CN113943990A - Core-spun spinning device and new-structure core-spun spinning method with completely wrapped macro cores - Google Patents
Core-spun spinning device and new-structure core-spun spinning method with completely wrapped macro cores Download PDFInfo
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- CN113943990A CN113943990A CN202111337262.3A CN202111337262A CN113943990A CN 113943990 A CN113943990 A CN 113943990A CN 202111337262 A CN202111337262 A CN 202111337262A CN 113943990 A CN113943990 A CN 113943990A
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/36—Cored or coated yarns or threads
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H11/00—Arrangements for confining or removing dust, fly or the like
Abstract
The invention provides a core-spun spinning device and a core-spun spinning method with a novel structure and a macro core fully wrapped. The core-spun spinning device is additionally provided with an auxiliary core-spun device between a front roller jaw and a yarn guide hook of a common ring spinning frame, wherein the auxiliary core-spun device comprises a first yarn channel for transmitting an outer-wrapping material, a second yarn channel for transmitting a core layer material and a wrapping point for wrapping and converging. In the spinning process, the short fiber strands and the filaments form a Y-shaped twisted structure taking the filaments as the straightened state, the filaments are kept in the straightened state at the wrapping point, and the short fiber strands are wrapped on the outer layer of the filaments at the wrapping point by means of the twist rotation of the filaments and the partial twist of the short fiber strands, so that the covering yarn with good covering effect is formed, and the core exposure problem of the ring spinning covering yarn is solved. The invention is coated by the nano fiber, thereby completely eliminating yarn hairiness and comprehensively improving yarn forming performance. The method is convenient and fast to operate, low in modification cost and obvious in performance improvement effect on the ring spun core-spun yarn.
Description
Technical Field
The invention relates to the field of textile processing technology, in particular to a core-spun spinning device and a new-structure core-spun spinning method with a macro core fully wrapped.
Background
The core-spun yarn is favored by people because of the specific core-sheath structure, and the spinning and research on the core-spun yarn have not been stopped. The core-spun yarn is a yarn spun by twisting a chemical fiber filament with good strength and elasticity as a core filament and a short fiber strand such as cotton, hemp, wool, viscose and the like coated outside. Most of the research on the core-spun yarn at the present stage is to research on materials for spinning the core-spun yarn to realize multifunctionality, and the research on methods for realizing core-spun is less. The existing technologies for spinning core-spun yarns have an inevitable problem: the core yarn can not be completely coated, and the core is not exposed.
The ring spinning in the market is the most mainstream spinning technology at present, and the ring spinning core-spun yarn is formed by adding a filament feeding device on a common ring spinning frame, feeding filaments from the middle of fiber strands, and wrapping the short fiber strands around the fiber strands through rotary twisting of an air ring. However, the ring spun core spun yarn is easy to have the phenomenon of 'filament emergence', and a measure of improving the fiber proportion of an outer layer is usually adopted by a factory to ensure the production efficiency and the quality of the yarn, and the volume proportion of the core yarn is generally below 15%.
The sirospun covering technique is that two drafted slivers are twisted together with core yarn at the twisting point after being primarily twisted, and because the two drafted slivers are symmetrically distributed by taking the core yarn as an axis, the two strands are spirally wound and wrapped by taking the core yarn as an axis to form the covering yarn. However, the sirospun core-spun technology requires two sets of roving for spinning, which results in high cost and certain difficulty in arranging the roving.
The friction spinning core-spun technology is a spinning technology for producing core-spun yarns in mainstream at present, and belongs to open-end spinning. The fiber is fed from the upper part of the dust cage after passing through the carding roller, is condensed and gathered at the wedge-shaped suction port between the two dust cages, and simultaneously the fiber strands are twisted by rubbing and twisting the fiber strands by means of friction and rotation of the dust cages to form yarns. The friction spinning covering yarn has good covering effect, but due to the characteristics of the friction spinning yarn, the effective length of the fiber in the yarn is lower, and the yarn strength is lower. Meanwhile, friction spinning is difficult when a fine yarn is to be spun.
