JP4431083B2 - Compound twisted yarn - Google Patents

Description

  The present invention relates to a composite twisted yarn and a woven or knitted fabric manufactured using the composite twisted yarn. More specifically, the present invention relates to a composite twisted yarn obtained by twisting two or more spun yarns and a water-soluble yarn, and a woven or knitted fabric obtained by dissolving and removing a water-soluble yarn from water in a woven or knitted fabric produced from the composite twisted yarn.

  In knitted and knitted fabrics using spun yarns, composite yarns combining spun yarns and polyurethane elastic yarns are widely used to impart stretchability to the woven or knitted fabrics. Typical examples are core spun yarn in which the core yarn made of polyurethane elastic yarn is covered with spinning cotton and twisted, and the spun yarn is wound around the core yarn made of polyurethane elastic yarn as a single layer or multiple layers There are single-covered yarn and double-covered yarn wound around two yarns, and pliers in which two or more spun yarns and polyurethane elastic yarns are twisted together, and it is a common practice to produce elastic knitted fabrics using these composite yarns. ing.

  However, since the above-mentioned conventional composite yarn uses a polyurethane elastic yarn having a large stretchability, a special device and a high technique are required at the time of handling the yarn and weaving. In addition, since polyurethane elastic yarns are likely to deteriorate over time due to heat, light, etc., composite yarns using polyurethane elastic yarns and woven or knitted fabrics made from such yarns tend to lose their elasticity. Furthermore, the woven or knitted fabric produced using the polyurethane composite yarn often lacks flexibility, plump texture, lightness and the like.

  From the above point, a method for producing a stretchable woolen knitted fabric without using a polyurethane elastic yarn has been proposed (see Patent Document 1). In the method of Patent Document 1, a woven or knitted fabric is formed from a mixed spun yarn composed of wool fibers and water-soluble polyvinyl alcohol fibers, and the woven or knitted fabric is immersed in water and heated with stirring to shrink the water-soluble polyvinyl alcohol fibers. Then, the water-soluble polyvinyl alcohol fiber is dissolved and removed to make a woven or knitted fabric only of wool fiber, and the woven or knitted fabric is set to produce a stretchable wool knitted or knitted fabric. However, the mixed spun yarn made of wool fiber and water-soluble polyvinyl alcohol fiber used in this method does not have sufficient yarn strength, and troubles such as yarn breakage occur when knitting and weaving using a high-speed loom or knitting machine. Is likely to occur. In addition, a stretchable woolen knitted fabric obtained by removing water-soluble polyvinyl alcohol fibers from a woven or knitted fabric formed from the mixed spun yarn is not yet sufficiently stretchable and lacks strength and the like. Further, when this method is carried out using other fibers such as cotton and synthetic fibers instead of wool, it is difficult to obtain a stretchable woven or knitted fabric.

  In addition, for the purpose of improving the knitting and weaving properties of cashmere yarn and smoothly producing cashmere woven or knitted fabric, a composite yarn is obtained by combining cashmere yarn and yarn soluble in a weakly acidic aqueous solution. A method for producing a woven or knitted fabric of 100% cashmere by producing a woven or knitted fabric by weaving and knitting, and dissolving and removing the weak acid-soluble yarn from the woven or knitted fabric with an acid (see Patent Document 2). . However, the 100% cashmere knitted or knitted fabric obtained by this method is still not sufficiently stretchable, and one of the yarns is removed by an acid, so that the remaining yarn is likely to deteriorate.

JP-A-11-241269 European Patent No. 1061162B1

An object of the present invention is to provide a composite yarn that can obtain a woven or knitted fabric having high stretchability without using a polyurethane elastic yarn and having excellent properties such as lightness, flexibility, and texture. It is.
Furthermore, the object of the present invention is that the occurrence of troubles such as yarn breakage does not occur even when a high-speed loom or knitting machine is used, and it is excellent in knitting and weaving, natural fiber spun yarn, synthetic fiber spun yarn, Various kinds of spun yarns such as semi-synthetic fiber spun yarns can be used, it is possible to respond to small lots and many types with high productivity, and it is possible to obtain composite yarns of any thickness from fine counts to thick counts. It is an object of the present invention to provide a composite yarn that does not use a polyurethane elastic yarn, which is useful in the production of a woven or knitted fabric.
An object of the present invention is a fiber from a spun yarn that is formed from the above-described composite yarn, has high stretchability, is excellent in properties such as lightness, texture, and flexibility, and constitutes a woven or knitted fabric. It is an object of the present invention to provide a woven or knitted fabric not using polyurethane elastic yarns, which is excellent in strength and has no looseness.

  The present inventors have intensively studied to achieve the above-described object. Then, using one spun yarn and a water-soluble yarn, both are twisted in a twist direction opposite to the twist direction of the spun yarn to produce a composite twisted yarn, and a woven or knitted fabric is produced from the composite twisted yarn. The water-soluble yarn in the woven or knitted fabric was dissolved and removed in water. As a result, although the polyurethane elastic yarn is not used, the spun yarn has a longer length than the water-soluble yarn. A gap is created where the yarn has melted, and a force to shrink the yarn further to fill the gap, giving high stretchability, and being plump and having a good feel and texture, light weight, A woven or knitted fabric having excellent properties such as air permeability could be obtained.

  Therefore, the present inventors have continued further research based on the composite twisted yarn and the woven / knitted fabric obtained above. Then, instead of using one spun yarn, two or more spun yarns are used, and the two or more spun yarns and the water-soluble yarn are twisted in a direction opposite to the twisted direction of the spun yarn. Was newly produced, and a woven or knitted fabric was made using this composite twisted yarn, and an experiment was conducted in which water-soluble yarn in the woven or knitted fabric was dissolved and removed with water. As a result, when a composite twisted yarn is manufactured with two or more spun yarns twisted together with a water-soluble yarn, the number of twists when manufacturing the composite twisted yarn is manufactured from one spun yarn and a water-soluble yarn. Even if it is less than the case where it is done, it is possible to obtain a composite twisted yarn excellent in handleability and strength at the time of weaving and weaving, and by reducing the number of twists in producing the composite twisted yarn, It has been found that the efficiency of twisting is improved and the productivity is increased.

Furthermore, the present inventors prepared a woven or knitted fabric from a composite twisted yarn produced by twisting two or more spun yarns and a water-soluble yarn, and dissolved and removed the water-soluble yarn contained in the woven or knitted fabric with water. In the resulting woven or knitted fabric, although the number of twists when producing the composite twisted yarn is small, in the finally obtained woven or knitted fabric, the fiber does not come off from the spun yarn, and the strength of the yarn, and consequently the woven or knitted fabric It was found that the strength of is maintained well. In addition, the woven or knitted fabric obtained by dissolving and removing the water-soluble yarn is highly stretchable and plump, as is the case with the woven or knitted fabric obtained by twisting a single spun yarn and a water-soluble yarn. It has been found that it has a good feel and feel and is excellent in properties such as lightness and breathability.
Further, the present inventors have made a composite twisted yarn obtained by twisting two or more spun yarns and a water-soluble yarn, and the types of the two or more spun yarns constituting the composite twisted yarn (for example, the type of fiber material, spinning By changing the thickness of the yarn, other physical properties, etc.), the woven or knitted fabric obtained by dissolving and removing the water-soluble yarn in the woven or knitted fabric produced from the composite twisted yarn has the above-mentioned high stretchability, fluffy feel and wind. In other words, it has been found that various characteristics and appearances can be exhibited together with characteristics such as lightness and air permeability, and the present invention has been completed based on these various findings.

