Degradable antibacterial preservative film

Abstract

The utility model relates to the technical field of preservative films, and discloses a degradable antibacterial preservative film which comprises a preservative film body, one side of the preservative film body is provided with a breakpoint, the preservative film body comprises an antibacterial layer, the upper end of the antibacterial layer is covered with an oiled paper base film layer, the upper end of the oiled paper base film layer is covered with a middle barrier layer, and the upper end of the middle barrier layer is covered with a waterproof layer. And the upper end of the barrier middle layer is covered with a protective outer layer. The oil paper base film layer is high in environment-friendly and degradable degree, safe and non-toxic and free of chemical substance migration during use, the use safety of food is guaranteed, natural plant fiber paper serves as a base material and is subjected to dipping treatment through the edible-grade tung oil and the linseed oil, microorganism breeding is restrained through the antibacterial layer, the shelf life of articles is prolonged, and the food quality guarantee period is prolonged. The nano-silver particles and the natural plant antibacterial extract active ingredients are adopted, and the nano-silver particles are small in particle size and can continuously release silver ions, destroy bacterial cell membranes and interfere metabolism of the bacterial cell membranes.

Description

Technical Field

[0001] This utility model relates to the field of food preservation film technology, specifically a biodegradable antibacterial food preservation film. Background Technology

[0002] Plastic wrap is a type of plastic film used to wrap food, tableware, and other items to keep them fresh, prevent spoilage, keep them dry, and prevent cross-contamination of flavors.

[0003] The use of plastic wrap is increasing daily. Traditional products are mostly based on non-degradable plastics, such as polyethylene and polyvinyl chloride. After being discarded, they take hundreds of years to degrade in the soil, causing soil compaction, water pollution, and an unbearable burden on the ecosystem. There is a need to develop a biodegradable antibacterial plastic wrap that is easy to use.

[0004] Chinese Patent Publication No. CN215882804U discloses "A Degradable Food Preservation Film", which includes a film body, a heat-resistant layer, and a softening layer. A roll is installed on the inner side of the film body, and tear structures are uniformly arranged on the outer surface of the film body. The film body is composed of heat-resistant and softening layer materials, and the raw materials used in the film body are all biodegradable and will not cause harm to the human body. The heat-resistant layer is installed at the bottom of the film body, and a softening layer is installed on the upper surface of the heat-resistant layer. A base layer is installed on the upper surface of the softening layer, a waterproof layer is installed on the upper surface of the base layer, and a wear-resistant layer is installed on the upper surface of the waterproof layer. This utility model uses limiting blocks uniformly installed on the outer surface of the film body. When using the film body, pulling the limiting blocks causes the connecting blocks to break, allowing the limiting blocks to be removed from the inside of the limiting groove, thereby making it easy to tear off the film body, ensuring the integrity of the film body, and improving the convenience of using the film body.

[0005] The aforementioned prior art, by uniformly installing limiting blocks on the outer surface of the membrane body, allows the connecting block to break when the membrane body is used. This enables the limiting block to be easily removed from the limiting groove, thus ensuring the integrity of the membrane body and improving its ease of use. However, the existing devices have a low degree of environmental degradability and lack safe and non-toxic properties. They are also prone to chemical migration during use, affecting the safety of food use. Utility Model Content

[0006] The purpose of this invention is to provide a biodegradable antibacterial preservation film to solve the problems mentioned in the background art, such as low degree of environmental protection and biodegradability, lack of safety and non-toxicity, and easy migration of chemical substances during use, which affects the safety of food use.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a biodegradable antibacterial preservation film, comprising a preservation film body, wherein a break is provided on one side of the preservation film body, the preservation film body includes an antibacterial layer, an oil paper base film layer is covered at the upper end of the antibacterial layer, a barrier middle layer is covered at the upper end of the oil paper base film layer, and a protective outer layer is covered at the upper end of the barrier middle layer.

[0008] Preferably, the cling film body has breaks at intervals.

[0009] Preferably, the antibacterial layer uses nano-silver particles and natural plant antibacterial extracts as active ingredients.

