JP2007332506A - Composite twisted yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a woven or knitted fabric having excellent elasticity and kickback properties (properties of shrinking to the original state when released from an elongated state), and further having excellent feeling, touch feeling, lightweight properties, air permeability or the like; and to provide a composite twisted yarn effectively usable for the production thereof. <P>SOLUTION: The composite twisted yarn obtained by twisting a spun yarn and a water-soluble yarn is regulated so that the twisting direction of the composite yarn may be the same as that of the spun yarn, the twist count of the composite yarn may be 0.3-1.5 times as much as that of the spun yarn, and the mass ratio of the contents of the spun yarn to the water-soluble yarn in the composite twisted yarn may be (98:2)-(20:80). The woven or knitted fabric is obtained by dissolving and removing the water-soluble yarn in the composite twisted yarn with water from the woven or knitted fabric formed from the composite twisted yarn. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a composite twisted yarn, a woven or knitted fabric using the composite twisted yarn, and a method for producing the woven or knitted fabric. More specifically, the present invention relates to a composite twisted yarn in which two types of yarns, a spun yarn and a water-soluble yarn, are twisted together, a woven or knitted fabric obtained by dissolving and removing water-soluble yarn with water from a woven or knitted fabric formed from the composite twisted yarn. The woven or knitted fabric obtained by dissolving and removing the water-soluble yarn from the woven or knitted fabric containing the composite twisted yarn of the present invention is excellent in stretchability and shrinks to the original state when released from the stretched state. Excellent properties (so-called “kickback”).

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 stretch composite yarns include core spun yarn in which the core yarn made of polyurethane elastic yarn is covered with spinning cotton and twisted, and a single layer of spun yarn around the core yarn made of polyurethane elastic yarn Or there are single covered yarns or double covered yarns wound around multiple layers, two or more spun yarns and pliers made by twisting polyurethane elastic yarns, and these composite yarns can be used to produce stretch woven or knitted fabrics. Generally done.
However, since the above-described conventional composite yarn uses a polyurethane elastic yarn having extremely large stretchability, a special device and a high technique are required for handling the yarn and knitting 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, since the woven or knitted fabric produced using the polyurethane composite yarn always contains polyurethane elastic yarn lacking in flexibility, lightness, breathability, etc., for example, 100% cotton woven fabric and 100% polyester fiber woven fabric. Are often inferior in flexibility, texture, lightness, breathability, etc.

  From the above point, a method for producing a stretchable woolen fabric without using polyurethane elastic yarn has been proposed (see Patent Document 1). In the method of Patent Document 1, a fabric is formed from a mixed spun yarn composed of wool fibers and water-soluble polyvinyl alcohol fibers, and the fabric is immersed in water and heated with stirring to shrink the water-soluble polyvinyl alcohol fibers. Later, the water-soluble polyvinyl alcohol fiber is dissolved and removed to form a wool fiber-only fabric, and the fabric is set to produce a stretchable wool fabric. However, the mixed spun yarn made of wool fibers and water-soluble polyvinyl alcohol fibers 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 wool fabric obtained by removing water-soluble polyvinyl alcohol fibers from a fabric formed from the mixed spun yarn is not yet sufficiently stretchable and lacks strength and the like. Furthermore, 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 fabric.

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

From the above points, the present inventors have continued research for the purpose of obtaining a stretchable woven or knitted fabric without using polyurethane elastic yarn. As a result, a spun yarn and a water-soluble yarn are twisted in a direction opposite to the twisted direction of the spun yarn to form a composite twisted yarn, and the water-soluble yarn in the composite twisted yarn is obtained from a woven or knitted fabric obtained by knitting and weaving the composite twisted yarn. It has been found that a woven or knitted fabric having high stretchability and excellent in lightness, texture, flexibility, breathability, etc. can be obtained by dissolving and removing water with water. Filed earlier (see Patent Document 3).
As a result of further studies by the present inventors based on the invention of Patent Document 3, weaving and weaving using this composite twisted yarn obtained by twisting a spun yarn and a water-soluble yarn in a direction opposite to the twisted direction of the spun yarn. The woven or knitted fabric obtained by dissolving and removing water-soluble yarn from the woven or knitted fabric with water has extremely high elasticity, but if it is repeatedly expanded or stretched for a long time, it remains stretched. Even if the stretched state is released, it does not shrink to the original state, and the “kickback property” is insufficient. In particular, a spun yarn made of cotton or rayon is used as the spun yarn constituting the composite twisted yarn. It was found that kickback performance was insufficient. For example, when slacks are produced using a woven or knitted fabric (fabric) obtained by dissolving and removing water-soluble yarns from a woven or knitted fabric produced by knitting and weaving the composite twisted yarn of Patent Document 3, it is comfortable to wear due to its high stretchability. Slacks are obtained, but on the other hand, in the part of the knee and buttocks that are repeatedly stretched or maintained for a long time, the yarn in the fabric remains stretched and it is difficult to shrink to the original state, It has been found that slack mold deformation tends to occur.

Japanese Patent Laid-Open No. 11-241269 European Patent No. 1061162B1 Japanese Patent Application No. 2004-338000

The object of the present invention is excellent in stretchability without using polyurethane elastic yarns, and even when it is repeatedly stretched or stretched for a long time, when it is released from the stretched state, it shrinks to its original state. It is an object of the present invention to provide a composite yarn capable of producing a woven or knitted fabric exhibiting good kickback properties.
Furthermore, the objective of this invention is providing the composite yarn which can obtain the woven / knitted fabric which is excellent also in lightness, a feeling, a touch, breathability etc. in addition to the above-mentioned kickback property.
In addition, the object of the present invention is excellent in weaving and weaving without trouble such as yarn breakage when using a high-speed loom or knitting machine, spun yarn made of natural fiber, spun yarn made of synthetic fiber, 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 for the production of a woven or knitted fabric having excellent properties and kickback properties.
An object of the present invention is to provide a woven or knitted fabric that does not use polyurethane elastic yarn, and has a superior stretchability and kickback property, and is excellent in lightness, texture, feel, breathability, and the like, and a method for producing the same. is there.

