CN111411432B - Composite-structure sisal hemp core-spun multi-strand yarn and production process thereof - Google Patents
Composite-structure sisal hemp core-spun multi-strand yarn and production process thereof Download PDFInfo
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- CN111411432B CN111411432B CN202010241595.5A CN202010241595A CN111411432B CN 111411432 B CN111411432 B CN 111411432B CN 202010241595 A CN202010241595 A CN 202010241595A CN 111411432 B CN111411432 B CN 111411432B
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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
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/04—Blended or other yarns or threads containing components made from different materials
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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
- 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
- D02G3/362—Cored or coated yarns or threads using hollow spindles
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- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
- D10B2201/01—Natural vegetable fibres
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
- D10B2201/20—Cellulose-derived artificial fibres
- D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions
- D10B2201/24—Viscose
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/14—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polycondensates of cyclic compounds, e.g. polyimides, polybenzimidazoles
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/06—Load-responsive characteristics
- D10B2401/063—Load-responsive characteristics high strength
Abstract
The invention discloses a sisal hemp core-spun multi-strand yarn with a composite structure and a production process thereof, which realize the integration of spinning and twisting and shorten the process flow. The core-spun multi-ply yarn comprises 3 sisal hemp coated yarns and 1 core yarn, wherein the core yarn of the 3 sisal hemp coated yarns is the sisal hemp yarn, the coated yarn is a low-twist polyimide fiber filament and a viscose fiber filament which are twisted together, and the core yarn is a low-twist carbon fiber filament, so that the carbon fiber strength is high, and the yarn strength is favorably improved. The sisal hemp of the invention belongs to hard fiber, in the core-spun multi-ply yarn, the sisal hemp fiber is coated by the coating silk, twisting is carried out during ply yarn, the fiber twist is less, and not only can a compact yarn structure be obtained, but also better strength can be obtained. The coating silk of the invention adopts the polyimide fiber filament and the viscose filament to be twisted, so that the coating silk can obtain larger strength, and the viscose filament is mixed to adsorb a certain amount of grease, thereby being beneficial to the transfer of the grease between the yarn core and the surface.
Description
Technical Field
The invention belongs to the field of yarn production, and particularly relates to a sisal hemp core-spun multi-ply yarn with a composite structure and a production process thereof.
Background
The sisal fiber has the characteristics of long fiber, pure white color, tough texture, high elasticity, high strength, good wear resistance and the like, can be used for preparing various sisal products with the characteristics of friction resistance, acid and alkali resistance, corrosion resistance and difficult slipping, and can be used for preparing ropes, polishing wheels, carpets, sisal wallpaper, steel wire rope cores, paper currency, artware and the like. The sisal fiber is used as hard fiber, the length is generally between 60 and 120cm, and sisal yarn is mainly spun by adopting sisal spinning special equipment. Due to the unique performance characteristics of sisal fibers, sisal fibers cannot be mixed with other fibers for spinning. In order to realize fiber mixing, filaments or yarns of other fibers and sisal fibers are mainly used, and the mixed yarns are realized by adopting methods such as core spun yarns or sirofil spinning and twisting. Sisal blended spinning related references are as follows:
a steel wire rope composite sisal hemp rope core for an elevator and a preparation method thereof (zl201910088680.X) disclose a steel wire rope composite sisal hemp rope core for an elevator and a preparation method thereof, wherein sisal hemp, aramid fiber and stainless steel wires are adopted as raw materials to be woven, the composite material rope core is formed by twisting 36 sisal hemp composite core strands for multiple times, and each sisal hemp composite core strand is composed of sisal hemp filaments, palm filaments and aramid fiber/stainless steel core yarns in a certain proportion.
The high-strength and light-weight steel wire composite rope core for the elevator and the preparation method thereof (zl201910088684.8) disclose a high-strength and light-weight steel wire composite rope core for the elevator and the preparation method thereof, wherein hemp, ultra-high molecular weight polyethylene and basalt fiber are adopted as raw materials for weaving, the composite rope core is formed by twisting 36 hemp composite core strands for multiple times, and each hemp composite core strand is composed of hemp filaments, adsorption fibers and ultra-high molecular weight polyethylene/basalt core-spun yarns in a certain proportion.
