CN108716041A - It is a kind of have between color characteristic the grey fasciated yarn of fiber crops processing method and the grey fasciated yarn of fiber crops - Google Patents

Abstract

The invention provides a processing method of hemp ash-wrapped yarn with intermediate color characteristics and hemp ash-wrapped yarn, using the principle of mixed color/segment color effect of combining and twisting two yarns of different colors, hollow ingot wrapping spinning outsourcing The specific false twist effect of the core yarn and its twist instability principle when the core yarn is wound by the wrapping yarn, the hollow spindle wrapping spinning technology is adopted, and the double core yarn is composed of two black and white yarns, and the core is aligned by the tension of the outer wrapping yarn The false twist effect of the yarn forms a low-twist "black-white intercolor" effect, and then wrapped with black yarn or white yarn as the outer wrapping yarn to obtain "black-gray" or "white-gray" intercolor characteristics , and the intercolor effect has irregular and random hemp ash wrapped yarn. It can endow the hemp gray yarn fabric with a unique irregular segment color effect. Compared with the evenly distributed hemp gray yarn fabric, the style is more vivid and lively. When the obtained yarns are used as warp yarns for weaving, no sizing is required, and the obtained fabrics do not need to be dyed, and only need necessary finishing processes such as washing and setting to obtain finished fabrics.

Description

A processing method of hemp ash-wrapped yarn with intermediate color characteristics and hemp ash-wrapped yarn

technical field

The invention belongs to the processing technology of pattern-color composite yarn, and in particular relates to a processing method of hemp ash wrapped yarn with intermediate color characteristics and hemp ash wrapped yarn.

Background technique

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.

During the whole spinning process, the following process parameters can be adjusted: ①The pre-drawing ratio of the core yarn. The ratio of the godet feed speed to the core yarn package unwind speed. ② Yarn delivery speed of yarn delivery roller. Since the speed of the hollow ingot (aluminum ingot tube) is constant, changing the yarn drawing speed can not only change the wrapping twist (wrapping twist = aluminum spindle tube speed/yarn drawing speed), but also change the distance between the godet roller and the yarn delivery roller. The drafting ratio of the core wire. ③ Winding draft (winding ratio). The ratio of the winding speed of the winding roller (bobbin) to the yarn delivery speed of the delivery roller determines the winding tension. When spinning elastic yarn, the winding draft should be adjusted so that it is less than 1 and adapted to the draft multiple of the core filament. The larger the draft multiple of the core filament, the smaller the winding ratio.

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.

Through the simple transformation of wrapping yarn spinning equipment, for example, instead of using the original core yarn feeding device on the equipment, and installing a self-designed core yarn tension control device, it is possible to spin non-elastic yarn (silk) as the core yarn. wrapped yarn. For example, stainless steel fiber wrapped yarn can be spun into stainless steel fiber wrapped yarn (usually covered twice) with stainless steel fiber as the core yarn, outsourcing cotton, modal and other spun yarns or nylon, polyester and other filament yarns.

In fact, from the perspective of technical principles, hollow spindle wrapping spinning technology can be identified as "yarn reprocessing technology", that is, using yarn as raw material to reconstruct a new wrapping structure yarn, through different The combination of yarn raw materials can design and process yarns with various structures and properties to achieve the following technical goals: ① Improve the technical defects of certain yarns. For example, wrapping hemp yarn can significantly reduce its hairiness and improve the tactile comfort of its fabric; ② Obtain yarn with comprehensive high performance. Such as cut-resistant yarn spun from glass fiber, high-strength high-modulus polyethylene fiber, etc. ③ Obtain yarns with composite functions. For example, yarns with different functions are used to spin wrapped composite yarns, giving yarns and even their fabrics composite functions; ④ Spinning yarns with a colorful appearance. For example, yarns of different colors are used to spin melange yarns. and many more.

The hollow spindle covering spinning method uses filament yarn or spun yarn as raw material to spin a composite yarn with wrapped structure. Compared with other composite yarn spinning methods that use filament and yarn as raw materials, it has the following characteristics: Wide adaptability of raw materials; stable yarn structure; wide product adaptability; simple equipment principle, convenient process adjustment; high spinning speed, high output, high production efficiency; due to the coalescing effect of wrapping yarn, the yarn quality is good.

