Moisture-absorbing and easy-to-dye yarn and method for manufacturing the same, and denim fabric and method for manufacturing the same

Abstract

The application discloses a moisture-absorbing and easy-to-dye yarn and a manufacturing method thereof, and a jean fabric and a manufacturing method thereof, and belongs to the field of textiles. The yarn manufacturing procedure comprises opening, carding, drawing, roving and spinning. In the final drawing process, the semi-drawn slivers independently prepared from three raw materials are arranged in the same plane. The semi-drawn sliver in the center is a viscose semi-drawn sliver, the semi-drawn sliver on the outside is a cotton semi-drawn sliver, and the semi-drawn sliver between the viscose semi-drawn sliver and the cotton semi-drawn sliver is a Tencel semi-drawn sliver. The moisture absorption of the obtained yarn increases from outside to inside in turn, a gradient moisture absorption structure is formed, the dyeing liquid can be fully absorbed during dyeing, and the clothes prepared can absorb sweat. In addition, the Tencel fiber and the cotton fiber successively constrain the viscose fiber with a large shrinkage rate from the outside, so that the yarn has a low and stable shrinkage rate after being treated by washing water. The cotton fiber protects the Tencel fiber from the outside, reduces the fibrillation of the Tencel fiber during washing water treatment, and the cotton fiber is arranged on the surface of the yarn, so that the Tencel fiber is shielded and a dim appearance is avoided.

Description

Technical Field

[0001] This invention relates to a moisture-absorbing and easily dyeable yarn and its manufacturing method, as well as denim fabric and its manufacturing method, belonging to the textile field. Background Technology

[0002] Traditional denim fabric, woven with indigo-dyed warp yarns and off-white weft yarns in a twill weave, has always been popular. Due to the unique properties of indigo dye combined with the fiber, denim garments, after undergoing washing processes (enzyme bleaching, chlorine bleaching, oxygen bleaching, etc.), will exhibit varying degrees of fading in different areas, creating a diverse range of distressed styles and becoming an irreplaceable fashion element in the clothing market.

[0003] As people's lifestyles change, their pursuit of denim clothing is no longer limited to style design, but also focuses more on functionality and comfort, which places higher demands on the development of denim fabrics. To improve the moisture absorption and optimize the feel of denim fabrics, regenerated cellulose fibers, such as Tencel, Modal, and viscose, are generally introduced.

[0004] While viscose fiber offers numerous advantages, the use of viscose yarn or the addition of viscose fiber to blended yarns results in high and unstable shrinkage rates in fabrics. This affects the dimensional stability of the finished garments and can easily lead to problems such as twisting. Denim garments, in particular, require more than a dozen washing processes, making deformation more pronounced than in other woven products.

[0005] Tencel has excellent moisture absorption. After absorbing moisture, Tencel becomes stiff and has a high wet strength modulus. However, Tencel is prone to fibrillation. When Tencel yarn or blended yarn is used, denim fabric will have a grayish appearance after washing and will lose the three-dimensional twill effect of ordinary denim fabric.

[0006] Existing technologies also include examples of using regenerated cellulose fibers to create core-spun yarns. In the spinning process, cotton fibers (from the roving process) are used as sheath yarns to wind the regenerated cellulose fibers, which serve as the core yarn. This prevents the regenerated cellulose fibers from being exposed. For example, when Tencel is used as the core yarn, it is encased within the cotton fibers and not directly exposed, thus avoiding a dull appearance after washing. Similarly, when viscose fiber is used as the core yarn, its shrinkage is limited by the constraint of the outer cotton fibers. However, the manufacturing process of core-spun yarn requires the inner layer to be a high-count yarn, with the fibers of the core yarn tightly bound together, which greatly limits the moisture absorption of the regenerated cellulose fibers. On the other hand, compared to ordinary yarn, core-spun yarn has a higher degree of twist, and the fibers of the covering layer are tightly bound together. The contact between the covering layer and the core yarn is also very tight, which means that the gaps in the yarn that can hold water are smaller, which also affects the moisture absorption effect. This not only affects comfort, but when this type of yarn is used as the warp yarn in denim fabric, the dye often cannot penetrate into the yarn after sizing and dyeing. If the core-spun effect is not good, it will cause the warp yarn to show white (a relatively serious quality defect in denim fabric). Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the present invention provides a moisture-wicking and dyeable yarn and its manufacturing method, which introduces regenerated cellulose fibers in a way that is different from core-spun yarn and traditional blending, and provides denim fabric using this moisture-wicking and dyeable yarn and its manufacturing method, which can give full play to the moisture-wicking capacity of regenerated cellulose fibers, while avoiding large shrinkage rate of fabric or loss of denim fabric style.

