CN108728968B - Processing method, composite yarn and equipment of multi-color segment color linen and chemical fiber filament wrapped composite yarn - Google Patents

Abstract

The present invention provides a kind of Multicolor segments coloured silk flax, the processing method and composite yarn and equipment of chemical-fibres filaments enveloped composite yarn, with the long bast fibre spinning creamed linen yarn of wet process, two and the above colored filaments yarn yarn are simultaneously combined into heart yarn, utilize the distinctive heart yarn false twisting of hollow ingot wraping spinning-looping concretion technology feature, linen plucked is distributed in using the heart yarn twist, wave phenomenon under outer looping yarn tension fluctuation and heart yarn tension fluctuation collective effect, and false twist effect is generated in the grip hold arc that hollow ingot central tube lower end is formed using heart yarn, in conjunction with using parallel-moving type twizzle or tandem twizzle or notch type sleeve scroll tube active accommodation false twist effect, aggravate irregular variation and the Twist Unevenness of the heart yarn twist, heart yarn is set to generate irregular section of color effect, and using colourless, good long filament (the monofilament of transparency, or low radical multifilament) outside Fasciated yarn carries out looping consolidation, obtains flax composite yarn with Multicolor segments coloured silk feature.

Description

Processing method of multi-color segment color linen and chemical fiber filament wrapped composite yarn and composite yarn and equipment

technical field

The invention relates to the field of processing fancy and colored flax composite yarns, in particular to a processing method for multi-colored flax and chemical fiber filament wrapped composite yarns, composite yarns and equipment.

Background technique

Flax fiber is a kind of biomass fiber (natural cellulose fiber), and also a kind of rare natural fiber, its output only accounts for about 1.5% of the total amount of natural fibers. Flax fiber textiles have good coolness, crispness and cleanliness, and have good air permeability and moisture permeability, mildew resistance, insect resistance, anti-ultraviolet, anti-static and other excellent properties and functions, which are not available in other natural fibers. And it is irreplaceable, not to mention unmatched by chemical fibers.

However, the inherent defects of hemp fiber, such as high rigidity, poor elasticity, and poor dyeability, lead to poor textile processing performance and also affect the wearing performance of its fabric.

Flax spinning can be divided into pure flax spinning and flax blended spinning. The pure linen spinning process can be divided into long linen spinning and short linen spinning, in which the raw material used in long linen spinning is flax (process fiber, long fiber) obtained by primary processing (semi-degumming) of flax raw linen; the raw material used in short linen spinning is The short hemp produced during the primary processing of raw hemp (first rough, second thick) and the short hemp produced during the combing process of shaved hemp. Long hemp spinning and short hemp spinning can be divided into wet spinning and dry spinning. The characteristic of wet spinning is that on the spinning frame, the roving is soaked through the water tank before entering the drafting zone. After soaking the roving, the fiber colloid is softened, which is conducive to drafting, and due to the application of water, the yarn is smooth and has less hairiness. Because long hemp spinning uses technical fiber spinning (long hemp), the hairiness of the yarn is significantly less than that of short hemp spinning. However, due to the rigidity of the hemp fiber and poor cohesion, there are still many hairiness in the yarn, and the hairiness will be regenerated by the friction of the machine parts in the subsequent processing, that is, new hairiness will be generated. Yarn hairiness, especially long hairiness, can cause difficulties in weaving preparation and weaving. Linen yarn has a lot of hairiness, which will also increase the itching of the fabric when it is worn next to the skin (caused by the stiffness of the flax fiber).

When flax is blended with other fibers, slivers can be made separately, and then the slivers can be mixed for spinning; the flax fibers can also be cut into lengths corresponding to the blended fibers, scorched and bleached, and then the loose fibers can be blended. Yarn is spun on cotton, mid-length, silk or wool spinning equipment.

Blending flax with other fibers can improve the spinnability and weavability of flax fibers, and can also improve the properties of flax fabrics, such as elasticity and wrinkle resistance, on the basis of maintaining the style characteristics of flax fabrics.

At present, there are two types of pure linen yarns in the market: natural color yarn and bleached yarn, and they are basically spun by wet long linen spinning (this is because wet long linen yarn has less hairiness and smoother surface than short linen yarn) The difference between the two is that in the roving scouring process, the unbleached yarn is not bleached, and the finished yarn maintains the original light brown color of the flax (different origins, varieties, and batches of flax have certain differences in color).

Wet long hemp spun linen yarn has distinct characteristics of unevenness in thickness (the unevenness rate is more than 30%, and the diameter ratio of thick and fine details is more than 8 times), which endows its fabric with a unique rough style and is clearly recognizable.

Segment-colored yarn is a classic colored yarn, which is characterized in that in the length direction of the yarn, different yarn segments are of different colors, a yarn has two or more colors, and different color segments are arranged alternately, but the length is different. One (segments of non-equal length).

The traditional segmental colored yarn production technology is the segmental dyeing (color printing) of the yarn, so that the yarn presents fragments of different colors along its length. Due to the complexity of the technology and the difficulty in controlling the segmental color, it is now tending to be eliminated. The current segment color yarn mainly adopts the technology of color spinning (spinning after fiber dyeing). Through the transformation of drawing frame, spinning frame and other drafting devices, the feeding amount and drafting ratio of different colored yarns are controlled, so that the final The finished yarn presents the segment color effect, and the obtained segment color yarn can be a segment color slub yarn, or a segment color yarn of equal linear density. The specific techniques are as follows:

Segment colored sliver method: By installing feeding control device on the needle-comb draw frame or ordinary draw frame, feeding colored sliver of different colors intermittently to make segment colored sliver, and then forming segment by drawing and twisting Colored yarn is mainly used for spinning colored yarn with wool-type fiber segment, and the length of colored segment of the obtained yarn segment is long.

Colored roving method: Fibers of different colors are made into rovings, which are spun into segmented colored yarns on a ring spinning machine with modified drafting device. The rovings of different colors are fed into the drafting area at a certain distance, and the feeding positions can be the same or different (feeding from the back roller or middle roller). Control can be coupled (yarn weight constant) or non-coupling (yarn weight change, slub effect), the rovings of each color are collected by the concentrator after being drafted, and twisted after being output by the front roller nip Yarn with segmented effect. The latter technology is mainly used in production at present.

The appearance characteristics and technical core of segment colored yarn used in the industry lie in the randomness and irregularity of the distribution of different colored yarn segments in the length direction of the yarn, that is, the lengths of each colored yarn segment are different and irregular.

Hollow spindle wrap spinning is a technology that specializes in the production of composite structure yarns. Its technical feature is that one yarn (filament yarn or spun yarn) is helically wound to another yarn (filament yarn or spun yarn) to form a composite yarn with a wrapped structure (twisted twist).

The core of hollow spindle wrapping spinning technology is hollow spindle wrapping technology, which is also applied in parallel spinning technology (machine) and hollow spindle fancy twisting technology (machine), the former is used for spinning short fiber wrapping Yarn (the core yarn is the staple fiber after drafting), the latter is specially used for spinning fancy yarn (the core yarn is the short fiber strand after drafting or the long silk staple fiber composite structure sliver). At present, the special equipment for spinning wrapped yarn used in the industry is hollow spindle wrapping spinning machine, also known as mechanical covering machine (referred to as "machine bag" is a name relative to air network covering, air network covering become "empty bags" in the industry).

There are single-wrapping (one-time wrapping) and double-wrapping (two-wrapping) points for hollow spindle wrapping spinning.

Double-wrap spinning is to wrap one more time on the basis of single-wrapping, that is, to add a set of hollow ingot-aluminum ingot tube system to the equipment, which is driven by another motor to carry out the second wrapping. In order to obtain a stable yarn structure, the winding helix direction (twisting direction) of the secondary wrapping can be the same as that of the primary wrapping, or it can be opposite, that is, the so-called "X" direction wrapping is formed to realize three-component compounding, or obtain Better covering effect.

At present, the hollow spindle wrapping spinning method is mainly used for the production of elastic wrapping yarn (this is the original intention of wrapping yarn spinning equipment design, the core filament feeding part is designed for the elastic core filament feeding), that is, different yarns The high-density spandex elastic yarn is used as the core yarn, and polyester, nylon and other filaments or various staple fiber yarns are used as the outer wrapping yarn, and the elastic core yarn with a certain draft multiple is wrapped to make an elastic wrapping yarn. For the production of woven and knitted elastic fabrics.

Chinese patent CN201220494508.8 discloses a silk and linen wrapping yarn, which specifically develops a silk and linen wrapping yarn, which uses hemp fiber filaments as the inner core material, and wraps the hemp fiber filaments on the surface of the hemp fiber filaments by wrapping spinning technology. wrapped around silk fibers.

