JP4084754B2 - Spinning twisted yarn and method for producing the same - Google Patents

Description

The present invention relates to a finely spun twisted yarn obtained by twisting two drafted fiber bundles and a method for producing the same.

Conventionally, fine spinning and twisting yarns have been manufactured by a method in which two rovings are mainly supplied to a draft area of a ring spinning machine, drafted at a predetermined magnification, and then twisted. Since the spun and twisted yarn is also a spun yarn, there are fluff on the surface, and the fluff gives the fabric a texture such as touch, warmth or bulkiness. However, due to the flaws such as reduced strength due to fluffing and easy formation of fluff, it was attempted to suppress fuzzing by mixing heat-adhesive fibers. Since it is tightened, the texture of the fabric is hard and the rebound is poor (see, for example, Patent Document 1).

  Therefore, in order to solve this problem, the short fiber constituting the cross-section of the spun and twisted yarn has a specific strength, and the number of short fibers constituting the cross-section and the average fiber length of the short fiber are specified. A fine spinning twisted yarn satisfying the formula has been proposed (see, for example, Patent Document 2).

  This fine spinning spun yarn is not only excellent in strength, but also has a normal yarn number and a fluff index of 1 mm or more is less than half of conventional fine spinning spun yarn, so that the fabric comprising the fine spun yarn is glossy The fabric is harmonious with a feeling of softness. However, this spinning spun twisted yarn is a combination of the fiber length of the short fibers, the number of short fibers in the cross section, and the spinning tension at the time of spinning using a normal ring spinning machine. Therefore, since the optimum condition for reducing the fluff is experimentally obtained and only obtained based on it, for example, as a constituent short fiber, short cotton having a short fiber length or wool having a long fiber length cannot be used. In addition, there is a problem that it is very difficult to design a yarn that matches the application, such as the fine spinning and twisting yarn obtained is limited to thick to medium yarn.

  After that, improvement of the above technology has been attempted, but the technology related to the fine spun yarn with less fluff and excellent strength can be appropriately changed according to the purpose, such as the type of short fiber and the number of fine spun yarn obtained. Not yet proposed.

  On the other hand, in the field of single spun yarn, the above technology has already been established.

  Representative examples include compact yarn and migrate yarn. The former wraps the fiber bundle after drafting with air during spinning, and the latter gently presses the fiber bundle immediately after passing the front roller. That is to lie down the fluff.

  That is, in the former, a fiber bundle converging device is provided on the downstream side of the draft region of the ring spinning machine, and the fiber bundle is converged by this device, and a compact yarn is spun. Various types of fiber bundle concentrating devices have been proposed. For example, a suction unit extending upstream and downstream across the nip point of the delivery roller, and rotating along the suction unit A fiber bundle focusing device with a ventilated apron is raised. The fiber bundle is pressed by the ventilation apron and converges by receiving a suction action from the suction portion through the ventilation apron. Since this suction action continues even after the nip point has passed, it is possible to spin a yarn in which the fluff is suppressed in addition to the small fluff (see, for example, Patent Document 3).

  As an example of the latter, the migrated yarn is spun by the fiber bundle immediately after passing through the front roller being lightly pressed by the arcuate guide nose. In this case, since the air flow generated by the rotation of the front roller flows along the tip wall surface of the arcuate guide nose, both ends of the short fiber are more actively guided toward the center of the twisting point (for example, Patent Documents). 4).

  In addition to these, a technique has been proposed in which after a single spun yarn is obtained by a normal method, the fluff is turned down in the rewinding step.

  For example, the fuzz is turned down by applying a twisting action by swirling flow to a single spun yarn, and the distance from the nozzle means that generates swirling flow to the upstream (untwisting) twisting means Is used for a longer time than the distance from the nozzle means to the downstream (twisting side) twist-preventing means (see, for example, Patent Document 5).