[0008] The technical solution adopted by this invention to solve its technical problem is:

[0009] In one aspect, this application provides a method for manufacturing moisture-absorbing and dyeable yarn, the process of which includes opening, combing, drawing, roving and spinning in sequence. In the final drawing process, semi-finished slivers made independently from three raw materials are arranged side by side on the same plane. The one in the center is a viscose semi-finished sliver, the one on the outside is a cotton semi-finished sliver, and the one between the viscose semi-finished sliver and the cotton semi-finished sliver is a Tencel semi-finished sliver.

[0010] The moisture-wicking and dyeable yarn manufacturing method provided in this application features a unique sliver distribution design in the drawing process. After the resulting sliver undergoes roving and spinning processes, the yarn structure is roughly as follows: cotton fibers on the outside, Tencel fibers and viscose fibers on the inside, with the viscose fibers in the center, wrapped by the Tencel fibers. The moisture absorption of the entire yarn increases sequentially from the outside to the inside, forming a gradient moisture-wicking structure. This facilitates the full absorption of dye liquor during dyeing, reduces the white core of the yarn, and helps the finished garment absorb sweat. In addition, the Tencel and cotton fibers sequentially protect the viscose fibers on the outside, which helps to restrain the viscose fibers with a high shrinkage rate, resulting in a low and stable shrinkage rate after the yarn undergoes washing treatment. The cotton fibers on the outside protect the Tencel fibers, reducing the fibrillation of Tencel during washing treatment, and the cotton fibers are located on the surface of the yarn, shielding the Tencel and preventing a dull appearance.

[0011] Furthermore, in the opening and carding processes, cotton fiber, viscose fiber, and Tencel fiber are processed independently to obtain viscose sliver, Tencel sliver, and cotton sliver, respectively; the drawing process is a two-stage drawing; in the first drawing of the drawing process, multiple viscose slivers are combined to form a viscose semi-cooked sliver, multiple Tencel slivers are combined to form a Tencel semi-cooked sliver, and multiple cotton slivers are combined to form a cotton semi-cooked sliver.

[0012] When different raw materials are blended, a three-stage blending process is generally used to improve the blending effect. This application uses a two-stage blending process, where each fiber is processed independently and then combined in the two stages, reducing mutual interference between fibers and fully preserving the characteristics of Tencel, cotton, and viscose fibers.

[0013] Furthermore, in the drawing process, the first drawing is to combine 8 green slivers of the same type into 1 semi-cooked sliver, and the final drawing is to combine a total of 8 semi-cooked slivers, including the viscose semi-cooked sliver, the Tencel semi-cooked sliver, and the cotton semi-cooked sliver, into 1 cooked sliver.

[0014] The first step is to combine eight raw slivers to form one semi-cooked sliver, which ensures good uniformity of the slivers made from the same material; the last step is to combine eight semi-cooked slivers to form one cooked sliver, which helps to ensure the orderly arrangement of fibers and the stability of yarn properties.

[0015] Furthermore, in the final drawing process of the drawing process, the semi-finished slivers arranged side by side on the same plane are, from one side to the other, the following: the cotton semi-finished sliver, the Tencel semi-finished sliver, the Tencel semi-finished sliver, the viscose semi-finished sliver, the viscose semi-finished sliver, the Tencel semi-finished sliver, the Tencel semi-finished sliver, and the cotton semi-finished sliver.

