A double-layer fabric and a manufacturing method thereof

Abstract

The application discloses a double-layer fabric and a manufacturing method thereof, and belongs to the field of textiles. The method comprises the following steps: using warp and weft to weave surface tissue, using back warp and back weft to weave back tissue, and using weft guide threads to overlap the surface warp and the back warp; the guide threads are thinner than the surface weft and the back weft, the number of the surface weft and the back weft is 2 to 4 times the number of the guide threads, the guide threads contain 10% to 20% polyester-chiffon composite silk; the surface weft and the back weft are cotton yarn; after weaving, the cloth is subjected to alkali treatment. The guide threads for connecting the surface tissue and the back tissue are easily covered by other yarns, the guide threads are equivalent to an additional third weft, the connection strength is high, the surface tissue and the back tissue are not affected, after alkali treatment, the shrinkage of the surface tissue and the back tissue is reduced, the guide threads are shrunk, the covering effect of the guide threads is further enhanced, the strength of the guide threads is further increased, and the surface of the fabric is not easy to see the guide threads, and the surface tissue and the back tissue have high connection strength.

Description

Technical Field

[0001] This invention relates to a double-layer fabric and its manufacturing method, belonging to the field of textiles. Background Technology

[0002] Woven fabrics are made by interlacing multiple warp and weft yarns according to a specific weave structure. By changing the weave structure, different styles of fabrics can be made to meet different market demands. For example, traditional denim fabric is made by interlacing indigo-dyed warp yarns with off-white weft yarns in a twill weave structure, which gives the fabric a certain textured feel.

[0003] With economic development and improved living standards, consumers are no longer solely focused on the design of clothing; they are increasingly emphasizing the diverse wearing effects and functionality of garments. Designing fabrics with different structures or using new functional yarns can endow clothing with diverse styles and functions. In existing multi-layered weave structures, the upper and lower layers are connected by weave joints. However, to accommodate the original design of both layers, the number of joints that can be set is limited. A joint refers to the overlap between the weft yarn of the inner weave and the warp yarn of the outer weave, or vice versa. Typically, only 1 to 3 joints can be set in a minimum weave cycle. Too many joints can cause problems such as unclear weave openings and easy breakage during weaving, affecting fabric quality and reducing weaving efficiency. Too few joints result in less connection between upper and lower layers, making them more prone to tearing. Under these limitations, the connection methods for double-layer fabrics are very limited, and these connection methods still have shortcomings. For example, when double-layer fabrics in the prior art are connected top and bottom, the design of the joint point will disrupt the texture of the upper and lower layers of fabric, resulting in regular streaks or exposed white areas on the fabric, affecting the appearance of the fabric. In addition, the connection strength between the upper and lower layers of the fabric is low, resulting in insufficient overall strength of the fabric. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a double-layer fabric and its manufacturing method, which makes it difficult to see the joints on the surface of the fabric and the overall strength of the fabric is high.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] In a first aspect, this application provides a method for manufacturing a double-layer fabric, comprising the following steps: weaving an outer fabric using outer warp and outer weft, weaving an inner fabric using inner warp and inner weft, and using weft-directed guide yarns to overlap the outer warp and inner warp; the guide yarns are finer than the outer weft and inner weft, and the number of the outer weft and inner weft is 2 to 4 times the number of the guide yarns; the guide yarns contain 10%-20% polyester-nylon composite yarns; the outer weft and inner weft are cotton yarns; after weaving, the fabric is subjected to alkali treatment.

[0007] In the double-layer fabric manufacturing method provided in this application, a guide thread is used to connect the outer and inner fabrics. The guide thread is finer than both the outer and inner weft threads, and there are fewer guide threads, making them easily obscured by the outer and inner weft, outer and inner warp yarns. The guide thread is not easily visible on the front of the fabric. The guide thread is essentially an additional third weft yarn, thus resulting in higher connection strength without affecting the texture of either the outer or inner fabric. During the alkali treatment process, the wax in the cotton yarn is removed, causing the cotton fibers to swell and reducing the shrinkage rate of both the outer and inner fabrics. Simultaneously, the polyester-nylon composite yarn shrinks under the alkali treatment. Compared to the guide thread, the other yarns are relatively fluffy, further enhancing the concealment effect on the guide thread. Furthermore, the strength of the shrunken guide thread further increases. All these factors combined result in the guide thread being difficult to see on the fabric surface, leading to higher overall fabric strength. This connection method does not disrupt the texture of either the outer or inner fabric.

