Two-layer waterproof adhesive film

Abstract

The utility model relates to a two-layer waterproof adhesive film which comprises waterproof fabric layers, waterproof fabric strips are arranged on the outer surface of the sewing position of the two overlapped waterproof fabric layers, TPU waterproof adhesive film layers are arranged on the waterproof fabric strips and the sewing position, and each TPU waterproof adhesive film layer is composed of a fiber net layer and a two-component hot melt adhesive layer. The fiber net layer is of a net structure formed by weaving natural fibers. The waterproof fabric can be used for waterproof clothes, outdoor tents and the like, has a long-lasting and effective waterproof effect and is not easy to fall off. The natural fibers are woven to form the net structure, so that the waterproof fabric strips can be adhered more stably, the waterproof fabric strips are stably adhered to the sewing positions without being influenced when the product is stressed and pulled, the TPU waterproof adhesive film layer is not easily influenced by the outside under the covering action of the waterproof fabric strips, and the durability of the waterproof effect is ensured.

Description

Technical Field

[0001] This utility model relates to the field of outdoor waterproof materials technology, specifically to a two-layer waterproof membrane. Background Technology

[0002] With global participation in outdoor sports growing at an average annual rate of 8%-12% (data source: Outdoor Industry Association), waterproof clothing (such as waterproof jackets, raincoats, hiking boots, etc.) has become a core category of outdoor gear. However, while traditional waterproof fabrics (such as PU coatings and PVC film composite fabrics) possess excellent static waterproof performance, they still face the following core pain point in actual wear: waterproof failure due to seam holes. In garment manufacturing, multiple pieces are joined by sewing (such as straight seams, overlock seams, etc.), and the diameter of the sewing needle holes can reach 0.5-1mm, far exceeding the diameter of raindrops (about 0.1mm), causing rainwater to seep in through the needle holes. Existing waterproofing methods mostly involve using a "hot air machine to attach a strip" along the fabric's webbing after sewing. However, the disadvantage of this method is that as the webbing is stretched, the waterproof strip at the seam of the fabric webbing will gradually peel off and leak, failing to ensure the entire garment is waterproof for long time, resulting in poor waterproof performance. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a two-layer waterproof film to solve the problem that the waterproof strips at the splicing and overlapping of cut pieces will gradually peel off and leak water.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A two-layer waterproof membrane includes a waterproof fabric layer and a waterproof fabric strip on the outer surface of the seam where the two overlapping waterproof fabric layers meet. A TPU waterproof membrane layer is then applied between the waterproof fabric strip and the seam. The TPU waterproof membrane layer consists of a fiber mesh layer and a two-component hot-melt adhesive layer. The fiber mesh layer is a mesh structure woven from natural fibers. This membrane can be used in waterproof clothing, outdoor equipment, tents, etc., providing long-lasting and effective waterproofing without easily peeling off. The mesh structure formed by the natural fibers ensures a more secure adhesion of the waterproof fabric strip, preventing it from being affected when the product is stretched. Furthermore, the TPU waterproof membrane layer, covered by the waterproof fabric strip, is less susceptible to external influences, guaranteeing the durability of the waterproof effect.

[0006] Preferably, the TPU waterproof adhesive film layer is a hybrid layer formed by heating a fiber mesh layer and a two-component hot melt adhesive layer at high temperature. During the application process, the fiber mesh layer and the two-component hot melt adhesive layer form a hybrid layer through high-temperature heating. During the heating process, the two-component hot melt adhesive layer melts, disperses, and penetrates into the fiber mesh layer, making the TPU waterproof adhesive film layer not only adhesive but also thin and tough. This ensures that when the product is subjected to tensile stress, the waterproof fabric strip remains firmly attached to the seams without being affected.

[0007] More preferably, the natural fiber includes at least one of cotton fiber, hemp fiber, or bamboo fiber, and the weaving density of the fiber web is 200-400 threads / inch. The material used is a natural material that is easily degradable.

[0008] More preferably, the two-component hot melt adhesive layer is a TPU / PA blend film. Under high temperature and pressure, it fuses with the fiber mesh layer to form an irreversible waterproof barrier.