Chinese patent CN201220718329.8 discloses a flax blended composite wrapping yarn for knitting, which consists of a core yarn and two wrapping yarns. The twist direction is wound on the core yarn, the wrapping yarn is a dyeable filament, and the fineness ratio of the core yarn and the wrapping yarn is 3:1-4:1.

Chinese patent CN201310338357.6 discloses a non-itchy hemp core covered yarn and its processing method, specifically discloses a non-stinging hemp core covered yarn and its processing method, the covered yarn includes a core yarn and an outer wrapped yarn, Wherein, the core yarn is hemp yarn, the outer wrapping yarn is spun yarn or filament yarn, and the spun yarn or filament yarn is wound outside the hemp yarn and covers the hemp yarn ; The processing method includes: core yarn unwinding, yarn drawing, wrapping and winding forming four steps.

Chinese patent CN201621446891.4 discloses a covered yarn that reduces hairiness, the yarn core and the coating layer outside the yarn core, the yarn core is a staple fiber yarn core, and the coating layer includes a first filament and The second filament, the first filament and the second filament are twisted in opposite directions and wrapped in a helical shape outside the staple fiber yarn core.

Chinese patent CN201711398877.0 discloses a flax yarn, and discloses a flax yarn, which includes a yarn body, the yarn body includes a yarn core, and elastic yarn, flax fiber and a single core are respectively arranged inside the yarn core. The outer surface of the core is wound with a flax yarn layer, the outer surface of the flax yarn layer is wound with an elastic yarn layer, the outer surface of the elastic yarn layer is fixedly connected with a skin yarn, and the outer surface of the yarn body is spirally twisted with polyester fiber, viscose Fiber, Fiber Cotton and Flame Retardant Cotton Thread.

Chinese patent CN201510407962.3 discloses a linen-polyester twisted yarn and a linen-forged fabric prepared therefrom. The linen-polyester twisted yarn is obtained by twisting flax yarn and fine-denier polyester filament, wherein: the linen yarn The content of flax in the medium is 100%, the count of the flax yarn is 28-36Nm, and the twist TPI is 9-13.5; the fine-denier polyester yarn is 30D/12F semi-dull polyester low-stretch yarn; the linen polyester is twisted The twist TPI of the yarn is 7-13.

The above related technical patents adopt the processing methods of "wrapping (hollow ingot wrapping)" and "twisting (after being combined by a doubling machine, twisting by a two-for-one twister)" to perform compound processing on flax yarn to improve the quality of flax yarn. Yarn processability and fabric product performance purposes.

Contents of the invention

The present invention utilizes the segment color effect principle of combining and twisting multiple yarns of different colors, the specific false twist effect of the core yarn when the core yarn is wound by the hollow spindle wrapping yarn and its twist instability principle, and the twist is different in thickness. The principle of uneven distribution on the uniform yarn, and the principle of false twist disturbance of the core yarn twist, using hollow spindle wrapping spinning technology, specifically discloses a processing method for multi-color segmented linen and chemical fiber filament wrapping composite yarn and composite yarns.

The invention provides a processing method for wrapping composite yarns of multicolor flax and chemical fiber filaments, the steps of which are as follows:

1) Linen yarn and filament yarn of at least two colors are used as the core yarn, respectively unwound from the respective core yarn bobbins by means of negative feeding, and the linen yarn and filament yarn of at least two colors are combined to form Multi-core yarns, in which filament yarns of different colors are arranged at both ends of the linen yarn;

2) After the multi-core yarn passes through the spring-type tension device, it is fed into the hollow spindle, and meets the outer wrapping yarn wound outside the aluminum spindle tube that is set on the hollow spindle at the joint yarn guide hook. There is an included angle less than 90° between the route where the core yarn is fed into the hollow spindle after passing through the spring-type tension device and the central tube axis of the hollow spindle;

3) The aluminum ingot tube and the hollow ingot rotate at high speed together, driving the outer wrapping yarn to rotate at a high speed, and wrap the outer wrapping yarn on the multi-core yarn, and the multi-core yarn is located on the surface of the liner under the central tube to form a surrounding arc at a certain angle, while The lining tube under the central tube forms friction and false twist disturbance force on the multi-core yarn in the axial direction;

4) The outer wrapped yarn between the winding point of the outer wrapped yarn on the multi-core yarn and the unwinding point of the outer wrapped yarn from the aluminum spindle tube forms an air circle and generates tension;

5) Under the action of tension, the multi-core yarn is subjected to torsional torque at the winding point to produce a torsional twist, and the double-core yarn produces a segment color effect under the action of the false twist twist;

6) At the same time, under the action of the tension fluctuation of the outer wrapping yarn and the core yarn, the obvious uneven thickness of the flax yarn and the false twist disturbance force of the liner under the central tube at the bottom of the hollow spindle, the segment color effect is irregular ;

7) And under the wrapping wrapping yarn, the irregular segment color effect of the multi-core yarn is fixed, and the multi-color segment color linen and chemical fiber filament wrapped composite yarn with irregular segment color effect are obtained.

In step 2), a tandem yarn guide hook is installed between the spring type tension device and the hollow spindle, and the angle between the multi-core yarn passing through the tandem yarn guide hook and the axis of the central tube is less than 90 degrees.

In step 2), a sleeve-type false twister is sleeved on the lower end of the central tube of the hollow spindle, so that the path of the multi-core yarn fed from the spring-type tension device to the central tube has an included angle less than 90 degrees.

After combining two or more yarns of different colors, the yarns are twisted to make the yarns rotate around their own axes, so that the yarns that are originally arranged in parallel to each other are twisted/twisted together It becomes a cylindrical yarn body, and the cross-sections of the yarns are twisted relative to each other. Each yarn is in the shape of a helix, so that the relative position of each yarn changes, and the appearance of the yarn is divided into alternate arrays along its length. Color blocks.

The processing method also includes a yarn color adjustment method, and the yarn color adjustment method is as follows:

1. By adjusting the twist and irregularity of the core yarn, the segment color feature adjustment of the composite yarn can be realized;

2. By changing the color configuration of the filament yarn as the core yarn and the linear density of the linen yarn and the colored polyester yarn, the extension adjustment of the composite yarn is realized.

A composite yarn processed by the above-mentioned processing method of multi-color segmented color flax and chemical fiber filament wrapping composite yarn, which includes a multi-colored segmented yarn formed by combining and twisting flax yarn and multiple filament yarns of different colors. core yarn, and wrap the outer wrapping yarn on the outside of the multi-core yarn, the outer wrapping yarn is a colorless, transparent filament, and when the outer wrapping yarn is wrapped, the multi-core yarn produces an irregular segment color effect, and Wrapped and fixed by wrapping yarn.

A kind of equipment for the processing method of the above-mentioned multi-color section color flax and chemical fiber filament wrapped composite yarn, which includes several core yarn bobbins, each core yarn bobbin is equipped with a yarn guide hook correspondingly, and is located on each yarn guide hook A spring-type tension device is arranged at the intersection of the central ray, and a hollow ingot is arranged at the outlet of the spring-type tension device. An eccentric mechanism with an included angle of less than 90 degrees is formed between the tubes. The outer looper of the hollow ingot is set to wrap the aluminum ingot tube for wrapping the wrapping yarn, and the aluminum ingot tube is linked with the hollow ingot. The hollow ingot The upper end is provided with a converging yarn guide hook, and the upper end of the rendezvous yarn guide hook is provided with a yarn forming mechanism.

The eccentric mechanism is a serial yarn guide hook, which includes several yarn guide hooks arranged side by side.

The eccentric mechanism is a sleeve-type false twister, which can be set on the lower end of the central tube, and the diameter of the inner hole of the sleeve-type false-twister is the same as the inner hole of the lower liner at the lower end of the central tube. The diameters are consistent, and the lower end surface is an arc-shaped surface, and several grooves are set radially around the inner hole.

A yarn guide tube is arranged on the line section of the hollow spindle, and a translatable yarn guide hook is arranged between the two. By translating the yarn guide eyes of the translatable yarn guide hook, the movement route of the core yarn deviates from the centerline of the hollow spindle.

Beneficial effects of the present invention:

(1) Improve the wrinkle resistance of linen fabrics. Because the flax fiber is rigid and has poor elasticity, the fabric woven from flax yarn has poor wrinkle resistance and is very easy to wrinkle, which affects the appearance quality and wearing performance of the fabric. Through the compound processing of linen yarn and chemical fiber filament yarn (at least one of which is polyester yarn), the wrinkle resistance of the fabric can be improved while maintaining the style of the linen fabric.

(2) Reduce yarn hairiness, reduce hairiness regeneration, and improve weavability. Combining and wrapping can reduce hairiness of linen yarn and regeneration during weaving preparation, keep the surface of the fabric clean and reduce the itching of the fabric.