[0010] Preferably, the oil paper base film layer uses natural plant fiber paper as the substrate and is impregnated with food-grade tung oil and linseed oil.

[0011] Preferably, the barrier middle layer is made of a blend of biodegradable materials such as modified starch and chitin.

[0012] Preferably, the protective outer layer is a biodegradable plastic blend of polylactic acid and polyhydroxyalkanoates.

[0013] Preferably, the oil paper base film layer and the barrier middle layer are bonded together by hot pressing, and the barrier middle layer and the protective outer layer are bonded together by hot pressing.

[0014] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0015] First, the oil-paper base film layer of this utility model is highly environmentally friendly and biodegradable, safe and non-toxic, and there is no chemical migration during use, ensuring the safety of food use. It uses natural plant fiber paper as the base material and is treated with food-grade tung oil and linseed oil. The linseed paper is soft and tough with fine fibers, which gives the base film basic toughness. The oil fills the gaps between the fibers, forming a hydrophobic barrier, which has excellent waterproof and moisture-proof performance. It is environmentally friendly and biodegradable, and the degradation products are pollution-free, which is in line with the concept of sustainable development.

[0016] Secondly, this utility model inhibits the growth of microorganisms and extends the shelf life of products by setting an antibacterial layer. It uses nano-silver particles and natural plant antibacterial extracts as active ingredients. The nano-silver particles are small in size and can continuously release silver ions, which destroy the bacterial cell membrane and interfere with its metabolism, effectively fighting common pathogenic microorganisms such as Escherichia coli and Staphylococcus aureus. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the antibacterial layer and the oil paper base film layer of this utility model.

[0020] In the diagram: 1. Plastic wrap body; 2. Break point; 3. Antibacterial layer; 4. Oil paper base film layer; 5. Barrier middle layer; 6. Protective outer layer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-3 A biodegradable antibacterial food preservation film includes a food preservation film body 1, a break point 2 on one side of the food preservation film body 1, an antibacterial layer 3, an oil paper base film layer 4 covering the upper end of the antibacterial layer 3, a barrier middle layer 5 covering the upper end of the oil paper base film layer 4, and a protective outer layer 6 covering the upper end of the barrier middle layer 5.

[0023] Through the above technical solution, the oil paper base film layer 4 is highly environmentally friendly and biodegradable, safe and non-toxic, and there is no chemical migration during use, ensuring the safety of food use. Using natural plant fiber paper as the base material, it is impregnated with food-grade tung oil and linseed oil. The linseed paper is soft and tough with fine fibers, giving the base film basic toughness. The oil fills the gaps between the fibers, forming a hydrophobic barrier, which has excellent waterproof and moisture-proof performance. It is environmentally friendly and biodegradable, and the degradation products are pollution-free, which is in line with the concept of sustainable development. The antibacterial layer 3 inhibits the growth of microorganisms and extends the shelf life of the product. It uses nano-silver particles and natural plant antibacterial extracts as active ingredients. The nano-silver particles are small in size and can continuously release silver ions, destroying bacterial cell membranes and interfering with their metabolism, effectively fighting common pathogenic microorganisms such as Escherichia coli and Staphylococcus aureus.

[0024] Specifically, the plastic wrap body 1 has breakpoints 2 at intervals.

[0025] The above technical solution allows the cling film body 1 to be easily divided into certain sizes using the breakpoint 2, making it convenient to use.

[0026] Specifically, the antibacterial layer 3 uses nano-silver particles and natural plant antibacterial extracts as active ingredients.

[0027] Through the above technical solution, the nano-silver particles in the antibacterial layer 3 are controlled to have a particle size of 10-30 nanometers and are uniformly dispersed in an aqueous polyurethane carrier at a concentration of 0.5%-1%. They work synergistically with natural plant antibacterial extracts to ensure the antibacterial rate against common pathogenic microorganisms such as Escherichia coli and Staphylococcus aureus.

[0028] Specifically, the oil paper base film layer 4 uses natural plant fiber paper as the substrate and is treated with food-grade tung oil and linseed oil.

