Mulberry silk and cashmere large-belly belt yarn and preparation method thereof

Abstract

This invention belongs to the field of textile fancy yarn processing technology, specifically relating to a mulberry silk and cashmere belly-shaped yarn and its preparation method, including the following steps: Combed cashmere and mulberry silk are mixed at a mass ratio of 10-40:60-90, and subjected to pre-treatment and conditioning; the conditioned mixed fibers are then sequentially processed through opening, carding, drawing, and roving to obtain roving; the roving is then CNC-spun into belly-shaped yarn using a spinning machine, with a draft ratio of 1 during the spinning process. The yarn has a 1-16x ratio, a base yarn length of 20-36 Nm / L, a 10-15 cm "belly" section length, a 2.5-3.2x ratio, a spacing of 25-48 cm, a spinning twist of 610-824 T / m, a Z-twist direction, and a spinning speed of 120-140 r / min. After winding and cleaning the "belly" yarn, it undergoes a setting process. The set "belly" yarn is then woven into a ribbon yarn with a feed tension of 0.3-0.4 cN / tex. After weaving, it is set again to obtain the "belly" ribbon yarn. The prepared "belly" ribbon yarn has low overall hairiness, with fibers tightly and firmly bound together, preventing the "belly" sections from falling off or slipping.

Description

Technical Field

[0001] This invention belongs to the field of textile fancy yarn processing technology, specifically relating to a mulberry silk cashmere belly band yarn and its preparation method, which is particularly suitable for processing high-end special fancy yarns for high-end light luxury knitwear, clothing scarves and hats. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] Big-bellied fancy yarn gets its name from the alternating thick and thin sections on a single yarn. The cross-section of the thick section is more than three times that of normal yarn, with a length of 2-10cm and a date-shaped appearance. The raw materials are mainly wool and other wool-type long fibers. With its three-dimensional texture and soft, full feel, it has become a core raw material for high-end textile fabrics.

[0004] The existing processing technology for slub yarn has many technical drawbacks and cannot be adapted to the blended system of mulberry silk and cashmere: traditional slub yarn is mostly formed directly by hollow spindle covering and Sirospun technology, and cannot first spin the slub structure of standard slub yarn into fine yarn, and then weave the ribbon a second time. The slub structure of the large-belly yarn is messy, uneven in thickness, and lacks three-dimensionality, making it impossible to achieve both the fluffy softness of cashmere and the smooth luster of mulberry silk. The poor cohesion of the blended fibers of mulberry silk and cashmere makes it prone to problems such as fiber shedding, excessive hairiness, yarn breakage, slub slippage, and excessive stiffness in the thick and thin sections when spinning slub yarn on a twisting machine. The yarn formation rate is low, and it will directly collapse the slub structure of the large-belly yarn, resulting in a flat and stiff large-belly area, rough hand feel, easy fraying, poor elasticity, and easy deformation in subsequent weaving and dyeing processes. Moreover, there is no dedicated supporting process for the mulberry silk and cashmere blend system, from pre-spinning pretreatment to fine yarn slub technology, low-tension webbing, and low-temperature setting, resulting in unstable product quality and failing to meet the needs of high-end fabrics. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a mulberry silk cashmere belly-strip yarn and its preparation method.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides a method for preparing mulberry silk and cashmere belly-shaped yarn, comprising the following steps: Combed cashmere and mulberry silk are mixed in a mass ratio of 10-40:60-90, and then subjected to wool pretreatment and conditioning treatment. The blended fibers, after undergoing conditioning treatment, are sequentially processed through opening, carding, drawing, and roving to obtain roving; The roving is spun into a large-belly yarn using a ring spinning machine with CNC control. The draft ratio during the spinning process is 11-16 times, the base yarn is 20NM / 1~36NM / 1, the large-belly section length is 10-16cm, the ratio is 2.5-3.2 times, the spacing is 25-48cm, the spinning twist is 610-824T / m, the twist direction is Z twist, and the spinning machine speed is 120-140r / min. After the yarn with a large belly is wound and cleaned, it undergoes a setting process; The shaped belly yarn is woven into a ribbon yarn, with a yarn feeding tension of 0.3~0.4cN / tex; After weaving, the yarn is set to obtain the large belly-shaped yarn.