[0016] In this arrangement, there are more semi-cooked Tencel yarns. This arrangement helps to fully utilize the gradient moisture absorption effect of the yarn, while ensuring the dyeing effect and dimensional stability of the yarn during subsequent processing.

[0017] Secondly, this application provides a moisture-wicking and dyeable yarn, manufactured using the moisture-wicking and dyeable yarn manufacturing method described in the first aspect. This yarn combines moisture absorption, strength, and dyeability, meeting the functional and comfort requirements of modern denim fabrics.

[0018] Thirdly, this application provides a method for manufacturing denim fabric. During weaving, the moisture-wicking and dyeable yarn described in the second aspect is used as the warp yarn. Utilizing its easy penetration during dyeing, the denim fabric can achieve a uniform and natural color. Moreover, the improved moisture absorption performance of the warp yarn makes the fabric more comfortable and ensures the dimensional stability and resistance to deformation of the fabric in subsequent processing.

[0019] Alternatively, during weaving, parallel hollow honeycomb polyester and irregularly shaped nylon are used as weft yarns. The hollow honeycomb polyester improves its moisture wicking properties through its hollow honeycomb structure, while the irregularly shaped nylon further enhances the moisture conduction effect between fibers, making the fabric drier and more comfortable to wear, suitable for the needs of modern high-performance clothing.

[0020] Optionally, the ratio of the hollow honeycomb polyester to the irregularly shaped cross-section nylon is 1:1.

[0021] Optionally, the finishing process after weaving includes singeing, desizing, and pre-shrinking.

[0022] In the singeing process, the front side of the process is singeed on one side, the singeing machine speed is 70m / min~85m / min, and the singeing temperature is 300℃~500℃;

[0023] In the desizing process, the concentration of desizing enzyme is 8 g / L to 12 g / L, the processing temperature is 50℃ to 65℃, and the machine speed is 60 m / min to 80 m / min;

[0024] In the pre-shrinking process, the machine speed is 20m / min to 45m / min, the rubber blanket compression degree is 12% to 20%, the rubber blanket temperature is 120℃ to 130℃, and the blanket drying cylinder temperature is 120℃ to 130℃.

[0025] Fourthly, this application provides a denim fabric made by the denim fabric manufacturing method described in the fourth aspect, which combines moisture absorption, comfort, stability, and the appearance of traditional denim fabric, thus helping to meet the multifunctional needs of modern consumers for denim clothing.

[0026] The beneficial effects of this invention are as follows: By designing a unique sliver distribution in the drawing process, the structure of the resulting yarn consists of cotton fibers, Tencel fibers, and viscose fibers from the outside to the inside. The hygroscopicity of the entire yarn increases sequentially from the outside to the inside, forming a gradient hygroscopic structure. This facilitates the full absorption of dye liquor during dyeing, reduces the white core of the yarn, and helps the finished garment absorb sweat. In addition, the Tencel and cotton fibers sequentially restrain the high-shrinkage viscose fibers on the outside, resulting in a low and stable shrinkage rate of the yarn after washing. The cotton fibers protect the Tencel fibers on the outside, reducing the fibrillation of Tencel during washing. Furthermore, the cotton fibers are located on the surface of the yarn, shielding the Tencel and preventing a dull appearance.

[0027] 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. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure are described clearly and completely below. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this invention.

[0029] It should be understood that, without conflict, any and all embodiments of the present invention can be combined with technical features of any other embodiment or multiple other embodiments to obtain other embodiments. The present invention includes such combinations to obtain other embodiments.

[0030] Unless otherwise specified, all technical and scientific terms used herein have the standard meaning in the field to which the claimed subject matter pertains. Where multiple definitions exist for a term, the definition herein shall prevail.

[0031] In the textile industry, denim fabric has always been favored for its unique appearance and durability. However, as people's demands for clothing comfort and functionality continue to increase, the shortcomings of traditional denim fabric in terms of moisture absorption and hand feel have gradually become apparent. To improve the moisture absorption of denim fabric, regenerated cellulose fibers, such as Tencel, Modal, and viscose, have been introduced into existing technologies. However, these fibers also have some problems in practical applications, such as the poor dimensional stability of viscose fibers and the tendency of Tencel fibers to fibrillate.