The present inventors have intensively studied to achieve the above-described object. As a result, instead of the above-described invention of Patent Document 3 in which the spun yarn and the water-soluble yarn are twisted in the direction opposite to the twisted direction of the spun yarn to form a composite twisted yarn, the spun yarn and the water-soluble yarn at a specific ratio. When twisted with a specific number of twists in the same direction as the twist direction of the spun yarn to make a composite twisted yarn, a woven or knitted fabric is produced using the composite twisted yarn, and the water-soluble yarn is dissolved and removed from the woven or knitted fabric with water. A gap is formed at the place where the soluble yarn is dissolved and removed, thereby imparting good stretchability to the woven or knitted fabric, and twisting torque is generated in the spun yarn twisted during the production of the composite twisted yarn. It has been found that a high kickback property is given to take a role and to return to the original state after being extended.
The inventors have also found that the woven or knitted fabric obtained thereby is excellent in terms of lightness, texture, touch, breathability, and the like.

Furthermore, the present inventors have made in this composite twisted yarn in which the twist direction of the composite twisted yarn is the same as the twisted direction of the spun yarn. As the spun yarn, the spun yarn made of natural fiber, the spun yarn made of synthetic fiber, and the semi-synthetic fiber made Various spun yarns such as spun yarn can be used, especially when using spun yarn made of cellulosic fibers such as cotton and hemp, and this composite twisted yarn is excellent in knitting and weaving, It has been found that troubles such as yarn breakage do not occur even when weaving and knitting using a high-speed loom or knitting machine, and that any composite twisted yarn can be produced from fine count to thick count.
Further, the inventors of the present invention have produced a specific degree of polymerization in which ethylene is copolymerized at a specific ratio as a water-soluble yarn in the production of this composite twisted yarn in which the twist direction of the composite twisted yarn is the same as the twisted direction of the spun yarn. When the yarn comprising the fibers of the ethylene-vinyl alcohol copolymer is used, the water-soluble yarn from the knitted or knitted fabric produced from the composite twisted yarn is better dissolved and removed by water, and the stretchability and kickback property It was found that a superior woven or knitted fabric can be obtained, and the present invention was completed based on these various findings.

That is, the present invention
(1) A composite twisted yarn obtained by twisting a spun yarn and a water-soluble yarn, wherein the twist direction of the composite twist yarn is the same as the twist direction of the spun yarn, and the twist number of the composite twist yarn is 0.3 of the twist number of the spun yarn. The composite twisted yarn is characterized by having a mass ratio of 98: 2 to 20:80 of the spun yarn: water-soluble yarn in the composite twisted yarn in a ratio of .about.1.5 times.

And this invention,
(2) A yarn comprising a fiber obtained by melt-spinning an ethylene-vinyl alcohol copolymer having a degree of polymerization of 200 to 500 and containing 5 to 15 mol% of a structural unit derived from ethylene. The composite twisted yarn of (1) above; and
(3) The composite twisted yarn of (1) or (2) above, wherein the spun yarn is a spun yarn comprising natural cellulosic fibers;
It is.

Furthermore, the present invention provides
(4) 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 any one of (1) to (3);
(5) From the woven or knitted fabric containing the composite twisted yarn of any one of (1) to (3) at a ratio of 20% by mass or more, the water-soluble yarn in the composite twisted yarn is dissolved and removed with water. Woven and knitted fabric; and
(6) After heat-treating the composite twisted yarn of any one of (1) to (3), a woven or knitted fabric is produced using the heat-treated yarn, and the water-soluble yarn is dissolved and removed from the woven or knitted fabric with water. A method for producing a woven or knitted fabric not containing;
It is.

The composite twisted yarn of the present invention is produced by preparing a woven or knitted fabric from the composite twisted yarn of the present invention even though no polyurethane elastic yarn is used, and dissolving and removing the water-soluble yarn in the woven or knitted fabric in water. In addition to being excellent in stretchability, it is possible to obtain a fabric excellent in “kickback property” that shrinks to its original state when released from the stretched state, and also excellent in lightness, breathability, texture, touch, etc. .
In the composite twisted yarn of the present invention, various spun yarns such as a spun yarn made of natural fiber, a spun yarn made of synthetic fiber, and a spun yarn made of semi-synthetic fiber can be used as spun yarn, especially cotton, hemp, etc. A spun yarn made of natural cellulose fiber is preferably used. In particular, in the case of the composite twisted yarn of the present invention in which the spun yarn constituting the composite twisted yarn is a spun yarn made of natural cellulosic fibers such as cotton and hemp, a water-soluble yarn is obtained from a woven or knitted fabric produced using the composite twisted yarn. By dissolving and removing with water, it is possible to obtain a woven or knitted fabric that is 100% natural cellulosic fiber and is excellent in stretchability and kickback property, and also excellent in touch, texture, lightness, and breathability.
Since the composite twisted yarn of the present invention has water-soluble yarn in the yarn, it has less fuzz and further plays a role of reinforcement. Therefore, troubles such as yarn breakage occur using a high-speed loom or knitting machine. In addition, the knitted or knitted fabric can be smoothly produced with high productivity without performing a gluing process at the time of warping.
The composite twisted yarn of the present invention can be produced using any spun yarn from fine count to thick count.
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, creates a gap where the water-soluble yarn is dissolved. , The degree of freedom is increased, the elasticity is high, and the spun yarn is twisted at the time of production of the composite twisted yarn, so it has high kickback property, and further, appearance, feel, breathability, light weight Excellent in properties.
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 types of yarn, spun yarn and water-soluble yarn.
The spun yarn constituting the composite twisted yarn may be any spun yarn formed from fibers that do not dissolve in water (hot water, hot water, cold water). For example, natural fibers such as cotton, hemp, silk, wool, polyester Fiber, polyamide fiber, polypropylene fiber, acrylic fiber, water (hot water) insoluble polyvinyl alcohol fiber, synthetic fiber such as polyvinylidene chloride fiber, semi-synthetic fiber such as acetate, regenerated fiber such as rayon and cupra Either a single spun yarn composed of one type of fiber or a mixed spun yarn composed of two or more of the above-described fibers may be used. 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. Among them, the effect of the composite twisted yarn of the present invention, particularly the effect of maintaining the kickback property, is particularly strongly exhibited using spun yarn made of natural cellulosic fibers such as cotton and hemp.

The spun yarn may be a single yarn, a yarn in which two or more single yarns are aligned, a twin yarn, or three or more twisted yarns.
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.
The number of twists of the spun yarn is not particularly limited. When the number of twists is T (unit: times / 2.54 cm) and the cotton count is S (unit: count), the twist coefficient K is represented by K = T / √S. Are 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.

