Moisture permeable and waterproof elastic fabric and method for manufacturing the same

Abstract

The present application aims at the deficiencies of poor moisture permeability and folding resistance and easy peeling of the prior art moisture permeable waterproof elastic fabric, and provides a moisture permeable waterproof elastic fabric and a preparation method thereof.The fabric comprises a fabric layer, a moisture permeable film layer and a glue layer, the fabric layer and the film layer are integrally formed by point bonding to form the glue layer, the film layer is a PU film, the single film elastic elongation is greater than or equal to 100%, the fabric layer is an elastic fabric, the elongation of the fabric layer is greater than or equal to 15%, and the weft elongation of the fabric is greater than or equal to 8.0%.The fabric with the structure of the present application is characterized in that the fabric layer is an elastic fabric, the film layer is a PU film, the fabric layer is bonded on at least one side of the film layer by point bonding, and the glue is uniformly arranged on one side or both sides of the film in a point form.The weft elongation of the whole fabric is greater than or equal to 8.0%, the film layer retains good ductility, the elasticity of the fabric layer and the film layer is matched, the folding resistance is good, and the fabric can reach 3000 times at minus 25 DEG C, and the glue point can resist a peeling force of 7.9 N at minus 25 DEG C.

Description

Technical Field

[0001] This invention relates to a functional fabric, and more particularly to an elastic fabric with breathable and waterproof properties and its preparation method. Background Technology

[0002] Currently, due to consumers' increasing demands for comfort in clothing fabrics, fabrics are developing towards elasticity and breathability. There is a consensus in the industry that "no fabric is complete without elasticity," and fabric elasticity is a crucial indicator of fabric quality and grade. However, achieving both elasticity and good breathability and waterproofness in a fabric is contradictory, and it is difficult to achieve both simultaneously with current technology. Therefore, the market urgently needs a fabric that can satisfy the requirements of breathability, waterproofness, and good elasticity. The industry has conducted extensive research in this area. For example, Chinese invention patent application number CN201410684486.5, entitled "An Elastic Three-Layer Waterproof and Breathable Composite Fabric and Its Production Process," discloses a three-layer composite fabric. Its outer fabric is a woven or knitted elastic fabric, the middle layer is an elastic film layer, and the bottom fabric (inner layer) is a knitted napped fabric. The outer, inner, and middle layers are bonded together by hot-melt bonding with moisture-curing polyurethane as an adhesive. Due to the use of hot-melt bonding, the hot-melt adhesive coating is laminated onto the composite fabric. With this structure, although all three layers are elastic materials... However, because the adhesive layer is a coating, it hardens after drying, significantly reducing the fabric's elasticity. Simultaneously, the membrane's moisture permeability, water pressure resistance, and folding resistance also decrease drastically, and the adhesive easily peels off. Therefore, the comfort and lifespan of waterproof and breathable clothing are greatly compromised. Despite years of research, the industry has struggled to overcome the challenges of achieving optimal fabric elasticity, moisture permeability, water pressure resistance, and folding resistance. Currently, even the highest-grade fabrics only achieve a moisture permeability of 3000g / m²·24H (GB / T 12704.1 positive cup moisture absorption method) and can only withstand about 2000 folds before being damaged and peeling off. Especially in low-temperature environments, the membrane's brittleness increases, further reducing the folding resistance; for example, at temperatures below -10 degrees Celsius, the folding resistance is only about 1500 times. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing breathable and waterproof elastic fabrics, such as poor breathability and folding resistance, easy peeling of adhesive leading to poor fabric comfort and short lifespan, by providing a breathable and waterproof elastic fabric and its preparation method.

[0004] A breathable and waterproof elastic fabric, the fabric comprising a fabric layer, a breathable membrane layer and an adhesive layer, wherein the fabric layer and the membrane layer are bonded together by adhesive dots to form the adhesive layer, the membrane layer is a PU membrane with a single membrane elastic elongation ≥100%, the fabric layer is an elastic fabric with an elongation ≥15%, and the weft elongation of the fabric is ≥8.0%.

[0005] The fabric layer includes fabric layer one and fabric layer two, which are bonded to both sides of the film layer by adhesive dots. The elastic elongation of the single film is ≥140%, and the elongation of the fabric layer is ≥20%.

[0006] The moisture permeability of the fabric is ≥3500g / m². 2 • 24H (GB / T 12704.1 Positive Cup Moisture Absorption Method), and / or the water pressure resistance of the fabric is ≥5000mm, and / or the weight of the fabric is 150-180g / m. 2 ;

[0007] The coverage of the adhesive dots on the film layer is 30-50%; and / or the diameter of the adhesive dots is less than or equal to 0.65 mm and greater than or equal to 0.25 mm, the thickness is 0.07-0.12 mm, the center distance between the dots and grooves when the plane is unfolded is 0.998 mm, the error of the diameter, thickness and center distance of the adhesive dots is ±0.005 mm, and the amount of adhesive applied is 10g-20g;

[0008] The membrane is a highly moisture-permeable transparent PU membrane with a thickness of 0.012mm-0.020mm; and / or a moisture permeability >5000g / m³. 2 • 24H; and / or water pressure greater than 10000 mm; and / or the elongation of the fabric layer ≥ 13%; and / or the membrane layer uses a microporous high-permeability PU membrane with a thickness of 0.012 mm-0.020 mm, a single membrane elastic elongation of 142-210%, a membrane water pressure ≥ 10000 mm, and a moisture permeability ≥ 8000 g / m³. 2 24H, with 7 billion micropores / M2 and a pore size of 0.1μmm;

[0009] The fabric layer is a woven fabric and / or a knitted fabric. When it is a woven fabric, its weft elongation is 20-40%, and when it is a knitted fabric, its weft elongation is 30-55%.

