A composite fabric

Abstract

This utility model discloses a composite fabric, comprising a surface fabric, an intermediate adhesive layer, and a bottom plastic film layer. The surface fabric and the plastic film layer are bonded together by the intermediate adhesive layer. The surface fabric is a woven fabric, and the intermediate adhesive layer consists of uniformly distributed hot melt adhesive dots. The warp direction of the intermediate adhesive layer is consistent with the warp direction of the surface fabric, and the weft direction of the intermediate adhesive layer is consistent with the weft direction of the surface fabric. The hot melt adhesive dots cover the weave points of the surface fabric, with each hot melt adhesive dot covering one or more weave points. The composite fabric of this utility model exhibits excellent, uniform, and stable peel strength.

Description

Technical Field

[0001] This utility model belongs to the field of composite material technology, and specifically relates to a composite fabric. Background Technology

[0002] The peel strength of composite fabrics directly affects the durability and quality of products. Currently, there is considerable research on improving the peel strength of composite fabrics. For example, patent CN 216993432 U, "A High-Strength TPU Film Suitable for High-Strength Lamination of Mesh Fabric," discloses a structure to improve the peel strength between the TPU film and the mesh fabric. This structure achieves a tight bond by layering the recesses of the mesh fabric layer with the raised textures of the TPU film layer. However, because the recesses on the fabric surface are not regular and orderly, achieving an effective fit between the raised textures of the TPU film and the recesses presents certain processing challenges. Furthermore, it does not mention any technical details on how to improve the peel strength.

[0003] The common method of bonding composite fabrics is to connect different layers with hot melt adhesive. Generally, adhesive dots in a uniform array are set between the layers for bonding. However, existing technologies rarely address how to set adhesive dots according to the characteristics of the fabric to improve the peel strength of composite fabrics. Utility Model Content

[0004] This invention provides a composite fabric that aims to give the composite fabric excellent, uniform and stable peel strength, and make the fabric surface flat and even, with a delicate and comfortable feel, thereby enhancing the sense of quality.

[0005] This utility model discloses a composite fabric comprising a surface fabric, an intermediate adhesive layer, and a bottom plastic film layer. The surface fabric and the plastic film layer are bonded together by the intermediate adhesive layer. The surface fabric is a woven fabric, and the intermediate adhesive layer consists of uniformly distributed hot melt adhesive dots. The warp and weft directions of the hot melt adhesive dots in the intermediate adhesive layer are consistent with the warp and weft directions of the surface fabric. The hot melt adhesive dots cover the weft points of the surface fabric, with each hot melt adhesive dot covering one or more weft points. The weft points are the intersections of the warp and weft yarns of the woven fabric.

[0006] This invention distributes hot melt adhesive dots as evenly as possible at the intersection of warp and weft yarns, which can effectively bond the warp and weft yarns of the woven fabric, ensuring uniform and stable peel strength of the composite fabric and a high-quality feel.

[0007] The hot melt adhesive dots of this invention are arranged in a staggered row and column configuration, compared to... Figure 2 The misalignment of rows and columns in the dot matrix and Figure 3As can be seen from the alignment of the rows and columns of the dot matrix, when the distance between the adhesive dots is the same, the distribution of adhesive dots is more uniform and the number of adhesive dots is greater when the dot matrix is ​​staggered in the same area, that is, more tissue points are covered. The staggered arrangement of hot melt adhesive dots can make the peel strength of the composite fabric more uniform and stable.

[0008] In this invention, the number of hot melt adhesive dots per 10mm along the warp or weft of the intermediate adhesive layer is denoted as m, and the number of tissue points covered by each hot melt adhesive dot is denoted as n. Let the dot coverage coefficient W = m + n, then 14 ≤ W ≤ 28.

