Fresh-keeping sticker

Abstract

The invention discloses a fresh-keeping sticker which comprises air passage cloth and a nuclear track film which are overlapped in upper and lower areas, the air passage cloth is hard non-woven fabric, an adhesive layer is arranged on one side, far away from the hard non-woven fabric, of the nuclear track film, and a hollow area corresponding to an air hole in a fresh-keeping package is arranged in the middle of the adhesive layer. According to the fresh-keeping patch, the hard non-woven fabric is used for providing strength and hardness requirements for the nuclear track film, poor pore air guide caused by wrinkling of the nuclear track film is effectively prevented, production and processing are facilitated, and the production cost is favorably controlled; the nuclear track membrane can be better protected, and external force damage is effectively prevented; the design of the hollowed-out area with the area larger than that of the air holes provides convenience for people to use the fresh-keeping paste, and a better error-tolerant rate is provided when the fresh-keeping paste is attached. The fresh-keeping paste provided by the invention is attached to the air hole of the fresh-keeping package, can adjust the respiration of fruits and vegetables, reduce the physiological metabolism of the fruits and vegetables and inhibit the breeding of microorganisms, and has the effect of prolonging the life cycle of the fruits and vegetables.

Description

Technical Field

[0001] The present invention relates to the technical field of food packaging, in particular to a fresh-keeping sticker. Background Art

[0002] How to better preserve fruits and vegetables during storage and transportation has always been a key concern within the industry. After harvest, fruits and vegetables continue to respire and undergo physiological metabolism. Fresh-keeping bags are typically made of PE, which has very low air permeability. If completely sealed, this leads to a lack of oxygen, forcing the fruits and vegetables to undergo anaerobic respiration, producing alcohol and odor, and causing rapid cell necrosis. Carbon dioxide accumulates, and high concentrations of carbon dioxide inhibit the normal metabolism of fruits and vegetables, accelerating tissue browning. Ethylene retention prevents the ethylene released by fruits and vegetables from being expelled, accelerating the ripening and decay of the fruits and vegetables themselves and surrounding fruits and vegetables. Existing methods involve punching air holes in fresh-keeping bags to provide proper respiration for the fruits and vegetables and expel some unpleasant gases, but this still cannot solve the problem of humidity imbalance. The water vapor produced by the fruits and vegetables' respiration liquefies when cooled inside the bag, forming condensed water. The air holes also provide a channel for external bacteria to enter. Furthermore, the high humidity environment accelerates mold growth, causing the fruits and vegetables to rot.

[0003] In order to solve the problem of preserving fruits and vegetables, the existing research direction mentions the application of nuclear pore membranes to the field of fruits and vegetables. By taking advantage of the air permeability and microbial barrier properties of the nuclear pore membranes, the nuclear pore membranes are installed on the air holes of fresh-keeping packaging products to achieve the purpose of moisture removal, ventilation, and anti-pollution. However, the strength and hardness of the nuclear pore membrane itself are insufficient. Wrinkles will affect the perforation effect and are also easily damaged. In order to ensure the open state of the nuclear pore membrane, other functional layers are generally required to ensure that the nuclear pore membrane can work normally. For example, the Chinese patent number 202420290496X is a utility model patent for a fresh-keeping sticker and fresh-keeping packaging. It proposes to add a polyester airway cloth to the nuclear pore membrane to provide an external barrier for the nuclear pore membrane, and at the same time add a support layer and an adhesive layer to support the structure and bond it to the fresh-keeping packaging. The nuclear pore membrane and airway cloth are located in the hollowed-out areas corresponding to the air holes in the fresh-keeping packaging. Polyester has poor wear resistance and is easily damaged, which cannot provide any practical protection for the nuclear pore membrane. To ensure breathability, the polyester airway cloth can only be used in the form of a thin film. Due to the insufficient hardness of the polyester film, a support layer and an adhesive layer have to be added to increase the hardness of the structure, which invisibly increases the difficulty and cost of production. To control costs, the use area of the nuclear pore membrane must be strictly controlled. The use scenario of the fresh-keeping sticker is basically manual application. Even if the fresh-keeping sticker is well marked, it may still be applied unevenly, which greatly reduces the effectiveness of the nuclear pore membrane. Therefore, there is an urgent need for a fresh-keeping sticker that can ensure the strength and hardness of the nuclear pore membrane structure, better control costs, and ensure the normal operation of the nuclear pore membrane. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to provide a fresh-keeping sticker.

[0005] In order to achieve the above-mentioned purpose, a fresh-keeping patch includes an airway cloth and a nuclear pore membrane with overlapping upper and lower areas. The airway cloth is a hard non-woven fabric, and the nuclear pore membrane is provided with an adhesive layer on the side away from the hard non-woven fabric. The middle part of the adhesive layer is provided with a hollow area corresponding to the air permeability hole on the fresh-keeping packaging.