A novel steel wire rope core and a production method (201910401818.7) thereof disclose a novel steel wire rope core and a production method thereof, comprising the following steps: picking up ramie → combing ramie (adding water) → drawing → spinning → stranding (soaking oil) → rope twisting → warehousing. The spinning machine adopts a sisal hemp spinning machine which is technically improved, the drafting part adopts a drafting system of a TGS0950 type sisal hemp spinning machine, and the twisting part is improved into a twisting roller type self-twisting spinning twisting winding device: feeding raw materials, namely sisal fiber, and chemical fiber filament, to form self-twisting spinning of the chemical fiber filament and the sisal fiber, and twisting, oiling and rope making. High-strength high-modulus low-elongation polyester filament yarns and ultrahigh molecular weight polyethylene filament yarns are added in the spinning process respectively, wherein the ultrahigh molecular weight polyethylene filament yarns are pretreated, and both the polyester filament yarns and the ultrahigh molecular weight polyethylene filament yarns are trilobal structural sections. The drafting system of the spinning machine feeds two yarns in parallel, wherein one sisal fiber yarn is fed and drafted by the drafting system, and the other chemical fiber filament yarn is directly fed from a front roller.
A novel oil-containing steel wire rope core with a sisal/synthetic fiber composite structure and a preparation method (zl201910401819.1) thereof disclose the novel oil-containing steel wire rope core with the sisal/synthetic fiber composite structure and the preparation method thereof, and the method comprises the following steps: step one, forming sisal/terylene siro-like-film yarns; step two, forming high-strength high-modulus low-elongation polyester filament yarns; step three, forming ultra-high molecular weight polyethylene filament yarns; step four, forming a sisal hemp/terylene siro-film yarn and a terylene yarn plied yarn; step five, forming a sisal/terylene siro-film yarn and an ultrahigh molecular weight polyethylene yarn strand; and step six, forming a novel steel wire rope core with a sisal/synthetic fiber composite structure.
The four patent documents respectively introduce four sisal hemp blended yarns, the production process mainly comprises the procedures of sisal hemp spinning, twisting, rope twisting and the like, and the sisal hemp blended yarns are mainly realized by methods of core-spun yarns, Sirofil spinning, doubling and the like by adopting chemical fiber filaments and sisal hemp fibers.
The hollow spindle processing mode is generally used for fancy twisting machines, and the production principle is that core yarns are conveyed by a core yarn roller and enter the hollow spindle by a yarn guide roller; the decoration yarn enters a hollow spindle after passing through a drafting mechanism; the solid yarn is led out from the hollow spindle bobbin and enters the hollow spindle together. 3 yarns are fed simultaneously, before the twisting hook, the core yarn and the decoration yarn rotate together with the hollow spindle to obtain false twist, and the fixed yarn is parallel to the core yarn and the decoration yarn but not false twisted due to unwinding from the hollow spindle; after the twisting hook is added, the false twisting of the core yarn and the decoration yarn disappears, and the fixing yarn is wrapped on the core yarn and the decoration yarn to fix the decoration yarn to form the fancy yarn.
A twice-wrapped yarn and its production method (ZL201610899344.X) provides a twice-wrapped yarn and its production method, the yarn comprises an inner core layer and an outer covering layer, the inner core layer comprises two parallelly arranged once-wrapped yarns, and the outer covering layer tightly wraps the inner core layer. The twice-wrapped yarn provided by the scheme adopts a hollow spindle to perform twice-wrapped spinning, the spinning method is the same, the yarn structure comprises an inner core layer and an outer cladding layer, and the surface of the core layer is wrapped by wrapped fibers to form the outer cladding layer.