The core-spun yarn produced by the rotor spinning core-spun technology has better yarn evenness, strength and hairiness than ring spinning core-spun yarn. However, the rotor core-spun yarn has the problems of uneven core-spun and core-leaking yarn.
In order to solve the core exposure problem of the existing core-spun yarn, a patent CN213266838U 'core yarn positioning device of a compact spinning frame core-spun yarn disclosed by the Chinese patent No. 2021, No. 5, No. 25' is additionally provided with a filament positioning device on the compact spinning frame, so that the filament is kept at the central position of a twisting triangular area when the core-spun yarn is spun, thereby improving the coating condition of the core-spun yarn, but the method only improves the phenomenon of filament deviation, and does not improve the core exposure problem that the core-spun yarn cannot be completely coated by the outer coating fiber of the ring spinning core-spun yarn.
The invention patent CN109518331A published in 3/26/2019 of Chinese patent application No. CN109518331A discloses a core-spun yarn production device and a production method thereof, which adopts a channel limiter to ensure that covered roving strands and filaments pass through a lead channel in the channel limiter to be stably fed into a nip of a front roller and keep the filaments in the middle of short fiber strands for twisting to form core-spun yarns.
Chinese patent No. 2004, 5, 12, discloses a covering device for sirofil spinning CN2615158Y, which uses an auxiliary spinning device to improve the covering yarn method of the spinning frame, uses a yarn guide to increase the tension of the sirofil filaments to keep the sirofil filaments in a straight state during twisting, the short fiber strips come out from the front roller nip and then join with the core yarn at the supporting column position, and the twisting is driven by the twist on the core yarn to form the covering yarn. The covering yarn formed by the method has good covering effect, improves the core exposing problem of filaments, but the structure is unstable, and the short fiber strand section is easy to be interfered by external factors to generate fluctuation so as to cause broken ends.
In view of the above, there is a need to design an improved core-spun yarn device and a new core-spun yarn method with a macro-core fully wrapped structure to solve the above problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a core-spun spinning device and a new-structure core-spun spinning method for full wrapping of a macro core. The twist and tension of the core layer filament and the outer covering fiber strip are regulated and controlled by offsetting the two crossed yarn channels, so that the tension of the filament section is far greater than that of the short fiber strip, and core deviation is prevented. During twisting and wrapping, the short fibers overcome the friction force and the smaller cohesive force among the fibers under the twisting action of the twist of the filaments, so that the short fibers are wrapped on the filaments to form the outer-layer wrapping fibers with good straightening degree. The invention also forms a multi-component and multi-layered structure by coating a layer of nano fiber on the outer layer of the core-spun yarn, thereby completely eliminating hairiness.
In order to achieve the purpose, the invention provides a core-spun spinning device, which comprises a feeding unit, an auxiliary core-spun device and a spun yarn winding unit, wherein the feeding unit is used for feeding the spun yarn;
the feeding unit is used for feeding the core layer material and the outer coating material;
the auxiliary core-spun device comprises a core-spun winding mechanism, wherein the core-spun winding mechanism comprises a first yarn path for conveying outer-layer material, a second yarn path for conveying core-layer material and a wrapping point for wrapping confluence; the first yarn channel and the second yarn channel are crossed and merged at the wrapping point;
and the outer wrapping material is wrapped on the outer layer of the core layer material at the wrapping point to obtain the core-spun yarn, and then the core-spun yarn is transmitted to the spun yarn winding unit for twisting and winding.
As a further improvement of the present invention, the extension line of the second yarn path and the extension line of the fed core layer material are not in a straight line, so that the core layer material is fed into the second yarn path in a zigzag manner, the offset distance between the core layer material and the outer package material is adjusted, and simultaneously, the tension of the core layer material is increased, and the wrapping effect is improved.
As a further improvement of the invention, the extension line of the first yarn path and the extension line of the fed outer coating material are in the same straight line, which can generate the effect of hindering the twist transmission of the outer coating material and reduce the twist and the tension of the outer coating material.
