Rib fleece denim fabric having heat retaining property and comfortable property, and manufacturing method thereof

Abstract

To provide a rib fleece denim fabric having heat retaining property and comfortable property, and also to provide a manufacturing method thereof.SOLUTION: A rib fleece denim fabric according to an embodiment includes two warp systems and two weft systems. The warp system is divided into a front warp and a rear warp. The weft is divided into a front weft and a rear weft. The front weft and the rear weft are interwoven with the rear warp by plain weaving. The front warp and the front weft are interwoven by twill weaving. The front warp and the rear weft are not interwoven. The rear weft is thicker than the front weft. The rear weft is multifilament. A napped layer is provided on a bottom of the fabric. The fabric is tightened by shrinkage of the front weft, which causes the front weft to be pulled into the fabric so that the rear weft expands and protrudes downward and covers the front weft. Consequently, damage to the front warp and the front weft due to napping is small. Plain weaving structure makes an undermost layer of the woven fabric more dense. As the front weft tightens the fabric, the fabric is reinforced.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a ribbed fleece denim fabric with warmth and comfort, and a manufacturing method thereof, which belongs to the field of spinning. [Background technology]

[0002] Traditional denim fabrics are made of a twill weave, interwoven with pure cotton warp yarns dyed with indigo dye and white weft yarns, and the dense twill weave creates a retro style that is popular with people. By utilizing the properties of indigo dye itself, denim clothing is manufactured, and when it is washed, some of the indigo dye in the fibers is removed, so that such denim clothing has a variety of antique styles and has become an irreplaceable and important part of the clothing market.

[0003] Conventional denim clothing is relatively thick, but its heat retention is not satisfactory. Therefore, engineers have developed various denim fabrics with heat retention properties. For example, by weaving denim fabrics using heat-generating yarns as the weft, functional effects such as far-infrared radiation and heat generation are imparted to the fabric. While these effects persist even after prolonged use, the heat retention properties are unclear. In another example, engineers have developed composite denim fabrics in which denim fabric and fluff are bonded with adhesive, creating a fluff layer on the bottom surface of the denim fabric. However, this composite denim fabric becomes stiff due to adhesive degradation over time. Furthermore, the viscosity of the deteriorated adhesive decreases, causing fluff to fall off during washing, which then intertwines with the remaining fluff, resulting in wavy swelling and affecting comfort.

[0004] Some engineers design denim fabrics as double-layered fabrics. In such double-layered fabrics, the front weft and back warp yarns intertwine to form a junction, the back weft yarns form floats on the bottom, and the bottom of the fabric is subjected to a napping process, resulting in a layer of fuzz on the bottom of the fabric. However, since the fuzz is mainly produced by cutting and pulling out the floats, it is sufficiently long but not dense enough, and when the fabric is stretched, the fuzz becomes very sparse. Furthermore, after the fuzz is generated by the napping process, it is pulled out from the back weft yarns as well as from many parts of the front weft and back warp yarns, resulting in a significant decrease in the strength of the fabric. Summary of the Invention [Problem to be solved by the invention]

[0005] To solve the drawbacks of the prior art, the present invention provides a ribbed fleece denim fabric that is strong, has dense fluff even when stretched, and provides a heat-retaining effect for a long period of time, and is comfortable, and a manufacturing method thereof. [Means for solving the problem]

[0006] The technical solutions adopted by the present invention to solve the technical problems are as follows: In a first aspect, the present application provides a method for manufacturing a pharmaceutical composition comprising: A ribbed fleece denim fabric with a napped layer on the bottom surface for warmth and comfort, Provided is a ribbed fleece denim fabric with heat retention and comfort, which includes two warp systems and two weft systems, the warps being divided into front warps and back warps, the wefts being divided into front wefts and back wefts, the front wefts and back wefts being interwoven with the back warp in a plain weave, the front warp and the front wefts being interwoven in a twill weave, the front warp and the back wefts being uninterwoven, the back wefts being thicker than the front wefts, the back wefts being multifilament, and the shrinkage rate of the front wefts being greater than that of the back wefts.

