Composite spinning method and composite yarn

Abstract

The invention provides a composite spinning method and composite yarn, and the method comprises the following steps: a, mixing cashmere strips in a sliver mixing machine, and drafting the cashmere strips through a roving frame to form cashmere roving; b, feeding the two cashmere rough yarns into a spinning frame in parallel; c, two synthetic fiber filaments pass through a spinning frame, and a wrapping path is formed on the outer side of the cashmere roving; d, the cashmere roving and the synthetic fiber filaments form two pre-twisting triangular areas on the outer side of the spinning frame, the cashmere roving and the synthetic fiber filaments are preliminarily wrapped to form AB yarn, the AB yarn is guided into a final twisting triangular area to be twisted, and resultant yarn is formed. According to the composite spinning method and the composite yarn provided by the invention, the cashmere fibers and the synthetic fibers are spun to form the composite yarn, and the composite yarn not only has soft and light touch feeling, but also has certain strength and elasticity, and also has good durability and anti-pollution capability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textiles, in particular to a composite spinning method and a composite yarn. BACKGROUND

[0002] Traditional cashmere yarn has many limitations in application. Pure cashmere fabric has poor wear resistance, which is difficult to meet the needs of frequent friction in outdoor sports. The low wrapping rate leads to poor structural stability. The low anti-pilling grade affects the appearance and service life of the product. In addition, the short and low-strength characteristics of cashmere fibers also pose challenges to processing, limiting their application in more fields. When combining natural fibers with synthetic fibers, the traditional spinning process is difficult to effectively balance the soft touch, warmth, and strength, wear resistance and other properties, and an innovative spinning method is needed to solve these problems. SUMMARY

[0003] The present application provides a composite spinning method and a composite yarn to solve the problems in the prior art.

[0004] According to a first aspect of the present application, the present application provides a composite spinning method, comprising the following steps: Step a: mixing cashmere slivers in a sliver mixing machine and stretching the cashmere slivers through a roving machine to form cashmere roving; Step b: feeding two cashmere rovings into a spinning machine in parallel; Step c: feeding two synthetic fiber filaments through the spinning machine to form a wrapping path outside the cashmere roving; Step d: the cashmere roving and the synthetic fiber filaments form two pre-twist triangle zones outside the spinning machine, so that the cashmere roving and the synthetic fiber filaments are preliminarily wrapped to form AB yarn, and the AB yarn is introduced into a final twist triangle zone for twisting to form a finished yarn.

[0005] In one embodiment of the present application, the composite spinning method further comprises a pretreatment step, the pretreatment step comprising: S1: grading and selecting cashmere fibers with a fiber length of 32 mm or more; S2: washing the cashmere fibers graded in step S1 with water and a cleaning agent; S3: adding an antistatic agent and a wool oil to the cashmere fibers treated in step S2 for wooling treatment.

[0006] In one embodiment of the present application, after the pretreatment step, further comprising: S4: opening the cashmere fibers treated in step S3 by a carding machine; S5: further carding the cashmere fibers treated in step S4 by a combing machine; S6: carding the cashmere fibers after the step S5 by a gill box to form the cashmere sliver.

[0007] In one embodiment of the present disclosure, after the step d, a post-processing step is further included, the post-processing step comprises: Step e: winding the yarn into a tube and removing the defects of the yarn; Step f: combining at least two yarns in parallel to form a strand; Step g: twisting the strand.

[0008] In one embodiment of the present disclosure, the tension of the synthetic fiber filament in the pre-twist triangular zone is 17 CN to 23 CN; The tension of the cashmere roving in the pre-twist triangular zone is 12 CN to 14 CN.

[0009] In one embodiment of the present disclosure, the twist of the AB yarn is 670 T / M to 730 T / M; The twist of the yarn is 870 T / M to 930 T / M.

[0010] In one embodiment of the present disclosure, the draft ratio of the spinning frame in the step b and the step c is 18-22; the front roller linear speed is 670 m / min to 730 m / min.

[0011] In one embodiment of the present disclosure, the synthetic fiber filament is nylon, the specification is 20D / 12F, DTY; The fiber length of the cashmere roving is ≥32 mm, and the fineness is 13 μm to 15 μm.