[0007] Secondly, the present invention provides a mulberry silk cashmere belly band yarn, which is prepared by the aforementioned preparation method.

[0008] The beneficial effects achieved by one or more embodiments of the present invention described above are as follows: The finished belly-length ribbon yarn prepared by this invention has a uniform and three-dimensional belly-length section, a full and rich texture, a soft and skin-friendly feel, and combines the excellent warmth of cashmere with the natural soft luster of mulberry silk. Its overall quality far surpasses that of ordinary fancy ribbon yarns on the market.

[0009] The yarn for the belly band prepared by this invention has less overall hairiness, and the fibers are tightly and firmly bound together. The belly section is not easy to fall off or slip and misalign. The finished band is flat and smooth without curling or fraying. It is not easily deformed during subsequent weaving, dyeing, and washing processes, and it does not pill or shed during daily use.

[0010] The overall spinning and weaving production process of this invention is smooth and stable, with an extremely low yarn breakage rate, high product yield, strong equipment versatility, and the ability to quickly start mass production.

[0011] In this invention, the entire production process involves no chemical modification or high-temperature damage processing, preserving the excellent properties of the natural fiber to the greatest extent possible. It is green, environmentally friendly, and healthy, and is widely applicable to various fields such as high-end children's wear, luxury scarves, high-end knitwear, and high-end fabrics. Attached Figure Description

[0012] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0013] Figure 1 This is a picture of the actual product of the mulberry silk and cashmere belly-belly yarn prepared by this invention; Figure 2 This is a picture of the finished product of the belly band yarn knitted fabric of this invention. Detailed Implementation

[0014] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0015] To address the technical problems mentioned in the background art, the present invention provides a method for preparing mulberry silk and cashmere belly-shaped yarn, comprising the following steps: Combed cashmere and mulberry silk are mixed in a mass ratio of 10-40:60-90, and then subjected to wool pretreatment and conditioning treatment. The blended fibers, after undergoing conditioning treatment, are sequentially processed through opening, carding, drawing, and roving to obtain roving; The roving is spun into a large-belly yarn using a ring spinning machine with CNC control. The draft ratio during the spinning process is 11-16 times, the base yarn is 20NM / 1-36NM / 1, the large-belly section length is 10-16cm, the ratio is 2.5-3.2 times, the spacing is 25-48cm, the spinning twist is 610-824T / m, the twist direction is Z twist, and the spinning speed is 120-140r / min. After the yarn with a large belly is wound and cleaned, it undergoes a setting process; The shaped belly yarn is woven into ribbon yarn, with a yarn feeding tension of 0.3-0.4 cN / tex; After weaving, the yarn is set to obtain the large belly-shaped yarn.

[0016] The spinning twist is 610-824T / m, with a Z-twist direction, to ensure that the fibers at the large belly section do not loosen or fall off.

[0017] After spinning, a single yarn with slub joints made of mulberry silk and cashmere is obtained. The slub joints are evenly distributed, full and fluffy, without broken ends or slippage.

[0018] Traditional one-step coating processes for producing slub yarn with a "belly" shape suffer from problems such as irregular distribution of the "belly" segments, poor three-dimensional effect, easy slippage, and easy loosening, and also fail to retain the natural advantages of cashmere's softness and silk's luster. In this invention, mulberry silk and cashmere slub yarn with a "belly" shape is first CNC spun on a ring spinning machine, then the structure is locked by low-temperature pre-setting of the yarn cones, and finally, the ribbon yarn is woven at low tension. This results in a regular, full, three-dimensional distribution of the "belly" segments, preventing slippage and loosening, and fully preserving the natural advantages of cashmere's softness and silk's luster.

[0019] Silk and cashmere blends often exhibit poor cohesion, leading to issues like yarn breakage, flyaways, and slub deformation when using traditional spinning processes, resulting in low yarn yield. To address this, customized spinning parameters for silk and cashmere blends have been developed, precisely controlling segmented draft ratios, slub length, high count and twist, and spinning tension. This effectively solves these industry challenges, achieving a yarn yield of over 98%. The entire process, from fiber pretreatment and pre-spinning to fine yarn slub spinning, has been optimized, improving the cohesion between silk and cashmere fibers while reducing flyaways, yarn breakage, fiber splitting, and excessive hairiness.