(3) Give the yarn and its fabric a multi-color appearance, and the fabric is free from dyeing. Through compound processing with colored chemical fiber filament yarn, the linen yarn and its fabric can be given a color appearance, and the fabric product does not need to be dyed or printed, but only necessary finishing processing, which can save water, electricity and dye consumption in printing and dyeing. Greatly reduce product pollution.

(4) Sizing-free weaving. By compounding with chemical fiber filament yarn, the strength and wear resistance of linen yarn can be improved, the yarn strength can be improved, and the unevenness of strength can be reduced, so as to realize the size-free weaving of linen yarn and save the size and auxiliary materials in the sizing process. agent consumption and water, electricity and steam consumption.

Description of drawings

Figure 1 is a schematic diagram of the segment color effect produced by combining three yarns of different colors and adding weak twist.

Figure 2 (1) (2) (3) (4) is a schematic diagram of the principle of false twist effect when the core yarn is wound by the outer wrapping yarn of the hollow spindle wrapping spinning.

Fig. 3 is a schematic diagram of the eccentric feeding of the core yarn at the lower end of the central tube of the hollow spindle.

Fig. 4 is a schematic diagram of the tandem yarn guide hook for adjusting the feeding position of the core yarn.

Fig. 5 is a schematic diagram of adjusting the feeding position of the core yarn by the translational yarn guide hook.

Figure 6 (1) is a schematic diagram of the structure of the sleeve type false twister.

Figure 6 (2) is a schematic diagram of the installation of the sleeve-type false twister at the lower end of the central tube of the hollow ingot.

Figure 7 is a schematic diagram of the three-core flax segment colored yarn spinning technology (tandem yarn guide hooks control core yarn false twist).

Figure 8 is a schematic diagram of the three-core flax segment colored yarn spinning technology (sleeve-type false twister controls the false twist of the core yarn).

Figure 9 is a schematic diagram of the four-core flax section colored yarn spinning technology (tandem yarn guide hooks control core yarn false twist).

Figure 10 is a blackboard diagram of flax core yarn.

FIG. 11 is a partially enlarged schematic view of FIG. 10 .

Fig. 12 is a blackboard diagram of flax-70D red and blue polyester segment color-wrapped yarns.

FIG. 13 is a partially enlarged schematic view of FIG. 12 .

Fig. 14 is a blackboard diagram of flax-150D red, blue and green polyester segment color-wrapped yarns.

FIG. 15 is a partially enlarged schematic view of FIG. 14 .

Detailed ways

Embodiments of the present invention will be further described below in conjunction with accompanying drawings:

The bleached linen yarn is spun by the wet method, and two or more colored filament yarns are combined to form a core yarn, and the core yarn false twist-wrapping and consolidation technology characteristics unique to the hollow spindle wrap spinning are used, and the twist of the core yarn is utilized. Distributed in the fluctuation phenomenon of the uneven thickness of the linen yarn, the tension fluctuation of the outer wrapping yarn and the tension fluctuation of the core yarn, and the false twist effect is generated by the surrounding arc formed by the core yarn at the lower end of the hollow spindle central tube, combined with the series yarn guide Hook or slotted sleeve type false twister actively adjusts the false twist effect, aggravates the irregular change and unevenness of the twist of the core yarn, so that the core yarn produces an irregular segmental color effect, and adopts colorless and good transparency Filament (monofilament, or multifilament with low number of filaments) is wrapped and consolidated with wrapping yarn to obtain flax composite yarn with multi-color segment color characteristics.

When two or more yarns (filament yarns or spun yarns) of different colors are combined together, if the yarns are twisted (to make the yarns rotate around their own axes), the yarns that were originally arranged in parallel The yarns are twisted (twisted) together to form a cylindrical yarn body, and the cross-sections of the yarns are twisted relative to each other, and each yarn is in the form of a helix. The torsional change of the relative position of each yarn caused by twisting makes the appearance of the yarn show a segmented color effect, that is, the torsion change of the relative position of each yarn divides the appearance of the yarn into alternate arrangements along its length direction. color blocks. When the twist degree of doubling yarn is small (weak twist), the length of the interphase color segment formed by the relative twisting of each yarn is long. Since the diameter of the yarn is small, in the vision of human eyes, the appearance of the yarn tends to appear as Segment color effect. Figure 1 shows the schematic diagram of the segment color effect produced after 3 yarns of different colors are combined and added with weak twist.

Figure 2 (1) shows the schematic diagram of the principle of hollow spindle wrapping into yarn. The outer wrapping yarn rotates with the hollow spindle, and the core yarn is helically wound to form the wrapping yarn (yarn). When the outer wrapping yarn wraps the core yarn, the outer wrapping yarn has a certain tension, and the tension is mainly generated from the yarn section between the unwinding point of the outer wrapping yarn on the aluminum spindle tube and the wrapping point of the core yarn (called air ring segment) and the air resistance, centrifugal force, and Coriolis force generated by the high-speed rotation of the hollow spindle (the yarn performs both circular rotation and axial movement, and there is a Coriolis inertial force, similar to the yarn guide of the ring spinning machine. Yarn in the balloon section between the hook and the traveler is stressed), etc. At the point where the wrapping yarn wraps around the core yarn, the tension T of the wrapping yarn acts in the direction shown in Figure 2 (2), which is the direction along the wrapping yarn away from the wrapping point. According to the theory of force analysis, the tension T of the wrapping yarn at the winding point can be decomposed into component forces T1 and T2 in two directions parallel to the core yarn and perpendicular to the core yarn. The effect of T1 is to make the winding spiral of the wrapping yarn Movement in the opposite direction of the core yarn movement direction, that is, downward winding; the component force T2 in the vertical direction acts on the core yarn tangentially along the circular cross-section of the core yarn, as shown in Figure 2 (3), and its effect on the one hand is Pulling the core yarn away from the axial position, on the one hand, generates a torsional moment (the product of the tangential force T2 and the core yarn radius r), which makes the core yarn rotate around its axial direction, that is, the core yarn twists and twists.

According to twisting theory, when the two ends of the sliver are held and twisted in the middle, it is false twist. False twist acts on both sides of the winding point, and will produce the same number of twists in opposite directions, as shown in Figure 2 (4). Above the winding point, the twist direction of the false twist is consistent with the winding direction of the outer wrapping yarn to the core yarn. In the situation shown in the figure, it is Z twist, and below the winding point, it is S twist. The twist produced by the false twist below the winding point causes the core yarn to twist, that is, at the winding point, when the outer wrapping yarn wraps the core yarn, the core yarn has been given a certain twist due to the false twist. According to the false twist theory, the twist on the core yarn will be offset by the reverse twist after passing through the winding point (false twist action point), but at this time the core yarn has been wrapped by the outer wrapping yarn, and the The added twist turns are thus consolidated, and the false twist twist turns above the wrapping point act on the wrapped yarn, the effect of which is to untwist the wrapping twist of the wrapped yarn, but not to counteract the reverse of the core yarn. Twisting (if there is no wrapping and consolidation of the outer wrapping yarn, the twisting of the core yarn generated below the winding point will be offset by the reverse twisting generated above the winding point after passing through the winding point, and finally there is no twist on the core yarn). The untwisting effect causes the yarn to not wrap the theoretical twist (the wrapping rotation direction is consistent with the false twist rotation direction, and a part of the wrapping rotation speed is offset by the false twist rotation rotation number). That is, due to the characteristics of wrap spinning, the false twist effect produced by the tension of the wrapping yarn on the core yarn will make the core yarn maintain a certain twist when it is wrapped, and it will be wrapped and fixed by the wrapping yarn, which cannot be offset .

How much the core yarn is twisted back depends on the size of the torsional moment generated by the tension of the outer wrapping yarn and the torsional stiffness of the core yarn (the ability of the yarn to resist torsional deformation, which is the shear elastic modulus of the fiber and the polar moment of inertia of the fiber interface product) size. Under the same other conditions, the greater the tension of the wrapping yarn, the greater the torsional moment, the more twists of the core yarn, and the more twists of the core yarn; back less.

The tension of the outer wrapping yarn mainly depends on the length and yarn density of the outer wrapping yarn section (balloon section) between the unwinding point and the wrapping point. The longer the wrapping yarn length of the balloon section, the higher the yarn linear density. Larger, the greater the gravity of the wrapping yarn in the balloon section, the greater the centrifugal force, air resistance, and Coriolis force of high-speed rotation, and the greater the tension of the wrapping yarn at the wrapping point.

The torsional stiffness of the core yarn mainly depends on the torsional stiffness of the yarn itself and the tension of the core yarn. For the same core yarn, the greater the tension, the stiffer the core yarn will be as a viscoelastic yarn material. , difficult to reverse. The torsional rigidity of the core yarn itself is related to many factors such as yarn material, linear density, twist, and yarn structure. And yarns with a tight yarn structure (such as compact spun yarns) have high torsional stiffness and are difficult to twist. Theoretically speaking, the larger the diameter of the core yarn, the greater the torsional moment of the wrapping yarn, but the larger the diameter of the core yarn, the greater its torsional rigidity, making torsional twisting difficult.