[0008] Furthermore, the number of threads of the lead thread is 3 to 8 times that of the outer weft and the inner weft, and the twist coefficient of the lead thread is 15%-30% higher than that of the outer weft and the inner weft.

[0009] The finer the lead yarn, the easier it is to be covered by other yarns, but the weaker the connection between the outer and inner weft structures. When the lead yarn count is 3 to 8 times that of the outer and inner weft, the coverage effect of the lead yarn is better, and the lead yarn has a certain strength. At the same time, the twist coefficient of the lead yarn is 15%-30% higher than that of the outer and inner weft, which can further improve the strength of the lead yarn. Yarns with high twist have a poor hand feel, but there are fewer lead yarns, and they are finer than the outer and inner wefts. Due to the shrinkage after alkali treatment, they are more tightly interwoven with the warp yarns than the outer and inner wefts, so it is difficult to touch the lead yarn when wearing the fabric. The lead yarn does not affect the hand feel of the fabric.

[0010] Furthermore, the number of strands of the lead wire is 30S-65S, and the twist coefficient of the lead wire is 4.5-5.5, which provides high strength and can provide greater strength when the fabric is torn, making the fabric less prone to tearing.

[0011] Furthermore, when the lead wire overlaps the outer warp, the number of warp weft points formed is not less than the number of weft weft points; when the lead wire overlaps the inner warp, the number of warp weft points formed is not less than the number of weft weft points.

[0012] When the lead thread forms a warp weave point with the outer and inner warps, the warp yarns are directly overlapped on the lead thread, which has the strongest covering effect on the lead thread. This ensures that the warp weave point formed by the lead thread is no less than the weft weave point, making it more difficult to detect the lead thread on the fabric surface.

[0013] Furthermore, at the point where the lead wire and the outer warp form a weft weft organization point, there is always an adjacent outer weft and the outer warp forming a weft weft organization point in the warp direction; at the point where the lead wire and the inner warp form a weft weft organization point, there is always an adjacent inner weft and the inner warp forming a weft weft organization point in the warp direction.

[0014] The lead thread is directly covered by the warp yarn at the warp weft ...

[0015] Furthermore, the alkali treatment step includes: treating the woven fabric with a sodium hydroxide solution of 5 g / L-10 g / L for 10 min-20 min at a temperature of 60℃-75℃;

[0016] Following the alkali treatment step, liquid ammonia finishing is also performed.

[0017] During alkali treatment, the alkali solution penetrates cotton yarn slowly. If the cotton yarn is fully swollen during alkali treatment, the outer layer of the yarn is easily damaged by the alkali solution. Liquid ammonia finishing can also make cotton yarn swell, with a fast penetration speed, without damaging the cotton fibers, and can also improve its abrasion resistance and tear strength. In the alkali treatment process, less time and lower temperature are used than conventional boiling, only meeting the shrinkage requirements of polyester-nylon composite yarns. The cotton yarn initially swells, and then liquid ammonia finishing is carried out to make the cotton yarn fully swollen, resulting in higher overall fabric strength.

[0018] Furthermore, between the alkali treatment and the liquid ammonia finishing steps, and after the liquid ammonia finishing step, the fabric is subjected to hot air beating at a temperature of 90℃-120℃. This can eliminate the internal stress of the cotton fibers, further reduce the shrinkage rate of the fabric, and keep the fabric in a stable dimension, preventing it from easily deforming.

[0019] Furthermore, the hot air beating is divided into four stages with a constant beating frequency. In the first stage, the hot air temperature is 120°C and the beating speed is 250 m / min; in the second stage, the hot air temperature is 110°C and the beating speed is 350 m / min; in the third stage, the hot air temperature is 100°C and the beating speed is 450 m / min; and in the fourth stage, the hot air temperature is 90°C and the beating speed is 550 m / min.

[0020] From the first to the fourth stage, the temperature of the beating decreases and the distance between beatings increases, which is equivalent to "annealing" the cotton fibers. This better eliminates the internal stress of the cotton fibers, which helps to reduce shrinkage and thus increase the strength of the fabric while keeping the fabric relatively soft.

[0021] Furthermore, prior to the alkali treatment step, there is also a step of double-sided singeing of the fabric.

