JP6696004B2 - Long and short composite spun yarn, method for producing the same, and textile product containing the long and short composite spun yarn for knitting or clothing - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a long / short composite spun yarn, a method for producing the same, and a woven fabric, a knitted fabric, or a textile product for clothing containing the long / short composite spun yarn.

  Various proposals have heretofore been made for long-short composite spun yarns because they can take advantage of the advantages of filament yarns and short fibers. Patent Document 1 proposes a method in which a multifilament yarn is electrically opened and twisted with short fibers to form a long-short composite spun yarn having a uniform mixed fiber structure. Patent Document 2 proposes a long-short composite spun yarn in which a filament yarn made of a conjugate composite fiber yarn is arranged in a core portion and short fibers are arranged in a sheath portion. Patent Documents 3 to 4 propose a long-short composite spun yarn in which a multifilament false-twisted yarn is arranged in the core portion and a short fiber bundle is arranged in the sheath portion.

JP2012-102445A JP, 2005-045112, A JP-A-11-217736 JP, 11-061558, A

  However, in the conventional technique, it was difficult to disperse the constituent fibers of the multifilament yarn and uniformly mix the constituent fibers of the short fiber bundle. For example, in the invention of Patent Document 1, the multifilament yarn is opened by static electricity, but both sides of the opened portion are converging portions and cannot be opened continuously in the length direction of the multifilament yarn. There was a problem that a uniform portion was generated. Also in the inventions of Patent Documents 2 to 4, it is insufficient to open the multifilament yarn and integrate it with the short fiber bundle, and further improvement has been demanded.

  In order to solve the above conventional problems, the present invention provides a long / short composite spun yarn in which multifilament yarns are dispersed and uniformly mixed into a short fiber bundle.

The long-short composite spun yarn of the present invention is a long-short composite spun yarn composed of a multi-filament yarn and a short fiber bundle, wherein the multi-filament yarn is a false twist crimped yarn, and the multi-filament yarn is substantially in a state of non-twisted, and a spun yarn wherein is short fiber bundles and truly twisted in opening state, the number of twists of the multifilament yarn is substantially the same as the long and short composite yarn, the Mu It is characterized in that the constituent fibers of the twisted multifilament yarn and the constituent fibers of the short fiber bundle are dispersed in each other, and the state is continuous in the longitudinal direction.

The method for producing a long / short composite spun yarn of the present invention is the method for producing a long / short composite spun yarn, which comprises supplying a short fiber bundle to a draft zone of a spinning machine and substantially upstream of a front roller of the spinning machine. The untwisted multifilament yarn is supplied in an opened state without electric opening, and the multifilament yarn in the opened state is superposed on the drafted short fiber bundle on the nip line of the front roller, Then, a real twist is added.

  The woven or knitted fabric of the present invention is characterized by containing the long-short composite spun yarn. The textile product for clothing of the present invention is characterized in that the woven or knitted fabric is used as the textile product for clothing.

In the present invention, the multifilament yarn is twisted with the short fiber bundle in a substantially untwisted state, so that the number of twists of the multifilament yarn is substantially the same as that of the long-short composite spun yarn. The constituent fibers of the yarn and the constituent fibers of the short fiber bundle are in a state of being dispersed with each other, and by the state being continuous in the length direction, the constituent fibers of the multifilament yarn are dispersed to form a short fiber bundle. A long-short composite spun yarn uniformly mixed with fibers (short fibers) can be provided.
When the constituent fibers of the multifilament yarn are dispersed and uniformly mixed with the constituent fibers of the short fiber bundle (short fibers), there can be obtained a high-quality long-short composite spun yarn without dyeing spots and appearance streaks. .. When the multifilament yarn is a crimped yarn or a latent crimped yarn, crimp is likely to be developed, and a long and short composite spun yarn, a woven fabric, a knitted fabric, or a textile product for clothing having a swelling feeling is obtained. In the method for producing a long / short composite spun yarn of the present invention, the constituent fibers of the multifilament yarn are efficiently dispersed by integrating the untwisted multifilament yarn with the short fiber bundle in an opened state. It is possible to provide a long-short composite spun yarn that is uniformly mixed with the constituent fibers (short fibers) of the fiber bundle.