The twist of the core yarn below the winding point (the number of twists per unit length of the yarn) is related to the movement speed of the core yarn according to the stable twist theorem. Compare. Since the tension of the wrapping yarn at the winding point continues to act on the core yarn to produce torsional twists, the false twist speed of the core yarn is the number of twists that the false twist moment of the core yarn overcomes the torsional stiffness of the yarn to produce torsion. When the number of twists of the core yarn is constant, the added twist depends on the movement speed of the core yarn. The faster the movement speed of the core yarn, the smaller the twist of the core yarn below the winding point.

From the observation of the actual production process, the core yarn twist is relatively small. The reason is that, on the one hand, in the spinning process, in order to prevent the core yarn from being pulled and bent by the tension of the outer wrapping yarn, the winding effect cannot be carried out normally. Generally, a large tension is applied to the core yarn, causing the core yarn to exhibit Larger bending stiffness; on the other hand, since the tension of the outer wrapping yarn is mainly generated by the centrifugal force, air resistance, Coriolis force, etc. of the outer wrapping yarn of the aforementioned balloon section, the absolute value is not large, so the false twist The absolute value of the torque is small, and after the core yarn is twisted, the torsional rigidity will also increase with the increase of the twist angle (number of turns) of the core yarn, which also makes it more and more difficult for the core yarn to twist.

In view of the weak twist effect of the core yarn of the hollow spindle wrapping spinning, when multiple yarns of two or more colors are used to form the core yarn and fed together, the false twist effect of the tension of the outer wrapping yarn will cause the core yarn to produce segmental color. effect.

As mentioned earlier, the false twist effect produced by the tension of the wrap yarn depends on the tension of the wrap yarn at the wrapping point and the torsional stiffness of the yarn. If all factors related to the two are constant, the core yarn will maintain a stable twist, that is, an evenly distributed twist. However, in actual production, the following factors lead to the instability of the false twist of the core yarn, which makes the twist of the core yarn unstable and irregular. One, the instability of core yarn tension. Due to mechanical vibration, instability of unwinding tension of the core yarn and the stick-slip effect when the core yarn rubs against the yarn guide rod and other parts (the yarn is a viscous-elastic body), the tension of the core yarn fluctuates within a certain range. Rather than being constant, the magnitude of the tension is an important factor affecting the torsional stiffness of the core yarn, and the instability of the tension leads to the instability of the false twist of the core yarn. Second, the tension of the wrapping yarn is unstable. Since the unwinding point of the outer wrapping yarn on the aluminum ingot tube is not fixed, it depends on the position of the unwinding point (when unwinding a layer of yarn, the unwinding point is along the axial direction of the aluminum ingot tube between the two side disks). change from top to bottom, from bottom to top) and unwinding diameter (during the whole spinning process, the wrapped yarn on the aluminum spindle tube is unwound from the full tube to the empty tube, and the unwinding diameter of each unwinding layer of yarn The change of reducing the diameter of an outer wrapped yarn) is constantly changing, and the superposition of the two factors causes the length of the yarn section from the unwinding point to the winding point of the outer wrapped yarn to change constantly. The yarn gravity, which determines the tension, Air resistance, centrifugal force, Coriolis force, etc. also change with the length of the yarn segment, making the tension of the outer wrapping yarn fluctuate constantly. The complex fluctuation of the tension of the wrapping yarn leads to the fluctuation of the false twist torque and the instability of the twist of the core yarn. The instability of the core yarn tension and the instability of the wrapping yarn tension overlap, which makes the false twist of the core yarn show a certain degree of irregularity. The instability of the tension of the core yarn and the tension of the wrapping yarn determines the irregularity of the false twist effect of the core yarn.

This also determines that when two or more colors of multi-core yarns are used, the segment color effect produced has a certain degree of irregularity. The irregular segmental color effect of the core yarn can endow the composite yarn with segmental color appearance after being wrapped and fixed by the outer wrapping yarn.

However, when the core yarn density is high (the number of combined core yarns is large) or the torsional rigidity of a certain core yarn itself is high, the fluctuation of the tension of the core yarn and the tension of the wrapping yarn will cause the irregularity of the twist distribution of the core yarn. There will be a decline. At this time, active technical measures need to be taken to interfere with the distribution of core yarn twist.

As described in the principle of false twist effect when the core yarn is wound by the core yarn in the hollow spindle wrapping spinning, the torsional moment generated by the tension of the wrapping yarn at the winding point is the twist (or twist) produced by the core yarn under the tension of the wrapping yarn. Twist) is one of the determining factors. The torsional moment is equal to the product of the tension of the wrapping yarn and the radius of the core yarn. Assuming that the tension of the wrapping yarn remains constant, the larger the radius of the core yarn, the greater the torsional moment generated by the tension of the wrapping yarn at the winding point. The action point of the torsional moment is at the winding point of the outer wrapping yarn to the core yarn, but it will be transmitted along the direction of the core yarn to the feeding point, so that the core yarn below the winding point will be twisted and twisted, and the torsional moment will be transmitted downward. The twist is passed down from the winding point (to the core yarn feeding point). If the core yarn is equal in diameter and uniform in thickness, although the torsional moment increases due to the increase of the core yarn diameter, but the core yarn diameter increases, under the same conditions, the torsional stiffness of the core yarn will also increase (the yarn becomes thicker. , the ability to resist torsion increases), whether the twist added to the core yarn increases or decreases depends on which one is dominant, the increase in torsional moment or the increase in the torsional stiffness of the core yarn, if the former dominates, the twist of the core yarn will increase Increase, if the latter plays a leading role, the twist of the core yarn decreases.

However, if the core yarn itself is uneven in thickness, that is, some segments are thick and some segments are thin, different results will be produced.

According to the theory of twisting, when the yarn is twisted, if the yarn itself is uneven in thickness, the transmission of the torsional moment on the twisted yarn segment will cause the twist (twist) between the feeding point and the twisting point of the yarn The yarn length is unevenly distributed: the yarn is twisted at the twisting point, and the twisting moment is transmitted from the twisting point to the yarn feeding point. The yarn segment with a small diameter has a small torsional stiffness, and the twisting Many; the thicker yarn section has higher torsional rigidity and less twisting.

Therefore, if the core yarn is uneven in thickness, when the torsional moment generated by the tension of the wrapping yarn acts on the core yarn at the winding point, it will overcome the torsional rigidity of the core yarn to cause the core yarn to twist and feed the core yarn Direction (downward) transmission, the twist will be more distributed in the thin diameter segment, and the twist will be less in the thick diameter. The greater the thickness unevenness of the core yarn (the greater the difference between the large diameter and the small diameter), the more uneven the twist distribution of the core yarn, and the greater the twist unevenness.

For the core yarn with uneven thickness, when the thick places with large diameter pass through the winding point, the diameter of the yarn increases. Assuming that the tension of the outer wrapping yarn remains unchanged, the torsional moment generated by the tension of the outer wrapping yarn increases due to the increase of the acting torque. big. Although at the twisting point (winding point) the torsional stiffness of the core yarn increases due to the increase in diameter, the number of twists may not increase, but when the yarn is twisted, the torsional moment is transmitted, and the increased torsional moment is caused by the winding point When passing to the core yarn feed point, it will cause more turns of twist in the small diameter yarn segment with low torsional stiffness, plus more twists. That is, for the core yarn with uneven thickness, the increased torsion moment will add more twists to the core yarn, and the twist of the core yarn will increase, but because the twists are more distributed in the details of the small diameter of the core yarn , the twist unevenness further increases.

All in all, for the core yarn with uneven thickness, when the large-diameter slub passes through the winding point, the torsional moment of the core yarn generated by the tension of the outer wrapping yarn increases due to the increase of the acting moment (core yarn radius), and the outer wrapping yarn The tension increases the twist and turns of the core yarn at the winding point, and the twist of the core yarn increases. Although the twist at the large diameter thick point of the core yarn at the winding point does not necessarily increase due to the larger torsional rigidity, the twist is more Most of them are generated and distributed at the small diameter of the core yarn with low torsional stiffness, resulting in an increase in the unevenness of the twist distribution of the core yarn.

In the same way, when the small-diameter details smaller than the normal diameter pass through the winding point, the torsional moment generated by the tension of the outer wrapping yarn decreases due to the reduction of the acting moment. total reduction).

Therefore, if two yarns of different colors are used to form a double-core yarn, and at least one of them has significant unevenness in thickness, the core yarn will be weakly twisted due to the tension of the outer wrapping yarn to produce a segmented color effect, and will Due to the uneven thickness of the core yarn, the segment color effect of the core yarn is irregular (this is exactly what the segment color yarn requires). The greater the difference in thickness unevenness, the more irregular the distribution, the greater the uneven twist of the core yarn, and the more obvious the irregularity of the segment color. Wet long linen spun linen yarn is one of the yarns with the most obvious uneven thickness characteristics in common yarns. Using linen yarn as one of the core yarns can achieve the uneven twist effect of the core yarn.

