CN108286100B - Method for short-process yarn formation of down-like difficult-to-spin fibers - Google Patents

Abstract

The invention relates to a method for forming a yarn by a short process of down-like difficultly-spun fibers, belonging to the technical field of spinning. The invention utilizes the characteristic that down-like fiber is easy to be made into non-woven surface material, adopts a non-woven surface material roll made of down-like non-woven fiber raw material to be arranged on a splitting machine, the non-woven surface material is split into fiber strips to quickly make a strip-like down-like fiber prepolymer, and then adopts a flyer twisting and winding action of a flyer roving frame which cancels a drafting system to directly and continuously convert the strip-like prepolymer of the down-like fiber into linear cylindrical yarn. The method has short process flow and is easy to popularize and apply.

Description

Method for short-process yarn formation of down-like difficult-to-spin fibers

Technical Field

The invention relates to a method for forming a yarn by a short process of down-like difficultly-spun fibers, belonging to the technical field of spinning.

Background

Textile fabrics for garments can be divided into three main categories: woven (tatted), knitted and non-woven fabrics. The woven and knitted fabrics are made of yarns or filaments by a weaving process; nonwoven fabrics (also known as nonwovens) are made by bonding, fusing or other mechanical and chemical processes to textile fibers. The woven fabric is a fabric formed by interweaving warp yarns and weft yarns vertically, and the fabric weave comprises plain weave, twill weave, satin weave and weave formed by the three basic weaves and the intersection change of the three basic weaves. The knitted fabric is formed by forming loops by yarns or filaments and then mutually stringing and sleeving the loops, and most of the knitted fabric has good elasticity due to the structural characteristics of the loops and large yarn storage amount in unit length. Machine weaving and knitting all belong to traditional textile processing category, and traditional weaving adopts and spins earlier, weaves the process after, and specific machine weaving step is: loose fiber opening and impurity removal, mixing, carding, combing, primary drawing, secondary drawing, roving, spinning, spooling, warping, slashing, tying warp, weft preparation and weaving; the specific weft knitting steps are as follows: loose fiber opening and impurity removing, mixing, carding, combing, primary drawing, secondary drawing, roving, spinning, spooling, heat setting and weft knitting. In traditional textile processing, there are three major technical problems: firstly, the traditional ring spinning method has the advantages that the process steps, the process flow and the labor are more, the time consumption is more, the cost is high, and the high-efficiency, high-quality and short-process spinning is the basis for shortening the spinning process; secondly, weaving preparation and weaving process flows after the spinning and spinning process are longer, the running speed is high, the requirements on the quality of the yarn such as wear resistance, strength and hairiness are higher, the yarn hairiness is more likely to cause needle breakage of knitting yarns around crochet hooks or unclear weaving opening so that the weft insertion efficiency is reduced, the yarn wear resistance and the strength are low, the broken end frequency of weaving warps is high, the weaving efficiency is low, and the quality of final products is poor; thirdly, although the traditional ring spinning has high cohesive force of finished yarn and wide range of spun yarn, the spinning is restricted by factors such as fiber length, rigidity, fiber number and the like, especially the fiber length is too short (the length is less than 20 mm), the internal and external transfer cohesive force of the fiber is insufficient in the yarn forming process, the strength of finished yarn is low, the broken ends of the spun yarn are frequent, and continuous spinning cannot be carried out.