That is, the present invention
(1) (i) A composite twisted yarn obtained by twisting two or more spun yarns having the same twist direction and a water-soluble yarn;
(Ii) the twist direction of the composite twist yarn is opposite to the twist direction of the spun yarn;
(Iii) the number of twists of the composite twisted yarn is in the range of 0.3 to 2 times the number of twists of each of the two or more spun yarns; and
(Iv) based on the mass of the composite twisted yarn, the proportion of spun yarn is 98-40 mass and the proportion of water-soluble yarn is 2-60 mass%;
This is a composite twisted yarn.
And this invention,
(2) The composite twisted yarn of (1), wherein the water-soluble yarn is a water-soluble filament yarn.

Furthermore, the present invention provides
(3) A woven or knitted fabric obtained by dissolving and removing water-soluble yarn in the composite twisted yarn with water from the woven or knitted fabric containing the composite twisted yarn of (1) or (2); and
(4) The woven or knitted fabric according to (3), wherein the water-soluble yarn in the composite twisted yarn is dissolved and removed from the woven or knitted fabric containing the composite twisted yarn of (1) or (2) at a ratio of 10% by mass or more;
It is.

The composite twisted yarn of the present invention is high by preparing a woven or knitted fabric from the composite twisted yarn, even though no polyurethane elastic yarn is used, and dissolving and removing the water-soluble yarn in the woven or knitted fabric in water. A knitted or knitted fabric that has stretchability, is plump, has a good touch and feel, and is excellent in properties such as lightness and breathability can be obtained.
In the composite twisted yarn of the present invention, various spun yarns such as spun yarns made of wool fibers as well as spun yarns made of other natural fibers, spun yarns made of synthetic fibers, spun yarns made of semi-synthetic fibers, etc. Can be used.
The composite twisted yarn of the present invention in which two or more spun yarns are twisted together with a water-soluble yarn with a specific twist number in the direction opposite to the twist direction of the spun yarn. Compared to a composite twisted yarn twisted with a yarn, the composite twisted yarn has excellent strength and handling at the time of weaving and weaving. Moreover, since the composite twisted yarn of the present invention can reduce the number of twists, it is possible to efficiently perform the twisted yarn when producing the composite twisted yarn, and to improve the productivity.

The composite twisted yarn of the present invention has less fuzz due to the presence of the water-soluble yarn in the yarn, and the water-soluble yarn plays a reinforcing role. In addition, the strength is excellent in that two or more spun yarns are used. Therefore, the composite twisted yarn of the present invention has a high woven or knitted fabric without using a high-speed loom or knitting machine, without causing trouble such as yarn breakage, and even without performing a gluing process during warping. It can be manufactured smoothly with productivity.
The composite twisted yarn of the present invention can be manufactured using any spun yarn from fine count to thick count, and the final water-soluble product can be obtained by selecting the type or combination of spun yarn used in two or more. A variety of properties, texture, appearance, and the like can be exhibited in the woven or knitted fabric after dissolving and removing the sex yarn.
Since the composite twisted yarn and stretchable woven or knitted fabric of the present invention do not contain polyurethane elastic yarn, there is no deterioration over time due to heat, light, etc. due to the use of polyurethane elastic yarn.

The woven or knitted fabric of the present invention obtained by treating the woven or knitted fabric containing the composite twisted yarn of the present invention with water and dissolving and removing the water-soluble yarn in the composite twisted yarn with water has a spun yarn length that is longer than that of the water-soluble yarn. Because it is long, in the woven or knitted fabric after the water-dissolving treatment, stretchability can be obtained for a long time. It has high stretchability and is excellent in appearance, feel, breathability and lightness.
Furthermore, in the woven or knitted fabric obtained by dissolving and removing the water-soluble yarn in the woven or knitted fabric produced from the composite twisted yarn of the present invention with water, two or more spun yarns are in a state of being twisted together. The fiber does not come off from the composed spun yarn and is excellent in strength and durability.
Therefore, the woven or knitted fabric of the present invention can be effectively used in a wide range of fields such as clothing use, medical use, and industrial materials, taking advantage of the above-described properties.

The present invention is described in detail below.
The composite twisted yarn of the present invention is composed of two or more spun yarns and a water-soluble yarn.
In the composite twisted yarn of the present invention, the twist direction of two or more spun yarns constituting the composite twisted yarn is the same, and the twist direction of the composite twisted yarn is opposite to the twist direction of the two or more spun yarns. It is necessary. In the composite twisted yarn of the present invention in which the twist direction of two or more spun yarns is the same, the two or more spun yarns and the water-soluble yarn are twisted in the direction opposite to the twist direction of the spun yarn. The spun yarn is partially or completely untwisted so that it is longer than the original spun yarn. Therefore, high stretchability is imparted to the woven or knitted fabric obtained by dissolving and removing the water-soluble yarn with water from the woven or knitted fabric produced using the composite twisted yarn of the present invention.

  On the other hand, when two or more spun yarns are twisted in different directions (for example, when using a total of two spun yarns, one S spun yarn and one Z twist spun yarn, S twist spun When using a total of three spun yarns of one yarn and two Z-twisted yarns, when using a total of three spun yarns of two S-twisted yarns and one Z-twisted spun yarn, etc.) Is a combination of two or more spun yarns, regardless of whether the spun yarn and water-soluble yarn for producing the composite twisted yarn are twisted together (hereinafter sometimes referred to as “upside twist”) in the S direction or the Z direction. One part of the spun yarn (spun yarn having a twist direction opposite to the top twist) is untwisted, but the remaining spun yarn (spun yarn having the same twist direction as the top twist) is more than before applying the top twist. The twist is strongly applied in the same direction. Therefore, even when a woven or knitted fabric is prepared using such a composite twisted yarn and the water-soluble yarn is dissolved and removed from the woven or knitted fabric with water, a highly stretchable woven or knitted fabric cannot be obtained, and the texture of the woven or knitted fabric is hard. In addition, lightness and air permeability are insufficient.

