A sandwich structure fresh-keeping packaging bag

Abstract

This utility model discloses a sandwich-structured fresh-keeping packaging bag, including a bag body comprising a tear-resistant outer layer, an antibacterial middle layer, and a microporous breathable inner layer. The inner surface of the tear-resistant outer layer is fixedly connected to the outer surface of the antibacterial middle layer, and the inner surface of the antibacterial middle layer is fixedly connected to the outer surface of the microporous breathable inner layer. A pH detection label is provided inside the bag body, and the pH detection label is partially connected and fixed to the bag body. In this technical solution, the tear-resistant outer layer is a corn starch-based biodegradable film, which is environmentally friendly and tear-resistant; the antibacterial middle layer is a tea polyphenol antibacterial coating that inhibits mold growth, with experimental results showing an antibacterial rate >85%; the microporous breathable inner layer balances humidity, keeping the humidity inside the bag stable at 80%-85%; and the pH detection label inside the bag contains a pH-sensitive dye that changes color according to the freshness of the fruit. The design is reasonable, provides good moisture retention, inhibits mold growth, facilitates timely detection of fruit spoilage, and is highly practical.

Description

Technical Field

[0001] This utility model relates to the field of food preservation technology, specifically to a sandwich-structured food preservation packaging bag. Background Technology

[0002] Fruits refer to juicy, mostly sweet plant fruits that can be eaten raw. They are not only rich in nutrients but also aid digestion. The term "fruit" is a general term for some edible plant fruits and seeds. Fruits have health benefits such as lowering blood pressure, slowing aging, aiding weight loss, skin care, improving eyesight, fighting cancer, and lowering cholesterol. However, fruit is a very perishable food; some fruits have a natural shelf life of only a few days. Therefore, preserving fruit is crucial. Due to the large quantity and yield of fruit, people generally use preservation bags for preservation. However, existing preservation bags have shortcomings: unreasonable structural design, poor moisture retention, and inability to detect fruit spoilage promptly. Often, once one fruit spoils, mold growth cannot be inhibited, easily leading to the rapid spread of bacteria to other fruits, causing widespread damage. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a sandwich structure preservation packaging bag with reasonable structural design, good moisturizing effect, ability to inhibit mold growth, easy to detect fruit spoilage in time, and good practicality.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a sandwich structure food preservation packaging bag, comprising a bag body, wherein the bag body comprises a tear-resistant outer layer, an antibacterial middle layer and a microporous breathable inner layer, wherein the inner surface of the tear-resistant outer layer is fixedly connected to the outer surface of the antibacterial middle layer, and the inner surface of the antibacterial middle layer is fixedly connected to the outer surface of the microporous breathable inner layer.

[0005] A pH testing label is installed inside the bag, and the pH testing label is partially connected and fixed to the bag body.

[0006] The present invention is further configured such that: the tear-resistant outer layer is a corn starch-based biodegradable membrane, the antibacterial middle layer is a tea polyphenol antibacterial coating, and the microporous breathable inner layer is a PET microporous breathable membrane, a PE microporous breathable membrane, a PA microporous breathable membrane, an OPP microporous breathable membrane, or a CPP microporous breathable membrane.

[0007] The present invention is further configured such that the pore size of the microporous breathable inner layer is between 0.01 and 1.5 mm.

[0008] The present invention is further configured such that: the bottom of the tear-resistant outer layer is integrally provided with a reinforced bottom surface, and the inner bottom surface of the reinforced bottom surface is provided with an upward-facing label mounting groove; the inner bottom surface of the antibacterial intermediate layer is provided with a label mounting through hole aligned with the upper port of the label mounting groove; the bottom of the pH detection label is installed in the label mounting groove, and the upper end face of the pH detection label is located in the label mounting through hole.

[0009] The present invention is further configured such that the pH detection label is a color-changing label with pH-sensitive dye or a smart detection label with pH sensor.

[0010] The present invention is further configured such that: a sealing strip is provided horizontally at the upper end of the bag near the opening of the bag, and a handle is integrally provided at the upper end of the bag.

[0011] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model has a reasonable structural design. The tear-resistant outer layer is a corn starch-based biodegradable film, which is environmentally friendly and tear-resistant. The antibacterial middle layer is a tea polyphenol antibacterial coating that inhibits mold growth. Experiments have shown that the antibacterial rate is >85%. The microporous breathable inner layer balances humidity, keeping the humidity inside the bag stable at 80%-85%. A pH detection label is installed inside the bag. The color-changing label contains pH-sensitive dye that changes color according to the freshness of the fruit: fresh → green, spoiled → red.

[0012] The above technical solution has a reasonable structural design, good moisturizing effect, can inhibit mold growth, facilitates timely detection of fruit spoilage, and is highly practical.

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0015] Figure 2 for Figure 1 Enlarged schematic diagram of part I in the middle. Detailed Implementation

[0016] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] See Figure 1 and Figure 2 The present invention discloses a sandwich structure food preservation packaging bag, including a bag body 1. The bag body 1 includes a tear-resistant outer layer 11, an antibacterial middle layer 12, and a microporous breathable inner layer 13. The inner surface of the tear-resistant outer layer 11 is fixedly connected to the outer surface of the antibacterial middle layer 12, and the inner surface of the antibacterial middle layer 12 is fixedly connected to the outer surface of the microporous breathable inner layer 13.

[0018] A pH testing label 2 is installed inside the bag body 1, and the pH testing label 2 is partially connected and fixed to the bag body 1.

