Method and device for double-open interwoven spinning of staple and filament yarns

Abstract

The present invention provides a method and device for double-open interwoven spinning of staple and filament yarns, comprising a feeding unit, an auxiliary core-wrapping unit, and a winding unit. The method comprises arranging an electrostatic opening assembly in the filament feeding mechanism to open the multifilament yarn, and utilizing the auxiliary core-wrapping unit to open the staple slivers and further expand the filament sheets after opening, so that the staple slivers and the filament sheets are partially or completely repeatedly interwoven in the auxiliary core-wrapping unit. The filaments are wrapped by the rotation of the staple slivers and the force between the staple slivers, thereby forming a core-spun yarn with a sandwich structure. The method improves the filament ratio and mechanical properties of the core-spun yarn and reduces its hairiness index. The method adjusts the distance between the axis of the staple sliver and the axis of the sheet at the jaws of the front roller and coordinates this with the position of the yarn guide rod to achieve partial or complete repeated interwoven and automatic wrapping of the filaments and staple slivers, thereby achieving the preparation of core-spun yarns with different structures and meeting the application requirements of core-spun yarns.

Description

Technical Field

[0001] The present invention relates to the technical field of core-spun yarn, and in particular to a method and device for double-open interwoven spinning of staple fibers and filaments. Background Art

[0002] Core-spun yarn is a type of yarn composed of two or more fibers. Staple-fiber core-spun yarn is popular because it combines the advantages of the outer staple fibers with the core yarn, optimizing the structure and properties of the resulting yarn by leveraging their respective strengths. Currently, ring spinning is the mainstream method for producing core-spun yarn in my country's cotton spinning industry. Conventional ring spinning, due to the presence of a twisting triangle, can easily produce hairiness on the surface of the core-spun yarn and cause it to be exposed. To eliminate hairiness, compact spinning technology is used to gather staple fiber slivers before twisting them with the core yarn to form yarn. The key to this is the addition of a gathering device ahead of the front roller jaws, which gathers the staple fiber slivers before twisting them. This increases the adhesion and cohesion between the edge fibers and the main body of the twisted sliver, thereby reducing yarn hairiness. However, the current ring-spun core-spun yarn using concentrated spinning technology is still very prone to the phenomenon of exposed fibers. In order to ensure the covering effect and yarn quality of the core-spun yarn, factories usually increase the proportion of short fibers in the outer layer of covering, resulting in the core yarn proportion being generally below 15%. The core-spun yarn with a lower core yarn proportion affects the improvement of the comprehensive performance of the core-spun yarn.

[0003] The invention patent (application number CN202111337262.3) discloses a core-spun spinning device and a new structure core-spun spinning method with full coverage of a macro core. An auxiliary core-spun device is added between the front roller jaws and the yarn guide hook of an ordinary ring spinning frame. The auxiliary core-spun device includes a first yarn path for transmitting the outer material, a second yarn path for transmitting the core layer material, and a wrapping point for wrapping and merging; during the spinning process, the staple fiber strands and the filaments form a "y"-shaped twisting structure with the filaments in a straight state, and the filaments remain straight at the wrapping point. The staple fiber strands rely on the twist rotation of the filaments and part of their own twist to wrap around the outer layer of the filaments at the wrapping point, thereby forming a core-spun yarn with good wrapping effect, which solves the core exposure problem of ring-spun core-spun yarn. However, the above-mentioned core-spun spinning device is difficult to be applied to the high-speed spinning of ring spinning in actual factories. During the high-speed spinning process, the staple fiber whiskers are often gathered and contracted in the constraint channel due to the pulling effect of the spinning tension and the squeezing effect of the side walls of the constraint channel, resulting in a reduction in the wrapping area of ​​the whiskers on the core wire, thereby limiting the proportion of the core wire and reducing the wrapping tightness and coverage rate; in addition, the preparation of the core-spun yarn is essentially a method of wrapping the staple fiber whiskers by self-rotation of the core wire. The yarn is a straight core wire as the core and a spirally wrapped staple fiber whiskers as the sheath, which makes it easy for the core wire and the outer covering fiber to slide and fall apart, and the interface bonding force between the covering layer and the core wire is weak and the fastness is poor, which reduces the mechanical properties of the core-spun yarn.

[0004] In view of this, it is necessary to design an improved short fiber and filament double-open interwoven spinning method and device to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and device for double-open inter-embedded spinning of staple fibers and filaments. An electrostatic opening assembly is set in the filament feeding mechanism to open the multifilament yarn, and an auxiliary core-spun unit is used to open the staple fiber slivers and further expand the filaments after opening, so that the staple fiber slivers and the filaments are partially or completely repeatedly inter-embedded. After being wrapped by the rotation of the filaments and the force between the staple fiber slivers, a core-spun yarn with a sandwich structure is formed, so as to increase the filament ratio and mechanical properties of the core-spun yarn and reduce its hairiness index.