[0020] Traditional methods of producing slub yarn often result in stiffness, flat texture, uneven edges, and a tendency to curl and fray. This invention utilizes a needle-cylinder weaving machine combined with an extremely low-tension, gentle weaving process, ensuring that the original three-dimensional structure of the slub yarn is not compressed, stretched, or collapsed throughout the entire process. The resulting yarn has smooth, even edges that do not curl or fray, exhibits a strong three-dimensional texture, and has a fluffy, soft feel.

[0021] Traditional textile processes may suffer from problems such as complex procedures, high equipment requirements, difficulty in mass production and promotion, and unstable product quality. This invention constructs an integrated and dedicated process system encompassing fiber pretreatment, pre-spinning, fine yarn spinning, winding, yarn setting, weaving, and finished product setting. The entire process is compatible with conventional textile equipment on the market, requiring no additional equipment modifications, facilitating mass production and promotion, and ensuring stable and reliable product quality, making it suitable for the large-scale production of high-end fabrics.

[0022] In some embodiments, the mass ratio of combed cashmere to mulberry silk is 10-20:90-80.

[0023] In some embodiments, the fineness of the combed cashmere is 15.5-16.5 μm and the fiber length is 34-36 mm.

[0024] In some embodiments, the fiber length of the mulberry silk is 38-40 mm.

[0025] In some embodiments, during the wool pretreatment process, the wool-forming aids added account for 6%-8% of the total mass of the raw materials.

[0026] Preferably, the wool-binding agent is selected from at least one of antistatic agents, softening lubricants, and fiber binding agents.

[0027] In some embodiments, the fiber moisture content during the conditioning treatment is 22%-24%, the conditioning temperature is 25-32℃, the relative humidity of the environment is 65%-70%, and the conditioning time is 24-36h.

[0028] Through conditioning treatment, static electricity in the fibers is eliminated, the silk and cashmere fibers are softened, the cohesion between fibers is improved, and problems such as flyaways, yarn breakage, and silk splitting are prevented in subsequent spinning.

[0029] In some embodiments, the opening speed is 400~450 r / min. Low-speed, gentle opening is used to avoid fiber damage.

[0030] In some embodiments, the sliver weight in the carding process is 16-18 g / 5m. The carding process is used to remove short fibers and impurities.

[0031] In some embodiments, during the drawing process, two drawing passes are performed with a roller spacing of 18*20mm, a total draft ratio of 6.5~7.5 times, and a drawing speed of 80~120m / min. This ensures that the finished sliver is uniform and free of breaks.

[0032] In some embodiments, during the roving process, the roving weight is 4.5~5.5 g / 10m, and the roller speed is 180~200 r / min. This produces a uniform and smooth blended roving.

[0033] In some embodiments, during the winding and defect removal process of the slub yarn, the machine speed is 480~520m / min, and the yarn tension is kept relatively low. Excessively long and thick sections are removed, while preserving the original slub structure intact. Collapse or flattening of the slub sections is prevented, resulting in a neat, conical yarn tube for easier subsequent weaving.

[0034] In some embodiments, after the slub yarn is wound and cleaned, the method for setting it is as follows: the slub yarn is steamed at a low temperature of 45-55℃ for 20-30 minutes to obtain the finished slub ribbon yarn. This is used to eliminate residual stress inside the yarn, stabilize the shape of the slub section, and ensure that the yarn in the ribbon production is straight and free of braids.

[0035] In some embodiments, during the process of weaving the shaped belly yarn into the ribbon yarn, the needle pitch is 1.2-2.0mm, the number of needles is 3-6, the weaving speed is 300-350r / min, the finished product width is 4-8mm, and the weaving structure adopts a weft knitting structure.

[0036] The shaped slub section yarn is directly fed into a needle tube loom to gently weave a ribbon yarn with zero pressure and low tension throughout the process, preserving the three-dimensional texture of the slub section.

[0037] The weft knitting structure does not compress the protruding parts of the large belly, thus fully preserving the three-dimensional texture of the bamboo joint.