The hemp gray yarn, in a narrow sense, refers to the yarn made of black and white short fibers blended. The blending ratio of black fibers and white fibers is different, and the yarns show different gray levels. The larger the blending ratio of black fibers, the better the fiber The darker the grayscale. Hemp gray yarn is mixed with fiber as the color carrier. The appearance of the yarn and fabric and the uniform gray obtained by dyeing have a differentiated visual effect, and the look and feel is more lively and natural, with a sense of hierarchy. In a broad sense, hemp gray can actually be considered as the visual effect of the fabric. Blended hemp gray yarn can be used to give the fabric the appearance of hemp gray, and black yarn and white yarn can be used for cross-twisted yarn, double-twisted yarn, or even black yarn. Interweaving with white yarn can also give the fabric the appearance of hemp gray, but these technologies use yarn as the color carrier for color mixing, the visual effect of the fabric will be different from that of blended hemp gray yarn, and the style is more rough, not as good as Fiber grade color mixing is delicate.

At present, the production of hemp gray yarn mainly adopts blending technology, that is, different proportions of black fibers (natural color, dyed or dope dyed) and white fibers (natural color or bleached) are mixed in the form of short fibers, and then spun. The technology of fiber mixing includes fiber raw material mixing (manual mixing or grasping cotton mixing), cotton sliver mixing (primary mixing method or secondary mixing method), and the key technology is the accuracy of the mixing ratio and the guarantee of mixing uniformity. As a special case of color spinning technology, staple fiber blended hemp yarn technology is widely used in the development of weaving and knitting yarns, and it is a classic color spinning technology.

Merging and twisting of black yarn and white yarn (filament yarn or short yarn) can produce black and white mixed color yarn. Instead, it presents a gray appearance. Including the cross-twisted yarn spun by Siro spinning and Sirofill spinning technology, a similar "hemp gray" effect can be obtained, and the fabric can also be given a hemp gray appearance. These technologies have also been widely used at present, such as the use of black and natural color filament yarns and twisting for weaving home textiles such as sofa releases.

For example, Chinese patent 201420823562.1 discloses a double-wrapped hemp yarn, which specifically discloses that it includes a core yarn, wherein the core yarn is provided with an outer wrapping yarn, and the outer wrapping yarn includes a first outer wrapping yarn and a second wrapping yarn. Two wrapping yarns, at least one black yarn and one white yarn in the core yarn, the first wrapping yarn and the second wrapping yarn, the first wrapping yarn and the second wrapping yarn are wound on The core yarn is outside and covers the core yarn, and the twist direction of the core yarn is opposite to the winding direction of the first wrapping yarn, and the winding directions of the first wrapping yarn and the second wrapping yarn are opposite. The utility model uses the combination of black and white yarns as the core yarn and the outer wrapping yarn respectively to form a three-component composite black and white mixed color yarn with a heather effect. The black and white color combination of the yarn, the linear density of the core yarn and the wrapping yarn, or the wrapping twist of the wrapping yarn can be adjusted. The adjustment is flexible and convenient, and it is easy to control the color rendering ratio and the color rendering color of the finished yarn. However, this patent specifically discloses that the core yarn is wrapped twice by a double-wrapping method, so as to form a three-component composite black-and-white melange yarn with a gray effect.

Contents of the invention

In order to overcome the above technical deficiencies, the present invention provides a processing method of hemp ash-wrapped yarn with secondary color characteristics and hemp ash-wrapped yarn.

The present invention provides a kind of processing method of hemp ash wrapped yarn with secondary color characteristic, it comprises the following steps:

1) Unwind the black yarn and white yarn from the black yarn and white yarn core bobbins respectively by means of negative feeding, and combine the black yarn and white yarn through the yarn guide hook to form a double core yarn;

2) The double-core yarn is guided by the yarn guide rod and fed into the hollow spindle through the spring-type tension device, and the outer wrapping yarn and the double-core yarn that are wound outside the aluminum spindle tube that is looped on the hollow spindle meet at the yarn guide hook meet, and the outer wrapping yarn is black or white;

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 onto the double-core yarn;

4) The outer wrapped yarn between the winding point of the outer wrapped yarn to the double-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 double-core yarn is subjected to false twisting at the winding point to produce torsional twists, forming a low-twist "black-white" intermediate color effect;

6) At the same time, under the influence of tension fluctuations of outer wrapping yarn and core yarn tension, the intermediate color effect is irregular;

7) And under the wrapping of the outer wrapping yarn, the irregular "black-white" intercolor effect is fixed, and the "black-gray" or "white-gray" hemp ash wrapping with irregular intercolor characteristics is obtained composite yarn.

In step 1), yarn guide hooks are provided directly above the central axis of the core yarn tubes of black yarn and white yarn core yarn, and the black yarn and white yarn respectively passing through the corresponding yarn guide hooks are merged by one yarn guide hook Together to form a twin core yarn.

The yarn guiding hook is closed.