[0006] To achieve the above-mentioned purpose, the present invention provides a short fiber and filament double-open interwoven spinning device, comprising a feeding unit, an auxiliary core-wrapping unit and a winding unit;

[0007] The feeding unit includes a filament feeding mechanism and a staple drafting feeding mechanism. The filament feeding mechanism is provided with an electrostatic opening assembly and a threaded wire guide. The electrostatic opening assembly electrostatically opens the multifilament to form an unfolded sheet of yarn, which is fed into the auxiliary core-wrapping unit via the threaded wire guide. The staple drafting feeding mechanism drafts the roving into staple strands and feeds the staple strands into the auxiliary core-wrapping unit. The sheet of yarn formed by the electrostatic opening partially or completely overlaps with the staple strands in the auxiliary core-wrapping unit.

[0008] The auxiliary core-wrapping unit includes a negative pressure suction component, a transmission gear that provides power for the negative pressure suction component, and a yarn guide rod; the negative pressure suction component will open the staple fiber strips fed into the auxiliary core-wrapping unit, further expand the filaments, and make the staple fiber strips and the filaments interlock or partially interlock and then cover to form core-wrapped yarn; the core-wrapped yarn is collected and wound by the winding unit.

[0009] As a further improvement of the present invention, the negative pressure suction component includes a special-shaped plate, a tight roller, a grid ring sleeved on the outer surface of the special-shaped plate and the tight roller, an auxiliary conveying component arranged opposite to the grid ring, and a suction assembly arranged inside the special-shaped plate; the suction assembly negatively pressure-adsorbs the staple fiber strands and filaments on the surface of the grid ring; the grid ring is powered by the transmission gear and the auxiliary conveying component, rotates and transports forward along the special-shaped plate, and drives the staple fiber strands and filaments attached to the grid ring to be conveyed forward.

[0010] As a further improvement of the present invention, the negative pressure suction component also includes a suction port provided on the surface of the special-shaped plate, the suction port is covered by the grid ring, and the narrowest width of the suction port is not less than the width of the short fiber strands and the filaments; the suction component absorbs the short fiber strands and the filaments to the surface of the grid ring through the suction port, so that the short fiber strands are opened and the filaments are further expanded.

[0011] As a further improvement of the present invention, the suction port is of equal width, or is in a shape that gradually widens from narrow to wide along the conveying direction of the staple fiber strands and the filaments, so as to achieve the opening of the staple fiber strands and the expansion of the filaments; the narrowest width of the negative pressure suction port is 5 to 10 mm.

[0012] As a further improvement of the present invention, the filament feeding unit also includes a guide wheel for changing the angle of the multifilament; after the multifilament is guided by the guide wheel, it is input into the electrostatic wire opening component, which electrostatically opens the multifilament to form the sheet yarn; the sheet yarn is eliminated from excess static electricity by the threaded guide rod and enters the auxiliary core-spun unit, partially or completely overlapping and interlocking with the staple strands fed through the staple drafting feeding mechanism, and the self-rotation of the sheet yarn drives the staple strands to be wrapped to form core-spun yarn.

[0013] As a further improvement of the present invention, the staple fiber drafting feeding mechanism includes a bell mouth, a rear roller, a rear leather roller, a middle roller, a middle leather roller, a front roller, and a front leather roller in sequence along the feeding direction of the coarse yarn; the front roller and the front leather roller form a front roller jaw, and the staple fiber strips and filaments are input into the auxiliary core wrapping unit through the front roller jaw formed by the engagement of the front roller and the front leather roller.

[0014] As a further improvement of the present invention, the auxiliary conveying component includes a transmission roller and a bridge component connecting the front roller and the transmission roller. The front roller drives the bridge component to make the transmission roller rotate synchronously; the transmission roller contacts the grid ring and can assist in driving the grid ring to rotate forward stably for transportation.

[0015] The present invention also provides a short fiber and filament double-open interwoven spinning method, which uses any one of the short fiber and filament double-open interwoven spinning devices described above to prepare core-spun yarn; the specific spinning method is:

[0016] S1: The staple drafting and feeding mechanism drafts the roving into staple strands, and feeds the staple strands into the auxiliary core-spun unit through the front roller jaws formed by the meshing of the front roller and the front top roller; after the multifilaments are guided by the godet, the electrostatic opening assembly electrostatically opens the multifilaments into sheet yarns, which are fed into the front roller jaws through the threaded guide rods and output from the front roller jaws into the auxiliary core-spun unit;

[0017] S2, the suction assembly in the auxiliary core-wrapping unit negatively absorbs the staple fiber strands and the filaments on the surface of the mesh ring, so that the staple fiber strands are opened and the filaments are further expanded; the staple fiber strands and the filaments are partially or completely overlapped and embedded in each other;

[0018] S3, the mesh ring is powered by a transmission gear and an auxiliary conveying component, and is rotated and transported forward along the profiled plate and the compacting roller, thereby driving the staple fiber strands and the filament sheet attached to the mesh ring to be conveyed forward; during the conveying process, the filaments in the filament sheet rotate and drive the staple fiber strands embedded therewith to wrap around the outer layer of the filaments, and the interaction force between the staple fiber strands is used to further wrap around them to form a core-spun yarn;

[0019] S4. The core-spun yarn is passed through the yarn guide rod to make the core twisting structure more stable, and the core-spun yarn is wound around the yarn guide hook, steel collar and wire ring of the winding unit in sequence, and finally wound on the yarn tube of the winding unit to complete the short fiber and filament double-open interwoven spinning process.