With this device, long fluff can be untwisted sufficiently and twisted by reducing the centrifugal force of the fluff, so that the long fluff can be effectively turned down.
JP-A-60-181331 (Claims) JP-A-6-330429 (Claim 1, paragraph [0021]) JP 2003-155631 A (paragraphs [0017], [0018]) Japanese Unexamined Patent Publication No. 11-21729 (paragraphs [0012] and [0030]) JP 2001-295145 A (paragraph [0006])

From the above, it can be considered that if the method for producing a compact yarn or a migrated yarn is directly applied to the production of a fine spinning yarn, a fine spinning yarn with less fluff can be obtained.
That is, in the downstream side of the draft region, a fiber bundle converging device having a suction portion or an arcuate guide nose is disposed on the yarn path of two fiber bundles to converge each fiber bundle.
However, when the former fiber bundle converging device is arranged, when the yarn path of the fiber bundle is shaken to the left and right in the traveling direction due to the tension fluctuation during traveling, the fiber bundle is strongly attracted by the respective suction portions. Therefore, a phenomenon occurs in which one fiber bundle is drawn into the yarn path of the other fiber bundle. Further, when the latter arcuate guide nose is provided, the air flow generated by the rotation of the front roller described above is not evenly distributed to the two, so that the migration action does not sufficiently proceed to the two fiber bundles, and the fluff The effect of lying down is reduced. In addition, the fiber bundle is usually pressed by an arcuate guide nose to cause a deviation between the short fibers constituting the fiber bundle. However, particularly when a fine count yarn is spun, the deviation easily causes the yarn breakage. There is a problem of doing.

Therefore, further study is necessary to obtain a finely spun and twisted yarn with less fluff.
On the other hand, as another approach, there is an idea of using two twisted yarns obtained by twisting two finely spun yarns as an alternative to the finely spun yarn. However, the fine spinning twisted yarn and the two twisted twisted yarns are the fiber raw material, the count and the number of twists (in the case of fine spinning twisted yarns, the number of twists at the time of spinning, and in the case of two twisted twisted yarns, the number of upper twists) Even if the yarn is the same, the twisted yarn (twisted single yarn of the spun yarn) is subjected to a lower twist. Therefore, when the fabric is used, the fabric using the finely spun yarn is more bulging. A feeling and a bulky feeling are expressed. As a result, substitution is only useful for some applications.
Therefore, even if two spun yarns such as compact yarns and migrate yarns with few fluffs are twisted, the fluffs on the surface of the yarn are laid down. However, for the reasons described above, problems remain in the texture and application.

  As described above, an object of the present invention is to provide a high-quality spun spun yarn with less fluff, particularly a fine count spun spun yarn excellent in strength, and a stable method for producing such a spun spun yarn. It is in.

  The inventors of the present invention have studied the cause of unstable operation in producing a finely spun and twisted yarn with less fluff, and the cause is the distance between the fiber bundles when the two fiber bundles pass through the fiber bundle converging device. Based on the idea of this, after earnestly researching, after being supplied at a specific interval, it was found that a finely spun and twisted yarn with less fluff can be manufactured stably by being sent to the twisted region at a specific interval. It led to the invention.

That is, the gist of the present invention is a fine spinning and twisting yarn characterized in that, in ring spinning, an average fluff index of 3 mm or more is 40 or less, and a semi-synthetic fiber, regenerated fiber or natural fiber is included as a material. Furthermore, as a preferred embodiment, a fine spinning and twisting yarn characterized by being an English cotton count of 120 to 180, and further a fine spinning and twisting yarn characterized by having a strength utilization factor of 30% or more. included.

  Further, the present invention provides a method for producing a spun-twisted yarn in which two fiber bundles that have passed through the draft region in parallel are twisted, and the two fiber bundles are disposed downstream of the draft region. A ventilation apron that is supplied to the fiber bundle converging device at an interval of 10 mm or more and then rotated along a rotating roller disposed downstream of the fiber bundle converging device from a suction portion drilled in the fiber bundle converging device Then, the air is passed through the ventilated apron and the delivery roller that rotates along the ventilated apron. The gist is a method for producing a spun yarn.

  Furthermore, in the present invention, the suction part drilled in the fiber bundle converging device is two slit-like suction parts arranged in a substantially C shape, and the lengths of the suction parts are equal, Both the widths are 1 to 3 mm, the upstream end interval of each suction part is 10 to 15 mm, the downstream end interval is 3 to 5 mm, and the line segment connecting the upstream ends of each suction part, and the downstream A preferred embodiment includes a method for producing a spun-twisted yarn, wherein the line segments connecting the side ends are parallel, and the distance between the line segments is 15 to 25 mm.