[0038] The finished product has a width of 4-8mm, with smooth edges, no curling, and no frayed edges.

[0039] Secondly, the present invention provides a mulberry silk cashmere belly band yarn, which is prepared by the aforementioned preparation method.

[0040] To further highlight the technological improvements and innovative advantages of this invention, a comprehensive comparison of parameters, performance, and process effects between the traditional yarn preparation process and the patented process of this invention is presented in Table 1: Table 1. Comparison of the technical advantages of the process of the present invention compared with the traditional process.

[0041] The present invention will be further described below with reference to the embodiments.

[0042] Example 1 A method for preparing a mulberry silk and cashmere belly band yarn includes the following steps: Raw material ratio: 15% combed cashmere, 85% mulberry silk fiber; The wool finishing agent contains 7.2% by weight of an antistatic agent and 0.8% by weight of a wool finishing oil.

[0043] (1) Fiber pretreatment: Combed cashmere and mulberry silk are mixed in proportion; the wool blending agent is diluted 10 times and sprayed evenly on the surface of the mixed fibers, so that the amount of wool blending agent added accounts for 7% of the total mass of raw materials, and the moisture content of the mixed fibers is adjusted to 23%; then the mixed fibers are placed in a constant temperature and humidity environment of 30℃ and 70% for curing for 24 hours. (2) Pre-spinning roving process: The blended fibers, after conditioning, are sequentially processed through opening, carding, drawing, and roving to produce roving that meets the requirements for fine yarn spinning. Specifically: Opening process: Opening at low speed and gently, with an opening speed of 450 r / min, to avoid fiber damage; Carding process: light weight, sliver weight 18g / 5m, low speed carding cylinder rotation speed 300r / min, to remove short fibers and impurities; Drawing process: Two-stage drawing, roller spacing of 18*20mm, total draft ratio of 7.5 times, drawing speed of 100m / min, to ensure uniform cooked strips without breakage; Roving process: roving weight is 5.2g / 10m, roller speed is 180r / min, to produce uniform and smooth blended roving.

[0044] (3) Ring spinning machine to produce slub yarn Using a conventional ring spinning machine equipped with a CNC slub joint electrical control system, mulberry silk and cashmere slub yarn is spun. The slub joint parameters of the slub yarn are precisely controlled, and the entire spinning process is carried out with low tension and low draft. The specific process parameters are as follows: Total draft ratio of fine yarn: 15.5 times; Spinning twist: 750T / m, twist direction Z twist, to ensure that the fibers in the large belly section do not loosen or fall off; Speed: 130r / min; Slub parameter settings: base yarn 32NM / 1, slub length 12~14cm, ratio 2.8, pitch 25cm-45cm; Air ring tension: keep the ring, spindle, and guide hook concentric to ensure stable air ring shape and avoid fiber stretching and breakage and slub deformation.

[0045] After spinning, a single yarn with slub joints made of mulberry silk and cashmere is obtained. The slub joints are evenly distributed, full and fluffy, without broken ends or slippage.

[0046] (4) Winding and cleaning defects The electronic yarn clearer is used for winding at a speed of 500m / min. It removes excessively long and thick sections while preserving the original slub structure of the thick yarn. This prevents the collapse and flattening of the thick sections, resulting in a neat and conical yarn tube, which facilitates subsequent weaving.

[0047] (5) Low-temperature steaming and setting of yarn cones The wound, slub-shaped yarn undergoes a low-temperature setting process at 50℃ for 30 minutes. This eliminates internal stress in the yarn, stabilizes the slub shape, and ensures straight, braid-free yarn during webbing production. Figure 1 As shown.

[0048] (6) Low-tension woven ribbon yarn The shaped, slub-joint yarn is fed directly into a needle-tube weaving machine to gently weave a ribbon yarn. The entire process is carried out with zero pressure and low tension, preserving the three-dimensional texture of the slub joint. Weaving machine needle pitch: 2.0mm, 12-needle cylinder, 3 needles; Yarn feeding tension: 0.35cN / tex, extremely low tension feeding, no stretching or squeezing of slubs; Webbing speed: 320 r / min; Strap specifications: Finished product width 5.5mm, edges are neatly sealed, no curling or frayed edges; Weaving structure: Weft knitting structure, which does not compress the protruding parts of the belly, and fully preserves the three-dimensional texture of the bamboo joint.