[0006] Rigid non-woven fabric is selected as the airway cloth and attached to the nuclear pore membrane. The rigid non-woven fabric is used as a structural support to avoid wrinkling and deformation of the nuclear pore membrane. The good air permeability of the non-woven fabric can ensure the normal operation of the gaps in the nuclear pore membrane. In addition, the non-woven fabric has good wear resistance and is not easy to be damaged, which can better protect the nuclear pore membrane. The adhesive layer can directly attach the nuclear pore membrane to the fresh-keeping packaging, which is convenient to use.

[0007] Preferably, the area of the hollow region is larger than the area of the vent holes and completely covers the vent holes.

[0008] The area of the hollow area should be larger than the area of the ventilation hole to facilitate personnel to operate the fresh-keeping sticker to be attached to the fresh-keeping package.

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

[0010] The adhesive layer must be closely fitted to the fresh-keeping packaging, and completely enclosing the hollow area can prevent external microorganisms from entering the air holes through the gaps in the adhesive layer, thereby ensuring the effectiveness of the fresh-keeping sticker.

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

[0012] Preferably, the wear resistance of the rigid non-woven fabric is greater than 10 mg / 1000 times.

[0013] Preferably, the shape of 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 nucleopore membrane includes polycarbonate, polyester, polyimide, polyethylene, polypropylene, polytetrafluoroethylene or polyethersulfone.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The fresh-keeping patch provided by the present invention provides the strength and hardness requirements for the nuclear pore membrane through the hard non-woven fabric. The stable supporting effect of the hard non-woven fabric effectively prevents the nuclear pore membrane from wrinkling and causing poor pore air conduction, which is convenient for production and processing and helps to control production costs; the high wear resistance of the hard non-woven fabric can better protect the nuclear pore membrane and effectively prevent damage by external forces; and the air permeability of the hard 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 pore provides convenience for people to use the fresh-keeping patch and provides better fault tolerance when attaching the fresh-keeping patch.

[0018] The fresh-keeping sticker provided by the present invention is attached to the air holes of fresh-keeping packaging. The nuclear pore membrane effectively regulates the respiration of fruits and vegetables inside the fresh-keeping packaging. The excellent air permeability of the nuclear pore membrane can effectively discharge gases such as acetylene and carbon dioxide, as well as moisture, from the fresh-keeping packaging. It can also prevent external microorganisms from entering the fresh-keeping packaging, providing a good storage environment for fruits and vegetables. This can regulate the respiration of fruits and vegetables, reduce their physiological metabolism, inhibit the growth of microorganisms, and thus extend the life cycle of fruits and vegetables. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below.

[0020] Figure 1 This is a bottom view of the fresh-keeping sticker of Examples 1-3 of the present invention.

[0021] Figure 2 sectional views of fresh-keeping stickers according to embodiments 1-3 of the present invention.

[0022] Figure 3 This is a structural schematic diagram of a fresh-keeping box with a fresh-keeping sticker attached according to embodiment 4 of the present invention.

[0023] Figure 4 Schematic diagram of fresh-keeping bags with fresh-keeping stickers attached according to Example 4 of the present invention and Comparative Example 1.

[0024] Figure 5 The figure is a comparison chart of the experimental results of Example 4, Comparative Example 1 and Comparative Example 2 of the present invention. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0026] Example 1

[0027] like Figure 1-Figure 2As shown, a fresh-keeping patch 100 is provided, comprising an airway fabric 101 and a nuclear pore membrane 102 with overlapping upper and lower surfaces. The airway fabric 101 is a rigid non-woven fabric with a bending stiffness of 50 mN·m / m. The support provided by the rigid non-woven fabric prevents the fresh-keeping patch from wrinkling or deformation, and provides excellent unfolding after application. The rigid non-woven fabric has an abrasion resistance of 10 mg / 1000 times, making it less susceptible to wear and tear during storage and transportation of the fresh-keeping packaging, effectively protecting the nuclear pore membrane from damage or deformation caused by external forces. The nuclear pore membrane 102 is circular, has a pore diameter of 300 nm, and is 8 μm thick. Gas and moisture can effectively pass through the nuclear pore membrane 102, and the nuclear pore membrane 102 provides excellent barrier properties against microorganisms and liquid water.

[0028] The nuclear pore membrane 102 is provided with an adhesive layer 103 on the side away from the rigid non-woven fabric. The adhesive layer 103 is made of double-sided tape, which allows the nuclear pore membrane 102 to be tightly attached to the fresh-keeping packaging, making it easy to use. The adhesive layer 103 is provided with a hollow area 104 in the middle, corresponding to the air holes on the fresh-keeping packaging. Oxygen and carbon dioxide in the fresh-keeping packaging enter and exit through the air holes, and are then regulated by the nuclear pore membrane 102. This can effectively control the oxygen and carbon dioxide concentrations in the fresh-keeping packaging and reduce the respiration of fruits and vegetables. The oxygen regulation prevents fruits and vegetables from being forced to undergo anaerobic respiration, which produces alcohol and odor, and causes rapid cell necrosis. The carbon dioxide regulation prevents high carbon dioxide concentrations from inhibiting the normal metabolism of fruits and vegetables and accelerating tissue browning.