[0007] The ribbed fleece denim fabric of the present invention, which is warm and comfortable, uses a thick multifilament as the back weft instead of forming floats on the bottom surface, and combines it with a front weft with a high shrinkage rate.As the front weft shrinks and tightens the fabric, the front weft is pulled into the fabric, and the thick back weft expands and protrudes downward, covering the front weft.The napped brushed layer is mainly due to the back weft, and the process of forming the napped brushed layer causes little damage to the front warp and front weft.In addition, the front weft and back weft are plain woven and interwoven with the back warp, making the bottom layer of the fabric denser.Furthermore, the front weft tightens the fabric, making the fabric stronger overall. Furthermore, since the bottom surface of the fabric is plain woven, the raising does not depend on floats, and the back weft yarn is a thick multifilament, the napped raised layer has short, numerous fibers that are very densely packed, making it comfortable to wear against the skin.Short fibers make the fibers less likely to tangle and cause swelling.When the fabric is stretched within a certain range, the swelling of the back weft yarn from the bottom surface only becomes smaller, so the fibers do not become significantly sparse.

[0008] In a preferred spun implementation, the face warp yarns and the face weft yarns are interwoven in a 3 / 1 twill weave, which gives the fabric a denim-like texture on the surface.

[0009] In a preferred spinning implementation, the front warp yarns are thicker than the back warp yarns, so that the front warp yarns can shield the back warp yarns at the front of the fabric.

[0010] Furthermore, the count of the back warp yarns is at least three times the count of the front warp yarns, which is advantageous for exposing the twill weave on the front side of the fabric and hiding the plain weave at the bottom of the fabric.

[0011] Furthermore, the count of the back warp is 3 to 8 times the count of the front warp.

[0012] Furthermore, the count of the face warp is 8S to 32S.

[0013] In a preferred spinning implementation, the F number of the back weft yarn is 114F to 900F. The F number, also known as the strand number, is used to indicate how many single fibers a chemical fiber multifilament is made up of. In the back weft yarn with a high F number, more fluff is formed by napping, which, in combination with the plain weave structure, keeps the fluff short and abundant, so it does not become significantly thinner even when the fabric is stretched.

[0014] Furthermore, the denier of a single fiber of the back weft is 80 D to 500 D. Napping forms fine, soft fluff, improving the comfort of the fabric when it comes into contact with the skin.

[0015] Furthermore, the count of the front weft is 21S to 60S. This contributes to a high F number while ensuring sufficient shrinkage by the front weft, and the back weft with a large denier shields the front weft at the bottom of the fabric.

[0016] In a preferred spinning implementation, the same back warp yarns have the same knuckle type with each of the front weft yarns, the same back warp yarns have the same knuckle type with each of the back weft yarns, and the same back warp yarns have the opposite knuckle type formed by the front weft yarns and the back weft yarns, so that the bottom surface of the fabric without napping has a poplin-like rib, and the fabric has excellent stability, and when a napping brushed layer is formed, the heat retention effect is further improved.

[0017] In a second aspect, the present application provides a method for producing a ribbed fleece denim fabric with warmth and comfort, comprising a weaving step and a finishing step, In the weaving step, two warp systems and two weft systems are used, the warp is divided into front warp and back warp, the weft is divided into front weft and back weft, the front weft and back weft are interwoven with the back warp in a plain weave, the front warp and front weft are interwoven in a twill weave, the front warp and back weft are not interwoven, the back weft is thicker than the front weft, the back weft is multifilament, the shrinkage rate of the front weft is greater than that of the back weft, and the front weft is a polyester-nylon composite yarn; The manufacturing method provides that the finishing step includes a singeing step, an alkali treatment step, a drying step, a shrink-proofing step, and a napping step in this order.

[0018] The front weft is a polyester-nylon composite yarn that shrinks severely when treated with alkali, allowing the fabric to be more densely interwoven and improving its tear resistance to a certain extent. Furthermore, when the front weft shrinks, the weft knuckles formed by the back weft on the bottom surface swell and protrude downward, being napped first to protect the back warp and front weft, thereby solving the problem of the fabric strength being significantly reduced by the napping process in conventional napping products.

