JP2022104847A - Conjugate yarn, and woven or knitted fabric - Google Patents

Abstract

To provide a woven or knitted fabric hard to generate thread breakage, fuzz, and crease, and provided with elasticity appropriate to a woven or knitted fabric, excellent kickback property (stretch-back property), and the like.SOLUTION: A method of producing a woven or knitted fabric having elasticity include: winding a sheath yarn A around a water-soluble yarn as a core yarn by a predetermined number of times, and further winding a sheath yarn B around the same by a predetermined number of times with a winding direction reverse to the winding direction of the sheath yarn A to form a covering-formed conjugate yarn; weaving or knitting-processing the conjugate yarn to form a woven or knitted fabric; and solving and removing the core yarn of the woven or knitted fabric, where the winding direction of the sheath yarn A which is wound around the core yarn is the same direction as a firstly twisting direction of the sheath yarn A, and the winding direction of the sheath yarn B is the same direction as a firstly twisting direction of the sheath yarn B so that first twisting of the sheath yarn A and the sheath yarn B forms a repeatedly additionally twisted conjugated yarn by a predetermined number of times, then the repeatedly additionally twisted conjugate yarn is weaving or knitting-processed to form the woven or knitted fabric, and the core yarn of the woven or knitted fabric is solved and removed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a composite yarn and a woven or knitted fabric using the composite yarn. More specifically, the water-soluble yarn is used as the core yarn, and a plurality of filament yarns or spun yarns are used as the sheath yarns. The present invention relates to a composite yarn provided with the above, and a woven and knitted fabric having elasticity woven and knitted using the composite yarn.

As a technique for imparting elasticity using spun yarn, composite plying, which is a combination of spun yarn and polyurethane elastic yarn, is widely used. However, polyurethane elastic yarns require special equipment and high technology when handling yarns and weaving and knitting. Further, the polyurethane elastic yarn has a problem that it is liable to deteriorate with time due to heat, light or the like.

Therefore, in Patent Document 1 below, a technique for manufacturing a composite twisted yarn capable of obtaining a woven or knitted fabric having high elasticity without using a polyurethane elastic yarn and having excellent characteristics such as light weight, flexibility, and texture. Is disclosed.

The technique described in Patent Document 1 uses a spun yarn and a water-soluble yarn in a specific mass ratio, and twists both yarns in a twisting direction opposite to the twisting direction (lower twist) of the spun yarn. A specific composite twisted yarn is manufactured by setting the ratio of the number of twists of the spun yarn to the number of twists when twisting both yarns in a specific range. Then, a woven or knitted fabric is made from the composite twisted yarn obtained thereby, and the water-soluble yarn in the woven or knitted yarn is dissolved in water and removed.

According to the technique described in Patent Document 1, since the yarn length of the spun yarn is longer than that of the water-soluble yarn, elasticity is obtained by that length after the water-dissolving treatment, and the water-soluble yarn is further dissolved. A gap is created in the fabric, and a force for further shrinking the thread is generated to fill the gap, and as a result, high elasticity is imparted to the fabric. As a result, the fabric is fluffy, has a good feel and texture, and is also excellent in properties such as light weight and breathability.

Similar to the technique described in Patent Document 1 below, the technique described in Patent Document 2 has high elasticity without using polyurethane elastic yarn, and has characteristics such as light weight, flexibility, and texture. Also discloses a technique for manufacturing composite yarns that can obtain excellent woven and knitted fabrics.

The technique described in Patent Document 2 newly manufactures a composite twisted yarn by twisting two or more spun yarns and a water-soluble yarn in a direction opposite to the twisting direction of the spun yarns using two or more spun yarns. Then, a woven or knitted fabric is made using this composite twisted yarn, and the water-soluble yarn in the woven or knitted yarn is dissolved and removed with water.

