Rib fleece denim fabric with heat retention and comfort, and method for manufacturing the same.

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 rib-free fleece denim fabric having heat retention and comfort, and a method for producing the same, and belongs to the field of spinning.

Background Art

[0002] Conventional denim fabrics are twill-woven fabrics made by interweaving pure cotton warp yarns dyed with indigo dye and white weft yarns. Their dense and twill-woven retro style is popular among people. By making use of the characteristics of indigo dye itself, manufacturing denim clothing and subjecting it to washing, a part of the indigo dye on the fibers is removed. Thus, such denim clothing has various antique styles and is an important and irreplaceable item in the clothing market.

[0003] Conventional denim clothing is relatively thick, but its heat retention effect is not satisfactory. Therefore, engineers have developed various denim fabrics with heat retention effects. For example, by using yarns with a heat-generating effect for the weft yarns in weaving, functional effects such as far infrared rays and heat generation are imparted to the fabric. Although the effect persists even when the fabric is used for a long time, the heat retention is not obvious. As another example, engineers have developed a composite denim fabric in which denim fabric and fluff are adhered with an adhesive to have a fluff layer on the bottom surface of the denim fabric. However, when this composite denim fabric is used for a long time, it becomes hard due to the deterioration of the adhesive. Also, the viscosity of the deteriorated adhesive decreases, and fluff falls off during washing, and the remaining fluff gets entangled to cause wavy bulges, which affects the comfort.

[0004] Some engineers design denim fabrics as double-woven fabrics. In such double-woven fabrics, the front weft and back warp threads are interwoven to form joints, the back weft threads form floats on the bottom surface, and the bottom surface of the fabric is napped to form a layer of fluff. However, since the fluff is mainly formed by cutting and pulling out the floats, its length is sufficient, but its density is not sufficient, and when the fabric is stretched, the fluff becomes very sparse. In addition, after the fluff is generated by the napping process, fluff is pulled out from the back weft threads as well as from many parts of the front weft and back warp threads, resulting in a significant decrease in the strength of the fabric. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] To overcome the shortcomings of conventional technology, the present invention provides a ribbed fleece denim fabric that is highly durable, maintains a dense pile even when stretched, and provides long-lasting heat retention, offering both warmth and comfort, as well as a method for manufacturing the same. [Means for solving the problem]

[0006] The technical solution employed by this invention to solve its technical problems is as follows: In the first aspect, the present application is: A ribbed fleece denim fabric with a napped napped layer on the bottom surface, providing warmth and comfort. The present invention provides a ribbed fleece denim fabric with warmth and comfort, comprising two warp systems and two weft systems, wherein the warp systems are divided into front warp and back warp, the weft systems are divided into front weft and back weft, the front weft and back weft are woven together with the back warp in a plain weave, the front warp and front weft are woven together in a twill weave, the front warp and back weft are not woven together, the back weft is thicker than the front weft, the back weft is multifilament, and the shrinkage rate of the front weft is greater than that of the back weft.

[0007] The ribbed fleece denim fabric according to this invention, which provides warmth and comfort, uses thick multifilament as the back weft instead of forming a float on the bottom surface, and combines it with the front weft, which has 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 bulges and protrudes downward, covering the front weft. The napped layer is mainly made of the back weft, and the process of forming the napped layer causes little damage to the front warp and front weft. In addition, since the front weft and back weft are woven together with the back warp in a plain weave, the bottom layer of the fabric becomes denser, and furthermore, as the front weft tightens the fabric, the fabric as a whole becomes stronger. Furthermore, because the bottom surface of the fabric is plain weave, the napping does not depend on float, and the back weft is made of thick multifilament threads, the napped layer has short, numerous, and very dense fibers, resulting in good comfort when in contact with the skin. Short fibers are less likely to get tangled and less likely to create bulk, and when the fabric is stretched over a certain area, only the bulkiness of the back weft from the bottom surface decreases, so the fibers do not become significantly sparse.

[0008] In a preferred spinning implementation, the surface warp and surface weft threads are woven together in a 3 / 1 twill weave. This results in a denim-like texture on the surface of the fabric.

[0009] In a preferred spinning implementation, the front warp threads are thicker than the back warp threads. This allows the front warp threads to shield the back warp threads on the front of the fabric.

[0010] Furthermore, the count of the back warp threads is three times or more that of the front warp threads. This is advantageous for exposing the twill weave on the front of the fabric and concealing the plain weave of the bottom layer of the fabric.

