Fresh-keeping sticker, fresh-keeping bag and fresh-keeping box

Abstract

This utility model discloses a food preservation label, comprising an air duct cloth and a core-pore membrane with overlapping upper and lower areas. The air duct cloth is a rigid non-woven fabric, and the core-pore membrane has an adhesive layer on the side away from the rigid non-woven fabric. A perforated area corresponding to the air vents on the food preservation packaging is provided in the center of the adhesive layer. The food preservation label provided by this utility model uses the rigid non-woven fabric to provide the strength and rigidity required for the core-pore membrane, effectively preventing poor air conduction caused by membrane wrinkles, facilitating production and processing, and helping to control production costs. It can better protect the core-pore membrane and effectively prevent damage from external forces. The perforated area, larger than the air vents, provides greater convenience for users and offers better tolerance during application. When attached to the air vents of the food preservation packaging, the food preservation label can regulate the respiration of fruits and vegetables, reduce their physiological metabolism, and inhibit microbial growth, thereby extending the lifespan of fruits and vegetables.

Description

Technical Field

[0001] This utility model relates to the field of food packaging technology, and in particular to a food preservation sticker, a food preservation bag, and a food preservation box. Background Technology

[0002] How to better preserve fruits and vegetables during storage and transportation has always been a key concern in the industry. After harvesting, fruits and vegetables continue to respire and undergo physiological metabolism. Commonly used preservation bags are made of PE material, which has very poor air permeability. If completely sealed, this leads to insufficient oxygen, forcing the fruits and vegetables to undergo anaerobic respiration, producing alcohol and unpleasant odors, and causing rapid cell death. Carbon dioxide accumulation, especially high concentrations, inhibits normal metabolism and accelerates tissue browning. Ethylene retention prevents the release of ethylene from the fruits and vegetables, accelerating the ripening and decay of both the produce and surrounding plants. Current methods involve perforating the preservation bags to allow for proper respiration and expel some harmful gases, but this still doesn't solve the problem of humidity imbalance. Water vapor produced by respiration condenses inside the bag, and the perforations also provide entry points for external bacteria. Combined with the high humidity environment, this accelerates mold growth, leading to the spoilage of the fruits and vegetables.

[0003] To address the problem of fruit and vegetable preservation, current research suggests applying nucleoporous membranes (NPMs) to the fruit and vegetable industry. Utilizing the permeability and microbial barrier properties of NPMs, these membranes are installed on the ventilation holes of preservation packaging products to achieve moisture removal, air permeability, and contamination resistance. However, NPMs themselves lack sufficient strength and rigidity; wrinkles can affect the perforation function and they are easily damaged. To ensure the open state of the NPM, additional functional layers are generally required to ensure its proper functioning. For example, Chinese Patent No. 202420290496X, a utility model patent entitled "A Preservation Sticker and Preservation Packaging," proposes adding a polyester air duct fabric to the NPM to provide external barrier properties, while simultaneously adding a support layer and an adhesive layer to support the structure and adhere it to the preservation packaging. The nucleopore membrane and air duct cloth are located in the perforated area corresponding to the ventilation holes in the food preservation packaging. Polyester material has poor abrasion resistance and is easily damaged, failing to provide effective protection for the nucleopore membrane. To ensure breathability, the polyester air duct cloth must be a thin film. Due to the insufficient rigidity of polyester film, a support layer and adhesive layer must be added to improve structural rigidity, which increases production difficulty and cost. To control costs, the area of ​​the nucleopore membrane used must be strictly controlled. Food preservation labels are primarily used for manual application, and even with proper labeling, misalignment can still occur, significantly diminishing the effectiveness of the nucleopore membrane. Therefore, we urgently need a food preservation label that can ensure the strength and rigidity of the nucleopore membrane while better controlling costs and ensuring its proper functioning. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a food preservation sticker, food preservation bag, and food preservation box.

[0005] To achieve the above objectives, a food preservation label includes an airway fabric and a core pore membrane with overlapping upper and lower areas. The airway fabric is a rigid non-woven fabric, and the core pore membrane has an adhesive layer on the side away from the rigid non-woven fabric. The adhesive layer has a perforated area in the middle that corresponds to the air vents on the food preservation packaging.

[0006] Rigid nonwoven fabric is selected as the airway fabric and attached to the nuclear pore membrane. The rigid nonwoven fabric serves as a structural support to prevent wrinkles and deformation of the nuclear pore membrane. The good air permeability of the nonwoven fabric ensures the normal operation of the nuclear pore membrane pores. Moreover, the nonwoven fabric has good abrasion resistance and is not easily damaged, which can better protect the nuclear pore membrane. The adhesive layer allows the nuclear pore membrane to be directly attached to the preservation packaging, making it convenient to use.