[0009] Ideally, the glue dots are circular. When calculating the number of glue dots in the warp and weft directions, the starting point is located outside the glue dot, and the ending point is located outside or inside the glue dot. Specifically, if the ending point is inside the glue dot, glue dots with an area less than 1 / 4 of a standard glue dot circle are not counted; glue dots with an area between 1 / 4 and 3 / 4 of a standard glue dot circle are counted as 0.5; and glue dots with an area between 3 / 4 and 1 standard glue dot circle are counted as 1.

[0010] Extensive experiments have demonstrated a strong correlation between the adhesive dot coverage coefficient W and the peel strength of this invention. When the adhesive dot coverage coefficient W is less than 14, the peel strength exhibits a very significant downward trend, which will significantly affect the product's service life. When the adhesive dot coverage coefficient W is greater than 28, due to the large amount of adhesive applied, adhesive aggregation and uneven distribution of adhesive dots are likely to occur, and some adhesive dots may even seep back to the other side of the fabric. This results in severely uneven peel strength and large deviations in the composite fabric, leading to poor consistency in the product's peel strength.

[0011] In a preferred embodiment: the number of warp yarns that continuously cross weft yarns in the woven fabric is defined as the warp float, and the number of weft yarns that continuously cross warp yarns is defined as the weft float. Therefore, the warp float ≤ 2 and the weft float ≤ 2. Experiments have shown that when the float length > 2, the peel strength of the composite fabric decreases significantly. This is because when some adhesive dots adhere to the floats rather than the weave points, the adhesive cannot be effectively distributed to the other yarn system, resulting in ineffective adhesive application or directional peel strength (i.e., a large difference in peel strength between the fabric and the film). This leads to poor adhesion of the adhesive to the fabric, resulting in poor peel strength of the composite fabric.

[0012] Further experiments have shown that when the float length is ≤2, the fabric surface is relatively flat and uniform, and the adhesive dots can be distributed as evenly as possible at the interlacing points of the warp and weft yarns, i.e., the weaving points. This can achieve a good bonding effect on the warp and weft yarns of the woven fabric, ensuring the uniformity and stability of the peel strength of the composite fabric and a strong sense of quality.

[0013] As a more preferred embodiment: 17≤W≤28, in which case the peel strength exhibits superior and stable results. When the warp and weft densities of the intermediate adhesive layer are the same, the adhesive dots can be more evenly distributed in the fabric layer and film layer, resulting in uniform and stable peel strength along the warp and weft directions of the composite fabric.

[0014] Furthermore, multiple experimental studies have found that when 1 ≤ n ≤ 14 and m ≥ 11, the adhesive dots can be distributed more evenly, resulting in a more uniform bonding effect, peel strength, and hand feel in the composite fabric. As the number of tissue points covered by each adhesive dot (n) decreases, the corresponding adhesive dot density increases. When the adhesive dots are small and dense, the bonding strength of the composite fabric is more uniform and stable. When m < 11, the peel strength is lower and uneven. Increasing the number of tissue points covered by each adhesive dot (n) decreases the corresponding adhesive dot density; however, the value of n cannot increase indefinitely. When the number of tissue points covered by each adhesive dot (n) > 14, the adhesive dots may not spread properly, resulting in uneven adhesive distribution and glue seepage, leading to poor fabric uniformity and unstable peel strength.

[0015] More preferably, both the warp and weft yarns are long filament bundles, with the warp yarn having a thickness of 50D to 300D and the weft yarn having a thickness of 50D to 300D. The purpose of using long filament bundles is that they consist of continuous long fibers, while short-fiber yarns or plied yarns are twisted and bound together. Compared to short-fiber yarns, long filament bundles have superior strength and uniformity, and are better able to ensure that adhesive dots are evenly dispersed within the fibers, increasing the fabric's evenness. The yarn used should not exceed 300D; excessively thick yarns will cause unevenness in the fabric surface, large gaps at interlacing points, and thus problems such as adhesive seepage and poor bonding strength. The yarn should not be less than 50D; when the yarn is too fine, the fabric is thin and prone to sheerness, resulting in a shiny fabric surface and an added plastic feel to the composite fabric, leading to a poor overall quality. The closer the thickness of the filament bundles used in the warp and weft directions, the better the uniformity of the adhesive dots and the better the uniformity of the fabric surface.

