A double core wrapped composite yarn with tight slub style and its spinning process

Abstract

The present application relates to a kind of double core sheath wrapped composite yarn with tight slub style and its spinning process, belong to the field of textile technology.From inside to outside, it includes three-layer composite structure, respectively: inner core layer, the double core structure of one first filament and one elastic filament parallel and combined;Intermediate sheath layer, the sheath layer formed by short fiber being gathered and covered outside the inner core layer by tight spinning technology;Outer wrapping layer, one second filament is wrapped in the intermediate sheath layer outside by spiral filar winding mode;The composite yarn as a whole has a certain regular distribution of slub structure, wherein the yarn diameter of slub part is greater than that of plain yarn part, and the outer wrapping layer is outside the slub yarn.The present application can continuously and stably integrate and spin the yarn with more complex structure and highly composite function on one equipment, realize the double breakthrough of product structure and textile process, obtain the inner core strength and elasticity;The outer wrapping layer not only enhances the slub style, but also increases the light and elasticity.

Description

Technical Field

[0001] This invention relates to a double-core wrapped composite yarn with a tight slub-like texture and its spinning process, belonging to the field of textile technology. Background Technology

[0002] Core-spun yarn, slub yarn, compact spun yarn, and wrapped yarn are all mature technologies developed in the textile industry to improve yarn performance or achieve special appearance styles. Traditional core-spun yarn typically uses a filament as the core, wrapped with short fibers to achieve strength, smoothness, or elasticity; slub yarn achieves a unique rugged style by forming a segmented structure of varying thickness on the yarn; compact spun technology can effectively reduce yarn hairiness and improve yarn strength and smoothness; wrapped yarn typically uses a filament spirally wrapped around a short fiber yarn or another filament to provide additional properties or luster. However, existing technologies usually only achieve a simple combination of one or two of the above effects. For example, while conventional core-spun slub yarn can combine elasticity and style, its outer structure is relatively simple, with more hairiness, and it lacks an outermost functional wrapping protection. To obtain a composite yarn that combines high strength, high elasticity, low fuzz, special luster, and regular slub style, and has a multi-layered protective structure, it usually requires multiple processes (such as first spinning core-spun yarn, and then twisting, wrapping, or generating slubs through post-processing). This process is lengthy, involves large equipment investment, high energy consumption, and low production efficiency. Furthermore, it is difficult to precisely control the uniformity and stability of the bonding between the various layers.

[0003] Therefore, the market urgently needs a method for continuously and stably integrating the spinning of yarns with more complex structures and highly composite functions on a single device, as well as an efficient preparation method for such yarns. Summary of the Invention

[0004] This invention provides the following technical solution: A double-core wrapped composite yarn with a tight slub-like texture, comprising a three-layer composite structure from the inside out, namely: The inner core layer is a double-core structure composed of a first filament and an elastic filament arranged in parallel. The intermediate outer sheath is a sheath formed by short fibers being aggregated and wrapped around the inner core layer through a compact spinning technique. The outer wrapping layer is formed by a second filament wrapped around the outside of the middle outer wrapping layer in a spiral Phil winding manner; The composite yarn has a regularly distributed slub structure, wherein the diameter of the yarn in the slub section is larger than that in the plain yarn section, and the outer wrapping layer is outside the slub yarn.

[0005] Preferably, the first filament is a high-strength multifilament selected from polyester filament and nylon filament; the elastic filament is a polyurethane or polyolefin elastic fiber.

[0006] Preferably, the short fibers in the intermediate outer layer are selected from at least one of cotton, linen, wool, regenerated cellulose fibers and their blends.

[0007] Preferably, the second filament is a functional or differentiated filament, selected from one of bright filament, colored filament, elastic filament or non-elastic filament.

[0008] A spinning process for a double-core wrapped composite yarn with a tight slub-like texture is completed continuously in one step on a spinning machine that integrates a tight spinning device, a double-core yarn feeding device, a slub yarn generating device, and an outer wrapping device. The process includes the following steps: S1: Feeding and drafting: The first filament and the elastic filament are fed in parallel after tension control; at the same time, the short fiber roving is fed into the drafting mechanism of the spinning machine for drafting. S2: Dual-core formation and preliminary composite: The parallel first filament and elastic filament are combined at the end of the stretching zone or the convergence point to form the dual-core structure; at the same time, the stretched short fiber slivers are brought closer to the dual-core structure and begin to wrap around it under the negative pressure of the compact spinning device. S3: Formation of the outer sheath of compact spinning: Under the aggregation effect of the compact spinning device, the short fibers are completely covered on the outside of the double core structure, and the basic double core is initially formed by twisting. S4: Slub formation and outer wrapping are carried out simultaneously: the middle and rear rollers are controlled by the slub yarn forming device to form slubs on the base core-spun yarn; at the same time, the outer wrapping device operates synchronously according to the slub formation signal, introduces the second filament, and wraps it synchronously in the slub formation period, so that the second filament forms a spiral wrapping with different density or structure on the slub yarn. S5: Final twisting and winding: The yarn strips processed in step S4 are finally twisted into yarn by the twisting mechanism and wound into shape.