FIG. 1 is a schematic sectional view of a long-short composite spun yarn according to an embodiment of the present invention. FIG. 2 is a perspective view showing an essential part of a ring spinning machine for producing a long-short composite spun yarn. FIG. 3 is a schematic explanatory view of the essential parts of the front roller of the ring spinning machine. FIG. 4A is a schematic explanatory view of an apparatus for producing a false twist textured yarn used as a multifilament yarn in the present invention, FIG. 4B is a side view showing a processed state of the multifilament yarn, and FIG. 4C is a constituent fiber of the multifilament yarn. It is a side view showing the processing state of. FIG. 5 is a schematic process drawing of an example of a conventional method for producing a false-twist textured yarn. 6A-B is a schematic cross-sectional view of a long-short composite spun yarn obtained by electrically opening a conventional multifilament yarn and twisting it with a short fiber bundle. FIG. 6A is the dispersion portion of the multifilament yarn, and FIG. 6B is the same. The converging part is shown.

  The long-short composite spun yarn of the present invention comprises a multi-filament yarn and a short fiber bundle. The long-short composite spun yarn is also called a long-short fine spinning yarn.

The multifilament yarn used in the present invention is substantially non-twisted, and the number of twists of the multifilament yarn in the long-short composite spun yarn is substantially the same as that of the long-short composite spun yarn. The term "substantially untwisted" as used herein means the number of twists of 0 to 1 turn / m, and the number of twists of the multifilament yarn is substantially the same as that of the long-short composite spun yarn, that is, the number of twisted multifilament yarns. The difference between the twist number and the twist number of the long-short composite spun yarn is within a range of 0 to 1 turn / m. Usually, even if only the untwisted twist from the wound body is performed, the twist of 3 to 5 times / m is added. Untwisted twist refers to twist that is added when a yarn is taken out from a wound body. In order to make it substantially untwisted, for example, the following measures are necessary.
(1) Spinning-To wind a yarn after drawing, the wound body is arranged horizontally (the axis of the wound body is horizontal), and the yarn path is orthogonal to the axis of the wound body (transverse winding). take). Since the winding of the yarn after drawing is relatively fast (several hundreds of meters to tens of thousands of meters / minute), the transverse winding is effective.
(2) In the false twisting process, the yarn rewinding process, the yarn supplying process, etc., the transverse winding is preferable. For taking out the yarn and winding the yarn, the wound body is rotated in accordance with the yarn speed. As another method, the yarn is taken out from the wound body in the same direction as the longitudinal direction of the axis of the wound body, and the wound body is rotated in the direction in which the twist does not enter according to the take-out speed of the yarn. Do the same for winding the thread.

  In the long-short composite spun yarn, the constituent fibers of the non-twisted multifilament yarn and the constituent fibers of the short fiber bundle exist in a mutually dispersed state, and the dispersed state is continuous in the length direction. The term “dispersion” means that multifilament yarns may be dispersed in a plurality of constituent fiber units in any cross section orthogonal to the longitudinal direction of the long-short composite spun yarn, or may be dispersed for each constituent fiber. It may be a combination of these. In other words, in any cross section orthogonal to the longitudinal direction of the long-short composite spun yarn, a plurality of constituent fibers constituting the multifilament yarn may be divided and arranged in a plurality of constituent fiber bundles with respect to the short fiber bundle. The constituent fibers may be dispersed and arranged, or a combination thereof. Thereby, a long-short composite spun yarn in which long fibers and short fibers are uniformly mixed can be provided.

[Multifilament yarn]
The multifilament yarn is preferably at least one selected from crimped yarn and latent crimped yarn. The use of crimped yarns and latent crimped yarns and other crimped yarns as the multifilament yarns makes it possible to obtain soft, bulging yarns, woven fabrics, knitted fabrics, and textile products for clothing.