The spinning tension adjusted by the spring tension device is greater than or equal to the spinning tension when the running direction of the core yarn between the hollow spindle and the converging yarn guide hook is straight upward.

At least one of the black yarn and white yarn that constitutes the double-core yarn is a twisted core yarn, so as to form a disturbance to the false twist of the core yarn through its twist redistribution under the action of tension, and increase the false twist effect of the core yarn. Regularity.

After the black yarn and the white yarn are combined together, twist the yarn to make the yarn rotate around its own axis, so that the two yarns arranged in parallel to each other are twisted/twisted together, and the gap between each section of the yarn is Relative torsion occurs, and each yarn is in the shape of a helix through twisting. The relative position of the two yarns changes in torsion, and the appearance of the yarn is divided into two color blocks arranged alternately along its length, presenting a segment color effect.

The processing method also includes a method for adjusting the appearance characteristics of the composite yarn, and the method for adjusting the appearance characteristics of the composite yarn is as follows:

1. By adjusting the false twist twist and core yarn tension of black and white double-core yarn, the inter-color feature adjustment of inter-color hemp gray composite yarn can be realized;

2. Adjust the overall gray scale of the composite yarn by changing the distribution ratio of the composite yarn black and white on the surface of the composite yarn.

A kind of hemp ash wrapped yarn processed by the above-mentioned processing method of hemp ash wrapped yarn with intermediate color characteristics, which includes a false twisted core yarn composed of black and white double core yarn, and an outer package is wrapped around the false twisted core yarn Winding.

The outer wrapped yarn is black or white.

Beneficial effects of the present invention: black and white (or natural color) yarns are used as materials, and the hollow ingot wrapping composite technology is used to spin hemp ash yarn with irregular intercolor characteristics, and the hemp ash yarn produced by blending with short fibers Compared with the uniform-colored hemp gray yarn that is simply parallel twisted and wrapped, the most notable feature is that the composite yarn has an irregularly distributed intermediate color effect (similar to the segmented color effect of the segmented colored yarn.), which can endow the hemp gray Compared with the uniformly distributed hemp gray yarn fabric, the unique segment color effect of yarn fabric is more vivid and lively. When the prepared yarn is used as warp yarn for weaving, no sizing is required, the fabric does not need to be dyed, and only necessary finishing processing is required. This technology is suitable for a wide range of raw materials, and can be used for the combination of black, white, gray filament yarn (monofilament or multifilament) and short yarn of any material, and develops yarns with different quality, performance, and function requirements for knitting yarns and weaving yarn production.

Description of drawings

Fig. 1 is a schematic structural view of the "(white+black)+white" intermediate color heather gray wrapped yarn of the present invention.

Fig. 2 is a schematic structural view of the "(white+black)+black" intermediate color heather gray wrapped yarn of the present invention.

Fig. 3 is a schematic diagram of the spinning technology of the present invention.

Fig. 4 is the appearance of the polyester/brocade filament "(white+black)+white" intercolored heather gray yarn in Example 1.

Fig. 5 is the appearance of the compound "(white+black)+black" intercolored hemp gray yarn in Example 2 of Tencel spun yarn/nylon filament yarn.

FIG. 6 is a partially enlarged schematic diagram of FIG. 5 .

Fig. 7 is the appearance of the intercolored hemp gray yarn "(white+black)+white" intercolored hemp gray yarn of Tencel/nylon/polyester-cotton in Example 3.

FIG. 8 is a partially enlarged schematic diagram of FIG. 7 .

Figure 9 shows the appearance of nylon yarn "(white + black) + white" inter-colored hemp gray yarn with different wrapping twists (the appearance of package yarns of 4 kinds of yarns (wrapping twist increases from left to right)).

Figure 10 shows the appearance of nylon yarn "(white + black) + white" intercolored hemp gray yarn with different wrapping twists (comparison of the intercolor effects of the four yarns (wrapping twist increases from top to bottom)).

Figure 11 shows the appearance of nylon yarn "(white + black) + black" intermediate-colored hemp gray yarn with different wrapping twists (the appearance of bobbins of 4 kinds of yarns (wrapping twist increases from left to right)).

Figure 12 shows the appearance of nylon yarn "(white + black) + black" intercolor hemp gray yarn with different wrapping twists (comparison of the intercolor effects of the four yarns (wrapping twist increases from top to bottom)).

Figure 13 is the appearance of the composite yarn knitted jersey fabric ("(white+black)+black" intermediate color heather gray yarn knitted jersey appearance (yarn wrapping twist 560 twists/m)).