[0019] Optionally, the selection and interweaving of each yarn may be performed as described in the first embodiment, and the fabric structure design and yarn combination further improves the tear resistance of the fabric.

[0020] Optionally, between the alkali treatment step and the drying step, a stirring washing step is further included, the treatment temperature being 40°C to 50°C and the treatment time being 20 minutes to 30 minutes, Between the drying step and the shrink-proofing step, a setting step of setting at a temperature of 150° C. to 170° C. and a speed of 20 m / min to 40 m / min is further included.

[0021] First, alkali treatment significantly shrinks the surface weft yarns, making the fabric denser and improving the fabric strength to a certain extent. Furthermore, agitation washing releases the stress between the cotton warp fibers, reducing the warp shrinkage rate and making the surface yarns of the fabric denser. Furthermore, setting treatment structurally changes the chemical fibers used as the weft yarns through prolonged heat treatment, thereby improving the fabric stability and helping to prevent a decrease in fabric strength due to napping.

[0022] Optionally, the singeing temperature is 250°C to 350°C, the speed is 75m / min to 85m / min, and singeing is performed only on the front side of the process. Singeing on one side at a low temperature and high speed is advantageous in reducing damage caused by singeing to chemical fibers, especially multifilaments in the back layer of the fabric. [Effects of the Invention]

[0023] The beneficial effects of the present invention are as follows: In the warmth-retaining and comfortable rib fleece denim fabric of the present invention, the front weft yarn contracts and tightens the fabric, drawing the front weft yarn into the fabric, causing the weft knuckles of the thick back weft yarn to bulge and protrude downward, covering the front weft yarn. The process of forming the napped layer causes minimal damage to the front warp and front weft yarns. Furthermore, because the front weft yarns and back weft yarns are plain woven and interwoven with the back warp yarns, the bottom layer of the fabric becomes denser. Furthermore, because the bottom surface of the fabric is plain woven, the nap generation does not rely on floats, and the back weft yarn is thick multifilament, the napped layer has short, numerous, and very dense fibers, providing excellent comfort when in contact with the skin. When the fabric is stretched to a certain extent, the back weft yarns only bulge less from the bottom surface, preventing the fibers from becoming significantly sparser.

[0024] Other features and advantages of the present application will be set forth in the following specification, and in part will be obvious, or may be learned by the practice of the present application. The objectives and other advantages of the present application may be achieved and obtained by the structure particularly pointed out in the written specification and drawings. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic diagram of the structure of a ribbed fleece denim fabric having heat retention and comfort according to an embodiment of the present application. [Figure 2] FIG. 1 is a schematic diagram of the structure of a rib fleece denim fabric having heat retention and comfort according to an embodiment of the present application. [Figure 3] FIG. 1 is a schematic diagram of the structure of a fabric formed by back warp yarns and front weft yarns. [Figure 4] FIG. 2 is a schematic diagram of the structure of a fabric formed by rear warp yarns and rear weft yarns. [Figure 5] FIG. 1 is a schematic diagram of the structure of a weave formed by front warp yarns and front weft yarns. [Figure 6] FIG. 1 is a schematic diagram of the structure of a weave formed by front warp yarns and back weft yarns. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, embodiments of the present invention will be described in detail, and examples of the embodiments are shown in the drawings, where the same or similar reference numerals throughout the drawings indicate the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0027] The following disclosure provides many different embodiments or examples for realizing different structures of the present invention. Hereinafter, in order to simplify the disclosure of the present invention, specific components and configurations will be described. Of course, these are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and / or characters in different examples, and this repetition is for the sake of brevity and clarity and does not itself indicate a relationship between the various embodiments and / or configurations being discussed.

[0028] Rib fleece denim fabric is a denim fabric that has a layer of nap on the bottom surface of the fabric.

[0029] The shrinkage rate of a thread refers to the rate at which the length of the thread shrinks when subjected to a certain external force.