[0032] To address the above problems, this application provides a method for manufacturing moisture-absorbing and easily dyed yarn. The process includes opening, combing, drawing, roving, and spinning in sequence. In the final drawing process, semi-finished slivers made independently from three raw materials are arranged side by side on the same plane. The one in the center is the viscose semi-finished sliver, the one on the outside is the cotton semi-finished sliver, and the one between the viscose and cotton semi-finished slivers is the Tencel semi-finished sliver.

[0033] This application embodiment features a unique sliver distribution design in the drawing process. After roving and spinning, the resulting sliver produces a yarn with cotton fibers on the outside, Tencel and viscose fibers on the inside, and viscose fibers in the center, wrapped by Tencel fibers. Compared to core-spun yarn, the yarn produced in this application embodiment does not have obvious layering. Core-spun yarn requires the core yarn to be fine enough to be wrapped by the outer layer. However, this application embodiment, after a specific drawing process, continues the roving and spinning processes on the sliver, without requiring the viscose fiber sliver to be too fine, avoiding excessively tight bonding between the viscose fibers, and also without requiring a high degree of twist in the outer layer. The overall twist of the yarn is consistent with the warp yarns used in ordinary denim fabric, which is beneficial for maximizing moisture absorption. The yarn structure is not obtained by layering but by the orderly arrangement of slivers of different materials, thus avoiding the core-exposed problem of core-spun yarn.

[0034] The hygroscopicity of the entire yarn increases from the outside to the inside, forming a gradient hygroscopic structure. This is beneficial for fully absorbing dye during dyeing, reducing the white core of the yarn, and making the finished garments more hygroscopic.

[0035] Tencel and cotton fibers protect the viscose fibers in turn, which helps to restrain the viscose fibers with a high shrinkage rate, resulting in low and stable shrinkage of the yarn after washing.

[0036] The cotton fibers protect the Tencel fibers on the outside, reducing the fibrillation of Tencel during washing. The cotton fibers are located on the surface of the yarn, which covers the Tencel and prevents it from having a dull appearance.

[0037] Therefore, it can leverage the advantages of the three fibers while masking their respective shortcomings, which helps to stably control the shrinkage rate of the yarn within a small range, improve the comfort of the yarn, and maintain the appearance and style of traditional denim fabric.

[0038] When different raw materials are blended, a three-stage blending process is generally used to improve the blending effect of the fibers. In this application, cotton fiber, viscose fiber, and Tencel fiber are processed independently in the opening and carding processes to obtain viscose sliver, Tencel sliver, and cotton sliver, respectively; the drawing process is a two-stage process; in the first stage of the drawing process, multiple viscose slivers are combined to form a viscose semi-finished sliver, multiple Tencel slivers are combined to form a Tencel semi-finished sliver, and multiple cotton slivers are combined to form a cotton semi-finished sliver.

[0039] In the first doubling (first doubling), slivers of the same raw material are evenly mixed. In the second doubling (final doubling), slivers of different raw materials are arranged according to a specific rule. This results in a yarn with viscose fiber in the center, cotton fiber on the outside, and Tencel fiber in the middle of cotton and viscose fibers in the radial cross section. This is beneficial for achieving gradient moisture absorption and improving dimensional stability after washing. Moreover, unlike existing technologies that use three doubling processes, this avoids repeated doubling and stretching of multiple slivers, and prevents excessive fiber hairiness from forming in the sliver.

[0040] In the drawing process, the first drawing combines eight slivers of the same type into one semi-finished sliver, while the final drawing combines eight semi-finished slivers, including viscose, Tencel, and cotton slivers, into one finished sliver. This eight-sliver combination ensures that there is no excessive sliver accumulation in the fiber arrangement. Through two rounds of eight-sliver combination, the fiber structure remains relatively stable at different stages, which is beneficial for forming a stable yarn structure and contributes to the yarn's moisture absorption and dyeing uniformity.