  The spun yarn of the present invention is superior in strength compared to the conventional yarn of the same number because there are few fluffs on the surface of the yarn. Furthermore, if a fabric is produced using the spun yarn of the present invention, it has a mellow gloss and suppleness. A fabric having a good texture can be obtained. Moreover, in the present invention, since the fiber bundle is converged by the fiber bundle converging apparatus, the yarn is twisted, and thus finely finely spun and twisted yarns of No. 120 to 180, which have conventionally been difficult to spin, can be stably obtained. .

  The present invention is described in detail below.

  First, the fine spinning / twisting yarn of the present invention is a ring fine spinning yarn.

  The spun yarn is generally classified into a ring spinning yarn obtained from a ring spinning machine and an open end spinning yarn obtained from an open end spinning machine. The ring spinning yarn has the advantage that it is excellent in strength as compared with the open-end spinning yarn, but has the disadvantage that the bulkiness is slightly poor and there are many fluffs and spots. However, a finely spun and twisted yarn cannot be obtained from the open-end spinning machine because of the structure, and therefore the finely spun and twisted yarn of the present invention needs to be a ring spun yarn.

  The form of the fiber raw material used in the present invention is a short fiber, and any material may be used as long as it is in the form of a short fiber. However, since the fabric using the fine spinning and twisted yarn of the present invention is mainly used for clothing, the fineness of the short fiber as the fiber raw material is 0.5 to 3.5 dtex, and the fiber length is 10 to 80 mm. Preferably, the material is synthetic fiber such as polyester, polyamide or acrylic, semi-synthetic fiber such as triacetate, recycled fiber such as viscose rayon, cupra or solvent-spun cellulose fiber, or natural fiber such as cotton, hemp or wool Is preferred. Among them, cotton or solvent-spun cellulose fiber having a fineness of 0.9 to 1.8 dtex and a fiber length of 24 to 48 mm can be made into a fabric, with an appropriate crease resistance and excellent dimensional stability, as well as a feeling of swelling and resilience. Etc. can be expressed, and it is preferable because it can be used for various purposes. In the present invention, the short fibers may be used alone or in combination according to the purpose.

  Next, the spun yarn of the present invention needs to have an average fluff index of 3 mm or more and 40 or less.

  The average fluff index refers to the average value of the fluff index measured by a method based on the JIS L1095 9.22.2B method. Specifically, a parallel light beam in one direction perpendicular to the fine spinning and twisting yarn is applied, and a fluff image is projected on a shielding plate installed on the opposite side of the light source when viewed from the fine spinning and twisting yarn. The number of fluffs corresponds to the fluff index. The measurement is performed 30 times with a sample length of 10 m using an F-INDEX tester (manufactured by Shikishima Boseki Co., Ltd.), and the average value is taken as the average fluff index.

  The fluff gives the fabric a soft texture, but does not contribute at all to the strength of the fine spinning twisted yarn, so the less the fluff, the better the strength of the fine spinning twisted yarn. Furthermore, the more long fluff is present, the less glossy the fabric is, and the more easily fuzz is formed. Particularly, when there are many fluffs of 3 mm or more, the strength of the fine spinning yarn tends to be remarkably lowered. Glossiness is also significantly reduced and pills are very easy to make. Accordingly, in the finely spun yarn of the present invention, the average fluff index of 3 mm or more is required to be 40 or less, and 10 to 40 is preferable. This is because it is preferable that an average fluff index of 3 mm or more is 10 to 40 for a finely spun and twisted yarn having too little fluff because it is practically difficult to manufacture and is not practical.

  Further, as the tendency of the fine spinning twisted yarn of the present invention, since the fabric has a supple texture when the fineness becomes fine, the fine spinning twisted yarn preferably has a count of 120 to 180. If the yarn count of the fine spinning and twisted yarn is thicker than 120, it is not preferable because the supple texture of the fabric tends to be reduced. On the other hand, if it is thinner than 180, it is not preferable because it is actually difficult to manufacture.

  Further, the finely spun yarn of the present invention preferably has a strength utilization factor of 30% or more, more preferably 30 to 70%. Strength utilization indicates the ratio between the total strength of the short fibers that make up the spun yarn and the strength of the spun yarn as the yarn. The higher the strength utilization rate, the better the strength. As described above, if the amount of fluff is reduced, the strength utilization rate of the finely spun yarn is increased accordingly.