[0010] The first fabric layer is a woven fabric, and the second fabric layer is a knitted fabric; and / or the first fabric layer is a twill weave, with warp yarns made of non-elastic polyester untwisted yarn with a count of 75-100D, and weft yarns made of fine denier high-elastic polyester untwisted yarn with a count of 75D-100D, and the yarn's own crimp shrinkage rate is 32±3%. The second fabric layer is a straight yarn knitted weft-knitted fabric or ribbed fabric, which is a 15-40D / 14-48F fine denier polyester 36-42 gauge knitted single-sided fabric with a yarn weight of 16-35 grams; or the second fabric layer is a straight yarn knitted weft-knitted fabric or ribbed fabric, which is a 20-40D / 14-48F fine denier polyester 36-42 gauge knitted single-sided fabric with a yarn weight of 20-30 grams; or the knitted fabric is a 15D-30D single-sided knitted fabric with a weight of 16-35 grams per square meter.

[0011] Another objective of this invention is to provide a method for preparing a breathable and waterproof elastic fabric, the fabric comprising a fabric layer and a film layer, the fabric layer and the film layer being bonded together by adhesive dots, characterized in that the preparation is carried out according to the following method: the fine fabric layer is an elastic fabric layer with an elasticity greater than or equal to 20%, the film layer is a breathable PU film with a single-film elastic elongation ≥140%, adapted to the elongation of the fabric layer, and a bonding roller is used for bonding, so that the coverage of adhesive dots on the film layer is 30-50%, and the weft elongation of the obtained fabric is ≥8.0%, with the adhesive dots evenly distributed on the film layer;

[0012] A bonding roller with circular grooves is used. The diameter of the circular grooves is 0.65 mm and the depth is 0.1-0.23 mm. When the plane is unfolded, the center distance between the circular grooves is 0.998 mm. The amount of adhesive applied is 10-20 g. The adhesive is scraped across the surface of the roller by a scraper. The transfer rate of adhesive from the circular grooves to the film layer is 39% to 40%. The film surface is covered with circular adhesive dots with gaps. It is best to use a moisture-permeable adhesive. The adhesive temperature is 90℃. The gap between the roller and the film layer is 0.07 mm. The bonding speed of the roller is 15 m / min to achieve an adhesive transfer rate of 39% to 40%.

[0013] Fabrics with an elongation of ≥30% are used as fabric layer one and fabric layer two. Fabric layer one and fabric layer two are located on both sides of the film layer and are bonded together by adhesive dots. When the fabric is a woven fabric, the weft yarn is fine denier high-elastic untwisted yarn with a specification of 75D-100D and a yarn self-curling shrinkage rate of 32±3%. The warp yarn is fine denier untwisted yarn with a specification of 75D-100D and a twist rate of 2000+ / Inch. 2 The bonding roller performs spot bonding; when the fabric is knitted, use a 20-40D / 12-48F fine denier 36-42 gauge single-sided knitted fabric, with a yarn weight of 20-30 grams and a yarn density of 2000+ / Inch. 2 The bonding roller performs spot bonding; during spot bonding, the adhesive dots are located between the first fabric layer and the film layer, and between the second fabric layer and the film layer, and the yarn is polyester.

[0014] The fabric using the structure of this invention has an elastic fabric layer and a PU film layer. The fabric layer is bonded to at least one side of the film layer by point bonding. The adhesive is evenly arranged in dots on one or both sides of the film. The weft elongation of the entire fabric is ≥8.0%, which allows the film layer to retain good extensibility. The elasticity of the fabric layer and the film layer are matched, and the folding resistance is good, reaching 3000 times at -25°C. The adhesive dots can resist peeling at -25°C with a force of 7.9N and are not prone to embrittlement and peeling. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the layered structure of the method for preparing the breathable and waterproof elastic fabric of the present invention.

