear-resistant food packaging film

Abstract

The utility model relates to a full-degradable tensile and tear-resistant food packaging film which comprises a base layer, a tear-resistant layer arranged on the upper surface of the base layer, a reinforcing layer arranged on the upper surface of the tear-resistant layer, a tensile layer arranged on the upper surface of the reinforcing layer, an antibacterial layer arranged on the lower surface of the base layer, and an adsorption layer arranged on the lower surface of the antibacterial layer. The reinforcing layer is composed of elastic reinforcing strips arranged in a criss-cross mode. The packaging film disclosed by the utility model has excellent tensile and tear resistance, good antibacterial property and adsorbability and complete biodegradability.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging films, in particular to a fully degradable, tensile-resistant and tear-resistant food packaging film. Background Art

[0002] With the improvement of environmental awareness and the promotion of sustainable development goals, the food packaging industry has a growing demand for fully degradable packaging materials. Although traditional plastic packaging films have good physical properties and economic efficiency, they are difficult to degrade after use and are prone to environmental pollution. Therefore, the development of fully degradable food packaging films that can not only meet the protective function of food packaging but also be completely degraded after use has become an important research topic.

[0003] Existing fully degradable food packaging films are mainly made of biodegradable polymers such as polylactic acid (PLA), polyhydroxyalkanoates (PHA), polycaprolactone (PCL), etc. These materials can be decomposed into water and carbon dioxide by microorganisms under appropriate environmental conditions, reducing the impact on the environment. However, in practical applications, fully degradable food packaging films often face the problem of insufficient tensile strength and tear resistance, which makes the packaging film easy to break during food transportation, storage, and sales, affecting the protection effect of food and the consumer's experience.

[0004] In view of the above problems, the present application proposes a fully degradable tensile and tear-resistant food packaging film. Utility Model Content

[0005] In view of the deficiencies in the background technology, the utility model provides a fully degradable tensile and tear-resistant food packaging film.

[0006] The technical solution adopted by the utility model is: a fully degradable tensile and tear-resistant food packaging film, comprising a base layer, an anti-tear layer is provided on the upper surface of the base layer, a reinforcing layer is provided on the upper surface of the anti-tear layer, an anti-tensile layer is provided on the upper surface of the reinforcing layer, an anti-bacterial layer is provided on the lower surface of the base layer, an adsorption layer is provided on the lower surface of the antibacterial layer, and the reinforcing layer is elastic reinforcing strips arranged in a criss-cross manner.

[0007] Furthermore, the elastic reinforcement strip is a strip-shaped thermoplastic elastomer.

[0008] Furthermore, the parallel distance between the elastic reinforcement strips is 100 μm-200 μm.

[0009] Furthermore, the base layer is polylactic acid or polyhydroxyalkanoate.

[0010] Furthermore, the tear-resistant layer is a biodegradable fiber layer.

[0011] Furthermore, the tensile layer is made of polylactic acid long fibers.

[0012] Furthermore, the antibacterial layer is an antibacterial coating containing natural antibacterial agents or biodegradable antibacterial polymers.

[0013] Furthermore, the adsorption layer is biodegradable porous polymer foam or biodegradable adsorption resin.

[0014] The beneficial effects of the utility model are as follows: the present application forms a multi-layer composite structure by sequentially arranging an anti-tear layer, a reinforcing layer, and an anti-tensile layer on a base layer, and arranging an antibacterial layer and an adsorption layer under the base layer. Among them, the reinforcing layer adopts a criss-cross elastic reinforcing strip design, which can not only effectively disperse stress and significantly improve the tensile and tear strength of the packaging film, but also ensure the full degradability of the packaging film. In addition, the integrated antibacterial layer and adsorption layer respectively provide good antibacterial protection and dehumidification functions, which help to extend the shelf life of food and improve the overall performance of the packaging. Therefore, the packaging film of the present application has excellent tensile and tear resistance, good antibacterial and adsorption properties, and complete biodegradability.

[0015] In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 1 Middle: 1. Base layer; 2. Tear-resistant layer; 3. Reinforcement layer; 4. Tensile-resistant layer; 5. Antibacterial layer; 6. Adsorption layer; 7. Elastic reinforcement strip. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] The utility model provides a fully degradable tensile and tear-resistant food packaging film.

[0022] In this embodiment, refer to Figure 1 The fully degradable tensile and tear-resistant food packaging film includes a base layer 1, a tear-resistant layer 2 is provided on the upper surface of the base layer, a reinforcement layer 3 is provided on the upper surface of the tear-resistant layer, a tensile layer 4 is provided on the upper surface of the reinforcement layer, an antibacterial layer 5 is provided on the lower surface of the base layer, an adsorption layer 6 is provided on the lower surface of the antibacterial layer, and the reinforcement layer is elastic reinforcement strips 7 arranged in a criss-cross pattern.

[0023] In the above technical solution, a multi-layer composite structure is formed by sequentially arranging an anti-tear layer, a reinforcing layer, and an anti-tensile layer on the base layer, and arranging an antibacterial layer and an adsorption layer under the base layer. Among them, the reinforcing layer adopts a criss-cross elastic reinforcing strip design. This structure can not only effectively disperse stress and significantly improve the tensile and tear strength of the packaging film, but also ensure the full degradability of the packaging film. In addition, the integrated antibacterial layer and adsorption layer provide good antibacterial protection and dehumidification functions, respectively, which helps to extend the shelf life of food and improve the overall performance of the packaging. Therefore, the packaging film of the present application has excellent tensile and tear resistance, good antibacterial and adsorption properties, and complete biodegradability.