[0022] Singeing can remove fuzz from the fabric surface and increase the penetration rate of alkali solution during alkali treatment.

[0023] Secondly, this application provides a double-layer fabric made by the manufacturing method described in the first aspect, wherein the surface and lining fabrics have a high bonding strength, and the texture designs that can be woven from the surface and lining fabrics are more diverse than those of double-layer fabrics in the prior art.

[0024] The beneficial effects of this invention are as follows: This invention utilizes guide threads to connect the outer and inner fabrics. The guide threads are finer than both the outer and inner weft threads, and there are fewer guide threads, making them easily obscured by the outer and inner weft, outer and inner warp yarns. The guide threads are not easily visible on the front of the fabric. The guide threads are essentially an additional third weft system, resulting in higher connection strength without affecting the texture of either the outer or inner fabric. After alkali treatment, most of the wax in the cotton yarn is removed, causing the cotton fibers to swell and reducing the shrinkage rate of both the outer and inner fabrics. Simultaneously, the polyester-nylon composite yarn shrinks under the action of alkali treatment. Compared to the guide threads, the other yarns are relatively fluffy, further enhancing the concealing effect on the guide threads. Furthermore, the strength of the shrunken guide threads is further increased. All these factors combined result in the guide threads being less visible on the fabric surface, and a strong connection between the outer and inner fabrics.

[0025] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0026] Figure 1 This is a minimum weave cycle diagram of a double-layer fabric provided in an embodiment of this application.

[0027] Figure 2 From Figure 1 The organizational structure diagram of the table obtained by splitting the middle.

[0028] Figure 3 From Figure 1 The organizational structure diagram obtained by splitting the middle part. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0031] Typical double-layer fabrics consist of an outer layer (upper layer) and an inner layer (lower layer). While sewing provides strong adhesion, the seams are clearly visible on the fabric surface and are not aesthetically pleasing. During weaving, the weft yarns of the inner layer overlap with the warp yarns of the outer layer, or vice versa, creating knots to secure the two layers. This method is more aesthetically pleasing than sewing, but still results in regular streaks or exposed areas. Furthermore, to preserve the natural texture of the outer and inner layers, only 1 to 3 knots can be placed in a minimum weave cycle. The bonding strength between the outer and inner layers is far lower than with sewing, making them prone to tearing.

[0032] This application provides a method for manufacturing a double-layer fabric, including the following steps:

[0033] Weaving: The outer fabric is woven using the outer warp and outer weft, and the inner fabric is woven using the inner warp and inner weft. The weft guide yarn overlaps with the outer and inner warp. The guide yarn is finer than the outer and inner weft yarns, and the number of outer and inner weft yarns is 2 to 4 times the number of guide yarns. The guide yarn contains 10%-20% polyester-nylon composite yarn. The outer and inner weft yarns are cotton yarns. After weaving, the fabric is treated with alkali.

[0034] This embodiment utilizes a guide thread to connect the outer and inner fabrics. The guide thread is finer than both the outer and inner weft threads, and its quantity is small, making it easily obscured by the outer and inner weft, warp, and other yarns. The guide thread is not easily visible on the front of the fabric. It acts as an additional third weft yarn, resulting in higher connection strength without affecting the texture of either the outer or inner fabric. During the alkali treatment, the wax in the cotton yarn is removed, causing the cotton fibers to swell and reducing the shrinkage rate of both the outer and inner fabrics. Simultaneously, the polyester-nylon composite yarn shrinks under the alkali treatment. Under these two effects, compared to the guide thread, the other yarns are relatively fluffy, with the guide thread tightly interwoven within the fabric, while the other yarns are mainly located on the fabric surface, further enhancing the concealment of the guide thread. Furthermore, the strength of the shrunken guide thread increases further, making it difficult to see the guide thread on the fabric surface. The overall strength of the fabric is high, and this connection method does not disrupt the texture of the outer and inner fabrics.

[0035] The outer and inner warp yarns can be cotton yarns, preferably cotton-spandex elastic yarns. After alkali treatment, the inner and outer weft yarns need to exhibit a more fluffy effect than the lead yarn to cover it. However, the outer and inner warp yarns can be directly stacked on the lead yarn and do not need to be more fluffy than the lead yarn. On the contrary, giving the warp yarns a certain degree of elasticity helps the warp direction of the fabric to be more resistant to stretching, which to a certain extent enhances the fabric's tear resistance. At the same time, under the elastic contraction of the warp direction, the lead yarn gets closer to other weft yarns, which is more conducive to the outer and inner weft yarns covering the lead yarn.