As long as the spun yarn constituting the composite twisted yarn of the present invention is formed from fibers that do not dissolve in water (hot water, hot water, cold water), the type of fiber forming the spun yarn is not particularly limited.
The spun yarn constituting the composite twisted yarn of the present invention includes, for example, natural fibers such as cotton, hemp, silk, and wool, polyester fibers, polyamide fibers, polypropylene fibers, acrylic fibers, water (hot water) insoluble polyvinyl alcohol fibers, A single spun yarn composed of one type of fiber selected from synthetic fibers such as polyvinylidene chloride fiber, semi-synthetic fiber such as acetate, regenerated fiber such as rayon and cupra, and a mixed spun yarn composed of two or more of the above-mentioned fibers Either may be sufficient. An appropriate spun yarn may be selected and used according to the use of the composite twisted yarn and the woven or knitted fabric produced using the same.
Two or more spun yarns constituting the composite twisted yarn of the present invention may be formed of the same fiber or may be formed of different fibers. Although not limited in any way, for example, all the two or more spun yarns may be cotton spun yarns, or all of the two or more spun yarns may be spun yarns made of the same synthetic fiber. Even if some of the two or more spun yarns are cotton spun yarns and the remaining spun yarns are wool spun yarns, synthetic fiber spun yarns and / or mixed yarns of cotton and synthetic fibers. Alternatively, some of the two or more spun yarns may be spun yarns made of a specific synthetic fiber, and the remaining spun yarns may be spun yarns made of a different synthetic fiber.

The two or more spun yarns constituting the composite twisted yarn of the present invention may be either a single yarn, a double yarn or three or more twisted yarns. For example, all of the two or more spun yarns may be single yarns, all may be twin yarns, or all may be three or more twisted yarns. Further, for example, some spun yarns of two or more spun yarns may be single yarns, and other spun yarns may be twin yarns or three or more spun yarns, or part of two or more spun yarns These spun yarns may be twin yarns and the other spun yarns may be three or more twisted yarns.
Among them, the two or more spun yarns constituting the composite twisted yarn of the present invention are all single yarns, the process can be omitted when producing the composite twisted yarn, and the freedom associated with the untwisting of the spun yarn The degree is preferable because it greatly contributes to stretchability.

The number of twists of two or more spun yarns constituting the composite twisted yarn of the present invention is not particularly limited, but when the number of twists is T (unit: times / 2.54 cm) and the cotton count is S (unit: count), K A spun yarn having a twist coefficient K of 2 to 4 represented by = T / √S is preferably used from the viewpoints of quality stability of the spun yarn, productivity at the time of producing the composite twisted yarn, availability of the spun yarn, and the like.
However, in the present invention, it is necessary to satisfy the requirement that “the number of twists of the composite twisted yarn is in the range of 0.3 to 2 times the number of twists of each of the two or more spun yarns”. Therefore, it is necessary that two or more spun yarns have a twist number satisfying the above requirements.
For example, when two spun yarns A and B are used, if the number of twists of the spun yarn A is 50 times / m and the number of twists of the spun yarn B is 500 times / m, the number of twists of the spun yarn A is 0. .3 to 2 times is 15 to 100 times / m, 0.3 to 2 times the twist number of the spun yarn B is 150 to 1000 times / m, and is 0.3 to 2 times the number of twists of the spun yarn A There is no common part (common numerical range) in the value of 0.3 to 2 times the twist number of the spun yarn B, and when the spun yarn A and spun yarn B of such a twist number are used, The number of twists of the twisted yarn (number of top twists) does not satisfy the above-mentioned requirements defined in the present invention. From this point, in the present invention, spun yarns having no common numerical value (numerical value range) when the number of twists of each spun yarn of two or more spun yarns is 0.3 to 2 times cannot be used together.

Here, the “twisted number of spun yarn” as used in the present invention refers to the number of twisted yarns applied last in the production of spun yarn. For example, when the spun yarn is a single yarn, it refers to the number of twists applied at the time of spinning to produce a single yarn, and in the case of a double yarn, when two yarns are twisted together to produce a double yarn This refers to the number of twists. In the case of three or more twisted yarns, the number of twists when three or more yarns are twisted together to produce a twisted yarn.
When the spun yarn is a twin yarn or three or more twisted yarns, the final twist direction when the twin yarn or three or more twisted yarns are manufactured is the single twisted yarn or the twisted yarn used in the production of the twin yarn or the twisted yarn. The twist direction of the yarn is opposite to that of the yarn, and the number of twists of the final twist (the number of twists of the spun yarn referred to in the present invention; the number of twists when the double yarn or the twisted yarn is manufactured) is double yarn or It is preferably 0.3 to 0.9 times the number of twists of the single yarn used for producing the twisted yarn from the viewpoints of the productivity of the twisted yarn, the handleability of the yarn, the texture, the availability of the spun yarn, and the like. .

  In addition, as the yarn count of the spun yarn, the cotton count of 5 to 200, further 5 to 140, especially 10 to 120, the processability when producing the composite twisted yarn, the acquisition of the spun yarn It is preferably used from the viewpoints of ease of use and market demand for the fabric to be produced.

  As a water-soluble yarn, a yarn that dissolves in water (hot water) under atmospheric pressure at a temperature up to the boiling temperature of water (about 100 ° C.) is water-soluble from a woven or knitted fabric produced using the composite twisted yarn of the present invention. It is preferably used from the viewpoints of ease of removal and handling when the yarn is dissolved and removed with water. In particular, as the water-soluble yarn, when the water-soluble yarn itself is immersed in water having a temperature of 80 ° C. or more and left for 30 minutes, it is 85% by mass or more, particularly with respect to the mass of the water-soluble yarn before immersion. More preferably, 95% by mass or more of a water-soluble yarn that dissolves in water (water-soluble yarn having a water-insoluble residue of less than 15% by mass, particularly less than 5% by mass). If water solubility of the water-soluble yarn is low, when the woven or knitted fabric produced using the composite twisted yarn is treated with water to dissolve and remove the water-soluble yarn in the composite twisted yarn, the removal of the water-soluble yarn becomes insufficient, It becomes difficult to impart sufficient stretchability and light weight to the woven or knitted fabric.

  Any fiber can be used as the fiber constituting the water-soluble yarn as long as it is a fiber that imparts water solubility to the water-soluble yarn. For example, water-soluble polyvinyl alcohol fiber, water-soluble ethylene-vinyl alcohol copolymer fiber And water-soluble polyamide fibers. Among them, water-soluble polyvinyl alcohol fibers and water-soluble ethylene-vinyl alcohol copolymer fibers are preferably used in terms of fiber strength, high solubility in water (hot water), biodegradability, availability, and the like. It is done. Water-soluble polyvinyl alcohol fibers have been widely known, and are sold as, for example, water-soluble vinylon. In particular, since the water-soluble polyvinyl alcohol fiber is biodegradable, the waste liquid discharged when the polyvinyl alcohol fiber is dissolved and removed from the woven or knitted fabric with water can be smoothly treated and purified by microorganisms.

  The water-soluble yarn may be either a filament yarn or a spun yarn as long as it is water-soluble. However, when the water-soluble yarn is a spun yarn, the twisting direction is the same as the twisting direction of the composite twisted yarn, which can increase the length of the water-insoluble spun yarn in the composite twisted yarn, It is preferable from the point that the stretchability of the is high. As a water-soluble yarn, it is rather possible to use a filament yarn. Even when the mixing ratio of the water-soluble yarn in the composite twisted yarn is low, the woven or knitted fabric made from the composite twisted yarn is treated with water to dissolve and remove the water-soluble yarn. The water-soluble yarn is removed quickly and satisfactorily, the yarn strength of the composite twisted yarn of the present invention is increased, the spun yarn with a fine count is easy to use, and it can be used at a low blending rate to reduce the cost. It is preferable because it can be done.