[0016] Preferably, the warp and weft yarns are made of at least one of polyester, nylon, or regenerated cellulose fiber. Polyester fiber has high strength and good abrasion resistance, resulting in a smooth and high-quality fabric surface. Nylon fiber is easy to print and dye, possesses excellent strength and abrasion resistance, good shape retention, high quality, and excellent durability. Regenerated cellulose fiber provides a natural skin-friendly feel and good breathability, is environmentally friendly and sustainable, has minimal environmental impact, and meets consumers' demand for green consumption. These materials offer a balance between material quality and durability, while also being cost-effective and suitable for mass production.

[0017] In a preferred embodiment of this invention, the plastic film layer contains a low-melting-point material with a melting point or melting temperature in the range of 60–110°C, including m-PE, POE, EVA, EMA, EBA, or low-melting-point LDPE. When hot melt adhesive is applied to the fabric and the plastic film, the applied temperature is 100–110°C. At this temperature, the crystalline regions of the low-melting-point material partially melt, and the amorphous chain segments exhibit significantly enhanced fluidity. This increases the wettability and surface energy of the plastic film surface, making it easier for the adhesive to fully penetrate the micropores or irregular areas of the film surface, thereby increasing interfacial diffusion and interpenetration between the plastic film and the adhesive. After cooling and curing, the interfacial anchoring effect and van der Waals forces are enhanced, significantly improving the bonding strength.

[0018] More preferably, the plastic film layer can be made of multilayer co-extruded film, composite film, or single-component film. Multi-component film materials can fully leverage the complementary advantages of different materials, giving the plastic film superior mechanical strength, barrier properties, and tear resistance, thereby effectively broadening the application range of the final composite fabric.

[0019] The thickness of the plastic film layer in this invention is 0.03mm to 0.08mm. If the plastic film layer is too thin, the composite fabric is prone to damage and holes; if it is too thick, the composite fabric feels too stiff.

[0020] In a preferred embodiment of this invention, the hot melt adhesive of the intermediate adhesive layer is at least one of polyurethane, rubber, or acrylate with a melting point of 60–120°C. When the hot melt adhesive is applied to the fabric and plastic film, at a temperature of approximately 100–110°C, the adhesive can effectively melt and soften, and fully bond the plastic film layer and the fabric layer, enhancing interfacial diffusion and penetration.

[0021] The beneficial effects of this utility model are as follows:

[0022] 1. This utility model distributes hot melt adhesive dots as evenly as possible at the intersection of warp and weft yarns, which can achieve a good bonding effect on the warp and weft yarns of the woven fabric, ensuring the uniformity and stability of the peel strength of the composite fabric and a high quality feel.

[0023] 2. The staggered arrangement of hot melt adhesive dots in this invention can make the peel strength of the composite fabric more uniform and stable.

[0024] 3. This utility model designs an effective adhesive dot coverage coefficient for the adhesive layer. When the adhesive dot coverage coefficient W satisfies 14≤W≤28, the peel strength is >2.5N, resulting in excellent peel strength between the fabric and the plastic film layer. When W is 17≤W≤28, a peel strength of >4.8N can be achieved. By balancing the number of tissue points covered by each adhesive dot, the uniform distribution of adhesive dots in the composite fabric can be further ensured, resulting in uniform bonding, smooth fabric surface, and comfortable feel.

[0025] 4. Based on balancing the number of tissue points covered by each adhesive dot, this utility model limits the floating lines of the fabric to further ensure that the adhesive dots of the composite fabric are evenly distributed and the bonding effect is uniform, making the fabric surface more even and the feel more comfortable.