In order to solve the problem of long process of the traditional ring spinning process, various free-end high-speed spinning technologies are developed. The vortex spinning is a new spinning method which utilizes a fixed vortex spinning tube to replace a spinning cup, a spinning spindle and a steel wire ring which rotate at a high speed for spinning. Because the eddy current replaces the mechanical twisting and coagulation without rotating machine parts, the method has the advantages of high speed, high yield, short process flow, high yield and the like. However, the air-jet vortex spinning is a spinning method in which the free end yarn tail is pushed by vortex to rotate and twist at high speed in a ring shape to form yarn, and belongs to a free end non-holding spinning method, so that the holding force on fibers in the spinning process is insufficient, the degree of transfer inside and outside the fibers is low, the degree of cohesion of the fibers is poor, the spinning strength is low, and therefore fibers with poor cohesion, short length, high rigidity and bending fluffiness cannot be spun into yarn by vortex. The friction spinning is a spinning method with short process flow, simple equipment, low speed and high yield, and the mechanical and air combination is used for adsorbing the condensed fiber, and the fiber is adsorbed and simultaneously the fiber strands are twisted into yarn by the friction force of the rotary dust cage friction roller. However, the friction spinning yarn is a layer-twisted wrapping structure yarn, internal and external transfer is lacked among fibers in the yarn, cohesion force among the fibers is poor, and strength of the finished yarn is low. Therefore, when the bending rigidity of the fiber is large and the length is too short, the dust cage twisting can not effectively turn, wind and twist into yarn, the friction spinning yarn forming difficulty is large, and the yarn forming quality is low. The raw material used by rotor spinning is fiber thick sliver, is different from roving used in ring spinning, can be directly fed into a rotor spinning machine for rotor spinning without multiple times of fine drafting and carding, and the rotor spinning twisting and winding are separately carried out, so that the spinning speed is not influenced by yarn packages, and the rotor spinning rotating speed is extremely high, therefore, the rotor spinning has the advantages of high spinning speed, large packages, low cost, low requirement on raw materials and the like. However, the mechanism of rotor spinning is that the fiber is lapped at the free end of a sliver, which easily causes that the control force of the fiber lapped at the outer layer of a yarn body is small in the spinning process, so that the rotor spinning has poor fiber holding forming control capability and is not suitable for fiber spinning with poor cohesion, short length, large rigidity and bending fluffiness. In conclusion, compared with the traditional ring spinning technology, the spinning speed is greatly improved by end spinning respectively, and the process is shortened by canceling a roving process; however, the free-end spinning still can not avoid the traditional procedures of carding, combing, drawing and the like, the flow is still longer, and the free-end spinning principle determines that the resultant yarn cohesive force is insufficient, the resultant yarn strength is low, the cohesive force is poor, the length is short, the rigidity is large, and the difficult-to-spin fiber with bending and fluffiness can not be continuously, effectively and high-quality free-end spinning.

In order to solve the technical problems that the fiber length is too short (the length is less than 20 mm) in the traditional ring spinning and free-end spinning processes, the internal and external transfer cohesive force of the fiber is insufficient in the yarn forming process, the yarn forming strength is low, the yarn breakage is frequent, and the continuous spinning cannot be carried out, a filament and short fiber composite yarn method is usually adopted. Chinese patent publication No. CN101492843B, published 5/12/2010, entitled an embedded system positioning spinning method, which is characterized in that two filaments are fed into a front roller at a certain interval, two strands are respectively fed into the front roller at a certain interval in a bilateral symmetry manner, the filaments at one side and the staple fiber strands at the side are formed and pre-wrapped firstly, and then the filaments and the pre-wrapped composite yarn strands at the other side are subjected to converging and twisting to form composite yarns with more complex structures; the yarn forming area of the embedded spinning is a yarn forming area with large symmetrical acute triangle shape formed by the filaments, and the two strands are fed into the yarn forming area with the acute triangle shape formed by the filaments, so that the filaments can effectively and automatically contact and capture-type winding on the short fiber strands, the spinnable fiber type and yarn number range is expanded, and the non-spinnable fiber strands can be smoothly ring spun into yarns. The invention discloses a vortex composite spinning method for producing fancy yarn, which is invented and named in China patent publication No. CN103215700B, 2016, 01, 06, and actually discloses a clamping type vortex spinning method for carrier filament and short fiber, which can effectively capture the short fiber, so that the short fiber can be effectively spun into a yarn body, and the vortex spinning of the difficult-to-spin short fiber strands can be smoothly carried out. Although the problem that the difficult-to-spin fiber cannot be spun into yarn can be solved to a certain extent, the technology is not adopted in a large area, and the key point is that the technology still adopts fiber strips or roving as corresponding process raw materials, and the difficult-to-spin raw materials such as ultra-short fibers, high-rigidity brittle fibers, high-resilience ultra-fluffy fibers, powdery materials and the like are difficult to produce the fiber strips or the roving. Therefore, it is very difficult to directly prepare the raw materials difficult to spin such as ultrashort fibers, high-rigidity brittle fibers, high-resilience ultra-fluffy fibers, powdery materials and the like into the cylindrical holding type linear body which is longitudinally and orderly arranged, so that the continuous linear body of the raw materials difficult to spin such as the ultrashort fibers, the high-rigidity brittle fibers, the high-resilience ultra-fluffy fibers, the powdery materials and the like is produced in a short flow, is used for a spinning system for efficiently clamping and embedding the fibers, and is the key for solving the problem of smooth spinning of the raw materials difficult to spin.