[0016] Explanation of reference numerals in the attached figures

[0017] 1-Fabric layer one; 2-Fabric layer two; 3-Film layer; Detailed Implementation

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

[0019] An embodiment of the present invention provides a breathable and waterproof elastic fabric comprising at least three layers: a membrane layer 3, a fabric layer, and an adhesive layer. The fabric layer is made of elastic fabric, and the membrane layer is made of a breathable, waterproof, and elastic PU membrane. The fabric layer and the membrane layer are bonded together by adhesive dots to form an adhesive layer. The adhesive layer is uniformly distributed in dots or in a certain arrangement, for example, the adhesive dots are arranged in a certain geometric shape or small pattern, and then uniformly distributed between the geometric shapes or small patterns. For example, the adhesive dots are arranged in a pentagonal, triangular, rectangular, circular, rhomboid, petal, or leaf shape. The adhesive dots are evenly distributed after application, ensuring gaps between them and preventing them from forming a complete adhesive layer on the film surface. Using the above-described structure of this invention, the breathable and waterproof elastic fabric exhibits good elasticity. Since both the film and fabric layers possess inherent elasticity, and the adhesive layer is distributed as dots, the overall weft elongation of the fabric is ≥8%. Therefore, the fabric displays good elasticity. The dotted adhesive layer preserves the elasticity of the film layer, while the unadhesive areas at folds maintain the film layer's softness, providing a cushioning effect. The film is not damaged by stretching or bending during folding, and the adhesive dots are less prone to brittleness and peeling, resulting in a long lifespan. Preferably, the coverage rate of the adhesive dots on the film layer is 30-50%. This ensures good bonding between the film and fabric layers while minimizing the impact on the film's breathability and elasticity, maintaining good elasticity, breathability, and water pressure resistance. The fabric layer of this invention can also consist of two layers, serving as the face fabric and the back fabric, with the film layer located between them and bonded together by adhesive dots. Using the aforementioned fabric, which includes both the face fabric and the back fabric, the membrane has fabric layers on both sides that are bonded together with adhesive dots. This provides better protection and support for the membrane, preventing it from coming into direct contact with the external environment, skin, or underwear, thus increasing the membrane's durability and extending the fabric's lifespan.

[0020] In this invention, the preferred membrane layer is a highly moisture-permeable transparent PU membrane with a thickness of 0.012mm-0.020mm and a single-film elastic elongation ≥100%, preferably ≥140%. This membrane layer possesses good elasticity and softness, further increasing the overall folding capacity of the fabric. For good moisture permeability of the fabric, the preferred membrane moisture permeability is ≥5000g / m³. 2• For good water pressure resistance, the membrane should withstand ≥10000 mmH24. The aforementioned breathable membrane is commercially available, such as the high-permeability membrane produced by Wuxi Xishengfa Textile Trading Co., Ltd. The fabric layer can be made of woven or knitted fabrics, which are inherently elastic. Preferably, the elongation of the fabric layer is ≥15%, more preferably ≥20%. This better maintains the elasticity matching between the fabric layer and the membrane layer, ensuring their extensibility is compatible. When the fabric is stretched, their extensibility remains essentially consistent, improving fold resistance. The fabric of this invention uses adhesive evenly distributed in dots on both sides of the membrane. Compared to fabrics that use a full-coverage roller coating method to form a complete adhesive layer on the membrane surface, this allows the membrane layer to retain its extensibility. Combined with the elasticity of the outer and backing fabrics, this ensures that the fabric retains its water pressure resistance and moisture permeability even in low-temperature environments, such as -20°C and above, including rain and snow. Furthermore, the adhesive dots will not become brittle or peel off. The integrity of the membrane layer remains intact even after 3000 folds at temperatures above -25°C, maintaining good moisture permeability and water pressure resistance. Moisture permeability reaches ≥3500g / m². 2 • 24H (GB / T 12704.1 Positive Cup Moisture Absorption Method), water pressure resistance ≥5000mm, exceeding current industry requirements for fabric moisture permeability and water pressure resistance. No degradation occurred due to extreme low-temperature environments. To further enhance wearing comfort, the fabric weight is preferably 150-180g / m². 2 This fabric not only has good elasticity, breathability, water pressure resistance, and folding resistance, but is also lightweight and thin to wear, better meeting market demands.

[0021] The fabric of the present invention is prepared by the following method:

[0022] The following describes in detail the fabric preparation method of the present invention, taking the example of a fabric layer consisting of a face fabric and a back fabric. When the fabric layer is only a face fabric or a back fabric, adhesive is applied to one side of the film layer, and the rest is the same as when the fabric layer consists of a face fabric and a back fabric, which will not be described further here.