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

[0012] Furthermore, the warp thread counts in the aforementioned table range from 8S to 32S.

[0013] In preferred spinning implementations, the F number of the back weft yarn is between 114F and 900F. The F number, also known as the strand number, is used to indicate how many single fibers make up a synthetic fiber multifilament. High F number back weft yarns create more fluff through napping, which works in conjunction with the plain weave structure. Because the fluff is short and numerous, it does not become significantly sparse even when the fabric is stretched.

[0014] Furthermore, the denier of the single fiber of the back weft is 80D to 500D. Napping creates 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 yarn is 21S to 60S. This contributes to a high F number while ensuring sufficient shrinkage by the front weft yarn, and the higher denier back weft yarn shields the front weft yarn at the bottom surface of the fabric.

[0016] In a preferred spinning implementation, the same back warp threads have the same knuckle type with each of the front weft threads, and the same back warp threads have the same knuckle type with each of the back weft threads, and the knuckle type formed by the front weft threads and the knuckle type formed by the back weft threads are opposite for the same back warp threads. As a result, the bottom surface of the fabric without napping has poplin-like ribs, and the fabric has excellent stability, and the heat retention effect is further improved when a napped layer is formed.

[0017] In a second aspect, the present invention relates to a method for manufacturing a ribbed fleece denim fabric that is warm and comfortable, comprising a weaving step and a finishing step, In the weaving step, a system of two warp threads and a system of two weft threads are used, wherein the warp threads are divided into front warp threads and back warp threads, the weft threads are divided into front weft threads and back weft threads, the front weft threads and back weft threads are woven together with the back warp threads in a plain weave, the front warp threads and front weft threads are woven together in a twill weave, the front warp threads and back weft threads are not woven together, the back weft threads are thicker than the front weft threads, the back weft threads are multifilament, the shrinkage rate of the front weft threads is greater than the shrinkage rate of the back weft threads, and the front weft threads are polyester-nylon composite yarns. The manufacturing method provides a finishing process that includes, in this order, a singeing process, an alkali treatment process, a drying process, a shrinkage prevention process, and a napping process.

[0018] The front weft is a polyester-nylon composite yarn that shrinks drastically when treated with alkali. This results in a more densely woven fabric, improving its tear resistance to a certain extent. Furthermore, when the front weft shrinks, the weft knuckles formed at the bottom of the back weft bulge and protrude downwards, becoming the first to be napped. This protects the back warp and front weft, thus solving the problem in conventional napped products where the fabric strength is significantly reduced by the napping process.

[0019] Optionally, the selection and mixing of each thread may be carried out as described in the first embodiment, and the tear resistance of the fabric may be further improved by designing the fabric structure and combining the threads.

[0020] Optionally, between the alkaline treatment step and the drying step, a further agitation washing step may be included, with a treatment temperature of 40°C to 50°C and a treatment time of 20 min to 30 min. Between the drying process and the shrinkage prevention process, a further setting process is included, with a setting temperature of 150°C to 170°C and a speed of 20 m / min to 40 m / min.

[0021] First, the alkaline treatment causes the surface weft threads to shrink significantly, making the fabric denser and improving its strength to some extent. Furthermore, agitation washing releases stress between the cotton fibers in the warp threads, reducing the shrinkage rate of the warp threads and making the threads on the surface of the fabric denser. In addition, the setting treatment structurally alters the synthetic fibers used as weft threads through prolonged heat treatment, thereby improving the stability of the fabric, which helps to suppress the decrease in fabric strength caused by napping.

[0022] Optionally, the processing temperature for the singeing process is 250°C to 350°C, the speed is 75 m / min to 85 m / min, and singeing is performed only on the front side of the process. Performing singeing on one side at a low temperature and high speed is advantageous in reducing the damage that singeing inflicts on synthetic 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 rib fleece denim fabric with heat retention and comfort according to the present invention, the surface weft yarns contract and tighten the fabric, causing the surface weft yarns to be pulled into the fabric, and the knuckles of the thick back weft yarns bulge and protrude downward, covering the surface weft yarns and forming a napped layer. This process causes less damage to the surface warp and surface weft yarns. Furthermore, because the surface weft and back weft yarns are woven together with the back warp yarns in a plain weave, the bottom layer of the fabric becomes denser, and the surface weft yarns tighten the fabric, making the fabric stronger overall. Moreover, because the bottom surface of the fabric is plain weave, the napping does not depend on float, and the back weft yarns are thick multifilaments, the napped layer has short, numerous, and very dense fibers, resulting in good comfort when in contact with the skin. When the fabric is stretched over a certain area, only the bulge of the back weft yarns from the bottom surface decreases, so the fibers do not become significantly sparse.