[0020] As a further improvement of the present invention, the distance between the axis of the staple fiber strip along the length direction and the axis of the sheet wire along the length direction at the jaws of the front roller is 0 to 5 mm, so as to achieve partial or complete overlap and interlocking of the staple fiber strip and the sheet wire in the auxiliary core wrapping unit.

[0021] As a further improvement of the present invention, when the axis line of the staple fiber strip coincides with the axis line of the sheet yarn at the jaws of the front roller, the yarn guide rod and the axis line are arranged on the same straight line; when the distance between the axis line of the staple fiber strip and the axis line of the sheet yarn at the jaws of the front roller is not zero, the yarn guide rod is arranged at a position so that the core-spun yarn is output from the auxiliary core-spun unit at an angle of 5° to 30°.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention provides a method and device for double-open interwoven spinning of staple fibers and filaments. The spinning device opens the multifilament yarn by arranging an electrostatic opening assembly in the filament feeding mechanism, and uses an auxiliary core-wrapping unit to open the staple fiber strands and further expand the filaments after opening, so that the staple fiber strands and the filaments are partially or completely repeatedly interwoven. After wrapping by the rotation of the filaments and the force between the staple fiber strands, a core-spun yarn with a sandwich structure is formed, which greatly improves the filament ratio and mechanical properties of the core-spun yarn and reduces the hairiness index. The spinning method and device of the present invention overcome the technical difficulties of traditional ring-spun core-spun yarns, such as the inability to spread and hold the staple fiber strands and filaments, resulting in poor wrapping effect and high hairiness index.

[0024] 2. The present invention first uses an electrostatic opening assembly to open the multifilament yarn to form a sheet yarn of a certain width. The sheet yarn and the staple fiber whiskers are then controlled to pass through the gap between the front roller and the front roller to enter the auxiliary core-spun unit. The auxiliary core-spun unit uses a negative pressure suction component and defines the shape and size of the suction port to open the staple fiber whiskers without generating agglomeration force. At the same time, the sheet yarn is further expanded, so that the staple fiber whiskers and the sheet yarn are partially or completely repeatedly embedded on the surface of the mesh ring. The rotation of the filament drives the embedded staple fiber whiskers to wrap around the surface of the filament, and the interaction between the staple fiber whiskers is used to further wrap around the filament, forming a core-spun yarn with a sandwich structure. This core-spun yarn utilizes the twisting between multiple filaments and the staple fiber whiskers to effectively enhance the clamping and cohesive force between the filaments and the staple fiber whiskers. The resulting core-spun yarn is stable, wear-resistant, and has low hairiness. It has application value in high-end sewing, textile clothing, military uniforms, protective clothing and other fields.

[0025] 3. The present invention adjusts the distance between the axis of the staple fiber strands and the axis of the sheet yarn between the front roller and the front roller, that is, adjusts the position of the two entering the front roller jaws, thereby achieving partial or complete overlap and interlocking of the staple fiber strands and the sheet yarn in the auxiliary core-wrapping unit; and cooperates with the position of the yarn guide rod to achieve automatic wrapping of the filament and the staple fiber strands, thereby realizing the preparation of core-wrapped yarns with different structures and meeting the application of core-wrapped yarns with different needs.

[0026] 4. The present invention arranges an auxiliary conveying component above the negative pressure suction component to make the transmission roller contact with the grid ring. With the help of the joint action of the transmission roller and the transmission gear, the grid ring is driven to rotate, making the transmission of the grid ring more stable, providing stable conditions for the wrapping process of the filament and the staple fiber strips, and is conducive to the successful preparation of industrial core-spun yarn. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a simplified diagram of the spinning process of the short fiber and filament double-open interlocking spinning device of the present invention.

[0028] Figure 2 for Figure 1 Schematic diagram of the partial structure of the auxiliary core-spun unit in the spinning device.

[0029] Figure 3 The diagram shows the preparation process and structure of the core-spun yarn when the axis lines of the staple fiber strands and the axis lines of the sheet yarn coincide with each other and are input into the front roller jaws.

[0030] Figure 4 The diagram shows the preparation process and structure of the core-spun yarn when the axis line of the staple fiber strand and the axis line of the sheet yarn are input into the front roller jaws at a certain distance.