[0023] The fabric layers include Fabric Layer 1 and Fabric Layer 2, which serve as the face or base fabric. Fabric Layer 1 can be a woven fabric made of elastic yarn or a knitted fabric. Both Fabric Layer 1 and Fabric Layer 2 can be knitted, both can be woven, or Fabric Layer 1 can be woven and Fabric Layer 2 can be knitted. To achieve a lightweight effect, when using woven fabric, both the weft and warp yarns are fine denier yarns. The weft yarns are fine denier elastic yarns with a specification of 75D-100D and a yarn self-curling shrinkage rate of 32±3%. The warp yarns are fine denier non-elastic yarns with a specification of 75D-100D. Both the warp and weft yarns are untwisted to achieve a soft and supple hand feel. The weft elongation of the fabric layer is greater than or equal to 30%. When using knitted fabric, a 20-40D / 12-48F fine denier 36-42 gauge single-sided knitted fabric is used with an elongation greater than or equal to 60%. To achieve a more cotton-like hand feel, the yarns are all made of polyester or nylon. Ideally, when the fabric is knitted, the elongation of the fabric layer should be greater than or equal to 20%. The membrane layer uses an elastic, breathable membrane with a single membrane elastic elongation >100%. The membrane layer is bonded to fabric layer one and fabric layer two by point bonding with an adhesive. During point bonding, the coverage of the adhesive dots on the membrane layer is 30-50%. In specific operation, an adhesive roller is used to apply adhesive to the membrane, distributing dots of adhesive on both surfaces of the membrane layer. When the membrane layer is bonded to fabric layer one and fabric layer two, the fabric layer one and fabric layer two adhere to the membrane layer. At this time, the dots of adhesive are flattened, bonding fabric layer one and fabric layer two together. The fabric prepared by the method of the present invention has elastic fabrics on both sides of the film layer, and the coverage of the adhesive dots on the film layer surface is 30-50%. The adhesive dots can not only firmly bond the fabric layers on both sides to the film layer, but also leave elastic space and moisture permeability space for the film layer. The elastic fabrics on both sides provide relatively strong support for the film layer when the film layer is stretched and deformed. In particular, when the fabric layer is a woven fabric and the warp yarn is non-elastic yarn, the warp yarn provides favorable support for the film layer when the fabric is stretched and deformed, and the weft yarn provides elastic deformation. Therefore, the influence of adhesive dots on the elasticity of the film layer can be reduced, so that the fabric maintains good elasticity overall.

[0024] When bonding adhesive dots, the following bonding process is preferred: A bonding roller with circular grooves is used, with a certain gap between each groove. The diameter of the groove is 0.65 mm, and the depth is 0.1-0.23 mm, preferably 0.1-0.15 mm. When unfolded, the center distance between the grooves is 0.998 mm. The amount of adhesive applied is 10g-20g. The adhesive is scraped across the roller surface by a scraper, transferring it into the grooves. As the roller rolls over the film layer, the adhesive is transferred from the grooves to the film layer. The transfer rate is 39%-40%, resulting in a film surface covered with spaced circular adhesive dots. The spacing between the dots matches the spacing between the grooves, and the center distance is 0.998 mm. These are the design specifications; however, there may be some manufacturing errors during actual production, with an error range of ±0.005 mm. Using the above process parameters, due to the certain depth of the dotted grooves, the adhesive inside the grooves cannot be completely transferred to the film surface, leaving some adhesive untransferred. This controls the adhesive transfer rate at 39-40%. These parameters ensure stable adhesive application, stable spacing between adhesive dots, and uniform dot size. Verification has shown that this guarantees water pressure resistance above 5000 N, moisture permeability above 4000 N, and peel strength above 8.3 N, giving the fabric excellent water pressure resistance, moisture permeability, and peel resistance. The best adhesive used is a moisture-permeable PUR hot melt adhesive at 90℃, with a 0.07mm gap between the roller and the film, and a roller lamination speed of 15 m / min. This achieves an adhesive transfer rate of 39%–40%.

[0025] The fabric using this invention controls the adhesive dots on the membrane surface to have a coverage rate of 30-50%. This prevents more adhesive dots from covering more of the membrane surface, thus preventing a decrease in water pressure and moisture permeability. It also prevents the membrane from peeling off from the fabric layer, which helps to resolve the contradiction between peeling and moisture permeability. This allows the fabric to achieve a better balance between water pressure, moisture permeability, and peeling, ensuring that the fabric as a whole maintains good moisture permeability and water pressure while preventing unnecessary peeling between the fabric layer and the membrane layer. In addition, the overall weft elongation of the fabric is ≥8.0%, thus maintaining good extensibility and improving the fabric's folding resistance.

