Woven bag with moisture-proof inner film structure

Abstract

The utility model relates to the field of woven bag, especially a woven bag with moistureproof inner film structure, including woven cloth, the woven cloth is provided with polypropylene layer, polyethylene layer, tensile layer, moistureproof layer in proper order, the inside of woven cloth is provided with moistureproof cloth, the top of woven cloth is provided with the drawstring, the utility model discloses when using, through'multilayer inner film structure + independent moistureproof cloth' forms double moistureproof protection, compared with traditional single layer moistureproof film, can solve the moisture penetration problem from the root. Among them, multilayer inner film (polypropylene layer, polyethylene layer, tensile layer, moistureproof layer) synergistic effect, polypropylene layer maintains structure form, polyethylene layer fills up the flaw and enhances the leakproofness, moistureproof layer (aluminum plastic composite film) dense barrier moisture, the moistureproof cloth in the inside of woven cloth, even if the single layer inner film appears tiny breakage, the moistureproof cloth still can block the moisture invasion, substantially reduces the risk of overall moistureproof failure due to local breakage.

Description

Technical Field

[0001] This utility model relates to the field of woven bag technology, and in particular to a woven bag with a moisture-proof inner membrane structure. Background Technology

[0002] Woven bags are widely used in the packaging and storage of various solid materials such as grains, chemical raw materials, building materials, and fertilizers due to their advantages of low cost, light weight, high tensile strength, and ease of folding for transportation. In these applications, the storage stability of materials is often sensitive to environmental humidity. For example, grains are prone to mold when damp, chemical raw materials may clump or become ineffective if they absorb moisture, and building powders may have their performance affected by moisture. Therefore, the moisture-proof performance of woven bags has become one of the key indicators determining packaging quality.

[0003] Existing woven bags have only a single-layer film as the inner moisture-proof layer. If the film is slightly damaged during processing, transportation or filling, moisture will seep directly into the bag from the damaged area, causing the overall moisture-proof function to fail. Moreover, the barrier performance of a single-layer film is limited and cannot cope with the problem of slow moisture penetration in high humidity environments. Therefore, a woven bag with a moisture-proof inner film structure is proposed. Utility Model Content

[0004] The purpose of this invention is to solve the problems that moisture can directly seep into the bag through the damaged area, causing the overall moisture-proof function to fail, and that the barrier performance of a single-layer film is limited and cannot cope with the problem of slow moisture penetration in high humidity environments. Therefore, this invention proposes a woven bag with a moisture-proof inner film structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A woven bag with a moisture-proof inner membrane structure includes a woven fabric, in which a polypropylene layer, a polyethylene layer, a tensile layer, and a moisture-proof layer are sequentially disposed. A moisture-proof cloth is disposed inside the woven fabric, and a drawstring is disposed at the top of the woven fabric.

[0007] Preferably, the woven fabric has a receiving cavity, and the polypropylene layer, polyethylene layer, tensile layer, and moisture-proof layer are all located inside the receiving cavity.

[0008] Preferably, the polyethylene layer is located on one side of the polypropylene layer, the tensile layer is located on one side of the polyethylene layer, and the moisture-proof layer is located on one side of the tensile layer.

[0009] Preferably, a strip of fabric is sewn onto the inner side of the woven fabric, and the top of the moisture-proof fabric is adhered to the strip of fabric.

[0010] Preferably, a cover is fixedly connected to the top of the woven fabric, and the drawstring is located inside the cover.

[0011] Preferably, a housing is fixedly connected to one side of the woven fabric, and the housing has a rectangular groove in which a label card is placed.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This woven bag utilizes a multi-layer inner membrane structure combined with an independent moisture-proof cloth to provide dual moisture protection. Compared to traditional single-layer moisture-proof films, it addresses the root cause of moisture penetration. The multi-layer inner membrane (polypropylene layer, polyethylene layer, tensile layer, and moisture-proof layer) works synergistically. The polypropylene layer maintains the structural shape, the polyethylene layer fills in imperfections and enhances sealing, and the dense moisture-proof layer (aluminum-plastic composite film) effectively blocks moisture. Combined with the moisture-proof cloth inside the woven fabric, even minor damage to the single-layer inner membrane can prevent moisture intrusion, significantly reducing the risk of overall moisture-proof failure due to localized damage. This makes it particularly suitable for the long-term storage of moisture-sensitive materials such as grains, chemical raw materials, and building powders.