[0031] Reference numerals

[0032] S1-Roving; S11-Staple Fiber; F1-Multifilament; F11-Filament; 110-Filament Feeding Mechanism; 111-Electrostatic Splitting Assembly; 112-Goat Wheel; 120-Staple Fiber Drafting and Feeding Mechanism; 121-Bell Mouth; 122-Back Roller; 123-Back Top Roller; 124-Middle Roller; 125-Middle Top Roller; 126-Front Roller; 127-Front Top Roller; 200-Auxiliary Core Spun Single Element; 210-negative pressure suction component; 211-special-shaped plate; 212-compact roller; 213-grid ring; 214-auxiliary conveying component; 214-1-transmission roller; 214-2-bridge component; 215-suction port; 220-transmission gear; 230-yarn guide rod; 300-winding unit; 310-yarn guide hook; 320-wire ring; 330-program plate; 340-yarn tube. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0035] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0036] See also Figure 1As shown, a short fiber and filament double-open interwoven spinning device includes a feeding unit, an auxiliary core-wrapping unit 200 and a winding unit 300; the feeding unit includes a filament feeding mechanism 110 and a short fiber drafting feeding mechanism 120, the filament feeding mechanism 110 is provided with an electrostatic opening component 111 and a threaded wire guide rod, the electrostatic opening component 111 electrostatically opens the multifilament F1 to form an unfolded sheet F11, and the sheet F11 is input into the auxiliary core-wrapping unit 200 through the threaded wire guide rod; the short fiber drafting feeding mechanism 120 drafts the coarse yarn S1 into a short fiber sliver S11 and feeds it to the auxiliary core-wrapping unit 200; Core unit 200; the filament F11 formed after electrostatic opening partially or completely overlaps with the staple fiber sliver S11 in the auxiliary core-wrapping unit 200; the auxiliary core-wrapping unit 200 includes a negative pressure suction component 210, a transmission gear 220 that provides power to the negative pressure suction component 210, and a yarn guide rod 230; the negative pressure suction component 210 opens the staple fiber sliver S11 fed into the auxiliary core-wrapping unit 200, further expands the filament F11, and makes the staple fiber sliver S11 and the filament F11 interlock or partially interlock and then cover to form a core-wrapped yarn; the core-wrapped yarn is collected and wound by the winding unit 300.

[0037] In particular, the spinning device opens the multifilament F1 by arranging an electrostatic opening assembly 111 in the filament feeding mechanism 110, and uses the auxiliary core-spun unit 200 to open the staple sliver S11 and further expand the sheet filament F11 after opening, so that the staple sliver S11 and the sheet filament F11 are partially or completely repeatedly embedded in each other, and then automatically wrapped by the rotation of the filament and the force between the staple slivers S11 to form a core-spun yarn with a sandwich structure, which greatly improves the filament ratio and mechanical properties of the core-spun yarn and reduces the hairiness index. The spinning method and device of the present invention overcome the technical difficulties of the traditional ring-spun core-spun yarn, such as the inability to spread and hold the staple slivers S11 and filaments, resulting in poor wrapping effect and high hairiness index, and are of great significance to improving the comprehensive performance of the core-spun yarn.

[0038] See also Figure 2As shown, the negative pressure suction component 210 includes a special-shaped plate 211, a compact roller 212, a grid ring 213 mounted on the outer surface of the special-shaped plate 211 and the compact roller 212, an auxiliary conveying component 214 arranged opposite to the grid ring 213, and a suction assembly arranged inside the special-shaped plate 211; the suction assembly negatively pressure-adsorbs the staple fiber strands S11 and the filaments F11 on the surface of the grid ring 213; the grid ring 213 is powered by the transmission gear 220 and the auxiliary conveying component 214, rotates and transports forward along the special-shaped plate 211, and drives the staple fiber strands S11 and the filaments F11 attached to the grid ring 213 to be conveyed forward. With such an arrangement, the negative pressure suction component 210 of the auxiliary core-spun unit 200 is utilized to open the staple fiber sliver S11 without generating a gathering force, and at the same time, the sheet filament F11 is further expanded, so that the staple fiber sliver S11 and the sheet filament F11 are partially or completely overlapped and embedded in each other on the surface of the grid ring 213; the rotation of the filament drives the staple fiber sliver S11 embedded therewith to be wrapped around the surface of the filament, and the action force between the staple fiber slivers S11 is utilized to further wrap around it, forming a core-spun yarn with a sandwich structure.

[0039] Specifically, the negative pressure suction component 210 also includes a suction port 215 provided on the surface of the special-shaped plate 211. The suction port 215 is covered by the mesh ring 213. The narrowest width of the suction port 215 is not less than the width of the staple fiber sliver S11 and the filament F11. The suction component absorbs the staple fiber sliver S11 and the filament F11 to the surface of the mesh ring 213 through the suction port 215, so that the staple fiber sliver S11 is opened and the filament is further expanded. With such arrangement, by limiting the shape and size of the air suction port 213, no twist is applied to the staple fiber slivers S11 and the filaments F11 when they pass through the grid ring 213, and no aggregation occurs. The staple fiber slivers S11 and the filaments F11 are only supported and transported. At the same time, the staple fiber slivers S11 are opened under the guided spreading action of the negative pressure airflow, and a staple fiber belt with a certain width, uniform fiber distribution and a certain interaction force is provided. The staple fiber belt completely or partially overlaps and embeds with the filaments F11, and relies on the rotation of each filament to realize the wrapping of the filaments by the surrounding staple fibers, and at the same time utilizes the force between the staple fibers to further twist and wrap, and finally forms a layered core-spun yarn in which the filaments and the staple fiber slivers S11 are interlocked and tightly clamped, thereby improving the mechanical properties of the core-spun yarn, and having application value in high-end sewing, textile clothing, military uniforms, protective clothing and other fields.