[0036] When the lead thread forms a warp weave point with the outer warp and inner warp, the warp yarns are directly overlapped on the lead thread, which has the strongest covering effect on the lead thread. Preferably, when the lead thread overlaps with the outer warp, the warp weave point formed is no less than the weft weave point; when the lead thread overlaps with the inner warp, the warp weave point formed is no less than the weft weave point, which makes it more difficult to find the lead thread on the fabric surface.

[0037] At the point where the lead thread forms a weft weave, it lies above the outer and inner warp threads, requiring concealment by the outer and inner weft threads. In the warp direction, if the weft weave points adjacent to the lead thread's formation are all warp weave points formed by other weft yarns (i.e., outer or inner weft), it's as if the warp yarns (outer or inner warp) are "lifting" the lead thread between the two other weft yarns. This makes the lead thread's weft weave point at that location quite conspicuous, hindering its visual concealment. Preferably, at the point where the lead thread forms a weft weave point with the outer warp, there is always an adjacent outer weft forming a weft weave point in the warp direction; similarly, at the point where the lead thread forms a weft weave point with the inner warp, there is always an adjacent inner weft forming a weft weave point in the warp direction. Ensuring that there are always weft weave points of other weft yarns near the lead thread's weft weave point allows the lead thread to be hidden beneath the outer or inner weft, achieving complete concealment.

[0038] Reference Figures 1 to 3 The capital letters "A", "B", "C", and "D" in the column indicator numbers represent the inner warp, and the capital letters "A", "B", "C", and "D" in the row indicator numbers represent the inner weft. The Arabic numerals "1", "2", "3", and "4" in the column indicator numbers represent the outer warp, and the Arabic numerals "1", "2", "3", and "4" in the row indicator numbers represent the outer weft. The lowercase letters "x" and "y" in the row indicator numbers represent the leader yarn. It can be seen that the number of outer weft yarns is the same as the number of inner weft yarns, both being twice the number of leader yarns. Leader yarns do not participate in forming the outer or inner weave, and since leader yarns are finer than other weft yarns, they do not affect the weave pattern of the outer and inner weaves. The weave patterns of the outer and inner weaves can each be plain weave, twill weave, or satin weave. Figure 2 and Figure 3 From Figure 1 The structure of the split processing is as follows: Figure 2 Figure 3 As can be seen, in this embodiment, both the surface and inner fabrics are plain weaves with alternating up and down sections.

[0039] For ease of description, organization points will be named "column number - row number" below; for example, the organization point in column B and row C will be called BC. Figure 1 In the diagram, the outer weave layer overlaps the inner weave layer. Therefore, points 1-D, 1-C, 1-B, 1-A, 2-D, 2-C, 2-B, 2-A, 3-D, 3-C, 3-B, 3-A, 4-D, 4-C, 4-B, and 4-A represent the warp yarns of the outer weave layer. These points are thus marked as warp weave points formed by the outer warp, which are never below the inner weft. Points A-1, B-1, C-1, D-1, A-2, B-2, C-2, D-2, A-3, B-3, C-3, D-3, A-4, B-4, C-4, and D-4 are all weft weave points, indicating that the inner warp is also not above the outer weft. 1-x, 2-x, 3-x, 1-y, 3-y, and 4-y are the warp weaving points formed by the front warp and the leader; 4-x and 2-y are the weft weaving points formed by the front warp and the leader; Bx and Dy are the warp weaving points formed by the inner warp and the leader; and Ax, Cx, Dx, Ay, By, and Cy are the weft weaving points formed by the inner warp and the leader. It can be seen that in a minimum weaving cycle, the number of times the leader interweaves with the front and inner warps is much greater than the 1 to 3 joints in the prior art, making the front and inner weaving connections strong.

[0040] At the same time, Figure 1 In the illustrated embodiment, along the warp direction, AB and A-3 are adjacent to Ax, both of which are weft weaving points; CB and C-3 are adjacent to Cx, both of which are weft weaving points; 4-3, adjacent to 4-x, is a weft weaving point; and D-3, adjacent to Dx, is a weft weaving point, all of which are conducive to concealing the lead wire. Figure 1 It is a minimal organization cycle diagram. If the first row is connected to the top of the y-th row, it can also be found that 2-y and By also have adjacent weft organization points.