Figure 14 is the appearance of the composite yarn knitted jersey fabric (“(white+black)+white” intercolored heather gray yarn knitted jersey appearance (yarn wrapping twist 440 twists/m)).

Fig. 15 is the appearance of the woven fabric of the intermediate color heather gray yarn (the intermediate color heather gray yarn is used as the warp yarn, and the weft yarn is white filament yarn).

Fig. 16 is the appearance of the woven fabric of intermediate color heather gray yarn (both warp and weft directions are heather gray intermediate color yarn).

Fig. 17 is a schematic diagram of the formation principle of color mixing and segment color effect when yarns of different colors are merged and twisted.

Fig. 18 is a schematic diagram of the principle of false twist effect when the core yarn is wound with the outer wrapping yarn of the hollow spindle wrapping spinning.

Detailed ways

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

The invention adopts hollow ingot wrapping spinning technology, uses black and white yarns as raw materials, spins hemp gray yarn with irregular intercolor appearance, and obtains hemp yarn obtained by compound processing with existing blending, twisting and wrapping. A new type of hemp gray yarn with completely different gray appearance characteristics, enriching the color varieties of filament composite yarn.

The invention comprehensively utilizes the principle of mixed color/segment color effect of two yarns of different colors combined and twisted, the specific false twist effect of the core yarn and the principle of twist instability when the core yarn is wound by the hollow spindle wrapping spinning outer wrapping yarn, The hollow spindle wrapping spinning technology is used to form a double-core yarn with black and white yarns, and then the black yarn or white yarn is used as the wrapping yarn for wrapping. Due to the unstable false twist effect of the core yarn, when the black and white double core yarn is wrapped by the outer wrapping yarn, it has a low-twist "black-white intercolor" effect, and the intercolor effect is irregular and random. After the black or white outer wrapping yarn is wrapped on the core yarn, a segmental color effect of "black-hemp gray" or "white-hemp gray" is formed, and the overall yarn appears as hemp gray in human vision (woven into After weaving, the fabric is heather gray.), thus making a heather gray wrapped composite yarn with irregular intercolor characteristics.

As shown in Figure 1, the white segment of the black and white core yarn after false twisting is still white after wrapping the white wrapping yarn, and the black segment is gray after wrapping the white wrapping yarn (the white wrapping yarn divides the black core yarn segment into Black and white small color blocks are arranged alternately, because the yarn itself is very thin, it appears black and white block mixed color hemp gray in human vision); from Figure 2, it can be seen that the black segment of black and white core yarn after false twisting is wrapped with black color It is still black after being wrapped in yarn, and the white segment is heather gray after being wrapped in black yarn.

(1) Adjust the inter-color characteristics of the inter-color hemp gray composite yarn by adjusting the false twist twist and core yarn tension of the black and white double-core yarn. In the spinning process, it is realized by adjusting the moving 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 torsional twist of the black and white core yarn decreases, the black-white segment becomes longer, and the length of the intermediate color segment increases. The tension of the core yarn increases, the torsional rigidity of the core yarn increases, and the length of the inter-color segment increases.

(2) Adjusting the overall gray scale (color depth) of the composite yarn is achieved by changing the distribution ratio of the composite yarn black and white on the surface of the composite yarn. The increase in the black ratio increases the overall gray scale of the yarn; the increase in the white ratio increases the overall grayness of the yarn. The gray scale becomes lighter. In the spinning process, it is mainly realized by adjusting the color of the outer wrapping yarn and the linear density of the black and white yarns in the core yarn and the outer wrapping yarn. With white wrapping yarn, the overall gray scale of the composite yarn is light; with black wrapping yarn, the overall gray scale of the composite yarn is deep. The black yarn density in the core yarn and wrapping yarn increases (the diameter becomes thicker), the overall gray scale of the composite yarn deepens, the white yarn density in the core yarn and wrapping yarn increases, and the overall gray scale of the composite yarn becomes lighter. In addition, the above-mentioned adjustment of the moving speed of the core yarn (yarn drawing speed) can change the wrapping twist of the composite yarn, thereby changing the coverage of the core yarn by the outer wrapping yarn, and also changing the color depth of the composite yarn. If the wrapping yarn is white, the yarn drawing speed increases, the wrapping twist decreases, and the gray scale of the composite yarn deepens; on the contrary, if the wrapping yarn is black, the wrapping twist increases, and the gray scale of the composite yarn deepens. Because this parameter affects the distribution characteristics of secondary colors and yarn properties, it must be considered comprehensively in the spinning process.