In order to shorten the sisal hemp spinning production flow and improve the production efficiency, aiming at the condition that the sisal hemp fiber belongs to hard fiber and is longer and suitable for being used as core yarn, the invention applies the hollow spindle twisting and cladding technology in the fancy twisting machine to the sisal hemp spinning technology, and designs a composite structure core-spun multi-ply yarn and a production process thereof by using the sisal hemp fiber as the core yarn.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides a sisal hemp core-spun multi-strand wire with a composite structure and a production process thereof.
The technical scheme is as follows: a composite structure sisal hemp core-spun multi-plied yarn comprises A yarns, B yarns, C yarns and D core yarns; the yarn A, the yarn B and the yarn C are sisal hemp coated yarns, core yarns of the yarn A, the yarn B and the yarn C are sisal hemp fibers, and low-twist polyimide fiber filaments and viscose fiber filaments are twisted together to form a yarn, wherein the surface of the yarn A, the surface of the yarn B and the surface of the yarn C are coated with low-twist polyimide fiber filaments and viscose fiber filaments; the D core wire is a low-twist carbon fiber filament. The twisting coefficient of the low-twist polyimide fiber filament and the viscose filament which are twisted together is 160-240; the twist factor of the low-twist carbon fiber filaments is 80-180.
The production process of the sisal hemp core-spun multi-strand wire with the composite structure comprises the following steps:
the method comprises the following steps that firstly, sisal fiber strips fed into a spinning machine are properly carded and drafted, fibers are gathered through a yarn guide tube to form smooth fiber strips, the fiber strips enter a hollow spindle, and low-twist polyimide fiber filaments and viscose fiber filaments are twisted and coated to form sisal coated yarns A, B and C along with the rotation of the hollow spindle; twisting the carbon fiber filaments to form low-twist carbon fibers, wherein the twisting direction of the low-twist carbon fibers is opposite to that of the plied yarns to form core filaments D;
and step two, the three covering yarns A, B, C and the core filament D enter a yarn guide hole specified by the yarn inlet plate, are twisted by the rotation of a spindle to form a core-spun multi-strand yarn, and then are wound on a bobbin.
As an optimization: the specific operation of the first step is as follows: the specific operation of the first step is as follows: the sisal hemp strip is led out from the strip barrel and is fed into a rear roller through a guide strip bell mouth, the sisal hemp strip is conveyed to a front roller through the rear roller, three yarn guide rods are pressed above the sisal hemp strip between the front roller and the rear roller, a front carding roller and a rear carding roller are arranged below the sisal hemp strip, carding needles are arranged on the surface of the carding rollers and are inclined towards the rear of the rotation direction of the carding rollers, fibers are prevented from being grabbed when the carding needles comb the fibers, and a brush cleaning roller is arranged below the carding rollers; the carded sisal hemp strips enter a front roller through a buncher, are output from the front roller, pass through a yarn guide tube and then are vertically sent into a hollow spindle; the hollow spindle rotates, the low-twist polyimide fiber filaments and the viscose fiber filaments which are arranged on the hollow spindle are twisted and wrapped on the surface of the sisal fiber strip along with the rotation of the spindle, and the sisal fiber strip wraps the filament fibers to form wrapping yarns A, B and C.
As an optimization: the back roller is divided into an upper roller and a lower roller, the upper roller is a convex roller, and the lower roller is a concave roller.
As an optimization: the front roller is divided into an upper roller and a lower roller, the upper roller is a convex roller, and the lower roller is a concave roller.
As an optimization: the front carding roller and the rear carding roller have different speeds, the surface linear speed of the rear carding roller is 0.5-2 times of that of the rear roller, and the surface linear speed of the front carding roller is 2-5 times of that of the rear carding roller.
As an optimization: the card wire angle beta of the front and the rear carding rollers is 5-45 degrees.