  The multifilament yarn may be raw yarn, but it is at least one selected from false twist crimped yarn, indented crimped yarn, gear crimped yarn, knit denit crimped yarn, and latent crimped yarn including composite fibers. Preferably. Among them, the false twist crimped yarn is also called a woolly processed yarn, and has the softness and swelling feeling like wool. Therefore, when the wooly yarn and wool are combined, they have synergistically superior softness and swelling feeling.

  The number of twists of the multifilament yarn before twisting is 0 to 1 turn / m, and the difference between the number of twists of the multifilament yarn after twisting and the number of twists of the long-short composite spun yarn is 0 to 1 turn / m. Is preferred. Thereby, a long-short composite spun yarn in which long fibers and short fibers are uniformly mixed can be provided.

  When the long-short composite spun yarn is 100% by mass, the mass ratio of the multifilament yarn is 5 to 80% by mass and the short fiber is 95 to 20% by mass. More preferably, the multifilament yarn is 10 to 60% by mass, the short fiber is 90 to 40% by mass, more preferably the multifilament yarn is 10% by mass or more and less than 50% by mass, and the short fiber is more than 50% by mass and 90% by mass or less. Preferably. When the short fiber bundle is rich in this way, it is easy to take advantage of the short fiber bundle.

  The constituent fibers of the short fiber bundle (also referred to as “short fibers”) may be synthetic fibers, regenerated fibers or natural fibers, but are preferably animal hair fibers, or animal hair fibers and polyester fibers, or animal hair fibers and nylon. These are fibers, animal hair fibers and cellulose acetate fibers, animal hair fibers and cupra fibers, or animal hair fibers and silk fibers. Since the long-short composite spun yarn contains animal hair fibers, it is easy to take advantage of the warm properties of animal hair fibers. Animal hair fibers are wool fibers such as wool, cashmere, mohair and camel. Wool is particularly useful, but wool mixed with cashmere and mohair is light and lustrous and is a high-class material. The fiber length of the short fibers is preferably 20 to 200 mm, more preferably 30 to 180 mm.

  The multifilament yarn is preferably at least one fiber selected from polyester fiber yarn, nylon fiber yarn, cellulose acetate fiber yarn, cupra fiber yarn and silk fiber yarn. When these yarns are combined with animal hair fibers, they become higher value-added twisted yarns. Among them, polyethylene terephthalate multifilament yarn has high strength and elasticity, and it becomes a woolly textured yarn with a feeling of swelling by false twisting. Further, in the conjugate yarn (composite yarn) of polyethylene terephthalate and polybutylene terephthalate, the original yarn is straight, but when heated, it becomes a crimped yarn. The multifilament crimped yarn is preferably free of oil. Without the oil agent, the multifilament yarn is easily opened, and the constituent fibers of the multifilament yarn are more easily dispersed in the long-short composite spun yarn. In order to make the multifilament yarn oil-free, there is a method of applying a spinning oil agent and thermally decomposing the spinning oil agent during false twisting, or a method of removing the spinning oil agent by washing.

  The long-short composite spun yarn is preferably a ring spun yarn. The ring spun yarn is spun by adding actual twist using a ring spinning machine.

In the case of ring spun yarn, the twist coefficient K of the long-short composite spun yarn is preferably 70 to 200. A more preferable twist coefficient K is 75 to 190, and 80 to 180 is even more preferable. When the twisting coefficient K of the single yarn spun by the ring spinning machine is within the above range, a more preferable characteristic, that is, a sharpness is suppressed, and a long and short composite spun yarn having a fluffy soft texture like an ordinary wool spun yarn is obtained. Become. This yarn is useful as a knit yarn or a jersey yarn as it is. The twist coefficient K is calculated by the following equation (1).
K = T / (10,000 / D) ^1/2 ... Formula (1)
T: Number of twists per 1 m D: Fineness (decitex) of long-short composite spun yarn

  The method for producing a long-short composite spun yarn of the present invention is a state in which a short fiber bundle is supplied to a draft zone of a spinning machine, and a substantially non-twisted multifilament yarn is opened on the upstream side of a front roller of the spinning machine. The multifilament yarn in the opened state is superposed on the drafted short fiber bundle on the nip line of the front roller of the spinning machine, and then the actual twist is added. The actual strength is maintained by yarn twisting.