[0007] Preferably, the area of ​​the hollowed-out area is larger than the area of ​​the vent holes and completely covers the vent holes.

[0008] The area of ​​the perforated area should be larger than the area of ​​the ventilation holes to facilitate the application of the food preservation stickers to the food preservation packaging.

[0009] Preferably, the adhesive layer completely encloses the hollow area to form a closed structure.

[0010] The adhesive layer must fit closely to the food preservation packaging. Completely enclosing the perforated area can prevent external microorganisms from entering the ventilation holes through the gaps in the adhesive layer, thus ensuring the effectiveness of the food preservation sticker.

[0011] Preferably, the bending stiffness of the rigid nonwoven fabric is 50-500 mN·m.

[0012] Preferably, the abrasion resistance of the rigid nonwoven fabric is greater than 10mg / 1000 cycles.

[0013] Preferably, the nuclear pore membrane is circular, rectangular, polygonal, or other irregular shapes.

[0014] Preferably, the pore size of the nuclear pore membrane is 300 nm-14 µm, and the thickness of the nuclear pore membrane is 8 µm-50 µm.

[0015] Preferably, the material of the nuclear pore membrane includes polycarbonate, polyester, polyimide, polyethylene, polypropylene, polytetrafluoroethylene, or polyethersulfone.

[0016] A food storage bag, wherein the food storage bag has a vent hole, and a food storage sticker as described in any of the preceding claims is adhered to the position corresponding to the vent hole, the food storage sticker completely covering the vent hole.

[0017] A food storage box is provided with ventilation holes, and a food preservation sticker as described in any of the above claims is adhered to the corresponding position of the ventilation holes, the food preservation sticker completely covering the ventilation holes.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] The food preservation patch provided by this utility model provides the strength and hardness required for the nuclear pore membrane through a rigid non-woven fabric. The stable support of the rigid non-woven fabric effectively prevents poor air conduction caused by wrinkles in the nuclear pore membrane, facilitates production and processing, and helps control production costs. The high abrasion resistance of the rigid non-woven fabric can better protect the nuclear pore membrane and effectively prevent damage from external forces. At the same time, the air permeability of the rigid non-woven fabric does not affect the air permeability of the nuclear pore membrane. The hollow area design with an area larger than the air pores provides convenience for users to use the food preservation patch and provides a better tolerance for error when applying the food preservation patch.

[0020] The preservation sticker provided by this utility model is attached to the ventilation holes of preservation packaging. Through a nucleoporous membrane, it effectively regulates the respiration of fruits and vegetables inside the packaging. The excellent permeability of the nucleoporous membrane effectively removes gases such as acetylene and carbon dioxide, as well as moisture, from the packaging. Furthermore, it prevents external microorganisms from entering the packaging, providing a favorable environment for the storage of fruits and vegetables. This achieves the effects of regulating the respiration of fruits and vegetables, reducing their physiological metabolism, and inhibiting microbial growth, thereby extending the lifespan of fruits and vegetables. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the embodiments will be briefly introduced below.

[0022] Figure 1 This is a bottom view of the food preservation patch according to embodiments 1-3 of this utility model.

[0023] Figure 2 This is a cross-sectional view of the food preservation patch in Embodiments 1-3 of this utility model.

[0024] Figure 3 This is a schematic diagram of the structure of the food storage box with a food preservation sticker attached, according to Embodiment 4 of this utility model.

[0025] Figure 4 This is a schematic diagram of a food storage bag with a food preservation sticker attached, which is an embodiment of the present invention, Comparative Example 1. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0027] Example 1

[0028] like Figures 1-2 As shown, a food preservation patch 100 is provided, comprising an airway fabric 101 and a nucleopore membrane 102 with overlapping upper and lower areas. The airway fabric 101 is a rigid non-woven fabric with a bending stiffness of 50 mN·m. Through the support of the rigid non-woven fabric, the food preservation patch is not prone to wrinkling or deformation and exhibits good unfolding properties after application. The rigid non-woven fabric has an abrasion resistance of 10 mg / 1000 cycles, ensuring that the food preservation packaging is not easily worn during storage and transportation, effectively preventing damage or deformation of the nucleopore membrane from external forces. The nucleopore membrane 102 is circular in shape, with a pore size of 300 nm and a thickness of 8 µm. Gas and moisture can effectively pass through the nucleopore membrane 102, and the nucleopore membrane 102 has excellent blocking properties against microorganisms and liquid water.