[0040] Preferably, the suction port 215 is of equal width, or is in a shape that gradually widens along the conveying direction of the staple fiber strands S11 and the filaments F11, so as to achieve the opening of the staple fiber strands S11 and the expansion of the filaments F11; the narrowest width of the negative pressure suction port is 5 to 10 mm.

[0041] The filament feeding unit 110 also includes a guide wheel 112 for changing the angle of the multifilament F1; after the multifilament F1 is guided by the guide wheel 112, it is input into the electrostatic opening component 111 at a certain angle, which electrostatically opens the multifilament F11 to form a sheet yarn F11; the sheet yarn F11 is eliminated of excess static electricity by the threaded guide rod, and the sheet yarn F11 enters the auxiliary core-spun yarn unit 200, partially or completely overlapping and interlocking with the staple fiber sliver S11 fed through the staple fiber drafting feeding mechanism 120, and the sheet yarn F11 rotates to drive the staple fiber sliver S11 to be wrapped to form a core-spun yarn.

[0042] In some specific embodiments, the threaded wire guide rod is arranged at the outlet of the electrostatic wire opening component 111. The threaded wire F11 after opening passes through the threaded wire guide rod, which can eliminate the static electricity it carries, thereby avoiding the adverse effects of static electricity on the further expansion of the wire F11, and at the same time ensuring the safety of the subsequent spinning process.

[0043] Specifically, the staple fiber drafting feeding mechanism 120 includes a bell mouth 121, a rear roller 122, a rear leather roller 123, a middle roller 124, a middle leather roller 125, a front roller 126, and a front leather roller 217 along the feeding direction of the coarse yarn S1; the front roller 126 and the front leather roller 217 form a front roller jaws, and the staple fiber strip S11 and the filament F11 are both input into the auxiliary core wrapping unit 200 through the front roller jaws formed by the engagement of the front roller 216 and the front leather roller 217.

[0044] The auxiliary conveying component 214 includes a transmission roller 214-1 and a bridge component 214-2 connecting the front roller 217 and the transmission roller 214-1. The front roller 217 drives the bridge component 214-2, causing the transmission roller 214-1 to rotate synchronously. The transmission roller 214-1 contacts the mesh ring 213 and can assist in driving the mesh ring 213 to rotate forward stably. In this way, the auxiliary conveying component 214 is set above the negative pressure suction component 210, so that the transmission roller 214-1 contacts the mesh ring 213. With the combined action of the transmission roller 214-1 and the transmission gear 220, the mesh ring 213 is driven to rotate, making the transmission of the mesh ring 213 more stable, providing stable conditions for the wrapping process of the filament F11 and the staple fiber sliver S11, and facilitating the successful preparation of industrial core-spun yarn.

[0045] A short fiber and filament double-open interwoven spinning method, using a short fiber and filament double-open interwoven spinning device to prepare core-spun yarn; the specific spinning method is:

[0046] The S1 and staple fiber drafting and feeding mechanisms 120 draft the roving S1 into staple fiber strands S11, which are then fed into the auxiliary core-spinning unit 200 through the front roller jaws between the front roller 126 and the front top roller 217. The multifilament F1 is guided by the godet 112 and then electrostatically opened by the electrostatic opening assembly 111 to form a sheet F11. The sheet F11 is then fed into the front roller jaws via a threaded guide rod and fed into the auxiliary core-spinning unit 200 through the front roller jaws.

[0047] S2, the suction assembly in the auxiliary core-wrapping unit 200 negatively absorbs the staple fiber strands S11 and the filaments F11 on the surface of the mesh ring 213, so that the staple fiber strands S11 are opened and the filaments F11 are further expanded; the staple fiber strands S11 and the filaments F11 are partially or completely overlapped and embedded in each other;

[0048] The mesh ring S3 and mesh ring 213 are powered by the transmission gear 220 and the auxiliary conveying component 214, and are rotated and transported forward along the profiled plate 211 and the compacting roller 212, driving the staple fiber strands S11 and the filament sheet F11 attached to the mesh ring 213 to be conveyed forward. During the conveying process, the filaments in the filament sheet F11 rotate and drive the staple fiber strands S11 embedded therein to wrap around the outer layer of the filaments. The staple fiber strands S11 are further wrapped by the force between them to form a core-spun yarn.

[0049] S4. The core-spun yarn changes its transmission path through the yarn guide rod to make the structure of the core-spun twisting part more stable, and the core-spun yarn is sequentially wound around the yarn guide hook 310 of the winding unit 300, the steel ring on the steel ring plate 330 and the wire ring 320, and finally wound on the yarn tube 340 of the winding unit, completing the short fiber and filament double-open interwoven spinning process.