[0041] The finer the lead yarn, the easier it is to be covered by other yarns, but the weaker the connection between the outer and inner weft structures. Preferably, the count of the lead yarn is 3 to 8 times that of the outer and inner weft, which provides better coverage and also gives the lead yarn a certain strength. In addition, the twist coefficient of the lead yarn is 15%-30% higher than that of the outer and inner weft, which further improves the strength of the lead yarn. Yarns with high twist have a poor hand feel, but they have fewer lead yarns and are finer than both the outer and inner wefts. Furthermore, due to shrinkage after alkali treatment, they interweave more tightly with the warp yarns than the outer and inner wefts, making it difficult to touch the lead yarn when wearing the fabric. The lead yarn does not affect the hand feel of the fabric.

[0042] Specifically, the lead thread has a count of 30S-65S and a twist coefficient of 4.5-5.5, which provides high strength and can provide greater strength when the fabric is torn, making the fabric less prone to tearing.

[0043] In some embodiments, the steps of the double-layer fabric manufacturing method include: weaving - alkali treatment - liquid ammonia finishing. The alkali treatment process requires treating the woven fabric blank with a 5g / L-10g / L sodium hydroxide solution for 10-20 minutes at a temperature of 60℃-75℃.

[0044] During alkali treatment, the alkali solution penetrates cotton yarn slowly. If the cotton yarn is fully swollen during alkali treatment, the outer layer of the yarn is easily damaged by the alkali solution. Liquid ammonia finishing can also swell cotton yarn, with a fast penetration speed, without damaging the cotton fibers, and can also improve its abrasion resistance and tear strength. In the embodiments of this application, a shorter time and lower temperature are used in the alkali treatment process than conventional boiling (conventional boiling is 90℃-95℃, about 60 minutes), only meeting the shrinkage requirements of the polyester-nylon composite yarn. The cotton yarn initially swells, and then liquid ammonia finishing is performed to fully swell the cotton yarn, resulting in higher overall fabric strength.

[0045] In some embodiments, the steps of the double-layer fabric manufacturing method include: weaving - alkali treatment - hot air beating - liquid ammonia finishing - hot air beating. The hot air temperature during hot air beating is 90℃-120℃, which can eliminate the internal stress of cotton fibers, further reduce the fabric's shrinkage rate, and maintain stable fabric dimensions, preventing easy deformation.

[0046] Preferably, the hot air beating process is divided into four stages with a constant beating frequency. In the first stage, the hot air temperature is 120℃ and the beating speed is 250 m / min; in the second stage, the hot air temperature is 110℃ and the beating speed is 350 m / min; in the third stage, the hot air temperature is 100℃ and the beating speed is 450 m / min; and in the fourth stage, the hot air temperature is 90℃ and the beating speed is 550 m / min. From the first to the fourth stage, the beating temperature decreases and the beating intervals increase, which is equivalent to "annealing" the cotton fibers. This better eliminates the internal stress of the cotton fibers, which helps to reduce shrinkage and thus increase fabric strength while maintaining relative fabric softness. It also helps to break down the irregular cohesion between fibers to a certain extent, resulting in a smoother fabric and increased strength.

[0047] In some embodiments, the steps of the double-layer fabric manufacturing method include: weaving, singeing, alkali treatment, hot air beating, liquid ammonia finishing, and hot air beating. The singeing treatment specifically involves singeing both sides of the fabric blank on a singeing machine at a flame temperature of 300℃-500℃ and a machine speed of 70 m / min-80 m / min. Singeing removes fiber fuzz from the fabric surface, resulting in a relatively clean and neat fabric surface, and also increases the penetration rate of the alkali solution during alkali treatment.

[0048] Implementation Cases

[0049] The warp yarn is blue 16S cotton-spandex elastic yarn; both the outer and inner weft yarns are red 16S cotton yarn with a twist coefficient of 4.0; the lead yarn is white, containing 20% ​​polyester-nylon composite yarn and 80% cotton fiber, with a count of 60S and a twist coefficient of 4.8. Figure 1 The fabric is woven with a specific structure, and after weaving, it undergoes singeing, alkali treatment, hot air beating, liquid ammonia finishing, and hot air beating to obtain a double-layer fabric. The alkali treatment process requires treating the woven fabric with a 5g / L sodium hydroxide solution for 10 minutes at a temperature of 70℃. No white spots were observed on the front side of the fabric, and no white spots were observed after weft stretching, but sporadic white spots were visible after warp stretching. The seam performance was tested according to the 9.2 seam performance test method in GB / T 21294-2014, and the weft tear degree of the fabric was measured to be 0.24cm.