[0024] Specifically, the elastic reinforcement strip is a strip-shaped thermoplastic elastomer; the parallel distance between the elastic reinforcement strips is 100 μm-200 μm.

[0025] The elastic reinforcement strip of the present application is made of thermoplastic elastomer material. This type of material has both the plasticity of plastic and the elasticity of rubber. It can deform and quickly return to its original shape when subjected to stress such as stretching and tearing, providing strong mechanical support for the packaging film. At the same time, thermoplastic elastomers have good biodegradability, ensuring the full degradation characteristics of the entire packaging film. The use of thermoplastic elastomers as elastic reinforcement strips not only significantly enhances the tensile and tear resistance of the packaging film, but also ensures its environmental protection properties, which is conducive to achieving green packaging goals. In addition, the parallel distance between the medium elastic reinforcement strip and the elastic reinforcement strip is set to 100μm-200μm. This specific spacing range takes into account both mechanical properties and production costs, so that it can meet high tensile and tear resistance requirements while maintaining good economy.

[0026] Specifically, the base layer is polylactic acid or polyhydroxyalkanoate.

[0027] The base layer is made of polylactic acid (PLA) or polyhydroxyalkanoate (PHA), both of which are polymers with excellent biodegradability. They not only have good mechanical properties and are suitable for food packaging, but also can be completely degraded into harmless substances under appropriate environmental conditions after use, meeting environmental protection requirements. Choosing these two materials as the base layer ensures that the basic structure of the packaging film has excellent biodegradability and good food contact safety.

[0028] Specifically, the tear-resistant layer is a biodegradable fiber layer.

[0029] The tear-resistant layer is made of biodegradable fiber, such as polylactic acid fiber, polycaprolactone fiber, etc. These fiber materials have high elongation at break and good toughness, which can effectively resist crack propagation when the packaging film is subjected to tearing force, and significantly improve the tear resistance of the packaging film. At the same time, the use of biodegradable fiber maintains the full degradation characteristics of the packaging film, which meets the requirements of green environmental protection.

[0030] Specifically, the tensile layer is polylactic acid long fiber.

[0031] The tensile layer is made of polylactic acid long fibers, which have the characteristics of high strength and high modulus. As a tensile layer, it can significantly improve the tensile strength of the packaging film. Placing it on the upper layer of the packaging film structure can directly resist external tension and effectively prevent the packaging film from being damaged due to stretching during transportation and storage. The biodegradability of polylactic acid long fibers also ensures the full degradation properties of the entire packaging film.

[0032] Specifically, the antibacterial layer is an antibacterial coating containing natural antibacterial agents or biodegradable antibacterial polymers.

[0033] The antibacterial layer uses an antibacterial coating containing natural antibacterial agents or biodegradable antibacterial polymers. These antibacterial ingredients can effectively inhibit the growth of bacteria and mold on the surface and inside of the packaging film, reduce the risk of food contamination, and extend the shelf life of food. At the same time, the selected antibacterial agent is biodegradable and will not produce harmful residues during the degradation of the packaging film, ensuring the environmental safety of the entire packaging system.

[0034] Specifically, the adsorption layer is biodegradable porous polymer foam or biodegradable adsorption resin.

[0035] The adsorption layer uses biodegradable porous polymer foam or biodegradable adsorption resin. These materials have high specific surface area and good adsorption capacity. They can effectively absorb moisture, oxygen and other gases that affect food quality generated during the packaging process to maintain the freshness of the food. In addition, these adsorption materials also have good biodegradability, ensuring the overall degradation performance of the packaging film and meeting environmental protection requirements. The use of such adsorption layers further improves the functionality of the packaging film, making it not only effectively protect food, but also provide a good preservation effect.

[0036] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the concept of the utility model is not limited to this utility model. Any modification using the concept of the utility model will be included in the scope of protection of this patent right.

Claims

1. A fully degradable tensile and tear-resistant food packaging film, comprising a base layer, characterized in that: The upper surface of the base layer is provided with a tear-resistant layer, the upper surface of the tear-resistant layer is provided with a reinforcement layer, the upper surface of the reinforcement layer is provided with a tensile layer, the lower surface of the base layer is provided with an antibacterial layer, the lower surface of the antibacterial layer is provided with an adsorption layer, and the reinforcement layer is elastic reinforcement strips arranged in a criss-cross pattern.

2. The fully degradable tensile and tear-resistant food packaging film according to claim 1, characterized in that: The elastic reinforcement strip is a strip-shaped thermoplastic elastomer.

3. The fully degradable tensile and tear-resistant food packaging film according to claim 1, characterized in that: The parallel distance between the elastic reinforcement strips is 100 μm-200 μm.

4. The fully degradable tensile and tear-resistant food packaging film according to claim 2, characterized in that: The base layer is polylactic acid or polyhydroxyalkanoate.

5. The fully degradable tensile and tear-resistant food packaging film according to claim 1, characterized in that: The tear-resistant layer is a biodegradable fiber layer.

6. The fully degradable tensile and tear-resistant food packaging film according to claim 1, characterized in that: The tensile layer is made of polylactic acid long fibers.

7. The fully degradable tensile and tear-resistant food packaging film according to claim 1, characterized in that: The antibacterial layer is an antibacterial coating containing natural antibacterial agents or biodegradable antibacterial polymers.

8. The fully degradable tensile and tear-resistant food packaging film according to claim 1, characterized in that: The adsorption layer is biodegradable porous polymer foam or biodegradable adsorption resin.

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