[0049] (7) Finished product shaping process After the webbing is completed, it is sent to a setting device and set at a low temperature of 40℃ for 25 minutes to obtain the final product, the belly band yarn, with a yarn yield of 98.5%. Figure 2 As shown.

[0050] The technical requirements and measured indicators of the finished belly band yarn are shown in Table 2.

[0051] Table 2 Technical requirements and measured indicators of finished belly band yarn

[0052] Example 2 A method for preparing a mulberry silk and cashmere belly band yarn includes the following steps: Raw material ratio: 40% combed cashmere, 60% chopped mulberry silk fibers; Process parameters: In step (3), the base yarn is 36NM / 1, the length of the large section is 10-16cm, and the spinning twist is 810T / m. In step (6), the finished weave width is 5.0mm.

[0053] The remaining production process parameters are consistent with those in Example 1. The finished product is light, thin and smooth, suitable for use with light and high-end fabrics in spring and summer; the yarn yield reaches 97.5%.

[0054] The technical requirements and measured indicators of the finished belly band yarn are shown in Table 3.

[0055] Table 3 Technical requirements and measured indicators of finished belly band yarn

[0056] Example 3 A method for preparing a mulberry silk and cashmere belly band yarn includes the following steps: Raw material ratio: 36% combed cashmere, 64% chopped mulberry silk fibers; Process parameters: In step (3), the base yarn is 24NM / 1, the length of the large section is 11-15cm, and the spinning twist is 700T / m. In step (6), the finished weave width is 7.5mm.

[0057] The remaining production process parameters are consistent with those in Example 1, resulting in better warmth retention of the finished product, making it suitable for use in high-end autumn and winter clothing fabrics; the yarn yield reaches 98%.

[0058] The technical requirements and measured indicators of the finished belly band yarn are shown in Table 4 below.

[0059] Table 4 Technical requirements and measured indicators of finished belly band yarn

[0060] By comparing the above parameters, we can see that the preparation process of the ribbon yarn, the curing of raw materials, the low-temperature setting of single yarn, the feeding tension of the ribbon yarn, and the twist of the slub yarn are all key factors affecting the internal and external quality of the finished ribbon yarn. We need to continuously optimize and accumulate experience to ensure the quality of the ribbon yarn.

[0061] Comparative Example 1 A method for preparing mulberry silk and cashmere belly yarn includes the following steps: Raw material ratio: 15% combed cashmere, 85% chopped mulberry silk fibers; 1. Raw material preparation → wool conditioning → wool combing / cotton combing → drawing → roving → twisting machine → self-winding drum.

[0062] 2. The twisting machine adopts a three-way feeding structure: Core yarn: 36NM / 1*2 continuous uniform output is added to form the yarn skeleton; Decorative yarn (coarse yarn): Three roller servo speed change overfeed, instantaneously feeding a large amount of fiber to form large belly and thick sections; Bonding yarn: Hollow spindles rotate at high speed, wrapping around the outer layer of the decorative yarn to fix the large belly shape. 36NM / 1 yarn is supplied by hollow spindle bobbins as the bonding yarn; The core yarn continues to move, while the decorative yarn is intermittently overfed to create a large belly shape, and hollow spindle-wrapped yarn is used for shaping; the twist is uniform throughout; the fibers inside the large belly are loose. It is not suitable for blends with a high proportion of mulberry silk and combed cashmere.

[0063] 3. Process parameters Belly length: controlled by overfeeding duration; Interval: The time interval between two overfeeding segments; Control mode: Primarily random mode (random time output); Base yarn length 1.0; Belly section length 3 (determines belly thickness ratio). Hollow spindle speed 6000, 560 twist untwisting coefficient 0.48, belly section draft ratio 8 / 8 / 8 / 8 / 8, belly section time 0.28 / 0.31 / 0.35 / 0.38 / 0.32, flat yarn draft ratio 19.8 / 19.8 / 19.8 / 19.8 / 19.8, flat yarn time 0.95 / 1 / 0.97 / 1.03 / 0.98, random time 0.15 / 0 / 0.3 / 0 / 0.4; Yarn twist: 290T / m, uniform twist throughout, no segmented twisting of base yarn or bulk yarn; Disadvantages: There is a lot of fiber accumulation in the large belly area, insufficient twist in the thicker nodes, and the fibers are loose, making them very easy to slip and collapse under stress.