[0024] Other features and advantages of the present application are described in the following specification, partially revealed, or understood by practicing the present application. The purpose and other advantages of the present application may be achieved and obtained by configurations specifically shown in the described specification and drawings.

Brief Description of the Drawings

[0025] [Figure 1] It is a schematic structural diagram of a rib fleece denim fabric with heat retention and comfort according to an embodiment of the present application. [Figure 2] It is a schematic structural diagram of the texture of a rib fleece denim fabric with heat retention and comfort according to an embodiment of the present application. [Figure 3] It is a schematic structural diagram of a texture formed by warp threads on the back and weft threads on the front. [Figure 4] It is a schematic structural diagram of a texture formed by warp threads on the back and weft threads on the back. [Figure 5] It is a schematic structural diagram of a texture formed by warp threads on the front and weft threads on the front. [Figure 6] It is a schematic structural diagram of a texture formed by warp threads on the front and weft threads on the back.

Modes for Carrying Out the Invention

[0026] Hereinafter, embodiments of the present invention will be described in detail. An example of the embodiment is shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout the drawings. The embodiments described below with reference to the drawings are exemplary and are for explaining the present invention, and should not 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, for the purpose of simplifying the disclosure of the present invention, the components and settings of specific examples will be described. Of course, these are merely examples and do not limit the present invention. Furthermore, the present invention may repeat reference numerals and / or reference characters in different examples, and this repetition is for the purpose of simplification and clarification and does not indicate the relationship between the various embodiments and / or configurations being discussed.

[0028] A rib fleece denim fabric is a denim fabric having a single layer of lint on the bottom surface of the fabric.

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

[0030] Regarding yarn count units, S stands for British count, which is a multiple of the length of yarn weighing 1 pound at the standard moisture content, relative to 840 yards. D stands for denier, a method of expressing the fineness of synthetic fibers, representing the weight in grams of 9,000 meters of silk at the standard moisture content. Referring to Figure 1, an embodiment of the present invention provides a ribbed fleece denim fabric with heat retention and comfort, the ribbed fleece denim fabric comprising two warp systems and two weft systems, the warp being divided into front warp 10 and back warp 30, the weft being divided into front weft 20 and back weft 40, the front weft 20 and back weft 40 are woven together with the back warp 30 in a plain weave, the front warp 10 and front weft 20 are woven together in a twill weave, the front warp 10 and back weft 40 are not woven together, the back weft 40 is thicker than the front weft 20, the back weft 40 is multifilament, the shrinkage rate of the front weft 20 is greater than the shrinkage rate of the back weft 40. Here, the front warp threads 10 and front weft threads 20 are woven together to form the surface layer of the fabric, the back warp threads 30 and back weft threads 40 are woven together 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 layer 50.

[0031] In the embodiments of this invention, by adopting a new structural design and arranging the threads, the back weft threads 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 heat retention and comfort. Specifically, the napping process results in a fabric with high strength and densely packed fluff, so that even when the fabric is stretched, the fluff does not become significantly sparse.

[0032] The principle behind the high strength of napping-treated fabric is as follows: (1) In conventional techniques, napped fabrics usually have many floats formed on the bottom surface of the fabric, so there are few back weft and warp threads that are interwoven. In the embodiment of the present invention, the front weft 20 and back weft 40 are interwoven with the back warp 30 in a plain weave, so there are many points of interweaving, resulting in a denser fabric structure. (2) The weft threads 20 on the surface have the effect of tightening the fabric. (3) The back weft yarn 40 is thicker than the front weft yarn 20, and the shrinkage rate of the front weft yarn 20 is greater than that of the back weft yarn 40. As a result, the front weft yarn 20 is pulled into the interior of the fabric (the central part of the surface and bottom layers), and the thicker back weft yarn 40 bulges and protrudes downward (towards the bottom), covering the front weft yarn 20. It is the back weft yarn 40 that is mainly damaged by napping. (4) The back weft yarn 40 is multifilamentous, and even if a portion of a single fiber is broken by napping, multiple single fibers maintain the strength of the bottom layer.