As a further improvement of the invention, the core-spun winding mechanism further comprises a third yarn path for conveying the core-spun yarn, and the third yarn path and the second yarn path are in a straight line and form a Y-shaped structure with the first yarn path.
As a further improvement of the invention, the core-spun winding mechanism further comprises an air suction opening arranged at the wrapping point, and the auxiliary core-spun device comprises a negative pressure mechanism arranged at the air suction opening and used for applying negative pressure suction to the outer-coated material to improve the wrapping spinning effect.
As a further improvement of the invention, the core-spun yarn device also comprises an electrostatic spinning device which is arranged between the auxiliary core-spun device and the spun yarn winding unit and is used for spinning and covering a layer of nano fiber on the outer layer of the core-spun yarn to form the multi-component multi-layered structure core-spun yarn.
As a further improvement of the invention, the electrostatic spinning device comprises a needle head, an electrode plate and a high-voltage power supply; the core-spun yarn is transmitted to the spun yarn winding unit from the space between the electrode plates, and the needle head is arranged between the electrode plates and used for spraying and coating the nano-fiber spun by the electrostatic spinning to the outer layer of the core-spun yarn.
As a further improvement of the invention, the feeding unit comprises a bell mouth, a rear roller, a rear rubber roller, a middle roller and a middle rubber roller for feeding the outer coating material, a yarn guide wheel for guiding the core layer material, a front roller and a front rubber roller; the outer package material and the core layer material are respectively output from different positions of a jaw consisting of the front roller and the front rubber roller;
the spun yarn winding unit comprises a yarn guide hook, a steel wire ring, a ring and a spun yarn tube, the core-spun yarn enters the balloon twisting section through the yarn guide hook, the fiber on the outer layer of the core-spun yarn is further twisted and clasped in the process, and finally the core-spun yarn is wound on the spun yarn tube through the rotation of the steel wire ring on the ring.
The invention also provides a novel core-spun spinning method with a macro core fully wrapped structure, which adopts the core-spun spinning device to carry out core-spun spinning and specifically comprises the following steps:
s1'. feeding the core material and the sheath material from the feeding unit to the auxiliary core-wrapping device, respectively;
s2' the core material is transported from the second yarn path to the wrapping point, the outer covering material is transported from the first yarn path to the wrapping point, and is wrapped and wound to the outer layer of the core material under the action of the twist rotation and the self-twist of the core material to form the covering yarn;
and S3', winding the core-spun yarn on a ring bobbin through a yarn guide hook under the action of a balloon.
As a further improvement of the present invention, in step S2', the core-spun yarn passes through an electrospinning device, and a layer of nanofibers is coated on the outer layer of the core-spun yarn to form a multi-component multi-layered structure core-spun yarn;
the core layer is made of fiber filaments, and the outer coating is made of short fiber strands.
The invention has the beneficial effects that:
1. the invention provides a core-spun spinning device.A supplementary core-spun device is additionally arranged between a front roller jaw and a yarn guide hook of a common ring spinning frame. The twist produced by the balloon is prevented from being transmitted to the staple fiber strand section by the first yarn path of the auxiliary core-spun device, most of the twist is transmitted to the filament section, and the filament is kept in a straightened state in the twisting structure. And adjusting the offset distance between the filaments and the staple fiber strips through the second yarn channel, and simultaneously increasing the tension of the filaments. According to the arrangement, at the wrapping point, the filaments keep the straightening state in the twisting structure and are in the twisting leading position, the tension of the filament section is far greater than that of the short fiber whisker section, and therefore the situation that the core yarn is positioned in the center of the covering yarn and cannot generate core deviation in the yarn forming structure is ensured; the short fiber strand is in a state of weak twist and low tension at the wrapping point, and when the short fiber strand is twisted and wrapped, the short fiber overcomes the friction force and the smaller cohesive force among the fibers under the twisting action of the twist of the filament yarn, so that the short fiber strand is wrapped on the filament yarn to form the outer-layer wrapping fiber with good straightening degree. The formed core-spun yarn is coated with a layer of nano-fiber through the outer layer of an electrostatic spinning device to form a multi-component and multi-layered structure, and yarn hairiness is completely eliminated; after passing through the yarn guide hook, the yarn is further twisted and clasped by the outer layer fiber under the rotary twisting action of the balloon, and finally the cop is formed.