When the spun yarn is a twin yarn or three or more twisted yarns, the final twist direction when the spun yarns are produced is the same as the single yarn twist direction used for the production of the double yarn or the twisted yarn. The reverse twist and the number of twists of the last twist (the number of twists of the spun yarn referred to in the present invention; the number of twists when the twin yarn or the twisted yarn was produced) The number of twists of the single yarn used is preferably 0.3 to 0.9 times from the viewpoints of productivity of twisted yarn, handleability of yarn, feel, availability of spun yarn, and the like.
Further, as the yarn count of the spun yarn, those having a cotton count of 5 to 140 are preferably used from the viewpoints of processability when producing the composite twisted yarn, availability of the spun yarn, market requirements, and the like.

As the water-soluble yarn, a yarn that dissolves in water (hot water) at a pressure up to the boiling temperature of water (about 100 ° C.) under atmospheric pressure is preferably used, and the water-soluble yarn itself has a temperature of 80 ° C. or more alone. A water-soluble yarn that dissolves 95% by mass or more with respect to the mass of the water-soluble yarn before immersion when immersed in water for 30 minutes is more preferably used.
In particular, in the present invention, an ethylene-vinyl alcohol copolymer having a degree of polymerization of 200 to 500 and containing 5 to 15 mol% of a structural unit derived from ethylene (hereinafter referred to as “ethylene unit”) is used as the water-soluble yarn. Yarns made of fibers obtained by melt spinning are preferably used. The composite twisted yarn of the present invention produced using a yarn comprising the specific ethylene-vinyl alcohol copolymer fiber is excellent in handleability, and the woven or knitted fabric produced from the composite twisted yarn is treated with water in the woven or knitted fabric. When the water-soluble yarn is dissolved and removed, the water-soluble yarn can be dissolved and removed more easily and smoothly, and the water-soluble yarn itself, which is the original yarn of the composite twisted yarn, can be easily produced.

  In the composite twisted yarn of the present invention formed by twisting a spun yarn and a water-soluble yarn in the same direction as the twisted direction of the spun yarn, the composite twisted yarn is strongly twisted by the composite twisted yarn and has a dense structure. When the water-soluble yarn in the composite twisted yarn is dissolved and removed by treating the woven or knitted fabric produced using the water with water, it takes time for water to penetrate into the composite twisted yarn, and the water-soluble yarn is dissolved accordingly. Hateful. Therefore, it is necessary to use a water-soluble yarn that has higher solubility in water. If the water-soluble yarn has low water solubility, it takes time to dissolve and remove the water-soluble yarn from the woven or knitted fabric. The yarn is not sufficiently dissolved and removed, making it difficult to impart sufficient stretchability and light weight to the woven or knitted fabric.

  Furthermore, a woven or knitted fabric is produced using the composite twisted yarn of the present invention in which a spun yarn and a water-soluble yarn are twisted in the same direction as the twisted direction of the spun yarn, and the water-soluble yarn in the woven or knitted fabric is dissolved and removed with water. At this time, since a strong torque is applied to the yarn, the processability of knitting and weaving is likely to be impaired. Therefore, it is highly desirable to fabricate and weave the composite twisted yarn after heat treatment to reduce the torque. As the heat treatment conditions, a method of using hot air or heated steam at 60 to 90 ° C. for about 10 to 60 minutes is preferable. More preferably, it is a method of treating at 70 to 85 ° C. for 15 to 40 minutes using heated steam. In the heat treatment, a method using heated steam as described above is preferably employed. In this case, the water-soluble yarn is composed of polyvinyl alcohol fibers having a polymerization degree of 1500 to 2500 like conventional water-soluble polyvinyl alcohol fibers. The polyvinyl alcohol fibers are once dissolved by the water vapor droplets adhering to the woven or knitted fabric, but when the temperature of the woven or knitted fabric after the heat treatment decreases, the polyvinyl alcohol fibers re-solidify. In the process of dissolving polyvinyl alcohol fibers with water, it is extremely difficult to dissolve, and undissolved polyvinyl alcohol remains in spots on the woven or knitted fabric, and there is a problem that dyed spots and product spots are likely to occur.

On the other hand, as a water-soluble yarn, a yarn made of a fiber obtained by melt spinning an ethylene-vinyl alcohol copolymer having a degree of polymerization of 200 to 500 having an ethylene unit content of 5 to 15 mol% was used. In some cases, the solubility in water is extremely high, and even if it is once dissolved by droplets from heated steam for heat treatment and then re-solidified, the re-solidified product is well dissolved and removed during the dissolution treatment with water after heat treatment. As a result, it does not remain in the woven or knitted fabric.
The reason for this is not clear, but because the degree of polymerization of the ethylene-vinyl alcohol copolymer is as low as 200 to 500 by constituting an ethylene-vinyl alcohol copolymer fiber, the polymerization degree is generally 1500 to 2500. Compared to conventional water-soluble polyvinyl alcohol fibers made of alcohol, it has higher water solubility, and it has ethylene units in the polymer chain, which reduces bonding and reaction between hydroxyl groups in vinyl alcohol units. It is presumed that the decrease in solubility of the fiber in water is prevented.

When a yarn made of ethylene-vinyl alcohol copolymer fiber is used as the water-soluble yarn, if the degree of polymerization of the ethylene-vinyl alcohol copolymer forming the fiber is less than 200, the ethylene-vinyl alcohol copolymer weight The stringing property of the coalescence is low, and it tends to be difficult to form a fiber. On the other hand, when the degree of polymerization of the ethylene-vinyl alcohol copolymer forming the fibers exceeds 500, the melt viscosity becomes too high, making it difficult to produce ethylene-vinyl alcohol copolymer fibers by melt spinning, and water. Because the solubility is lowered, after making a woven or knitted fabric from a composite twisted yarn composed of spun yarn and ethylene-vinyl alcohol copolymer fiber, the ethylene-vinyl alcohol copolymer fiber in the woven / knitted fabric is dissolved and removed with water. When this is done, the ethylene-vinyl alcohol copolymer fiber is hardly completely dissolved and removed, making it difficult to obtain a stretchable woven or knitted fabric.
The degree of polymerization of the ethylene-vinyl alcohol copolymer forming the fiber is more preferably 250 to 450.
Here, “the degree of polymerization of ethylene-vinyl alcohol copolymer” and “the degree of polymerization of polyvinyl alcohol” in the present specification are both determined by JIS K 6726, after re-saponifying and purifying the polymer. The degree of polymerization (P) determined by the following formula (I) from the intrinsic viscosity [η] (dl / g) measured in water at 30 ° C.