[0050] Specifically, the distance between the axis of the staple fiber sliver S11 along the length direction and the axis of the sheet yarn F11 along the length direction at the jaws of the front roller is 0 to 5 mm, so as to achieve partial or complete overlap and interlocking of the staple fiber sliver S11 and the sheet yarn F11 in the auxiliary core wrapping unit 200. The present invention first uses the electrostatic wire-opening component 111 to open the multifilament F1 to form a sheet yarn F11 with a certain width, and then controls the sheet yarn F11 and the stretched staple fiber sliver S11 to pass through the distance between the front roller jaws 126 and the front roller 217 to enter the auxiliary core-spun unit 200; when the axis line of the staple fiber sliver S11 coincides with the axis line of the sheet yarn F11 at the front roller jaws, the yarn guide rod 230 and the axis line are arranged on the same straight line; when the distance between the axis line of the staple fiber sliver S11 and the axis line of the sheet yarn F11 at the front roller jaws is not zero, the yarn guide rod 230 is arranged at a position so that the core-spun yarn is output from the auxiliary core-spun unit 200 at an angle of 5° to 30°.

[0051] With such a setting, by adjusting the distance between the axis center line of the staple fiber sliver S11 and the axis center line of the sheet yarn F11 in the front roller jaws between the front roller 126 and the front leather roller 217, that is, adjusting the position of the two entering the front roller jaws, the staple fiber sliver S11 and the sheet yarn F11 are partially or completely overlapped and embedded in the auxiliary core-wrapping unit 200; and cooperating with the position of the yarn guide rod 230, the automatic wrapping of the filament and the staple fiber sliver S11 is realized, thereby realizing the preparation of core-wrapped yarns with different structures, and specifically meeting the application of core-wrapped yarns with different needs.

[0052] See also Figure 3 The figure shows the process and structure of preparing the core-spun yarn when the axis of the staple fiber strand S11 and the axis of the filament F11 coincide with each other at the front roller jaws; wherein, Figure 3 After the fibers are opened and expanded by the suction port 215 in (a), the width of the filament F11 is greater than the width of the staple fiber strip S11, forming a core-spun yarn structure with staple fibers and filaments embedded inside and filaments on the outside. The core-spun yarn exhibits the best wear resistance. Figure 3 (b) After the fibers are opened and expanded through the suction port 215, the width of the filament F11 is equal to the width of the staple fiber strip S11, forming a core-spun yarn structure in which the staple fibers and the filaments are completely interwoven. The core-spun yarn has good mechanical properties, little surface hairiness, and a strong interlocking and bonding force between the filaments and the staple fibers, resulting in a stable and durable yarn structure. Figure 3 In (c), after the fibers are opened and expanded through the suction port 215, the width of the filament F11 is smaller than the width of the staple fiber strip S11, forming a core-spun yarn structure with staple fibers and filaments embedded inside and staple fibers on the outside. The core-spun yarn has the appearance and feel of staple yarn, and the core layer has a stable structure with filaments clamping staple fibers.

[0053] See also Figure 4 As shown in FIG, it is a schematic diagram of the core-spun yarn preparation process and structure when the axis of the staple fiber strand S11 and the axis of the filament F11 are input into the front roller jaws at a certain distance. Figure 4 In (a), the distance between the axis of the staple fiber sliver S11 and the axis of the filament F11 at the jaws of the front roller is 1 to 5 mm, and the yarn guide rod 230 is arranged on the side close to the staple fiber sliver S11; after the fibers are opened and expanded by the suction port 215, a three-layer core-spun yarn is obtained, in which the yarn core layer is filaments, the yarn shell layer is filaments and staple fibers embedded in each other, and the yarn surface layer is staple fibers. Figure 4 In (b), the distance between the axis of the staple fiber strip S11 and the axis of the filament F11 at the jaws of the front roller is 1 to 5 mm, and the yarn guide rod 230 is arranged on the side close to the filament F11; after the fibers are opened and expanded by the suction port 215, a two-layer core-spun yarn is obtained, in which the core layer is a stable structure in which the filaments clamp the staple fibers, and the outermost layer is a filament-wrapped core yarn.

[0054] The core-spun yarn prepared by the short fiber and filament double-open interwoven spinning method and device of the present invention utilizes multifilament F1 to spread out to form a sheet filament F11 with multiple filaments, and the sheet filament F11 and the short fiber whisker S11 are torsionally cohesive, effectively improving the clamping and cohesive force between the filament and the short fiber whisker, and the formed core-spun yarn has a stable structure, good mechanical properties, and less hairiness. In actual application, the spinning device of the present invention only needs to adjust the input spacing of the axis center line of the short fiber whisker S11 and the axis center line of the sheet filament F11 between the front roller 126 and the front roller 217, and adjust the position of the yarn guide rod 230 accordingly, without changing the device itself, to obtain core-spun yarns of various structures, thereby realizing the diversified preparation of core-spun yarns with good comprehensive performance; it can also specifically prepare core-spun yarns with extremely outstanding performance in a certain aspect according to needs; the short fiber and filament double-open interwoven spinning device and process method have industrial application value.