According to the technique described in Patent Document 2, when a composite twisted yarn is manufactured by setting the number of spun yarns to be twisted with a water-soluble yarn to two or more, the number of twists when producing the composite twisted yarn is set to one spun yarn. Even if the number of plyed yarns is reduced as compared with the case of producing composite twisted yarns from water-soluble yarns, it is possible to obtain composite twisted yarns having excellent handleability and strength during knitting and weaving, and the number of twists when producing composite twisted yarns is reduced. As a result, the plying efficiency at the time of manufacturing the composite plying is improved and the productivity is increased.

The technique described in Patent Document 3 uses a water-soluble fiber such as a polyvinyl alcohol-based fiber as a core yarn, and spirally winds a raw yarn or a silk yarn as a sheath yarn, and further reverses the winding direction. Then, the covering yarn is formed by laminating and winding a plurality of layers, and then the covering yarn is scoured or dyed at a temperature higher than the melting temperature of the water-soluble fiber to melt the water-soluble fiber of the core yarn. It relates to a method of manufacturing silk processed yarn by doing so.

According to the technique described in Patent Document 3, a plurality of layers of silk thread are spirally wound to form a hollow shape, and the winding direction of each of the overlapped layers is formed in the opposite direction, so that the silk thread has less elasticity. It is possible to increase the elasticity of the silk thread and make it possible to diversify the knitting pattern. In addition, the knitted fabric obtained by knitting and weaving using this silk-processed yarn retains the luster of silk, is excellent in bulkiness and weight reduction, has a soft texture, and manufactures silk knitted fabrics for various purposes. You can do it.

Here, the technique described in Patent Document 1 twists a spun yarn and a water-soluble yarn in a twisting direction opposite to the twisting direction of the spun yarn, and at that time, twists the number of twists of the spun yarn and both yarns. A specific composite twisted yarn is manufactured by setting the ratio of the number of twists to a specific range, and the technique described in Patent Document 2 uses two or more spun yarns to produce the two yarns. The above-mentioned spun yarn and water-soluble yarn are twisted in the direction opposite to the twisting direction of the spun yarn to produce a composite twisted yarn.

That is, both the technique described in Patent Document 1 and the technique described in Patent Document 2 manufacture a composite plyed yarn by twisting a spun yarn and a water-soluble yarn. Here, twisting means twisting and twisting the yarn, and the composite twisted yarn is a twisted yarn.

When the spun yarn and the water-soluble yarn are strongly twisted (twisted), so-called fins such as entanglement and entanglement of the spun yarn occur. Further, there is a problem that so-called curl such as winding or rounding of the spun yarn occurs. Composite twisted yarns having the characteristics of fins and curls have a problem that defects such as yarn breakage, fluff, and streaks occur during the production of woven and knitted fabrics, and productivity does not increase and a good woven fabric cannot be produced.

The technique described in Patent Document 3 uses a water-soluble fiber such as polyvinyl alcohol fiber as a core yarn, and spirally winds raw yarn or silk yarn as a sheath yarn, and further reverses the winding direction on this. The covering yarn is formed by laminating and winding a plurality of layers. Therefore, when the spun yarn and the water-soluble yarn are strongly twisted (twisted) as in the techniques described in Patent Document 1 and Patent Document 2, problems such as entanglement and entanglement of the spun yarn occur. Is few.

However, according to the technique described in Patent Document 3, although it is possible to produce a stretchable silk processed yarn and a stretchable silk fabric made of the silk processed yarn, a woven or knitted fabric having a larger elasticity or elasticity is available. However, it is not possible to manufacture a woven or knitted fabric with elasticity that meets various needs, such as a woven or knitted fabric with a soft texture that has little elongation, or a woven or knitted fabric with a moderate elasticity and a soft texture. There is a problem. Woven and knitted fabrics have different required characteristics depending on their use. For example, towels are required to absorb water more than anything else, underwear is required to be soft and breathable, and work clothes are required to have elasticity and stretch back properties. There is a demand for composite yarns having different elasticity according to needs.

Patent No. 4393357 Patent No. 4431083 Patent No. 3190314

Therefore, the subject of the present invention is a composite yarn that is less likely to cause defects such as yarn breakage, fluff, and streaks, has elasticity according to needs, has excellent kickback property (stretchback property), and is soft to the touch and has an improved texture. To provide. Another object of the present invention is to provide a woven or knitted fabric having elasticity, a soft texture, kickback property, and water absorption according to needs.