  The thickness of the water-soluble yarn is 15 to 200 dtex, particularly 25 to 100 dtex. The ease of twisting with the spun yarn, the strength of the composite twisted yarn, the reduction of the spinning fluff, and the woven or knitted fabric formed from the composite twisted yarn This is preferable from the viewpoints of ease of dissolution and removal of the water-soluble yarn, stretchability of the fabric after dissolving the water-soluble yarn, productivity of the water-soluble yarn, and the like.

  In the composite twisted yarn of the present invention, the reason why the yarn (water-soluble yarn) that dissolves in water rather than the yarn that dissolves or decomposes in alkali or acid is used as the removing yarn is that the composite twisted yarn forming a woven or knitted fabric is used. When treated with alkali or acid to remove a part of the yarn, the spun yarn constituting the composite twisted yarn may be altered or decomposed. However, when treated with water, There is no risk of decomposition. In the present invention, a water-soluble yarn that dissolves in water, not a yarn that dissolves or decomposes with an alkali or an acid, is used as a removal yarn constituting the composite twisted yarn (yarn that is removed after forming a woven or knitted fabric). Accordingly, a wide variety of spun yarns can be used as the spun yarn constituting the composite twisted yarn. That is, in the present invention, as the spun yarn constituting the composite twisted yarn, as long as it is a yarn that does not dissolve in water, even a yarn that is easily dissolved or decomposed by an alkali or acid can be used. The types of spun yarns and the range of selection can be expanded, and as a result, the types, characteristics, and textures of the woven or knitted fabric formed from the composite twisted yarn can be varied.

  Particularly when water-soluble polyvinyl alcohol fiber or water-soluble ethylene-vinyl alcohol copolymer fiber is used as the water-soluble yarn, water-soluble polyvinyl alcohol or water-soluble ethylene-vinyl alcohol copolymer fiber is used. Since it has biodegradability, the waste liquid after dissolution can be decomposed and treated with microorganisms.

The composite twisted yarn of the present invention contains 98 to 40% by mass of spun yarn (total mass of two or more spun yarns) and 2 to 60% by mass of water-soluble yarn based on the mass of the composite twisted yarn. In the composite twisted yarn of the present invention, it is preferable that the spun yarn is 95 to 50% by mass and the water-soluble yarn is 5 to 50% by mass, the spun yarn is 90 to 60% by mass and the water-soluble yarn is 10 to 40% by mass. % Is more preferable.
By setting the ratio of the spun yarn and the water-soluble yarn within the above range, a composite twisted yarn excellent in knitting and weaving property, yarn strength, twist stability, and the like can be obtained. Moreover, when the water-soluble yarn in the composite twisted yarn is dissolved and removed from the woven or knitted fabric made from the composite twisted yarn with water, the water-soluble yarn is well removed and an attempt is made to fill the gap from which the water-soluble yarn has been removed. The shrinkage force acting on the woven or knitted fabric can improve the stretchability, and at the same time, the texture, feel, lightness, breathability, etc. of the woven or knitted fabric are also improved.
If the proportion of water-soluble yarn in the composite twisted yarn is less than the above range (if the proportion of spun yarn is more than the above range), the elasticity of the woven or knitted fabric after removing the water-soluble yarn from the woven or knitted fabric produced from the composite twisted yarn , Lightness, air permeability and the like are lowered, and the texture is hard and inferior. On the other hand, when the proportion of the water-soluble yarn in the composite twisted yarn is greater than the above range (if the proportion of the spun yarn is less than the above range), the woven or knitted fabric after removing the water-soluble yarn from the woven or knitted fabric produced from the composite twisted yarn is However, it becomes inferior in form stability, and it is easy to cause blindness.

The number of spun yarns (number of yarns) constituting the composite twisted yarn of the present invention needs to be 2 or more. From the viewpoint of limiting the number of krills of the twisting machine, quality control, etc., 2 or 3 Preferably there is. Since the composite twisted yarn of the present invention is formed using two or more spun yarns, the number of twists (the number of upper twists) when producing a composite twisted yarn in the direction opposite to the twisted direction of the spun yarn is spun. A composite twisted yarn excellent in handling property and strength at the time of weaving and weaving can be produced with high twisting efficiency and high productivity while maintaining a small value of 0.3 to 2 times that of the yarn. Moreover, in the woven or knitted fabric obtained by dissolving and removing the water-soluble yarn with water from the woven or knitted fabric produced from the composite twisted yarn of the present invention, the two or more spun yarns are untwisted while being in a twisted state. In addition, it is possible to prevent the fibers forming the spun yarn from slipping out, and to maintain the strength of the spun yarn and, in turn, the strength of the woven or knitted fabric.
In addition, the number of water-soluble yarns is 1 to 3, particularly 1 to 2 in that the number of creels of the twisting machine can be reduced, and the water-soluble yarn can be dissolved and removed from the woven or knitted fabric made from the composite twisted yarn. It is preferable in terms of ease.

In the composite twisted yarn of the present invention, two or more spun yarns have the same twist direction and the twist direction of the composite twisted yarn (twist direction when twisting two or more spun yarns and a water-soluble yarn; the direction of the top twist) ) Is reverse to the twist direction of the spun yarn (hereinafter, the twist of the spun yarn is sometimes referred to as “bottom twist”). Furthermore, in the composite twisted yarn of the present invention, the number of twists of the composite twisted yarn (the number of twists of the upper twist) is in the range of 0.3 to 2 times with respect to any of the numbers of twists of two or more spun yarns. It is necessary to be within a range of 0.3 to 1.75 times, and more preferably within a range of 0.35 times or more and less than 1.3 times.
For example, in the case of producing the composite twisted yarn of the present invention by twisting (up twisting) two spun yarns of 600 times / m (Z twist) and a water-soluble yarn, the two spun yarns and the water-soluble yarn. Is twisted in the S direction at a twist number of 600 times / m × (0.3 to 2 times) = 180 to 1200 times / m to obtain the composite twisted yarn of the present invention.
Further, for example, two spun yarns having different twist numbers, that is, a spun yarn A of 500 times / m (S twist) and a spun yarn B of 800 times / m (S twist) are twisted together with a water-soluble yarn in the Z direction. When producing the composite twisted yarn of the present invention (by twisting), 500 times / m × (0.3-2 times) = 150-1000 times / m and 800 times / m × (0.3-2) Double) = Z twist in the range of 240 to 1000 times / m, which is a common numerical range of 240 to 1600 times / m, to obtain the composite twisted yarn of the present invention.

  In the present invention, two or more spun yarns and a water-soluble yarn are twisted in a direction opposite to the twist direction of the spun yarn and with a twist number in the range of 0.3 to 2 times the twist number of the spun yarn. By using a composite twisted yarn, the upper twist is the twist of the spun yarn while maintaining the shape stability (twisting stability) of the composite twisted yarn at the time of twisting (when the upper twist is performed) to produce the composite twisted yarn. It works in the direction of untwisting (primary twist), and the yarn length of the spun yarn becomes longer during the upper twist, while the water-soluble yarn is twisted and the yarn length is shortened. Even if twisting is further started from 0, the yarn is twisted in a state where the relationship of the yarn length of the spun yarn> the yarn length of the water-soluble yarn is maintained. As a result, it is possible to satisfactorily perform weaving and knitting when preparing a woven or knitted fabric from a composite twisted yarn, and when the water-soluble yarn is dissolved and removed from the woven or knitted fabric obtained by knitting or wetting, the stretchability becomes large. A woven or knitted fabric having a fluffy texture and excellent in lightness and breathability can be obtained.

