Moisture-proof packaging film

Abstract

The utility model discloses a moisture-proof packaging film, which belongs to the field of films, and is characterized in that drying beads are arranged in a food packaging film and are positioned in the air through air holes in a fitting layer, and if the air contains moisture, the moisture can be absorbed by the drying beads when being in contact with the drying beads, so that the effect of eliminating the moisture in the air is realized; after the product is made into a packaging film, the interior of the bag body is always dried by the drying beads through the air holes, so that food in the bag body cannot be humidified.

Description

Technical Field

[0001] This utility model discloses a moisture-proof packaging film, belonging to the field of films. Background Technology

[0002] Packaging film is a thin film used to make packaging bags.

[0003] In order to prevent food from becoming damp, existing packaging films often include desiccants inside food packaging bags when food is placed inside. However, some young children lack the ability to identify desiccants, and desiccants themselves have strong water absorption properties. If accidentally ingested, they can easily cause danger.

[0004] A new solution is proposed to supplement packaging films. Utility Model Content

[0005] The purpose of this invention is to provide a moisture-proof packaging film to solve the above-mentioned problems.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a moisture-proof packaging film, comprising:

[0007] The base layer, which has waterproof and air-tight functions, is used as the surface of this product;

[0008] A positioning layer is laminated on top of the base layer, and positioning recesses are evenly distributed on the positioning layer;

[0009] Drying beads are placed on the positioning recesses, and the drying beads are used to absorb moisture in the air;

[0010] A plant layer is composited on top of the positioning layer, and the plant layer is used to adhere and fix the drying beads.

[0011] An adhesive layer is laminated on top of the plant layer, and the adhesive layer has several air pores formed on it, which is used to expose the drying beads to the air.

[0012] Preferably, the drying beads have a series connection hole in the middle, and several drying beads are connected in series by moisture-wicking yarn.

[0013] Preferably, the plant layer is formed by co-extrusion of hot melt adhesive mixed with hygroscopic color-changing powder.

[0014] Preferably, the hot melt adhesive in the plant layer contains a foaming agent that can create voids inside the plant layer.

[0015] Preferably, the hygroscopic color-changing powder includes iron powder.

[0016] Preferably, a sealing layer is provided between the bonding layer and the plant layer to separate the plant layer from the outside world, and the sealing layer has a vent hole at the drying bead that connects to the air vent.

[0017] Preferably, the bonding layer, plant layer and sealing layer are all made of transparent material.

[0018] Compared with the prior art, the beneficial effects of this utility model are: by setting desiccant beads inside the food packaging film and allowing the desiccant beads to be in the air through the vents on the adhesive layer, if there is moisture in the air, the moisture will be absorbed by the desiccant beads when they come into contact with the air, thereby achieving the effect of eliminating moisture in the air. This ensures that when this product is made into a packaging film, the inside of the bag is always dried by the desiccant beads, thus preventing the food inside the bag from becoming damp. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the packaging bag made according to this utility model.

[0021] Attached diagram labels: 1. Base layer; 2. Moisture-absorbing color-changing powder; 3. Positioning layer; 4. Plant layer; 5. Sealing layer; 6. Adhesive layer; 7. Ventilation holes; 8. Drying beads; 9. Moisture-wicking yarn. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," 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 the present utility model and simplifying the description. They 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 the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0023] like Figure 1As shown, a moisture-proof packaging film includes: a base layer 1, a positioning layer 3 laminated on the base layer 1, desiccant beads 8 placed on positioning recesses, a plant layer 4 laminated on the positioning layer 3, and an adhesive layer 6 laminated on the plant layer 4. The base layer has waterproof and airtight functions. Positioning recesses are evenly distributed on the positioning layer 3. The desiccant beads 8 are used to absorb moisture in the air. The plant layer 4 is used to adhere and fix the desiccant beads 8. Several air vents 7 are formed on the adhesive layer 6, which is used to expose the desiccant beads 8 to the air.

[0024] The principle of this product is to place the drying beads 8 inside the packaging film, and then expose the drying beads 8 to the air through the vent holes 7, so that the drying beads 8 can dry the air around the packaging film through the vent holes 7.

[0025] When using this product, if... Figure 2 As shown, first, two layers of packaging film are bonded together, then the edges are folded so that the base layer 1 at the edge faces inwards. Then, the sealing machine seals three sides of the two layers of film, forming a packaging bag with an opening. At this point, the material is placed inside the packaging bag, and then the opening is folded towards the inside of the packaging bag. Finally, the opening is sealed by the sealing machine, so that the entire packaging bag is wrapped by the base layer 1. At this point, the vent 7 located facing inwards from the inside of the bag connects the desiccant 8 with the internal environment of the bag, allowing the moisture inside the bag to be absorbed by the desiccant 8. This ensures that even without a desiccant, the internal environment of the bag remains in a low-humidity or even dry state. Furthermore, since the entire inner wall of the bag has vent 7, the drying area is increased, further reducing the possibility of moisture presence and making the inside of the bag even drier.