[0026] 5. By optimizing the yarn thickness, plastic film material and thickness, this utility model can make the composite fabric surface smooth and uniform, with a delicate and comfortable feel and a strong sense of quality. Attached Figure Description

[0027] Figure 1 This is a magnified 200x image of the composite fabric of Embodiment 10 of this utility model after it has been peeled apart.

[0028] Figure 2 This is a schematic diagram of the staggered arrangement of the glue dot matrix in an embodiment of this utility model;

[0029] Figure 3 This is a schematic diagram of the aligned rows and columns of adhesive dots in an embodiment of this utility model. Detailed Implementation

[0030] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments, so that those skilled in the art can better understand and implement the technical solution of this utility model.

[0031] This utility model provides a composite fabric, such as Figure 1 As shown, it includes a top fabric 1, an intermediate adhesive layer 2, and a bottom plastic film layer 3. The top fabric 1 and the plastic film layer 3 are bonded together by the intermediate adhesive layer 2. The top fabric 1 is a woven fabric, and the intermediate adhesive layer 2 consists of evenly distributed hot melt adhesive dots. The warp and weft directions of the hot melt adhesive dots in the intermediate adhesive layer 2 are consistent with the warp and weft directions of the top fabric 1. The hot melt adhesive dots cover the weave points of the top fabric, and each hot melt adhesive dot covers one or more weave points.

[0032] In some preferred embodiments: the hot melt adhesive dots are arranged in staggered rows and columns, for comparison. Figure 2 The misalignment of rows and columns in the dot matrix and Figure 3As can be seen from the alignment of the matrix rows and columns, when the distance between adhesive dots is the same, and the matrix is ​​staggered in the same area, the distribution of adhesive dots is more uniform and the number of adhesive dots is greater, that is, more tissue points are covered, which can make the peel strength of the composite fabric more uniform and stable.

[0033] Let m be the number of hot melt adhesive dots per 10 mm along the warp or weft direction of the intermediate adhesive layer 2, and n be the number of tissue points covered by each hot melt adhesive dot. Let the dot coverage coefficient W = m + n, then 14 ≤ W ≤ 28.

[0034] In some preferred embodiments: the number of warp yarns that continuously cross weft yarns in the woven fabric is defined as the warp float length, and the number of weft yarns that continuously cross warp yarns is defined as the weft float length, then the warp float length is ≤2 and the weft float length is ≤2.

[0035] In some preferred embodiments: 17≤W≤28, under which case the peel strength exhibits superior and stable results. When the warp and weft densities of the intermediate adhesive layer are the same, the adhesive dots can be more evenly distributed in the fabric and film layers, resulting in uniform and stable peel strength along the warp and weft directions of the composite fabric.

[0036] In some preferred embodiments, both the warp and weft yarns are filament bundles. The warp yarn has a thickness of 50D to 300D, and the weft yarn has a thickness of 50D to 300D. The purpose of using filament bundles is that they consist of continuous long fibers, while short-fiber yarns or plied yarns are twisted and bound together. Compared to short-fiber yarns, filament bundles have superior strength and uniformity, and are better able to ensure that adhesive dots are evenly dispersed within the fibers, increasing the fabric's evenness. The yarn used should not exceed 300D; excessively thick yarns will cause unevenness in the fabric surface, large gaps at interlacing points, and thus problems such as adhesive seepage and poor bonding strength. The yarn should not be less than 50D; when the yarn is too fine, the fabric is thin and prone to sheerness, resulting in a glossy fabric surface and an added plastic feel to the composite fabric, leading to a poor overall quality. The closer the thickness of the filament bundles used in the warp and weft directions, the better the uniformity of the adhesive dots and the better the uniformity of the fabric surface.