As an optimization: the specific operation of the second step is as follows: after the sisal hemp strips are coated with the filaments, coating yarns A, B and C are formed and enter a yarn inlet plate through a yarn guide roller; the sisal hemp spinning and twisting integrated machine is divided into A, B, C spinning systems which are completely the same, three wrapping yarn A yarns, three wrapping yarn B yarns and three wrapping yarn C yarns are respectively formed, the yarn A yarns, the yarn B yarns and the yarn C yarns respectively enter three holes A, B and C of a corresponding yarn feeding plate, and D core yarns are led out from a yarn drum and then enter a central hole D of the corresponding yarn feeding plate; the surface of the yarn feeding plate is provided with four holes A, B, C and D, wherein the three holes A, B and C are distributed in an equilateral triangle, and the other hole D is positioned in the center of the three holes; the yarn A, the yarn B, the yarn C and the yarn D enter a spindle top hole vertically below through a yarn inlet plate, the spindle rotates to twist the four yarns, the yarn D is at the center and is wrapped by the yarn A, the yarn B and the yarn C, the spindle is in motion fit with the bobbin, and the twisted yarn is wound on the bobbin to form the sisal core-spun multi-strand yarn.
Has the advantages that: the specific advantages of the invention are as follows:
1. the invention realizes the integration of spinning and twisting, shortens the spinning process flow and improves the production efficiency.
2. The core-spun multi-plied yarn based on the unique structure is formed, wherein the plied yarn is provided with single yarn and core yarn, and the single yarn is provided with the core yarn and the cladding yarn.
3. The core wire carbon fiber has high strength and high fiber rigidity, is not suitable for excessive twisting and bending, is processed by low twist and then is used as the core wire and the cladding yarn to be twisted reversely, can increase the friction force between the core wire and the cladding yarn, and plays a role in high strength.
4. The sisal hemp of the invention belongs to hard fiber, is coated by the coating silk in the core-spun multi-ply yarn, is twisted during ply yarn, has little fiber twist, can obtain compact yarn structure and better strength.
5. The coated yarn adopts low-twist polyimide fiber filaments and viscose filament filaments which are twisted together, so that high strength can be obtained, and a certain amount of grease can be adsorbed due to the mixed use of the viscose, so that the grease of the sisal core yarn can be transferred inside and outside.
6. According to the invention, through adopting the cladding spinning for the sisal yarn, the hairiness of the sisal yarn can be effectively reduced, and the yarn strength can be effectively improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the specific structure of the yarn feeding plate of the present invention;
FIG. 3 is a schematic view showing the detailed structure of the front and rear rollers of the present invention;
FIG. 4 is a schematic view of the arrangement of carding wires of the carding roller of the invention.
In the figure, 1, a barrel; 2. a horn mouth of the conducting bar; 3. a back roller; 4. a yarn guide bar; 5. a rear carding roller; 6. a front carding roller; 7. cleaning the brush; 8. a buncher; 9. a front roller; 10. a yarn guide tube; 11. a hollow spindle; 12. a yarn leading roller; 13. a core wire barrel; 14. a yarn feeding plate; 15. a spindle; 16. a bobbin; A. a hole A; B. b hole; C. c hole; D. and (D) holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Examples
As shown in figures 1-4, the sisal hemp strip is drawn out from a barrel 1, fed into a rear roller 3 through a guide strip bell mouth 2, and conveyed to a front roller 9 by the rear roller 3, wherein the front roller and the rear roller are both composed of an upper roller and a lower roller, the upper roller is a convex roller, the lower roller is a concave roller, and the specific structure is shown in figure 3.
Three yarn guide rods 4 are arranged above the sisal strips and pressed above the sisal strips between a front roller 9 and a rear roller 3, a rear carding roller 5 and a front carding roller 6 are arranged below the sisal strips, carding needles are arranged on the surface of the carding rollers and incline to beta angles towards the rear of the rotation direction of the carding rollers, so that fibers are prevented from being grabbed when the carding needles comb the fibers, the speed of the front carding roller and the speed of the rear carding roller are different, the linear speed of the surface of the rear carding roller 5 is 0.5-2 times of that of the rear roller, the linear speed of the surface of the front carding roller 6 is 2-5 times of that of the rear carding roller, and a cleaning brush 7 is arranged below the carding rollers; the carded sisal hemp strips pass through a buncher 8 and enter a front roller 9, are output from the front roller 9 and pass through a yarn guide tube 10, and then are vertically fed into a hollow spindle 11. The hollow spindle 11 rotates, and the filament mounted on the hollow spindle 11 is wrapped on the surface of the sisal fiber yarn along with the rotation of the hollow spindle 11. After covering the filament fiber, the sisal strip forms a covering yarn, and the covering yarn enters the yarn inlet plate 14 through the yarn guide roller 12;
the carding needles of the carding roller are reversely inclined towards the rotating direction of the carding roller, and the inclination angle is beta which is 5-30 degrees.