2. The auxiliary core-spun device is additionally provided with the side air suction structure, so that the core-spun structure can be smoothly carried out, uncontrolled floating fibers in fiber strands after the roving is drafted can be captured, the fiber strands are gathered at a wrapping point to form yarns smoothly, the generation of flying in the spinning process is reduced, the spinning environment is improved, and the recovery cost of the flying is reduced.
3. The short fibers can well wrap the long filaments under the method, and the short fiber strands at the wrapping point are not held by the roller, so that the formed covering yarn has excellent wrapping effect; the parallel straightness of the outer layer fiber is high, yarn hairiness is completely eliminated, the appearance effect of the ring spun core-spun yarn is greatly improved, and the yarn structure of the ring spun core-spun yarn is close to the core-spun yarn structure in an ideal state.
3. The invention is not limited to the short fiber wrapped filament, and the short fiber wrapped filament can be realized if the holding distance between the front rubber roller and the front roller on the ring spinning frame is increased, so that a multi-component short fiber layered structure is formed.
4. In the actual production of the novel structure core-spun spinning method with the fully wrapped macro cores, the core-spun yarn can be stably spun only by adding the auxiliary core-spun device between the front roller jaw and the yarn guide hook on the common ring spinning frame according to the set process parameters and adjusting the twisting structure of the auxiliary core-spun device to form a Y-shaped structure with straightened filaments; meanwhile, the auxiliary core-spun spinning device is only required to be removed when yarns with other structures are required to be spun. Therefore, the invention has simple structure for modifying the ring spinning frame in the actual production process, low modification cost and obvious effect of improving the performance of the ring spinning covering yarn.
Drawings
Fig. 1 is a schematic view of the overall structure of the core-spun spinning device of the invention.
Fig. 2 is a partial structure schematic diagram of the core-spun spinning device.
Fig. 3 is a schematic structural view of the core-winding state of the auxiliary core-winding device in fig. 1.
Fig. 4 is a schematic structural view of a core winding mechanism of the auxiliary core winding device in fig. 1.
Fig. 5 is a schematic cross-sectional view of the core winding mechanism of fig. 4.
Fig. 6 is a schematic structural view of the electrospinning device of fig. 1.
Fig. 7 is a schematic structural view of the electrospinning device of fig. 6 in a spinning state.
Reference numerals
S1 — core layer material; s2-outer wrapping material; s3-core spun yarn;
10-a feeding unit; 11-a bell mouth; 12-a back roller; 13-rear rubber roller; 14-middle roller; 15-a medium rubber roller; 16-a yarn guide wheel; 17-a front roller; 18-front rubber roller;
20-an auxiliary core-wrapping device; 21-core winding mechanism; 211-a first yarn path; 212-a second yarn path; 213-an air suction opening; 214-wrap point; 215-third yarn path; 22-a negative pressure mechanism;
30-an electrostatic spinning device; 31-a needle head; 32-an electrode plate; 33-a high voltage power supply;
40-spun yarn winding unit; 41-a yarn guide hook; 42-a traveler; 43-ring; 44-ring bobbin.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme of the present invention are shown in the specific embodiments, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1 to 7, the core-spun spinning device provided by the present invention is additionally provided with an auxiliary core-spun device 20 between a front roller nip and a yarn guide hook of a common ring spinning frame, and mainly comprises a feeding unit 10, the auxiliary core-spun device 20 and a spun yarn winding unit 40.