[0012] According to a second aspect of the present disclosure, a composite yarn is provided, the composite yarn is a composite yarn obtained by the composite spinning method as described above.

[0013] In one embodiment of the present disclosure, the composite yarn is a three-layer composite structure, comprising a core layer, an intermediate layer and a surface layer, wherein the core layer is a cashmere roving, the intermediate layer is the AB yarn, and the surface layer is the yarn.

[0014] The composite spinning method and the composite yarn provided by the present disclosure spin the cashmere fibers and the synthetic fibers to form a composite yarn, the composite yarn obtained by spinning has both soft and light touch and certain strength and elasticity, and also has good durability and stain resistance.

[0015] Other features of the present disclosure and its advantages will become more apparent from the following detailed description of exemplary embodiments thereof with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0017] Figure 1 is a flow chart of a composite spinning method provided by one embodiment of the present disclosure; Figure 2 1 is a schematic structural diagram of AB yarn provided by an embodiment of the present disclosure; Figure 3 Schematic diagram of the structure of the composite yarn provided in one embodiment of the present disclosure.

[0018] 1- Nylon filament; 2- Cashmere roving. DETAILED DESCRIPTION

[0019] In order to make the invention purpose, technical solution and beneficial technical effect of this application clearer, this application is described in detail below with reference to specific embodiments. It should be understood that the embodiments described in this specification are only for explaining this application and are not intended to limit this application.

[0020] For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, and likewise, any upper limit can be combined with any other upper limit to form an unspecified range. In addition, although not explicitly stated, each point or individual value between the endpoints of a range is included in the range. Thus, each point or individual value can serve as its own lower limit or upper limit and be combined with any other point or individual value, or with other lower limits or upper limits, to form an unspecified range.

[0021] In the description of this article, it should be noted that, unless otherwise specified, “above” and “below” include the number itself, and “several” in “one or several” means two or more.

[0022] The above summary of the invention of this application is not intended to describe every disclosed embodiment or every implementation in this application. The following description more specifically illustrates exemplary embodiments. In many places throughout the application, guidance is provided by a series of examples, which can be used in various combinations. In each example, the enumeration is intended only as a representative group and should not be construed as exhaustive.

[0023] like Figure 1 As shown, according to the first aspect of the present disclosure, the present disclosure provides a composite spinning method, comprising the following steps: Step a: mixing cashmere slivers in a blending machine, and drafting the cashmere slivers through a roving machine to form cashmere roving.

[0024] Specifically, in step a, the cashmere sliver is first fed into a sliver mixer for thorough mixing. The sliver mixer mainly repeatedly combines, loosens and combs the multiple fed cashmere slivers through multiple parallel rollers or grooves inside, and uses airflow assistance to make cashmere fibers of different batches or characteristics fully and uniformly interlaced in length and cross section, so as to reduce subsequent yarn unevenness and color difference.

[0025] After the cashmere sliver is mixed uniformly, it is immediately sent to a roving machine for staged drafting treatment. The roving machine controls the drafting zone composed of three roller groups with different rotating speeds in front, middle and back to apply tension to the fed cashmere sliver. The first drafting is set to a high range of 6 to 8 times. The main purpose of the high-strength stretching in this stage is to significantly reduce the linear density of the cashmere fiber bundle and force the fibers to relatively slide along the sliver axis, straighten and arrange in parallel, greatly adjust the arrangement density of the fibers, and lay a foundation for the uniformity of subsequent yarn formation.

[0026] After the high-drafting is completed, the cashmere fiber bundle then enters the second drafting in the roving machine. The drafting multiple is reduced to 3.5 to 4.2 in this stage. While the fiber arrangement is maintained by moderate stretching, the cashmere fiber bundle is applied with a preliminary twist at the end of the drafting zone, so that the necessary frictional holding force between the cashmere fibers is generated, thereby giving the cashmere roving certain strength and sufficient tightness, ensuring the stability of the cashmere roving structure. Finally, the cashmere roving is wound into a roving package that meets the feeding requirements of the spinning machine for the next spinning process.

[0027] Step b: feeding two cashmere rovings into the spinning machine in parallel.