The sisal fibers conveyed by the rear roller 3 move forwards under the traction of the front roller 9, the fast sisal fibers are drawn out from gaps between needle teeth of the slow carding roller, the reversely configured needle teeth comb the sisal fibers, and the front and rear carding rollers gradually and gradually comb, so that the carding effect is improved. The length of the sisal fibers is between 60 and 140 centimeters, and the hard long fibers are suitable for carding. The carding roller and the sisal fibers move in the same direction, and the carding roller needle teeth and the carding roller moving direction are reversely configured, so that the condition that the sisal fibers are embedded into the needle teeth to block the needle teeth can be reduced.
The surface of the yarn feeding plate 14 is provided with four holes A, B, C and D, wherein three holes A, B and C are distributed in an equilateral triangle, and the other hole D is positioned in the center of the three holes; the distribution of the four holes of the yarn feeding plate is shown in figure 2.
The sisal hemp spinning machine divides A, B, C completely identical spinning systems to respectively form three cladding yarns A, B and C, the three yarns A, B and C respectively enter three holes A, B and C of the corresponding yarn feeding plate 14, and the core silk D is led out from the core silk barrel 13 and then enters a center hole D of the corresponding yarn feeding plate 14;
A. b, C, D four yarns pass through the yarn feeding plate 14 and enter the top hole of the spindle 15 vertically below, the spindle 15 rotates to twist the four yarns, and the core yarn D is at the center and is wrapped by A, B, C three yarns. The spindle 15 is matched with the bobbin 16 in a moving way, and the twisted yarn is wound on the bobbin 16 to form the sisal core-spun multi-strand yarn.
The sisal hemp spinning machine with the composite structure realizes the integration of sisal hemp spinning and twisting, and finishes spinning and twisting through a plurality of steps. Wherein: the novel sisal core-spun multi-folded yarn comprises a yarn A, a yarn B, a yarn C and a yarn D, wherein the yarn A, the yarn B and the yarn C are sisal covered yarns, the core yarns of the yarn A, the yarn B and the yarn C are sisal fibers, and the surfaces of the yarn A, the yarn B and the yarn C are covered by low-twist polyimide fiber filaments and viscose fiber filaments which are twisted together; the D core yarn is a low-twist carbon fiber filament.
The yarn feeding plate is used for fixing the positions of the four yarns to ensure that the core yarn is in the center position, and the core yarn is wrapped by the three yarns of the yarn A, the yarn B and the yarn C in the center of the multi-strand yarn in the twisting process.
The core yarn of the covering yarn is made of sisal fiber, the covering fiber is made of low-twist polyimide fiber filaments and viscose fiber filaments in a doubling and twisting mode, the sisal fiber has a porous structure, the oil absorption performance is good, the corrosion resistance is good, the polyimide fiber filaments and the viscose fiber filaments in the doubling and twisting mode have the oil absorption performance, and meanwhile due to the existence of fiber gaps of the doubling and twisting, oil can be transferred and exchanged inside and outside. The surface of the coated yarn is provided with the fiber with good oil absorption performance, so that the coated yarn can exchange oil with the core fiber sisal, release oil under the condition of pressure and absorb oil under the condition of no pressure, has the functions of releasing and absorbing oil, and ensures that a certain amount of oil is contained.