[0029] Through the above technical solution, the oil paper base film layer 4 uses flax fiber paper as the natural plant fiber paper substrate, and is immersed in a 3:2 mixture of tung oil and flaxseed oil at 60-70℃ for 30-40 minutes, and then dried and cured at 100-110℃.

[0030] Specifically, the barrier middle layer 5 is made of a blend of biodegradable materials such as modified starch and chitin.

[0031] Through the above technical solution, the barrier middle layer 5 is made by mixing corn starch and cassava starch in a 2:1 ratio, modifying it by esterification, and then mixing in 10%-15% chitin powder. The middle layer with a thickness of 0.03-0.05 mm is then produced by casting.

[0032] Specifically, the outer protective layer 6 is made of a biodegradable plastic blend of polylactic acid and polyhydroxyalkanoates.

[0033] Through the above technical solution, the protective outer layer 6 is made of biodegradable plastic blended with polylactic acid and polyhydroxy fatty acid ester in a mass ratio of 3:2. After being melt-extruded into a film, it is immersed in vegetable oil mixed with sunflower seed oil and olive oil in a 1:1 ratio at an oil temperature of 70-80℃ for 10-15 minutes, which improves the wear resistance and puncture resistance of the outer layer.

[0034] Specifically, the oil paper base film layer 4 and the barrier middle layer 5 are bonded together by hot pressing, and the barrier middle layer 5 and the protective outer layer 6 are bonded together by hot pressing.

[0035] Through the above technical solution, the layers of the cling film body 1 are tightly bonded together and hot-pressed to improve tensile strength, effectively preventing separation and wrinkling of the layers, and ensuring the stable performance of preservation, antibacterial, barrier and degradation properties.

[0036] When safety and non-toxicity are required during use, an oil paper base film layer 4 is set on top of the antibacterial layer 3. This layer uses natural plant fiber paper as the substrate and is treated with edible tung oil and linseed oil. The linseed paper is flexible and has fine fibers, giving the base film basic toughness. The oil fills the gaps between the fibers, forming a hydrophobic barrier, providing excellent waterproof and moisture-proof performance. It is environmentally friendly, biodegradable, safe, and non-toxic, preventing the migration of chemical substances and ensuring the safety of food use. When it is necessary to inhibit microbial growth and extend the shelf life of products, the antibacterial layer 3 uses nano-silver particles and natural plant antibacterial extracts. The nano-silver particles are tiny and can continuously release silver ions, destroying bacterial cell membranes and interfering with their metabolism. This effectively combats common pathogenic microorganisms such as Escherichia coli and Staphylococcus aureus, improving food safety.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of this application. The scope of this application is defined by the appended claims and their equivalents.

Claims

1. A degradable antibacterial preservative film comprising a preservative film body (1), characterized in that: The fresh-keeping film body (1) is provided with a breakpoint (2) on one side, the fresh-keeping film body (1) comprises an antibacterial layer (3), the upper end of the antibacterial layer (3) is covered with an oil paper base film layer (4), the upper end of the oil paper base film layer (4) is covered with a barrier middle layer (5), and the upper end of the barrier middle layer (5) is covered with a protective outer layer (6).

2. The degradable antibacterial preservative film according to claim 1, characterized in that: The fresh-keeping film body (1) is provided with a breakpoint (2) at a distance.

3. The degradable antibacterial preservative film according to claim 1, characterized in that: The antibacterial layer (3) adopts nano-silver particles and natural plant antibacterial extract active ingredients.

4. The degradable antibacterial preservative film according to claim 1, characterized in that: The oil paper base film layer (4) adopts natural plant fiber paper as a base material and is impregnated with edible-grade tung oil and flaxseed oil.

5. The degradable antibacterial preservative film according to claim 1, characterized in that: The barrier middle layer (5) is made of modified starch and chitin degradable material.

6. The degradable antibacterial preservative film according to claim 1, characterized in that: The protective outer layer (6) adopts a degradable plastic blend of polylactic acid and polyhydroxyalkanoate.

7. The degradable antibacterial preservative film according to claim 1, characterized in that: The oil paper base film layer (4) and the barrier middle layer (5) are bonded together by hot pressing, and the barrier middle layer (5) and the protective outer layer (6) are bonded together by hot pressing.

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