  In the finely spun and twisted yarn of the present invention, if the strength utilization rate is less than 30%, yarn breakage frequently occurs particularly in spinning of fine count yarn, which is not preferable. In the spun twisted yarn of the present invention, it is preferable that the strength utilization rate is high. However, if it exceeds 70%, the fluff is extremely reduced, and the fiber raw material is limited to isometric fibers such as synthetic fibers. The tendency to be impractical increases.

  The strength utilization rate is measured by first taking an optical micrograph of a cross-section of a finely spun twisted yarn by a method based on JIS L1030-1 5.4, for each raw material of short fibers constituting the finely spun twisted yarn. Record the number. Next, the spun yarn is untwisted and the short fibers are separated according to the fiber raw material. If the short fibers are natural fibers, JIS L1069 7.1 is used. If the short fibers are other than natural fibers, JIS L1015 8.7 is applied. The tensile strength of the short fiber is measured 30 times for each fiber raw material by a compliant method, and the average value is calculated. Multiply this value by the number of fiber raw materials previously recorded and add up (this value is X). Furthermore, separately, the tensile strength of the fine spinning twisted yarn is measured by a method based on JIS L1095 9.5.1 (this value is assumed to be Y). Next, the ratio of X and Y (Y / X × 100) is calculated and used as the intensity utilization rate.

  Next, a method for producing the finely spun yarn of the present invention will be described.

  In the present invention, a fiber bundle converging device is disposed downstream of the draft region in the production of the fine spinning and twisted yarn. The two fiber bundles are supplied to the fiber bundle converging device at specific intervals, and then the fiber bundles are sent out to the twisted region at specific intervals.

  The fiber bundle referred to in the present invention refers to an aggregate in which individual fibers are arranged in parallel in a substantially constant direction to form a belt shape. The draft region refers to a region where the fiber bundle is linearly stretched in the ring spinning machine, that is, a portion from the back roller to the front roller, and the surface speed of the front roller is set higher than the surface speed of the back roller. Thus, the fibers can be aligned in the length direction and the number of fibers in an arbitrary cross section of the fiber bundle can be made as uniform as possible. Furthermore, a twist area | region refers to the area | region between a snell wire and a traveler.

  In the method for producing a spun-twisted yarn of the present invention, after obtaining the above-described roving containing short fibers by a known method, the roving is fed to a ring spinning machine having a fiber bundle converging device downstream of the draft region. Insert this book.

  FIG. 1 is a schematic perspective view showing a main part of an example of a ring spinning machine used in the present invention.

  The roving yarns 11a and 11b supplied to the spinning machine are supplied in parallel from the trumpet 1a and 1b to the back roller 2, respectively. The roving yarn is drafted at a predetermined magnification in the draft region composed of the back roller 2, the middle roller 3 and the front roller 4, and becomes fiber bundles 21a and 21b, respectively.

  The fiber bundles 21a and 21b are supplied in parallel to the fiber bundle converging device 5 and further converged by receiving a suction action from the suction portion formed in the fiber bundle converging device 5 via the ventilation apron 6. . The ventilation apron 6 rotates along a rotating roller 7 disposed downstream of the fiber bundle converging device 5. Here, the fiber bundles 21a and 21b being supplied to the fiber bundle converging device 5 does not mean that the fiber bundles 21a and 21b are introduced into the fiber bundle converging device 5, but the fiber bundles. It means that 21a and 21b are introduced into the region where the suction action of the fiber bundle converging device 5 is reached.