[0028] Specifically, in step b, two cashmere rovings are fed into the spinning machine in parallel. In the feeding part of the spinning machine, the two rovings are unwound from their respective roving packages, pass through the guide rod or tension device to maintain a certain unwinding tension, and then are guided to the guide horn behind the back roller. The horn is provided with a partition groove or double-hole structure to ensure that the two cashmere rovings are fed in parallel and separated from each other. The center distance between the two rovings is controlled to be 3 to 5 mm, and in this embodiment, it is set to 4 mm to prevent accidental crossing, entanglement or overlapping of the rovings during feeding, and also helps the two cashmere rovings to maintain their own independent positions and uniformity of tension, thereby laying a foundation for the subsequent process.

[0029] Step c: forming a wrapping path for two synthetic fiber filaments outside the cashmere roving through the spinning machine.

[0030] In step c, two synthetic fiber filaments are introduced through the guide mechanism of the spinning frame, and the two synthetic fiber filaments are guided to the outer side of the two parallel fed cashmere rovings respectively, and the center distance between the two synthetic fiber filaments is set to 7-9 mm, and in this embodiment, it is set to 8 mm, which not only ensures the accurate positioning of the synthetic fiber filaments in the pre / terminal twisting, but also maximizes the softness and warmth of cashmere and the toughness and wear resistance of synthetic fiber filaments through spatial isolation, overcoming the inherent defects of traditional cashmere yarn.

[0031] After drafting, the cashmere sliver and the synthetic fiber filaments enter the twisting triangle area together. Under the action of twisting, the two synthetic fiber filaments are evenly wrapped around the outside of the already drafted cashmere core in a spiral manner, thereby forming a stable and constant distance wrapping path. This structure effectively utilizes the high strength of the synthetic fiber filaments, enhances the wear resistance of the final composite yarn, and significantly reduces the generation of cashmere fiber hair.

[0032] Step d: The cashmere roving and the synthetic fiber filaments form two pre-twist triangle areas on the outside of the spinning frame, so that the cashmere roving and the synthetic fiber filaments are preliminarily wrapped to form AB yarns, and the AB yarns are introduced into the final twist triangle area for twisting to form the finished yarn.

[0033] In step d, the cashmere roving and the two synthetic fiber filaments are separated to form two independent pre-twist triangle areas on the outside of the spinning frame. In these two pre-twist triangle areas, the synthetic fiber filaments actively approach the cashmere roving and preliminarily spiral wrap around the cashmere roving in each pre-twist triangle area, thereby forming AB yarn structures with relatively stable structures and synthetic fiber filaments preliminarily wrapped around the cashmere core on the outer layer before entering the final twist area, i.e. each AB yarn is composed of a cashmere roving core and a synthetic fiber filament wrapped around it. Further, the two preliminarily formed AB yarns are guided and converged to the final twist triangle area. In the final twist triangle area, the high-speed rotating spindle applies stronger final twisting action to the whole of the two AB yarns, which on the one hand makes the two AB yarns tightly twisted together, significantly optimizes the overall tightness of the finished yarn, greatly reduces the hair shedding of cashmere fibers, and on the other hand greatly enhances the overall strength, wear resistance and structural stability of the yarn, finally forming a composite structure finished yarn with excellent appearance of less hair, high strength and good wear resistance.

[0034] In one embodiment of the present disclosure, the composite spinning method further comprises a pretreatment step, and the pretreatment step comprises: S1: Grade the cashmere fibers with a fiber length of ≥32 mm.

[0035] Specifically, in the present embodiment, the opened cashmere fibers can be placed on a special fiber length analyzer, or manually sorted by experienced workers. Through the instrument or manual method, the cashmere fiber bundles are combed parallel and measured and compared according to their natural length, and all short fibers with a length less than 32 mm are removed. Longer cashmere fibers can withstand greater mechanical stress in subsequent high-draft and twisting processes, effectively reducing fiber breakage and lint, ensuring that cashmere fibers are more parallel and straight in the yarn, thereby significantly improving the strength and evenness of the final yarn, and reducing the generation of hair, laying the foundation for producing high-quality cashmere blended yarns with excellent hair style.