P = ([η] × 10 ³ /8.29) ^{(1 / 0.62)} (I)

Moreover, when using a yarn comprising an ethylene-vinyl alcohol copolymer fiber as a water-soluble yarn, the ethylene unit content in the ethylene-vinyl alcohol copolymer forming the fiber is less than 5 mol%, It becomes difficult to produce an ethylene-vinyl alcohol copolymer fiber by melt spinning. On the other hand, if the ethylene unit content exceeds 15 mol%, the water solubility decreases, and the spun yarn and the ethylene-vinyl alcohol copolymer weight are reduced. After producing a woven or knitted fabric from a composite twisted yarn consisting of yarns of united fibers, when the ethylene-vinyl alcohol copolymer fiber in the woven or knitted fabric is dissolved and removed with water, the ethylene-vinyl alcohol copolymer fiber is completely dissolved. It becomes difficult to remove, and it becomes difficult to obtain a stretch woven or knitted fabric.
As for the content rate of the ethylene unit in the ethylene-vinyl alcohol-type copolymer which forms a fiber, it is more preferable that it is 7-12 mol%.

Further, the saponification degree of the vinyl alcohol unit in the ethylene-vinyl alcohol copolymer forming the fiber is 90 to 99.99 mol%, particularly 97 to 99.9 mol%, and the solubility in water is high. From the viewpoint of excellent spinning stability.
The ethylene-vinyl alcohol copolymer fiber that is preferably used as the water-soluble yarn in the present invention can be produced smoothly and easily by melt spinning, and is generally produced by wet spinning or dry spinning. It is different from conventional water-soluble polyvinyl alcohol fibers.

  The water-soluble yarn may be either a filament yarn or a spun yarn as long as it is water-soluble. Among them, it is preferable to use a water-soluble filament yarn. When a water-soluble filament yarn is used, the woven or knitted fabric produced from the composite twisted yarn is treated with water even when the mixing ratio of the water-soluble yarn in the composite twisted yarn is low. When the water-soluble yarn is dissolved and removed, the water-soluble yarn is removed promptly and well, the composite twisted yarn has high yarn strength, the fine yarn spun yarn is easy to use, and the low mixing ratio There are merits such as being able to use it and reducing the cost.

  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 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 (a yarn that is removed after being formed into 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 needs to have a mass ratio of spun yarn: water-soluble yarn of 98: 2 to 20:80, preferably 95: 5 to 30:70. 90:10 to 50:50 is more preferable.
By setting the content ratio of the spun yarn and the water-soluble yarn within the above range, a composite twisted yarn excellent in knitting, yarn strength, twist stability, and the like can be obtained. In addition, when the water-soluble yarn in the composite twisted yarn is dissolved and removed from the woven or knitted fabric produced from the composite twisted yarn with water, the water-soluble yarn is well removed, and the gap formed by the removal of the water-soluble yarn, The degree of freedom can be increased and the stretchability can be improved accordingly, and the texture, feel, lightness, breathability and the like of the woven or knitted fabric can be 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 , The stability of the form is lowered, and the occurrence of blinding tends to occur.

  As the number of spun yarns and water-soluble yarns constituting the composite twisted yarn (number of yarns), 1 to 3 spun yarns and 1 to 3 water-soluble yarns from the viewpoint of limiting the number of krills of the twisting machine and quality control. It is preferable that the number of spun yarns is 1 to 2 and that of water-soluble yarns is 1 to 2, and that one spun yarn and one water-soluble yarn are twisted to form a composite twisted yarn. Further preferred.

  In the composite twisted yarn of the present invention, the twist direction of the composite twisted yarn (twisted direction when twisting two types of yarns of the spun yarn and the water-soluble yarn) (hereinafter, the twist of the composite twisted yarn may be referred to as “up twist”), The twist direction of the spun yarn constituting the composite twisted yarn (hereinafter, the twist of the spun yarn is sometimes referred to as “bottom twist”), and the number of twists of the composite twisted yarn (the number of upper twists) is the same as that of the spun yarn It is necessary to be 0.3 to 1.5 times the number of twists (number of lower twists).

  When twisting, it is common to reverse the twist direction of the upper twist with the twist direction of the lower twist. However, in the composite twisted yarn of the present invention, in order to give torque to the composite twisted yarn, The direction (twist direction of the composite twisted yarn) is the same as the twist direction of the lower twist (twist direction of the spun yarn). Thereby, when a woven or knitted fabric is produced using the composite twisted yarn of the present invention, and the water-soluble yarn is dissolved and removed from the woven or knitted fabric with water, a woven or knitted fabric having excellent stretchability and excellent kickback property can be obtained. it can.

Even if the twist direction of the composite twisted yarn is the same as the twist direction of the spun yarn, the number of twists of the composite twisted yarn (number of upper twists) is less than 0.3 times the number of twisted yarns (number of lower twists) The torque of the spun yarn that acts as a spring becomes insufficient, and even if the water-soluble yarn is dissolved and removed from the woven or knitted fabric with water, a woven or knitted fabric with excellent kickback properties cannot be obtained. If the number (number of upper twists) is larger than 1.5 times the number of twisted yarns (number of lower twists), twisting process or weaving process due to excessive breakage of torque and excessive torque It tends to cause defects, a decrease in strength of the resulting composite twisted yarn, a process defect during knitting, a decrease in productivity, and the like.
In the composite twisted yarn of the present invention, the number of twists of the upper twist (composite twisted yarn) is preferably 0.5 to 1.35 times the number of twists of the lower twist (spun yarn), and 0.6 to 1.3 times. More preferably.
The “twist number of the composite twisted yarn” (the twist number of the upper twist) in the present specification is the twist number when the spun yarn and the water-soluble yarn are twisted together, and in actuality during the twisting process. It becomes a value according to the set twist number.

  The type of the twisting machine used when twisting the spun yarn and the water-soluble yarn is not particularly limited. For example, a conventional general-purpose twisting machine such as a double twister, a ring twister, or an up twister can be used.

  The composite twisted yarn of the present invention obtained as described above has a strong torque, and if it does not interfere with the knitting and weaving process, it can be used as it is for the production of woven or knitted fabric without reducing the torque by heat treatment or the like. it can. If there is a problem in the weaving and weaving process due to the torque, heat treatment is preferably performed. 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.