As shown in Figure 3, the present invention provides a kind of processing method of the hemp ash wrapped yarn with secondary color characteristic, and it comprises the following steps:

1) The black yarn and white yarn are unwound from the black yarn and white yarn core bobbins respectively by passive feeding, and the black yarn and white yarn are combined to form a double-core yarn through the yarn guide hook,

That is, the black core yarn and the white core yarn are respectively unwound from the core yarn bobbin 1 and 2 under the guidance of the yarn guide hook 3 (the yarn guide hook 3 must be located directly above the central axis of the core yarn bobbin to ensure the smooth unwinding of the yarn. around,) meet at yarn guide hook 4, merge together and move forward. The yarn guide hook is closed type without opening, so as to prevent the yarn from detaching from the yarn guide hook from the opening due to vibration, affecting the normal unwinding and merging of the yarn;

2) The double-core yarn is guided by the yarn guide rod and fed into the hollow spindle through the spring-type tension device, and the outer wrapping yarn and the double-core yarn that are wound outside the aluminum spindle tube that is looped on the hollow spindle meet at the yarn guide hook meet, and the outer wrapping yarn is black or white;

The double-core yarn formed in step 1) passes through the spring-type tension device under the guidance of the yarn guide rod 6. The spring-type tension device is an adjustable spring-tension piece yarn tensioner 5 to ensure a certain feeding tension of the core yarn , under the guidance of the yarn guide rod 7, the double-core yarn enters below the central tube of the hollow spindle 8, passes through the central tube and is drawn out from the upper end, and meets the outer wrapping yarn at the joint yarn guide hook 11, while the aluminum ingot tube looper On the hollow ingot, fix it on the hollow ingot with the lower holder and the ingot cap, so that it can rotate 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, and the outer wrapping yarn is led out from the aluminum ingot tube, and meets the core yarn at the meeting guide hook;

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 onto the double-core yarn;

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

5) Under the action of tension, the double-core yarn is twisted and twisted at the winding point by false twisting, forming a "black-white" intermediate color effect;

6) At the same time, under the influence of tension fluctuations of outer wrapping yarn and core yarn tension, the intermediate color effect is irregular;

7) And under the wrapping of the outer wrapping yarn, the irregular "black-white" intercolor effect is fixed, and the hemp gray wrapped composite yarn with irregular intercolor characteristics is obtained.

The irregular "black-white" intercolor effect of the double-core yarn is wrapped with black or white outer wrapping yarn, so that the yarn will obtain an irregular "black-gray" or "white-gray" appearance, resulting in an irregular Heather Wrapped Composite Yarn with Secondary Color Features. The finished yarn is guided and output by the guide roller, guided by the yarn guide rod 13, passing through the yarn guide ceramic eye on the traverse guide 14, and wound to On the bobbin package 16 that is frictionally driven by the winding roller 15, it is wound into a bobbin.

As shown in Figure 17, after two yarns of different colors (filament yarns or spun yarns) are combined together, if the yarns are twisted (the yarns are rotated around their own axes), they are originally arranged parallel to each other. The two yarns are twisted (twisted) together, and the relative twist occurs between the cross-sections of the parallel yarns. Each time a twist is applied, the two yarns are twisted 360 degrees relative to each other, and the relative positions of the two yarns along the axial direction are converted twice. Second - twist 180 degrees, the two yarns exchange positions → twist 180 degrees again, and the two yarns return to their original positions. After twisting, each yarn assumes a helical shape. The torsion change of the relative position of the two yarns caused by twisting makes the appearance of the yarn show a segmented color effect, that is, the torsion change of the relative position of the two yarns divides the appearance of the yarn into alternate arrangements along its length direction. of two color patches. The greater the degree of twist added to the doubling, the more times the relative positions of the two yarns are exchanged per unit length, the finer the color blocks are divided, and the more obvious the mixing effect of the two colors is. In the eye vision, the yarn shows a mixed color effect; when the twist of the combined yarn is small, the length of the interphase color segment formed by the relative twisting of the two yarns is long, and because the yarn diameter is small, in the vision of the human eye, Yarn appearance tends to be a segmented effect.

At the same time, the outer wrapping yarn rotates with the hollow spindle, and the core yarn is spirally wound to form a wrapping yarn (yarn). The theoretical wrapping twist of wrapping yarn is the ratio of the rotation speed n of the hollow spindle (wrapping yarn) to the yarn drawing-out speed V (without considering the additional rotation speed of the wrapping yarn produced when the wrapping yarn is unwound from the aluminum spindle tube ).