As mentioned above, due to the tension of the outer wrapping yarn, the core yarn will maintain a certain twist when being wrapped by the outer wrapping yarn, and can be fixed in the yarn body through the winding of the outer wrapping yarn. The fluctuation of the tension of the core yarn and the wrapping yarn makes the twist of the core yarn show a certain degree of irregularity. Using this principle, the multi-core yarn composed of two or more colored yarns can produce irregular segmental color effects. The use of yarns with uneven thickness, such as wet long hemp spun linen yarn, as one of the core yarns, can also significantly destroy the regularity of the twist distribution of the core yarn and increase the unevenness of the twist distribution of the core yarn. However, in order to endow the core yarn with a multi-color effect, it is necessary to combine multiple yarns as the core yarn, and the combined effect will weaken the uneven thickness of the core yarn, and the combination of multiple core yarns will also weaken the tension fluctuation of the core yarn and the interference effect of the outer wrapping yarn tension fluctuation on the twist distribution uniformity of the core yarn. At this time, if the fluctuation of the twist of the core yarn is to be further aggravated, the segment color effect will show better randomness (the appearance characteristics and processing technical requirements of the segment color yarn lie in the distribution of different color yarn segments in the length direction of the yarn. Randomness and irregularity.), the method of interfering with the twist distribution of the core yarn can be adopted. To interfere with the distribution uniformity of core yarn twisting and twisting, the method of false twisting can be used.

During the bottom-up movement of the core yarn, if false twist is applied during the process, it will have no effect on the final twist of the core yarn. However, if the core yarn is composed of two or more yarns, because the yarn is a viscous elastic body, after false twisting, the false twist turns cannot be fully eliminated, but unevenness will remain on different segments. Evenly distributed false twist turns, that is, the twist turns on different segments are in opposite directions, and the number of Z-direction twists and S-direction twists is equal. These twists of different twist directions distributed on different segments of the core yarn will be superimposed with the twists of the core yarn produced by the tension of the outer wrapping, which will destroy the uniformity of the twist distribution of the core yarn and aggravate the irregularity of the twist of the core yarn. sex. The stronger the false twist effect, the greater the residual twist of the false twist on each segment of the core yarn, the greater the interference to the uniformity of the twist distribution of the core yarn, the more obvious the irregularity of the twist of the core yarn, and the greater the twist unevenness.

As shown in Fig. 7 and Fig. 8, the present invention provides a kind of processing method of multi-color segment color flax, chemical fiber filament wrapping composite yarn, and its steps are as follows:

1) Linen yarn and filament yarn of at least two colors are used as the core yarn, respectively unwound from the respective core yarn bobbins by means of negative feeding, and the linen yarn and filament yarn of at least two colors are combined to form Multi-core yarns, in which filament yarns of different colors are arranged at both ends of the linen yarn;

The three core yarns are respectively unwound from the core yarn bobbin under the guidance of the yarn guide hook 5 (the yarn guide hook 5 must be located directly above the center axis of the bobbin to ensure smooth unwinding of the yarn, and the yarn guide hook is closed and has no opening to prevent the yarn from breaking away from the yarn guide hook from the opening due to vibration, affecting the normal unwinding of the yarn), the 2-core bobbin of linen yarn is located in the middle, and the 1st and 3-core bobbins of colored filament yarn are located in the linen core yarn The purpose of doing this is to ensure that when the core yarn is subjected to false twisting, the two colored filament yarns are distributed on both sides of the linen yarn to ensure the segment color effect and avoid the early adhesion of the two filament yarns, which affects the segment color effect. .

2) After the multi-core yarn passes through the spring-type tension device, it is fed into the hollow spindle, and meets the outer wrapping yarn wound outside the aluminum spindle tube that is set on the hollow spindle at the joint yarn guide hook. There is an included angle less than 90° between the route where the core yarn is fed into the hollow spindle after passing through the spring-type tension device and the central tube axis of the hollow spindle;

Wherein it can be: the multi-core yarn enters the back porcelain eye of the spring type tension device 6, then passes between the two tension sheets, and passes through the front guide yarn porcelain eye. The spring exerts a certain pressure on the tension plate to ensure a certain feeding tension of the core yarn. The core yarn passes through the porcelain eye of the tandem yarn guide hook 7, and the core yarn enters under the central tube of the hollow spindle 8. The tandem yarn guide hook is not in On the axis of the central tube, it deviates from a certain distance, so that the core yarn and the central tube form a certain angle. The enveloping angle on the liner is also different, and the friction false twist effect is also different;

Perhaps the multi-core yarn enters the back porcelain eye of the spring type tension device 6, passes between the two tension sheets again, and passes through the porcelain eye of the leading yarn. The spring exerts a certain pressure on the tension sheet to ensure a certain feeding tension of the core yarn, and adjusts the feeding position of the core yarn through the sleeve type false twister 17 to realize the eccentricity between the feeding route of the core yarn and the central tube;

3) The aluminum ingot tube and the hollow ingot rotate at high speed together, driving the outer wrapping yarn to rotate at a high speed, and wrap the outer wrapping yarn on the multi-core yarn, and the multi-core yarn is located on the surface of the liner under the central tube to form a surrounding arc at a certain angle, while The lining tube under the central tube forms friction and false twist disturbance force on the multi-core yarn in the axial direction;

The core yarn passes through the central tube and is drawn from the upper end, and meets with the outer wrapping yarn at the meeting guide hook 11. The aluminum ingot tube is looped on the hollow ingot, and fixed on the hollow ingot with the lower holder and the ingot cap, so that it rotates together with the hollow ingot, and the lower end of the hollow ingot is frictionally driven by the ingot belt driven by the motor. The outer wrapping yarn is wound on the aluminum ingot tube 9, and the outer wrapping yarn is led out from the aluminum ingot tube, and meets the core yarn at the meeting guide hook, and the aluminum ingot tube and the hollow ingot rotate together at high speed, driving the outer wrapping yarn to rotate at a high speed, Wrap the wrapping yarn on the core yarn, and at the same time, the core yarn forms an encircling arc at a certain angle on the surface of the lower liner. When the lower liner rotates with the hollow spindle at high speed, it will form friction and false twist on the core yarn along the axial direction;

4) The outer wrapping yarn between the winding point of the outer wrapping yarn to the core yarn and the unwinding point of the outer wrapping yarn from the aluminum spindle tube, under the action of yarn gravity, centrifugal force of high-speed rotation, air resistance, Coriolis force, etc. Under the action of the force, the balloon 10 is formed and a certain tension is generated;

5) Due to the tension effect of the outer wrapping yarn, the core yarn is subjected to torsion torque at the winding point to produce a torsional twist, and the multi-core yarn produces a segment color effect under the action of the false twist twist, and due to the tension fluctuation of the outer wrapping yarn , Core yarn tension fluctuations, flax yarns’ obvious thickness unevenness, and core yarn twist disturbance caused by false twist disturbance of the central tube at the bottom of the hollow spindle, making the segment color effect appear irregular;

6) At the same time, under the action of the tension fluctuation of the outer wrapping yarn and the core yarn, the obvious uneven thickness of the flax yarn and the false twist disturbance force of the liner under the central tube at the bottom of the hollow spindle, the segment color effect is irregular ;

7) Under the wrapping of the outer wrapped yarn, the irregular segmental color effect of the multi-core yarn is fixed, and the multi-color segmental color linen and chemical fiber filament wrapped composite yarn with irregular segmental color effect are obtained.

The finished yarn is guided and output by the yarn guide roller 12, guided by the yarn guide rod 13, passing through the yarn guide ceramic eye on the traverse guide 14, and wound in a cross-winding manner under the guide of the traverse guide On the bobbin package 16 that is frictionally driven by the winding roller 15, it is wound into a bobbin.