[0036] S2: washing the cashmere fibers graded in step S1 with water and a cleaning agent; After the cashmere fibers with a fiber length of 32 mm or more are screened in step S1, washing pretreatment is immediately performed. Specifically, the graded cashmere fibers are placed in a professional washing trough or washing machine, and are washed using softened water, which has low calcium and magnesium ion hardness, can reduce damage to cashmere fibers, and is added with a neutral or weakly alkaline special cashmere cleaning agent, which is usually a non-ionic surfactant, can avoid damaging the natural scale layer of cashmere fibers, and the concentration of the cleaning agent is matched according to the degree of fiber contamination. During the washing process, gentle mechanical stirring or water circulation can be used for washing to avoid severe rubbing that causes cashmere fibers to felt, so that the cleaning liquid can fully penetrate the cashmere fiber bundles, effectively dissolving and removing natural oils, sweat stains, dust, plant impurities and water-soluble dirt attached to the cashmere fibers. The washing time is set according to the initial cleanliness of the fibers. After washing, most of the water is removed by low-speed centrifugation, which can reduce damage to cashmere fibers, and the cleaned cashmere fibers are finally dried, which effectively removes dirt while maximizing the protection of the natural elasticity, softness and scale integrity of cashmere fibers, providing a clean and physically excellent raw material basis for subsequent spinning processes.

[0037] S3: adding an antistatic agent and a wool oil to the cashmere fibers treated in step S2, and performing wool blending treatment.

[0038] After the cleaning and drying in step S2, the wool fibers are immediately subjected to a carding process in step S3. Specifically, the clean wool fibers are fed into a carding machine, in which the wool fibers are mechanically opened and tumbled, and an antistatic agent, typically a high-efficiency, easily emulsified anionic or nonionic surfactant such as an alkyl phosphate ester salt or a polyoxyethylene ether complex, is uniformly sprayed onto the wool fibers to effectively neutralize the surface resistance of the fibers. At the same time, carding oil is added, which forms a uniform lubricating film on the surface of the fibers, increasing the cohesion between the fibers, reducing friction damage, and improving the flexibility and spinnability of the fibers, obtaining wool fiber raw materials with good opening, high fiber separation degree, excellent antistatic performance, and appropriate friction characteristics, providing a stable processing basis for subsequent slivering and spinning processes.

[0039] In one embodiment of the present disclosure, after the pre-treatment step, further comprising: S4: opening the wool fibers treated in step S3 by a carding machine.

[0040] Specifically, after the carding process in step S3 is completed, the wool fibers are fed into a carding machine. The wool fibers first enter a pre-combing section to initially break up the fiber clumps. Then the wool fibers are transferred to a main combing zone, which includes a high-speed rotating large cylinder, a plurality of pairs of working rollers and stripping rollers arranged around the cylinder, and the cylinder clothing carries the fibers at high speed, which meets the low-speed counter-rotating working roller clothing to form a strong combing action. The dense steel needles repeatedly penetrate the fiber layer, carefully opening, combing, and separating the fiber bundles into single or small bundles, and removing residual small impurities and short fibers; at the same time, the stripping rollers strip the fibers on the working rollers and return them to the cylinder for further combing to ensure full opening; after repeated fine combing in the main combing zone, the fibers are condensed and stripped from the cylinder by a doffer to form a thin and uniform fiber web in which the fibers are basically in single parallel arrangement; the fiber web is drawn out by an output roller and slightly compacted by a pair of compression rollers to maintain the structure, and finally wound into a sliver can or laid into a pile for use in the next process, fully preparing for the subsequent scouring process to efficiently remove short fibers and impurities and further improve the parallel straightness of the wool fibers.

[0041] S5: further combing the wool fibers treated in step S4 by a carding machine to obtain wool fiber slivers.

[0042] Further, after the cashmere fibers are opened into a cashmere fiber web in step S4, the cashmere fibers are combed by a straight combing machine to further improve the quality. Specifically, first, the slivering needle combing is performed, and a plurality of cashmere fiber slivers from the opening process are fed into the needle combing machine in parallel, and in the needle combing zone, the drafting device composed of front and rear rollers slightly drafts, and at the same time, the densely arranged needle plate repeatedly penetrates, combs and mixes the fiber layer, eliminates the transverse connection between the fibers and significantly improves the longitudinal structural uniformity of the cashmere fiber sliver, to provide the cashmere fiber sliver with uniform sliver evenness and preliminarily straightened fibers for efficient feeding of the combing machine.