[0030] Regarding the units of thread count, S stands for English count, which is the number of yards that is the length of thread weighing 1 pound at the standard moisture content. D stands for denier, a method of expressing the fineness of synthetic fibers, and is the weight in grams of a 9,000 meter length of silk at the standard moisture content. Referring to FIG. 1 , an embodiment of the present application provides a rib fleece denim fabric with warmth and comfort, which includes two warp systems and two weft systems, the warp yarns being divided into front warp yarns 10 and back warp yarns 30, the weft yarns being divided into front weft yarns 20 and back weft yarns 40, the front weft yarns 20 and back weft yarns 40 being interwoven with the back warp yarns 30 in a plain weave, the front warp yarns 10 and front weft yarns 20 being interwoven in a twill weave, the front warp yarns 10 and back weft yarns 40 being uninterwoven, the back weft yarns 40 being thicker than the front weft yarns 20, the back weft yarns 40 being multifilament, and the shrinkage rate of the front weft yarns 20 being greater than that of the back weft yarns 40. Here, the front warp yarns 10 and the front weft yarns 20 are interwoven to form the front layer of the fabric, the back warp yarns 30 and the back weft yarns 40 are interwoven to form the bottom layer of the fabric, and the bottom surface of the bottom layer is subjected to a napping treatment to obtain a napped raised layer 50.

[0031] In the examples of the present application, a new weaving structure and yarn arrangement allow the back weft to cover more of the bottom layer of the fabric, and the napping process forms a layer of fluff on the bottom surface, resulting in excellent warmth and comfort. Specifically, the fabric that has undergone napping has high strength and densely packed fluff, and the fluff does not become significantly sparse even when the fabric is stretched.

[0032] The principle behind why fabric that has been napped remains strong is as follows. (1) In the prior art, napped fabrics usually have many floats formed on the bottom surface of the fabric, resulting in fewer interwoven back wefts and warps. In the examples of the present application, the front weft 20 and back weft 40 are plain woven and interwoven with the back warp 30, resulting in more interwoven points and a denser fabric structure. (2) The surface weft thread 20 tightens the fabric. (3) The back weft thread 40 is thicker than the front weft thread 20, and the shrinkage rate of the front weft thread 20 is greater than that of the back weft thread 40. The front weft thread 20 is pulled into the interior of the fabric (the center of the front layer and the bottom layer), and the thick back weft thread 40 swells and protrudes downward (to the bottom surface), covering the front weft thread 20. Therefore, it is the back weft thread 40 that is mainly damaged by napping. (4) The back weft yarn 40 is a multifilament, and even if a single fiber is partially broken due to napping, the strength of the bottom layer is maintained by the plurality of single fibers.

[0033] The pile is densely packed and does not become significantly thinner when the fabric is stretched. The principle is as follows. (1) In the prior art, napped fabrics usually have many floats formed on the bottom surface of the fabric, and the naps formed are long and sparse. In the present embodiment, the front weft yarn 20 and the back weft yarn 40 are interwoven with the back warp yarn 30 in a plain weave, and the naps formed are short and plentiful. (2) The back weft yarn 40 is a multifilament containing a plurality of cuttable single fibers. (3) The shrinkage rate of the front weft 20 is greater than that of the back weft 40, and there is a merge to stretch the fabric. When the fabric is stretched within a certain range, the bulge of the back weft 40 from the bottom surface only becomes smaller, so the fuzz does not become significantly sparse.

[0034] The embodiment shown in Figure 2 illustrates the weaving structure of a rib fleece denim fabric with warmth and comfort in one specific embodiment. In Figures 2 to 6, the numbers of the front warp yarns are represented by Arabic numerals, the numbers of the back warp yarns are represented by Roman numerals, the numbers of the back weft yarns are represented by uppercase letters, and the numbers of the weft yarns are represented by lowercase letters. According to the drawing conventions in this field, hatched grids represent warp knuckles (as viewed from the front of the process), and unhatched grids represent weft knuckles (as viewed from the front of the process). For example, the point where the weft yarn in row D and the warp yarn in column II intertwine is the warp knuckle formed by the back weft yarn and the back warp yarn, and this point is the weft knuckle when viewed from the back of the process.