Referring to fig. 3 to 5, the auxiliary core-spun device 20 includes a core-spun winding mechanism 21, the core-spun winding mechanism 21 includes a first yarn path 211 for transmitting the sheath material S2 (staple fiber strand), a second yarn path 212 for transmitting the core material S1 (filament), and a wrapping point 214 for wrapping the confluence; the first yarn path 211 and the second yarn path 212 meet crosswise at a wrapping point 214. In the core-spun spinning method of the present invention, the twist formed by the balloon rotation is transferred from bottom to top, and the first yarn path 211 in the additional auxiliary core-spun device 20 functions as: the twist produced by the balloon is prevented from being transmitted to the staple fiber strand section, most of the twist is transmitted to the filament section, and the long yarn is kept in a straightened state in the twisting structure. The second yarn channel 212 in the added auxiliary core-spun device 20 has the following functions: the tension of the filament segments in the twisting structure is increased to make them dominate in the twisting process.
Particularly, the extension line of the second yarn path 212 and the extension line of the fed core layer material S1 are not in the same straight line, so that the core layer material S1 is fed into the second yarn path 212 in a broken line form, the offset distance between the core layer material S1 and the outer package material S2 is adjusted, and meanwhile, the tension of the core layer material S1 is increased, so that the filaments are in a straight state at a wrapping point, and the wrapping effect is improved.
The extension line of the first yarn path 211 and the extension line of the fed outer coating material S2 are on the same straight line, so that the effect of hindering the twist transmission of the outer coating material S2 is generated, and the twist and the tension of the outer coating material S2 are reduced.
The core winding mechanism 21 further includes a third yarn path 215 for transmitting the core yarn S3, the third yarn path 215 and the second yarn path 212 are in a straight line, and form a "y" shape structure with the first yarn path 211. The short fiber whisker segment only obtains a small amount of twist under the action of the first yarn path 211, and most of twist is transmitted to the filaments in the second yarn path 212, so that the twist and the tension of the filament segment are far greater than those of the short fiber whisker segment, and a Y-shaped twisting structure in which the filaments are in a straight state is formed.
With this arrangement, a different twisting structure from that of the conventional ring spun core yarn can be adopted in the ring spinning frame, the core material S1 is transferred from the second yarn path 212 to the wrapping point 214, and the sheath material S2 is transferred from the first yarn path 211 to the wrapping point 214. Under the action of the first yarn path 211 and the second yarn path 212, the core layer material S1 at the wrapping point 214 is in a straightened state, the twist and the tension are high, and the twist and the tension of the outer layer material S2 are low. Accordingly, the covering yarn S3 is formed by being wrapped and wound to the outer layer of the core material S1 by the twist rotation of the core material S1 and the twist thereof. The filaments are kept in a straightening state in a twisting structure and are in a twisting leading position, and the tension of the filament section is far greater than that of the short fiber whisker section, so that the condition that the core yarn is positioned at the center of the core-spun yarn in a yarn forming structure and core deviation is avoided; the short fiber strips are in a state of weak twist and low tension at the wrapping points, and when the short fiber strips are twisted and wrapped, the friction force and the smaller cohesive force among the fibers are overcome under the twisting action of the twist of the filaments, so that the short fiber strips are wrapped on the filaments to form the outer-layer wrapping fibers with good straightening degree.
In particular, the core-spun winding mechanism 21 further includes an air suction opening 213 disposed at the wrapping point 214, and the auxiliary core-spun device 20 includes a negative pressure mechanism 22 disposed at the air suction opening 213 for applying a negative pressure suction force to the drafted outer-layer material S2 to ensure smooth spinning; and capture uncontrolled floating fibers in the short fiber strands, so that the fibers are gathered to the wrapping point 214 to participate in yarn formation, and fly generated in the spinning process is reduced.