For three colored filament yarns, the feeding method of the three colored filament yarns and the flax yarn is shown in Figure 9: two filament yarns 1 and 3 are arranged on both sides of the flax yarn 2, and the third filament yarn The yarn 4 is fed from the other row, unwound from the bobbin, passes through the closed yarn guide hook 5 above the bobbin, and then passes through the yarn guide hook 5 above the linen yarn bobbin, and is fed forward together with the flax yarn 2, Porcelain eye place merges with other two filament yarns behind spring type tension device 6. The purpose of this is to control the position configuration of the core yarns when they are combined. When the core yarns are twisted together by the false twist at the bottom of the central tube, the three filament yarns are distributed as evenly as possible around the linen yarn to avoid the three filament yarns being twisted together. The yarns stick to each other, affecting the segment color effect of the final yarn. The multi-core yarn enters the back porcelain eye of the spring type tension device 6, then passes between the two tension sheets, and passes through the front guide yarn porcelain eye. The spring exerts a certain pressure on the tension plate to ensure a certain feeding tension of the core yarn. The core yarn passes through the porcelain eye of the tandem yarn guide hook 7, and the core yarn enters under the central tube of the hollow spindle 8. The tandem yarn guide hook is not in On the axis of the central tube, it deviates from a certain distance, so that the core yarn and the central tube form a certain angle. The enveloping angle on the liner is also different, and the frictional false twist effect is also different; the aluminum ingot tube and the hollow ingot rotate at high speed together, driving the outer wrapping yarn to rotate at a high speed, and the outer wrapping yarn is wound on the multi-core yarn, and the multi-core yarn The surface of the liner located under the central tube forms a surrounding arc at a certain angle, and the liner under the central tube forms friction and false twist disturbance force on the multi-core yarn in the axial direction; Yarn guide hook 11 meets with the outer wrapping yarn. The aluminum ingot tube is looped on the hollow ingot, and fixed on the hollow ingot with the lower holder and the ingot cap, so that it rotates together with the hollow ingot, and the lower end of the hollow ingot is frictionally driven by the ingot belt driven by the motor. The outer wrapping yarn is wound on the aluminum ingot tube 9, and the outer wrapping yarn is led out from the aluminum ingot tube, and meets the core yarn at the meeting guide hook, and the aluminum ingot tube and the hollow ingot rotate together at high speed, driving the outer wrapping yarn to rotate at a high speed, Wrap the wrapping yarn onto the core yarn, and at the same time, the core yarn forms an encircling arc at a certain angle on the surface of the lower liner. When the lower liner rotates with the hollow spindle at high speed, it will form friction and false twist on the core yarn along the axial direction; The wrapping yarn between the winding point of the core yarn and the unwinding point of the wrapping yarn from the aluminum spindle tube is under the action of yarn gravity, centrifugal force of high-speed rotation, air resistance, Coriolis force, etc. , forming an air circle 10 and generating a certain tension;

Due to the tension effect of the outer wrapping yarn, the core yarn is subjected to torsion torque at the winding point to produce torsional twists. Yarn tension fluctuations, flax yarn’s obvious thickness unevenness, and the core yarn’s uneven core yarn twist caused by the false twist disturbance of the central tube at the bottom of the hollow spindle make the segment color effect appear irregular; Under the action of tension fluctuation of the core yarn, the obvious uneven thickness of the flax yarn and the false twist disturbance force of the liner under the central tube at the bottom of the hollow spindle, the segment color effect is irregular; and the wrapping of the outer wrapping yarn Next, fix the irregular segment color effect of the multi-core yarn, and obtain the multi-color segment color flax and chemical fiber filament wrapped composite yarn with the irregular segment color effect. Guided by the traversing yarn guide 14, it passes through the yarn guide porcelain eye on the traversing yarn guide 14, and under the guidance of the traversing yarn guide, it is wound in a cross-winding manner on the bobbin package 16 frictionally driven by the winding roller 15 , wound into a yarn bobbin.

The tension of the core yarn is to ensure the normal winding of the core yarn by the outer wrapping yarn as the primary guarantee. If the tension of the core yarn is small, under the tension of the wrapping yarn, the core yarn will be pulled away from the normal running route by the wrapping yarn. At this time, the winding cannot be carried out normally, and the core yarn and the wrapping yarn will twist instead of winding. Therefore, when starting spinning, the tension device will be adjusted so that the operation of the core yarn between the hollow spindle 8 and the meeting guide hook 11 is straight upward. When adjusting, the spinning tension adjusted by the spring tension device 6 is greater than or equal to the spinning tension when the running direction of the multi-core yarn between the hollow spindle and the meeting guide hook is straight upward.

On the hollow spindle wrapping spinning machine, the speed of the hollow spindle is constant and generally does not need to be adjusted. The wrapping twist of the core yarn by the wrapping yarn is realized by adjusting the yarn drawing speed. The yarn drawing speed determines the twist of the core yarn. The faster the yarn drawing speed, the smaller the core yarn twist, the longer the color segment, and the smaller the number of color segments per unit length of yarn. The size of the wrapping twist also determines the main parameters of the mechanical properties of the composite yarn, and the yarn drawing speed also directly determines the spinning output. When determining the wrapping twist (yarn drawing speed), since the mechanical properties of the composite yarn basically have no problem in meeting the requirements of subsequent processing, the requirements for the segmental color effect of the appearance of the composite yarn should be considered first.

The core yarn is selected as a wet-process long hemp spun bleached linen yarn (obviously uneven in thickness) and two or more colored chemical fiber filament yarns (required to be multifilament, at least one of which is polyester colored filament yarn), and the wrapping yarn Choose colorless and transparent filament (monofilament, or low-number multifilament), the linear density is relatively small, but it must meet the tension requirements during processing. Its main function is to fix the color effect of the core yarn segment by wrapping , has a certain influence on the mechanical and physical properties of the yarn. Linen yarn and colored filament yarn have different densities, and composite yarns have different appearance and performance characteristics, which can be reasonably selected according to the use of composite yarns.

When the tandem yarn guide hook 7 is used to control the movement route of the core yarn, to realize frictional false twisting at the bottom of the hollow spindle center tube 18, and to increase the unevenness of twist distribution of the core yarn, there are multiple yarn guide porcelain eyes on the tandem yarn guide hook , select different yarn guide porcelain eyes, the running route of the core yarn changes, which affects the wrapping angle of the core yarn at the bottom of the central tube 19 arc surface, and then affects the false twist effect there. The false twist residue produced by the false twist effect interferes with the twist of the final core yarn, thus affecting the irregularity of the twist change of the core yarn. If the upper porcelain eye is selected, the core yarn surrounds the lower liner with a large arc, the core yarn has a strong false twist effect, the final twist distribution of the core yarn is greatly disturbed, and the twist unevenness is also large. On the contrary, if the upper ceramic eyelet is selected, the arc of the core yarn at the lower liner will be small, the false twisting effect of the core yarn will be weak, the disturbance of the final twist distribution of the core yarn will be small, and the twist unevenness will be small. By comparing the color effect of the yarn section when selecting different yarn guide eyelets, it is possible to determine which yarn guide eyelet the core yarn passes through. Once determined, no adjustment will be made during the spinning process.

When using grooved sleeve type false twister to control the movement route of the core yarn, to realize the frictional false twist at the bottom of the hollow spindle center tube, and to increase the unevenness of the twist distribution of the core yarn, there are sleeve type false twisters with different number of grooves Choose false twisters with different numbers of grooves, which will affect the friction coefficient between the core yarn and the arc surface of the false twister, and then affect the false twist effect at this place. The false twist residue produced by the false twist effect interferes with the twist of the final core yarn, thus affecting the irregularity of the twist change of the core yarn. Choose a false twister with a large number of grooves, the friction coefficient between the core yarn and the false twister arc surface is large, the false twisting effect of the core yarn is strong, the disturbance of the final twist distribution of the core yarn is large, and the twist unevenness is also large. On the contrary, choose a false twister with fewer grooves, the friction coefficient between the core yarn and the false twister arc surface is small, the false twist effect of the core yarn is weak, the disturbance of the final twist distribution of the core yarn is small, and the twist unevenness is also small. The specifications of the sleeve type false twister can be determined by comparing the color effect of the yarn segment when choosing false twisters with different numbers of grooves. Once determined, no adjustment will be made during the spinning process.

The present invention also provides a composite yarn processed by the above-mentioned processing method of multi-color segmented flax and chemical fiber filament wrapped composite yarn, which comprises flax yarn and multiple filament yarns of different colors combined and twisted. A multi-core yarn with a segmented color effect, and the outer wrapping yarn is wrapped on the outside of the multi-core yarn. The outer wrapping yarn is a colorless and transparent filament, and the multi-core yarn is irregular when wrapped by the outer wrapping yarn The segment color effect is wrapped and fixed by the outer wrapping yarn.

Among them, the linen yarn can use the wet-process long-linen bleached linen yarn with obvious uneven thickness, and two or more colored filament yarns to form a multi-core yarn, so as to have a colorless and transparent filament (monofilament, or Low number of multifilaments) is wrapped once for the outer wrapping yarn, and the linen composite yarn with multi-color segment color effect is spun. Due to the unstable twist distribution of the core yarn, when the double core yarn is wrapped by the outer wrapping yarn, it has Segment color effect, and the segment color effect has irregularity and randomness. Colorless, transparent (monofilament, or low-count multifilament) filament wrapping yarn is wrapped on the core yarn, forming a segment color effect of "white + color 1 + color 2 +...", thus A flax/filament composite yarn with irregular segment color characteristics was obtained. The colorless and transparent filament wrapping yarn can fix the color effect of the core yarn segment, and will not have a significant impact on the segment color effect of the core yarn, but will have a certain impact on the yarn-forming performance.

