A biodegradable inner film for food packaging

Abstract

This utility model relates to the field of food preservation inner film technology, and discloses a biodegradable food packaging inner film, including a storage box. The storage box contains a food preservation film, which includes an outer layer, a functional layer tightly adhered to the inner wall of the outer layer, a middle layer tightly adhered to the inner wall of the functional layer, an inner layer tightly adhered to the inner wall of the middle layer, and a contact layer tightly adhered to the inner wall of the inner layer. In this utility model, the food packaging inner film incorporates a functional layer made of polyvinyl alcohol, a middle layer made of bio-based adhesive, and an inner layer made of polylactic acid. The polyvinyl alcohol functional layer, while possessing good degradation capabilities, maintains a low permeation rate under different storage conditions, improving food preservation. Combined with the polylactic acid inner layer, it enhances the interfacial stability between the inner film and the food, reducing performance degradation caused by moisture and component migration.

Description

Technical Field

[0001] This utility model relates to the field of preservation inner film technology, and in particular to a biodegradable food packaging inner film. Background Technology

[0002] The inner film of food packaging refers to the thin film material located inside the packaging that comes into direct contact with the food. Its main purpose is to inhibit the penetration of oxygen, moisture, gases and microorganisms through low permeability, slow down food oxidation, moisture loss and spoilage, help extend shelf life, help maintain flavor, taste, color and texture, and prevent moisture loss or excessive moisture absorption that leads to quality decline.

[0003] However, traditional inner membranes are usually composed of a single material or a double-layer material. This makes it difficult to achieve a stable and high level of oxygen or water vapor barrier effect while increasing the degradation rate. This reduces the food preservation effect when storage conditions change, thus affecting the effectiveness of the inner membrane.

[0004] Therefore, those skilled in the art have provided a biodegradable inner film for food packaging to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a biodegradable food packaging inner film. This food packaging inner film is made of a functional layer of polyvinyl alcohol, a middle layer of bio-based adhesive, and an inner layer of polylactic acid. The polyvinyl alcohol functional layer has good degradation ability and can maintain a low permeation rate under different storage conditions, thereby improving the food preservation effect. Combined with the polylactic acid inner layer, it can improve the interfacial stability between the inner film and the food, and reduce the performance degradation caused by moisture and component migration.

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

[0007] A biodegradable food preservation packaging inner film includes a storage box, the storage box having a preservation film inside, the preservation film including an outer layer, a functional layer tightly adhered to the inner wall of the outer layer, a middle layer tightly adhered to the inner wall of the functional layer, an inner layer tightly adhered to the inner wall of the middle layer, and a contact layer tightly adhered to the inner wall of the inner layer.

[0008] Through the above technical solution, the middle layer of the bio-based adhesive material can reduce the tightness of the connection between the functional layer and the inner layer, thereby improving the effectiveness of the functional layer and the inner layer. As a result, the inner film of the food preservation packaging can improve the food protection effect while being biodegradable.

[0009] Furthermore, the outer layer is made of polyhydroxyalkanoate material;

[0010] Through the above technical solution, polyhydroxyalkanoate material is a bio-based biodegradable polyester synthesized by microorganisms, which has good toughness, elasticity and certain impact resistance.

[0011] Furthermore, the functional layer is made of polyvinyl alcohol.

[0012] Through the above technical solutions, polyvinyl alcohol material can greatly prevent external oxygen from penetrating into the packaging, thereby effectively slowing down the oxidation and rancidity of food and the growth of microorganisms, and extending the shelf life.

[0013] Furthermore, the middle layer is made of a bio-based adhesive material;

[0014] Through the above technical solution, the bio-based adhesive material can firmly bond the functional layer to the adjacent inner and outer layers.

[0015] Furthermore, the inner layer is made of polylactic acid.

[0016] Furthermore, the contact layer is made of PLA transparent substrate material;

[0017] Through the above technical solutions, polylactic acid (PLA) material and PLA transparent substrate material are made from plant resources such as corn and cassava. Their monomer is lactic acid, which is a recognized safe and non-toxic bio-based material. It is very suitable for direct contact with food and there is no risk of migration of harmful substances such as plasticizers.

[0018] Furthermore, the storage box includes a bottom box, and a top cover is hinged to the rear end of the upper surface of the bottom box;

[0019] The above technical solution allows users to store the cling film by opening and closing the top cover.

[0020] Furthermore, a positioning block is fixedly connected to the middle of the inner wall on both sides of the bottom box, and a storage tube is snapped into the outer wall of the positioning block, with the outer layer disposed on the outer wall of the storage tube;

[0021] The above technical solution enables the storage tube to wrap and store the cling film inside the bottom box.

[0022] This utility model has the following beneficial effects:

[0023] 1. This utility model proposes a biodegradable food packaging inner film. Compared with most traditional food packaging inner films, this food packaging inner film adds a functional layer made of polyvinyl alcohol, a middle layer made of bio-based adhesive, and an inner layer made of polylactic acid. The polyvinyl alcohol functional layer has good degradation ability and can maintain a low permeation rate under different storage conditions, thus improving the food preservation effect. Combined with the polylactic acid inner layer, it can improve the interfacial stability between the inner film and the food, reduce the performance degradation caused by moisture and component migration, and the bio-based adhesive middle layer can reduce the tightness of the connection between the functional layer and the inner layer, thereby improving the effectiveness of the functional layer and the inner layer. Thus, this food packaging inner film can improve the food protection effect while being biodegradable. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a biodegradable inner film for food packaging proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of a storage box for a biodegradable inner film for food packaging proposed in this utility model.