In order to solve the above problems, in the first invention, a water-soluble yarn is used as a core yarn, and a sheath yarn A which becomes a sheath of the core yarn is wound a predetermined number of times in the S direction or the Z direction, and the sheath of the core yarn is wound. The sheath yarn B to be wound is wound on the sheath yarn A a predetermined number of times with the winding direction opposite to that of the sheath yarn A, and the sheath yarn A and the sheath yarn B are in the form of a covering yarn. It's a thread
The winding direction of the sheath yarn A wound around the core yarn and the lower twisting direction of the sheath yarn A are the same twisting direction, and the winding direction of the sheath yarn B wound around the core yarn and the said It is a composite yarn characterized in that the lower twisting direction of the sheath yarn B is the same twisting direction, so that the number of lower twists of the sheath yarn A and the sheath yarn B are both additional twisted by the predetermined number of times. ..

A water-soluble yarn is used as a core yarn, and by winding (covering) the sheath yarn A in the S direction or the Z direction and the sheath yarn B in the opposite direction of A (covering), the twist torque in the S direction and the twist torque in the Z direction are wound. Is canceled out and no twist torque is generated in the composite yarn. By reversing the winding (covering) directions of the two spun yarns wound around the core yarn, it is possible to provide a composite yarn with less generation of fins and curls.

The winding direction of the sheath thread A wound around the core thread and the lower twisting direction of the sheath thread A are the same twisting direction, and the winding direction of the sheath thread B wound around the core thread and the said When the lower twist direction of the sheath thread B is the same as the lower twist direction, the twist of the sheath thread can be made stronger (additional twist). The composite yarn in which the twist of the sheath yarn is strengthened (additionally twisted) contracts greatly due to the dissolution and removal of the water-soluble yarn, and expands greatly when stretched. For the production of a woven or knitted fabric (fabric) that requires high elasticity, a composite yarn that is covered so that the lower twists of the sheath yarn A and the sheath yarn B are additionally twisted is suitable.

On the other hand, the winding direction of the sheath yarn A wound around the core yarn and the lower twisting direction of the sheath yarn A are opposite twisting directions, and the sheath yarn B wound around the core yarn B. By setting the winding direction of the sheath yarn B and the lower twisting direction of the sheath yarn B to be opposite to each other, the twisting of the sheath yarn can be weakened (untwisted). The composite yarn in which the twist of the sheath yarn is weakened (untwisted) is slightly stretched by the dissolution and removal of the water-soluble yarn. A woven or knitted fabric using such a composite yarn is suitable for a woven or knitted fabric having a soft texture rather than elasticity.

The winding direction of the sheath yarn A wound around the core yarn and the lower twisting direction of the sheath yarn A are the same twisting direction, and the winding direction of the sheath yarn B wound around the core yarn. The lower twisting direction of the sheath yarn B is the opposite twisting method, or the winding direction of the sheath yarn A wound around the core yarn and the lower twisting direction of the sheath yarn A are opposite twisting directions. By setting the winding direction of the sheath yarn B wound around the core yarn and the lower twisting direction of the sheath yarn B to be the same twisting direction, the sheath yarn A is twisted or untwisted, and the sheath yarn B is untwisted. Alternatively, a twisted composite yarn can be obtained. As a result, for the production of woven knits (fabric) with appropriate elasticity and soft texture when stretched, a composite yarn covered so that one sheath yarn is twisted and the other sheath yarn is untwisted is suitable. be.