When the twist number of the upper twist in the composite twisted yarn is less than 0.3 times the twist number of the lower twist (twisted number of the spun yarn), the untwisting of the spun yarn is insufficient during the twisting to produce the composite twisted yarn. In addition, since twisting of the water-soluble yarn is insufficient, the twisting process at the time of producing the composite twisted yarn is not stable, and the resulting composite twisted yarn has spots, and the composite twisted yarn is used. Even if the water-soluble yarn is dissolved and removed from the produced woven or knitted fabric with water, a stretchable woven or knitted fabric cannot be obtained. On the other hand, when the number of twists of the upper twist in the composite twisted yarn exceeds twice the number of twists of the lower twist (twisted number of the spun yarn), a twisting process for applying the upper twist (a twisting process for producing a composite twisted yarn) This causes troubles such as yarn breakage, which tends to lead to reduced productivity of composite twisted yarn, reduced strength of the obtained composite twisted yarn, process failure during weaving and knitting using composite twisted yarn, and low twisting efficiency. Thus, the productivity in producing the composite twisted yarn is reduced.
In the present specification, the “twist number of composite twisted yarn” (twist number of upper twist) is a twist number when two or more spun yarns and a water-soluble yarn are twisted together. It becomes a value according to the set twist number at the time of the process.

  There are no particular restrictions on the type of twisting machine used to produce a composite twisted yarn by twisting two or more spun yarns and water-soluble yarns. For example, a conventional general-purpose twisting machine such as a double twister, ring twister, or up twister is used. can do.

  The composite twisted yarn of the present invention may have torque, but if it does not interfere with the weaving and weaving process even if it has torque, it may be used as it is for the production of woven or knitted fabric without reducing the torque. it can. If the torque is hindered in the weaving and weaving process, heat treatment is preferably performed to reduce the torque. The heat treatment temperature at that time must be determined by the kind of spun yarn and water-soluble yarn constituting the composite twisted yarn, the torque strength of the composite twisted yarn, and the like.

By using the composite twisted yarn of the present invention, a woven or knitted fabric having high stretchability can be produced, and the type of woven or knitted fabric and the content of the structure are not particularly limited.
In the production of the woven or knitted fabric, the use ratio of the composite twisted yarn of the present invention can be adjusted according to the type and use of the woven or knitted fabric, the degree of expansion and contraction required for the woven or knitted fabric, and the like. In order to obtain a woven or knitted fabric having high stretchability, the use ratio of the composite twisted yarn of the present invention in the woven or knitted fabric before dissolving and removing the water-soluble yarn in the composite twisted yarn forming the woven or knitted fabric in water is determined. It is preferable to set it as 10 mass% or more with respect to the mass of a knitted fabric, and it is more preferable to set it as 20 mass% or more. Accordingly, when the water-soluble yarn in the composite twisted yarn forming the woven or knitted fabric is dissolved and removed by treating the woven or knitted fabric with water (hot water), a woven or knitted fabric having high stretchability can be obtained. If the ratio of the composite twisted yarn used in the woven or knitted fabric is too low, even if the water-soluble yarn in the composite twisted yarn forming the woven or knitted fabric is dissolved and removed by treating the woven or knitted fabric with water (hot water), it is stretchable. It becomes difficult to obtain a woven or knitted fabric.

The treatment of dissolving and removing the water-soluble yarn in the composite twisted yarn with water from the woven or knitted fabric produced using the composite twisted yarn of the present invention is performed before the step of dyeing the woven or knitted fabric and before the step of attaching the resin to the woven or knitted fabric. Good to do. If the water-soluble yarn constituting the composite twisted yarn is subjected to water dissolution treatment during or after the dyeing step or resin adhesion step, the dyeing step or resin adhesion step is likely to be hindered, and the water-soluble yarn is dissolved. It becomes difficult to remove sufficiently. The treatment for dissolving and removing the water-soluble yarn in the composite twisted yarn forming the woven or knitted fabric with water is usually preferable in the first stage from the viewpoint of the smoothness of the subsequent production process and the quality of the woven or knitted fabric.
The temperature of the water when dissolving and removing the water-soluble yarn in the composite twisted yarn forming the woven or knitted fabric with water is the type of water-soluble fiber constituting the water-soluble yarn, the solubility in water, the shape and thickness of the yarn, etc. Can be adjusted according to. When the water-soluble yarn is formed from water-soluble polyvinyl alcohol fibers, usually, when the treatment is performed using water at a temperature of 70 to 100 ° C., the water-soluble yarn is quickly dissolved and removed from the woven or knitted fabric in a short time. be able to.

The woven or knitted fabric obtained by dissolving and removing the water-soluble yarn in the composite twisted yarn forming the woven or knitted fabric with water from the woven or knitted fabric produced using the composite twisted yarn of the present invention is a portion where the water-soluble yarn was present. It has a good feel with high elasticity and swell due to synergistic effects such as increased yarn length and increased flexibility of the spun yarn untwisted by the space created in the reverse direction and the upper twist in the reverse direction, and it is lightweight Excellent breathability.
In addition, in the woven or knitted fabric after the water-soluble yarn is dissolved and removed with water, the two or more spun yarns constituting the composite twisted yarn remain in the woven or knitted fabric in the form of a twisted yarn that is twisted together. The fiber forming the fiber is not removed, and the strength is maintained.
Therefore, the woven or knitted fabric obtained by dissolving and removing the water-soluble yarn with water from the woven or knitted fabric produced from the composite twisted yarn of the present invention, taking advantage of the above-described excellent characteristics, for example, sports clothing, underwear, foundations, other It can be effectively used for clothing, medical applications such as elastic bandages, vehicle interior materials, belt conveyor fabrics, and other industrial materials.

Hereinafter, the present invention will be specifically described with reference to examples and the like, but the present invention is not limited to the following examples.
In the following Examples and Comparative Examples, the elongation rate of the fabric (plain woven fabric) was measured as follows.