The non-woven fabric does not need spinning and weaving processes, only the fibers or filaments are directionally or randomly arranged to form a fiber web structure, and then the fiber web structure is reinforced by adopting methods such as mechanical, thermal bonding or chemical and the like to form the non-woven fabric; compared with the traditional textile processing that the yarns are interwoven and knitted together to form the fabric, the non-woven fabric is usually finished by a one-step method (for example, polypropylene granules are used as raw materials, and polypropylene non-woven fabric is produced by a continuous one-step method of high-temperature melting, spinning, line laying and hot-pressing coiling), breaks through the traditional textile principle, and has the advantages of short process flow, high production rate, high yield, low cost, wide application, multiple raw material sources and the like. According to different non-weaving key technical methods, the method mainly comprises the following steps: spunlacing, needle punching, melt blowing, spunbonding, hot rolling, stitch bonding, composite processes, and the like. The spunlace method is to spray high-pressure micro water flow onto one or more layers of fiber webs to entangle the fibers with each other, so that the fiber webs are reinforced to have certain strength, and the spunlace method is divided into two process routes according to different quality requirements of processed products: A. fiber raw material → opening and mixing → carding → lapping → drafting → prewetting (water treatment circulation) → forward and reverse spunlace (water treatment circulation) → after finishing → drying → winding; B. fiber raw material → opening and mixing → carded and disordered web → prewetting (water treatment circulation) → positive and negative hydroentangling (water treatment circulation) → after finishing → drying → winding. The process A has good adjustment on the longitudinal and transverse strength ratio of the fiber web, and is suitable for producing spunlace synthetic leather base cloth; the process B is suitable for producing the spunlace materials. Needle punching is a type of dry nonwoven forming, which utilizes the piercing action of needles to consolidate a lofty web into a fabric. The melt-blown method is one of the non-woven processes of the polymer extrusion method, the process of the method is originally to utilize high-speed hot air to draw polymer melt trickle extruded from spinneret orifices, thereby forming superfine fibers, condensing the superfine fibers on a condensing net curtain or a roller, and forming non-woven fabrics by self-adhesion, and the specific process comprises the following steps: polymer feeding, melt extrusion, fiber formation, fiber cooling, web forming and cloth reinforcement. The spun-bonded method is also a melt spinning web-forming method, belongs to a one-step method for forming non-woven fabric, and utilizes a chemical fiber spinning method, and uses quenching air to cool extruded melt filaments in the process of forming polymer spinning, so that the filaments are acted by drawing air flow in the cooling process to form continuous filaments, then forms a web on a coagulation net curtain, and lays the web on the net curtain, and then forms the non-woven fabric by the spun-bonded method after being processed by a consolidation device. In order to realize the composite performance of multi-component and various non-woven fabrics, a composite non-woven technology is often adopted, such as: SM, SMS, SMSMS, CS, CSC, etc. (S stands for spunbond nonwoven, M stands for meltblown nonwoven, C stands for spunbond nonwoven). With the continuous development of the application technology of fiber materials in various fields, nanofiber materials become a hot topic for research and functional application. The diameter of the nano fiber is in the range of 1nm-100nm, the nano fiber has the performance advantages of high porosity, large specific surface area, large length-diameter ratio, high surface energy and activity and the like, embodies excellent functions of reinforcement, antibiosis, water repellency, filtration and the like, and is applied to various fields of separation filtration, biological medical treatment, energy materials, polymer reinforcement, photoelectric sensing and the like. With the expansion and the demand of the application field of the nano-fiber, the forming preparation technology of the nano-fiber is further developed and innovated; up to now, methods for producing nanofibers mainly include chemical methods, phase separation methods, self-assembly methods, spinning methods, and the like. The spinning processing method is considered as the most promising method for preparing the high polymer nano-fiber in a large scale, and mainly comprises an electrostatic spinning method, a two-component composite spinning method, a melt-blowing method, a laser drawing method and the like. The laser ultrasonic stretching method is characterized in that the fiber is heated by laser irradiation, and simultaneously is stretched under the ultrasonic condition to generate a stretching ratio of about 105 times, so that the nano-fiber filament is prepared, and the method belongs to a conventional filament post-processing method; in addition, other nano-spinning processes are also directed to spinnerets, all in common: the diameter of the fiber reaches the nanometer scale by adopting the spinning synergistic drafting effect. The invention discloses a multi-responsiveness controllable filtration electrostatic spinning nanofiber membrane and a preparation method thereof, which are disclosed by the intellectual property office 2016, 11/2016, and the patent application No. ZL201611005678.4, the application publication provides a method for forming a nanofiber membrane by placing a temperature-sensitive and PH-responsive polymer solution into an electrostatic spinning instrument and spraying and laying the solution by the electrostatic spinning instrument. The key problem of electrostatic spinning is that electrostatic spinning belongs to non-positive holding drawing spinning, a Taylor cone is formed in the spinning process of electrostatic jet, jet fibers are difficult to effectively draw at high power, the drawing is insufficient, so that the alignment orientation degree of macromolecules in the nanofibers is poor, the fineness of the nanofibers needs to be further refined, the strength is too low, and the size needs to be further refined; in addition, the spinning process of the Taylor cone-shaped state causes that the fibers obtained by electrostatic spinning can not be longitudinally laid in order, and the fibers are difficult to be linearly collected and gathered, so that the method is mainly used for producing nano-fiber membrane materials. The invention patent 'a coaxial centrifugal spinning device and method' disclosed in 2016, 08, 29 of the Chinese intellectual property office, and patent application No. ZL201610753443.7, discloses a centrifugal spinning method for realizing large-scale production of superfine fibers and even nano fibers by rotating a coaxial centrifugal tube at a high speed through arranging an inner layer needle and an outer layer needle on the coaxial centrifugal tube; the patent of invention patent 'titanium dioxide/polyvinylidene fluoride micro/nano fiber membrane and centrifugal spinning preparation method thereof', which is disclosed by the intellectual property office 2016, 12, month and 14, patent application No. ZL201611154055.3, provides a method for preparing a micro-nano fiber membrane by mixing self-made anatase type TiO2 and polyvinylidene fluoride (PVDF) to prepare centrifugal spinning solution and carrying out centrifugal spinning on a centrifugal spinning machine. The key problem of centrifugal spinning is that spinning is carried out through high-speed rotation and centrifugal action, the jetted jet flow filamentation is correspondingly laid into filaments in a ring type, and the fibers are difficult to longitudinally and orderly arrange, linearly collect and gather together, and are mainly used for producing nano fiber membrane materials; in the centrifugal spinning process, the method also belongs to non-positive holding and drawing spinning, the drawing force of centrifugal jet flow is limited by factors such as rotating speed, air resistance and the like, so that the spinning drafting is insufficient, the macromolecule arrangement orientation degree in the nanofiber is poor due to insufficient drafting, the fineness of the nanofiber is required to be further refined, the strength is too low, and the size is required to be further refined. However, the diameter of the nanofiber is too small, so that the absolute strength of the nanofiber is too low and the nanofiber is easy to wear, the nanofiber coated on the surface of a fabric is easy to wear and fall off, and the durability of the function of a coated textile product is poor, so that the nanofiber can be only slightly lapped and processed into a nanofiber membrane, and conventional drafting and twisting cannot be carried out to form yarns, and the industrial application of the nanofiber is severely restricted. If the nano-fiber is processed into macroscopic structure, products such as various functional medical and functional clothes, industrial fabrics and the like can be produced by adopting modern textile means, the performance and value of the traditional textile products can be broken through, and the application prospect is wide. Therefore, insufficient drafting in the nano spinning production causes poor alignment degree of macromolecules in the nano fibers, the fineness of the nano fibers to be further refined, too low strength and scale to be further refined, and poor adhesion and durability, the nano fibers coated on the surface of a fabric are easy to wear and fall off and cannot be processed by conventional spinning, so that the nano fibers can only be processed into non-woven fabrics or nano films in textile industrial production, high-speed short-flow textile processing cannot be carried out, and the textile industrial application of the nano fibers is severely restricted. Therefore, the non-woven web forming or film forming process has very short process flow, and is particularly easy to prepare the non-woven raw materials such as various ultra-short fibers, high-rigidity brittle fibers, high-resilience ultra-fluffy fibers, powdery materials and other non-woven raw materials into planar or sheet aggregates meeting the strength required by subsequent processing application, so that the products are endowed with higher strength, bulkiness, softness, air permeability and hydrophilicity. However, the nanofiber non-woven membrane and the conventional fineness fiber non-woven fabric have the following defects: 1) the strength and durability of the non-woven fabric are poor, the non-woven fabric cannot be compared with the traditional textile fabric, and the non-woven fabric cannot be used for replacing the traditional textile clothing product; 2) the fabric can not be cleaned like other fabrics and is difficult to be used for clothing fabrics; 3) the fibers are arranged in a certain direction and are easy to split from a right angle direction, and the like. Therefore, the method is characterized in that the planar or sheet aggregate of the non-woven membrane or the non-woven fabric is made of materials which are difficult to spin, such as ultra-weak materials (nano fibers and the like), ultra-short materials (short fibers), high-rigidity brittleness materials (carbon fibers, glass fibers, quartz fibers and the like), high-resilience ultra-fluffiness materials (down-like fibers), powder materials (fiber whiskers, carbon nano tubes, graphene, various nano microspheres and nano particles) and the like, and then the planar or sheet aggregate is quickly converted into the traditional textile, so that the strength and the durability of the textile are improved, meanwhile, the performances of fluffiness, air permeability, softness, antibiosis and the like of the non-woven membrane and the non-woven fabric are kept, and the method is a key for.