[0064] 4. Molding characteristics: The large belly structure is formed by the accumulation of decorative yarns on the outside of the core yarn, which are bound by the outer layer of wrapping yarn; after external stretching, weaving compression, and washing, the accumulated fibers are prone to displacement, and the three-dimensional effect of the large belly is reduced.

[0065] 5. Self-winding: Direct winding, no low-temperature steaming or pre-forming required; yarn internal stress is permanently retained.

[0066] 6. Suitable for low-cost mass production of chemical fibers, cotton yarn, and ordinary wool; The bamboo joint / belly parameters are randomly generated, resulting in poor consistency in length, spacing, and thickness, with a uniformity of ≤75%. 7. The structure is a three-layer structure of "core + decoration + outer yarn", which feels stiff and lacks the soft and translucent texture of natural fibers; it cannot be used with long mulberry silk fibers + high cashmere content: the silk is prone to splitting and breaking, and there is serious hair loss. 8. Poor pilling resistance (grade 1-2), fibers are easily detached from the large belly area, and the texture quickly flattens after washing; the yarn continuously rubs against the large belly during weaving, and the breakage rate of high-grade velvet blended varieties is extremely high; poor spinnability, and the yarn yield is 96%.

[0067] The specifications and measured parameters of traditional finished yarn are shown in Table 5 below.

[0068] Table 5. Specifications and Measured Specifications of Traditional Finished Belly Yarn

[0069] Comparative Example 2 The difference from Comparative Example 1 is that Raw material ratio: 40% combed cashmere, 60% chopped mulberry silk fibers; Process parameters: In step (3), the length of the large belly is controlled by the duration of overfeeding; Interval: The time interval between two overfeeding segments; Control mode: Primarily random mode (random time output); Base yarn length 1.1 times; Belly section length 3.2 times (determines belly thickness ratio). Hollow spindle speed 5500, 530 twist untwisting coefficient 0.48, belly section draft ratio 7.5 / 7.5 / ​​7.5 / 7.5 / 7.5, belly section time 0.31 / 0.35 / 0.38 / 0.4 / 0.33, flat yarn draft ratio 19.5 / 19.5 / 19.5 / 19.5 / 19.5, flat yarn time 0.95 / 1 / 0.97 / 1.03 / 0.98, random time 0.15 / 0 / 0.3 / 0 / 0.4; Yarn twist: 275T / m, uniform twist throughout, cannot be added to the base yarn or the bulk yarn in sections; poor spinnability.

[0070] The remaining production process parameters are consistent with those of Comparative Example 1. The finished product is lightweight and thin, suitable for use with lightweight high-end fabrics in spring and summer; the yarn yield is 96.5%.

[0071] The specifications and measured parameters of traditional finished yarn are shown in Table 6 below.

[0072] Table 6. Specifications and Measured Specifications of Traditional Finished Bellyband Yarn

[0073] Comparative Example 3 The difference from Comparative Example 1 is: Raw material ratio: 36% combed cashmere and 64% chopped mulberry silk fibers; Process parameters: In step (3): Belly length: controlled by overfeeding duration; Interval: The time interval between two overfeeding segments; Control mode: Primarily random mode (random time output); Base yarn length 1.1 times; Belly section length 3.2 times (determines belly thickness ratio). Hollow spindle speed 5500, 640 twist untwisting coefficient 0.5, belly section draft ratio 7.5 / 7.5 / 7.5 / 7.5 / 7.5, belly section time 0.31 / 0.35 / 0.38 / 0.4 / 0.33, flat yarn draft ratio 20.3 / 20.3 / 20.3 / 20.3 / 20.3, flat yarn time 0.99 / 1.02 / 1.01 / 1.03 / 1.02, random time 0.15 / 0 / 0.3 / 0 / 0.4; Yarn twist: 320T / m, uniform twist throughout, cannot be added to the base yarn or the bulk yarn in sections; poor spinnability.