[0033] The reason why the fibers are densely packed and do not become significantly sparse even when the fabric is stretched is as follows: (1) In the prior art, napped fabrics typically have many floats formed on the bottom surface of the fabric, and the resulting fluff is long and sparse. In the embodiment of the present invention, the front weft 20 and back weft 40 are woven in a plain weave with the back warp 30, and the resulting fluff is short and abundant. (2) The back weft 40 is a multifilament containing multiple single fibers that can be cut. (3) The shrinkage rate of the front weft 20 is greater than that of the back weft 40, and there is a margin to stretch the fabric, so when the fabric is stretched within a certain range, only the bulge of the back weft 40 from the bottom surface decreases, so the fluff does not become significantly sparse.

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

[0035] The structure formed by the back warp and front weft in Figure 2 is shown in Figure 3, the structure formed by the back warp and back weft in Figure 2 is shown in Figure 4, the structure formed by the front warp and front weft in Figure 2 is shown in Figure 5, and the structure formed by the front warp and back weft in Figure 2 is shown in Figure 6. As can be seen from Figure 6, everything is a warp knuckle, that is, all the front warp threads "overlap" on the back weft threads, and the front warp and back weft threads are not interwoven, which corresponds to Figure 1 where all of the back weft threads 40 are under the front warp threads 10.

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

[0037] Furthermore, the threads may be arranged so that the bottom white 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, thereby the front warp threads obscure the back warp threads on the front of the fabric. Specifically, the count of the back warp threads 30 is three times or more that of the front warp threads 10, which is advantageous because the front of the fabric becomes a twill weave and the bottom plain weave layer of the fabric is not exposed. More preferably, the count of the back warp threads 30 is 3 to 8 times that of the front warp threads 10. Also, since the count of the front warp threads 10 is 8S to 32S, it exhibits the texture and effect of a normal denim fabric surface.

[0038] A multifilament contains 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 many fluffs through napping, which work in conjunction with the plain weave structure. The short and numerous fluffs do not become significantly sparse even when the fabric is stretched. More preferably, the back weft yarn 40 has a denier of 80D to 500D for the single fibers, and the napping forms fine and soft fluff, improving the comfort of the fabric when it comes into contact with the skin. Therefore, the front weft yarn 20 has a count of 21S to 60S and can reliably shield with multifilaments of 80D to 500D and 114F to 900F.

[0039] Furthermore, the front weft threads are used to connect the front and back layers of the fabric, and when arranging the threads, making the front weft threads slightly thinner than the front warp threads is advantageous because it makes it difficult to see the bottom layer of the fabric from the front of the fabric processing. Specifically, the front weft threads may be polyester-nylon composite threads, and when the denim fabric is subjected to the necessary washing process, the shrinkage effect of the front weft threads improves, and of course, other threads with high shrinkage may be used for the front weft threads.

[0040] Preferably, referring to Figures 3 and 4, the same back warp thread 30 has the same knuckle type with each front weft thread 20, the same back warp thread 30 has the same knuckle type with each back weft thread 40, and the same back warp thread 30 has opposite knuckle types formed with the front weft thread 20 and with the back weft thread 40.

[0041] In Figures 3 and 4, it appears that a single back warp thread is not woven with the weft thread. However, with the same back warp thread 30, the knuckle type formed by the front weft thread 20 and the knuckle type formed by the back weft thread 40 are opposite. Because the front weft and front warp threads are woven together in a twill weave, the fabric structure is stable and does not loosen. The same back warp thread 30 has the same knuckle type with each front weft thread 20, and the same back warp thread 30 has the same knuckle type with each back weft thread 40. Therefore, when the front weft threads contract, the back weft threads are pulled and bulge downwards, resulting in a poplin-like rib on the bottom surface of the fabric that has not been napped, providing a poplin-like heat retention effect. Furthermore, the napped napped layer 50 formed by the napping process provides an even higher heat retention effect in this fabric.

[0042] Embodiments of the present invention also relate to a method for manufacturing a ribbed fleece denim fabric with heat retention 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 front warp and back warp, the weft is divided into front weft and back weft, the front weft and back weft are woven together with the back warp in a plain weave, the front warp and front weft are woven together in a twill weave, the front warp and back weft are not woven together, the back weft is thicker than the front weft, the back weft is a multifilament, the shrinkage rate of the front weft is greater than the shrinkage rate of the back weft, and the front weft is a polyester-nylon composite yarn. The finishing process includes singeing, alkali treatment, drying, shrinkage prevention, and napping, in that order, providing a method for manufacturing a ribbed fleece denim fabric that offers both warmth and comfort.