In order to solve the above problem, in the second invention, a water-soluble yarn is used as a core yarn, a sheath yarn A is wound around the core yarn a predetermined number of times, and the winding direction is set to the opposite direction of the sheath yarn A. By winding the sheath yarn B a predetermined number of times to form a composite yarn in a covering form, the composite yarn is processed into a woven or knitted fabric to form a woven or knitted fabric, and the core yarn of the woven or knitted fabric is dissolved and removed with water. In the method of manufacturing elastic woven and knitted fabrics
The winding direction of the sheath yarn A to be wound around the core yarn is the same as the lower twisting direction of the sheath yarn A, and the winding direction of the sheath yarn B is the same as the lower twisting direction of the sheath yarn B. As a result, the lower twists of the sheath yarn A and the sheath yarn B both form the additional / additional twist composite yarn in which the additional twist is performed a predetermined number of times.
The sheath yarn A and the sheath yarn B obtained by winding the sheath yarn A and the sheath yarn B a predetermined number of times by processing the weaving and knitting with the additional and twisting composite yarn to produce a woven and knitted yarn and dissolving and removing the water-soluble yarn. It is a method for producing a woven or knitted fabric, which is characterized by producing a woven or knitted fabric having elasticity obtained by increasing the yarn length and the twisting effect of the sheathed yarn A and the sheathed yarn B.

As described above, when the core yarn of the composite yarn obtained by winding (covering) the sheath yarn so as to be twisted around the core yarn which is a water-soluble yarn is dissolved and removed, the twisting effect of the sheath yarn causes. The composite yarn from which the core yarn has been removed contracts greatly, and when tension is applied to this, the yarn length is greatly extended due to the twisting effect and the covering effect. A woven or knitted fabric produced of a composite yarn having such characteristics is obtained by increasing the yarn lengths of the sheath yarn A and the sheath yarn B by winding the sheath yarn A and the sheath yarn B a predetermined number of times and the twisting effect of the sheath yarn A and the sheath yarn B. It has elasticity to be applied.

When the core yarn of the composite yarn obtained by winding (covering) the core yarn, which is a water-soluble yarn, so as to be untwisted, is melted and removed, the core yarn is removed by the untwisting effect of the sheath yarn. The length of the composite yarn is increased due to the untwisting effect of the sheath yarn. When tension is applied to this, the split yarn length of the covering effect is extended. A woven or knitted fabric produced of a composite yarn having such characteristics is obtained by increasing the yarn lengths of the sheath yarn A and the sheath yarn B by winding the sheath yarn A and the sheath yarn B a predetermined number of times and the twisting effect of the sheath yarn A and the sheath yarn B. It has elasticity, flexibility, and a fluffy texture.

A composite yarn obtained by winding (covering) the core yarn, which is a water-soluble yarn, so that the sheath yarn A is additionally twisted (covering), and winding (covering) the sheath yarn B so as to be untwisted. When the core yarn of No. 1 is dissolved and removed, the additional twisting effect of the sheath yarn works more predominantly than the untwisting effect and contracts slightly. A woven or knitted fabric produced by a composite yarn having such characteristics can produce a woven fabric (fabric) having appropriate elasticity and a soft texture.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings of the examples. FIG. 1 is a schematic diagram for producing a composite yarn according to an embodiment of the present invention. While the core thread (water-soluble thread) was pulled up in the bobbin 11 direction of the sheath thread A by the winding bobbin 13, the sheath thread A was wound (covered) in the Z direction, and the sheath thread A was wound. The sheath yarn B is wound (covered) in the S direction around the core yarn (water-soluble yarn) to produce a composite yarn. In this embodiment, the spun yarn is used for the sheath yarn A and the sheath yarn B, but a filament yarn may be used instead of the spun yarn.

In the present specification, the winding direction (covering direction) when winding the sheath yarn around the water-soluble yarn is referred to as upper twist, and the twisting direction of the sheath yarn is referred to as lower twist. If the lower twist of the spun yarn A, which is the sheath yarn, is in the Z direction, the upper twist is in the Z direction, so the upper twist and the lower twist are in the same direction, and the twist of the spun yarn A is added (additionally twisted). If the lower twist of the spun yarn A is in the S direction, the twist is untwisted (untwisted). In the present specification, the stronger bottom twist (the number of lower twists increases) is called additional twist, and the weaker lower twist (the number of lower twists decreases) is called untwisting. Hereinafter, the same applies to the spun yarn B.