[0035] The weave structure formed by the back warp and front weft yarns in Figure 2 is shown in Figure 3, the weave structure formed by the back warp and back weft yarns in Figure 2 is shown in Figure 4, the weave structure formed by the front warp and front weft yarns in Figure 2 is shown in Figure 5, and the weave structure formed by the front warp and back weft yarns in Figure 2 is shown in Figure 6. As can be seen from Figure 6, all are warp knuckles, i.e., the front warp yarns all "overlap" the back weft yarns and the front warp and back weft yarns are not interlaced, which corresponds to Figure 1 where all of the back weft yarns 40 are underneath the front warp yarns 10.

[0036] As shown in Figure 5, the front warp yarns 10 and the front weft yarns 20 are interwoven in a 3 / 1 twill weave, giving the surface of the fabric a denim-like texture. Specifically, the front and back warp yarns may all be pure cotton warp yarns dyed with indigo or sulfur black, thereby preventing the white color of the bottom layer from being visible from the front of the fabric.

[0037] Furthermore, the threads may be arranged so that the white color of the bottom layer is not visible from the front of the fabric. For example, the front warp threads 10 are thicker than the back warp threads 30, so that the front warp threads shield the back warp threads on the front of the fabric. Specifically, the count of the back warp threads 30 is three or more times that of the front warp threads 10, which is advantageous in that the front of the fabric is twill weave and the plain weave of the bottom layer of the fabric is not exposed. More preferably, the count of the back warp threads 30 is three to eight times that of the front warp threads 10. Furthermore, the count of the front warp threads 10 is 8S to 32S, so that the front warp threads exhibit the texture and effect of a normal denim fabric surface.

[0038] Multifilaments contain multiple single fibers, and the F number represents the number of single fibers contained in one multifilament. Preferably, the F number of the back weft yarn 40 is 114F to 900F. Back weft yarns with a high F number form a lot of fuzz through napping, which works well with the plain weave structure, and the short, abundant fuzz does not become significantly sparse even when the fabric is stretched. More preferably, the back weft yarn 40 has a single fiber denier of 80D to 500D, which forms fine, soft fuzz through napping, improving comfort when the fabric comes into contact with the skin. Therefore, the front weft yarn 20 has a count of 21S to 60S, and can be reliably shielded with multifilaments of 80D to 500D and 114F to 900F.

[0039] The front weft is used to connect the front and back layers of the fabric, and when arranging the threads, making the front weft slightly thinner than the front warp is advantageous in that it makes it difficult to see the bottom layer of the fabric from the front of the fabric process. Specifically, the front weft can be a polyester-nylon composite thread, and once the denim fabric is washed, the shrinkage effect of the front weft will be improved. Of course, the front weft can also be other threads with high shrinkage.

[0040] Preferably, referring to Figures 3 and 4, the same back warp yarns 30 have the same type of knuckle with each front weft yarn 20, the same back warp yarns 30 have the same type of knuckle with each back weft yarn 40, and for the same back warp yarns 30, the type of knuckle formed by the front weft yarn 20 and the type of knuckle formed by the back weft yarn 40 are opposite.

[0041] 3 and 4, a single back warp appears not to interweave with a weft. However, for the same back warp 30, the type of knuckle formed by the front weft 20 is opposite to the type of knuckle formed by the back weft 40. The front weft and front warp are interwoven in a twill weave, resulting in a stable fabric structure that does not loosen. The same back warp 30 has the same type of knuckle with each front weft 20, and the same back warp 30 has the same type of knuckle with each back weft 40. Therefore, when the front weft contracts, the back weft is pulled downward, causing a poplin-like rib to form on the bottom of the fabric without napping, providing a poplin-like warmth. Furthermore, the napped layer 50 formed by napping provides even greater warmth.

