Biodegradable composite modified atmosphere fresh-keeping device for fruits and vegetables

Abstract

The utility model relates to the technical field of fresh-keeping devices, and discloses a biodegradable composite modified atmosphere fresh-keeping device for fruits and vegetables, which comprises a first thin film and a second thin film which are sequentially arranged from inside to outside, a sealing interlayer is formed between the first thin film and the second thin film, the first thin film is a biodegradable breathable film, and the second thin film is a biodegradable breathable film. The second thin film is a water-blocking film; the second film is a PE film and prevents water vapor from passing through; the first film is an oxygen barrier film, prevents oxygen from passing through and allows carbon dioxide gas and water vapor to pass through. According to the fruit and vegetable fresh-keeping device, a composite film structure is adopted, the first film on the inner layer is arranged to be the biodegradable breathable film, oxygen can be effectively blocked, the breathing process is restrained through carbon dioxide generated by breathing of fruits and vegetables, the gas environment in the fresh-keeping device is adjusted, the shelf life of the fruits and vegetables is prolonged, and the fresh-keeping effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fresh -keeping device technical field, specifically, a kind of biodegradable composite modified atmosphere fresh-keeping device for fruit and vegetable. BACKGROUND

[0002] Modified atmosphere fresh-keeping is a way to keep fruit and vegetable fresh, and it mainly forms a low-oxygen environment in the film by improving the oxygen barrier property of the film, so that the respiration of fruit and vegetable is greatly reduced and they are in a dormant state for preservation. However, when using the modified atmosphere fresh-keeping method, on the one hand, the moisture brought by fresh fruit and vegetable needs to be effectively released, otherwise water droplets may form on the surface of the film, which may breed a large number of bacteria and cause the fruit and vegetable to rot. On the other hand, if the water permeability is too high, it may also cause the fruit and vegetable to dry out and affect their freshness. Therefore, in order to effectively preserve fruit and vegetable, it is necessary to maintain the moisture without producing water mist or water droplets.

[0003] Therefore, it is necessary to provide a biodegradable composite modified atmosphere fresh-keeping device for fruit and vegetable to at least partially solve the problems existing in the prior art. SUMMARY

[0004] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the detailed description section. The summary section of the utility model does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, and even less to determine the protection scope of the claimed technical solution.

[0005] To solve the above problems, the utility model discloses a biodegradable composite modified atmosphere fresh-keeping device for fruit and vegetable; it includes:

[0006] The first film and the second film are arranged in sequence from inside to outside, and a sealed interlayer is formed between the first film and the second film. The first film is a biodegradable breathable film, and the second film is a water-blocking film.

[0007] Preferably, the second film is a PE film, and the second film prevents water vapor from passing through.

[0008] Preferably, the first film is an oxygen-blocking film, which prevents oxygen from passing through and allows carbon dioxide gas and water vapor to pass through.

[0009] Preferably, the thickness of the first film and the second film is 5-8 μm.

[0010] Preferably, the thickness of the sealed interlayer is 5-9 μm.

[0011] Preferably, a plurality of protruding portions are uniformly arranged on the second film, the thickness of the protruding portions is greater than the thickness of the second film, and the protruding ends of the protruding portions are connected to the first film.

[0012] Preferably, the second film is provided with an anti-static layer on the inner side.

[0013] Preferably, the second film is provided with a decorative layer on the outer side.

[0014] Preferably, the convex part is provided with a gas hole, the gas hole is provided through the second film and the first film, and the gas hole is connected with a fresh-keeping gas tank through a pipeline.

[0015] Preferably, the gas hole is provided with a gas injection valve.

[0016] Compared with the prior art, the utility model at least has following beneficial effects:

[0017] The biodegradable composite modified atmosphere fresh-keeping device for fruits and vegetables has the first film of the inner layer being a biodegradable breathable film, improving the oxygen barrier property, forming a low-oxygen environment in the film, greatly reducing the respiration of the fruits and vegetables, and keeping the fruits and vegetables in a dormant state, so that the gas environment in the fresh-keeping device is adjusted.