[0029] The nucleopore membrane 102 has an adhesive layer 103 on the side away from the rigid non-woven fabric. The adhesive layer 103 uses double-sided adhesive to tightly bond the nucleopore membrane 102 to the preservation packaging, making it convenient to use. The adhesive layer 103 has a perforated area 104 in the middle, corresponding to the vents on the preservation packaging. Oxygen and carbon dioxide inside the preservation packaging enter and exit through the vents, and are then regulated by the nucleopore membrane 102. This effectively controls the oxygen and carbon dioxide concentrations inside the preservation packaging, reducing the respiration of fruits and vegetables. Oxygen regulation prevents fruits and vegetables from being forced into anaerobic respiration, which produces alcohol and off-odors, and causes rapid cell death. Carbon dioxide regulation prevents high concentrations of carbon dioxide from inhibiting normal metabolism in fruits and vegetables and accelerating tissue browning.

[0030] The accumulation of ethylene released by the physiological metabolism of fruits and vegetables accelerates the ripening and decay of the fruits and vegetables themselves and surrounding fruits and vegetables. The permeability coefficient of the nuclear pore membrane 102 to ethylene reaches 2.1×10⁻ 6 Its capacity of cm³·cm / (cm²·s·Pa) is five times that of LDPE film. This property allows for the rapid removal of ethylene released by fruits and vegetables, slows down the decomposition rate of chlorophyll, and inhibits the activity of polyphenol oxidase, thereby slowing down the ripening and decay of fruits and vegetables.

[0031] Water vapor produced by the respiration of fruits and vegetables condenses when it encounters cold air inside the preservation packaging, forming condensate. The high humidity environment will accelerate the growth of mold and cause the fruits and vegetables to rot. The nucleopore membrane has a high permeability to water vapor, and the nucleopore membrane 102 can effectively remove water vapor from the preservation packaging and prevent condensation.

[0032] The area of ​​the perforated area 104 is larger than the area of ​​the vent holes and completely covers them. This eliminates the need for precise positioning when using the food preservation label 100. The extra area of ​​the perforated area 104 provides room for error, making it more convenient and efficient to use. Furthermore, the adhesive layer 103 completely surrounds the perforated area 104, forming a closed structure, preventing microorganisms from entering the food preservation packaging through the gaps in the adhesive layer 103 after the food preservation label 100 is applied. The core-pore membrane 102 effectively blocks external microorganisms from entering the food preservation packaging, reducing the amount of microorganisms inside and controlling their reproduction rate.

[0033] The nuclear pore membrane 102 is made of materials including polycarbonate, polyester, polyimide, polyethylene, polypropylene, polytetrafluoroethylene, or polyethersulfone. The airway fabric 101 and the nuclear pore membrane 102 can be fixed together in various ways to form an integrated structure. For example, the edge areas of the airway fabric 101 and the nuclear pore membrane 102 can be glued together, or the airway fabric 101 with a similar melting point can be heat-pressed together with the nuclear pore membrane 102. The pressing structure must not damage the pores of the nuclear pore membrane 102.

[0034] Example 2

[0035] like Figures 1-2 As shown, this embodiment provides a food preservation patch with a structure similar to that of Embodiment 1. The difference is that the rigid nonwoven fabric has a bending stiffness of 300 mN·m. Through the support of the rigid nonwoven fabric, the food preservation patch is less prone to wrinkling and deformation, and exhibits good unfolding properties after application. The rigid nonwoven fabric has an abrasion resistance of 30 mg / 1000 cycles, ensuring that the food preservation packaging is not easily worn during storage and transportation, effectively preventing damage or deformation of the nucleopore membrane from external forces. The nucleopore membrane 102 is circular in shape, with a pore size of 2 µm and a thickness of 25 µm. Gas and moisture can effectively pass through the nucleopore membrane 102, and the nucleopore membrane 102 has excellent blocking properties against microorganisms and liquid water.

[0036] Example 3

[0037] like Figures 1-2As shown, this embodiment provides a food preservation patch with a structure similar to that of Embodiment 1. The difference is that the rigid nonwoven fabric has a bending stiffness of 500 mN·m. Through the support of the rigid nonwoven fabric, the food preservation patch is less prone to wrinkling and deformation, and exhibits good unfolding properties after application. The rigid nonwoven fabric has an abrasion resistance of 90 mg / 1000 cycles, ensuring that the food preservation packaging is not easily worn during storage and transportation, effectively preventing damage or deformation of the nucleopore membrane from external forces. The nucleopore membrane 102 is circular in shape, with a pore size of 14 µm and a thickness of 50 µm. Gas and moisture can effectively pass through the nucleopore membrane 102, and the nucleopore membrane 102 has excellent blocking properties against microorganisms and liquid water.