Aiming at the technical key, the Chinese patent publication No. CN202247124U, published as 2012, 05 and 30, invents a bidirectionally-coated non-woven fabric flat bar fancy yarn, which is a core yarn and two monofilament bidirectionally-coated core yarns, wherein the non-woven fabric flat bar is not twisted and cohered, only the outer layer is coated with filaments, is a fancy yarn essentially and has a structure different from that of the traditional twisted and cohered yarn; the invention provides a fluffy yarn made of non-woven fabric, which is a continuous flat pressing strip formed by longitudinally hot-pressing non-woven fabric, wherein the fibers of the pressing strip tend to be longitudinally arranged and are softened and bonded into a compact state by hot pressing, and fluffy fiber hairs which are not pressed are arranged on the two outer sides of the pressing strip. Obviously, although the yarns provided by the above two publications have a certain strong linear continuous characteristic, the yarn morphology structure is a flat strip state, lacks a fiber twisting cohesion type cylindrical structure, is different from the structure of a conventional textile yarn, is not suitable for yarn feeding and yarn guiding channels of conventional textile equipment, cannot be really integrated into conventional batch yarn weaving equipment and production processes, and does not solve the technical problem of how to spin and weave difficult-to-spin materials such as ultra-weak (nano fibers and the like), ultra-short (short fibers), high rigidity brittleness (carbon fibers, glass fibers, quartz fibers and the like), high resilience ultra-fluffiness (down fibers), powder (fiber whiskers, carbon nano tubes, graphene, various nano microspheres, nano particles) and the like, so that the ultra-short fibers are generally applied to the paper industry and the development of reinforcing fillers and flocking products of composite materials at present.