[0026] Figure 3 This is a cross-sectional view of a biodegradable inner film for food packaging proposed in this utility model.

[0027] Figure 4 This is a schematic diagram of the structure of a biodegradable food packaging inner film proposed in this utility model.

[0028] Legend: 1. Storage box; 101. Bottom box; 102. Top cover; 103. Positioning block; 104. Storage tube; 2. Plastic wrap; 201. Outer layer; 202. Functional layer; 203. Middle layer; 204. Inner layer; 205. Contact layer. Detailed Implementation

[0029] 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.

[0030] One embodiment provided by this utility model:

[0031] Reference Figure 1 , 34. A biodegradable food preservation packaging inner film includes a storage box 1, with a preservation film 2 disposed inside the storage box 1. The preservation film 2 includes an outer layer 201, a functional layer 202 tightly adhered to the inner wall of the outer layer 201, a middle layer 203 tightly adhered to the inner wall of the functional layer 202, an inner layer 204 tightly adhered to the inner wall of the middle layer 203, and a contact layer 205 tightly adhered to the inner wall of the inner layer 204. The middle layer 203, made of bio-based adhesive, can reduce the tightness of the connection between the functional layer 202 and the inner layer 204, thereby improving the effectiveness of the functional layer 202 and the inner layer 204. Thus, the food preservation packaging inner film can improve the food protection effect while being biodegradable.

[0032] Reference Figure 1 , 3 4. The outer layer 201 is made of polyhydroxyalkanoate (PHA), a biodegradable polyester synthesized by microorganisms, which has good toughness, elasticity, and a certain degree of impact resistance. The functional layer 202 is made of polyvinyl alcohol (PVA), which can greatly prevent external oxygen from penetrating into the packaging, thereby effectively slowing down the oxidation and rancidity of food and the growth of microorganisms, and extending the shelf life. The middle layer 203 is made of bio-based adhesive, which can firmly bond the functional layer 202 to the adjacent inner layer 204 and outer layer 201. The inner layer 204 is made of polylactic acid (PLA), and the contact layer 205 is made of PLA transparent substrate. PLA and PLA transparent substrate are made from plant resources such as corn and cassava. Their monomer is lactic acid, which is a recognized safe and non-toxic bio-based material, very suitable for direct contact with food, and there is no risk of migration of harmful substances such as plasticizers.

[0033] Reference Figure 1 , 2 The storage box 1 includes a bottom box 101. A top cover 102 is hinged to the rear end of the upper surface of the bottom box 101, so that the user can open and close the top cover 102 to store the plastic wrap 2. Positioning blocks 103 are fixedly connected to the middle of the inner walls on both sides of the bottom box 101. A storage tube 104 is engaged with the outer wall of the positioning block 103. An outer layer 201 is disposed on the outer wall of the storage tube 104, so that the storage tube 104 can wrap and store the plastic wrap 2 inside the bottom box 101.

[0034] Working principle: The outer layer 201 is made of polyhydroxyalkanoate, which not only has degradation capabilities but also improves the mechanical durability of the entire film, reducing the probability of damage during transportation and logistics; the functional layer 202 is made of polyvinyl alcohol, which not only has degradation capabilities but also provides the ability to maintain a low permeation rate under different storage conditions, thereby improving the food preservation effect; the middle layer 203 is made of bio-based adhesive, which not only has degradation capabilities but also reduces the tendency of delamination in the early stage of degradation, allowing the entire film to maintain structural integrity during the shelf life; the inner layer 204 is made of polylactic acid, which not only has degradation capabilities but also improves the interfacial stability between the inner film and food, reducing the performance degradation caused by moisture and component migration; the contact layer 205 is made of PLA transparent substrate, which not only has degradation capabilities but also reduces the impact on food.

[0035] The following points should be noted in this article:

[0036] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0037] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A biodegradable inner film for food packaging, comprising a storage box (1), characterized in that: The storage box (1) is provided with a plastic wrap (2) inside. The plastic wrap (2) includes an outer layer (201), a functional layer (202) is tightly attached to the inner wall of the outer layer (201), a middle layer (203) is tightly attached to the inner wall of the functional layer (202), an inner layer (204) is tightly attached to the inner wall of the middle layer (203), and a contact layer (205) is tightly attached to the inner wall of the inner layer (204).

2. The biodegradable food packaging inner film according to claim 1, characterized in that: The outer layer (201) is made of polyhydroxyalkanoate.

3. The biodegradable food packaging inner film according to claim 1, characterized in that: The functional layer (202) is made of polyvinyl alcohol.

4. The biodegradable food packaging inner film according to claim 1, characterized in that: The middle layer (203) is made of bio-based adhesive material.

5. The biodegradable food packaging inner film according to claim 1, characterized in that: The inner layer (204) is made of polylactic acid.

6. The biodegradable inner film for food packaging according to claim 1, characterized in that: The contact layer (205) is made of PLA transparent substrate material.

7. The biodegradable food packaging inner film according to claim 1, characterized in that: The storage box (1) includes a bottom box (101), and a top cover (102) is hinged to the rear end of the upper surface of the bottom box (101).

8. The biodegradable inner film for food packaging according to claim 7, characterized in that: Positioning blocks (103) are fixedly connected to the middle of the inner walls on both sides of the bottom box (101). The outer wall of the positioning block (103) is fitted with a storage tube (104). The outer layer (201) is set on the outer wall of the storage tube (104).

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