[0038] Example 4

[0039] like Figure 3 As shown, a food storage box 200 is provided. A ventilation hole 10 is provided on one side of the food storage box 200. A food preservation sticker 100 is attached to the food storage box 200, completely covering the ventilation hole 10. The food preservation sticker 100 is attached to the inside of the food storage box 200, with the nucleopore membrane 102 side of the food preservation sticker 100 facing outwards and the rigid non-woven fabric side facing inwards. Alternatively, the food preservation sticker 100 can also be attached to the outside of the food storage box 200, with the nucleopore membrane 102 side of the food preservation sticker 100 facing inwards and the rigid non-woven fabric side facing outwards. A reinforcing structure 11 is provided inside the vent 10. The reinforcing structure 11 consists of multiple reinforcing ribs 12 that converge toward the center of the vent 10 to form a radial support structure, supporting the food preservation label 100. This reinforcing structure is suitable for food preservation boxes 200 with larger vent 10s, and can protect the food preservation label 100. It should be noted that the reinforcing structure 11 can also use other structural methods to support the food preservation label 100, and is not limited to a radial support structure. As another implementation, for vent 10s with smaller vent 10s that do not require additional structural support for the food preservation label 100, a through-hole vent 10 can also be used.

[0040] Example 5

[0041] like Figure 4 As shown, attach the cling film to... Figure 4 As shown in figure a, the outer surface of the food storage bag 300, after being attached, is as follows: Figure 4 As shown in b, the preservation patch 100 completely covers the ventilation hole 10. Freshly harvested coriander is placed in the preservation bag 300, the preservation bag 300 is sealed, and it is placed at room temperature for three days. Then the bag is opened to observe the changes in the appearance and smell of the coriander: the color of the coriander leaves remains unchanged and there is no alcohol smell.

[0042] Comparative Example 1

[0043] Freshly harvested cilantro was placed in a plastic bag 300 with ventilation holes 10, the bag 300 was sealed, and left at room temperature for three days. Then the bag was opened to observe the changes in the appearance and smell of the cilantro: the cilantro leaves rotted and turned black, and had a distinct alcohol smell.

[0044] Comparative Example 2

[0045] Freshly harvested cilantro was left open at room temperature for three days. After that, the cilantro was opened and its appearance and smell were observed to change: the cilantro leaves were dry and yellow, and there was no alcohol smell.

[0046] It should be noted that the coriander in Example 5, Comparative Example 1, and Comparative Example 2 were placed at the same time, in the same location, under the same humidity conditions, and in a location free from wind. A comparison of Example 5, Comparative Example 1, and Comparative Example 2 revealed that open-placed coriander, undergoing normal respiration, quickly dries out and turns yellow due to the lack of water supply and external microorganisms after harvesting. Coriander placed in a sealed bag, despite retaining some moisture, quickly rots and turns black due to the entry of external microorganisms and the high humidity inside the bag. Coriander placed in a bag with a sealing sticker, however, benefits from the excellent breathability of the sticker, which regulates oxygen and carbon dioxide levels and releases ethylene gas and water vapor, effectively slowing down respiration and metabolism. The sticker also prevents the entry of external microorganisms, resulting in sufficient moisture, slow metabolism, and no signs of rotting, thus successfully achieving preservation.

[0047] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A food preservation sticker, characterized in that, The product includes an airway fabric and a core pore membrane with overlapping upper and lower areas. The airway fabric is a rigid nonwoven fabric. The core pore membrane has an adhesive layer on the side away from the rigid nonwoven fabric. The adhesive layer has a perforated area in the middle that corresponds to the air vent on the preservation packaging. The area of ​​the perforated area is larger than the area of ​​the air vent and completely covers the air vent. The adhesive layer completely surrounds the perforated area to form a closed structure. The rigid nonwoven fabric has a bending stiffness of 50-500 mN·m and an abrasion resistance greater than 10 mg / 1000 cycles.

2. The food preservation patch according to claim 1, characterized in that, The nuclear pore membrane is circular or polygonal in shape.

3. A food preservation patch according to claim 1, characterized in that, The pore size of the nuclear pore membrane is 300nm-14µm, and the thickness of the nuclear pore membrane is 8µm-50µm.

4. A food storage bag, characterized in that, The food preservation bag has ventilation holes, and a food preservation sticker according to any one of claims 1-3 is adhered to the position corresponding to the ventilation holes, and the food preservation sticker completely covers the ventilation holes.

5. A food storage box, characterized in that, The food storage box has ventilation holes, and a food preservation sticker according to any one of claims 1-3 is adhered to the corresponding position of the ventilation holes, and the food preservation sticker completely covers the ventilation holes.

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