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) Air resistance, centrifugal force, and Coriolis force produced by the high-speed rotation of the hollow spindle (the yarn performs both circular rotation and axial movement, and there is Coriolis inertial force, similar to the yarn guide hook and steel wire of the ring spinning machine The yarn in the balloon section between the rings 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 18 (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 movement direction of the core yarn, 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 18 (3), and its effect is, on the one hand, 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, which will produce the same number of twist turns in opposite directions, as shown in Figure 18 (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 twists are therefore consolidated, and the false twists above the winding point act on the wrapped yarn. Twisting (if there is no wrapping and consolidation of the outer wrapping yarn, the twisting of the core yarn generated below the wrapping point will be offset by the reverse twisting generated above the wrapping point after passing through the wrapping point, and finally there will be 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 wrapping spinning, the false twist effect produced by the tension of the wrapping yarn on the core yarn will keep the core yarn twisted to a certain extent 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 (weak twist). 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 two colors of yarn are used to form a double core yarn and fed together, the false twist effect of the tension of the outer wrapping yarn will cause the core yarn to produce a segment 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-color double-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.

Wherein the spinning tension adjusted by the spring tension device is greater than or equal to the spinning tension when the running direction of the core yarn between the hollow spindle and the converging yarn guide hook is straight upward.

That is, the tension of the core yarn, the primary guarantee is to ensure the normal winding of the core yarn by the outer wrapping yarn. 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 spinning, the tension device should be adjusted so that the movement of the core yarn between the hollow spindle and the meeting guide hook is straight upward. Under this premise, the spinning tension can continue to be increased, but the spinning tension cannot be reduced. Within a certain range, adjusting the spinning tension of the core yarn can adjust the false twist effect of the core yarn, thereby adjusting the secondary color characteristics of the composite yarn.

And for the choice of wrapping twist. 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 size of the wrapping twist determines the degree of wrapping of the core yarn by the outer wrapping yarn, determines the false twist twist of the core yarn and the fineness of the black-white color of the hemp gray yarn segment, and is also the main parameter that determines the mechanical properties of the composite yarn. It 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 intercolor effect of the appearance of the composite yarn should be considered first, because in this technical scheme, the yarn drawing Speed is the main controllable parameter to actively adjust the secondary color characteristics (the adjustment effect is the most significant).

And in order to achieve the effect of hemp ash. The double-core yarn must be composed of one black and one white. The outer wrapping yarn can be black or white, and at least one of the yarns is a filament yarn. The color of the outer wrapped yarn is different, and the overall gray level of the composite yarn is quite different. Two product series can be formed: "(white+black)+black" and "(white+black)+white". It is a light-colored hemp gray series. There are no restrictions on the types of core yarn and outer wrapping yarn (filament yarn, spun yarn, fiber type, spinning method), and linear density, but the yarn type and linear density are different, the torsional rigidity of the core yarn is different, and the tension of the outer wrapping yarn Also different, the overall gray scale and secondary color characteristics of the composite yarn will be different. The core yarn and outer wrapping yarn have different densities and types, and the appearance and performance characteristics of the composite yarn are also different. Reasonable selection can be made according to the use of the composite yarn.

And at least one of the black yarn and the white yarn that constitutes the double-core yarn is a twisted core yarn.

When choosing a twisted yarn as the core yarn (note: some filament yarns are untwisted yarns, such as air network yarns, untwisted multifilament yarns, etc.), the combined double-core yarns will undergo twist redistribution under tension. Phenomenon (according to false twist theory), the yarn is twisted, and the mutual twist similar to false twist is produced on the partial segment along the length direction, which will disturb the false twist effect of the core yarn and also have a certain effect on the secondary color characteristics of the composite yarn. influences. Therefore, the present invention uses at least one twisted core yarn as the core yarn to disturb the false twist of the core yarn through twist redistribution and increase the irregularity of the core yarn false twist effect (composite yarn intercolor effect).

Example 1: Polyester/brocade filament wrapping composite hemp gray intercolored yarn

Design the spinning principle and technology according to this patent, use 70D/24F nylon DTY (Drawn Textured Yarn) twisted filament yarn (twist 120 twist/m) as the core yarn each of black and white, white 70D /36F polyester DTY non-twisted filament yarn is wrapped yarn, spinning "(white+black)+white" intermediate color hemp gray yarn. The hollow spindle speed is 15435r/min, the yarn drawing speed is 23.6m/min, the wrapping twist is 654 twists/m, and the wrapping twist direction is Z twist.

The appearance effect of the spun yarn is shown in Figure 4 as the blackboard diagram of the yarn. It can be seen from the figure that the false twist of the black and white two-color core yarn forms an irregular black-white segment color effect. After being wrapped and fixed by the white outer wrapping yarn, the composite yarn is distributed with white segments of different lengths along its length direction. Black and white mixed color flakes (hemp gray) segment, with irregular intercolor characteristics.