[0042] An embodiment of the present application also provides a method for manufacturing a ribbed fleece denim fabric with warmth and comfort, comprising a weaving step and a finishing step, wherein the weaving step uses two warp systems and two weft systems, the warp is divided into a front warp and a back warp, the weft is divided into a front weft and a back weft, the front weft and the back weft are interwoven with the back warp in a plain weave, the front warp and the front weft are interwoven in a twill weave, the front warp and the back weft are not interwoven, the back weft is thicker than the front weft, the back weft is multifilament, the shrinkage rate of the front weft is greater than that of the back weft, and the front weft is a polyester-nylon composite yarn, The finishing process includes a singeing step, an alkali treatment step, a drying step, a shrink-proofing step, and a napping step in this order, and provides a method for producing a ribbed fleece denim fabric having heat retention and comfort.

[0043] The front weft is a polyester-nylon composite yarn that shrinks severely when treated with alkali, allowing the fabric to be more densely interwoven and improving its tear resistance to a certain extent. Furthermore, when the front weft shrinks, the weft knuckles formed by the back weft on the bottom surface swell and protrude downward, and are first subjected to napping, protecting the back warp and front weft with the downward protrusion of the back weft, thereby minimizing damage and solving the problem of the fabric strength being significantly reduced by the napping process in conventional napping products.

[0044] The polyester-nylon composite yarn is a commercially available common polyester-nylon composite yarn, and may be, for example, 60% polyester + 40% nylon, 42.9% polyester + 57.1% nylon, 50% polyester + 50% nylon, or 66.7% polyester + 33.3% nylon. The remaining yarn composition may refer to the example of the warm and comfortable ribbed fleece denim fabric described above. The drying process involves a drying temperature of 100°C to 120°C and a processing time of 5 to 10 minutes.

[0045] Specifically, the singeing temperature is 250°C to 350°C, the speed is 75m / min to 85m / min, and the singeing is performed only on the front side of the process. Singeing is used to remove fuzz from the surface of the fabric. In the embodiment of the present application, singeing on one side at a low temperature and high speed is advantageous in reducing the damage caused by singeing to chemical fibers, especially multifilaments in the back layer of the fabric.

[0046] Preferably, an agitation washing step is further included between the alkali treatment step and the drying step, with the treatment temperature being 40°C to 50°C and the treatment time being 20 minutes to 30 minutes, Between the drying step and the shrink-proofing step, a setting step is further included at a setting temperature of 150°C to 170°C and a speed of 20 m / min to 40 m / min.

[0047] In the agitation washing process, the fabric is kept in its natural state without being pulled or subjected to other forces, and the fabric is washed under low tension, so that the internal stress between the cotton fibers of the weft yarn is eliminated, the fabric shrinks relatively, the fabric becomes relatively dense, and the warp knuckles on the bottom surface of the back warp yarn fabric protrude more.

[0048] Example 1 The fabric was woven according to the weave structure shown in Figure 2, using 10S pure cotton yarn as the front warp, 30S pure cotton yarn as the back warp, 75D polyester-nylon composite yarn (50% polyester + 50% nylon) as the front weft, and 300D nylon with an F number of 536 as the back weft. The fabric was removed from the machine and finished. The finishing process was as follows: singeing on the front side: temperature 300°C, speed 85 m / min; alkali treatment: sodium hydroxide concentration 12 g / L; drying: temperature 100°C, time 8 min; shrink prevention using conventional methods; and napping on the bottom side of the fabric to form a napped layer. The breaking strength of the fabric was measured according to GB / T 3923.1-2013 Textiles - Tensile Properties of Woven Fabrics - Part 1: Determination of Breaking Strength and Breaking Elongation (Strip Method). The breaking strength of the resulting fabric was 723 N. The thermal insulation rate of the fabric was measured in accordance with GB / T 35762-2017 Test method for heat transfer performance of textile products - Plate method, and the thermal insulation rate was found to be 33.6%.