[0026] In a preferred embodiment of this invention, the first fabric layer is a woven fabric, and the second fabric layer is a knitted fabric. Because knitted fabrics have excellent elasticity and their own structure creates pores, the amount of adhesive applied and the pressure of the bonding roller are controlled during lamination to prevent the adhesive from penetrating the knitted pores of the second fabric layer. This keeps the film flat in the middle, which not only helps the fabric maintain good elasticity but also improves its smoothness. The adhesive is located on the surface of the breathable membrane, on the one hand bonding the first and second fabric layers to the membrane at specific points; on the other hand, the adhesive on the surface of the breathable membrane... The adhesive dots peek out from the gaps in the second fabric layer, creating bright spots that bond the membrane and the second fabric layer together. During washing and wearing, these dots remain concealed within the second fabric layer. In low-light conditions, they are barely visible; in bright light, they are very bright. Because the adhesive dots are located within the second fabric layer and are shielded by the yarns, they are not directly exposed, making them less prone to detachment and providing good durability and washability. The adhesive is distributed in a dotted pattern between the second fabric layer and the membrane, maintaining the fabric's breathability and ensuring comfortable wear. This invention's fabric structure features bright spots in the gaps of the second fabric layer. By controlling the density, shape, and size of these dots, the visual effect on the surface of the second fabric layer can be varied, enriching the fabric's variety. When the dots are dense, a starry effect can be achieved, making it more suitable for occasions like entertainment parties. When garments are made from a fabric with two layers—one woven and the other knitted—that creates a shimmering effect, the garments can be worn on both sides for different occasions, giving one garment two distinct styles. This is particularly suitable for use on two different occasions, reducing the amount of clothing to carry and improving convenience. By employing the yarn and weave structure, as well as the distribution and amount of adhesive dots used in this invention, a subtle, visible sheen can be formed on the fabric surface. Under light, these shimmering dots appear like a dense cluster of stars. To highlight the shimmering effect, the yarn is preferably a single color that is clearly distinguishable from the adhesive color. The shimmering dots can be round, diamond-shaped, or polygonal, but round dots are preferred. Compared to diamond-shaped dots, the adhesive adheres more firmly to the film and fabric, resulting in stronger peel strength and greater wash resistance. Compared to diamond-shaped dots, round dots require slightly more adhesive. Furthermore, the circular adhesive dots have a larger contact area with the fabric, and their curved edges provide stronger grip and higher peel strength than triangles. Because full lamination involves applying a thick layer of adhesive to the membrane surface and then bonding it to the fabric, the entire membrane surface is covered in adhesive without any gaps. In contrast, dot-application involves evenly distributing small dots of adhesive across the membrane surface, creating gaps in the breathable membrane. Therefore, dot-application results in a more fluffy and softer fabric compared to full lamination. Fabric layer one uses woven fabric, while fabric layer two uses knitted fabric. When subjected to water impact, the woven fabric's higher weave structure and the non-elastic yarns in the warp direction provide support for membrane deformation, resulting in good water pressure resistance. This achieves both a soft feel and excellent water pressure resistance.

[0027] To achieve a better highlight effect, the second fabric layer should ideally be a single color with a significant color difference from the adhesive dots. Pores in the first and second fabric layers can be created by punching holes in the fabric layers, or by reducing the density of the first and / or second fabric layers.

[0028] In a further preferred embodiment of the present invention, the adhesive is a breathable hot melt adhesive, the first fabric layer adopts a twill weave, such as 2 / 2, 1 / 1, or 2 / 1 twill, the warp yarns are non-elastic polyester untwisted yarns with a count of 75-100D, the weft yarns are fine denier high-elastic polyester untwisted yarns with a count of 75D-100D, and the yarn's own crimp shrinkage rate is 32±3%. Using the above-mentioned weave structure and type of yarn, the first fabric layer has a relatively strong texture, strong three-dimensionality, soft and silky hand feel, and a velvety feel. The elongation of the first fabric layer can reach 30±3%. The second fabric layer adopts a knitted fabric, which is a straight yarn knitted weft-knitted fabric or ribbed fabric. This invention uses a 20-40D / 14-48F fine denier polyester 36-42 gauge knitted single-sided fabric with a yarn weight of 20-30 grams. The fabric layer two, employing this structure, has a fine and smooth surface with high elasticity. This type of knitted single-sided fabric has an elastic elongation rate >70%, which maximizes the matching of the weft elasticity of fabric layer one, ensuring a proper balance between the elasticity of fabric layer one and fabric layer two. This improves the fabric's folding resistance, reduces adhesive peeling, and provides appropriately sized gaps in the knitted fabric. The film layer of this invention is bonded to fabric layer one and fabric layer two using point bonding. Fabric layer one uses a 700+ to 800+ / inch... 2 The bonding rollers are used for bonding, and the second fabric layer uses a coating strength of 2000+ to 2100+ per inch. 2 The bonding rollers are used for bonding, and the amount of adhesive applied is strictly controlled. The optimal amount of adhesive for the first fabric layer is 15-17 g / m². 2 The amount of adhesive applied to the second fabric layer is preferably 10-20 g / m². 2 By employing specific adhesive application amounts and dot density, the peel strength is maximized while minimizing the impact on elasticity. When the adhesive application amount is below a certain level, the peel strength is poor, but the impact on fabric elasticity is minimal. Conversely, when the application amount is above this level, the peel strength is good, but the elasticity of the second fabric layer is compromised. This specific adhesive application amount and dot density ensure the knitted fabric surface is as smooth as possible and matches the stitch count of the second fabric layer. The size of the adhesive dots matches the pore size of the weave in the second fabric layer, allowing highlights to pass through the pores to create a shimmering effect without making the fabric too sparse, thus achieving a soft, supple feel and good elasticity. The membrane layer is preferably a microporous, high-permeability PU membrane with a thickness of 0.012mm-0.020mm, a single-membrane elastic elongation ≥100%, a membrane water pressure ≥10000mm, and a moisture permeability ≥8000g / m². 2• 24H, it has 7 billion micropores / m², with a pore size of 0.1μm. Since raindrops have a diameter of 100μm and water vapor has a diameter of 0.0004μm, it can give the fabric excellent breathability while preventing rainwater penetration. Using this type of high-transparency PU transparent film, combined with the elasticity, adhesive density, and adhesive amount of the fabric layer of this invention, can ensure that the fabric's moisture permeability is ≥3500g / m². 2 • 24H (positive cup method), water pressure resistance ≥5000mm. The fabric of this invention, using the above structure and composition, has an elongation ≥8%, good elasticity, a soft and supple hand feel, moisture permeability, and water resistance. Preferably, the knitted fabric is a 15D-30D single-knitted fabric with a weight of 16-35g / m². 2 Fabrics using the above-described structure and yarns exhibit a unique characteristic: the second fabric layer is knitted, and the knitted fabric structure itself creates pores. When the second fabric layer faces a light source, the adhesive dots coated on the membrane reflect light, which passes through the knitted pores in the second fabric layer, forming bright spots on its surface. Because the adhesive dots are typically densely packed during point bonding, and the knitted pores are dense and small, this creates a dense array of bright spots on the surface of the second fabric layer, resembling stars. Ideally, a single membrane with a water pressure >12000 mm and a moisture permeability >10000 g / m² is used. 2 •h, a microporous high-permeability membrane with a thickness of 0.008-0.015 mm.

