PTFE membrane composite fabric

Abstract

This utility model discloses a PTFE membrane composite fabric, relating to the field of composite fabric technology. The key technical points are: it includes a base fabric and a PTFE film. The base fabric includes a fixing area and a breathable area. The PTFE film is bonded and fixed to the fixing area of ​​the base fabric by several fixing strips. The cross-sectional shape of the fixing strips is wavy. These fixing strips are arranged in a spaced array along the warp and weft directions of the base fabric. The cross-sectional shape of the breathable area is also wavy, with the wavy crests near the PTFE film abutting against the PTFE film. This utility model uses fixing strips to bond and fix the PTFE film, reducing the area of ​​adhesive coating and resulting in a more breathable composite fabric.

Description

Technical Field

[0001] This utility model relates to the field of composite fabric technology, and more specifically, to PTFE membrane composite fabric. Background Technology

[0002] Membrane composite fabrics are multi-layered materials that combine functional films (such as TPU, PTFE, PE, etc.) with textile fabrics through adhesives or hot pressing processes. They have properties such as waterproofing, breathability, windproofing, and abrasion resistance, and are widely used in outdoor clothing, medical protective equipment, automotive interiors, and other fields.

[0003] Application number CN202021460494.9 discloses a waterproof and highly breathable PTFE / PU composite fabric. Its key technical features are: by combining a base fabric layer, a PTFE waterproof layer and a PU breathable layer, and by setting micro-nano porous particles in the PU breathable layer, the fabric can achieve effective waterproof and breathable properties. Moreover, by setting a binding strip, the structure of the fabric on both sides is guaranteed to be stable and not easily delaminated.

[0004] The aforementioned application documents utilize the waterproof properties of PTFE membranes to create waterproof fabrics, achieving a waterproof effect. However, the PTFE membrane completely covers the fabric. Although the surface of the PTFE membrane has many micropores and the fabric also has weaving pores, the adhesive used when laminating the PTFE membrane onto the fabric will block the micropores on the PTFE membrane and the pores on the fabric, resulting in poor breathability of the laminated fabric and affecting wearing comfort.

[0005] Therefore, a new solution is needed to address this problem. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide PTFE membrane composite fabric.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: The PTFE membrane composite fabric includes a base fabric and a PTFE film. The base fabric includes a fixed area and a breathable area. The PTFE film is fixed to the fixed area of ​​the base fabric by a plurality of fixing strips. The cross-sectional shape of the fixing strips is wavy. The plurality of fixing strips are spaced apart along the warp and weft directions of the base fabric. The cross-sectional shape of the breathable area is wavy. The crest of the breathable area near the PTFE film abuts against the PTFE film.

[0008] The present invention is further configured such that adjacent fixing strips are symmetrically arranged.

[0009] The present invention is further configured such that: the warp yarns of the fixed area and the breathable area are different, but the weft yarns are the same; the warp yarn diameter of the fixed area is larger than that of the breathable area; the weft yarns of the fixed area and the breathable area include a number of coarse weft yarns and a number of fine weft yarns; and the fixing strip is disposed on the coarse weft yarn of the fixed area.

[0010] The present invention is further configured such that: the warp yarns in the fixed area are polyester-viscose yarns, the warp yarns in the breathable area are polyester-cotton yarns, and the warp yarn arrangement density in the fixed area is greater than that in the breathable area.

[0011] The present invention is further configured such that the fixed area and the area where the weft yarn is fine weft yarn are provided with a number of ventilation holes.

[0012] The present invention is further configured such that: the coarse weft yarn is a polyester profiled yarn, and the fine weft yarn is a polyester-cotton yarn.

[0013] In summary, this utility model has the following beneficial effects: the wavy fixed adhesive strips are spaced apart and the pleats in the breathable area ensure that the PTFE film is firmly bonded while preserving the microporous breathable channels to the maximum extent, allowing air to flow freely and accelerating sweat evaporation. The fixed area uses high-density weaving and thickened yarns to enhance support, while the breathable area improves breathability by optimizing the yarn combination and pore structure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure in this invention with the PTFE film removed;

[0016] Figure 3 This is a weaving diagram of the bottom fabric in this utility model.