[Elongation rate of fabric]
(1) From a fabric manufactured in the following example, a test piece (a) having a longitudinal dimension of 15 cm (length) and a weft dimension of 2.5 cm (width), and a longitudinal direction of the fabric Test pieces (b) each having a dimension of 2.5 cm (width) and a dimension in the weft direction of 15 cm (length) were cut out.
(2) A 1 g weight is attached to the center (the center in the width direction) of one end portion in the length direction of the test piece (a) cut out in the above (1), and the end portion to which the weight is attached is directed downward. The test piece was hung vertically and left in that state for 1 minute, and the length (La ₁ ) of the test piece (a) at that time was measured.
Next, the 1 g weight is removed from the end of the test piece (a). Instead, a 300 g weight is attached to the same place and hung vertically and left in that state for 3 minutes. The length (La ₂ ) (cm) was measured, and the elongation percentage (%) in the warp direction of the fabric was determined from the following mathematical formula (i).
Elongation rate in warp direction (%) = {(La ₂ −La ₁ ) / La ₁ } × 100 (i)
(3) A 1 g weight is attached to the center (one center in the width direction) of one end portion in the length direction of the test piece (b) cut out in the above (1), and the end portion with the weight is turned down. The test piece was suspended vertically and left in that state for 1 minute, and the length (Lb ₁ ) of the test piece (b) at that time was measured.
Next, the 1 g weight is removed from the end of the test piece (b). Instead, a 300 g weight is attached to the same location and hung vertically and left in that state for 3 minutes. At that time, the test piece (b) The length (Lb ₂ ) (cm) of the fabric was measured, and the elongation rate (%) in the weft direction of the fabric was determined from the following mathematical formula (ii).
Elongation rate in the weft direction (%) = {(Lb ₂ −Lb ₁ ) / Lb ₁ } × 100 (ii)

Example 1
(1) (i) As a spun yarn, a 40th spun yarn having a twist number of 800 times / m (Z-twisted) 100% cotton (“TS40 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.) was prepared. The spun yarn has a twist number T = 20.32 times per 2.54 cm and a count S = 40, so that the twist coefficient K obtained from the formula: K = (T / √S) is 20.32 / √40 = 20.332 / 6.32 = 3.22.
(Ii) As a water-soluble yarn, a polyvinyl alcohol multifilament yarn (56 dtex) (dissolved in water at 80 ° C.) (“water-soluble vinylon” manufactured by Kuraray Co., Ltd.) was prepared.

(2) Two spun yarns and one water-soluble yarn prepared in (1) above are supplied to a double twister (“36M” manufactured by Murata Machinery Co., Ltd.), and the twist number (upper twist) is 700 times / m ( The composite twisted yarn was manufactured by twisting together so that it would be (S twist) [twisted number of composite twisted yarn (upper twisted number) = 0.875 times the twisted number of spun yarn].
(3) A yarn of a predetermined length (1 m) is cut from the composite twisted yarn obtained in (2) above to obtain a sample yarn, the sample yarn is untwisted, and the two types of spun yarn and water-soluble yarn are used. It was separated into yarns, the mass of each separated yarn was measured, and the proportion of each yarn in the composite twisted yarn was determined from the measurement result. The composite twisted yarn was 84% by weight of spun yarn (the total of the two spun yarns). Mass) and 16% by mass of water-soluble yarn.

(4) A plain weave fabric having a warp of 25 / cm and a weft of 20 / cm was woven using the composite twisted yarn obtained in (2) above as a warp and a weft (100% blend ratio of composite twist yarn in a plain weave fabric). . In this weaving process, the plain weave fabric could be woven at high speed without causing any troubles such as thread breakage, and there was no problem in weaving mass productivity (weaving speed 0.1 m / min).
(5) The plain weave fabric obtained in (4) above is immersed in hot water at 90 ° C. for 15 minutes (bath ratio = 1: 15), and the water-soluble yarn in the composite twisted yarn forming the fabric is removed. Dissolved and removed, washed with hot water at 60 ° C. for 10 minutes (bath ratio = 1: 15), and then the dough was taken out of the water and dried at 150 ° C. When the stretch rate in the warp direction and the weft direction of the fabric thus obtained was measured by the method described above, the stretch rate in the warp direction was 22% and the stretch rate in the weft direction was 23%, which had high stretchability. It was. In addition, this fabric was plump and excellent in texture, lightweight and breathable, and further, the cotton fibers from the fabric did not come off, and it was excellent in strength.

Example 2
(1) A cotton No. 40 double yarn was used as the warp, and the composite twisted yarn obtained in (2) of Example 1 was used as the weft to weave a plain weave fabric of warp 25 / cm and weft 20 / cm. (The mixing ratio of the composite twisted yarn in the plain woven fabric is 40%). In this weaving process, the plain weave fabric could be woven at high speed without causing any troubles such as thread breakage, and there was no problem in weaving mass productivity (weaving speed 0.1 m / min).
(2) The plain weave fabric obtained in (1) above is immersed in hot water at 90 ° C. for 15 minutes (bath ratio = 1: 15) to dissolve the water-soluble yarn in the composite twisted yarn that forms the weft of the fabric. It was then removed and then washed with hot water at 60 ° C. for 10 minutes (bath ratio = 1: 15), after which the dough was removed from the water and dried at 150 ° C. When the elongation rate in the warp direction and the weft direction of the fabric thus obtained was measured by the method described above, the stretch rate in the warp direction was 11% and the stretch rate in the weft direction was 23%. Had. In addition, the fabric was plump and excellent in texture, and also excellent in lightness and breathability. In addition, there was no loosening of the cotton fibers from the wefts forming the fabric, and the weft strength of the wefts was excellent.

Example 3
(1) A 40th spun yarn (“TS40 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.) with 100% cotton of 800 times / m (Z twist) was prepared and used in Example 2 and the two spun yarns. Is supplied to a double twister (“36M” manufactured by Murata Machinery Co., Ltd.) and twisted so that the number of twists (upper twist) is 300 times / m (S twist). Thus, a composite twisted yarn was produced [the number of twists of the composite twisted yarn (the number of upper twists) = 0.375 times the number of twists of the spun yarn].
(2) A yarn of a predetermined length (1 m) is cut from the composite twisted yarn obtained in (1) above to obtain a sample yarn, and the upper twist of the sample yarn is released, and two types of yarn, a spun yarn and a water-soluble yarn are used. It was separated into yarns, the mass of each separated yarn was measured, and the proportion of each yarn in the composite twisted yarn was determined from the measurement result. The composite twisted yarn was obtained from 86% by weight of spun yarn and 14% by weight of water-soluble yarn. It was.

(3) A plain weave fabric with a warp of 25 / cm and a weft of 20 / cm was woven using the No. 40 cotton double yarn as the warp and the composite twisted yarn obtained in (1) above as the weft (plain weave) 40% of mixed twisted yarn in the fabric). In this weaving process, the plain weave fabric could be woven at high speed without causing any troubles such as thread breakage, and there was no problem in weaving mass productivity (weaving speed 0.1 m / min).
(4) The plain weave fabric obtained in (3) above is immersed in hot water at 90 ° C. for 15 minutes (bath ratio = 1: 15), and the water-soluble yarn in the composite twisted yarn forming the fabric is removed. It was removed by dissolution, and then washed with hot water at 60 ° C. for 10 minutes (bath ratio = 1: 15), and then the dough was taken out of the water and dried at 150 ° C. When the elongation rate in the warp direction and the weft direction of the fabric thus obtained was measured by the method described above, the stretch rate in the warp direction was 11% and the stretch rate in the weft direction was 21%. Had. Further, this fabric was plump and excellent in texture, and was excellent in lightness and breathability. In addition, there was no loosening of the cotton fibers from the wefts forming the fabric, and the weft strength of the wefts was excellent.