[0029] Fabrics employing the structures described in the above embodiments, due to the elasticity of fabric layer one, membrane layer, and fabric layer two, and the fact that the three layers are bonded together by point bonding, reduce the amount of adhesive covering the membrane layer and fabric layer, especially reducing the amount of adhesive covering the membrane layer surface. Therefore, compared to applying a layer of adhesive to the membrane layer, the elasticity of the membrane layer decreases relatively less, resulting in a smaller overall decrease in the elasticity of the fabric. More of the elasticity of fabric layer one, fabric layer two, and the membrane layer is preserved. Consequently, the overall fabric has relatively good elasticity, a certain degree of elasticity, and good folding resistance. When fabric layer one is a woven fabric and the other is a knitted fabric, with both fabrics facing outwards, the fabric is more suitable for reversible use, allowing one fabric to have two different styles simultaneously. In this way, the wearer can choose the fabric facing outwards according to their own preferences or different environmental scenarios, achieving versatility. The membrane layer is preferably made of elastic and breathable membrane, as it is breathable and elastic, providing both waterproofing and breathability, thus ensuring a comfortable feel. The points where fabric layer one and fabric layer two are bonded, i.e., the adhesive application points, can be directly opposite each other or staggered. It is better to stagger them to better maintain the flatness of the film layers.

[0030] Woven fabrics can be plain weave, twill weave, satin weave, herringbone weave, jacquard, checkered fabric, etc. Generally speaking, twill and satin weaves are preferred because they offer better stretch. DTY yarn can be used for elasticity, or spandex yarn depending on the style requirements. Pattern selection and yarn combinations can be chosen according to different styles.

[0031] Compared with full-coverage, the present invention uses a rubber roller for spot application, which has the characteristics of lighter and fluffier feel, lower energy consumption during processing, better moisture permeability and better folding resistance.

[0032] Example 1

[0033] Fabric layer one uses a twill weave, such as 2 / 2, 1 / 1, or 2 / 1 twill. The warp yarns are non-elastic polyester untwisted yarn with a count of 75D, and the weft yarns are fine denier high-elastic polyester untwisted yarn with a count of 75D. The yarn's own crimp shrinkage rate is 32%. Using the above-mentioned weave structure and yarn type, fabric layer one has a strong texture, a strong three-dimensional effect, a soft and silky feel, and a velvety texture. The elongation of fabric layer one can reach 30%; Fabric layer two... The fabric used is a 20D / 24F fine denier polyester 36-42 gauge single-sided knitted fabric with a yarn weight of 20-30 grams. It features a second fabric layer, resulting in a smooth, fine surface and high elasticity. This type of knitted single-sided fabric has an elastic elongation of 30-55%. The membrane layer is a 0.012mm-0.020mm thick high-transparency PU transparent film with a single-film elastic elongation ≥140%, a single-film water pressure ≥10000mm, and a moisture permeability ≥8000g / m². 2 •h. When bonding the film layer to fabric layer one and fabric layer two, point bonding is used, with hot melt adhesive as the bonding agent. Fabric layer one uses 700+ / Inch. 2 The bonding rollers are used for bonding, with an adhesive application rate of 15-17 g / m². 2 The second fabric layer uses 2000+ / Inch 2 The bonding roller is used for bonding, and the amount of adhesive applied is 10g-20g / m. 2 Preferably 15-17 g / m 2 By using dot bonding, the fabric produced has a weft elongation of ≥8% and a moisture permeability of ≥3500g / m². 2 • 24H (positive cup moisture absorption method), water pressure resistance ≥5000mm, density 250-270T / IN, weight 155-175g / m³ 2 The fabric has a soft and supple feel, with a three-dimensional structure while also possessing a delicate velvety texture that is soft, dry, and highly conforming to the body.