[0017] In the diagram: 1. Base fabric; 2. PTFE film; 3. Fixing area; 4. Breathable area; 5. Fixing strip; 6. Coarse weft yarn; 7. Fine weft yarn. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] This PTFE membrane composite fabric, such as Figures 1-2As shown, the fabric includes a base fabric 1 and a PTFE film 2. The PTFE film 2 is fixed to the base fabric 1 by adhesive. The microporous structure of the PTFE film 2 allows water vapor to pass through but blocks liquid water, providing high water pressure resistance. At the same time, the microporous structure on the surface of the PTFE film 2 gives it good air permeability. The base fabric 1 includes a fixing area 3 and a breathable area 4. The PTFE film 2 is fixed to the fixing area 3 of the base fabric 1 by several fixing strips 5. The cross-sectional shape of the fixing strips 5 is wavy. The adhesive used to fix the PTFE film 2 is applied in strip form. This reduces the area of ​​adhesive application while fixing the PTFE film 2, thereby reducing the sealing of the micropores on the PTFE film 2 and the gaps in the fabric by the adhesive, ensuring the breathability of the fabric after lamination. Furthermore, the wavy shape of the fixing strips 5 allows for a larger area to be radiated for the same application area, which can better fix the PTFE film 2 and the base fabric 1.

[0020] like Figures 1-2 As shown, several fixing strips 5 are spaced apart along the warp and weft directions of the base fabric 1, with adjacent fixing strips 5 arranged symmetrically. The spaced arrangement of the fixing strips 5 is also to fix the PTFE film 2 with as little coating area as possible. The uniform spacing also facilitates better coverage of the entire fabric by the flowing air. The flowing air accelerates the evaporation of sweat on the fabric, making the fabric more comfortable to wear. The fixing strips 5 are only set on the fixing area 3. The fixing area 3 has higher overall strength and higher weave density, which can better support the fixing strips 5 and prevent them from seeping out of the base fabric 1, thus providing a better support and fixation effect for the PTFE film 2.

[0021] like Figures 1-3 As shown, the warp yarns of the fixed area 3 and the breathable area 4 are different, but the weft yarns are the same. The warp yarn diameter of the fixed area 3 is larger than that of the breathable area 4. The weft yarns of the fixed area 3 and the breathable area 4 include several coarse weft yarns 6 and several fine weft yarns 7. The fixing strip 5 is set on the coarse weft yarns 6 of the fixed area 3. The base fabric 1 formed by weaving according to this pattern has the greatest thickness and the best stability in the part of the base fabric 1 where the warp yarns of the fixed area 3 interweave with the coarse weft yarns 6. Therefore, the fixing strip 5 is more firmly fixed in this area. The fixing strip 5 is coated by a coating roller. Therefore, a wavy fixing strip 5 can be formed by setting a predetermined shape on the coating roller. This method of forming a patterned coating is a conventional method. The pattern in this application is also a basic wavy shape. The specific production process will not be described in detail.

[0022] like Figures 1-3As shown, the part where the warp and weft yarns 7 interweave in the breathable zone 4 is the thinnest part of the base fabric 1, allowing air to pass through the base fabric 1 more quickly for exchange. This area has the best breathability on the base fabric 1. The cross-sectional shape of the breathable zone 4 is wavy, with the crest of the wavy zone 4 near the PTFE film 2 abutting against the PTFE film 2. There is a height difference in thickness between the area where the adhesive strip 5 is applied and the area where the breathable zone 4 is applied. The adhesive strip 5 can fix the PTFE film 2 to the base fabric 1. However, the placement of the adhesive strip 5 is limited, and the support strength will also decrease. Therefore, the breathable zone 4 is bent to... The height after bending is equal to the sum of the height of the base fabric 1 and the fixing strip 5. The breathable area 4 does not need to be coated with adhesive to fix the PTFE film 2, but it can provide support and enhance the stability of the entire composite fabric. Before the film is laminated, the breathable area 4 is pleated and sewn in place by a sewing machine to facilitate the subsequent lamination operation. The pleated breathable area 4 also reduces the contact area with the body surface. After sweating, the entire base fabric 1 does not stick to the body surface. Air flows in the troughs on both sides of the breathable area 4, and the base fabric 1 and the sweat on the body surface evaporate with the air flow.