[0043] The front weft is a polyester-nylon composite yarn that shrinks drastically when treated with alkali. This results in a more densely woven fabric, improving its tear resistance to a certain extent. Furthermore, when the front weft shrinks, the weft knuckles formed by the back weft at the bottom bulge and protrude downwards, becoming the first to be napped. This downward protrusion by the back weft protects the back warp and front weft, resulting in less damage and solving the problem in conventional napped products where the fabric strength is significantly reduced by the napping process.

[0044] The polyester-nylon composite yarn is a common commercially available polyester-nylon composite yarn, and may specifically be 60% polyester + 40% nylon, 42.9% polyester + 57.1% nylon, 50% polyester + 50% nylon, 66.7% polyester + 33.3% nylon, etc. The composition of the remaining yarn may refer to the above-mentioned example of a ribbed fleece denim fabric with heat retention and comfort. In the drying process, the drying temperature is 100°C to 120°C and the processing time is 5 min to 10 min.

[0045] Specifically, the processing temperature for the singeing process is 250°C to 350°C, the speed is 75 m / min to 85 m / min, and singeing is performed only on the front side of the process. Singeing is used to remove fuzz from the surface of the fabric, and in the embodiments of this application, singeing on one side at a low temperature and high speed is advantageous in reducing the damage that singeing inflicts on synthetic fibers, especially the multifilaments on the back of the fabric.

[0046] Preferably, between the alkali treatment step and the drying step, a further agitation washing step is included, with a treatment temperature of 40°C to 50°C and a treatment time of 20 min to 30 min. Between the drying process and the shrinkage prevention process, there is an additional setting process with a setting temperature of 150°C to 170°C and a speed of 20 m / min to 40 m / min.

[0047] During 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 with low tension. This eliminates the internal stress between the cotton fibers of the weft, causing the fabric to shrink relatively and become denser, resulting in the warp knuckles at the bottom surface of the fabric protruding more.

[0048] Example 1 The fabric was woven according to the 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. After removing from the machine, finishing was performed. The finishing procedure was as follows: Singing of the process front: temperature 300℃, speed 85m / min; Alkali treatment: sodium hydroxide concentration 12g / L; Drying: temperature 100℃, time 8min; Shrinkage prevention by conventional methods; 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: Measurement of breaking strength and elongation at breaking - Strip method". The breaking strength of the obtained fabric was 723N. According to the "GB / T 35762-2017 Test Method for Heat Transfer Performance of Textile Products, Flat Plate Method," the heat retention rate of the woven fabric was measured, and the result was 33.6%.

[0049] Example 2 The fabric was woven according to the 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. After removing from the machine, finishing was performed. The finishing procedure was as follows: Singing of the front of the process: temperature 300℃, speed 85m / min; Alkali treatment: sodium hydroxide concentration 12g / L; Agitation washing: treatment temperature 50℃, treatment time 20min; Drying: temperature 100℃, time 8min; Set: temperature 150℃, speed 40m / min; Shrinkage prevention by normal method; 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: Measurement of breaking strength and elongation at breaking - Strip method". The resulting fabric had a breaking strength of 741N. According to the GB / T 35762-2017 Test Method for Heat Transfer Performance of Textile Products (Plat Plate Method), the heat retention rate of the fabric was measured to be 34.2%.

[0050] Comparative Example 1 10S pure cotton yarn was used as the warp threads on the face, 30S pure cotton yarn as the warp threads on the back, 10S pure cotton yarn as the weft threads on the face, and 10S pure cotton yarn as the weft threads on the back. During weaving, the face layer was 3 / 1 twill weave, the back layer was 5 / 3 satin weave, and the joining points were the connections between the back warp threads and the face weft threads. The fabric was removed from the machine and finished. The finishing procedure was as follows: Single-sided singeing: temperature 500℃, speed 60m / min; shrinkage prevention by the usual method; napping was applied to 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: Measurement of breaking strength and elongation at breaking - Strip method". The breaking strength of the obtained fabric was 389N. According to the "GB / T 35762-2017 Test Method for Heat Transfer Performance of Textile Products, Flat Plate Method," the heat retention rate of the woven fabric was measured and found to be 26.9%.