[0018] The biodegradable composite modified atmosphere fresh-keeping device for fruits and vegetables, other advantages, objects and features of the utility model will be partly embodied through the following description, and will be partly understood by the person skilled in the art through research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for the person skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0020] Fig. 1 It is a structural schematic diagram of the utility model;

[0021] Fig. 2 It is a first cross-sectional structural schematic diagram of the utility model;

[0022] Fig. 3 It is a second cross-sectional structural schematic diagram of the utility model.

[0023] In the drawing: 1. first film; 2. second film; 3. sealing interlayer; 4. convex part; 5. anti-static layer; 6. decorative layer; 7. gas hole. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] Example

[0026] The present invention will now be further described with reference to the accompanying drawings.

[0027] like Figs. 1-3 As shown in the figure, this embodiment provides a biodegradable composite modified atmosphere preservation device for fruits and vegetables, comprising:

[0028] A first film 1 and a second film 2 are arranged sequentially from the inside out, and a sealing interlayer 3 is formed between the first film 1 and the second film 2. The first film 1 is a biodegradable breathable membrane, and the second film 2 is a water-resistant membrane.

[0029] The second film 2 is a PE film, which prevents water vapor from passing through.

[0030] The first membrane 1 is configured as an oxygen barrier membrane, which prevents oxygen from passing through but allows carbon dioxide gas and water vapor to pass through.

[0031] The working principle and beneficial effects of this utility model are as follows:

[0032] This embodiment provides a biodegradable composite modified atmosphere preservation device for fruits and vegetables. The device adopts a composite film structure, including an inner first film 1 and an outer second film 2, with a sealing interlayer 3 formed between the first film 1 and the outer second film 2. The first film 1 is a biodegradable breathable membrane that can prevent oxygen from passing through while allowing carbon dioxide gas and water vapor to pass through. The second film 2 is set as a PE film that can prevent water vapor from passing through.

[0033] When using the device, fruits and vegetables are sealed inside the first film 1. The first film 1 effectively allows moisture to permeate while also providing a strong barrier against oxygen. During the respiration process of the fruits and vegetables, the remaining oxygen inside the first film 1 is converted into carbon dioxide, creating a low-oxygen environment within the film. This significantly reduces the respiration of the fruits and vegetables, putting them into a dormant state, thus regulating the gas environment within the preservation device and extending the shelf life of the fruits and vegetables. After moisture loss from the fruits and vegetables, it passes through the first film 1 into the sealed interlayer 3. The second film 2 has a very high barrier against water mist or droplets, causing the moisture to remain within the sealed interlayer 3. This maintains a certain level of humidity within the sealed interlayer 3, reducing moisture loss from the fruits and vegetables and extending their shelf life.

[0034] Among them, the first film 1 is a biodegradable breathable membrane. The biodegradable breathable membrane can be, for example, the biodegradable breathable membrane disclosed in the patent document with publication number CN114573963B, which has the characteristics of high permeability of carbon dioxide and water vapor and low permeability of oxygen. It is biodegradable and has good safety and environmental protection performance.

[0035] In one embodiment, the thickness of the first film 1 and the second film 2 is set to 5 to 8 μm.

[0036] In one embodiment, the thickness of the sealing interlayer 3 is set to 5–9 μm.

[0037] The working principle and beneficial effects of the above technical solution are as follows:

[0038] A sealing interlayer 3 of a certain thickness is formed between the first film 1 and the second film 2, so that it has enough space to accommodate water mist or water droplets, better store the moisture lost by fruits and vegetables, and thus ensure the humidity inside the sealing interlayer 3.

[0039] In one embodiment, a plurality of protrusions 4 are uniformly provided on the second film 2, the thickness of the protrusions 4 is greater than the thickness of the second film 2, and the protruding ends of the protrusions 4 are connected to the first film 1.

[0040] The working principle and beneficial effects of the above technical solution are as follows:

[0041] The second film 2 is connected to the first film 1 through the protrusion 4. Since the protrusion 4 is relatively thick, a gap can be formed between the second film 2 and the first film 1, which facilitates the formation of the sealing interlayer 3. The protrusion 4 is integrally formed, pressed or bonded to the second film 2. The protrusion 4 forms multiple connection points between the first film 1 and the second film 2, which limits the positional offset of the first film 1 and the second film 2 when the preservation device is in use, and improves the flatness of the preservation device.