[0023] like Figures 1-3 As shown, the warp yarns in the fixed area 3 are set as polyester-viscose yarns, and the warp yarns in the breathable area 4 are set as polyester-cotton yarns. The warp yarn arrangement density in the fixed area 3 is greater than that in the breathable area 4. The coarse weft yarn 6 is set as polyester profiled yarn. The cross-sectional shape of the polyester profiled fiber formed by twisting is cross-shaped. The fine weft yarn 7 is set as polyester-cotton yarn. Several air holes are provided in the areas of the fixed area 3 and the breathable area 4 where the weft yarn is fine weft yarn 7. The air holes are the weaving gaps formed during the weaving process of the base fabric 1. Different sizes of gaps can be formed by controlling the spacing between adjacent yarns when threading the reed and beating the weft. This method of forming air holes is more convenient and eliminates the step of punching holes later, which improves the production efficiency of the fabric. At the same time, the air holes improve the breathability of the fabric.

[0024] like Figures 1-3 As shown, the polyester-viscose yarn is a blend of polyester and viscose fibers, which has high strength and good moisture absorption. The polyester-cotton yarn is a blend of polyester and cotton fibers, which improves the breathability of the polyester yarn by using cotton fibers. When weaving the base fabric 1, a number of polyester-viscose yarns and a number of polyester-cotton yarns are threaded onto the reed and fixed on the loom. A number of coarse weft yarns 6 and a number of fine weft yarns 7 are weft-knitted onto the warp to form the base fabric 1. The breathable area 4 is first sewn and fixed into a wavy shape using a sewing machine. The base fabric 1 is first coated with glue on the composite equipment. The glue roller with the pre-set pattern is coated with a wavy fixing glue strip 5 on the base fabric 1. Finally, the PTFE film 2 is laminated and fixed on the bottom.

[0025] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A PTFE membrane composite fabric, characterized in that: The device includes a base fabric (1) and a PTFE film (2). The base fabric (1) includes a fixed area (3) and a breathable area (4). The PTFE film (2) is fixed to the fixed area (3) of the base fabric (1) by several fixing strips (5). The cross-sectional shape of the fixing strips (5) is wavy. Several fixing strips (5) are arranged at intervals along the warp and weft directions of the base fabric (1). The cross-sectional shape of the breathable area (4) is wavy. The peak of the breathable area (4) near the PTFE film (2) abuts against the PTFE film (2).

2. The PTFE membrane composite fabric according to claim 1, characterized in that: The adjacent fixing strips (5) are arranged symmetrically.

3. The PTFE membrane composite fabric according to claim 1, characterized in that: The warp yarns of the fixed area (3) and the breathable area (4) are different, but the weft yarns are the same. The warp yarn diameter of the fixed area (3) is larger than that of the breathable area (4). The weft yarns of the fixed area (3) and the breathable area (4) include several coarse weft yarns (6) and several fine weft yarns (7). The fixing strip (5) is set on the coarse weft yarns (6) of the fixed area (3).

4. The PTFE membrane composite fabric according to claim 3, characterized in that: The warp yarns of the fixed area (3) are made of polyester-viscose yarn, and the warp yarns of the breathable area (4) are made of polyester-cotton yarn. The warp yarn arrangement density of the fixed area (3) is greater than that of the breathable area (4).

5. The PTFE membrane composite fabric according to claim 4, characterized in that: The fixed area (3) and the breathable area (4) are provided with several breathable holes in the areas where the weft yarn is fine weft yarn (7).

6. The PTFE membrane composite fabric according to claim 3, characterized in that: The coarse weft yarn (6) is a polyester profiled yarn, and the fine weft yarn (7) is a polyester-cotton yarn.

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