This embodiment shows that this patent can be used to process the hemp gray yarn with irregular intercolor characteristics by using black and white chemical fiber filament yarn as raw material. Filament gauze fabric in a one-tone canvas style.

Embodiment 2: tencel/nylon inter-colored heather gray yarn

Design the spinning principle and technology according to this patent, use 70D/24F black nylon 6 DTY filament yarn and natural color 60S (English count) Tencel (Tencel fiber) ring yarn (spun yarn) to form a double-core yarn, 70D/24F The black nylon 6 DTY filament yarn is wrapped yarn, and it is spun into "(white+black)+black" intermediate color hemp gray yarn. The hollow spindle speed is 15435r/min, the yarn drawing speed is 21.0m/min, the wrapping twist is 735 twists/m, and the wrapping twist direction is S twist.

The appearance effect of the spun yarn is shown in Fig. 5 and Fig. 6 as the blackboard diagram of the yarn. It can be seen from the figure that the false twist of the black and white two-color core yarn forms an irregular black-white segment color effect. After being wrapped and fixed by the black outer wrapping yarn, the composite yarn is distributed along its length with black segments of different lengths and Black and white mixed color flakes (hemp gray) segment, with irregular intercolor characteristics.

This embodiment shows that this patent can be used to process the hemp gray yarn with irregular intercolor characteristics by using black and white chemical fiber filament yarn and natural (white) regenerated fiber spun yarn as raw materials. The beneficial effect is to improve The comfort and surface style of filament yarn fabrics can be used to produce non-uniform color fabric surface style filament/staple fiber composite yarn fabrics.

Embodiment 3: tencel/nylon/polyester-cotton intercolored heather gray yarn

Design the spinning principle and technology according to this patent, use 70D/24F black nylon 6 DTY filament yarn and natural color 60S (English count) Tencel (Tencel fiber) ring yarn (spun yarn) to form a double-core yarn, 60S natural color polyester / Cotton blended combed ring spun yarn is wrapped yarn, spinning "(white+black)+white" intermediate color hemp gray yarn. The hollow spindle speed is 15435r/min, the yarn drawing speed is 21.0m/min, the wrapping twist is 735 twists/m, and the wrapping twist direction is S twist.

The appearance effect of the spun yarn is shown in Fig. 7 and Fig. 8 as the blackboard diagram of the yarn. It can be seen from the figure that the false twist of the black and white two-color core yarn forms an irregular black-white segment color effect. After being wrapped and fixed by the black outer wrapping yarn, the composite yarn is distributed with white segments of different lengths along its length direction. Black and white mixed color flakes (hemp gray) segment, with irregular intercolor characteristics.

This embodiment shows that this patent can be used to process hemp gray yarn with irregular intercolor characteristics by using black and white chemical fiber filament yarn, natural color spun fiber yarn and natural color (white) regenerated fiber spun yarn as raw materials , which has the beneficial effect of producing non-uniform color fabric-style filament/short fiber composite yarn fabrics with multi-fiber component mixed-twisted composite yarns with comprehensive and excellent properties.

Example 4: Double-core-single-wrap nylon intercolored hemp gray yarn

This embodiment shows that changing the wrapping twist, thus changing the false twist effect of the core yarn, and further changing the effect of the intercolor characteristics of the composite yarn.

Using black and white nylon 6 DTY twisted filament yarns with specifications of 70D/24F as raw materials, according to the design of the spinning principle and technology of this patent, two series of inter-color hemp gray yarns with outsourcing white and outsourcing black are spun respectively. Each series is spun with 4 twists of 440 twist/m, 560 twist/m, 735 twist/m and 880 twist/m, and the wrapping twist direction is S twist. The appearance effect of the spun yarn is shown in Figure 9 and Figure 10, Figure 11 and Figure 12.

It can be seen from Figure 9 and Figure 10 and Figure 11 and Figure 12 that the overall appearance of the composite yarn is heather gray (appearance of the package yarn); with the increase of wrapping twist, the twist of the false twist effect of the core yarn increases, and the intercolor of the composite yarn increases. The segment length becomes shorter; as the wrapping twist increases, the color blocks of the black and white mixed color segments are more delicately divided, and the color mixing effect is better; as the wrapping twist increases, the coverage of the outer wrapping yarn on the core yarn increases , the overall color depth (grayscale) of the composite yarn increases.