[0009] Preferably, the slub yarn generating device is a servo motor driven mid- and rear roller speed change system.

[0010] Preferably, in step S4, the outer wrapping device operates synchronously according to the bamboo joint generation signal, which means that the device or guide device synchronously controls the tension of the second filament by using the speed change signals of the rear and middle rollers through the electronic control system.

[0011] Preferably, in step S4, adjusting the feeding parameters includes adjusting one or more of the tension of the second filament, the feeding speed, or the movement trajectory of the guide wire.

[0012] This invention features a uniform and stable yarn structure with a unique and controllable style. The fabric possesses the skeletal function of polyester filaments and a tightly spun structure, preventing overall fabric sagging and deformation. It perfectly embodies the concept of "both stylish and comfortable"; the tightly spun process results in extreme smoothness and delicacy, eliminating the roughness and fuzz of traditional cotton fabrics. The fluffiness of the slub sections provides a slight, elastic tactile feedback, like touching a cloud—soft yet supportive; the fabric has a warm touch, without the coldness or static electricity of synthetic fibers. It combines the natural moisture absorption of cotton with the dryness of synthetic fibers, delivering a breathable comfort experience. The fabric offers richer three-dimensionality, layering, and a linen-like effect; the core-spun and wrapped structure provides elasticity and fluffiness; short fibers offer softness and breathability, resulting in a more diverse fabric style.

[0013] The beneficial effects of this invention are: 1. Product structure innovation: It creatively integrates a four-fold structure of "dual core (functional core + elastic core)," "compact spinning outer wrapping," "regular slub," and "stylized outer wrapping." The resulting yarn simultaneously possesses high strength, high elasticity, low fuzz, unique luster, and a regular three-dimensional slub appearance, making it a high-value-added yarn with a high degree of performance and style integration.

[0014] 2. Process Integration and Innovation: Achieved one-time feeding and one-step yarn formation on a single spinning machine. Through precise linkage control of various devices (dual-core feeding, compact spinning, slub generation, and winding), key technical challenges such as tension matching of multi-layer materials and synchronization of slub and winding actions were solved, resulting in an extremely simplified process flow.

[0015] 3. Production efficiency and cost advantages: Compared with the traditional multi-process step-by-step production method, the present invention significantly shortens the production process, reduces equipment occupation, energy consumption and labor, significantly improves production efficiency and reduces overall costs.

[0016] 4. Superior product performance: Compact spinning technology ensures the basic quality of the yarn; the double-core structure provides core strength and elasticity; the outer wrapping layer not only enhances the slub style, but also provides additional protection or functions (such as brightening and elasticity enhancement). Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the radial cross-section of the composite yarn of the present invention. Figure 2 This is a schematic diagram illustrating the process principle of the integrated spinning machine involved in this invention. Figure 3 This is a schematic diagram of the yarn axial shape in the embodiment. In the diagram: 1. Inner core layer; 2. Middle outer sheath layer; 3. Outer wrapping layer; 4. Filament bobbin; 5. Elastic yarn bobbin; 6. First tensioner; 7. Second tensioner; 8. Cotton roving; 9. Back roller; 10. Middle roller; 11. Front roller; 12. Negative pressure gathering groove; 13. Filament bobbin; 14. Guide yarn; 15. Fine yarn tassel; 16. Slub device; A. Polyester filament; B. Elastic yarn; C. Cotton fiber; D. Polyester filament; E. Slub; F. Base yarn. Detailed Implementation

[0018] Example 1: This example provides a double-core wrapped composite yarn with a tight slub style and its spinning method.

[0019] Yarn structure: such as Figure 1 As shown, from the inside out are: The inner core layer 1 is composed of parallel merging of 20D / 36F polyester filament (first filament) and 30D spandex filament (elastic filament); The middle outer layer 2 is formed by tightly spinning 30-count pure cotton combed roving and then covering it; The outer wrapping layer 3 is made of 20D bright nylon filament (second filament) spirally wrapped around the outer layer.

[0020] Spinning process: such as Figure 2 As shown, this was carried out on a modified spinning machine.

[0021] Raw material feeding: Polyester filament bobbins 4 and spandex filament bobbins 5 are fed in parallel via the first tensioner 6 and the second tensioner 7, respectively; pure cotton roving 8 is fed into the rear roller 9.

[0022] Drafting and gathering: The cotton roving is drafted into fiber slivers in the drafting zone consisting of the back roller 9, middle roller 10, and front roller 11. The fiber slivers are gathered at the compact spinning negative pressure gathering groove 12 before the exit of the front roller 11.