Specifically, as shown in fig. 6-7, the core-spun yarn apparatus further includes an electrostatic spinning device 30 disposed between the auxiliary core-spun device 20 and the spun yarn winding unit 40, for spinning a layer of nanofibers on the outer layer of the core-spun yarn S3 to form a multi-component multi-layered structure core-spun yarn, and then transferring the multi-component multi-layered structure core-spun yarn to the spun yarn winding unit 40 for twisting and winding, and further twisting and clasping the outer layer of fibers by the revolving twisting action of the balloon through the yarn guide hook 41 to finally form a tubular yarn. Specifically, the electrospinning device 30 includes a needle 31, an electrode plate 32, and a high voltage power supply 33; the core-spun yarn S3 is transferred from between the electrode plates 32 to the spun yarn winding unit 40, and a needle 31 is disposed between the electrode plates 32 for spray-coating the electrospun nanofiber onto the outer layer of the core-spun yarn S3.
By such arrangement, the nanofibers spun by the electrostatic spinning device 30 are sprayed onto the core-spun yarn S3, and due to the twisting rotation of the core-spun yarn S3, the nanofibers are wrapped on the surface layer of the core-spun yarn S3 to form a multi-component layered structure, and the originally exposed yarn hairiness is attached to the core-spun yarn S3 main body, so that the effect of completely eliminating the hairiness can be achieved.
Specifically, referring to fig. 1, the feeding unit 10 includes a bell mouth 11 for feeding the outer layer material S2, a rear roller 12 and a rear rubber roller 13, a middle roller 14 and a middle rubber roller 15, a yarn guide wheel 16 for guiding the core layer material S1, and a front roller 17 and a front rubber roller 18; the outer layer material S2 and the core layer material S1 are respectively output from different positions of a nip composed of the front roller 17 and the front rubber roller 18.
The spun yarn winding unit 40 includes a yarn guide hook 41, a traveler 42, a ring 43, and a spun yarn tube 44, the core spun yarn S3 enters the balloon twisting section through the yarn guide hook 14, the fiber of the core spun yarn outer layer is further twisted and clasped in this process, and finally wound onto the spun yarn tube 17 through the rotation of the traveler 42 on the ring 43.
Specifically, in one embodiment, the invention further provides a core-spun spinning method with a novel structure and a macro core fully wrapped, which comprises the following specific steps:
the invention adds an auxiliary core-spun device 20 and an electrostatic spinning device 30 between a nip formed by a front roller 17 and a front rubber roller 18 of a common ring spinning frame and a yarn guide hook 41.
In the spinning process, roving is drafted and output at a position, which is slightly to the right, of a jaw formed by a front roller 17 and a front rubber roller 18 through a rear roller 12, a rear rubber roller 13, a middle roller 14 and a middle rubber roller 15 through a horn mouth 11, and certain weak twist is obtained at the jaw and is converged with filaments at a wrapping point 214 through a first yarn channel 211 in an auxiliary core-spun device 20. The filament is output from the left part of the nip formed by the front roller 17 and the front rubber roller 18 through the yarn guide wheel 16, and is merged with the short fiber strand at the wrapping point 214 under the action of the second yarn channel 212 in the auxiliary core-spun device 20.
At the wrapping point 214, due to the action of the first yarn path 211 and the second yarn path 212, a y-shaped twisting structure is formed between the filaments and the staple fiber strands, wherein the filaments are in an unbent state; meanwhile, the floating fibers of the short fiber whisker segment are gathered at the wrapping point 214 under the action of the side air suction opening 213 to participate in spinning and twisting, so that flying is reduced. The strips of staple fibers are twisted and wrapped on the outer layer of the filaments under the action of the twist of the filaments and the twist of the filaments to form the covering yarn S3.
The formed core-spun yarn S3 passes through the electrostatic spinning device 30 (comprising a needle 31, an electrode plate 32 and a high-voltage power supply 33), so that the nanofiber sprayed out from the needle 31 under the action of high voltage is wrapped on the surface layer of the core-spun yarn S3, and the core-spun yarn with a multi-component and multi-layered structure is formed. Subsequently, the core yarn S3 enters the balloon twisting stage through the yarn guide 41, and the fibers of the outer layer thereof are further twisted and held tightly in the process, and finally wound onto the ring tube 44 through the rotation of the traveler 42 on the ring 43.