A woven or knitted fabric is produced by knitting and weaving using the composite twisted yarn of the present invention. There are no particular restrictions on the type of woven or knitted fabric or the content of the organization.
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 give sufficient stretchability and kickback properties to the woven or knitted fabric after dissolving and removing the water-soluble yarn in the woven or knitted fabric, the water-soluble yarn in the composite twisted yarn forming the woven or knitted fabric is dissolved and removed with water. In the woven or knitted fabric before the knitting, it is preferable that the use ratio of the composite twisted yarn of the present invention is 20% by mass or more based on the mass of the woven or knitted fabric. In consideration of the form stability of the woven or knitted fabric obtained by dissolving and removing the water-soluble yarn, the composite twisted yarn of the present invention is used 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. Is more preferably 40% by mass or more based on the mass of the woven or knitted fabric.
In terms of the content ratio of the water-soluble yarn, the woven or knitted fabric before dissolving and removing the water-soluble yarn in the composite twisted yarn forming the woven or knitted fabric has 5 water-soluble yarns based on the mass of the woven or knitted fabric. -30% by mass, especially 8-20% by mass, woven and knitted fabric obtained by dissolving and removing water-soluble yarns, stretchability, kickback, texture, breathability, form retention, etc. From the point of view, it is preferable.

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 ethylene-vinyl alcohol copolymer fiber or water-soluble polyvinyl alcohol fiber, it is usually treated with water at a temperature of 70 ° C. or higher, particularly 80 ° C. or higher. The characteristic yarn can be quickly removed from the woven or knitted fabric in a short time.

  A 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 excellent in stretchability and kickback property. Light weight, breathability, and touch are also excellent. Taking advantage of these properties, for example, sports apparel, underwear, foundations, other apparel, medical applications such as elastic bandages, vehicle interior materials, belt conveyor fabrics It can be used effectively for 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 and kickback property of the woven fabric (plain woven fabric) were measured or evaluated as follows.

(1) Elongation rate of plain weave fabric:
(I) A test piece having a length of 15 cm and a width of 2.5 cm was cut along the warp direction of the dough from the plain weave dough produced in the following example. In the same manner as described above, another test piece having a length of 15 cm and a width of 2.5 cm was cut along the weft direction of the dough.
(Ii) The test piece cut out in the above (i) is attached with a 5 g weight at the center (the center in the width direction) of the lower end of the fabric so that the length direction hangs down from the top, and in that state for 1 minute The sample was allowed to stand, and the length (L ₁ ) of the test piece at that time was measured.
(Iii) Next, the 5 g weight is removed from the lower end of the test piece, and instead a 300 g weight is attached to the same location and left in that state for 3 minutes. The length of the test piece at that time (L ₂ ) (cm) Was measured, and the elongation percentage (%) of the plain weave fabric was determined from the following formula (II).

Elongation rate (%) = {(L ₂ −L ₁ ) / L ₁ } × 100 (II)

Here, the elongation rate in the warp direction is the elongation rate of the test piece cut out so that the length direction of the test piece becomes the warp direction of the fabric, and the elongation rate in the weft direction is the length direction of the test piece. It is the elongation rate in the test piece cut out in the weft direction.

(2) Kickback properties of plain weave fabrics:
In the above operation (1) for obtaining the elongation rate of the plain weave fabric, after removing the 300 g weight attached to the lower end of the test piece, the test piece is laid on a flat place and left for 5 hours. Attach a 5 g weight to the lower end of the sample and leave it for 1 minute, measure the length (L ₃ ) (cm) of the test piece at that time, and obtain the elongation recovery rate in the test piece from the following formula (III). It was used as an index of kickback performance. The greater the recovery rate, the better the kickback performance.

Elongation recovery rate (%) = {1− (L ₃ −L ₁ ) / L ₁ } × 100 (III)

Example 1
(1) (i) As a spun yarn, a 20th spun yarn having a twist number of 600 times / m (Z-twisted) 100% cotton (“TS20 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.) was prepared. In this spun yarn, the number of twists per 2.54 cm is T = 15.24, and the count S is 20, so that the twist coefficient K obtained from the formula: K = (T / √S) is 15.24 / √20 = 15.24 / 4.47 = 3.24.
(Ii) An ethylene-vinyl alcohol copolymer having an ethylene unit content of 10 mol% and a polymerization degree of 300 and a saponification degree of 98.4 mol% was melt-spun at 240 ° C. and then 2.0 times at 170 ° C. To produce an ethylene-vinyl alcohol copolymer multifilament yarn (56 dtex) (dissolved in water at 80 ° C.), and this yarn was used as a water-soluble yarn.
(Iii) Supply one spun yarn prepared in (i) above and one water-soluble yarn obtained in (ii) above to a twisting machine (Murata Kikai "36M"), The twist was made so that the twist was 400 times / m (Z twist) to produce a composite twisted yarn (the number of twists of the composite twisted yarn = 0.67 times the number of twists of the spun yarn). Thereafter, the obtained composite twisted yarn was heat-treated with water vapor (80 ° C.) for 30 minutes using a vacuum setting machine (“vacuum steam setter” manufactured by Nikkham), and then taken out from the vacuum setting machine.
(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) Using the composite twisted yarn obtained in (2) above as a warp and weft, weaved a plain weave fabric with a warp of 25 / cm and a weft of 20 / cm (100% of composite twist yarn in a plain weave fabric) . In the weaving process, the plain weave fabric could be woven at high speed without causing any troubles such as yarn 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 a hot water bath at 90 ° C. for 30 minutes (bath ratio = 1: 10), and the water-soluble yarn in the composite twisted yarn forming the fabric is obtained. After dissolving and removing, the dough was taken out from the hot water bath, washed with hot water at 80 ° C., and dried at 150 ° C.
(5) When the stretch rate in the warp direction and the weft direction of the fabric obtained in the above (4) was measured by the method described above, the stretch rate in the warp direction was 15% and the stretch rate in the weft direction was 16%. It had high elasticity. Further, when the elongation recovery rate of the fabric was measured by the method described above, the elongation recovery rate in the warp direction was 72% and the elongation recovery rate in the weft direction was 70%, and the kickback property was excellent. Moreover, this fabric had completely dissolved and removed the water-soluble yarn, and was excellent in lightness, breathability and texture.

Example 2
(1) A cotton No. 40 double yarn was used as the warp, and the composite twisted yarn obtained in (1) of Example 1 was used as the weft to weave a plain weave fabric of warp 25 / cm and weft 22 / cm. (Mixing ratio of 45% of composite twisted yarn in plain woven fabric) In the weaving process, the plain weave fabric could be woven at high speed without causing any troubles such as yarn breakage, and there was no problem in weaving mass productivity (weaving speed 0.1 m / min).
(2) The plain woven fabric obtained in (1) above was immersed in a hot water bath at 90 ° C. for 30 minutes (bath ratio = 1: 10) in the same manner as in (4) of Example 1 to obtain a fabric. Then, the water-soluble yarn in the composite twisted yarn forming was removed and the fabric was taken out of the hot water bath, washed with hot water at 80 ° C. and dried.
(3) When the stretch rate in the warp direction and the weft direction of the fabric obtained in the above (2) was measured by the method described above, the stretch rate in the warp direction was 3% and the stretch rate in the weft direction was 16%. . Further, the elongation recovery rate in the weft direction of this fabric was measured by the method described above, and it was 70%, and it had good stretchability and kickback properties in the weft direction. Moreover, this fabric had completely dissolved and removed the water-soluble yarn, and was excellent in lightness, breathability and texture.