[0042] In one embodiment, an antistatic layer 5 is provided on the inner side of the second film 2.

[0043] The working principle and beneficial effects of the above technical solution are as follows:

[0044] An antistatic layer 5 is provided on the inner side of the second film 2. The antistatic layer 5 is made of polyimide material to reduce the static electricity between the first film 1 and the second film 2, and to prevent the first film 1 and the second film 2 from sticking together due to static adsorption, which would compress the space of the sealing interlayer 3, resulting in a small amount of water mist or water droplets that can be contained, or excessive local water accumulation, thus ensuring the moisturizing effect of the device.

[0045] In one embodiment, a decorative layer 6 is provided on the outer side of the second film 2.

[0046] The working principle and beneficial effects of the above technical solution are as follows:

[0047] A decorative layer 6 is provided on the second film 2. The decorative layer 6 is coated with paint to print markings, production dates, or instructions for eating fruits and vegetables on the second film 2.

[0048] In one embodiment, the protrusion 4 is provided with an air hole 7, which is disposed through the second film 2 and the first film 1, and the air hole 7 is connected to the preservation gas cylinder through a pipeline.

[0049] An air injection valve is provided on the air vent 7.

[0050] The working principle and beneficial effects of the above technical solution are as follows:

[0051] An air hole 7 is provided on the protrusion 4. The air hole 7 is used to inflate the inside of the first film 1. An air injection valve is used to regulate the opening and closing of the air hole 7. The air hole 7 is connected to a preservative gas cylinder through a pipeline. The preservative gas is set as nitrogen, carbon dioxide or a combination of the two. The preservative gas cylinder injects a certain amount of preservative gas into the first film 1 to supplement the carbon dioxide produced by the respiration of fruits and vegetables. By actively regulating the gas environment inside the first film 1 through the modified atmosphere method, the respiration of fruits and vegetables is further inhibited, and the shelf life of fruits and vegetables is extended.

[0052] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A biodegradable composite modified atmosphere preservation device for fruits and vegetables, characterized in that, include: A first film (1) and a second film (2) are arranged sequentially from the inside out, and a sealing interlayer (3) is formed between the first film (1) and the second film (2). The first film (1) is set as a biodegradable breathable membrane, and the second film (2) is set as a water-resistant membrane.

2. The biodegradable composite modified atmosphere preservation device for fruits and vegetables according to claim 1, characterized in that, The second film (2) is a PE film, which prevents water vapor from passing through.

3. The biodegradable composite modified atmosphere preservation device for fruits and vegetables according to claim 1, characterized in that, The first membrane (1) is configured as an oxygen barrier membrane, which prevents oxygen from passing through and allows carbon dioxide gas and water vapor to pass through.

4. The biodegradable composite modified atmosphere preservation device for fruits and vegetables according to claim 1, characterized in that, The thicknesses of the first film (1) and the second film (2) are set to 5–8 μm.

5. A biodegradable composite modified atmosphere storage device for fruits and vegetables according to claim 1, characterized in that, The thickness of the sealing interlayer (3) is set to 5–9 μm.

6. A biodegradable composite modified atmosphere preservation device for fruits and vegetables according to claim 1, characterized in that, The second film (2) has a plurality of protrusions (4) uniformly arranged on it. The thickness of the protrusions (4) is greater than the thickness of the second film (2). The protruding ends of the protrusions (4) are connected to the first film (1).

7. A biodegradable composite modified atmosphere preservation device for fruits and vegetables according to claim 1, characterized in that, An antistatic layer (5) is provided on the inner side of the second film (2).

8. A biodegradable composite modified atmosphere storage device for fruits and vegetables according to claim 1, characterized in that, A decorative layer (6) is provided on the outer side of the second film (2).

9. A biodegradable composite modified atmosphere preservation device for fruits and vegetables according to claim 6, characterized in that, The protrusion (4) is provided with an air hole (7), which is provided through the second film (2) and the first film (1). The air hole (7) is connected to the preservation gas tank through a pipeline.

10. A biodegradable composite modified atmosphere preservation device for fruits and vegetables according to claim 9, characterized in that, An air injection valve is provided on the air hole (7).

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