Disclosure of Invention

In order to solve the problem of difficult yarn formation of the down-like difficult-to-spin material, the invention aims to provide a method for short-process yarn formation of down-like difficult-to-spin fibers. In order to achieve the purpose, the technical solution of the invention is as follows:

a method for forming yarn by down-like difficultly-spun fiber in a short process comprises the following steps:

preparation of A-fiber tapes

A non-woven surface material roll with the surface density of 10-200 g/square meter, which is made of down-like difficult-to-spin fiber raw materials, is placed on a cutting machine provided with a can roll winding system, the non-woven surface material is cut into fiber strips with the line density of 40-600 g/kilometer, and each fiber strip is respectively wound in a can to form a wound can of the fiber strips;

twisting the B fiber strip with a flyer to form yarn

The package sliver can is respectively arranged below a guide frame of a flyer roving frame without a drafting system, at least 1 fiber strip led out from the package sliver can is fed into a front roller jaw formed by meshing a front roller of the flyer roving frame and a front rubber roller through a guide roller on the guide frame and is output from the front roller jaw, the output linear speed is 10-25 m/min, the output fiber strip is subjected to flyer twisting and winding traction, the flyer rotating speed is 500-1400 r/min and the spindle rotating speed is 600-1800 r/min during flyer twisting, the internal fiber of the twisting acting force three-dimensional twisting fiber strip is tightly embraced and the cohesion among fibers is increased, the traction acting force draws the internal fiber of the fiber strip to extend along the length direction of the strip and increases the fiber orientation, and finally the fiber strip is directly converted into a linear cylindrical sliver with the fineness of 42-640 tex, the sliver is wound on a bobbin inserted on the rotary spindle rod of the flyer mechanism sequentially through the top hole, the side hole, the hollow arm, the presser bar and the presser leaf of the rotary spindle of the flyer mechanism.