[0074] The remaining production process parameters are consistent with those of Comparative Example 1. The finished product is lightweight and thin, suitable for use with lightweight high-end fabrics in spring and summer; the yarn yield is 95%.

[0075] The specifications and measured parameters of traditional finished yarn are shown in Table 7 below.

[0076] Table 7. Specifications and Measured Specifications of Traditional Finished Bellyband Yarn

[0077] Based on the comparison of the above parameters: the traditional finished yarn preparation process has poor compatibility between cashmere and mulberry silk fibers, and is limited by equipment technology. Yarn produced by the traditional process has problems such as stiffness, flat texture, uneven edges, easy curling and fraying, high equipment requirements, difficulty in mass production and promotion, and unstable product quality.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a mulberry silk and cashmere belly-length yarn, characterized in that: Includes the following steps: Combed cashmere and mulberry silk are mixed in a mass ratio of 10-40:60-90, and then subjected to wool pretreatment and conditioning treatment. The blended fibers, after undergoing conditioning treatment, are sequentially processed through opening, carding, drawing, and roving to obtain roving; The roving is spun into a large-belly yarn using a ring spinning machine with CNC control. The draft ratio during the spinning process is 11-16 times, the base yarn is 20-36 NM / 1, the large-belly section length is 10-16 cm, the ratio is 2.5-3.2 times, the spacing is 25-48 cm, the spinning twist is 610-824 T / m, the twist direction is Z twist, and the spinning speed is 120-140 r / min. After the yarn with a large belly is wound and cleaned, it undergoes a setting process; The shaped belly yarn is woven into ribbon yarn, with a yarn feeding tension of 0.3-0.4 cN / tex; After weaving, the yarn is set to obtain the large belly-shaped yarn.

2. The method for preparing the mulberry silk and cashmere belly-length yarn according to claim 1, characterized in that: The mass ratio of combed cashmere to mulberry silk is 10-20:90-80; During the wool pretreatment process, the wool-refining auxiliaries added account for 6%-8% of the total mass of the raw materials.

3. The method for preparing the mulberry silk and cashmere belly-length yarn according to claim 1, characterized in that: The fineness of the combed cashmere is 15.5-16.5μm and the fiber length is 34-36mm; or, the fiber length of the mulberry silk is 38-40mm.

4. The method for preparing the mulberry silk and cashmere belly-length yarn according to claim 1, characterized in that: The fiber moisture content during the conditioning process is 22%-24%, the conditioning temperature is 25-32℃, the relative humidity of the environment is 65%-70%, and the conditioning time is 24-36 hours.

5. The method for preparing the mulberry silk and cashmere belly-length yarn according to claim 1, characterized in that: The opening speed is 400~450 r / min; Alternatively, in the carding process, the sliver weight is 16-18g / 5m; Alternatively, in the drawing process, two drawing passes are performed with a roller spacing of 18*20mm, a total draft ratio of 6.5~7.5 times, and a drawing speed of 80-120m / min.

6. The method for preparing the mulberry silk and cashmere belly-length yarn according to claim 1, characterized in that: In the roving process, the roving weight is 4.5~5.5g / 10m, and the roller speed is 180~200r / min.

7. The method for preparing the mulberry silk and cashmere belly-length yarn according to claim 1, characterized in that: During the winding and defect removal process of the large-belly yarn, the machine speed is 480~520m / min.

8. The method for preparing mulberry silk and cashmere belly-length yarn according to claim 1, characterized in that: During the process of weaving the tape yarn from the shaped belly yarn, the stitch length is 1.2-2.0mm, the number of needles is 3-6, the weaving speed is 300-350r / min, the finished tape width is 4-8mm, and the weaving structure adopts a weft knitting structure.

9. The method for preparing the mulberry silk and cashmere belly-length yarn according to claim 1, characterized in that: Place the woven ribbon yarn in an environment of 45-55℃ for 20-30 minutes to set, and you will get the finished belly-length ribbon yarn.

10. A type of mulberry silk and cashmere belly-length yarn, characterized in that: It is prepared by any one of the preparation methods described in claims 1-9.

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