  The overfeed rate of the multifilament yarn with respect to the surface speed of the front roller is preferably 0.5 to 5%, more preferably 1 to 4%. Within the above range, the untwisted multifilament yarn is easy to open.

  The long-short composite spun yarn of the present invention preferably has a single yarn fineness of 58.8 to 556 decitex (18 to 170 meters number single yarn single yarn, indicated as 1/18 to 1/170), and more preferably 64.5 to 333. .3 decitex (30 to 155 meter count single yarn, indicated as 1/30 to 1/155). The preferred fineness of the twin yarn is 117.6 to 1112 decitex (indicated as 2/18 to 2/170).

  In the present invention, the dimensional change in both the vertical and horizontal directions by the method specified in JIS L1096 (C method) is preferably 2.0% or less, more preferably 1.0% or less, and further preferably 0.8% or less. is there. The reason for the small dimensional change is that the long-short composite spun yarn of the present invention has the constituent fibers of the multifilament yarn dispersed and uniformly mixed with the constituent fibers of the short fiber bundle, and the movement of the constituent fibers of the short fiber bundle. It is presumed that it is constraining. Therefore, even if the constituent fibers of the short fiber bundle are fibers such as wool that tend to shrink, good dimensional stability is exhibited.

  Hereinafter, description will be given with reference to the drawings. In the drawings, the same reference numerals indicate the same items. FIG. 1 is a schematic cross-sectional view of a long-short composite spun yarn 20 according to an embodiment of the present invention. In the long-short composite spun yarn 20, a constituent fiber 22 of a non-twisted multifilament yarn and a constituent fiber (short fiber) 21 of a short fiber bundle are integrally twisted, and the constituent fiber 22 of the multifilament yarn becomes a short fiber bundle. It is in a dispersed state and continuous in the length direction.

  FIG. 2 is a perspective view showing an essential part of a ring spinning machine for producing a long-short composite spun yarn. A front bottom roller 4 is provided for each weight on a front bottom main shaft 3 that is positively rotated. The front top roller 5 is placed on the front bottom roller 4. The front top roller 5 is covered with a rubber cot and externally fitted onto a common arbor 6 under load so as to be independently rollable. The short fiber bundle 15 pulled out from the roving bobbin 1 is supplied from the guide bar to the back roller 8 via the trumpet feeder 7. The short fiber bundle 15 delivered from the back roller 8 and drafted by the draft apron 9 is nipped between the front bottom roller 4 and the front top roller 5 and spun.

  On the other hand, the multifilament yarn 16 drawn out from the thread winding body (pan) 2 passes through the nip roller (supply roller) 19, passes through the yarn guide 14 in a state of 0.5-5% overfeed, and passes through the front top roller 5. It is supplied to the upstream side, superposed with the short fiber bundle on the nip line which is the contact line between the front bottom roller 4 and the front top roller 5, and then the actual twist is added. The true twist is applied by passing the yarn through the snell wire 10 and the anti-node ring 11 and winding the yarn through the traveler 12 to the yarn tube 13 on the weight. The obtained long / short composite spun yarn 20 is wound around the yarn tube 13. The first important point here is to rotate the wound body (pan) 2 and keep the multifilament yarn 16 in a non-twisted state. The important second point is to keep the overfeed rate of 0.5 to 5% in the area from the nip roller (supply roller) 19 to the nip line which is the contact line between the front bottom roller 4 and the front top roller 5. .. As a result, the multifilament yarn 16 can be untwisted and opened to be twisted with the short fiber bundle 15.