Immediately after passing through the front roller 4, the surface of the fiber bundles 21a and 21b is opened by the airflow generated by the rotation of the front roller 4, and fluff is once generated on the surface. The fluff is generated by the fiber bundles 21a and 21b. In the process of receiving the suction action and being pressed against the ventilated apron 6, it becomes parallel to the fiber bundle body, and the fluff is returned to the surface of the fiber bundle, that is, fuzz is suppressed.
In the present invention, the distance between the fiber bundles 21a and 21b when being supplied to the fiber bundle converging device 5, that is, the fiber bundles 21a and 21b at the point where the fiber bundles 21a and 21b start to receive a suction action from the fiber bundle converging device 5. The interval of 21b is preferably 10 mm or more, and more preferably 10 to 15 mm. This interval is adjusted by adjusting the interval between the trumpet 1a and 1b. When the distance between the fiber bundles 21a and 21b is less than 10 mm, the distance is narrow, and when the yarn path of the fiber bundles 21a and / or 22b sways to the left and right in the traveling direction due to fluctuations in tension during travel, one fiber bundle is It is not preferable because it may be drawn into the yarn path of the other fiber bundle. When the fiber bundle is drawn into the other, the fibers constituting the fiber bundles 21a and 21b are mixed together to form one fiber bundle, which becomes a single spun yarn after twisting. On the other hand, if it exceeds 15 mm, depending on the model, there is a risk of exceeding the working width of the draft roller during traveling, which is not practical.

  The fiber bundles 21a and 21b are subjected to a suction action by the fiber bundle converging device 5, and then nipped by the ventilation apron 6 and the delivery roller 8 and sent out to the twisting region. In this case, the air flow generated by the rotation of the delivery roller 8 acts to promote the generation of fluff on the surfaces of the fiber bundles 21a and 21b. However, the surface converges due to the above suction action, and thus fluff is generated. Absent.

  The delivery roller 8 is disposed downstream of the fiber bundle converging device 5 and rotates along the ventilation apron 6. At this time, the distance between the grip points of the front top roller 4a and the delivery roller 8 (the distance between the centers of the rollers) is not particularly limited, but it is possible to reliably prevent the fibers constituting the fiber bundle from being cut and / or floated. And 38-42 mm is preferable to send out the fiber bundle without thickness unevenness to the twist region.

  In the present invention, it is preferable that the distance between the fiber bundles 21a and 21b when the fiber bundles 21a and 21b guided by the ventilation apron 6 are nipped by the delivery roller 8, that is, the nip point interval is 3 to 5 mm. The fiber bundles 21a and 21b form the V zone 30 by propagation of twist between the nip point and the snell wire 40. However, when the gap between the nip points is less than 3 mm, the twist propagates to the vicinity of the nip point and the fiber bundles 21a and 21b. Are not preferable because the fibers constituting the fiber are mixed with each other and easily become one fiber bundle. On the other hand, if it exceeds 5 mm, the V zone 30 is formed, but the V zone angle α becomes large, and the yarn paths of the fiber bundles 21a and 21b are bent significantly from the two-pip point until they overlap through the V zone 30. Therefore, the fiber bundles 21a and 21b are not preferable because high tension is applied to the fiber bundles 21a and 21b.

  Next, the fiber bundle converging device 5 will be described.

  The shape of the fiber bundle converging device 5 used in the present invention is not particularly limited as long as a suction part that can be made to converge by applying a suction action to the fiber bundles 21a and 21b is provided. The shape of the suction portion may be any shape as long as a plurality of suction portions having a dot shape or a ring shape are connected in a beaded manner so as to reliably perform a suction action on the fiber bundle. However, in order to apply the suction action to the two fiber bundles equally and continuously with a constant strength, the shape of the suction portion 9 is preferably a slit shape as shown in FIGS. In particular, if the shape of the suction portion 9 is substantially C-shaped as shown in FIG. 3, the suction action can be reliably applied to the two fiber bundles with a small amount of air consumption, and further due to the fluff and dust. This is particularly preferable because clogging of the suction portion 9 is difficult to occur. In this case, the length of each suction part 9 is equal, the width (corresponding to A in the figure) is 1 to 3 mm, and the upstream end interval (corresponding to B in the figure) of each suction part is 10 to 15 mm and downstream. The distance between the side ends (corresponding to C in the figure) is 3 to 5 mm, and the line segment connecting the upstream ends of each suction part 9 and the line segment connecting the downstream ends are parallel to each other. The distance of minutes (corresponding to D in the figure) is preferably 15 to 25 mm.

  In addition, if the width A of the slit-like suction part 9 is less than 1 mm, the region where the suction action works strongly is reduced accordingly. The fiber bundle is not preferable because the yarn path may fluctuate from side to side in the direction of travel due to fluctuations in tension during travel, and the above-mentioned region tends to come off when swung. In addition, if it exceeds 3 mm, the region in which the suction action strongly acts is also widened, so that the fibers constituting the fiber bundle tend to spread in the left-right direction of the yarn path. For this reason, unless the air consumption is increased, it is difficult to obtain a sufficient convergence effect, and since the width A is wide, fluff and dust are likely to enter the suction portion 9 and may cause clogging.