[0026] A series connection hole is provided in the middle of the drying beads 8. Several drying beads 8 are connected in series by moisture-wicking yarn 9. The moisture-wicking yarn 9 is used to connect the drying beads 8 in series to avoid local saturation of the drying beads 8, which would cause local areas to not dry in time and cause the food to become damp.

[0027] The plant layer 4 is formed by co-extrusion of hot melt adhesive mixed with moisture-absorbing and color-changing powder 2. The hot melt adhesive is used to fix the desiccant beads 8 placed in the positioning recesses, preventing the desiccant beads 8 from moving during the lamination process and causing the air vents 7 to not be properly aligned with the desiccant beads 8. After the moisture-absorbing and color-changing powder 2 is saturated with moisture and precipitates out from the desiccant beads 8, it is absorbed by the iron powder when conducted through the moisture-wicking yarn 9, thus turning the iron powder into rust. Since the iron powder is black and the rust is reddish-brown, the color change of the bag can indicate whether the food inside the bag may have become damp.

[0028] The hot melt adhesive inside the plant layer 4 contains a foaming agent that creates voids within the plant layer 4. By mixing the foaming agent into the hot melt adhesive, dense voids are formed inside the hot melt adhesive after curing. These voids allow air to pass through the plant layer 4, enabling the iron powder inside the plant layer 4 to more easily absorb water and oxygen from the air, thus forming rust. This further ensures that the items inside the bag are not affected by moisture.

[0029] A sealing layer 5 is provided between the bonding layer 6 and the plant layer 4 to separate the plant layer 4 from the outside world. The sealing layer 5 has a vent hole at the drying bead 8 that connects to the vent hole 7. The sealing layer 5 covers the surface of the plant layer 4 to form a sealed surface, so that water molecules can only enter the plant layer 4 after the drying bead is saturated and precipitated. This prevents the plant layer 4 from coming into contact with the outside world under normal conditions, allowing the hygroscopic color-changing powder 2 to better indicate whether it is wet or not.

[0030] The bonding layer 6, the plant layer 4, and the sealing layer 5 are all made of transparent material, which allows users to better observe the environment inside the bag.

[0031] This product can reseal food that hasn't been completely consumed after opening. However, food is prone to mold growth in oxygen- and moisture-rich environments, and early mold growth is often invisible to the naked eye. Consuming moldy food at this stage can easily cause food poisoning. This product uses an indicator inside the packaging: when the inside of the bag changes from black to red, it indirectly indicates that the food has been in a humid environment for an extended period. This color change serves as a warning to consumers not to eat the food. Furthermore, bacteria produce water vapor and carbon dioxide during respiration, forming CO2 + H2O → H2CO3. When this reacts with iron powder, it produces ferrous carbonate (Fe + H2CO3) → FeCO3 + H2. Ferrous carbonate is white, so observing the color inside the bag also indicates whether prolonged respiration has occurred. Additionally, the bag itself has a black inner wall under normal conditions, which also provides light protection.

[0032] This product uses the color of the inner wall of the bag to inversely predict the environment of the food inside. Black represents a normal environment, red a humid environment, and white an environment where bacteria grow and carbon dioxide is produced. By changing the color, it warns consumers of the product's condition, allowing them to proactively avoid potential hazards. The desiccant in Desiccant 8 is a fine-pore silica gel desiccant.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A moisture-proof packaging film, characterized in that, include: The base layer, which has waterproof and air-tight functions, is used as the surface of this product; A positioning layer is laminated on top of the base layer, and positioning recesses are evenly distributed on the positioning layer; Drying beads are placed on the positioning recesses, and the drying beads are used to absorb moisture in the air; A plant layer is composited on top of the positioning layer, and the plant layer is used to adhere and fix the drying beads. An adhesive layer is laminated on top of the plant layer, and the adhesive layer has several air pores formed on it, which is used to expose the drying beads to the air.

2. The moisture-proof packaging film according to claim 1, characterized in that: The drying beads have a series connection hole in the middle, and several drying beads are connected in series by moisture-wicking yarn.

3. The moisture-proof packaging film according to claim 2, characterized in that: The plant layer is formed by co-extrusion of hot melt adhesive mixed with hygroscopic color-changing powder.

4. The moisture-proof packaging film according to claim 3, characterized in that: The hot melt adhesive within the plant layer contains a foaming agent that creates voids within the plant layer.

5. A moisture-proof packaging film according to claim 4, characterized in that: The hygroscopic color-changing powder includes iron powder.

6. The moisture-proof packaging film according to claim 4, characterized in that: A sealing layer is provided between the bonding layer and the plant layer to separate the plant layer from the outside world. The sealing layer has a vent hole at the drying bead that connects to the air vent.

7. A moisture-proof packaging film according to claim 6, characterized in that: The bonding layer, plant layer, and sealing layer are all made of transparent material.

Images