[0034] Ideally, the first layer of fabric undergoes a fluorine-free water-repellent treatment, coating the fibers with a water-repellent agent to give the fabric durable waterproof properties. Huntsman's fluorine-free water-repellent agent is used at a dosage of 50 g / L, and the process is performed using a setting machine at 165℃. The resulting fabric has an initial water repellency of ≥4, and after 10 washes, the dried fabric exhibits a water repellency of ≥2, further enhancing its water-repellent and waterproof functions.

[0035] Example 2 (Control Example)

[0036] Fabric layer one uses a twill weave, such as 2 / 2, 1 / 1, or 2 / 1 twill. The warp yarns are non-elastic polyester untwisted yarn with a count of 75D, and the weft yarns are fine denier high-elastic polyester untwisted yarn with a count of 75D. The yarn's own crimp shrinkage rate is 32%, and the elongation of fabric layer one can reach 30%. Fabric layer two uses a knitted fabric, specifically 20D / 24F fine denier polyester 36-42 gauge knitted single-sided fabric, with a yarn weight of 20-30 grams and an elastic elongation of 30-55%. The membrane layer uses a 0.012mm-0.020mm thick high-transparency PU transparent film, with a single-film elastic elongation ≥140%, a single-film water pressure ≥10000mm, and a moisture permeability ≥8000g / m². 2 •h. Full bonding is used when bonding the membrane layer to the woven fabric layer one and to the knitted fabric layer two. A complete adhesive layer is formed between the membrane layer and fabric layer one, and between the membrane layer and fabric layer two. Hot melt adhesive is used as the bonding agent, with an application rate of 17-20 g / m². 2 The fabric is bonded using bonding rollers, resulting in a weft elongation of 9%-11% and poor elongation; the fabric's moisture permeability is <2500g / m². 2 • 24H (positive cup moisture absorption method), poor moisture permeability; water pressure resistance 4500-6000 mm, density 250-270 T / IN, weight 158-178 g / m³ 2 The finished fabric has reduced softness and smoothness, and feels stiff and rigid.

[0037] Ideally, the first layer of fabric undergoes a fluorine-free water-repellent treatment, coating the fibers with a water-repellent agent to give the fabric durable waterproof properties. Huntsman's fluorine-free water-repellent agent is used at a dosage of 50 g / L, and the process is performed using a setting machine at 165℃. The resulting fabric has an initial water repellency of ≥4, and after 10 washes, the dried fabric exhibits a water repellency of ≥2, further enhancing its water-repellent and waterproof functions.

[0038] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0039] Tables 1 and 2 below provide a comparison table of the fabrics of the present invention and their properties. For example, the adhesive dots with a coating weight of 12g have a diameter of 0.65mm, a depth of 0.1mm, and a distribution density of 730 dots / Inch2; the adhesive dots with a coating weight of 18g have a diameter of 0.65mm, a depth of 0.15mm, and a distribution density of 730 dots / Inch2.

[0040] Table 1:

[0041]

[0042] Table 2:

[0043]

Claims

1. A breathable and waterproof elastic fabric, characterized in that, The fabric comprises a fabric layer, a breathable membrane layer, and an adhesive layer. The fabric layer and the membrane layer are bonded together by adhesive dots to form the adhesive layer. The membrane layer is a PU membrane with a single membrane elastic elongation ≥100%. The fabric layer is an elastic fabric with a weft elongation ≥15% and the weft elongation of the fabric ≥8.0%. The fabric layer includes a first fabric layer and a second fabric layer, which are bonded to both sides of the membrane layer by adhesive dots. The first fabric layer is a woven fabric with non-elastic warp yarns, and the second fabric layer is a knitted fabric. The adhesive dots are located inside the second fabric layer and are covered by the yarns of the second fabric layer. The adhesive dots on the surface of the breathable membrane are exposed through the gaps in the second fabric layer, and bright spots formed by the adhesive can be seen through the gaps in the second fabric layer.

2. The breathable and waterproof elastic fabric as described in claim 1, characterized in that, The single-film elastic elongation is ≥140%, and the fabric layer elongation is ≥20%.

3. A breathable and waterproof elastic fabric as described in claim 1 or 2, characterized in that, The fabric has a moisture permeability of ≥3500g / ㎡·24H (GB / T 12704.1 positive cup moisture absorption method), and / or the fabric has a water pressure resistance of ≥5000mm, and / or the fabric has a weight of 150-180G / M².

4. The breathable and waterproof elastic fabric as described in claim 1, characterized in that, The coverage of the adhesive dots on the film layer is 30-50%; and / or the diameter of the adhesive dots is less than or equal to 0.65 mm and greater than or equal to 0.25 mm, the thickness is 0.07-0.12 mm, the center distance between the dots and grooves when the plane is unfolded is 0.998 mm, the error of the diameter, thickness and center distance of the adhesive dots is ±0.005 mm, and the amount of adhesive applied is 10g-20g.

5. The breathable and waterproof elastic fabric as described in claim 1, characterized in that, The membrane is a highly permeable PU transparent membrane with a thickness of 0.012mm-0.020mm; moisture permeability > 5000g / ㎡·24H; and water pressure resistance > 10000mm.