[0023] Dual-core composite: Parallel polyester and spandex filaments meet with the gathered cotton fiber slivers at the inlet of the gathering tank 12 and enter the gathering tank 12 together, where the cotton fibers begin to wrap the dual core.

[0024] Slub Formation and Outer Wrapping: The servo motor-driven back and middle rollers 9 and 10 increase speed instantaneously according to a preset program, forming slubs. The bright nylon yarn unwound from bobbin 13 is introduced into position 12 through yarn guide 14. At a certain distance from the base yarn (adjusted according to different styles), the bright yarn forms a relatively loose spiral wrapping on the slub yarn.

[0025] Twisting and winding: After the composite yarn is twisted by the guide hook and the wire loop, it is wound onto the yarn bobbin to obtain the finished yarn 15. The yarn appearance is as follows. Figure 3 As shown, it exhibits a regular pattern of alternating bamboo joints E and base yarn F.

[0026] By adjusting the servo motor program of the bamboo joint device (such as speed increase, duration, and interval), the thickness, length, and pitch of the bamboo joint can be changed; by adjusting the linkage parameters of the outer wrapping device (such as tension and guide yarn movement mode), the contrast effect of the wrapped yarn at the bamboo joint and the flat yarn can be changed, thereby obtaining a series of products with different styles.

[0027] Quality Indicators:

Claims

1. A double-core wrapped composite yarn with a tightly packed slub-like texture, characterized in that, It consists of a three-layer composite structure from the inside out: The inner core layer is a double-core structure composed of a first filament and an elastic filament arranged in parallel. The intermediate outer sheath is a sheath formed by short fibers being aggregated and wrapped around the inner core layer through a compact spinning technique. The outer wrapping layer is formed by a second filament wrapped around the outside of the middle outer wrapping layer in a spiral Phil winding manner; The composite yarn has a regularly distributed slub structure, wherein the diameter of the yarn in the slub section is larger than that in the plain yarn section, and the outer wrapping layer is outside the slub yarn.

2. The double-core wrapped composite yarn with a tight slub style according to claim 1, characterized in that, The first filament is a high-strength multifilament, selected from either polyester filament or nylon filament; the elastic filament is a polyurethane or polyolefin elastic fiber.

3. The double-core wrapped composite yarn with a tight slub style according to claim 1, characterized in that, The intermediate outer layer of short fibers is selected from at least one of cotton, linen, wool, regenerated cellulose fibers and their blends.

4. The double-core wrapped composite yarn with a tight slub style according to claim 1, characterized in that, The second filament is a functional or differentiated filament, selected from one of bright filament, colored filament, elastic filament or non-elastic filament.

5. The spinning process for a double-core wrapped composite yarn with a tight slub style according to any one of claims 1-4, characterized in that, On a spinning frame that integrates a compact spinning device, a double-core yarn feeding device, a slub yarn generating device, and an external wrapping device, the process is completed continuously in one step, including the following steps: S1: Feeding and drafting: The first filament and the elastic filament are fed in parallel after tension control; at the same time, the short fiber roving is fed into the drafting mechanism of the spinning machine for drafting. S2: Dual-core formation and preliminary composite: The parallel first filament and elastic filament are combined at the end of the stretching zone or the convergence point to form the dual-core structure; at the same time, the stretched short fiber slivers are brought closer to the dual-core structure and begin to wrap around it under the negative pressure of the compact spinning device. S3: Formation of the outer sheath of compact spinning: Under the aggregation effect of the compact spinning device, the short fibers are completely covered on the outside of the double core structure, and the basic double core is initially formed by twisting. S4: Slub formation and outer wrapping are carried out simultaneously: the middle and rear rollers are controlled by the slub yarn forming device to form slubs on the base core-spun yarn; at the same time, the outer wrapping device operates synchronously according to the slub formation signal, introduces the second filament, and wraps it synchronously in the slub formation period, so that the second filament forms a spiral wrapping with different density or structure on the slub yarn. S5: Final twisting and winding: The yarn strips processed in step S4 are finally twisted into yarn by the twisting mechanism and wound into shape.

6. The spinning process according to claim 5, characterized in that, The slub yarn generating device is a servo motor driven mid and rear roller speed change system.

7. The spinning process according to claim 5, characterized in that, In step S4, the outer wrapping device operates synchronously according to the bamboo joint generation signal. This refers to the device or guide device that synchronously controls the tension of the second filament by using the speed change signals of the rear and middle rollers through the electronic control system.

8. The spinning process according to claim 5, characterized in that, In step S4, adjusting the feeding parameters includes adjusting one or more of the following: the tension of the second filament, the feeding speed, or the movement trajectory of the guide wire.

Images