  FIG. 3 is an explanatory view seen from above the front top roller 5 when the short fiber bundle and the multifilament yarn are twisted together. On the nip line 17 that is a contact line between the front bottom roller and the front top roller 5, the short fiber bundle and the untwisted and opened multifilament yarn are combined to form the short fiber bundle constituent fibers (short fibers) 21 and multi fibers. After the constituent fibers 22 of the filament yarn have passed through the nip line 17, twist is added to form the long-short composite spun yarn 20. The untwisted and opened multifilament yarns are combined in parallel with the short fiber bundle.

FIG. 4A is a schematic explanatory view of a false twisting apparatus 30 used in the present invention. First, an untwisted multifilament yarn original thread winding body 31 and a false twist processed yarn winding body 37 are arranged sideways (in such a manner that the longitudinal direction of the axis of each winding body is horizontal) and parallel to each other. Then, the untwisted state is maintained by supplying and winding the yarn. The raw yarn (supply yarn) 32a supplied from the raw yarn winding body 31 is heat-processed in a twisted state by the heater 34 and the twister 35 between the nip rollers 33 and 36. The twister 35 may be a spindle or an external contact type false twisting device. The yarn exiting the twister 35 is untwisted, returns to a non-twisted state, and is wound by the wound body 37. 32b is the form of the yarn in the false twisting and twisting region, and 32c is the form of the false twisting and untwisting region and the processed yarn. FIG. 4B is a side view showing a processed state of the multifilament yarn, and FIG. 4C is a side view showing a processed state of constituent fibers of the multifilament yarn. In FIG. 4C, 32 a ′ is a constituent fiber of the raw yarn supplied from the raw yarn winding body 31, 32 b ′ is a constituent fiber of the yarn in the false twisting and twisting region, and 32 c ′ is a false twisting untwisted region and the processed yarn. It is a constituent fiber. In the case of polyethylene terephthalate multifilament yarn, the temperature of the heater 34 is 120 to 250 ° C. as an example, and the false twist number by the twister 35 is in the following range as an example.
12000 / D _f ^1/2 ≤T _k ≤32000 / D _f ^1/2
T _k : Number of false twists per 1 m D _f : Fineness of multifilament yarn (decitex)

  FIG. 5 is a schematic process drawing of an example manufacturing method of a conventional false twist textured yarn. The difference from FIG. 4 is that the raw yarn winding body 38 is fixed and arranged in the vertical direction (the longitudinal direction of the axis of the winding body 38 is the vertical direction), and the untwisted yarn is applied to the supplied yarn. With this, the untwisted state cannot be maintained.

  FIGS. 6A and 6B are schematic cross-sectional views of a long-short composite spun yarn 23 in which a conventional multifilament yarn is electrically opened and twisted with a short fiber bundle, and in FIG. 6A, the long-short composite spun yarn 23 is a multifilament yarn. Although the constituent fibers 25 are dispersed in plural, in FIG. 6B, the constituent fibers 25 of the multifilament yarn are converged at one place. In electric opening, the multifilament yarn is opened by static electricity, but both sides in the longitudinal direction of the opened portion are convergent parts, and continuous opening in the length direction is impossible, resulting in nonuniform parts. Will end up. Even when the untwisted twist is added as shown in FIG. 5, the twisted portion becomes a converging portion as shown in FIG. 6B.

Next, the cloth of the present invention will be described. The fabric of the present invention is a woven or knitted fabric containing the long-short composite spun yarn. When the entire cloth is 100% by mass, the long-short composite spun yarn is preferably 10 to 100% by mass. When the short fibers used for the long-short composite spun yarn are animal hair fibers (for example, wool), the soft fibers and warmth can be exhibited with the mass ratio of the short fibers being about 5 mass% of the entire fabric, and good wearing comfort can be obtained. can get. The cloth can be widely used for general textiles and knitting. The woven fabric includes any structure such as plain weave, twill weave, and satin weave. The knit includes any structure such as a vertical knit, a horizontal knit, and a double-sided knit. The preferred basis weight of the woven or knitted fabric is 100 to 300 g / m ² . Dyeing may be carried out at any stage such as cotton, thread, cloth (woven or knitted), and a usual method can be adopted as a dyeing method.