[0041] Specifically, in the final drawing stage of the drawing process, the semi-finished slivers arranged side-by-side on the same plane, from one side to the other, are: cotton semi-finished sliver, Tencel semi-finished sliver, Tencel semi-finished sliver, viscose semi-finished sliver, viscose semi-finished sliver, Tencel semi-finished sliver, Tencel semi-finished sliver, and cotton semi-finished sliver. This helps to fully utilize the good moisture absorption and wearing comfort properties of Tencel and viscose fibers, and effectively avoids the problem of Tencel fiber fibrillation affecting the appearance of denim fabric.

[0042] When using the yarn obtained above to make denim fabric, it is best to use it as the warp yarn. This yarn has good moisture absorption and dyeing properties, and can be dyed to the center of the yarn during sizing. Using this sized yarn as the warp yarn in the weaving of denim fabric can achieve low and stable shrinkage when the denim fabric undergoes subsequent processing, while maintaining the same appearance as ordinary denim fabric, and providing better comfort and moisture absorption and breathability.

[0043] Preferably, the denim fabric provided in this application embodiment uses the aforementioned moisture-wicking and easily dyed yarn as warp yarns, and parallel hollow honeycomb polyester and irregularly shaped cross-section nylon as weft yarns. Hollow honeycomb polyester has a hollow structure, which increases the fabric's moisture-wicking properties, while irregularly shaped cross-section nylon has a special cross-sectional shape and also has good moisture-wicking capabilities. The combined use of these two materials allows the denim fabric to absorb moisture using the warp yarns and quickly transfer sweat to other parts of the garment using the weft yarns, causing sweat to spread rapidly on the fabric and accelerate evaporation.

[0044] More preferably, the ratio of hollow honeycomb polyester to irregularly shaped nylon in the weave is 1:1. This weave ratio improves the moisture wicking properties of the fabric while maintaining the balance of the fabric structure, resulting in better breathability and moisture absorption in denim fabric.

[0045] Similar to the weave structure of general denim fabric, the denim fabric in this embodiment can have a three-up-one-down twill weave, characterized by numerous warp weave points on the front and numerous weft weave points on the back. When the human body sweats, the weft yarns, made of hollow honeycomb polyester and irregularly shaped cross-section nylon, have excellent moisture-wicking properties, quickly guiding sweat from the underside of the fabric to the warp weave points on the fabric surface. The sweat is then rapidly absorbed by the cotton fibers on the warp yarn surface. The warp yarns are composed of Tencel, with viscose fibers further in the center, gradually increasing in moisture absorption (Tencel fibers have a stronger moisture absorption capacity than cotton fibers, and viscose fibers have a stronger moisture absorption capacity than Tencel), creating a gradient moisture absorption effect. Therefore, there is relatively little residual moisture on the fabric surface. Through the action of external air convection, the sweat can be quickly evaporated, thereby accelerating the further continuous conduction of sweat inside, achieving a quick-drying effect.

[0046] Meanwhile, the Tencel fibers are encased in cotton fibers, effectively preventing quality issues caused by the fibrillation of Tencel fibers from appearing on the fabric surface. After absorbing moisture, Tencel has strong wet strength and good fiber stiffness, thus preventing the fabric from becoming soft and wrinkled, maintaining both drape and stiffness.

[0047] Post-weaving finishing processes include singeing, desizing, and pre-shrinking.

[0048] In the singeing process, the front side of the process is singeed on one side. The singeing machine speed is 70m / min~85m / min and the singeing temperature is 300℃~500℃.

[0049] In the desizing process, the concentration of desizing enzyme is 8g / L~12g / L, the processing temperature is 50℃~65℃, and the machine speed is 60m / min~80m / min;

[0050] In the pre-shrinking process, the machine speed is 20m / min~45m / min, the rubber blanket compression degree is 12%~20%, the rubber blanket temperature is 120℃~130℃, and the blanket drying cylinder temperature is 120℃~130℃.