Due to the adoption of the technical scheme, compared with the prior art, the method for forming the yarn by the down-like difficultly-spun fiber in the short process has the advantages that: the invention puts the non-woven surface material roll made of down-like difficult-to-spin fiber raw materials on a cutting machine, cuts the non-woven surface material into fiber strips with 40-600 g/kilometer of linear density, skillfully utilizes the random interpenetration and bonding of down-like fibers to form the non-woven surface material with uniform intensity meeting the processing requirement, directly and accurately cuts the non-woven surface material of the down-like fibers into target fixed-weight fiber strips, conveniently prepares a strip-shaped prepolymer for the direct twisting of down-like fiber aggregates into yarns, omits a series of procedures of multiple drafting and drawing of pre-spinning and drawing of drawn strips, drafting and twisting of drawn strips into rough yarns and the like of the traditional spinning, not only greatly shortens the traditional spinning flow, but also breaks through the problems that the fibers are easy to be entangled with each other, the longitudinal orderly arranged difficulty, the uniformity of the fiber strips and the low strength of the fiber strips are poor when the down-like fibers are, The technical bottleneck that the spun yarn is extremely difficult to be formed by drafting and twisting; the invention adopts the flyer twisting and winding function of a flyer roving frame, closely embraces short fibers in a three-dimensional twisted fiber strip, increases cohesion among the fibers, simultaneously draws the fibers in the fiber strip to extend along the length direction of the strip, increases fiber orientation, directly and continuously converts the linear flaky fiber strip into linear cylindrical yarn with the fineness of 42-640 tex, changes the state that down-like fibers in the fiber strip are too loose and randomly distributed, solves the technical problems that the fiber cohesion degree in a twistless flat strip or flat yarn is small, the textile processing requirement is difficult to adapt, and the like, simultaneously omits the traditional spinning doubling, roving drafting, spun yarn drafting and twisting processes, and further shortens the yarn forming process. The invention adopts two steps of cutting the non-woven surface material into fiber strips and twisting the fiber strips into yarns by a flyer, not only solves the technical problem that down-like fibers are difficult to spin into yarns, but also realizes the short-process yarn formation of the down-like fibers, and provides a quick and effective method for preparing high-function high-quality yarns and garment materials from the down-like fibers. The method has the advantages of obvious yarn forming advantages, short flow and easy large-area popularization and application.

Drawings

FIG. 1 is a flow diagram of the yarn forming process of the present invention.

Detailed Description

The method for forming the yarn by the short process of the down-like difficultly-spun fiber is further described in detail by combining the attached drawings.

See the attached drawings.

A method for forming yarn of eiderdown-like difficult-to-spin fiber in short process, said method comprises making eiderdown-like difficult-to-spin fiber raw materials into non-woven web-forming process according to the existing, the web-forming process can adopt processes such as the water-jet method, needle punching method, hot-rolling bonding method, stitch-bonding method, etc., make the surface material package of the non-woven with 10-200 grams/square meter of areal density; then the method comprises the following steps:

preparation of A-fiber tapes

The method comprises the steps of rolling a non-woven surface material with the surface density of 10-200 g/square meter, which is made of down-like difficultly-spun fiber raw materials, on a cutting machine provided with a barrel rolling system, cutting the non-woven surface material into linear sheet-shaped fiber strips with the linear density of 40-600 g/kilometer, preparing for directly twisting down-like fiber aggregates into yarns, and removing a series of processes of multiple drafting and drawing in a pre-spinning process and drafting and twisting in a drawn sliver to make roving and the like in the traditional spinning process; each fiber strip is respectively placed in a can to form a package can of the fiber strips;

twisting the B fiber strip with a flyer to form yarn

Respectively placing the package sliver can below a guide frame of a flyer roving frame without a drafting system, feeding at least 1 fiber strip led out of the package sliver can into a front roller jaw formed by meshing a front roller of the flyer roving frame and a front rubber roller through a guide roller on the guide frame, outputting the fiber strip from the front roller jaw at the output linear speed of 10-25 m/min, subjecting the output fiber strip to flyer twisting and winding traction action, wherein the flyer rotating speed is 500-1400 rpm during flyer twisting, the bobbin rotating speed is 600-1800 rpm, twisting action force is used for three-dimensionally twisting the internal fibers of the fiber strip to tightly embrace and increase inter-fiber cohesion, traction action force is used for drawing the internal fibers of the fiber strip to extend along the length direction of the strip and increase fiber orientation, and finally directly converting the linear flaky fiber strip into a linear cylinder, The sliver with the fineness of 42-640 tex changes the state that down-like fibers in a fiber strip are too loose and randomly distributed, solves the technical problems that the fiber cohesion degree in a twistless flat strip or flat yarn is low, the requirements of textile processing are difficult to adapt and the like, simultaneously omits the traditional spinning drawing, roving drafting and spun yarn drafting twisting processes, further shortens the yarn forming process and improves the yarn forming efficiency. The formed sliver passes through the top hole, the side hole, the hollow arm, the presser bar and the presser blade of the rotary flyer of the flyer mechanism in sequence and is wound on a bobbin inserted on the rotary flyer bar of the flyer mechanism.