[0014] 2. The top of the woven bag is fitted with a cloth cover and an elastic drawstring. Simply pull the drawstring to quickly tighten the bag opening. This not only prevents materials from falling out, but also further blocks external moisture from entering through the bag opening. The operation is simple and efficient.

[0015] 3. Label cards can be placed on one side of the woven bag shell, allowing the internal materials to be identified through the label without opening the bag, which facilitates warehouse management and quick sorting, and improves material turnover efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a woven bag with a moisture-proof inner membrane structure proposed in this utility model;

[0017] Figure 2 This is a cross-sectional three-dimensional structural diagram of a woven bag with a moisture-proof inner membrane structure proposed in this utility model;

[0018] Figure 3 for Figure 2 A schematic diagram of the three-dimensional structure at point A in the middle.

[0019] In the diagram: 1. Woven fabric; 2. Polypropylene layer; 3. Polyethylene layer; 4. Tensile layer; 5. Moisture-proof layer; 6. Moisture-proof cloth; 7. Drawstring; 8. Receiving cavity; 9. Fabric strip; 10. Fabric cover; 11. Shell; 12. Label card. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Reference Figures 1-3 A woven bag with a moisture-proof inner membrane structure includes a woven fabric 1, and a polypropylene layer 2, a polyethylene layer 3, a tensile layer 4, and a moisture-proof layer 5 are sequentially disposed inside the woven fabric 1. The polyethylene layer 3 is located on one side of the polypropylene layer 2, the tensile layer 4 is located on one side of the polyethylene layer 3, and the moisture-proof layer 5 is located on one side of the tensile layer 4.

[0022] The polypropylene layer 2 is made of modified polypropylene into a film or sheet. By adding anti-aging agents, impact modifiers or slip agents, the weather resistance, puncture resistance and surface smoothness of the material are improved, and it is prevented from sticking to the material. The polypropylene material has a certain rigidity, which can help maintain the shape of the inner layer structure and prevent the material from accumulating unevenly due to the collapse of the inner layer after the bag is filled.

[0023] The polyethylene layer 3 is made of low-density polyethylene or linear low-density polyethylene as raw material to form a flexible film. Polyethylene has excellent flexibility and sealing properties, which can fill the small defects on the surface of the polypropylene layer 2. At the same time, it serves as a "transition layer" to connect the rigid polypropylene layer 2 with the subsequent tensile layer 4, reducing interlayer separation caused by differences in material hardness.

[0024] The tensile layer 4 is made of polyethylene and nylon composite fiber mesh or high-strength PE film, serving as the inner "stress support layer". It can disperse the tensile force generated in the bag during filling, handling and stacking, and prevent the inner layer from being stretched and broken due to excessive stress.

[0025] Moisture barrier layer 5: High barrier material is selected, commonly aluminum-plastic composite film, as the "ultimate moisture barrier" of the inner layer. The dense molecular structure of aluminum-plastic film can effectively block moisture and water in the outside air from penetrating into the inner layer, thus preventing moisture from contacting the material at the source and preventing the material from becoming moldy, clumping or deteriorating.

[0026] The top of the woven fabric 1 is equipped with a drawstring 7. The drawstring 7 is elastic. By pulling the drawstring 7, the opening of the woven fabric 1 is tightened to prevent the goods from falling out of the woven fabric 1, making it more convenient to operate.

[0027] The woven fabric 1 has a moisture-proof fabric 6 inside. The inner moisture-proof layer 5 is mostly a single-layer polyethylene film, which is connected to the inner wall of the outer woven layer by hot pressing or bonding. The barrier properties of the plastic film are used to prevent external moisture from entering.

[0028] The woven fabric 1 has a receiving cavity 8. The polypropylene layer 2, polyethylene layer 3, tensile layer 4, and moisture-proof layer 5 are all located in the receiving cavity 8. The polypropylene layer 2, polyethylene layer 3, tensile layer 4, and moisture-proof layer 5 are tightly attached together with small gaps between them.

[0029] A strip of fabric 9 is sewn onto the inside of the woven fabric 1. The top of the moisture-proof fabric 6 is attached to the strip of fabric 9. The strip of fabric 9 makes it easy to fix the moisture-proof fabric 6 inside the woven fabric 1.