In FIG. 2, after being output by a nip formed by a front roller 17 and a front rubber roller 18, filaments and rovings form an inner core yarn with middle and higher twist under the action of an auxiliary core-spun device 20; the outer layer short fiber is wrapped in a belt shape to form a core-spun yarn structure with lower twist.
During the spinning process, the twist of the outer layer fiber of the core yarn is the smallest at the wrapping point 214, and the lower the core yarn is, the more twist the outer layer covered fiber gets, which makes the outer layer fiber of the formed core yarn S3 further twist and hold tightly, thereby forming the core yarn S3 with excellent covering effect and high parallel straightening degree of the outer layer fiber.
In particular, the core material S1 is a fiber filament, and the sheath material S2 is a chopped strand. When the average length of the short fiber strand is 30-40mm, the upper surface of the auxiliary core-spun device 20 is 10-13 mm away from the jaw of the front roller 17, and the center of the auxiliary core-spun device 20 is deviated to the left side by about 10mm compared with the center of the front roller 17.
In summary, the core-spun spinning device and the core-spun spinning method with the new structure of completely wrapping the macro cores provided by the invention are characterized in that an auxiliary core-spun device is additionally arranged between a front roller jaw and a yarn guide hook of a common ring spinning frame. The twist produced by the balloon is prevented from being transmitted to the staple fiber strand section by the first yarn path of the auxiliary core-spun device, most of the twist is transmitted to the filament section, and the filament is kept in a straightened state in the twisting structure. And adjusting the offset distance between the filaments and the staple fiber strips through the second yarn channel, and simultaneously increasing the tension of the filaments. According to the arrangement, at the wrapping point, the filaments keep the straightening state in the twisting structure and are in the twisting leading position, the tension of the filament section is far greater than that of the short fiber whisker section, and therefore the situation that the core yarn is positioned in the center of the covering yarn and cannot generate core deviation in the yarn forming structure is ensured; the short fiber strand is in a state of weak twist and low tension at the wrapping point, and when the short fiber strand is twisted and wrapped, the short fiber overcomes the friction force and the smaller cohesive force among the fibers under the twisting action of the twist of the filament yarn, so that the short fiber strand is wrapped on the filament yarn to form the outer-layer wrapping fiber with good straightening degree. The formed core-spun yarn is coated with a layer of nano-fiber through the outer layer of the electrostatic spinning device to form a multi-component and multi-layered structure, and yarn hairiness is completely eliminated. The device has the advantages of ingenious structure, reasonable method, convenient use, low modification cost and obvious effect of improving the performance of the ring spun core-spun yarn. According to the invention, the cotton fiber is coated on the outer layer of the silver-plated filament, then the silver-plated filament is sprayed with the polyurethane nano-wire screen for coating, the volume ratio of the silver-plated filament completely coated in the yarn body of the finally prepared yarn is up to 47.2%, compared with the ring-shaped filament core-spun yarn with the same specification, the wet strength is improved by more than 12%, the dry strength is improved by more than 5%, the hairiness of the yarn body is reduced by more than 90%, and the yarn evenness is obviously improved.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. A core-spun spinning device is characterized by comprising a feeding unit (10), an auxiliary core-spun device (20) and a spun yarn winding unit (40);
the feeding unit (10) is used for feeding a core layer material (S1) and an outer layer material (S2);
the auxiliary core wrapping device (20) comprises a core wrapping mechanism (21), the core wrapping mechanism (21) comprises a first yarn path (211) for transmitting the outer layer material (S2), a second yarn path (212) for transmitting the core layer material (S1) and a wrapping point (214) for wrapping confluence; said first yarn path (211) and said second yarn path (212) meeting crosswise at said wrapping point (214);
the outer layer material (S2) is coated on the outer layer of the core layer material (S1) at the wrapping point (214) to obtain the core-spun yarn (S3), and then the core-spun yarn is transmitted to the spun yarn winding unit (40) for twisting winding.