[0043] The slivered cashmere fiber is strongly combed by the combing machine to completely remove the residual short fibers, small impurities, fiber knots and insufficiently opened fiber bundles, and at the same time, supplementary combing is performed. Finally, high-quality combed cashmere slivers with more concentrated length distribution, lower short fiber content, less impurity content and excellent parallel straightness are output, laying the raw material foundation for subsequent spinning of high-quality cashmere yarns with high fineness, high strength and low hairiness.

[0044] S6: The cashmere sliver after step S5 is combed by a needle combing machine to form a cashmere sliver.

[0045] After the combing in step S5 is completed, the combed cashmere sliver is sequentially and progressively combed by 3 to 4 needle combing machines to finally form a cashmere sliver meeting the requirements. Specifically, the combed cashmere fiber sliver is drawn out from the sliver can, a plurality of slivers are fed into the guide frame of the first needle combing machine in parallel, and after being held by the rear roller, the fiber layer is densely penetrated and combed in the drafting zone, effectively separating the fibers, eliminating the hooks, improving the parallel straightness, and significantly improving the fiber mixing uniformity through the combination of a plurality of slivers. The drafted cashmere fiber bundle is output by the front roller, gathered by the trumpet, and then wound into the output sliver can by the sliver winder. The second needle combing processes the output cashmere fiber sliver of the first needle combing in a similar process, further strengthens the combing effect, and focuses on improving the sliver evenness and weight unevenness of the fiber sliver. The subsequent third or fourth needle combing focuses on precise control, and the drafting multiple is gradually increased to 1.8 to 2 times to ensure sufficient combing and mixing of the fibers. The finally output cashmere sliver has good fiber parallel straightness, excellent sliver evenness, strict weight consistency and sufficient fiber mixing uniformity, and has a compact structure and a smooth surface, meeting the requirements of the subsequent sliver mixing and roving processes for the feeding sliver.

[0046] In one embodiment of the present disclosure, after step d, a post-processing step is further included, and the post-processing step includes: Step e: winding the yarn into a cylinder and removing defects of the yarn.

[0047] Specifically, the yarns are first cleaned of large impurities by a preliminary clearer, and then enter the core electronic clearer to remove defects on the yarns. Finally, under the control of the winding system, the yarns are cross-wound onto conical or cylindrical bobbins at a predetermined speed, forming a large-capacity, structurally stable, and smooth-drawing bobbin. The final output of the bobbin not only significantly improves the smoothness of the yarn, but also lays a solid foundation for subsequent efficient weaving with its excellent package shape.

[0048] Step f: merging the at least two yarns in parallel to form a strand.

[0049] Specifically, two or more yarns are selected, and each enters the tension control system through an independent guide hook to ensure that the multiple yarns have consistent tension before merging, which is the basis for obtaining a uniform strand. The single yarns with balanced tension are then guided to a merging guide, which forces them to be closely and parallelly arranged in space and to merge into a bundle under zero draft; this bundle of parallelly arranged single yarns is then further integrated through a bunching horn, and is then cross-wound onto a conical or cylindrical bobbin under the traction of the winding mechanism, forming a structurally compact and smooth-drawing folded yarn bobbin. The core role of the folded yarn is to significantly improve the evenness of the final strand, increase the overall strength, and enhance the wear resistance by merging multiple single yarns, and to provide a structurally stable and tension-uniform feeding basis for subsequent processes.

[0050] Step g: twisting the strand.

[0051] Specifically, the merged strand is sent to a twisting machine to apply twist to the strand, increasing its strength and stability. The twisting process produces strong spiral entanglement between the fibers in the single yarns and between the single yarns in the strand, significantly increasing the breaking strength, wear resistance, and structural stability of the strand. Uniform distribution of the twist optimizes the luster and hand feel of the strand, and finally produces a twisted strand that meets the stringent requirements in strength, appearance, and processing performance.

[0052] In one embodiment of the present disclosure, the tension of the synthetic fiber filaments in the pre-twist triangle zone is 17 CN to 23 CN; the tension of the cashmere roving in the pre-twist triangle zone is 12 CN to 14 CN.