The draft section of the present invention is as follows: the front carding roller and the rear carding roller are different in speed, the front carding roller is faster, and the rear carding roller is slower; carding rollers adopt card wires, the card wire inclination direction is backward (namely, the card wire inclination direction is backward towards the rotation direction), namely, sisal fibers can be properly carded, and the possibility that the card wires grab the fibers is reduced.
After the sisal fiber strips are drafted, fiber aggregation is carried out through a yarn guide tube to form smooth fiber strips, the smooth fiber strips enter a hollow spindle, and the smooth fiber strips are coated by filament fibers rotating along with the hollow spindle to form a coated yarn. Wherein: A. b, C the three coated yarns are coated by the polyimide fiber filament and the viscose fiber filament by twisting; the D-core filament adopts carbon fiber filament.
The three covering yarns A, B, C and the core yarn D enter a yarn guide hole specified by the yarn inlet plate, then the core-spun multi-strand yarn is formed by spindle rotation and twisting, and then the core-spun multi-strand yarn is wound on a bobbin.
The specific embodiment is as follows:
raw materials: the sisal strips and the core yarn are 1200D low-twist carbon fiber filaments (the twist is 10 twists/10 cm), the coating yarn is 600D polyimide fiber filaments and 300D viscose fiber filaments, and the filaments are twisted together (the twist is 20 twists/10 cm).
The spinning process comprises the following steps:
the sisal sliver specification is 16g/m, and the drafting multiple of the spinning machine is 20 times;
front roller: front carding roller: a rear carding roller: the linear speed ratio of the rear roller is as follows: 20: 5: 1: 1;
the speed of the front roller of the spinning machine is 35m/min, the speed of the hollow spindle is 4000r/min, and the speed of the spinning spindle is 1000 r/min.
The sisal hemp core-spun multi-strand wire has the specification that: 2.85 g/m.
The invention discloses a sisal hemp core-spun multi-strand yarn with a composite structure and a production process thereof, which realize the integration of spinning and twisting and shorten the process flow. The core-spun multi-ply yarn comprises 3 sisal hemp coated yarns and 1 core yarn, wherein the core yarn of the 3 sisal hemp coated yarns is the sisal hemp yarn, the coated yarn is a low-twist polyimide fiber filament and a viscose fiber filament which are twisted together, and the core yarn is a low-twist carbon fiber filament, so that the carbon fiber strength is high, and the yarn strength is favorably improved. The sisal hemp of the invention belongs to hard fiber, in the core-spun multi-ply yarn, the sisal hemp fiber is coated by the coating silk, twisting is carried out during ply yarn, the fiber twist is less, and not only can a compact yarn structure be obtained, but also better strength can be obtained. The coating silk of the invention adopts the polyimide fiber filament and the viscose filament to be twisted, so that the coating silk can obtain larger strength, and the viscose filament is mixed to adsorb a certain amount of grease, thereby being beneficial to the transfer of the grease between the yarn core and the surface.
Claims (8)
1. The utility model provides a composite construction sisal hemp covering core strand which characterized in that: the sisal core-spun multi-ply yarn consists of yarn A, yarn B, yarn C and core yarn D; the yarn A, the yarn B and the yarn C are sisal hemp coated yarns, core yarns of the yarn A, the yarn B and the yarn C are sisal hemp fibers, and low-twist polyimide fiber filaments and viscose fiber filaments are twisted together to form a yarn, wherein the surface of the yarn A, the surface of the yarn B and the surface of the yarn C are coated with low-twist polyimide fiber filaments and viscose fiber filaments; the D core wire adopts low-twist carbon fiber filaments, and the twist coefficient of the low-twist polyimide fiber filaments and the viscose filament twisted together is 160-240; the twist factor of the low-twist carbon fiber filaments is 80-180.