Example 3
(1) The same spun yarn as prepared in (i) of Example 1 [twisting number 600 times / m (Z twisted), 100% cotton, 20th spun yarn (“TS20 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.)] Each of the same water-soluble yarns [ethylene-vinyl alcohol copolymer multifilament yarn (56 dtex) (dissolved in water at 80 ° C.)] produced in Example (ii) was used. Supplying to the same twisting machine used by (iii), it twisted together so that a twist number (upper twist) might be 800 times / m (Z twist), and manufactured the composite twisted yarn (twist number of composite twisted yarn) = 1.33 times the number of twists of the spun yarn) After that, the obtained composite twisted yarn was subjected to water vapor (80 ° C.) for 30 minutes using the same vacuum setting machine used in (1) of Example 1. After heat treatment, it was removed from the vacuum setting machine.
(2) A yarn of a predetermined length (1 m) is cut out from the composite twisted yarn obtained in (1) above to obtain a sample yarn, and the spun yarn and water-soluble yarn in the composite twisted yarn in the same manner as in (2) of Example 1 The composite twisted yarn was composed of 84% by mass of spun yarn and 16% by mass of water-soluble yarn.
(3) Weaving a plain weave fabric of warp 25 / cm and weft 22 / cm using a cotton No. 40 double yarn as a warp and using the composite twisted yarn obtained in (2) above as a weft (plain weave fabric) Of 45% of mixed twisted yarn). In the weaving process, the plain weave fabric could be woven at high speed without causing any troubles such as yarn breakage, and there was no problem in weaving mass productivity (weaving speed 0.1 m / min).
(4) The plain woven fabric obtained in (3) above was immersed in a hot water bath at 90 ° C. for 30 minutes (bath ratio = 1: 10) in the same manner as in (4) of Example 1 to obtain a fabric. Then, the water-soluble yarn in the composite twisted yarn forming was removed and the fabric was taken out of the hot water bath, washed with hot water at 80 ° C. and dried.
(5) When the elongation rate in the warp direction and the weft direction of the fabric obtained in the above (4) was measured by the method described above, the warp direction elongation rate was 3% and the weft direction elongation rate was 14%. . Further, when the elongation recovery rate in the weft direction of this fabric was measured by the above-mentioned method, it was 75%, and it had good stretchability and kickback property in the weft direction. Moreover, this fabric had completely dissolved and removed the water-soluble yarn, and was excellent in lightness, breathability and texture.

<< Comparative Example 1 >>
(1) The same spun yarn as prepared in (i) of Example 1 [twisting number 600 times / m (Z twisted), 100% cotton, 20th spun yarn (“TS20 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.)] Each of the same water-soluble yarns [ethylene-vinyl alcohol copolymer multifilament yarn (56 dtex) (dissolved in water at 80 ° C.)] produced in Example (ii) was used. Supplying to the same twisting machine used in (iii), twisted together so that the number of twists (upper twist) was 150 times / m (Z twist) to produce a composite twisted yarn (twisted number of composite twisted yarn) = 0.25 times the number of twists of the spun yarn) Thereafter, the obtained composite twisted yarn was subjected to water vapor (80 ° C.) for 30 minutes using the same vacuum setting machine used in (1) of Example 1. After heat treatment, it was removed from the vacuum setting machine.
(2) A yarn of a predetermined length (1 m) is cut out from the composite twisted yarn obtained in (1) above to obtain a sample yarn, and the spun yarn and water-soluble yarn in the composite twisted yarn in the same manner as in (2) of Example 1 The composite twisted yarn was composed of 84% by mass of spun yarn and 16% by mass of water-soluble yarn.
(3) Weaving a plain weave fabric of warp 25 / cm and weft 22 / cm using a cotton No. 40 double yarn as a warp and using the composite twisted yarn obtained in (2) above as a weft (plain weave fabric) Of 45% of mixed twisted yarn).
(4) The plain woven fabric obtained in (3) above was immersed in a hot water bath at 90 ° C. for 30 minutes (bath ratio = 1: 10) in the same manner as in (4) of Example 1 to obtain a fabric. Then, the water-soluble yarn in the composite twisted yarn forming was removed and the fabric was taken out of the hot water bath, washed with hot water at 80 ° C. and dried.
(5) When the elongation rate in the warp direction and the weft direction of the fabric obtained in the above (4) was measured by the method described above, the stretch rate in the warp direction was 3% and the elongation rate in the weft direction was 7%. Although a twisted yarn was used as the weft, good stretchability was not obtained in the weft direction. Moreover, when the elongation recovery rate in the weft direction of this fabric was measured by the method described above, it was 80%.

<< Comparative Example 2 >>
The same spun yarn as prepared in (i) of Example 1 [twisted number 600 times / m (Z twist), 100% cotton, 20th spun yarn (“TS20 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.)], Example One of each of the same water-soluble yarns [ethylene-vinyl alcohol copolymer multifilament yarn (56 dtex) (dissolved in water at 80 ° C.)] produced in (ii) of Example 1 was obtained in Example (iii). It was supplied to the same twisting machine as that used, and an attempt was made to produce a composite twisted yarn by twisting it so that the twist number (upper twist) was 1000 times / m (Z twist) (twist number of composite twisted yarn = The number of twists of the spun yarn was 1.67 times), the yarn breakage was large, and the twisted yarn was difficult to obtain a composite twisted yarn.