[0049] Example 2 The fabric was woven according to the weave structure shown in Figure 2, using 10S pure cotton yarn as the front warp, 30S pure cotton yarn as the back warp, 75D polyester-nylon composite yarn (50% polyester + 50% nylon) as the front weft, and 300D nylon with an F number of 536 as the back weft. The fabric was removed from the machine and finished. The finishing sequence was as follows: singeing on the front side: temperature 300°C, speed 85 m / min; alkali treatment: sodium hydroxide concentration 12 g / L; agitation washing: treatment temperature 50°C, treatment time 20 min; drying: temperature 100°C, time 8 min; setting: temperature 150°C, speed 40 m / min; shrink prevention using the usual method; and napping on the bottom side of the fabric to form a napped layer. The breaking strength of the fabric was measured according to GB / T 3923.1-2013 Textiles - Tensile Properties of Woven Fabrics - Part 1: Determination of Breaking Strength and Breaking Elongation - Strip Method. The breaking strength of the resulting fabric was 741 N. The heat retention rate of the fabric was measured in accordance with GB / T 35762-2017 Test method for heat transfer performance of textile products (flat plate method), and the heat retention rate was 34.2%.

[0050] Comparative Example 1 The fabric was made using 10S pure cotton yarn for the front warp, 30S pure cotton yarn for the back warp, 10S pure cotton yarn for the front weft, and 10S pure cotton yarn for the back weft. The fabric was woven using a 3 / 1 twill weave for the front layer and a 5 / 3 satin weave for the back layer, with the joint point being the connection point between the back warp and the front weft. The fabric was removed from the machine and finished. The finishing process was as follows: one-sided singeing at 500°C and a speed of 60 m / min; shrink-proofing using conventional methods; and napping on the bottom surface of the fabric to form a napped layer. The breaking strength of the fabric was measured in accordance with GB / T 3923.1-2013 Textiles - Tensile Properties of Woven Fabrics - Part 1: Determination of Breaking Strength and Breaking Elongation - Strip Method. The breaking strength of the resulting fabric was 389 N. The thermal insulation rate of the fabric was measured in accordance with GB / T 35762-2017 Test method for heat transfer performance of textile products - flat plate method, and the thermal insulation rate was found to be 26.9%.

[0051] Comparative Example 2 The fabric used 10S pure cotton yarn for the front warp, 30S pure cotton yarn for the back warp, 75D polyester-nylon composite yarn (50% polyester + 50% nylon) for the front weft, and 300D nylon with an F count of 536 for the back weft. The fabric was woven using a 3 / 1 twill weave for the front layer and a 5 / 3 satin weave for the back layer, with the weft connecting to the back warp. The fabric was removed from the machine and finished. The finishing process consisted of the following steps: singeing the front side of the fabric at 300°C and a speed of 85 m / min; alkali treatment with 12 g / L sodium hydroxide; drying at 100°C and for 8 min; shrink-proofing using conventional methods; and napping the bottom surface of the fabric to form a napped layer. The breaking strength of the fabric was measured according to GB / T 3923.1-2013 Textiles - Tensile Properties of Fabrics - Part 1: Determination of Breaking Strength and Breaking Elongation (Strip Method). The breaking strength of the resulting fabric was 453 N. The heat retention rate of the fabric was measured according to GB / T 35762-2017 Test method for heat transfer performance of textile products (flat plate method), and the heat retention rate was 27.4%.

[0052] As a result, the fabric strength was high even with the napping applied to the weave structures and yarn configurations of Examples 1 and 2. In Comparative Example 2, yarns similar to those of Examples 1 and 2 were used, but the weave structure did not produce long fluff. In Comparative Example 2, even though the finishing process was adjusted to accommodate a change in the weft yarn to a specific chemical fiber, the resulting fabric was not sufficiently dense due to the weave structure, had low tear strength, and did not have excellent heat retention.

[0053] In the present embodiment, a two-layer fabric is woven using a special yarn composition, and then alkali treatment is performed to significantly shrink the surface weft yarn, making the fabric relatively dense and improving its strength to a certain extent. Then, agitation washing is performed to release internal stress between the warp cotton fibers, reducing the warp shrinkage rate and making the yarns between the surface layers of the fabric denser. A setting treatment is then performed. The chemical fiber used as the weft yarn undergoes structural changes through prolonged heat treatment, thereby improving the stability of the fabric and helping to prevent a decrease in fabric strength due to napping. Due to the dense structure of the fabric, the pattern of the bottom layer is not exposed from the front of the weft, and on the back of the weft, protrusions formed by the weft knuckles of the back weft yarn are formed. Napping creates fine, soft, and dense nap, which improves the warmth retention capacity and ensures the strength of the fabric.