[0051] In the embodiment where the aforementioned moisture-absorbing and easily dyed yarn is used as the warp, and the side-by-side hollow honeycomb polyester and irregularly shaped cross-section nylon are used as the weft, the process front is mostly warp weft points, and the warp yarn is yarn spun from fine fibers. The process back is mostly weft weft points, and the weft yarn is chemical fiber filament. Singeing only one side of the process front is beneficial for removing fiber fuzz from the process front and avoids excessive heat deformation of the chemical fiber filament.

[0052] Example 1

[0053] Opening: Cotton fibers, viscose fibers, and Tencel fibers are opened separately.

[0054] Combing: Each fiber passes through a combing machine to generate its own sliver, ensuring that the fibers are arranged neatly and evenly.

[0055] Drawing: A two-stage drawing process is adopted. In the first drawing, eight similar raw slivers are combined into one semi-finished sliver, with each raw sliver having the same weight and each semi-finished sliver having the same weight. In the final drawing, cotton, viscose, and Tencel semi-finished slivers are sequentially arranged side by side and combined into one finished sliver. The semi-finished slivers arranged side by side on the same plane, from one side to the other, are as follows: cotton semi-finished sliver, Tencel semi-finished sliver, Tencel semi-finished sliver, viscose semi-finished sliver, viscose semi-finished sliver, Tencel semi-finished sliver, Tencel semi-finished sliver, and cotton semi-finished sliver.

[0056] Roving and spinning: The sliver is subjected to conventional roving and spinning processes to obtain the yarn of Example 1, which is used as warp yarn.

[0057] The warp yarns are sized and dyed, then woven with the weft yarns (hollow honeycomb polyester and shaped cross-section nylon arranged in a 1:1 ratio). Finishing is performed according to the following requirements:

[0058] Singeing: Single-sided singeing is performed on the front side of the process. The singeing machine speed is 70m / min and the singeing temperature is 350℃.

[0059] Desizing: The desizing enzyme concentration was 12 g / L, the treatment temperature was 65℃, and the vehicle speed was 70 m / min.

[0060] Pre-shrinkage: vehicle speed is 45m / min, rubber blanket compression degree is 16%, rubber blanket temperature is 130℃, and blanket drying cylinder temperature is 130℃.

[0061] The shrinkage rate of the obtained fabric was tested, and the warp shrinkage rate was found to be -1.8%.

[0062] The obtained fabric was tested according to GB / T 21665.2-2019 standard, and the test data are shown in Table 1.

[0063] Table 1

[0064]

[0065] Example 2

[0066] Opening: Cotton fibers, viscose fibers, and Tencel fibers are opened separately.

[0067] Combing: Each fiber passes through a combing machine to generate its own sliver, ensuring that the fibers are arranged neatly and evenly.

[0068] Drawing: A two-stage drawing process is adopted. In the first drawing, eight similar raw slivers are combined into one semi-finished sliver, with each raw sliver having the same weight and each semi-finished sliver having the same weight. In the final drawing, cotton, viscose, and Tencel semi-finished slivers are sequentially arranged side by side and combined into one finished sliver. The semi-finished slivers arranged side by side on the same plane, from one side to the other, are as follows: cotton semi-finished sliver, Tencel semi-finished sliver, Tencel semi-finished sliver, viscose semi-finished sliver, viscose semi-finished sliver, Tencel semi-finished sliver, Tencel semi-finished sliver, and cotton semi-finished sliver.

[0069] Roving and spinning: The sliver is subjected to conventional roving and spinning processes to obtain the yarn of Example 2, which is used as warp yarn.

[0070] The warp yarns are sized and dyed, then woven with the weft yarns (hollow honeycomb polyester and shaped cross-section nylon arranged in a 1:1 ratio). Finishing is performed according to the following requirements:

[0071] Singeing: Single-sided singeing is performed on the front side of the process. The singeing machine speed is 85m / min and the singeing temperature is 500℃.

[0072] Desizing: The desizing enzyme concentration was 10 g / L, the treatment temperature was 50℃, and the vehicle speed was 60 m / min.