[0053] In the pre-twist triangle zone, the tension of the synthetic fiber filament is controlled in a higher range of 17 CN to 23 CN, while the tension of the cashmere roving is maintained in a lower range of 12 CN to 14 CN; this significant tension difference is the core technical condition to achieve effective primary wrapping. Specifically, an electronic tensioner is arranged on the filament path to monitor and dynamically adjust the pressure of the guide hook or tension disc in real time, ensuring that the synthetic fiber filament is always in a high tension state and maintains a tight straight shape in the pre-twist triangle zone; at the same time, the tension of the cashmere roving is stably limited at a low level, and the synthetic fiber filament with high tension actively approaches the relaxed cashmere roving radially and spirally sinks, forming a tight and stable primary wrapping structure. If the tension difference is insufficient, the synthetic fiber filament wrapping will be loose and uneven; if the tension difference is too large or the tension of the cashmere roving exceeds the standard, it is easy to cause the cashmere fiber to be stretched too much or even broken, resulting in hairiness or weak joints.

[0054] In one embodiment of the present disclosure, the twist of the AB yarn is 670 T / M to 730 T / M; the twist of the finished yarn is 870 T / M to 930 T / M.

[0055] Specifically, in this embodiment, the AB yarn formed by the pre-twist triangle zone is set to a twist of 700 T / M, while the final finished yarn output by the final twist triangle zone is applied with a higher twist of 900 T / M, and the AB yarn twist level is designed to ensure that the synthetic fiber filament forms a tight and uniform spiral wrapping around the cashmere core, providing the necessary primary holding force and anti-accidental stretching ability, while avoiding excessive twisting of the cashmere fiber, stiff yarn body or deterioration of hand feeling due to too high twist. The high twist of 900 T / M of the finished yarn can strongly twist the two primary wrapped AB yarns in the final twist zone, significantly increase the radial pressure and friction contact area between the fibers, thereby greatly improving the breaking strength, wear resistance and structural tightness of the finished yarn, while efficiently inhibiting the escape of cashmere fiber hairiness.

[0056] In one embodiment of the present disclosure, the draft ratio of the spinning frame in steps b and c is 18-22; the front roller linear speed is 670 m / min to 730 m / min.

[0057] In step b and step c, the draw ratio of the spinning frame applied to the cashmere roving is set to 20, which is a high draw ratio that forces the cashmere fibers to generate sufficient relative slip and rearrangement in the spinning frame, significantly improving the parallel straightness of the fibers, reducing hooks and curling, which is crucial for reducing hairiness generation and improving yarn strength when subsequently compounded and twisted with synthetic fiber filaments. The front roller linear speed of 700 m / min ensures the efficiency of the draft while meeting the needs of large-scale production. The synergistic setting of these two parameters fully adapts to the spinning limit of fine cashmere, effectively reducing yarn evenness and suppressing hairiness generation by maximizing fiber utilization and production efficiency, laying the process foundation for the final output of high-quality composite yarns.

[0058] In one embodiment of the present disclosure, the synthetic fiber filaments are nylon with a specification of 20D / 12F, DTY; the cashmere roving has a fiber length of ≥32 mm and a fineness of 13-15 μm.

[0059] The synthetic fiber filaments are nylon with a specification of 20D / 12F, DTY, where "20D" means that the fineness is 20 denier (i.e., 9000 meters of fiber weighs 20 grams), which belongs to the ultra-fine denier category, giving the yarn lightweight and soft covering properties; "12F" means that the filament is composed of 12 filaments, which improves the flexibility, uniformity of coverage, and wear resistance of the filament; "DTY" (draw textured yarn) means that it has undergone a stretch deformation process, with a three-dimensional crimp structure that significantly enhances the mechanical engagement of the filament with the cashmere fibers, which is a process feature that achieves high wrapping rate and effectively locks the hair, solving the core processing problem of short cashmere fibers and low strength.

[0060] The cashmere roving, on the other hand, is derived from high-quality cashmere fibers with a fiber length of ≥32 mm and a fineness of 14.92 μm. Specifically, the cashmere raw material is Albas white cashmere from the Ordos region of China, which has extremely fine and uniform fineness, with a highly regular nearly circular cross-section. This unique morphological feature gives the cashmere superior softness, lightness, and excellent strength and elastic recovery rate, making the final fabric have both loft and warmth and wear resistance and anti-deformation ability. At the same time, the scale layer on the surface of the cashmere fibers is arranged extremely tightly, with smooth edges, significantly reducing the friction effect between the cashmere fibers, not only reducing damage during spinning, but also giving the fabric a smooth silky touch and soft sheen. In addition, due to the dry and rainy environment of the production area, the amount of impurities attached to the cashmere is greatly reduced, making the raw material have a very low loss rate during washing and significantly improving the yield of finished products.