[0055] Example 1

[0056] use Figure 3 (a) shows a method and apparatus for core-spun yarn of double-open interwoven yarn of pure cotton staple fiber and nylon filament. The axis line of the staple fiber sliver S11 and the axis line of the sheet yarn F11 are arranged to overlap and be input at the jaws of the front roller. The yarn surface is wrapped with nylon filament and the core layer is a smooth and wear-resistant yarn of interwoven twisted nylon yarn and cotton fiber.

[0057] On a conventional ring-spun compact core-spun yarn device, pure cotton staple fiber strands were completely overlapped and twisted with nylon filaments to produce a conventional compact core-spun yarn with a cotton fiber surface and a nylon filament core. The performance of this yarn was compared with the core-spun yarn prepared in Example 1. The test results showed that compared with the conventional compact core-spun yarn, the smooth, wear-resistant yarn obtained in Example 1 had a 92% improvement in hairiness and a 67% increase in wear resistance.

[0058] Example 2

[0059] use Figure 4 (a) shows a double-open interwoven spinning method and apparatus for pure cotton staple fibers and nylon filaments for core-spun yarn. The distance between the axis of the staple fiber sliver S11 and the axis of the sheet yarn F11 at the front roller jaws is set to 5 mm, forming a three-layer composite core-spun yarn that is high-strength, overall wear-resistant, and soft and comfortable. The yarn surface is covered with soft and comfortable cotton fibers, the yarn core is partially made of nylon filaments, and the yarn shell layer between the yarn surface and the yarn core is made of nylon yarns and cotton fibers interwoven and twisted.

[0060] On a conventional ring-spindle sirofil spinning apparatus, pure cotton staple fiber slivers and nylon yarns were twisted at a distance of 5 mm at the front roller nip. This resulted in a filament-wrapped yarn composed of intertwined cotton and nylon fibers. The resulting yarn was then compared to the core-spun yarn prepared in Example 2. The test results showed that the three-layer composite core-spun yarn obtained in Example 2 exhibited a 30% increase in strength and a 42% improvement in abrasion resistance compared to conventional filament-wrapped yarn.

[0061] In summary, the present invention provides a method and device for double-open inter-embedded spinning of staple and filament, comprising a feeding unit, an auxiliary core-spun unit and a winding unit; by arranging an electrostatic opening component in the filament feeding mechanism, the multifilament is opened, and the auxiliary core-spun unit is used to open the staple slivers and further expand the filaments after opening, so that the staple slivers and the filaments are partially or completely repeatedly inter-embedded, and after being wrapped by the self-rotation of the filaments and the force between the staple slivers, a core-spun yarn with a sandwich structure is formed, so as to increase the filament proportion and mechanical properties of the core-spun yarn and reduce its hairiness index. The present invention first uses an electrostatic opening assembly to open the multifilament yarn to form a sheet yarn with a certain width. The sheet yarn and the staple fiber whiskers are then controlled to pass through the gap between the front roller and the front roller and enter the auxiliary core-spun unit. The auxiliary core-spun unit uses a negative pressure suction component and defines the shape and size of the suction port to open the staple fiber whiskers without generating agglomeration force. At the same time, the sheet yarn is further expanded so that the staple fiber whiskers and the sheet yarn are partially or completely repeatedly embedded on the surface of the grid ring. The rotation of the filament drives the embedded staple fiber whiskers to wrap around the surface of the filament, and the interaction between the staple fiber whiskers is used to further wrap around the filament, forming a core-spun yarn with a sandwich structure. The core-spun yarn utilizes the twisting between multiple filaments and the staple fiber whiskers to effectively enhance the clamping and cohesive force between the filaments and the staple fiber whiskers. The resulting core-spun yarn is stable, wear-resistant, and has low hairiness. It has high application value in high-end sewing, textile clothing, military uniforms, protective clothing and other fields. The spinning method and device of the present invention overcome the technical difficulties of poor wrapping effect and high hairiness index caused by the inability to spread and hold the staple fibers and filaments of traditional ring-spun core-spun yarns.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A short fiber and filament double-open interwoven spinning device, characterized in that: It includes feeding unit, auxiliary core wrapping unit and winding unit; The feeding unit includes a filament feeding mechanism and a staple drafting feeding mechanism. The filament feeding mechanism is provided with an electrostatic opening assembly and a threaded wire guide. The electrostatic opening assembly electrostatically opens the multifilament to form an unfolded sheet of yarn, which is fed into the auxiliary core-wrapping unit via the threaded wire guide. The staple drafting feeding mechanism drafts the roving into staple strands and feeds the staple strands into the auxiliary core-wrapping unit. The sheet of yarn formed by the electrostatic opening partially or completely overlaps with the staple strands in the auxiliary core-wrapping unit. The auxiliary core-spun unit includes a negative pressure suction component, a transmission gear for providing power to the negative pressure suction component, and a yarn guide rod; the negative pressure suction component opens the staple fiber strands fed into the auxiliary core-spun unit, further expands the filaments, and causes the staple fiber strands and the filaments to interlock or partially interlock and then cover to form core-spun yarn; the core-spun yarn is collected and wound by the winding unit; The negative pressure suction component includes a special-shaped plate, a compact roller, a mesh ring sleeved on the outer surface of the special-shaped plate and the compact roller, an auxiliary conveying component arranged opposite to the mesh ring, and a suction assembly arranged inside the special-shaped plate; the suction assembly negatively absorbs the staple fiber strands and the filaments on the surface of the mesh ring; the mesh ring is powered by the transmission gear and the auxiliary conveying component, rotates and transports forward along the special-shaped plate, and drives the staple fiber strands and the filaments attached to the mesh ring to be conveyed forward; The negative pressure suction component further includes a suction port provided on the surface of the special-shaped plate, the suction port being covered by the mesh ring, and the narrowest width of the suction port being no less than the width of the staple fiber strands and the filaments; the suction assembly absorbs the staple fiber strands and the filaments onto the surface of the mesh ring through the suction port, thereby opening the staple fiber strands and further expanding the filaments; The suction port is of equal width, or is in a shape that gradually widens from narrow to wide along the conveying direction of the staple fiber strands and the filaments, so as to achieve the opening of the staple fiber strands and the expansion of the filaments; the narrowest width of the negative pressure suction port is 5~10mm.