[0073] Pre-shrinkage: vehicle speed is 30m / min, rubber blanket compression degree is 12%, rubber blanket temperature is 120℃, and blanket drying cylinder temperature is 125℃.

[0074] The shrinkage rate of the obtained fabric was tested, and the warp shrinkage rate was found to be -2.1%.

[0075] The obtained fabric was tested according to GB / T 21665.2-2019 standard, and the test data are shown in Table 2.

[0076] Table 2

[0077]

[0078] Comparative Example 1

[0079] Opening: The cotton fiber, viscose fiber, and Tencel fiber are mixed and opened. By weight, cotton fiber accounts for 25%, Tencel fiber accounts for 50%, and viscose fiber accounts for 25%.

[0080] Combing: Combing the blended raw materials to obtain slivers ensures that the fibers are arranged neatly and evenly.

[0081] Draw-to-draw: A three-draw process is adopted, in which 8 draws are combined into 1 draw in each draw.

[0082] Roving and spinning: The sliver is subjected to conventional roving and spinning processes to obtain the yarn of Comparative Example 1, which is used as warp yarn.

[0083] The warp yarns are sized and dyed, then woven with the weft yarns (hollow honeycomb polyester and shaped cross-section nylon arranged in a 1:1 ratio). Finishing is performed according to the following requirements:

[0084] Singeing: Single-sided singeing is performed on the front side of the process. The singeing machine speed is 85m / min and the singeing temperature is 400℃.

[0085] Desizing: The desizing enzyme concentration was 8 g / L, the treatment temperature was 55℃, and the vehicle speed was 65 m / min.

[0086] Pre-shrinkage: vehicle speed is 35m / min, rubber blanket compression degree is 12%, rubber blanket temperature is 120℃, and blanket drying cylinder temperature is 120℃.

[0087] The shrinkage rate of the obtained fabric was tested, and the warp shrinkage rate was found to be -4.8%.

[0088] The obtained fabric was tested according to GB / T 21665.2-2019 standard, and the test data are shown in Table 3.

[0089] Table 3

[0090]

[0091] Comparative Example 2

[0092] Opening: Cotton fibers and viscose fibers are opened separately.

[0093] Combing: Each fiber passes through a combing machine to generate its own sliver, ensuring that the fibers are arranged neatly and evenly.

[0094] Drawing: A two-stage drawing process is adopted, in which the raw slivers of the two raw materials are drawn separately to obtain cotton slivers and viscose slivers.

[0095] Roving: The two types of slivers are roving through conventional roving processes to obtain cotton roving and viscose roving.

[0096] Fine spinning: First, viscose roving is fine-spun to obtain viscose yarn. Then, cotton-covered viscose core-spun yarn is made: In the fine spinning machine, the core yarn is made of viscose yarn, and the outer layer is covered with cotton staple fiber roving. The covering process is carried out in a conventional core-spun yarn process to obtain cotton-covered viscose yarn.

[0097] The warp yarns are sized and dyed, and then woven with the weft yarns (hollow honeycomb polyester and nylon with irregular cross sections arranged in a 1:1 ratio).

[0098] Follow these requirements for post-processing:

[0099] Singeing: Single-sided singeing is performed on the front side of the process. The singeing machine speed is 80m / min and the singeing temperature is 420℃.

[0100] Desizing: The desizing enzyme concentration was 12 g / L, the treatment temperature was 58℃, and the vehicle speed was 65 m / min.

[0101] Pre-shrinkage: vehicle speed is 20m / min, rubber blanket compression degree is 15%, rubber blanket temperature is 125℃, and blanket drying cylinder temperature is 125℃.

[0102] The shrinkage rate of the obtained fabric was tested, and the warp shrinkage rate was found to be -2.8%.

[0103] The obtained fabric was tested according to GB / T 21665.2-2019 standard, and the test data are shown in Table 4.

[0104] Table 4

[0105]

[0106] Meanwhile, the biggest problem with Comparative Example 2 is that some fabric processes have flaws where the warp yarns are exposed on the front.