[0061] On the other hand, the adopted nylon filament is GRS (Global Recycle Standard) certified regenerated nylon, which is derived from waste fishing nets, old carpets or industrial waste treated by chemical depolymerization and repolymerization process, effectively reducing carbon footprint and reducing dependence on petroleum-based raw materials; the regenerated nylon has high strength, excellent wear resistance, heat resistance, oil resistance and chemical resistance, and the DTY processing process gives the nylon filament moderate crimping and bulkiness, which not only significantly enhances the strength, dimensional stability and durability of the yarn and the final product, but also greatly improves the easy care of the fabric (machine washable, anti-pilling, quick drying); the combination of the two realizes the unity of natural luxury and sustainable high performance at the raw material level.

[0062] According to a second aspect of the present disclosure, a composite yarn is provided, which is obtained by the above-mentioned composite spinning method.

[0063] Reference Figure 2 , Figure 3 In one embodiment of the present disclosure, the composite yarn is a three-layer composite structure, including a core layer, an intermediate layer and a surface layer, wherein the core layer is a cashmere roving 2, the intermediate layer is an AB yarn, and the surface layer is a finished yarn.

[0064] Specifically, the three-layer composite structure adopted by the composite yarn: the core layer is composed of cashmere roving 2 with fineness of 14.92 μm and length ≥ 32 mm, which fully utilizes the natural medullary cavity hollow structure and soft touch of cashmere fiber with ultra-fine diameter to provide core warmth and comfort to the yarn; The intermediate layer is an AB yarn structure, that is, the regenerated nylon filament 1 with specification 20D / 12F DTY is wrapped around the outside of the cashmere roving 2 in a tight spiral shape in the pre-twist triangle area. The key role of this layer is to form a strong binding force on the core layer of cashmere roving 2 through the high modulus and high strength characteristics of the nylon filament 1, significantly improving the local strength of the yarn, and greatly inhibiting the accidental slipping and breaking of the core layer fibers in subsequent processing, and giving the yarn good structural stability; The surface layer is the final finished yarn formed in the final twist triangle area, referring to Figure 3 Two AB yarns are strongly twisted, and this high twist action forces the nylon filaments in the intermediate layer to be evenly distributed on the outer periphery of the yarn body, forming a continuous and dense wear-resistant protective layer. The surface layer nylon filament directly bears external friction and stress due to its excellent wear resistance, smooth surface and chemical resistance, effectively protecting the fragile cashmere fibers inside.

[0065] The composite yarn in the embodiment forms a physical barrier through the outer layer of polyamide filaments, and strongly limits the migration of the internal cashmere fibers to the outer layer of the yarn body; meanwhile, the core layer cashmere is firmly locked under the radial pressure of the pre-winding and high twist final twisting of the AB yarn, thereby minimizing the fiber end exposure and sharply reducing the amount of yarn body hair generation, and finally outputting a high-performance composite yarn with soft and sticky touch and warmth of cashmere, high strength and wear resistance of polyamide, easy care, and super low hair high clean appearance.

[0066] Application scenarios Lightweight warmth: The thermal conductivity of cashmere (0.026 W / m·K) is much lower than that of wool, and combined with the tight structure of embedded spinning, the fabric weight can be reduced by 20%-30% under the same warmth effect, suitable for lightweight needs such as mountain climbing. The composite yarn of 20D polyamide + 15 μm cashmere has a CLO value of 0.35, which is better than pure wool yarn (0.28).

[0067] Dynamic strength and wear resistance: The embedding of filaments increases the yarn breaking strength by ≥150% (compared to traditional cashmere yarn), and the Martindale wear resistance test is ≥20,000 times (pure cashmere fabric is usually ≤8,000 times), meeting the reinforcement needs of the friction area of backpacks, elbows, and knees.

[0068] Anti-pilling and hair control: The embedded structure controls the cashmere hair H value to ≤3.0 (traditional cashmere yarn ≥5.5), and the anti-pilling level is ≥3 levels, avoiding the influence of frequent friction pilling on appearance.