The following description will be used to further illustrate the specific application of the present invention in conjunction with the specific down-like non-spinnable fiber short-run yarn-forming process.

Example 1 short run yarn formation was carried out using duck's down.

Duck down is one of down feather, and belongs to animal protein fiber. The duvet has the advantages of high warmth retention, strong elasticity, high filling power, light weight, softness and softness. When tested with 50% down rate, the light filling power of the duck down is 2.8 times that of cotton and 2.2 times that of wool. The natural down quilt with the same volume has the lightest weight which is 1/3 of a cotton quilt and 1/2 of a wool quilt, so that the down quilt is not only soft and warm, but also has good skin touch feeling. However, the duck down is not in a single fiber structure, but is mostly in a down and down-like state, so that the duck down is difficult to be longitudinally and orderly arranged, and fiber strips are formed and twisted into yarns, so that the application of the duck down in the aspect of spinning is greatly limited. The duck down fiber is light, and fly and fiber falling are easily formed during textile processing. However, the duck down can be loosened, laid into a net and non-woven into a sheet-shaped section by a needle punching method, so that a non-woven surface material roll with the surface density of 200 g/square meter, which is made of the duck down raw material, is obtained; then the invention is adopted to carry out short-process yarn formation, and the specific steps are as follows:

preparation of A-fiber tapes

The method comprises the steps of rolling a non-woven surface material roll with the surface density of 200 g/square meter made of a duck down raw material, placing the non-woven surface material roll on a cutting machine provided with a strip cylinder ring loading system, cutting the non-woven surface material into linear sheet fiber strips with the linear density of 600 g/kilometer, preparing for directly twisting duck down aggregates into yarns, and removing a series of processes of multiple drafting and drawing of pre-spinning and drawing of cooked strips, drafting and twisting of cooked strips to make rough yarns and the like in the traditional spinning, so that the traditional spinning process is greatly shortened, and the technical bottlenecks of poor uniformity and low strength of duck down fiber strips, and extreme difficulty in drafting and twisting of the spun yarns when the duck down fibers are carded into webs in the traditional carding process are broken through; each fiber strip is respectively placed in a can to form a package can of the fiber strips;

twisting the B fiber strip with a flyer to form yarn

The method comprises the following steps of respectively placing a package can below a guide strip frame of a flyer roving frame without a drafting system, feeding 1 fiber strip led out of the package can into a front roller jaw formed by meshing a front roller of the flyer roving frame and a front rubber roller through a guide strip roller on the guide strip frame, outputting the fiber strip from the front roller jaw at an output linear speed of 25 m/min, subjecting the output fiber strip to flyer twisting and winding traction action, wherein the flyer rotating speed is 500 rpm during flyer twisting, the bobbin rotating speed is 600 rpm, twisting action force is used for three-dimensionally twisting duck down in the fiber strip to tightly embrace and increase the duck down inter-duck-down cohesion, the dragging action force is used for dragging the duck down in the fiber strip to extend along the length direction of the strip and increasing the duck down fiber orientation, and because the twist shrinkage rate of the fiber strip during twisting is greater than the extension rate, finally directly converting the linear flaky fiber strip into a linear cylindrical fiber strip, The sliver with the fineness of 640 tex changes the state that down-like fibers in a fiber strip are too loose and randomly distributed, solves the technical problems that the fiber cohesion degree in a twistless flat strip or flat yarn is small, the requirements of textile processing are difficult to adapt and the like, simultaneously omits the traditional spinning drawing, roving drafting and spun yarn drafting twisting processes, further shortens the yarn forming process and improves the yarn forming efficiency. The formed sliver passes through the top hole, the side hole, the hollow arm, the presser bar and the presser blade of the rotary flyer of the flyer mechanism in sequence and is wound on a bobbin inserted on the rotary flyer bar of the flyer mechanism.

Example 2 short run yarn formation was carried out using down cotton fibers.