  The fabric of the present invention is sewn into a textile product for clothing. Examples of textile products for clothing include suits, uniforms, school uniforms, workwear, sports clothing, shirts, innerwear, and socks. These textile products for clothing are suitable for wearing for three seasons from autumn to spring.

Hereinafter, the present invention will be described more specifically with reference to examples. The measuring method of each parameter in Examples and Comparative Examples of the present invention was as described below and in Table 1.
(1) Tensile elongation of yarn It was measured according to JIS L1095 9.5.1 method.
(2) Fabric strength Measured according to JIS L 1096A method.
(3) Other physical properties Measured according to JIS or industry standards.

(Example 1)
(1) Production of long-short composite spun yarn A long-short composite spun yarn was produced by the method described with reference to FIGS. As the short fiber bundle 15, 4.0-meter count (2,500 decitex) of merino type wool roving was supplied and drafted 17.5 times in the draft zone of the spinning machine. The multifilament yarn 16 is an untwisted polyethylene terephthalate (PET) multifilament false twisted yarn (total fineness: 84 decitex, number of filaments: 24, manufactured by the method shown in FIG. 4) with an overfeed of 2.5% and upstream of the front roller. Supplied to. Then, a non-twisted PET multi-filament false twisted yarn was superposed on a wool fiber bundle drafted on the nip line of the front roller, and then actual twist was added to produce a long-short composite spun yarn. The long-short composite spun yarn obtained was a 44-meter count single yarn (indicated as 1/44, fineness 227.3decitex), twist coefficient K = 166Z twist, strength 410cN / 227.3 decitex, elongation 29.4%.
(2) Fabric Fabrication The long-short composite spun yarn was used as a warp yarn and a weft yarn, respectively, to fabricate a fabric having a 2/2 twill structure. The physical properties of the obtained woven fabric are summarized in Table 1.

(Comparative Example 1)
A long-short composite spun yarn of Comparative Example 1 was obtained in the same manner as in Example 1 except that a PET multifilament false twisted yarn having a twist number of 5 times / m was used in place of the untwisted PET multifilament false twisted yarn. It was The obtained long-short composite spun yarn was used as a warp and a weft, respectively, to fabricate a woven fabric having a 2/2 twill structure. The physical properties of the obtained woven fabric are summarized in Table 1.

(Example 2)
50% by mass of wool, 50% by mass of untwisted PET multifilament false-twisted yarn, 52-meter-count twin yarn (indicated as 2/52, fineness 384.6decitex), 2/2 twill structure, except for those shown in Table 1, It carried out like Example 1. The results are shown in Table 1.

(Comparative example 2)
A PET multifilament false twisted yarn having a twist number of 5 times / m was used in place of the untwisted PET multifilament false twisted yarn, and the operations were performed in the same manner as in Example 2 except that shown in Table 1. The results are shown in Table 1.

Each of the examples of the present invention is a long-short composite spun yarn in which the constituent fibers of the multifilament yarn are dispersed and uniformly mixed with the constituent fibers of the short fiber bundle, and there are no dyeing spots, no appearance streaks, and a high-quality long-short composite yarn. It could be spun yarn. On the other hand, in each of the comparative examples, the dispersibility of the constituent fibers of the multifilament yarn in the short fiber bundle was inferior to that of each example product, and stains and appearance streaks were observed.
In comparison between the woven fabric of Example 1 and the woven fabric of Comparative Example 1, the woven fabric of Example 1 is superior in abrasion strength and dimensional stability (dimensional change and washing dimensional change), and the woven fabric of Example 2 is better. In comparison with the woven fabric of Comparative Example 2, the woven fabric of Example 2 was superior in dimensional stability (change in washing size). Further, when the multifilament yarn is a crimped yarn or a latent crimped yarn, crimping is likely to occur, and a soft, bulging yarn, a woven fabric, a knitted fabric, and a textile product for clothing are obtained.