The adjustment of the segment color characteristics of the composite yarn can be realized by adjusting the twist and irregularity of the core yarn. During the spinning process, it is realized by adjusting the movement speed of the core yarn (that is, the yarn drawing speed). As the yarn drawing speed increases, the false twist of the core yarn decreases, the length of the color segment increases, and the number of color segments per unit length of yarn decreases. The irregularity of the twist of the core yarn is guaranteed by the uneven thickness of the flax yarn, the disturbance of the false twist at the bottom of the hollow spindle center tube, the tension of the wrapping yarn and the fluctuation of the tension of the core yarn. The uniform effect decreases, and the main effect is the uneven twist distribution of the core yarn caused by the uneven thickness of the linen yarn and the false twist disturbance at the bottom of the central tube.

The color of the composite yarn can be adjusted by changing the color configuration of the filament core yarn and the linear density of the linen yarn and colored polyester yarn. The density of the linen yarn increases, and the white ratio of the finished yarn increases; the color and linear density of the colored filament yarn change, The yarn color and color ratio can be changed.

The invention also discloses a device for processing the above-mentioned multi-color section color flax and chemical fiber filament wrapped composite yarn, which includes several core yarn bobbins, and the upper ends of each core yarn bobbins are correspondingly provided with yarn guide hooks, and A spring-type tension device is arranged at the intersection of the central rays of each yarn guide hook, and a hollow ingot is arranged at the outlet of the spring-type tension device, and a path for feeding the core yarn into the hollow ingot is provided between the spring-type tension device and the hollow ingot An eccentric mechanism with an included angle of less than 90 degrees is formed between the central tube of the hollow ingot, and the outer looper of the hollow ingot is provided with an aluminum ingot tube for wrapping the outer wrapping yarn, and the aluminum ingot tube and the hollow ingot are linked and matched, The upper end of the hollow spindle is provided with a converging yarn guide hook, and the upper end of the converging yarn guide hook is provided with a yarn forming mechanism.

Under normal circumstances, the core yarn enters the central tube from the lower end of the central tube along the direction of the centerline of the hollow spindle. If the feeding direction of the core yarn is changed so that the core yarn enters the center tube at a certain angle α with the center line of the hollow spindle, as shown in Figure 3, the core yarn will be placed under the lining tube at the lower end of the center tube of the hollow spindle (wear-resistant ceramic material ) forms a certain encircling arc on the arc surface, when the hollow ingot rotates at high speed, the arc surface of the lower liner will rub against it along the axial direction of the core yarn, making it rotate around its own axis, resulting in a false twist effect. The effect of false twisting (the number of twists that make the core yarn rotate, and the number of remaining twists after the core yarn passes through the friction point) depends on the torsional stiffness of the core yarn, the speed of the hollow spindle, the running speed of the core yarn, and the relationship between the core yarn and the surface of the lower liner. The coefficient of friction and the angle of the surrounding arc of the core yarn on the arc surface of the lower liner. When the spindle speed remains unchanged, the running speed of the core yarn remains unchanged, and the torsional rigidity of the core yarn cannot be adjusted, the friction coefficient between the core yarn and the arc surface of the lower liner or the wrapping angle of the core yarn on the arc surface of the lower liner can be adjusted. Change the false twist effect, thereby changing the disturbing effect of false twist on the core yarn.

There are two specific implementation methods designed by the present invention: one is to use an adjustable feeding guide hook to produce an adjustable false twist effect by adjusting the wrapping angle of the core yarn at the bottom of the hollow spindle central tube; the other is to use a replaceable Slotted sleeve twister, by replacing the sleeve type twister with different numbers of grooves on the top, the friction coefficient of the core yarn at the lower end of the center tube can be changed to produce an adjustable false twist effect.

The eccentric mechanism is a serial yarn guide hook, which includes several yarn guide hooks arranged side by side.

That is, the lower spindle wrapping (on the hollow spindle wrapping spinning machine for production, there are generally two rows of spindles on the upper and lower sides. According to the needs, the two rows of hollow spindles on the upper and lower sides can be arranged in alignment for two times of wrapping, or they can be arranged in a misplaced position. Carry out a wrapping. When dislocation is arranged, there is no spindle position for the hollow spindle, but a non-rotating metal tube—the yarn guide tube), and the upper and lower serial yarn guide hooks are installed. As shown in Figure 4, after the core yarn passes through the tension device, it passes through the ceramic eye 23 of the yarn guide hook, and enters the central tube from below the central tube of the hollow spindle. The guide hook is not on the axis of the central tube (the axis of the guide hook deviates from the axis of the central tube by a certain distance), so that the core yarn and the central tube form a certain angle α, and the core yarn forms an angle of 90-α on the surface of the lower liner. Surrounding the arc, when the lower liner rotates with the hollow spindle at high speed, it will form friction and false twist on the core yarn along the axial direction. In order to make the false twist effect adjustable, the yarn guide hook that guides the core yarn into the hollow spindle center tube adopts the method of connecting multiple yarn guide ceramic eyes in series. The core yarn passes through different yarn guide ceramic eyes of the yarn guide hook, and the yarn guide route occurs. Changes, the wrapping angle of the core yarn on the lower liner is also different, and the effect of frictional false twisting is also different.

The eccentric mechanism is a sleeve-type false twister, which can be set on the lower end of the central tube, and the diameter of the inner hole of the sleeve-type false-twister is the same as the inner hole of the lower liner at the lower end of the central tube. The diameters are consistent, and the lower end surface is an arc-shaped surface, and several grooves are set radially around the inner hole.

The sleeve-type false twister at the lower end of the center tube of the hollow ingot is generally used for wrapping the lower ingot. The core yarn is also fed at a certain angle α to the center line of the hollow spindle (see Figure 8 for details), and the circumferential friction of the core yarn through the false twister of the lower liner produces a false twist effect. The structure and installation of the sleeve-type false twister are shown in Figure 6 (1) and (2), and the material is wear-resistant plastic. Its structure and function are similar to the cap type false twister of wing roving frame. The diameter of the inner hole is 8mm, which is consistent with the outer diameter of the lower end of the central tube of the hollow ingot, and can be set on the lower end of the central tube. The contact surface) is radially grooved along the center hole to the surrounding, the number of grooves is 4, 8, and 12 (the number of grooves shown in the figure is 8), and the groove depth is 0.5mm. After being fitted to the lower end of the central tube, the core yarn enters the center hole of the hollow spindle along its curved surface, and the sleeve-type false twister rotates with the hollow spindle, and the curved surface performs circumferential friction and false twist on the core yarn. The grooves on the surface of the curved surface increase the coefficient of friction with the core yarn, and the more the number of grooves, the greater the coefficient of friction and the more significant the false twist effect. In this method, the effect of false twisting is adjusted by replacing sleeve-type false twisters with different numbers of grooves.

The line section of the hollow spindle is provided with a yarn guide tube 21, and a translatable yarn guide hook 20 is arranged between the two. By translating the yarn guide eyes of the translatable yarn guide hook, the movement route of the core yarn deviates from the center line of the hollow spindle

This method belongs to the upper spindle wrapping and translational yarn guide hook. Also adopt the method of adjusting the radian surrounding the core yarn and the lower liner to adjust the false twist effect. As shown in Figure 5, on the hollow spindle wrapping spinning machine, when the upper spindle is used for wrapping, the corresponding spindle position of the lower dragon rib 22 is the yarn guide tube. A yarn guide hook is installed between the upper end of the yarn guide tube and the lower end of the hollow spindle, and the yarn guide eye of the yarn guide hook can be translated in a plane parallel to the vehicle surface, thereby changing the degree of movement of the core yarn from the center line of the hollow spindle. The wrapping angle of the core yarn on the lower bushing of the hollow spindle is changed, thereby changing the circumferential friction false twist effect at the lower bushing.

In the above three schemes, there is a parameter that is also very important, the length of the core yarn between the lower end of the hollow spindle and the porcelain eye of the yarn feeding guide hook. This section of yarn obtains a stable twist due to the frictional false twist at the bottom of the central tube (stable false twist section). Since the false twist of the core yarn at the bottom of the hollow spindle is achieved through friction, it is a negative twisting method, which is different from positively holding the yarn torsion twisting. When the torsional moment of the core yarn is greater than the twisting moment generated by friction, The core yarn slips at the friction surface and no more twist can be added to the core yarn. The torsional stiffness of the core yarn increases as the twist increases or decreases. If the length of the yarn segment is too short, the number of twists that can be accommodated is small, and when the core yarn enters the hollow tube through the false twist point, the number of residual twists will be very small, and the twist produced by twisting the core yarn at the wrapping point The distribution interference effect will also be reduced. Combined with the overall consideration of the structural size of the core yarn feeding part of the equipment, the length of the core yarn in the stable false twist section is generally controlled at 10-15cm to obtain an ideal effect of disturbing the uniformity of twist distribution of the core yarn. If it is too large, the effect will not be much different .