[0037] In some preferred embodiments: the warp yarn and the weft yarn are made of at least one of polyester, nylon, or regenerated cellulose fiber. Polyester fiber has high strength and good abrasion resistance, and its fabric surface is delicate and smooth, with a strong sense of quality; nylon fiber is easy to print and dye, has excellent strength and abrasion resistance, good shape retention, high quality, and excellent durability; regenerated cellulose fiber provides a natural skin-friendly feel and good breathability, is environmentally friendly and sustainable, has a small impact on the environment, and can meet consumers' demand for green consumption. The above materials can balance the quality of the material and its durability, while also being cost-effective and suitable for mass production.

[0038] In some preferred embodiments: the plastic film layer 3 contains a low-melting-point material with a melting point or melting temperature in the range of 60-110°C, including m-PE, POE, EVA, EMA, EBA, or low-melting-point LDPE. When hot melt adhesive is applied to the fabric and the plastic film, the applied temperature is 100-110°C. At this temperature, the crystalline regions of the low-melting-point material undergo localized melting, and the flowability of the amorphous chain segments is significantly enhanced, increasing the wettability and surface energy of the plastic film surface. This facilitates the full penetration of the adhesive into the micropores or irregular areas of the film surface, thereby increasing the interfacial diffusion and interpenetration between the plastic film and the adhesive. After cooling and curing, the interfacial anchoring effect and van der Waals forces are enhanced, and the bonding strength is significantly improved.

[0039] In some preferred embodiments, the plastic film layer 3 can be made of multilayer co-extruded film, composite film, or single-component film. Multi-component film materials can fully leverage the complementary advantages of different materials, giving the plastic film superior mechanical strength, barrier properties, and tear resistance, thereby effectively broadening the application range of the final composite fabric.

[0040] In some preferred embodiments, the thickness of the plastic film layer 3 is 0.03 mm to 0.08 mm. If the plastic film layer is too thin, the composite fabric is prone to damage and holes; if it is too thick, the composite fabric feels too stiff.

[0041] In some preferred embodiments: the hot melt adhesive of the intermediate adhesive layer 2 is at least one of polyurethane, rubber, and acrylate with a melting point of 60-120°C. When the hot melt adhesive is applied to the fabric and the plastic film, at a temperature of around 100-110°C, the adhesive can effectively melt and soften, and fully bond the plastic film layer and the fabric layer, enhancing interfacial diffusion and penetration.

[0042] The technical content of this utility model will be described in detail below with reference to the embodiments:

[0043] Table 1: Examples and Comparative Examples of Composite Fabrics

[0044]

[0045]

[0046] Ideally, the glue dots are circular. When calculating the number of glue dots in the warp and weft directions, the starting point is located outside the glue dot, and the ending point is located outside or inside the glue dot. Specifically, if the ending point is inside the glue dot, glue dots with an area less than 1 / 4 of a standard glue dot circle are not counted; glue dots with an area between 1 / 4 and 3 / 4 of a standard glue dot circle are counted as 0.5; and glue dots with an area between 3 / 4 and 1 standard glue dot circle are counted as 1.

[0047] Table 2: Peel strength and fabric surface evaluation of each composite fabric in Table 1 (peel strength is performed according to the A method for composite films in standard GB / T 8808-1908 Peel Test Method for Flexible Composite Plastic Materials).

[0048]

[0049]

[0050] Table 3: Peel Strength Table

[0051] Peel strength Subjective evaluation 1.5N and below With a gentle pull, the fabric and film can be separated. 1.5N < peel strength ≤ 2.5N With a little force, the fabric and membrane separate. 2.5N < peel strength ≤ 4.5N Forceful peeling can separate the fabric and the film. 4.5N < peel strength ≤ 8N When forcefully peeled, the membrane deforms and becomes difficult to separate. 8N < Peel strength If you try to peel it off forcefully, the membrane will deform or even rupture, making it difficult to separate.

[0052] Comparative Example 1, compared with Example 11, kept the yarn thickness, float length, and warp and weft adhesive dot density unchanged, reduced the number of fabric points covered by each adhesive dot n to 1, and its adhesive dot coverage coefficient to 12. The peel strength decreased significantly, and the fabric and film separated with slight force.