The down feather cotton is produced by superfine fibers and down feather with different specifications through a special process, is called down feather cotton because the down feather cotton is similar to the down feather, and is also called silk floss or hollow cotton for most parts. The down cotton is divided into two types: one is formed by carding, and has hand feeling similar to that of DuPont cotton, also called as imitated goose down cotton; the second one is unformed, similar to PP cotton, has hand feeling close to down feather, and is an ideal substitute of the down feather. The appearance structure of the down feather cotton is similar to that of down feather, the down feather cotton belongs to high-fluffy fibers which are difficult to cohere, and the strips and the yarns are difficult to be formed by adopting the traditional textile process, so that the down feather cotton fibers are carded, lapped and formed into a fiber net by a needle punching method, and the fiber net is made into a sheet-shaped section by non-woven, thereby obtaining a non-woven surface material roll package with the surface density of 10 g/square meter made of the down feather cotton raw material; then the invention is adopted to carry out short-process yarn formation, and the specific steps are as follows:

preparation of A-fiber tapes

The method comprises the steps of rolling a non-woven surface material with the surface density of 10 g/square meter made of a down cotton raw material, placing the non-woven surface material on a cutting machine provided with a barrel rolling system, cutting the non-woven surface material into linear sheet-shaped fiber strips with the linear density of 40 g/kilometer, preparing for directly twisting down cotton fiber aggregates into yarns, and avoiding a series of processes of multiple drafting and drawing in a pre-spinning process, drafting and twisting to prepare rough yarns and the like in the traditional spinning process; each fiber strip is respectively placed in a can to form a package can of the fiber strips;

twisting the B fiber strip with a flyer to form yarn

The package can is respectively arranged below a guide strip frame of a flyer roving frame without a drafting system, 2 fiber strips led out from the package can are fed into a front roller jaw formed by meshing a front roller of the flyer roving frame and a front rubber roller through a guide strip roller on the guide strip frame and are output from the front roller jaw, the output linear speed is 10 m/min, the output fiber strips are subjected to flyer twisting and winding traction, the flyer twisting speed is 1400 rpm, the bobbin rotating speed is 1800 rpm, twisting acting force is used for three-dimensionally twisting down feather cotton fibers in the fiber strips to tightly embrace and increase the cohesion among the feather cotton fibers, the pulling acting force is used for pulling down feather cotton fibers in the fiber strips to extend along the length direction of the strips and increase the orientation of the feather cotton fibers, and because the shrinkage rate of the fiber strips during twisting is smaller than the extension rate, the linear flaky fiber strips are directly converted into linear cylinders, The formed sliver is wound on a high-speed revolving bobbin, the state that down feather cotton fibers in a fiber strip are too loose and randomly distributed is changed, the technical problems that the fiber cohesion degree in untwisted flat strips or flat yarns is small, the textile processing requirements are difficult to adapt and the like are solved, meanwhile, the traditional spinning drawing, roving drawing and spun yarn drawing twisting processes are omitted, the yarn forming process is further shortened, and the yarn forming efficiency is improved. The formed sliver passes through the top hole, the side hole, the hollow arm, the presser bar and the presser blade of the rotary flyer of the flyer mechanism in sequence and is wound on a bobbin inserted on the rotary flyer bar of the flyer mechanism.

Claims (1)

1. A method for forming yarn by down-like difficultly-spun fiber in a short process is characterized by comprising the following steps of:

preparation of A-fiber tapes

A down-like non-woven fabric roll with the surface density of 10-200 g/square meter, which is prepared from a down-like non-woven fiber raw material according to a non-woven net forming process, is placed on a cutting machine provided with a can winding system, the non-woven fabric is cut into fiber strips with the line density of 40-600 g/kilometer, and each fiber strip is respectively wound in a can to form a wound can of the fiber strips;

twisting the B fiber strip with a flyer to form yarn

The package sliver can is respectively arranged below a guide frame of a flyer roving frame without a drafting system, at least 1 fiber strip led out from the package sliver can is fed into a front roller jaw formed by meshing a front roller of the flyer roving frame and a front rubber roller through a guide roller on the guide frame and is output from the front roller jaw, the output linear speed is 10-25 m/min, the output fiber strip is subjected to flyer twisting and winding traction, the flyer rotating speed is 500-1400 r/min during flyer twisting, the bobbin rotating speed is 600-1800 r/min, the internal fiber of the twisting acting force three-dimensional twisting fiber strip is tightly embraced and the inter-fiber cohesion is increased, the traction acting force draws the internal fiber of the fiber strip to extend along the length direction of the strip and increases the fiber orientation, and finally the fiber strip is directly converted into a linear cylindrical sliver with the fineness of 42-640 tex, the sliver is wound on a bobbin inserted on the rotary spindle rod of the flyer mechanism sequentially through the top hole, the side hole, the hollow arm, the presser bar and the presser leaf of the rotary spindle of the flyer mechanism.

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