[0019] Preferably, the tear-resistant outer layer 11, the antibacterial intermediate layer 12, and the microporous breathable inner layer 13 are bonded together or pressed to form an integral structure.

[0020] To make the structural design of this utility model more reasonable, as a preferred embodiment, the tear-resistant outer layer 11 is a corn starch-based biodegradable film. Corn starch-based biodegradable material is environmentally friendly and tear-resistant.

[0021] The antibacterial intermediate layer 12 is a tea polyphenol antibacterial coating that inhibits mold growth (experimental antibacterial rate >85%).

[0022] The microporous breathable inner layer 13 is a PET microporous breathable membrane, a PE microporous breathable membrane, a PA microporous breathable membrane, an OPP microporous breathable membrane, or a CPP microporous breathable membrane.

[0023] The pore size of the microporous breathable inner layer 13 is between 0.01 and 1.5 mm; it balances humidity (the humidity inside the bag is stable at 80%-85%).

[0024] The bottom of the tear-resistant outer layer 11 is integrally provided with a reinforced bottom surface 111. The inner bottom surface of the reinforced bottom surface 111 is provided with a label mounting groove 112 with an upward opening. The inner bottom surface of the antibacterial intermediate layer 12 is provided with a label mounting through hole 121 aligned with the upper port of the label mounting groove 112. The bottom of the pH detection label 2 is installed in the label mounting groove 112, and the upper end face of the pH detection label 2 is located in the label mounting through hole 121.

[0025] Preferably, the bottom of the pH testing label 2 is bonded and fixed to the inner bottom surface of the label mounting groove 112.

[0026] The pH detection tag 2 is either a color-changing tag with a pH-sensitive dye or a smart detection tag with a pH sensor.

[0027] As a preferred option, the color-changing label contains a pH-sensitive dye that changes color according to the freshness of the fruit (fresh → green, spoiled → red).

[0028] A sealing strip 3 is horizontally arranged at the upper end of the bag body 1 near the opening of the bag body, and a handle 4 is integrally provided at the upper end of the bag body 1. Preferably, the sealing strip 3 includes a sealing protrusion and a sealing groove. The sealing protrusion is integrally provided at the upper end of the front inner surface of the bag body, and the sealing groove is provided at the upper end of the rear inner surface of the bag body. The sealing protrusion is pressed into the sealing groove to form a seal.

[0029] In practical applications, the tear-resistant outer layer 11 is a corn starch-based biodegradable film, which is environmentally friendly and tear-resistant; the antibacterial middle layer 12 is a tea polyphenol antibacterial coating that inhibits mold growth, with an experimental antibacterial rate of >85%; the microporous breathable inner layer 13 balances humidity, keeping the humidity inside the bag stable at 80%-85%; a pH detection label 2 is installed inside the bag body 1, and the color-changing label contains pH-sensitive dye that changes color according to the freshness of the fruit: fresh → green, spoiled → red. The above technical solution has a reasonable structural design, good moisturizing effect, can inhibit mold growth, facilitates timely detection of fruit spoilage, and is highly practical.

[0030] The above description of the specific embodiments of this utility model is only used to further illustrate this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-essential improvements and adjustments made to this utility model by technical engineers based on the above description of the utility model shall fall within the scope of protection of this utility model.

Claims

1. A sandwich-structured food preservation packaging bag, comprising a bag body (1), characterized in that: The bag body (1) includes a tear-resistant outer layer (11), an antibacterial intermediate layer (12), and a microporous breathable inner layer (13). The inner surface of the tear-resistant outer layer (11) is fixedly connected to the outer surface of the antibacterial intermediate layer (12), and the inner surface of the antibacterial intermediate layer (12) is fixedly connected to the outer surface of the microporous breathable inner layer (13). A pH testing label (2) is provided inside the bag (1), and the pH testing label (2) is partially connected and fixed to the bag (1).

2. The sandwich-structured food preservation packaging bag according to claim 1, characterized in that: The tear-resistant outer layer (11) is a corn starch-based biodegradable membrane, the antibacterial middle layer (12) is a tea polyphenol antibacterial coating, and the microporous breathable inner layer (13) is a PET microporous breathable membrane, a PE microporous breathable membrane, a PA microporous breathable membrane, an OPP microporous breathable membrane, or a CPP microporous breathable membrane.

3. The sandwich-structured food preservation packaging bag according to claim 2, characterized in that: The pore size of the microporous breathable inner layer (13) is between 0.01 and 1.5 mm.

4. A sandwich-structured food preservation packaging bag according to claim 1 or 3, characterized in that: The bottom of the tear-resistant outer layer (11) is integrally provided with a reinforced bottom surface (111). The inner bottom surface of the reinforced bottom surface (111) is provided with an upward-facing label mounting groove (112). The inner bottom surface of the antibacterial intermediate layer (12) is provided with a label mounting through hole (121) aligned with the upper port of the label mounting groove (112). The bottom of the pH test label (2) is installed in the label mounting groove (112), and the upper end face of the pH test label (2) is located in the label mounting through hole (121).

5. A sandwich-structured food preservation packaging bag according to claim 4, characterized in that: The pH detection label (2) is either a color-changing label with pH-sensitive dye or a smart detection label with pH sensor.

6. A sandwich-structured food preservation packaging bag according to claim 1, characterized in that: A sealing strip (3) is provided horizontally at the upper end of the bag body (1) near the opening of the bag body, and a handle (4) is integrally provided at the upper end of the bag body (1).

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