[0053] Comparative Example 2, compared with Example 11, kept the yarn thickness, float length, and the number of weave points n covered by each adhesive dot unchanged, but reduced the adhesive dot density in the warp and weft directions to 6 / 10mm, with an adhesive dot coverage coefficient of 10. The peel strength decreased significantly, and the fabric and film separated with slight force.

[0054] Comparative Example 3, compared with Example 13, kept the yarn thickness, float length, and the number of weft points n covered by each adhesive dot unchanged, but reduced the adhesive dot density in the warp and weft directions to 5 per 10 mm. The adhesive dot coverage coefficient was 8, and the peel strength was significantly reduced. With a little force, the fabric and the film separated.

[0055] Comparative Example 4, compared with Example 13, kept the yarn thickness and float length unchanged, reduced the density of adhesive dots in the warp and weft directions to 5 / 10mm, reduced the number of tissue points covered by each adhesive dot n to 2, and its adhesive dot coverage coefficient to 7. The peel strength decreased significantly, and the fabric and film separated with a gentle pull.

[0056] Comparative Example 5, Control Example 2, keeping the yarn thickness, float length, and the number of weft points n covered by each adhesive dot unchanged, the density of warp and weft adhesive dots was increased to 17 / 10mm, with an adhesive dot coverage coefficient of 31. When peeled with force, the fabric and film were difficult to separate, but adhesive seepage appeared on the fabric surface, resulting in poor uniformity.

[0057] Comparative Example 6, compared with Example 1, kept the yarn thickness, float length, and warp and weft adhesive dot density unchanged, increased the number of fabric points covered by each adhesive dot n to 20, and its adhesive dot coverage coefficient to 34. When peeled with force, the fabric and film were difficult to separate, but adhesive seepage appeared on the fabric surface, and the uniformity was poor.

[0058] Extensive user experience has demonstrated that when the peel strength exceeds 2.5N, the composite fabric exhibits good durability, meeting the needs of subsequent product manufacturing and consumer use. The fabric obtained by this invention possesses excellent peel strength (peel strength > 2.5N), with a preferred adhesive dot coverage coefficient of 17 ≤ adhesive dot coverage coefficient W ≤ 28, achieving a peel strength greater than 4.8N. Furthermore, the composite fabric exhibits excellent, uniform, and stable peel strength, a smooth and even surface, and a high-quality feel.

[0059] Extensive experiments have demonstrated a strong correlation between the adhesive dot coverage coefficient W and the peel strength of this invention. When the adhesive dot coverage coefficient W is less than 14, the peel strength exhibits a very significant downward trend, which will significantly affect the product's service life. When the adhesive dot coverage coefficient W is greater than 28, due to the large amount of adhesive applied, adhesive aggregation and uneven distribution of adhesive dots are likely to occur, and some adhesive dots may even seep back onto the other side of the fabric. This results in severely uneven peel strength of the composite fabric with large deviations, leading to poor consistency in the product's peel strength.

[0060] Experiments have shown that when the float length is greater than 2, the peel strength of the composite fabric decreases significantly. This is because when some adhesive dots adhere to the float length rather than the weave points, the adhesive cannot be effectively distributed to the other yarn system, resulting in ineffective adhesive application or directional peel strength (i.e., the peel strength of the fabric and the film differs greatly in two directions). This leads to poor adhesion of the adhesive to the fabric, resulting in poor peel strength of the composite fabric.

[0061] Further experiments have shown that when the float length is ≤2, the fabric surface is relatively flat and uniform, and the adhesive dots can be distributed as evenly as possible at the interlacing points of the warp and weft yarns, i.e., the weaving points. This can achieve a good bonding effect on the warp and weft yarns of the woven fabric, ensuring the uniformity and stability of the peel strength of the composite fabric and a strong sense of quality.