<< Comparative Example 3 >>
(1) (i) Twist number of 350 times / m (Z twist) 100% cotton 10th spun yarn (“TS10 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.), with a twist number of 250 times / m ( A twin yarn was produced by twisting the yarn so as to be S-twisted.
(Ii) Manufactured in the same manner as (ii) of Example 1 using the same twin yarn produced in (i) and the same ethylene-vinyl alcohol copolymer used in (ii) of Example 1. Each one of the water-soluble yarns [ethylene-vinyl alcohol copolymer multifilament yarn (22 dtex) (dissolved in water at 80 ° C.)] was supplied to the same twisting machine used in (iii) of Example 1. The composite twisted yarn was manufactured by twisting so that the twist number (upper twist) was 200 times / m (S twist) (twist number of the composite twisted yarn = 0.80 times the twisted number of the spun yarn).
(2) A yarn of a predetermined length (1 m) is cut out from the composite twisted yarn obtained in (1) above to obtain a sample yarn, and the spun yarn and water-soluble yarn in the composite twisted yarn in the same manner as in (2) of Example 1 The composite twisted yarn was composed of 98.2% by weight of spun yarn and 1.8% by weight of water-soluble yarn.
(3) A plain weave fabric of warp 25 / cm and 13 weft / cm was woven using the No. 40 cotton double yarn as the warp and the composite twisted yarn obtained in (2) above as the weft (plain weave fabric) 50% of mixed twisted yarn).
(4) The plain woven fabric obtained in (3) above was immersed in a hot water bath at 90 ° C. for 30 minutes (bath ratio = 1: 10) in the same manner as in (4) of Example 1 to obtain a fabric. Then, the water-soluble yarn in the composite twisted yarn forming was removed and the fabric was taken out of the hot water bath, washed with hot water at 80 ° C. and dried.
(5) When the stretch rate in the warp direction and the weft direction of the fabric obtained in the above (4) was measured by the method described above, the stretch rate in the warp direction was 3% and the stretch rate in the weft direction was 6%. Although a twisted yarn was used as the weft, good stretchability was not obtained in the weft direction. In addition, the elongation recovery rate in the weft direction of this fabric was measured by the method described above and found to be 85%.

<< Comparative Example 4 >>
(1) One twist of 1500 times / m (Z twist), 100% cotton, 120th spun yarn (Royal Textile MIlls LTD. (India) “Royal 120”) and Example 1 (ii) 6 of the same water-soluble yarn [ethylene-vinyl alcohol copolymer multifilament yarn (56 dtex) (dissolved in water at 80 ° C.)] as produced in Example 1 (iii). And then twisted so that the number of twists (upper twist) was 1000 times / m (Z twist) to produce a composite twisted yarn (twisted number of composite twisted yarn = 0.67 of twisted number of spun yarn) Times). Thereafter, the obtained composite twisted yarn was heat-treated with water vapor (80 ° C.) for 30 minutes using the same vacuum setting machine as used in (1) of Example 1, and then taken out from the vacuum setting machine.
(2) A yarn of a predetermined length (1 m) is cut out from the composite twisted yarn obtained in (1) above to obtain a sample yarn, and the spun yarn and water-soluble yarn in the composite twisted yarn in the same manner as in (2) of Example 1 The composite twisted yarn was composed of 13% by mass of spun yarn and 87% by mass of water-soluble yarn.
(3) Weaving a plain weave fabric of warp 25 / cm and weft 20 / cm using the 40th cotton yarn as the warp and the composite twisted yarn obtained in (2) above as the weft (plain weave fabric) Of 45% of mixed twisted yarn).
(4) The plain woven fabric obtained in (3) above was immersed in a hot water bath at 90 ° C. for 30 minutes (bath ratio = 1: 10) in the same manner as in (4) of Example 1 to obtain a fabric. Then, the water-soluble yarn in the composite twisted yarn forming was removed and the fabric was taken out of the hot water bath, washed with hot water at 80 ° C. and dried.
(5) The fabric obtained in the above (4) was unsightly, had no form stability, and had no practical value.

  The above-described Examples 1 to 3 and Comparative Examples 1 to 4 are summarized in Table 1 as shown in Table 1 below.

  As can be seen from the results in Table 1 above, in Examples 1 to 3, a composite twisted yarn in which a spun yarn and a water-soluble yarn are twisted, and the twist direction of the composite twisted yarn is the same as the twisted direction of the spun yarn. The twist number of the twisted yarn is in the range of 0.3 to 1.5 times the twist number of the spun yarn, and the ratio of the spun yarn / water-soluble yarn in the composite twisted yarn is in the range of 98/2 to 20/80 (mass ratio). As a result, a high-quality woven or knitted fabric having high stretchability and excellent kickback property is obtained.

On the other hand, in Comparative Example 1, the number of twists of the composite twisted yarn is 0.25 times the number of twisted spun yarns and less than 0.3 times. The stretchability of the fabric obtained by removing the sex yarn is small.
In Comparative Example 2, since the composite twisted yarn was manufactured such that the number of twists of the composite twisted yarn was 1.67 times greater than the number of twisted yarns of the spun yarn, the yarn breakage occurred frequently. Thus, a composite twisted yarn cannot be manufactured.
In Comparative Example 3, the content ratio of the water-soluble yarn in the composite twisted yarn is 1.8% by mass, which is too small. Therefore, the fabric obtained by removing the water-soluble yarn from the fabric produced using the composite twisted yarn Elasticity is small.
In Comparative Example 4, the content ratio of the water-soluble yarn in the composite twisted yarn is 87% by mass, which is too much. Therefore, the fabric obtained by dissolving and removing the water-soluble yarn from the woven or knitted fabric prepared from the composite twisted yarn is A slippage occurs and the shape stability is inferior, and a practically useful fabric cannot be obtained.

Example 4
(1) The same spun yarn as prepared in (i) of Example 1 [twisting number 600 times / m (Z twisted), 100% cotton, 20th spun yarn (“TS20 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.)] Each of the same water-soluble yarns [ethylene-vinyl alcohol copolymer multifilament yarn (56 dtex) (dissolved in water at 80 ° C.)] produced in Example (ii) was used. The composite twisted yarn of the present invention was manufactured by supplying the same twisting machine as used in (iii) and twisting it so that the number of twists (upper twist) was 400 times / m (Z twist). The number of twists of the twisted yarn = 0.67 times the number of twists of the spun yarn) After that, the obtained composite twisted yarn was subjected to water vapor (80 ° C.) using the same vacuum setting machine used in (1) of Example 1. ) For 30 minutes, and then removed from the vacuum setting machine.施例 was 16 mass% was measured in the same manner as in 1 (2).
(2) The same spun yarn used in (1) above (twist number of 600 times / m (Z twist), 100th cotton, 20th spun yarn (“TS20 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.)), and the above ( 1) Each of the same water-soluble yarns [ethylene-vinyl alcohol copolymer multifilament yarns (56 dtex) (dissolved in water at 80 ° C.)] used in 1) are twisted into a twisting machine (Murata Kikai “36M”). Supply and twist it so that the number of twists (upper twist) is 1000 turns / m (S twist) to produce composite twisted yarn (composite twisted yarn whose twist direction is opposite to the twist direction of spun yarn) The content ratio of the water-soluble yarn in this composite twisted yarn was measured in the same manner as in Example 1 (2) and found to be 16% by mass.