Figure 13 and Figure 14 are the composite yarn knitted jersey appearance. It can be seen from the figure that the appearance of the intercolored heather gray composite yarn knitted fabric is uneven heather gray as a whole, which has a "camouflage" effect. The selection of wrapping yarns of different colors has a great influence on the overall gray scale of the fabric. The white wrapping fabric is gray-white, and the gray wrapping fabric is gray-black.

By weaving woven fabrics with heather yarns with irregular intermediate color characteristics, it is possible to obtain a heather appearance similar to the "duancai" fabric style. As shown in Fig. 15 and Fig. 16, it is the appearance of the woven fabric with intermediate-colored hemp gray yarn as warp yarn, white polyester filament yarn as weft yarn, and intermediate-colored hemp gray yarn in both warp and weft directions. Compared with the heather gray effect of evenly distributed black and white mixed colors, the style of the second-color heather gray yarn fabric is more rough and lively, with special cloth surface texture and rhythm.

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. it is a kind of have between color characteristic the grey fasciated yarn of fiber crops processing method, it is characterised in that：It includes the following steps：

1）Unwind crape and white yarn from crape and white yarn core tube respectively in such a way that passiveness is fed, and will by twizzle Crape and white yarn merge to form twin-core yarn；

2）Twin-core yarn is guided by lever jack and feeds hollow ingot through spring tensioner, and is wound and be arranged in kink in hollow ingot On aluminium ingot pipe outside outer fasciated yarn and twin-core yarn merges at congregation twizzle, and the outer fasciated yarn is black or white；

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 twin-core yarn On；

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

5）Twin-core yarn under tension, is acted on by false twisting at winding point and generates torsion turn, formation low twist " black- Secondary color effect in vain "；

6）Simultaneously under the action of outer fasciated yarn tension fluctuation and heart yarn tension fluctuation so that secondary color effect shows as irregular Property；

7）And under the looping of outer fasciated yarn so that " black-and-white " secondary color effect of irregularities is fixed, and obtaining has irregular " black-ash " or the grey enveloped composite yarn of " white-ash " fiber crops of color characteristic.

2. it is according to claim 1 have between color characteristic the grey fasciated yarn of fiber crops processing method, which is characterized in that step 1） In, it is respectively provided with twizzle right over the heart yarn cylinder central axis of crape and white yarn core tube, and be each passed through corresponding twizzle Crape and white yarn merge to form twin-core yarn by a twizzle.

3. it is according to claim 1 or 2 have between color characteristic the grey fasciated yarn of fiber crops processing method, which is characterized in that institute It is enclosed shape to state twizzle.

4. it is according to claim 1 have between color characteristic the grey fasciated yarn of fiber crops processing method, which is characterized in that the bullet The spinning tension of spring formula tensioner adjustment, which is greater than or equal to, to be made double to make heart yarn in hollow ingot to the operation between congregation twizzle Direction is spinning tension when straight line is upward.

5. it is according to claim 1 have between color characteristic the grey fasciated yarn of fiber crops processing method, which is characterized in that constitute double It is at least a kind of to there is twirl heart yarn in the crape of heart yarn and white yarn, to act on shape by its turn redistribution under tension The disturbance of pairs of heart yarn false twisting, increases the irregularities of heart yarn false twist effect.

6. it is according to claim 1 have between color characteristic the grey fasciated yarn of fiber crops processing method, which is characterized in that by crape With white yarn and after being combined, doubling is twisted, so that yarn is turned round around itself axis so that two to be arranged parallel to each other One thread twist/it is twisted that between each section relative torsion occurs for doubling together, keep every one thread helically linear by twisting State, the torsional variation of two one thread relative positions, by yarn appearance along its length on be divided into two kinds of spaced face Section color effect is presented in color color lump.

7. it is according to claim 1 have between color characteristic the grey fasciated yarn of fiber crops processing method, which is characterized in that processing side Method further includes complex yarn external appearance characteristic method of adjustment, and the complex yarn external appearance characteristic method of adjustment is as follows：

One, the grey composite yarn secondary color Character adjustment of secondary color fiber crops is realized by adjusting the false twisting twist and heart yarn tension of black and white twin-core yarn；

Two, by change composite yarn, black, the white distribution ratio on composite yarn surface is realized to adjust composite yarn overall intensity.

8. a kind of processing of the grey fasciated yarn of fiber crops using color characteristic between having described in the claims 1,2,3,4,5,6 or 7 The grey fasciated yarn of fiber crops of method processing, it is characterised in that：It includes the false twisting heart yarn being made of black and white twin-core yarn, in the false twisting core It is wrapped with outsourcing outside yarn and twines yarn.

9. the grey fasciated yarn of fiber crops according to claim 8, it is characterised in that：The outer fasciated yarn is black or white.