2. A process for producing a composite sisal core-spun multi-strand yarn according to claim 1, wherein: the method comprises the following steps:
the method comprises the following steps that firstly, sisal fiber strips fed into a spinning machine are properly carded and drafted, fibers are gathered through a yarn guide tube to form smooth fiber strips, the fiber strips enter a hollow spindle, and low-twist polyimide fiber filaments and viscose fiber filaments are twisted and coated to form sisal coated yarns A, B and C along with the rotation of the hollow spindle; twisting the carbon fiber filaments to form low-twist carbon fibers, wherein the twisting direction of the low-twist carbon fibers is opposite to that of the plied yarns to form core filaments D;
and step two, the three covering yarns A, B, C and the core filament D enter a yarn guide hole specified by the yarn inlet plate, are twisted by the rotation of a spindle to form a core-spun multi-strand yarn, and then are wound on a bobbin.
3. The process for producing composite sisal core-spun multi-strand yarn according to claim 2, wherein: the specific operation of the first step is as follows: the sisal hemp strip is led out from the strip barrel and is fed into a rear roller through a guide strip bell mouth, the sisal hemp strip is conveyed to a front roller through the rear roller, three yarn guide rods are pressed above the sisal hemp strip between the front roller and the rear roller, a front carding roller and a rear carding roller are arranged below the sisal hemp strip, carding needles are arranged on the surface of the carding rollers and are inclined towards the rear of the rotation direction of the carding rollers, fibers are prevented from being grabbed when the carding needles comb the fibers, and a brush cleaning roller is arranged below the carding rollers; the carded sisal hemp strips enter a front roller through a buncher, are output from the front roller, pass through a yarn guide tube and then are vertically sent into a hollow spindle; the hollow spindle rotates, the low-twist polyimide fiber filaments and the viscose fiber filaments which are arranged on the hollow spindle are twisted and wrapped on the surface of the sisal fiber strip along with the rotation of the spindle, and the sisal fiber strip wraps the filament fibers to form wrapping yarns A, B and C.
4. The process for producing composite sisal core-spun multi-strand yarn according to claim 3, wherein: the back roller is divided into an upper roller and a lower roller, the upper roller is a convex roller, and the lower roller is a concave roller.
5. The process for producing composite sisal core-spun multi-strand yarn according to claim 3, wherein: the front roller is divided into an upper roller and a lower roller, the upper roller is a convex roller, and the lower roller is a concave roller.
6. The process for producing composite sisal core-spun multi-strand yarn according to claim 3, wherein: the front carding roller and the rear carding roller have different speeds, the surface linear speed of the rear carding roller is 0.5-2 times of that of the rear roller, and the surface linear speed of the front carding roller is 2-5 times of that of the rear carding roller.
7. The process for producing composite sisal core-spun multi-strand yarn according to claim 3, wherein: the carding needle angle beta of the carding roller is 5-45 degrees.
8. The process for producing composite sisal core-spun multi-strand yarn according to claim 2, wherein: the specific operation of the second step is as follows: after the sisal hemp strips are coated with the filaments, coating yarns A, B and C are formed and enter a yarn inlet plate through a yarn guide roller; the sisal hemp spinning and twisting integrated machine is divided into A, B, C spinning systems which are completely the same, three wrapping yarn A yarns, three wrapping yarn B yarns and three wrapping yarn C yarns are respectively formed, the yarn A yarns, the yarn B yarns and the yarn C yarns respectively enter three holes A, B and C of a corresponding yarn feeding plate, and D core yarns are led out from a yarn drum and then enter a central hole D of the corresponding yarn feeding plate; the surface of the yarn feeding plate is provided with four holes A, B, C and D, wherein the three holes A, B and C are distributed in an equilateral triangle, and the other hole D is positioned in the center of the three holes; the yarn A, the yarn B, the yarn C and the yarn D enter a spindle top hole vertically below through a yarn inlet plate, the spindle rotates to twist the four yarns, the yarn D is at the center and is wrapped by the yarn A, the yarn B and the yarn C, the spindle is in motion fit with the bobbin, and the twisted yarn is wound on the bobbin to form the sisal core-spun multi-strand yarn.
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| CN112981571A (en) * | 2021-02-05 | 2021-06-18 | 扬州广泰化纤有限公司 | Preparation method of polyester staple fiber oil absorption material |
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