[0050] Comparison Cases

[0051] The warp yarn is blue 16S cotton-spandex elastic yarn; both the outer and inner weft yarns are red 16S cotton yarn with a twist coefficient of 4.0. The outer weave is a plain weave with one top and one bottom stitch, and the inner weave is also a plain weave with one top and one bottom stitch. The connection points are formed using a "bottom-to-top" method, meaning the inner warp is lifted and interlaced with the outer weft, resulting in two connection points within a minimum weave cycle. After weaving, the fabric undergoes singeing and dewaxing to obtain a double-layer fabric. The dewaxing process requires treating the woven fabric with a 5g / L sodium hydroxide solution for 30 minutes at a temperature of 90℃. Regular white stripes are observed on the front of the fabric, remaining visible regardless of whether the warp or weft is stretched. Testing was conducted according to the seam performance test method 9.2 in GB / T 21294-2014, and the weft tear degree of the fabric was measured to be 0.61cm.

[0052] Therefore, the embodiments of this application can solve the problem of regular streaks appearing in double-layer fabrics, and the outer and inner fabrics are more tightly connected, resulting in stronger resistance to tearing.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for manufacturing a double-layer fabric, characterized in that, Includes the following steps: The outer weave is created using outer warp and outer weft, and the inner weave is created using inner warp and inner weft. A weft guide thread overlaps the outer and inner warp threads vertically. The guide thread is finer than the outer and inner weft threads, and the number of outer and inner weft threads is 2 to 4 times the number of guide threads. The guide thread contains 10%-20% polyester-nylon composite yarn. The outer and inner weft threads are cotton yarn. After weaving, the fabric is treated with alkali. The alkaline treatment step includes: treating the woven fabric with a sodium hydroxide solution of 5 g / L-10 g / L for 10 min-20 min at a temperature of 60℃-75℃; Following the alkali treatment step, liquid ammonia finishing is also performed; When the lead wire overlaps the outer warp, the number of warp weft points formed is not less than the number of weft weft points; when the lead wire overlaps the inner warp, the number of warp weft points formed is not less than the number of weft weft points.

2. The method for manufacturing double-layer fabric according to claim 1, characterized in that, The number of threads of the lead thread is 3 to 8 times that of the outer weft and the inner weft, and the twist coefficient of the lead thread is 15%-30% higher than that of the outer weft and the inner weft.

3. The method for manufacturing double-layer fabric according to claim 2, characterized in that, The number of strands in the lead wire is 30S-65S, and the twist coefficient of the lead wire is 4.5-5.

5.

4. The method for manufacturing double-layer fabric according to claim 1, characterized in that, At the point where the lead wire and the outer warp form a weft weft organization point, there is always an adjacent outer weft and the outer warp forming a weft weft organization point in the warp direction; at the point where the lead wire and the inner warp form a weft weft organization point, there is always an adjacent inner weft and the inner warp forming a weft weft organization point in the warp direction.

5. The method for manufacturing double-layer fabric according to claim 1, characterized in that, Between the alkali treatment and the liquid ammonia finishing steps, and after the liquid ammonia finishing step, the fabric is subjected to hot air beating at a temperature of 90℃-120℃.

6. The method for manufacturing double-layer fabric according to claim 5, characterized in that, The hot air beating process is divided into four stages with a constant beating frequency. In the first stage, the hot air temperature is 120℃ and the beating speed is 250m / min; in the second stage, the hot air temperature is 110℃ and the beating speed is 350m / min; in the third stage, the hot air temperature is 100℃ and the beating speed is 450m / min; and in the fourth stage, the hot air temperature is 90℃ and the beating speed is 550m / min.

7. The method for manufacturing double-layer fabric according to claim 1, characterized in that, Prior to the alkali treatment step, there is also a step of double-sided singeing of the fabric.

8. A double-layer fabric, characterized in that, Made by the manufacturing method according to any one of claims 1 to 7.

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