[0051] Comparative Example 2 10S pure cotton yarn was used 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 number of 536 for the back weft. During weaving, the front layer was 3 / 1 twill weave, the back layer was 5 / 3 satin weave, and the joining points were the connections between the back warp and front weft. The fabric was removed from the machine and finished. The finishing procedure was as follows: Singing of the front of the process: temperature 300℃, speed 85m / min; Alkali treatment: sodium hydroxide concentration 12g / L; Drying: temperature 100℃, time 8min; Shrinkage prevention by normal method; Napping was applied to 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: Measurement of breaking strength and elongation at breaking - Strip method". The resulting fabric had a breaking strength of 453N. According to the GB / T 35762-2017 Test Method for Heat Transfer Performance of Textile Products (Plat Plate Method), the heat retention rate of the fabric was measured to be 27.4%.

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

[0053] In the embodiment of this invention, a two-layer fabric is woven using a special yarn composition, and then subjected to an alkaline treatment to significantly shrink the surface weft threads, making the fabric relatively dense and improving its strength to some extent. Subsequently, agitation washing releases internal stress between the warp cotton fibers, reduces the shrinkage rate of the warp threads, and makes the threads between the surface layers of the fabric denser. Furthermore, a setting treatment is performed. The chemical fibers used as weft threads undergo structural changes through prolonged heat treatment, thereby improving the stability of the fabric, which helps to suppress the reduction 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 process, and on the back of the process, protrusions are formed by the weft knuckles of the back weft threads, creating fine, soft, and dense fluff through napping, thereby improving heat retention while ensuring the strength of the fabric.

[0054] In this specification, when terms such as “one embodiment,” “a specific embodiment,” “a schematic embodiment,” “an example,” “a concrete example,” or “some examples” are used for reference, it means that the specific features, structures, materials, or properties described in relation to that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expression of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials, or properties described may be combined in an appropriate manner in any one or more embodiments or examples.

[0055] The above are preferred embodiments of the present invention, and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and that these improvements and modifications are also considered to be within the scope of protection of the present invention. [Explanation of Symbols]

[0056] 10 Warp threads 20 Front weft yarn 30 Back warp threads 40 Back weft 50 Napping napped layer

Claims

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

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

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

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

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

7. The rib fleece denim fabric with heat retention and comfort according to claim 1, characterized in that each identical back warp thread (30) has the same knuckle type with each of the front weft threads (20), each identical back warp thread (30) has the same knuckle type with each of the back weft threads (40), and in each identical back warp thread (30), the knuckle type formed by the front weft threads (20) and the knuckle type formed by the back weft threads (40) are opposite.

8. A method for manufacturing a ribbed fleece denim fabric that is warm and comfortable, comprising a weaving step and a finishing step, In the weaving step, a system of two warp threads and a system of two weft threads are used, the warp threads are divided into face warp threads (10) and back warp threads (30), the weft threads are divided into face weft threads (20) and back weft threads (40), the face weft threads (20) and back weft threads (40) are woven together with the back warp threads (30) in a plain weave, the face warp threads (10) and face weft threads (20) are woven together in a twill weave, the face warp threads (10) and back weft threads (40) are not woven together, the back weft threads (40) are thicker than the face weft threads (20), the back weft threads (40) are multifilament, the shrinkage rate of the face weft threads (20) is greater than the shrinkage rate of the back weft threads (40), and the face weft threads (20) are a polyester-nylon composite yarn. The manufacturing method is characterized in that the finishing process includes, in this order, a singeing process, an alkali treatment process, a drying process, a shrinkage prevention process, and a napping process.

9. Between the alkaline treatment step and the drying step, there is further included an agitation washing step with a treatment temperature of 40°C to 50°C and a treatment time of 20 min to 30 min. The method for producing a rib fleece denim fabric with heat retention and comfort according to claim 8, further comprising a setting step between the drying step and the shrinkage prevention step, with a setting temperature of 150°C to 170°C and a speed of 20 m / min to 40 m / min.

10. The method for producing a rib fleece denim fabric with heat retention and comfort according to claim 8, characterized in that the processing temperature of the singeing step is 250°C to 350°C, the speed is 75 m / min to 85 m / min, and the singeing is performed only on the front of the process.

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