  Furthermore, since each fiber bundle receives a suction action from each suction portion 9, the yarn path of each fiber bundle is arranged so as to substantially overlap each suction portion 9. Therefore, with respect to the upstream end interval B and the downstream end interval C of each suction part 9, the upstream end interval B and the downstream end are considered from the viewpoint that if the yarn path of the fiber bundle is bent, yarn breakage and uneven thickness are likely to occur. If the side end spacing C is 10 to 15 mm and 3 to 5 mm, respectively, it is preferable because the yarn path is less bent when the fiber bundle passes through the fiber bundle converging device.

  Moreover, it is preferable that the distance (equivalent to D in a figure) of the line segment which connects the upstream terminal ends of each suction part 9 in FIG. 3, and the line segment which connects downstream terminal ends is 15-25 mm. If it is less than 15 mm, the length of each suction portion 9 is shortened, and air consumption must be increased in order to give a sufficient suction action to the fiber bundle, which is not preferable. On the other hand, if it exceeds 25 mm, the fiber bundle converging apparatus becomes large, and the gripping point distance between the front top roller and the delivery roller must be larger than the practically advantageous 38 to 42 mm, which is not preferable.

  Further, it is preferable that the figure formed by the two line segments and the two suction portions 9 have an isosceles trapezoidal shape. In other words, it is preferable that the positional relationship between the two line segments described above is parallel and the lengths of the suction portions 9 are equal. This is because the fiber bundle converging device 5 is arranged so that a straight line that is orthogonal to the two line segments described above and bisects the area of the figure and a straight line located at the center of the fiber bundles 21a and 21b coincide. Then, the yarn paths of the fiber bundles have substantially the same degree of bending, and the tension applied to the fiber bundles is the same. Furthermore, when the lengths of the suction portions 9 are equal, the suction capabilities of the suction portions 9 are the same, so that the convergence effects of the fiber bundles are approximately the same. Even if the suction ability is the same, if the tension applied to each fiber bundle is not the same level, the convergence effect will be different, leading to irritation and the like when it is made into a fabric.

  The fiber bundles 21a and 21b converged by the fiber bundle converging apparatus 5 described above are nipped by the ventilation apron 6 and the delivery roller 8 and sent downstream, and then form a V zone 30 before the twisting region and overlap. Thereafter, the yarn is twisted in the twisted region to become a fine spinning spun twisted yarn 50 with less fluff. In the twisting mechanism in the twisting region, for example, a real twist is imparted by a traveler 41 and a ring 42 as shown in FIG.

Although the twist coefficient of the fine spinning union twisted yarn 50 is not particularly limited, in consideration of operability, 2.8 to 5.0 (K = T / S ^1/2 where K: twist coefficient, T: It is preferable that the number of twists between 1 strands is S: the number of fine spinning and twisted yarn (English cotton count).

  Thus, the finely spun yarn obtained by the present invention is twisted after converging the fiber bundle, so that the fluff on the yarn surface is less than the average fluff index of 40 or less, and the strength is higher than that of the conventional finely spun yarn. high. Therefore, it is possible to produce a super fine yarn that has been difficult to spin by a known method. According to the present invention, for example, if a fiber raw material having a fineness of 1.3 dtex or less and a fiber length of 35 mm or more is used, the number of short fibers in the cross section of the single spun yarn constituting the finely spun yarn is 15-30. It is possible to obtain a fine spinning and twisting yarn of 120 to 180, which is about this.

  Next, the fine spinning and twisting yarn obtained by the present invention and the fabric using the fine spinning and twisting yarn will be described. When a fabric is produced using the finely spun yarn obtained according to the present invention, a fabric having a mellow luster and a supple texture can be obtained. The use ratio of the fine spinning and twisting yarn is preferably 50% by mass or more based on the mass of the fabric, and if it is less than 50% by mass, the characteristics of the fine spinning and twisting yarn may not be fully utilized on the fabric.