Example 4
(1) A 40th spun yarn (“TS40 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.) with 100% cotton of 800 times / m (Z twist) was prepared and used in Example 2 and the two spun yarns. Is supplied to a double twister ("36M" manufactured by Murata Machinery Co., Ltd.) and twisted so that the number of twists (upper twist) is 1400 times / m (S twist). To produce a composite twisted yarn [number of twists of composite twisted yarn (number of upper twists) = 1.75 times the number of twisted spun yarns].
(2) A yarn of a predetermined length (1 m) is cut from the composite twisted yarn obtained in (1) above to obtain a sample yarn, and the upper twist of the sample yarn is released, and two types of yarn, a spun yarn and a water-soluble yarn are used. It was separated into yarns, the mass of each separated yarn was measured, and the proportion of each yarn in the composite twisted yarn was determined from the measurement results. The composite twisted yarn was obtained from 84% by mass of spun yarn and 16% by mass of water-soluble yarn. It was.

(3) A plain weave fabric with a warp of 25 / cm and a weft of 20 / cm was woven using the No. 40 cotton double yarn as the warp and the composite twisted yarn obtained in (1) above as the weft (plain weave) 40% of mixed twisted yarn in the fabric). In this weaving process, the plain weave fabric could be woven at high speed without causing any troubles such as thread breakage, and there was no problem in weaving mass productivity (weaving speed 0.1 m / min).
(4) The plain weave fabric obtained in (3) above is immersed in hot water at 90 ° C. for 15 minutes (bath ratio = 1: 15), and the water-soluble yarn in the composite twisted yarn forming the fabric is removed. It was removed by dissolution, and then washed with hot water at 60 ° C. for 10 minutes (bath ratio = 1: 15), and then the dough was taken out of the water and dried at 150 ° C. When the elongation rate in the warp direction and the weft direction of the fabric thus obtained was measured by the method described above, the stretch rate in the warp direction was 11% and the stretch rate in the weft direction was 21%. Had. Further, this fabric was plump and excellent in texture, and was excellent in lightness and breathability. In addition, there was no loosening of the cotton fibers from the wefts forming the fabric, and the weft strength of the wefts was excellent.

Example 5
(1) 60th-yarn spun yarn with a twist of 900 times / m (Z-twisted) 100% cotton (“TS60 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.) and 100 cottons with a twist number of 700 times / m (Z-twisted) % 30th spun yarn (“TS30 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.), one of each of these spun yarns (two in total) and the same polyvinyl alcohol multifilament yarn 1 used in Example 1 The product was supplied to a double twister ("36M" manufactured by Murata Machinery Co., Ltd.) and twisted so that the number of twists (upper twist) was 800 times / m (S twist) to produce a composite twisted yarn The number of twists (the number of upper twists) = 0.89 times the number of twists of the 60th spun yarn, 1.14 times the number of twists of the 30th spun yarn].
(2) A yarn of a predetermined length (1 m) is cut from the composite twisted yarn obtained in (1) above to obtain a sample yarn, and the upper twist of the sample yarn is released, and two types of yarn, a spun yarn and a water-soluble yarn are used. It was separated into yarns, the mass of each separated yarn was measured, and the proportion of each yarn in the composite twisted yarn was determined from the measurement results. The composite twisted yarn was obtained from 85% by weight spun yarn and 15% by weight water-soluble yarn. It was.

(3) A plain weave fabric with a warp of 25 / cm and a weft of 20 / cm was woven using the No. 40 cotton double yarn as the warp and the composite twisted yarn obtained in (1) above as the weft (plain weave) 40% of mixed twisted yarn in the fabric). In this weaving process, the plain weave fabric could be woven at high speed without causing any troubles such as thread breakage, and there was no problem in weaving mass productivity (weaving speed 0.1 m / min).
(4) The plain weave fabric obtained in (3) above is immersed in hot water at 90 ° C. for 15 minutes (bath ratio = 1: 15), and the water-soluble yarn in the composite twisted yarn forming the fabric is removed. It was removed by dissolution, and then washed with hot water at 60 ° C. for 10 minutes (bath ratio = 1: 15), and then the dough was taken out of the water and dried at 150 ° C. When the elongation rate in the warp direction and the weft direction of the fabric thus obtained was measured by the above-described method, the stretch rate in the warp direction was 12% and the stretch rate in the weft direction was 22%. Had. Further, this fabric was plump and excellent in texture, and was excellent in lightness and breathability. In addition, a twisted unevenness due to the use of two spun yarns with different counts was obtained. Furthermore, there was no looseness of the cotton fibers from the wefts forming the fabric, and the weft strength of the wefts was excellent.

<< Comparative Example 1 >>
(1) Two 40-number spun yarns (“TS40 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.) with 100% cotton of 800 times / m (Z twist) and the same polyvinyl alcohol multi as used in Example 1 Supply one water-soluble yarn made of filament yarn (56 dtex) to a double twister (“36M” manufactured by Murata Machinery Co., Ltd.) so that the number of twists (upper twist) is 200 times / m (S twist). A composite twisted yarn was produced by twisting together [number of twists of composite twisted yarn (number of upper twists) = 0.25 times the number of twisted spun yarns].
(2) A yarn of a predetermined length (1 m) is cut from the composite twisted yarn obtained in (1) above to obtain a sample yarn, and the upper twist of the sample yarn is released, and two types of yarn, a spun yarn and a water-soluble yarn are used. It was separated into yarns, the mass of each separated yarn was measured, and the proportion of each yarn in the composite twisted yarn was determined from the measurement results. The composite twisted yarn was obtained from 84% by mass of spun yarn and 16% by mass of water-soluble yarn. It was.

(3) A plain weave fabric with a warp of 25 / cm and a weft of 20 / cm was woven using the No. 40 cotton double yarn as the warp and the composite twisted yarn obtained in (1) above as the weft (plain weave) 40% of mixed twisted yarn in the fabric) (weaving speed 0.1 m / min).
(4) The plain weave fabric obtained in (3) above is immersed in hot water at 90 ° C. for 15 minutes (bath ratio = 1: 15), and the water-soluble yarn in the composite twisted yarn forming the fabric is removed. It was removed by dissolution, and then washed with hot water at 60 ° C. for 10 minutes (bath ratio = 1: 15), and then the dough was taken out of the water and dried at 150 ° C. The warp direction elongation rate and the weft direction elongation rate of the fabric thus obtained were measured by the method described above. The warp direction elongation rate was 11% and the weft direction elongation rate was 14%. Examples 1-4 The elasticity was low compared to.

<< Comparative Example 2 >>
Two 40-degree spun yarns (“TS40 single yarn” manufactured by Tsuzuki Boseki Co., Ltd.) with 100% cotton of 800 turns / m (Z twist) and the same polyvinyl alcohol multifilament yarn used in Example 1 ( 56 dtex) is supplied to a double twister ("36M" manufactured by Murata Machinery Co., Ltd.) and twisted so that the number of twists (upper twist) is 2000 times / m (S twist). Although a composite twisted yarn was manufactured [the number of twists of the composite twisted yarn (number of top twists) = 2.5 times the number of twists of the spun yarn], the twisted yarn was difficult because of many yarn breaks, and the composite twisted yarn could not be manufactured. It was.