[0030] A cover 10 is fixedly connected to the top of the woven fabric 1, and a drawstring 7 is located inside the cover 10. The cover 10 allows the drawstring 7 to tighten the opening of the woven fabric 1.

[0031] A housing 11 is fixedly connected to one side of the woven fabric 1. The housing 11 has a rectangular groove, in which a label card 12 is placed. According to the items inside the woven fabric 1, the corresponding label card 12 can be placed into the rectangular groove on the housing 11, so that the items inside the woven fabric 1 can be identified without opening the woven fabric 1.

[0032] The working principle of this utility model:

[0033] Polypropylene layer 2, polyethylene layer 3, tensile layer 4, and moisture-proof layer 5 are sequentially and tightly bonded to the cavity 8 to form a complete inner protective structure; at the same time, the independent moisture-proof cloth 6 is fixed inside the woven fabric 1 by the cloth strip 9 sewn on the inside of the woven fabric 1, so that the moisture-proof cloth 6 and the multiple inner films together cover the inner space of the woven fabric 1, providing an all-round moisture barrier for the material.

[0034] When woven fabric 1 is used to store materials, external moisture first comes into contact with the outer woven fabric 1, which itself has a certain degree of impermeability. If moisture breaks through woven fabric 1, the first layer of barrier is provided by multiple inner membranes—polypropylene layer 2 maintains the inner layer shape with its rigidity, preventing structural collapse that could lead to moisture gaps; polyethylene layer 3 fills the surface defects of polypropylene layer 2 and enhances the sealing performance; tensile layer 4 prevents the inner membrane from being damaged by the weight of the material or external force; and finally, the moisture-proof layer 5, an aluminum-plastic composite film, blocks moisture from entering the inner layer through its dense molecular structure. At the same time, an independent moisture-proof cloth 6 serves as a secondary protection. Even if the multiple inner membranes are partially damaged, moisture will be intercepted by the moisture-proof cloth 6 and cannot come into contact with the materials inside the bag, ensuring that the materials are always in a dry environment.

[0035] After the material is filled, pull the elastic drawstring 7 inside the top cover 10 of the woven fabric 1. As the drawstring 7 tightens, it causes the cover 10 to contract, thereby tightly closing the opening of the woven bag. This prevents the material from falling out of the bag and also blocks moisture from entering. In addition, select the corresponding label card 12 according to the type of material inside the bag and place the label card 12 into the rectangular groove of the shell 11 on one side of the woven fabric 1. During subsequent storage or sorting, staff can directly identify the material through the label card 12 without opening the bag for inspection, thus improving management efficiency.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A woven bag with a moisture-proof inner membrane structure, comprising woven fabric (1), characterized in that, The woven fabric (1) is provided with a polypropylene layer (2), a polyethylene layer (3), a tensile layer (4), and a moisture-proof layer (5) in sequence. The woven fabric (1) is provided with a moisture-proof cloth (6) inside. The top of the woven fabric (1) is provided with a drawstring (7).

2. The woven bag with a moisture-proof inner membrane structure according to claim 1, characterized in that, The woven fabric (1) has a receiving cavity (8), and the polypropylene layer (2), polyethylene layer (3), tensile layer (4), and moisture-proof layer (5) are all located in the receiving cavity (8).

3. A woven bag with a moisture-proof inner membrane structure according to claim 2, characterized in that, The polyethylene layer (3) is located on one side of the polypropylene layer (2), the tensile layer (4) is located on one side of the polyethylene layer (3), and the moisture-proof layer (5) is located on one side of the tensile layer (4).

4. A woven bag with a moisture-proof inner membrane structure according to claim 3, characterized in that, The inner side of the woven fabric (1) is sewn with a strip of fabric (9), and the top of the moisture-proof fabric (6) is attached to the strip of fabric (9).

5. A woven bag with a moisture-proof inner membrane structure according to claim 4, characterized in that, The top of the woven fabric (1) is fixedly connected to a cloth cover (10), and the drawstring (7) is located inside the cloth cover (10).

6. A woven bag with a moisture-proof inner membrane structure according to claim 5, characterized in that, A housing (11) is fixedly connected to one side of the woven fabric (1). The housing (11) has a rectangular groove, and a label card (12) is placed in the rectangular groove.

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