2. Core-spun spinning apparatus according to claim 1, characterized in that the extension of the second yarn path (212) is not in line with the extension of the fed core material (S1) so that the core material (S1) is fed into the second yarn path (212) in a zigzag form to adjust the offset distance of the core material (S1) and the outer covering material (S2) and at the same time increase the tension of the core material (S1) to improve the wrapping effect.
3. Core-spun spinning device according to claim 2, characterized in that the extension of the first yarn path (211) and the extension of the fed outer covering material (S2) are in a straight line, which acts as a barrier to the twist transmission of the outer covering material (S2) and reduces the twist and tension of the outer covering material (S2).
4. A core-spun spinning apparatus as claimed in claim 1, characterized in that the core-spun winding mechanism (21) further comprises a third yarn path (215) for transporting the core-spun yarn (S3), the third yarn path (215) being in line with the second yarn path (212) and forming a "y" shaped structure with the first yarn path (211).
5. A core-spun spinning apparatus according to claim 1, characterized in that the core-spun winding mechanism (21) further comprises an air suction opening (213) arranged at the wrapping point (214), and the auxiliary core-spun device (20) comprises a negative pressure mechanism (22) arranged at the air suction opening (213) for applying negative pressure suction to the outer covering material (S2) for improving the wrapping spinning effect.
6. A core-spun spinning apparatus according to any of the claims 1 to 5, characterized in that it further comprises an electrospinning device (30) arranged between the auxiliary core-spun device (20) and the spun yarn winding unit (40) for spinning a layer of nanofibers covering the outer layer of the core-spun yarn (S3) to form a multicomponent multi-layered structure core-spun yarn.
7. Core-spun spinning apparatus according to claim 6, characterized in that the electrospinning apparatus (30) comprises a needle (31), an electrode plate (32) and a high voltage power supply (33); the core-spun yarn (S3) is transmitted to the spun yarn winding unit (40) from between the electrode plates (32), and the needle head (31) is arranged between the electrode plates (32) and is used for spraying and coating the nano-fiber spun by static electricity to the outer layer of the core-spun yarn (S3).
8. A core-spun spinning device according to claim 1, characterized in that the feeding unit (10) comprises a bell mouth (11), a rear roller (12) and a rear rubber roller (13), a middle roller (14) and a middle rubber roller (15) for feeding the outer covering material (S2), a yarn guide wheel (16) for guiding the core material (S1) and a front roller (17) and a front rubber roller (18); the outer layer material (S2) and the core layer material (S1) are respectively output from different positions of a nip formed by the front roller (17) and the front rubber roller (18);
the spun yarn winding unit (40) comprises a yarn guide hook (41), a steel ring (42), a ring (43) and a spun yarn tube (44), the core-spun yarn (S3) enters a balloon twisting section through the yarn guide hook (14), the fiber of the outer layer of the core-spun yarn is further twisted and clasped in the process, and finally the core-spun yarn is wound on the spun yarn tube (17) through the rotation of the steel ring (42) on the ring (43).
9. A new structure core-spun spinning method of macro core full wrapping, characterized in that the core-spun spinning device of any claim 1 to 8 is adopted for core-spun spinning, which comprises the following steps:
s1'. feeding the core material (S1) and the outer layer material (S2) from the feeding unit (10) to the auxiliary core-spun device (20), respectively;
s2', the core material (S1) being transported from the second yarn path (212) to the wrapping point (214), the outer cover material (S2) being transported from the first yarn path (211) to the wrapping point (214), being wrapped around to the outer layer of the core material (S1) under the action of the twist rotation and self-twist of the core material (S1) to form a core yarn (S3);
s3', the core-spun yarn is wound on a ring bobbin (44) through a yarn guide hook (41) under the action of a balloon.
10. A macro-core fully wrapped new structure core spun yarn as claimed in claim 9, characterized in that, in step S2', the core spun yarn (S3) passes through an electrospinning device (30) and is covered with a layer of nano-fiber to form a multi-component multi-layered structure core spun yarn;
the core layer material (S1) is fiber filament, and the outer coating material (S2) is short fiber strand.
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