[0029] The accumulation of ethylene released by the physiological metabolism of fruits and vegetables will accelerate the ripening and decay of the fruits and vegetables themselves and the surrounding fruits and vegetables. The permeability coefficient of the nuclear pore membrane 102 to ethylene is 2.1×10 -6 cm 3 cm / (cm 2 ·s·Pa), which is 5 times that of LDPE film. This characteristic can quickly discharge the ethylene released by fruits and vegetables, slow down the decomposition rate of chlorophyll, inhibit the activity of polyphenol oxidase, and thus slow down the ripening and decay of fruits and vegetables.

[0030] The water vapor generated by the respiration of fruits and vegetables will liquefy when cooled in the fresh-keeping packaging, forming condensed water. A high humidity environment will accelerate the growth of mold and cause the fruits and vegetables to rot. The nuclear pore membrane has a high permeability to water vapor. The nuclear pore membrane 102 can effectively discharge the water vapor in the fresh-keeping packaging to avoid the generation of condensed water.

[0031] The hollow area 104 is larger than the vents and completely covers them, eliminating the need for precise positioning when applying the fresh-keeping sticker 100. The extra area provided by the hollow area 104 provides margin for error, making it easier to use and more efficient. Furthermore, the adhesive layer 103 completely encloses the hollow area 104, forming a closed structure. Once the fresh-keeping sticker 100 is applied, microorganisms cannot enter the fresh-keeping package through the gaps in the adhesive layer 103. The microbial barrier effect of the nucleus pore membrane 102 effectively prevents external microorganisms from entering the fresh-keeping package, reducing the microbial population within the package and controlling its growth rate.

[0032] The nucleus pore membrane 102 may be made of polycarbonate, polyester, polyimide, polyethylene, polypropylene, polytetrafluoroethylene, or polyethersulfone. The airway cloth 101 and the nucleus pore membrane 102 may be fixed to form an integrated structure using various methods, such as gluing the edges of the airway cloth 101 and the nucleus pore membrane 102, or heat-pressing the airway cloth 101 and the nucleus pore membrane 102 using materials with similar melting points. The press-fitting process must not damage the pores of the nucleus pore membrane 102.

[0033] Example 2

[0034] like Figure 1-Figure 2 As shown, this embodiment provides a fresh-keeping patch with a structure similar to that of Example 1. However, the rigid non-woven fabric has a bending stiffness of 300 mN·m / m. This supports the patch, making it less prone to wrinkling and deformation, and allows for excellent unfolding after application. The rigid non-woven fabric also has an abrasion resistance of 30 mg / 1000 times, effectively protecting it from wear and tear during storage and transportation, effectively protecting the nuclear pore membrane from damage or deformation caused by external forces. The nuclear pore membrane 102 is circular, has a pore size of 2 μm, and is 25 μm thick. Gas and moisture can effectively pass through the membrane, and the membrane effectively blocks microorganisms and liquid water.

[0035] Example 3

[0036] like Figure 1-Figure 2As shown, this embodiment provides a fresh-keeping patch with a structure similar to that of Example 1. However, the rigid non-woven fabric has a bending stiffness of 500 mN·m / m. This supports the patch, making it less prone to wrinkling and deformation, and allows for excellent unfolding after application. The rigid non-woven fabric also has an abrasion resistance of 90 mg / 1000 times, making it less susceptible to wear and tear during storage and transportation of the fresh-keeping packaging. This effectively protects the nuclear pore membrane from damage or deformation caused by external forces. The nuclear pore membrane 102 is circular, has a pore diameter of 14 μm, and is 50 μm thick. Gas and moisture can effectively pass through the membrane, and the membrane effectively blocks microorganisms and liquid water.