[0107] By comparing the embodiments with the comparative examples, it can be seen that the unique process design in the embodiments is superior to that in the comparative examples in terms of yarn moisture absorption, dimensional stability and dyeing effect. In particular, it demonstrates significant technical advantages in solving shrinkage and whitening phenomena.

[0108] The spinning method of this invention forms a yarn with relatively uniform internal fiber cohesion and orderly arrangement of components in cross-section. Compared with traditional single-fiber yarn, it forms three layers in the fiber cross-section, which is different from the structure of core-spun yarn. By changing the drawing process, different distributions of different fibers are achieved, resulting in a gradient moisture absorption effect. It can also effectively maintain the appearance of cotton fibers used in traditional denim fabrics, and fully utilize the good moisture absorption and wearing comfort properties of Tencel and viscose fibers, effectively avoiding the problem of Tencel fibers easily becoming fibrillated.

[0109] 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., refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example that are 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.

[0110] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various 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.

Claims

1. A method of manufacturing a hygroscopic and easily dyeable yarn, the process comprising, in order, opening, carding, drawing, roving, and spinning, characterized in that, In the final drawing process of the drawing process, the semi-drawn yarns made from the three raw materials are arranged side by side in the same plane, the viscose semi-drawn yarn is in the center, the cotton semi-drawn yarn is on the outside, and the Tencel semi-drawn yarn is between the viscose semi-drawn yarn and the cotton semi-drawn yarn; In the opening process and the carding process, the cotton fiber, the viscose fiber and the Tencel fiber are treated independently to obtain the viscose sliver, the Tencel sliver and the cotton sliver respectively; the drawing process is two-drawing; in the first drawing process of the drawing process, 8 viscose slivers are combined into 1 viscose semi-drawn yarn, 8 Tencel slivers are combined into 1 Tencel semi-drawn yarn, and 8 cotton slivers are combined into 1 cotton semi-drawn yarn; in the final drawing process, the semi-drawn yarns including the viscose semi-drawn yarn, the Tencel semi-drawn yarn and the cotton semi-drawn yarn are combined into 1 drawn yarn.

2. The method for producing moisture-absorbing and easily dyed yarn according to claim 1, characterized in that, In the final drawing process of the drawing process, the semi-drawn yarns arranged side by side in the same plane are in the following order from one side to the other side: the cotton semi-drawn yarn, the Tencel semi-drawn yarn, the Tencel semi-drawn yarn, the viscose semi-drawn yarn, the viscose semi-drawn yarn, the Tencel semi-drawn yarn, the Tencel semi-drawn yarn and the cotton semi-drawn yarn.

3. A moisture-absorbing, easy-to-dye yarn, characterized by The moisture-absorbing and easy-to-dye yarn is made by the method of any one of claims 1 to 2.

4. A method of making a denim fabric, characterized by, In weaving, the moisture-absorbing and easy-to-dye yarn of claim 3 is used as the warp yarn.

5. The method of claim 4, wherein, In weaving, the hollow honeycomb polyester and the profiled cross-section nylon are used as weft yarns.

6. The method of making a denim fabric according to claim 5, wherein, The weaving ratio of the hollow honeycomb polyester and the profiled cross-section nylon is 1:

1.

7. The method of claim 4, wherein, The post-finishing after weaving includes the singeing process, the desizing process and the preshrinking process; In the singeing process, the process front is singed on one side, the singeing machine speed is 70m / min to 85m / min, and the singeing temperature is 300℃ to 500℃; In the desizing process, the desizing enzyme concentration is 8g / L to 12g / L, the treatment temperature is 50℃ to 65℃, and the speed is 60m / min to 80m / min; In the preshrinking process, the speed is 20m / min to 45m / min, the rubber blanket compression degree is 12% to 20%, the rubber blanket temperature is 120℃ to 130℃, and the blanket drying cylinder temperature is 120℃ to 130℃.

8. A denim fabric characterized in that, The jean fabric is made by the method of any one of claims 4 to 7.

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