[0062] Multiple experimental studies have found that when 1 ≤ n ≤ 14 and m > 11, the adhesive dots can be distributed more evenly, resulting in uniform bonding, peel strength, and hand feel of the composite fabric. As the number of tissue points covered by each adhesive dot (n) decreases, the corresponding adhesive dot density increases. When the adhesive dots are small and dense, the bonding strength of the composite fabric is relatively uniform and stable. When m < 11, the peel strength is low and uneven. Increasing the number of tissue points covered by each adhesive dot (n) decreases the corresponding adhesive dot density; however, the value of n cannot increase indefinitely. When the number of tissue points covered by each adhesive dot (n) > 14, the adhesive dots may not spread properly, resulting in uneven adhesive distribution and glue seepage, leading to poor fabric uniformity and unstable peel strength.

[0063] contrast Figure 2 The misalignment of rows and columns in the dot matrix and Figure 3As can be seen from the alignment of the rows and columns of the dot matrix, when the distance between the adhesive dots is the same and the dot matrix is ​​staggered in the same area, the distribution of adhesive dots is more uniform and the number of adhesive dots is greater, that is, more tissue points are covered, resulting in a more uniform and stable peel strength.

[0064] The above embodiments are merely preferred embodiments of this utility model, but they cannot be construed as limiting the utility model. Any modifications and improvements made based on the concept of this utility model should fall within the protection scope of this utility model, and the specific protection scope is subject to the claims.

Claims

1. A composite sheet material comprising a surface sheet material, an intermediate adhesive layer, and a bottom layer of a plastic film layer, the surface sheet material and the plastic film layer being bonded by the intermediate adhesive layer, characterized in that: The outer fabric is a woven fabric, and the middle adhesive layer is a uniformly distributed hot melt adhesive dot. The warp and weft directions of the hot melt adhesive dots in the middle adhesive layer are consistent with the warp and weft directions of the outer fabric. The hot melt adhesive dots cover the weave points of the outer fabric, and each hot melt adhesive dot covers one or more weave points.

2. The composite facing material of claim 1, wherein: The hot melt adhesive dots are arranged in staggered rows and columns.

3. The composite fabric according to claim 1, characterized in that: Let m be the number of hot melt adhesive dots every 10 mm along the warp or weft of the intermediate adhesive layer, and let n be the number of tissue points covered by each hot melt adhesive dot. Let the dot coverage coefficient W = m + n, then 14 ≤ W ≤ 28.

4. The composite fabric according to claim 3, characterized in that: In the woven fabric, the number of warp yarns that continuously cross weft yarns is defined as the warp float length, and the number of weft yarns that continuously cross warp yarns is defined as the weft float length. Therefore, the warp float length is ≤2 and the weft float length is ≤2.

5. The composite fabric according to claim 3, characterized in that: The coverage factor of the adhesive dots is denoted as W, where 17 ≤ W ≤ 28.

6. The composite fabric according to claim 5, characterized in that: The number of tissue points covered by each hot melt adhesive dot is denoted as n, where 1 ≤ n ≤ 14. The number of hot melt adhesive dots per 10 mm along the warp or weft of the intermediate adhesive layer is denoted as m, where m ≥ 11.

7. The composite fabric according to claim 4, characterized in that: Both the warp yarn and the weft yarn are long filament bundles, with the warp yarn having a thickness of 50D to 300D and the weft yarn having a thickness of 50D to 300D.

8. The composite fabric according to any one of claims 1 to 7, characterized in that: The plastic film layer contains a low-melting-point material with a melting point or melting temperature in the range of 60 to 110°C, including m-PE, POE, EVA, EMA, EBA, or low-melting-point LDPE.

9. The composite fabric according to claim 8, characterized in that: The thickness of the plastic film layer is 0.03mm to 0.08mm.

10. The composite fabric according to claim 8, characterized in that: The hot melt adhesive of the intermediate adhesive layer is at least one of polyurethane, rubber, and acrylate with a melting point of 60-120°C.

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