[0037] Example 4

[0038] like Figure 3 As shown, a fresh-keeping box 200 is provided. A ventilation hole 10 is provided on one side of the fresh-keeping box 200. A fresh-keeping sticker 100 is attached to the fresh-keeping box 200. The fresh-keeping sticker 100 completely covers the ventilation hole 10. The fresh-keeping sticker 100 is attached to the interior of the fresh-keeping box 200, with the nuclear pore membrane 102 side of the fresh-keeping sticker 100 facing outward and the rigid non-woven fabric side facing inward. As another implementation, the fresh-keeping sticker 100 can also be attached to the exterior of the fresh-keeping box 200, with the nuclear pore membrane 102 side of the fresh-keeping sticker 100 facing inward and the rigid non-woven fabric side facing outward. A reinforcement structure 11 is provided within the vent 10. This reinforcement structure 11 comprises multiple reinforcing ribs 12 that intersect toward the center of the vent 10 to form a radial support structure, supporting the fresh-keeping patch 100. This reinforcement structure is suitable for fresh-keeping boxes 200 with larger vents 10, as it can protect the fresh-keeping patch 100. It should be noted that the reinforcement structure 11 can also support the fresh-keeping patch 100 using other structural methods and is not limited to radial support structures. As another implementation, if the vent 10 is smaller and does not require additional structural support for the fresh-keeping patch 100, a through-hole vent 10 can also be used.

[0039] Example 5

[0040] like Figure 4 As shown, attach the fresh-keeping sticker to Figure 4 The outer surface of the fresh-keeping bag 300 shown in a is attached as follows Figure 4 As shown in b, the fresh-keeping sticker 100 completely covers the vent hole 10, and the freshly harvested coriander is placed in the fresh-keeping bag 300. The fresh-keeping bag 300 is sealed and placed at room temperature for three days. Then the bag is opened to observe the changes in the appearance and smell of the coriander. Figure 5 As shown in a, the coriander leaves remain unchanged in color and have no alcohol smell.

[0041] Comparative Example 1

[0042] Place the freshly harvested coriander in a fresh-keeping bag 300 with air holes 10, seal the fresh-keeping bag 300, place it at room temperature for three days, and then open the bag to observe the changes in the appearance and smell of the coriander. Figure 5 As shown in b, the coriander leaves are rotten and black, with a distinct smell of alcohol.

[0043] Comparative Example 2

[0044] Place freshly harvested coriander in an open bag at room temperature for three days, then open the bag and observe the changes in the appearance and smell of the coriander. Figure 5 As shown in c, the coriander leaves are dry and yellow, and have no alcohol smell.

[0045] 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 windless environment. By comparing Example 5, Comparative Example 1, and Comparative Example 2, it was found that the coriander placed in the open air respired normally. Due to the lack of water supply and the action of external microorganisms after harvest, the coriander consumed its own water, and the leaves quickly dried up and turned yellow. The coriander placed in the sealed bag retained a certain amount of water due to the entry of external microorganisms and the high humidity in the fresh-keeping bag. However, the leaves quickly rotted and turned black. The coriander placed in the fresh-keeping bag with the fresh-keeping sticker had excellent air permeability, which could regulate the oxygen and carbon dioxide in the bag, discharge ethylene gas and water vapor, and effectively slow down the respiration and metabolism of the coriander. The fresh-keeping sticker also blocked the entry of external microorganisms. The coriander had sufficient water, slowed metabolism, and showed no signs of rot, successfully achieving the preservation effect.

[0046] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A fresh-keeping sticker, characterized in that: It includes an airway cloth and a nuclear pore membrane with overlapping upper and lower areas. The airway cloth is a hard non-woven fabric. The nuclear pore membrane is provided with an adhesive layer on the side away from the hard non-woven fabric. The middle of the adhesive layer is provided with a hollow area corresponding to the air permeability hole on the fresh-keeping package.

2. A fresh-keeping sticker according to claim 1, characterized in that: The area of the hollow area is larger than the area of the vent hole and completely covers the vent hole.

3. A fresh-keeping sticker according to claim 2, characterized in that: The adhesive layer completely surrounds the hollow area to form a closed structure.

4. The fresh-keeping sticker according to claim 1, characterized in that: The bending rigidity of the rigid non-woven fabric is 50-500 mN·m / m.

5. The fresh-keeping sticker according to claim 1, characterized in that: The hard non-woven fabric has a wear resistance greater than 10 mg / 1000 times.

6. The fresh-keeping sticker according to claim 1, characterized in that: The shape of the nuclear pore membrane is circular, rectangular, polygonal or other irregular shapes.

7. The fresh-keeping sticker according to claim 1, characterized in that: 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.

8. The fresh-keeping sticker according to claim 1, characterized in that: The material of the nuclear pore membrane includes polycarbonate, polyester, polyimide, polyethylene, polypropylene, polytetrafluoroethylene or polyethersulfone.

9. A fresh-keeping bag, characterized in that: The fresh-keeping bag is provided with ventilation holes, and the fresh-keeping sticker according to any one of claims 1 to 8 is adhered to positions corresponding to the ventilation holes, and the fresh-keeping sticker completely covers the ventilation holes.

10. A fresh-keeping box, characterized in that: The fresh-keeping box is provided with ventilation holes, and the fresh-keeping sticker according to any one of claims 1 to 8 is adhered to positions corresponding to the ventilation holes, and the fresh-keeping sticker completely covers the ventilation holes.

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