<< Comparative Example 3 >>
(1) Five tenth-yarn spun yarns (“TS10 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.) with 100% cotton of 350 turns / m (Z twist) and the same polyvinyl alcohol multi used in Example 1 Supply one water-soluble yarn made of filament yarn (56 dtex) to a double twister (“36M” manufactured by Murata Machinery Co., Ltd.) so that the number of twists (upper twist) is 200 times / m (S twist). A composite twisted yarn was manufactured by twisting together [number of twists of composite twisted yarn (number of upper twists) = 0.571 times the number of twisted spun yarns].
(2) A yarn of a predetermined length (1 m) is cut from the composite twisted yarn obtained in (1) above to obtain a sample yarn, and the upper twist of the sample yarn is released, and two types of yarn, a spun yarn and a water-soluble yarn are used. After separating into yarns, the mass of each separated yarn was measured, and the proportion of each yarn in the composite twisted yarn was determined from the measurement result. As a result, the composite twisted yarn was 98.2% by weight of spun yarn and 1. It was 8% by mass.

(3) A plain weave fabric of warp 25 / cm and weft 5 / cm was woven using the No. 40 cotton double yarn as the warp and the composite twisted yarn obtained in (1) above as the weft (plain weave) (Mixing ratio of composite twisted yarn in the fabric 60%) (weaving speed 0.1 m / min).
(4) The plain weave fabric obtained in (3) above is immersed in hot water at 90 ° C. for 15 minutes (bath ratio = 1: 15), and the water-soluble yarn in the composite twisted yarn forming the fabric is removed. It was removed by dissolution, and then washed with hot water at 60 ° C. for 10 minutes (bath ratio = 1: 15), and then the dough was taken out of the water and dried at 150 ° C. When the elongation rate in the warp direction and the weft direction of the fabric thus obtained was measured by the method described above, the elongation rate in the warp direction was 11% and the elongation rate in the weft direction was 13%. The elasticity was low compared to.

<< Comparative Example 4 >>
(1) 100th cotton yarn having a twist number of 1500 times / m (Z twist), 120th spun yarn [Royal Textile Mills Ltd. (India) “Royal 120”] and two water-soluble yarns made of the same polyvinyl alcohol multifilament yarn (56 dtex) used in Example 1 were double twisted (“36M” manufactured by Murata Machinery Co., Ltd.). And twisted so that the number of twists (upper twist) was 1500 times / m (S twist) to produce a composite twisted yarn [twisted number of composite twisted yarn (number of upper twisted) = twisted spun yarn 1.0 times the number].
(2) A yarn of a predetermined length (1 m) is cut from the composite twisted yarn obtained in (1) above to obtain a sample yarn, and the upper twist of the sample yarn is released, and two types of yarn, a spun yarn and a water-soluble yarn are used. It was separated into yarns, the mass of each separated yarn was measured, and the proportion of each yarn in the composite twisted yarn was determined from the measurement results. The composite twisted yarn was obtained from 37% by mass of spun yarn and 63% by mass of water-soluble yarn. It was.

(3) A plain weave fabric with a warp of 25 / cm and a weft of 20 / cm was woven using the No. 40 cotton double yarn as the warp and the composite twisted yarn obtained in (1) above as the weft (plain weave) 40% of mixed twisted yarn in the fabric) (weaving speed 0.1 m / min).
(4) The plain weave fabric obtained in (3) above is immersed in hot water at 90 ° C. for 15 minutes (bath ratio = 1: 15), and the water-soluble yarn in the composite twisted yarn forming the fabric is removed. It was removed by dissolution, and then washed with hot water at 60 ° C. for 10 minutes (bath ratio = 1: 15), and then the dough was taken out of the water and dried at 150 ° C. The dough thus obtained was inferior in form stability, easily slipped and low in practicality, so the elongation in the warp direction and the weft direction was not measured.

<< Reference Example 1 >>
(1) Use one piece of cotton No. 40 double yarn as the warp, and use the composite twisted yarn obtained in (2) of Example 1 and No. 30 cotton double yarn in the ratio of 1: 4 as the weft. A plain weave fabric with a warp of 25 / cm and a weft of 20 / cm was woven (mixing ratio of composite twisted yarn in plain weave fabric was 8%).
(2) The plain woven fabric obtained in the above (1) is immersed in hot water at 90 ° C. for 15 minutes (bath ratio = 1: 15), and the water-soluble yarn in the composite twisted yarn forming the fabric is obtained. It was removed by dissolution, and then washed with hot water at 60 ° C. for 10 minutes (bath ratio = 1: 15), and then the dough was taken out of the water and dried at 150 ° C. The warp direction elongation rate and the weft direction elongation rate of the fabric thus obtained were measured by the method described above, and the warp direction elongation rate was 11% and the weft direction elongation rate was 11%.

The composite twisted yarn of the present invention is excellent in knitting and weaving properties, and does not cause trouble such as yarn breakage when producing a woven fabric or knitted fabric. In addition, a woven or knitted fabric is produced from the composite twisted yarn of the present invention, and the water-soluble yarn in the woven or knitted fabric Is dissolved in water to remove it and has high elasticity, it is plump, has a good feel and texture, is excellent in properties such as lightness and breathability, and further forms a woven or knitted fabric Since the fiber does not come off from the spun yarn and a woven or knitted fabric excellent in strength is obtained, the composite twisted yarn of the present invention can be effectively used for the production of the above highly stretchable woven or knitted fabric.
The woven or knitted fabric of the present invention obtained by treating the woven or knitted fabric containing the composite twisted yarn of the present invention with water and dissolving and removing the water-soluble yarn in the composite twisted yarn with water has high stretchability, excellent texture, feel, Utilizing characteristics such as lightness and breathability, sports clothing, underwear, foundations, other clothing, medical applications such as elastic bandages, vehicle interior materials, belt conveyor fabrics, and other industrial materials It can be used effectively.

Claims (4)

(I) a composite twisted yarn obtained by twisting two or more spun yarns having the same twist direction and a water-soluble yarn;
(Ii) the twist direction of the composite twist yarn is opposite to the twist direction of the spun yarn;
(Iii) the number of twists of the composite twisted yarn is in the range of 0.3 to 2 times the number of twists of each of the two or more spun yarns; and
(Iv) based on the mass of the composite twisted yarn, the proportion of spun yarn is 98-40 mass and the proportion of water-soluble yarn is 2-60 mass%;
A composite twisted yarn characterized by that.   The composite twisted yarn according to claim 1, wherein the water-soluble yarn is a water-soluble filament yarn.   A woven or knitted fabric obtained by dissolving and removing water-soluble yarn in the composite twisted yarn with water from the woven or knitted fabric containing the composite twisted yarn according to claim 1 or 2. The woven or knitted fabric according to claim 3, wherein the water-soluble yarn in the composite twisted yarn is dissolved and removed from the woven or knitted fabric containing the composite twisted yarn according to claim 1 or 2 at a ratio of 10% by mass or more.