Example 1: Three-core yarn linen segment colored yarn

The flax core yarn used is 36Nm wet process long flax spinning flax bleached yarn, and its yarn blackboard is shown in Figures 10 and 11. It can be seen from the figure that the yarn has significant unevenness in thickness (the measured evenness is 35.65%, the -50% detail reaches 3791.7 pieces/km, and the 400% thick place reaches 140 pieces/km), and the yarn hairiness is relatively large. Many (measured hairiness value H up to 2.45mm/cm).

The specification of the polyester core yarn used is 70D/24F, and the variety is DTY. Red and blue colored polyester filament yarns and linen yarns are used to form a three-core yarn for wrapping processing.

The wrapping yarn is polyester monofilament with a diameter of 0.08mm and a linear density of 69dtex.

The main process is: the hollow spindle speed is 15435r/min, the yarn drawing speed is 28m/min, the wrapping twist is 551 twists/m, and the wrapping twist is S twist.

The technology of false twist interfering with the twist distribution of the core yarn adopts the method of series guide hooks, the axis of the guide hook deviates from the axis of the center tube by 12cm, and the angle between the core yarn and the center line of the center tube is 33°.

The appearance effect of the spun composite yarn is shown in Figures 12 and 13. It can be seen from the figure that the composite yarn presents an irregular segmented appearance of white (linen yarn) and red and blue (polyester filament yarn) arranged alternately; low linear density polyester monofilament (translucent) wrapped yarn Entanglement has little effect on the color of the core yarn color segment (no significant color mixing effect); due to the merging and wrapping effects, the evenness and hairiness of the composite yarn have been significantly improved.

Example 2: Four-core yarn linen colored yarn

The flax core yarn used is the above-mentioned 36Nm wet-process long hemp spinning flax bleached yarn, and the polyester core yarn specification used is 150D/48F, and the kind is DTY. Red, blue and green polyester colored filament yarns and linen yarns are used to form four-core yarns for wrapping processing.

The wrapping yarn is polyester monofilament with a diameter of 0.08mm and a linear density of 69dtex.

The main process is: the hollow spindle speed is 15435r/min, the yarn drawing speed is 28m/min, the wrapping twist is 551 twists/m, and the wrapping twist is S twist.

The technique of false twist interfering with the twist distribution of the core yarn adopts grooved sleeve type false twister, the axis of the yarn guide hook deviates from the axis of the center tube by 10cm, the angle between the core yarn and the center line of the center tube is 30˚, and the number of grooves on the false twister 8 slots.

The appearance effect of the spun composite yarn is shown in Figures 14 and 15. It can be seen from the figure that the composite yarn presents an irregular color appearance of white (linen yarn) and red, blue, green (polyester filament yarn). The white color of the linen core yarn appears only at the slubs of the linen yarn; the wrapping of the low linear density polyester monofilament (translucent) wrapping yarn has little effect on the color of the core yarn color segment (no significant color mixing effect); Combined and wrapped, the evenness and hairiness of the composite yarn have been significantly improved.

The embodiment should not be regarded as limiting the present invention, and any improvement based on the spirit of the present invention should be within the protection scope of the present invention.

Claims (9)

1. the processing method of a kind of Multicolor segments coloured silk flax, chemical-fibres filaments enveloped composite yarn, it is characterised in that: its step are as follows:

1) using linen and the filament yarn of at least two colors as heart yarn, respectively from respective core by the way of passiveness feeding It is unwound on tube, and merges the filament yarn of linen and at least two colors to form multicore yarn, wherein the long filament of different colours Yarn is separately positioned on the both ends of linen；

2) after multicore yarn passes through spring tensioner, and it is fed to hollow ingot, and be arranged in winding outer outside aluminium ingot pipe Fasciated yarn merges at congregation twizzle, and aluminium ingot pipe loop is on hollow ingot, after wherein multicore yarn passes through spring tensioner Feed the angle having between the route of hollow ingot and the central tube axis of hollow ingot less than 90 °；

3) aluminium ingot pipe revolution at a high speed together with hollow ingot drives outer fasciated yarn revolution at a high speed, outer fasciated yarn is wound into multicore yarn On, and the surface that multicore yarn is located at bushing pipe under central tube forms the grip hold arc of certain angle, and bushing pipe is in the axial direction under central tube Form friction to multicore yarn, false twisting perturbed force；

4) point and outer fasciated yarn are wound from the outer fasciated yarn between the unwinding point on aluminium ingot pipe to multicore yarn in outer fasciated yarn Air ring is formed, and generates tension；

5) multicore yarn under tension, is acted on by torsional moment at winding point and generates torsion turn, and make multicore Yarn generates section color effect under the action of false twisting turn；

6) simultaneously under the action of outer fasciated yarn tension fluctuation and heart yarn tension fluctuation, the significant plucked feature of linen and The false twisting perturbed force of bushing pipe under hollow ingot bottom center pipe, so that section color effect shows as irregularities；

7) and under the looping of outer fasciated yarn, the color effect of irregular section of fixed multicore yarn, obtaining has irregular section of color effect Multicolor segments coloured silk flax, chemical-fibres filaments enveloped composite yarn.

2. the processing method of Multicolor segments coloured silk flax according to claim 1, chemical-fibres filaments enveloped composite yarn, feature exist In, in step 2, the installing tandem twizzle between spring tensioner and hollow ingot, and pass through tandem twizzle The angle less than 90 degree is formed between multicore yarn and the axis of central tube.

3. the processing method of Multicolor segments coloured silk flax according to claim 1, chemical-fibres filaments enveloped composite yarn, feature exist In being arranged telescopic scroll tube in the central tube lower end of hollow ingot, make the multicore come out by spring tensioner in step 2 The path that yarn feeds central tube has the angle less than 90 degree.

4. the processing method of Multicolor segments coloured silk flax according to claim 1, chemical-fibres filaments enveloped composite yarn, feature exist In after making the yarn of two or more different colours and being combined, and being twisted to doubling, make yarn around itself axis Revolution, so that each one thread being arranged parallel to each other originally is twisted together into cylindrical yarn body, doubling occurs between each section Relative torsion, every one thread helically line morphology, so that the torsional variation of each one thread relative position, by yarn appearance along it Spaced color color lump is divided on length direction.

5. the processing method of Multicolor segments coloured silk flax according to claim 1, chemical-fibres filaments enveloped composite yarn, feature exist In the processing method further includes resultant yarn color adjustment method, and resultant yarn color adjustment method is as follows:

One, the section coloured silk Character adjustment of composite yarn is realized by adjusting the twist size of heart yarn and irregular degree；

Two, it is realized by change as the color configuration and linen of the filament yarn of heart yarn, the line density of color polyester yarn multiple It closes yarn and extends adjustment.

6. a kind of using Multicolor segments coloured silk flax, chemical-fibres filaments enveloped composite yarn described in the claims 1,2,3,4 or 5 The composite yarn of processing method processing, it is characterised in that: it includes the filament yarn of linen and Duo Gen different colours and closes twisting shape At the multicore yarn with section color effect, and fasciated yarn, the outer fasciated yarn are colourless, transparent outside looping on the outside of the multicore yarn Long filament, and make multicore yarn generate irregular section color effect in outer fasciated yarn looping, and be outsourced and twine yarn looping and fix.

7. a kind of for Multicolor segments coloured silk flax, chemical-fibres filaments enveloped composite yarn described in the claims 1,2,3,4 or 5 The equipment of processing method processing, which is characterized in that it includes several heart yarn cylinders, and each heart yarn cylinder upper end is correspondingly provided with twizzle, And spring tensioner is arranged in the point of intersection for being located at each twizzle central ray, the exit of spring tensioner is equipped with Hollow ingot is equipped with the center in the path and hollow ingot that make heart yarn feeding hollow ingot between the spring tensioner and hollow ingot The eccentric stiffener less than 90 degree of angles, aluminium ingot of the outer loop setting of the hollow ingot for the outer fasciated yarn of looping are formed between pipe Pipe, and the aluminium ingot pipe is linked with hollow ingot, congregation twizzle, the congregation twizzle is arranged in the upper end of the hollow ingot Upper end be arranged yarn forming device.

8. equipment according to claim 7, it is characterised in that: the eccentric stiffener is tandem twizzle comprising if Dry twizzle arranged side by side.

9. equipment according to claim 7, it is characterised in that: the eccentric stiffener is telescopic scroll tube, the sleeve Formula scroll tube is sleeved on central tube lower end, the inner hole of the lower bushing pipe of the diameter of bore and central tube lower end of the telescopic scroll tube Diameter is consistent, and its lower end surface is arc-shaped curved surface, and several cuttings are arranged by center radioactivity of inner hole.