[0009] Beneficial Effects: This utility model provides a two-layer waterproof adhesive film, solving the problem of waterproof strips gradually peeling off and leaking when splicing or overlapping seams of cut pieces. It can be used in waterproof clothing, outdoor products, tents, etc., providing long-lasting and effective waterproofing without easily peeling off. The natural fiber weave forms a mesh structure, making the waterproof fabric strip adhere more firmly. Even when the product is subjected to tension, the waterproof fabric strip remains firmly attached to the seam without being affected. The TPU waterproof adhesive film layer, covered by the waterproof fabric strip, is less susceptible to external influences, ensuring the durability of the waterproof effect. During application, the fiber mesh layer and the two-component hot melt adhesive layer form a mixed layer through high-temperature heating. The two-component hot melt adhesive layer melts, disperses, and penetrates into the fiber mesh layer during heating, making the TPU waterproof adhesive film layer not only adhesive but also thinner and more resilient, ensuring the waterproof fabric strip remains firmly attached to the seam without being affected when the product is subjected to tension. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of a two-layer waterproof membrane according to the present invention;

[0012] Explanation of reference numerals in the attached diagram: 1. Waterproof fabric layer; 2. Sewing area; 3. Waterproof fabric strip; 4. TPU waterproof adhesive film layer; 41. Fiber mesh layer; 42. Two-component hot melt adhesive layer. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, any equivalent structural or procedural transformations made using the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

[0014] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and 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, and therefore should not be construed as a limitation of this utility model.

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0016] like Figure 1 The invention discloses a two-layer waterproof membrane, comprising a waterproof fabric layer 1, with a waterproof fabric strip 3 disposed on the outer surface of the seam 2 of the two overlapping waterproof fabric layers 1. A TPU waterproof membrane layer 4 is disposed between the waterproof fabric strip 3 and the seam 2. The TPU waterproof membrane layer 4 is composed of a fiber mesh layer 41 and a two-component hot melt adhesive layer 42. The fiber mesh layer 41 is woven from natural fibers to form a mesh structure. This invention can be used in waterproof clothing, outdoor tents, etc., providing long-lasting and effective waterproofing without easily peeling off. The mesh structure formed by the natural fiber weave ensures a more secure adhesion of the waterproof fabric strip 3, preventing it from being affected when the product is subjected to tension. Furthermore, the TPU waterproof membrane layer 4, covered by the waterproof fabric strip, is less susceptible to external influences, ensuring the durability of the waterproof effect.

[0017] The TPU waterproof adhesive film layer 4 is a mixed layer formed by heating a fiber mesh layer 41 and a two-component hot melt adhesive layer 42 at high temperature. During the application process, the fiber mesh layer 41 and the two-component hot melt adhesive layer 42 are heated at high temperature to form a mixed layer. During the heating process, the two-component hot melt adhesive layer 42 melts, disperses, and penetrates into the fiber mesh layer 41, making the TPU waterproof adhesive film layer 4 not only have an adhesive function, but also become thinner and more resilient, so that when the product is subjected to force and pulling, the waterproof fabric strip 3 is firmly adhered to the seam without being affected.

[0018] The natural fiber includes at least one of cotton, hemp, or bamboo fiber, and the weaving density of the fiber web is 200-400 threads / inch. The materials used are natural and easily degradable. The two-component hot melt adhesive layer 42 is a TPU / PA blend film that co-melts and penetrates into the fiber web layer 41 under high temperature and pressure, forming an irreversible waterproof barrier.

[0019] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A two-layer waterproof membrane, comprising a waterproof fabric layer, characterized in that: A waterproof fabric strip is provided on the outer surface of the seam between the two overlapping waterproof fabric layers. A TPU waterproof adhesive film layer is provided between the waterproof fabric strip and the seam. The TPU waterproof adhesive film layer is composed of a fiber mesh layer and a two-component hot melt adhesive layer. The fiber mesh layer is woven from natural fibers to form a mesh structure.

2. The two-layer waterproof membrane as described in claim 1, characterized in that, The TPU waterproof adhesive film layer is a mixed layer formed by heating a fiber mesh layer and a two-component hot melt adhesive layer at high temperature.

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