  In addition, the said fabric is mainly used for a clothing use, and is used suitably especially for a shirt fabric, pants, a jacket, etc.

  In addition, by appropriately selecting the fine spinning twisted yarn count and fiber raw material, it is possible to produce a fabric having the desired texture. For example, if you want to emphasize glossiness and suppleness at the same time, use 120-180 fine spun yarns, and if you want to achieve peach skin touch, use a fiber material with a fineness of 1.0 dtex or less. .

(Example)
Hereinafter, the present invention will be described more specifically with reference to examples. In addition, the measuring method of the characteristic value in an Example and a comparative example is as follows.
(1) Tensile strength Based on JIS L1095 9.5.1, the tensile strength was measured at a sample length of 25 cm and a tensile speed of 30 cm / min.
(2) Using an average fluff index F-INDEX tester (manufactured by Shikishima Boseki Co., Ltd.), the number of fluff with a length of 3 mm or more was measured 30 times at a sample length of 10 m and a yarn speed of 30 m / min. It was an index.
(3) Strength utilization rate First, an optical micrograph of a cross-section of a finely spun twisted yarn is taken by a method in accordance with JIS L1030-1 5.4, and the number is recorded for each raw material of the short fibers constituting the finely spun twisted yarn. . Next, the spun yarn is untwisted and the short fibers are separated according to the fiber raw material. If the short fibers are natural fibers, JIS L1069 7.1 is used. If the short fibers are other than natural fibers, JIS L1015 8.7 is applied. The tensile strength of the short fiber is measured 30 times for each fiber raw material by a compliant method, and the average value is calculated. Multiply this value by the number of fiber raw materials previously recorded and add up (this value is X). From the X and the tensile strength of the spun-twisted yarn measured in (1) above (this value is assumed to be Y), the ratio of Y to X (Y / X × 100) is calculated, To do.
(4) In the operational spinning process, the number of yarn breaks per 400 spindles per hour and the number of pull-ins were counted. Here, the drawing refers to a phenomenon in which one fiber bundle is drawn into the yarn path of the other fiber bundle and becomes a single spun yarn.

Cotton fibers having a fineness of 1.14 dtex and a fiber length of 36 mm were sequentially introduced into each of the blended cotton, card, comb, kneading and roving processes to obtain a 40 yarn / 30 yard roving.
Next, the two roving yarns (11a, 11b) obtained above to the ring spinning machine in which the fiber bundle concentrating device 5 as shown in FIG. 3 is arranged and the main part is as shown in FIG. Was introduced. In addition, the gripping point distance between the front top roller 4a and the delivery roller 8 is 40 mm, and the suction part 9 of the fiber bundle focusing device 5 is A = 2 mm, B = 12 mm, C = 4 mm, and D = 20 mm. The positions of the trumpets 1a and 1b are adjusted so that the distance between the yarn paths of the roving yarns 11a and 11b is 13 mm, and the roving yarns 11a and 11b are supplied from the trumpet 1a and 1b to the back roller 2 to 44.8 times. A total draft was applied to make the rovings 11a and 11b into fiber bundles 21a and 21b, respectively. Subsequently, the fiber bundles 21a and 21b were supplied to the fiber bundle concentrating device 5 at an interval of 12 mm, and converged by receiving a suction action from the suction portion 9 via the ventilation apron 6 rotating along the rotating roller 7.
After the convergence, the fiber bundles 21a and 21b are fed downstream by the ventilation apron 6 and the delivery roller 8 at a nip point interval of 4 mm in the delivery roller 8 and then overlap to form a V zone 30 before the twisting region. The yarn was spun at K = 4.0 and spun as a fine spinning spun twisted yarn 50 with less fluff of 280 count twin yarn (ie, 140 count).
(Comparative Example 1)
The roving used in Example 1 was spun as a 280-twisted fine spinning twisted yarn by a known method.