[0054] In the description herein, reference to terms such as "one embodiment," "particular embodiment," "general embodiment," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. References to the general terms herein 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 any one or more embodiments or examples.

[0055] The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art may make some improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention. [Explanation of symbols]

[0056] 10 Front warp 20 Front weft 30 Back Warp 40 Back weft 50 napping brushed layer

Claims

1. A ribbed fleece denim fabric having warmth and comfort, with a napped layer (50) on the bottom surface, A ribbed fleece denim fabric with warmth and comfort, comprising two warp systems and two weft systems, wherein the warp threads are divided into front warp threads (10) and back warp threads (30), the weft threads are divided into front weft threads (20) and back weft threads (40), the front weft threads (20) and the back weft threads (40) are interwoven with the back warp threads (30) in a plain weave, the front warp threads (10) and the front weft threads (20) are interwoven in a twill weave, the front warp threads (10) and the back weft threads (40) are not interwoven, the back weft threads (40) are thicker than the front weft threads (20), the back weft threads (40) are multifilament, and the shrinkage rate of the front weft threads (20) is greater than the shrinkage rate of the back weft threads (40).

2. The rib fleece denim fabric with warmth and comfort according to claim 1, characterized in that the count of the back warp threads (30) is 3 to 8 times the count of the front warp threads (10).

3. The rib fleece denim fabric with warmth and comfort according to claim 2, characterized in that the count of the surface warp yarns (10) is 8S to 32S.

4. The rib fleece denim fabric with warmth and comfort according to claim 1, characterized in that the F number of the back weft (40) is 114F to 900F.

5. The rib fleece denim fabric with warmth and comfort according to claim 4, characterized in that the denier of the single fiber of the back weft (40) is 80D to 500D.

6. The rib fleece denim fabric with warmth and comfort according to claim 5, characterized in that the count of the face weft (20) is 21S to 60S.

7. 2. The rib fleece denim fabric with warmth and comfort according to claim 1, characterized in that the same rear warp yarns (30) have the same type of knuckle with each of the front weft yarns (20), the same rear warp yarns (30) have the same type of knuckle with each of the rear weft yarns (40), and for the same rear warp yarns (30), the type of knuckle formed by the front weft yarns (20) and the type of knuckle formed by the rear weft yarns (40) are opposite.

8. A method for producing a ribbed fleece denim fabric with warmth and comfort, comprising a weaving step and a finishing step, In the weaving step, two warp systems and two weft systems are used, the warp yarns are divided into front warp yarns (10) and back warp yarns (30), the weft yarns are divided into front weft yarns (20) and back weft yarns (40), the front weft yarns (20) and the back weft yarns (40) are interwoven with the back warp yarns (30) in a plain weave, the front warp yarns (10) and the front weft yarns (20) are interwoven in a twill weave, the front warp yarns (10) and the back weft yarns (40) are not interwoven, the back weft yarns (40) are thicker than the front weft yarns (20), the back weft yarns (40) are multifilament, the shrinkage rate of the front weft yarns (20) is greater than the shrinkage rate of the back weft yarns (40), and the front weft yarns (20) are polyester-nylon composite yarns; The manufacturing method is characterized in that the finishing step includes a singeing step, an alkali treatment step, a drying step, a shrink-proofing step, and a napping step in this order.

9. Between the alkali treatment step and the drying step, an agitation washing step is further included, the treatment temperature of which is 40°C to 50°C and the treatment time is 20 minutes to 30 minutes, The method for producing a rib fleece denim fabric with heat retention and comfort according to claim 8, characterized in that a setting process at a setting temperature of 150°C to 170°C and a speed of 20m / min to 40m / min is further included between the drying process and the shrink-proofing process.

10. The method for producing a ribbed fleece denim fabric with warmth and comfort as claimed in claim 8, characterized in that the singeing process temperature is 250°C to 350°C, the speed is 75m / min to 85m / min, and the singeing is only applied to the front side of the process.

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