2. The short fiber and filament double-open interwoven spinning device according to claim 1, characterized in that: The filament feeding unit further includes a godet for changing the angle of the multifilament; after being guided by the godet, the multifilament is fed into the electrostatic opening assembly, which electrostatically opens the multifilament to form the sheet yarn; The sheet yarn passes through the threaded wire guide to eliminate excess static electricity and enters the auxiliary core-spun unit, partially or completely overlapping and interlocking with the staple fiber strips fed through the staple fiber drafting and feeding mechanism. The sheet yarn rotates to drive the staple fiber strips to be wrapped to form core-spun yarn.

3. The short fiber and filament double-open interwoven spinning device according to claim 1, characterized in that: The staple fiber drafting feeding mechanism includes a bell mouth, a rear roller, a rear leather roller, a middle roller, a middle leather roller, a front roller, and a front leather roller in sequence along the feeding direction of the coarse yarn; the front roller and the front leather roller form a front roller jaw, and the staple fiber strands and filaments are input into the auxiliary core-wrapping unit through the front roller jaw formed by the engagement of the front roller and the front leather roller.

4. The short fiber and filament double-open interwoven spinning device according to claim 3, characterized in that: The auxiliary conveying component includes a transmission roller and a bridge component connecting the front roller and the transmission roller. The front roller drives the bridge component to make the transmission roller rotate synchronously; the transmission roller contacts the grid ring and can assist in driving the grid ring to rotate forward stably for transportation.

5. A method for spinning staple fibers and filaments in a double-open interlocking manner, characterized in that: The core-spun yarn is prepared by using the short fiber and filament double-open interwoven spinning device according to any one of claims 1 to 4; the specific spinning method is: S1: The staple drafting and feeding mechanism drafts the roving into staple strands, and feeds the staple strands into the auxiliary core-spun unit through the front roller jaws formed by the meshing of the front roller and the front top roller; after the multifilaments are guided by the godet, the electrostatic opening assembly electrostatically opens the multifilaments into sheet yarns, which are fed into the front roller jaws through the threaded guide rods and output from the front roller jaws into the auxiliary core-spun unit; S2, the suction assembly in the auxiliary core-wrapping unit negatively absorbs the staple fiber strands and the filaments on the surface of the mesh ring, so that the staple fiber strands are opened and the filaments are further expanded; the staple fiber strands and the filaments are partially or completely overlapped and embedded in each other; S3, the mesh ring is powered by a transmission gear and an auxiliary conveying component, and is rotated and transported forward along the profiled plate and the compacting roller, thereby driving the staple fiber strands and the filament sheet attached to the mesh ring to be conveyed forward; during the conveying process, the filaments in the filament sheet rotate and drive the staple fiber strands embedded therewith to wrap around the outer layer of the filaments, and the interaction force between the staple fiber strands is used to further wrap around them to form a core-spun yarn; S4. The core-spun yarn is passed through the yarn guide rod to make the core twisting structure more stable, and the core-spun yarn is wound around the yarn guide hook, steel collar and wire ring of the winding unit in sequence, and finally wound on the yarn tube of the winding unit to complete the short fiber and filament double-open interlocking core-spun spinning process.

6. The short fiber and filament double-open interwoven spinning method according to claim 5, characterized in that: The distance between the axis of the staple fiber strip along the length direction and the axis of the sheet wire along the length direction at the jaws of the front roller is 0-5 mm, so as to achieve partial or complete overlap and interlocking of the staple fiber strip and the sheet wire in the auxiliary core-wrapping unit.

7. The short fiber and filament double-open interwoven spinning method according to claim 6, characterized in that: When the axis line of the staple fiber strip coincides with the axis line of the sheet yarn at the jaws of the front roller, the yarn guide rod and the axis line are arranged on the same straight line; when the distance between the axis line of the staple fiber strip and the axis line of the sheet yarn at the jaws of the front roller is not zero, the yarn guide rod is arranged at a position so that the core-spun yarn is output from the auxiliary core-spun unit at an angle of 5°~30°.

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