[0069] Intelligent temperature control: Replace the polyamide filaments with conductive silver filaments (such as 20D polyamide / silver filament blend), giving anti-static and heat regulation functions, suitable for outdoor environments with large temperature differences.

[0070] High-elastic support: Use T800 elastic filaments as core filaments, and the yarn elastic recovery rate is ≥80%, which can be used for tight mountaineering pants or sports protectors, avoiding the aging problem of traditional spandex.

[0071] Experimental data comparison Average data of 60S single yarn conventional indicators

[0072] Average data of 48S single yarn conventional indicators

[0073] From the above data, it can be clearly seen that the composite yarn of the present application has significant advantages in strength, hair control, uniformity (CV value), and other key indicators compared to traditional wool yarn and ordinary wool and cashmere blended yarn.

[0074] The composite spinning method and the composite yarn provided by the application successfully realize efficient combination of natural cashmere and synthetic fibers through scientific and reasonable selection of raw materials, fine pretreatment process, innovative spinning technology and perfect post-treatment process. The prepared composite yarn has a three-layer composite structure and is excellent in uniformity, strength, wear resistance, anti-pilling property and hair control, and can meet the stringent requirements of high-end fields such as outdoor sports on materials.

[0075] The above has described the embodiments of the application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical application or technical improvement in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the disclosed embodiments. The scope of the application is defined by the appended claims.

Claims

1. A composite spinning method characterized by, The method comprises the following steps: Step a: mixing cashmere slivers in a sliver mixing machine and drafting the cashmere slivers through a roving machine to form cashmere roving; Step b: feeding two cashmere rovings into a spinning frame in parallel; Step c: feeding two synthetic fiber filaments through the spinning frame to form a wrapping path outside the cashmere roving; Step d: forming two pre-twist triangle zones outside the spinning frame for the cashmere roving and the synthetic fiber filaments, so that the cashmere roving and the synthetic fiber filaments are preliminarily wrapped to form AB yarn, and the AB yarn is introduced into a final twist triangle zone for twisting to form finished yarn.

2. The composite spinning process according to claim 1, characterized in that, The method further comprises a pretreatment step, which comprises: S1: grading cashmere fibers with a fiber length of ≥32 mm; S2: washing the cashmere fibers graded in step S1 with water and a cleaning agent; S3: adding an antistatic agent and wool oil to the cashmere fibers treated in step S2 for wooling treatment.

3. The composite spinning process according to claim 2, characterized in that, After the pretreatment step, the method further comprises: S4: opening the cashmere fibers treated in step S3 through a carding machine; S5: further carding the cashmere fibers treated in step S4 through a combing machine; S6: needle punching the cashmere fibers treated in step S5 through a gill box to form the cashmere slivers.

4. The composite spinning process according to claim 1, characterized in that, After the step d, the method further comprises a post-treatment step, which comprises: Step e: winding the finished yarn into a bobbin and removing defects of the finished yarn; Step f: combining at least two finished yarns in parallel to form a strand; Step g: twisting the strand.

5. The composite spinning method according to claim 1, wherein the tension of the synthetic fiber filaments in the pre-twist triangle zone is 17 CN to 23 CN; the tension of the cashmere roving in the pre-twist triangle zone is 12 CN to 14 CN.

6. The composite spinning method according to claim 1, wherein the twist of the AB yarn is 670 T / M to 730 T / M; the twist of the finished yarn is 870 T / M to 930 T / M.

7. The composite spinning method according to claim 1, wherein the draft ratio of the spinning frame in the steps b and c is 18-22; and the front roller linear speed is 670 m / min to 730 m / min.

8. The composite spinning method according to claim 1, wherein the synthetic fiber filaments are polyamide with a specification of 20D / 12F, DTY; the cashmere roving has a fiber length of ≥32 mm and a fineness of 13 μm to 15 μm.

9. A composite yarn, characterized by The composite yarn is a composite yarn obtained by the composite spinning method according to any one of claims 1-8.

10. The composite yarn of claim 9, wherein, The composite yarn has a three-layer composite structure comprising a core layer, an intermediate layer and a surface layer, wherein the core layer is cashmere roving, the intermediate layer is the AB yarn, and the surface layer is the finished yarn.

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