  The long-short composite spun yarn of the present invention is excellent in washability including home washing, strength, durability, dimensional stability, etc., and is suitable for school uniforms, uniforms, suits, work clothes, sports clothes, shirts, underwear, etc. is there.

1 Coarse Thread Bobbin 2 Pane 3 Front Bottom Main Shaft 4 Front Bottom Roller 5 Front Top Roller 5 Front Top Roller 6 Arbor 7 Trumpet Feeder 8 Back Roller 9 Draft Apron 10 Snell Wire 11 Anti-node Ring 12 Traveler 13 Thread Tube 14 Yarn Guide 15 Short Fiber Bundle 16 Multi Filament yarn 17 Nip line 18 Direction of rotation of multifilament wound body 19 Nip rollers 20,23 Long and short composite spun yarn 21,24 Short fiber bundle constituent fibers 22,25 Multifilament constituent fiber 30 False twisting machine 31,38 Raw yarn winding Thread body 32a Raw thread (supply thread)
32b Thread in false twisting / twisting area 32c Threads in false twisting / untwisting area and after processing 33, 36 Nip roller 34 Heater 35 Twister 37 Winding body of false twisted thread

Claims (10)

A long-short composite spun yarn composed of a multi-filament yarn and a short fiber bundle,
The multifilament yarn is a false twist crimped yarn,
In the state of the multifilament yarn is substantially untwisted, and a spun yarn wherein is short fiber bundles and truly twisted in opening state, the twist number of the multi-filament yarn is substantially the long and short composite yarn Is the same as
A long-short composite spun yarn characterized in that the constituent fibers of the non-twisted multifilament yarn and the constituent fibers of the short fiber bundle are dispersed in each other and the state is continuous in the longitudinal direction.   The twist number of the multifilament yarn before twisting is 0 to 1 turn / m, and the difference between the twist number of the multifilament yarn after twisting and the twist number of the long-short composite spun yarn is 0 to 1 turn / m. The long-short composite spun yarn according to claim 1.   The long-short composite spun yarn according to claim 1 or 2, wherein the multi-filament yarn has a mass ratio of 15 to 80 mass% and the short fiber bundle has a mass ratio of 85 to 20 mass% when the long-short composite spun yarn is 100 mass%. ..   The constituent fibers of the short fiber bundle are animal hair fibers, or animal hair fibers and polyester fibers, animal hair fibers and nylon fibers, animal hair fibers and cellulose acetate fibers, animal hair fibers and cupra fibers or animal hair fibers and silk fibers. The long-short composite spun yarn according to any one of claims 1 to 3, which is a mixed spun yarn.   The multifilament yarn is at least one fiber yarn selected from polyester fiber yarn, nylon fiber yarn, cellulose acetate fiber yarn, cupra fiber yarn, and silk fiber yarn, according to any one of claims 1 to 4. Long and short composite spun yarn.   The long / short composite spun yarn according to any one of claims 1 to 5, wherein the long / short composite spun yarn is a ring spun yarn. A method for producing the long-short composite spun yarn according to any one of claims 1 to 6,
Supply short fiber bundles to the draft zone of the spinning machine,
Supplying a substantially non-twisted multifilament yarn in an opened state without electric opening to the upstream side of the front roller of the spinning machine,
A method for producing a long-short composite spun yarn, comprising superposing the opened multifilament yarn on the drafted short fiber bundle on the nip line of the front roller, and then applying actual twist.   The method for producing a long-short composite spun yarn according to claim 7, wherein the overfeed rate of the multifilament yarn with respect to the surface speed of the front roller is 0.5 to 5%.   A woven or knitted fabric containing the long-short composite spun yarn according to any one of claims 1 to 6.   A textile product for clothing, comprising the woven or knitted fabric according to claim 9.

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