6. The breathable and waterproof elastic fabric as described in claim 1, characterized in that, The membrane layer is a microporous, highly permeable PU membrane with a thickness of 0.012mm-0.020mm, a single membrane elastic elongation of 142-210%, a membrane water pressure ≥ 10000mm, a moisture permeability ≥ 8000g / m²·24H, and 7 billion micropores / m² with a pore size of 0.1μmm.

7. The breathable and waterproof elastic fabric as described in claim 1, characterized in that, When it is a woven fabric, its weft elongation is 20-40%; when it is a knitted fabric, its weft elongation is 30-55%.

8. The breathable and waterproof elastic fabric as described in claim 7, characterized in that, The warp yarns are made of non-elastic polyester untwisted yarn with a count of 75-100D, and the weft yarns are made of fine denier high-elastic polyester untwisted yarn with a count of 75D-100D. The yarn's own crimp shrinkage rate is 32±3%. The second layer of fabric is a straight yarn knitted weft-knitted fabric or ribbed fabric, which is a 15-40D / 14-48F fine denier polyester 36-42 gauge knitted single-sided fabric with a yarn weight of 16-35 grams.

9. The breathable and waterproof elastic fabric as described in claim 7, characterized in that, The warp yarns are made of non-elastic polyester untwisted yarn with a count of 75-100D, and the weft yarns are made of fine denier high-elastic polyester untwisted yarn with a count of 75D-100D. The yarn's own crimp shrinkage rate is 32±3%. The second layer of fabric is a straight yarn knitted weft-knitted fabric or ribbed fabric, which is a 20-40D / 14-48F fine denier polyester 36-42 gauge knitted single-sided fabric with a yarn weight of 20-30 grams.

10. The breathable and waterproof elastic fabric as described in claim 7, characterized in that, The warp yarn is made of non-elastic polyester untwisted yarn with a count of 75-100D, and the weft yarn is made of fine denier high-elastic polyester untwisted yarn with a count of 75D-100D. The yarn's own crimp shrinkage rate is 32±3%. The second layer of fabric is made of 15D-30D single-sided knitted fabric with a weight of 16-35 g / m².

11. A method for preparing a breathable and waterproof elastic fabric, the fabric comprising a fabric layer and a membrane layer, wherein the fabric layer and the membrane layer are bonded together by adhesive dots, characterized in that... The fabric is prepared as follows: the fabric layer is an elastic fabric layer with an elasticity greater than or equal to 20%, and the membrane layer is a moisture-permeable PU membrane with a single membrane elastic elongation ≥140%, which is adapted to the elongation of the fabric layer. A bonding roller is used for bonding, so that the coverage of adhesive dots on the membrane layer is 30-50%, and the weft elongation of the obtained fabric is ≥8.0%. The adhesive dots are evenly distributed on the membrane layer. A double-layer fabric is used, namely fabric layer one and fabric layer two. Fabric layer one and fabric layer two are located on both sides of the membrane layer and are bonded together by adhesive dots. Fabric layer two is a knitted fabric, and fabric layer one is a woven fabric. The warp yarns are non-elastic yarns. The amount and pressure of adhesive are controlled so that the adhesive dots on the surface of the moisture-permeable membrane are exposed from the gaps of fabric layer two. The adhesive dots are located inside fabric layer two and are covered by the yarns of fabric layer two. The bright spots formed by the adhesive can be seen from the gaps of fabric layer two.

12. The method for preparing the breathable and waterproof elastic fabric as described in claim 11, characterized in that, A bonding roller with circular grooves is used. The diameter of the circular grooves is 0.65 mm and the depth is 0.1-0.23 mm. When unfolded, the center distance between the circular grooves is 0.998 mm. The amount of adhesive applied is 10-20 g. The adhesive is scraped across the surface of the roller by a scraper. The transfer rate of adhesive from the circular grooves to the film layer is 39%~40%. The film surface is covered with circular adhesive dots with gaps. The adhesive used is a moisture-permeable adhesive. The adhesive temperature is 90℃. The gap between the roller and the film layer is 0.07 mm. The bonding speed of the roller is 15 m / min to achieve an adhesive transfer rate of 39%~40%.

13. The method for preparing the breathable and waterproof elastic fabric as described in claim 11, characterized in that, Fabrics with an elongation of ≥30% are used as fabric layer one and fabric layer two. When the fabric is woven, the weft yarn is fine denier high-elastic untwisted yarn with a specification of 75D-100D and a yarn self-curling shrinkage rate of 32±3%. The warp yarn is fine denier untwisted yarn with a specification of 75D-100D. The warp yarn is untwisted and spot bonding is performed using a 2000+ / Inch² bonding roller. When the fabric is knitted, a 20-40D / 12-48F fine denier 36-42 gauge knitted single-sided fabric is used with a yarn weight of 20-30 grams. Spot bonding is performed using a 2000+ / Inch² bonding roller. During spot bonding, the adhesive dots are located between fabric layer one and the film layer, and between fabric layer two and the film layer. All yarns are polyester.

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