(3) Use cotton No. 40 twin yarn as warp and combine one composite twisted yarn of the present invention produced in (1) above and one composite twisted yarn produced in (2) above as one weft. Thus, a plain weave fabric having a warp of 25 / cm and a weft of 22 / cm was woven (mixing ratio of the composite twisted yarn of the present invention of (1) above in the plain weave fabric is 22%). In the weaving process, the plain weave fabric could be woven at high speed without causing any troubles such as yarn breakage, and there was no problem in weaving mass productivity (weaving speed 0.1 m / min).
(4) The plain woven fabric obtained in (3) above was immersed in a hot water bath at 90 ° C. for 30 minutes (bath ratio = 1: 10) in the same manner as in (4) of Example 1 to obtain a fabric. The water-soluble yarns in the composite twisted yarns of (1) and (2) above were dissolved and removed, and then the fabric was taken out of the hot water bath, washed with hot water at 80 ° C., and dried.
(5) When the stretch rate in the warp direction and the weft direction of the fabric obtained in the above (4) was measured by the above method, the stretch rate in the warp direction was 3% and the stretch rate in the weft direction was 16%. . Further, the elongation recovery rate in the weft direction of this fabric was measured by the above method and found to be 72%, and it had good stretchability and kickback properties in the weft direction. Moreover, this fabric had completely dissolved and removed the water-soluble yarn, and was excellent in lightness, breathability and texture.

<< Reference Example 1 >>
(1) One warp No. 40 double yarn was used as the warp, and the combination of the composite twisted yarn obtained in (1) of Example 1 and the cotton No. 30 double yarn at a ratio of 1: 2 A plain weave fabric with a warp of 25 / cm and a weft of 22 / cm was woven as a weft of a book (15% of the mixed twisted yarn in the plain weave fabric).
(2) The plain woven fabric obtained in (1) above was immersed in a hot water bath at 90 ° C. for 30 minutes (bath ratio = 1: 10) in the same manner as in (4) of Example 1 to obtain a fabric. Then, the water-soluble yarn in the composite twisted yarn forming was removed and the fabric was taken out of the hot water bath, washed with hot water at 80 ° C. and dried.
(3) When the elongation rate in the warp direction and the weft direction of the fabric obtained in (2) was measured by the method described above, the stretch rate in the warp direction was 3% and the elongation rate in the weft direction was 7%. . Moreover, when the elongation recovery rate in the weft direction of this fabric was measured by the method described above, it was 80%.

<< Reference Example 2 >>
(1) The same spun yarn as prepared in (i) of Example 1 [twisting number 600 times / m (Z twisted), 100% cotton, 20th spun yarn (“TS20 single yarn” manufactured by Tsuzuki Spinning Co., Ltd.)] Each of the same water-soluble yarns [ethylene-vinyl alcohol copolymer multifilament yarns (56 dtex) (dissolved in water at 80 ° C.)] produced in Example 1 (ii) were twisted into a twisting machine (Murata). Machine "36M") and twisted so that the number of twists (upper twist) is 800 turns / m (S twist), and the twist direction of the composite twisted yarn is opposite to the twisted direction of the spun yarn (The number of twists of the composite twisted yarn = 1.33 times the number of twists of the spun yarn) The content ratio of the water-soluble yarn in this composite twisted yarn was measured in the same manner as in (2) of Example 1. It was 16% by mass.
(2) A plain weave fabric of warp 25 / cm and weft 22 / cm was woven using the No. 40 cotton double yarn as the warp and the composite twisted yarn produced in (1) above as the weft. Of 45% of mixed twisted yarn).
(3) The plain woven fabric obtained in the above (2) was immersed in a hot water bath at 90 ° C. for 30 minutes (bath ratio = 1: 10) in the same manner as in (4) of Example 1 to obtain a fabric. Then, the water-soluble yarn in the composite twisted yarn forming was removed and the fabric was taken out of the hot water bath, washed with hot water at 80 ° C. and dried.
(4) When the stretch rate in the warp direction and the weft direction of the fabric obtained in the above (3) was measured by the method described above, the stretch rate in the warp direction was 3% and the stretch rate in the weft direction was 23%. . In addition, the elongation recovery rate in the weft direction of this fabric was measured by the method described above and found to be 42%. The plain woven fabric after dissolving and removing the water-soluble yarn thus obtained was extremely excellent in stretchability, but the elongation recovery rate was not high and the kickback property was insufficient.

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 and removed, so that it has excellent stretchability and excellent kickback that shrinks to its original state when released from the stretched state, and feel, texture, lightness, breathability, etc. Since a fabric having excellent properties can be obtained, the composite twisted yarn of the present invention can be effectively used for producing the stretchable fabric described above.
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 excellent stretchability and good kickback property, Taking advantage of its excellent texture, feel, lightness, breathability, etc., sports clothing, underwear, foundations, other clothing, medical applications such as elastic bandages, vehicle interior materials, belt conveyor fabrics, and other industries It can be used effectively in a wide range of fields such as materials.

Claims (6)

  A composite twisted yarn obtained by twisting a spun yarn and a water-soluble yarn, wherein the twist direction of the composite twisted yarn is the same as the twisted direction of the spun yarn, and the twist number of the composite twisted yarn is 0.3 to 1. A composite twisted yarn having a mass ratio of 5: 5 and a spun yarn: water-soluble yarn content in the composite twisted yarn of 98: 2 to 20:80.   The water-soluble yarn is a yarn comprising fibers obtained by melt spinning an ethylene-vinyl alcohol copolymer having a degree of polymerization of 200 to 500 and containing 5 to 15 mol% of a structural unit derived from ethylene. Item 2. A composite twisted yarn according to Item 1.   The composite twisted yarn according to claim 1 or 2, wherein the spun yarn is a spun yarn comprising natural cellulosic fibers.   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 any one of claims 1 to 3.   The woven fabric according to claim 4, wherein 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 any one of claims 1 to 3 at a ratio of 20% by mass or more. knitting. After heat-treating the composite twisted yarn according to any one of claims 1 to 3, a woven or knitted fabric is prepared using the heat-treated yarn, and the water-soluble yarn is dissolved and removed from the woven or knitted fabric with water, so that the water-soluble yarn is not included. A method for producing a woven or knitted fabric.