Except for changing the suction part of the fiber bundle concentrator to C = 3 mm and D = 18 mm and changing the total draft to 48.0 times, the precision of the 300th yarn (ie, 150th yarn) is the same as in Example 1. Spinning twisted yarn was spun. The distance between the two fiber bundles when the fiber bundles 21a and 21b were supplied to the fiber bundle concentrating device 5 was 12 mm as in the first embodiment, and the nip point distance in the delivery roller 8 was 3 mm.
(Comparative Example 2)
The roving used in Example 1 was spun as a 300-twisted fine spinning twisted yarn by a known method.
(Comparative Example 3)
Example except that the position of the trumpet 1a, 1b is adjusted so that the distance between the yarn paths of the roving yarns 11a, 11b is 5 mm, and the suction part of the fiber bundle focusing device used in Example 1 is changed to B = 5 mm. Using the same fiber bundle bundling apparatus as in No. 1, spinning of 280 count twin yarn fine spinning and twisting yarn was tried. However, due to frequent pull-in, it was judged that further production was impossible and production was stopped. The distance between the two fiber bundles when the fiber bundles 21a and 21b were supplied to the fiber bundle concentrating device 5 was 5 mm, and the distance between the nip points in the delivery roller 8 was 4 mm.
The characteristic values in Examples and Comparative Examples are shown below.

表１に示すように、本発明により得られた精紡交撚糸は、毛羽が一般の精紡交撚糸（比較例１，２）よりも少なく、引張強さが高いことがわかる。操業性に関しても、従来の超極細番手糸（比較例１，２）と比べ操業が安定していることがわかる。本発明では、繊維束が吸引作用により収束するので、繊維束の強度が高く、このことが操業の安定性に寄与しているのである。

As shown in Table 1, it can be seen that the fine spun twisted yarn obtained according to the present invention has less fluff than general fine spun twisted yarns (Comparative Examples 1 and 2) and high tensile strength. Regarding the operability, it can be seen that the operation is more stable than the conventional super fine yarn (Comparative Examples 1 and 2). In the present invention, since the fiber bundle converges due to the suction action, the strength of the fiber bundle is high, which contributes to the stability of the operation.

  Further, as in Comparative Example 3, in a mode in which the fiber bundle concentrating device is simply attached to the spinning process of a general spinning / twisted yarn, a lot of fiber bundles are drawn and the operability is remarkably inferior.

It is a schematic perspective view which shows the principal part of an example of the ring spinning machine used for this invention. It is a top view of the fiber bundle convergence apparatus preferably used for this invention. It is a top view of the fiber bundle converging apparatus especially preferably used for this invention.

Explanation of symbols

1a, 1b Trumpet 2 Back roller 3 Middle roller 4 Front roller 4a Front top roller 5 Fiber bundle converging device 6 Ventilation apron 7 Rotating roller 8 Delivery roller 9 Suction part 11a, 11b Roving yarn 21a, 21b Fiber bundle 30 V zone α V zone angle 40 Snell wire 41 Traveler 42 Ring 50 Spinning twisted yarn A Width of suction part B Upstream end distance C of two suction parts Downstream end distance D of two suction parts Upstream ends of two suction parts The distance between the connecting line and the line connecting the downstream ends

Claims (5)

A ring spinning yarn characterized by having an average fluff index of 3 mm or more and 40 or less, and containing a semi-synthetic fiber, a regenerated fiber or a natural fiber as a material .   2. The fine spinning and twisting yarn according to claim 1, wherein the yarn is an English cotton count 120 to 180 count.   3. A fine spinning twisted yarn according to claim 1, wherein the strength utilization rate is 30% or more.   In the method for producing a spun-twisted yarn in which two fiber bundles that have passed through the draft region in parallel are twisted, the two fiber bundles are spaced from a fiber bundle converging device disposed downstream of the draft region. After being supplied at a length of 10 mm or more, a suction action is performed from a suction portion drilled in the fiber bundle converging device via a ventilation apron that is rotated along a rotating roller disposed downstream of the fiber bundle converging device. The method for producing a finely spun spun yarn comprising: receiving and subsequently niped and sent out at a nip point interval of 3 to 5 mm by the ventilated apron and a delivery roller rotating along the ventilated apron; . The suction part drilled in the fiber bundle converging device is two slit-like suction parts arranged in a substantially C shape, the lengths of the suction parts are equal, and the widths are both 1 to 3 mm. The upstream end interval of each suction part is 10 to 15 mm and the downstream end interval is 3 to 5 mm. Furthermore, the line segment connecting the upstream ends of each suction part and the line connecting the downstream ends The method according to claim 4, wherein the minute is parallel and the distance between each line segment is 15 to 25 mm.

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