If the lower twist of the spun yarn B is in the S direction, the spun yarn B is covered with the core yarn in the S direction, so that the spun yarn B is additionally twisted. Since the spun yarn A is twisted and the spun yarn B is also twisted, the covering form is twisted and twisted. This is referred to as additional / additional twist in the present specification. The number of coverings of the composite yarn to the core yarn means the number of times the sheath yarn (spun yarn, filament yarn) is wound around the core yarn (water-soluble yarn).

The sheath yarn wound around the core yarn is a spun yarn made of heavenly twisted fibers such as hair, cotton, hemp and silk. The sheath yarn may be any yarn formed from fibers that are insoluble in water (hot water). For example, 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, recycled fiber such as rayon and cupra, It may be either a single sheath yarn made of one kind of fiber selected from natural twisted fibers such as wool, cotton, linen and silk, or a blended sheath yarn made of two or more kinds of the above-mentioned fibers.

The number of coverings is preferably 0.2 to 3 times, more preferably 0.5 to 2 times, the number of coverings of the composite yarn is 0.2 to 3 times the number of twists of the spun yarn (the number of twists of the lower twist). It is preferable to set the number of twists according to the use of the woven or knitted fabric. As the water-soluble yarn, a yarn that dissolves in water (hot water) at a temperature up to the boiling temperature of water (about 100 ° C) under atmospheric pressure is a water-soluble yarn from a woven or knitted fabric produced from the composite yarn of the present invention. It is preferable from the viewpoint of ease of removal and handleability when it is dissolved and removed with water.

Examples of the fibers constituting the water-soluble yarn include water-soluble polyvinyl alcohol-based fibers, water-soluble ethylene-vinyl alcohol-based copolymer fibers, and water-soluble polyamide fibers. Among them, water-soluble polyvinyl alcohol-based fibers and water-soluble ethylene vinyl alcohol-based copolymer fibers are preferable from the viewpoints of high solubility in water (hot water), biodegradability, and availability.

The thickness of the water-soluble yarn is 31 dtex to 2200 dtex, especially 110 dtex to 660 dtex, from the ease of twisting with the sheath yarn, the strength of the composite yarn, the reduction of spun fluff, and the woven and knitted fabric formed from the composite yarn. It is preferable from the viewpoints of ease of dissolving and removing the water-soluble yarn and imparting elasticity to the fabric after dissolving the water-soluble yarn. The ratio of the sheath yarn and the water-soluble yarn in the composite yarn of the present invention, and whether to cover the additional / additional twist, untwisting / untwisting, additional / untwisting, or unwound / additional twist is a woven or knitted product. It is preferable to make adjustments according to the intended use, the type of spun yarn, the type of water-soluble yarn, and the like.

In general, if the number of coverings to be applied is small, the elasticity of the composite yarn and the woven or knitted fabric obtained from the composite yarn is low, while if it is too large, the force of the sheath yarn to shrink becomes too strong. As a result, yarn breakage occurs frequently during covering, making it difficult to obtain the composite yarn of the present invention, and even if the composite yarn is obtained, the processability during knitting and knitting tends to be poor.

In FIG. 2, a water-soluble yarn 100 is used as a core yarn, and a spun yarn 110 is wound around the core yarn in the Z direction (counterclockwise) (covering: FIG. 2A), and the spun yarn 120 is used as a sheath yarn. Is wound in the S direction (clockwise) (covering: FIG. 2 (b)), and is a schematic diagram showing that the composite yarn of the present invention is formed by these. In the winding (covering) shown in FIG. 2, since the winding directions of the spun yarn 110 and the spun yarn 120 are opposite, the twisting torque of the composite yarn generated by the covering is offset. As a result, it is possible to obtain a composite yarn having less curl, such as so-called fins such as entanglement and entanglement of yarns, and winding and rounding of spun yarns.

FIG. 3 is a diagram illustrating the strength of the twist generated in the sheath yarn depending on the direction of the lower twist and the covering of the spun yarn which is the sheath yarn. The sheath yarn is made by twisting a bundle of fibers and putting them together, and twisting in either the S direction or the Z direction occurs as a bottom twist. When the yarn is covered in the same direction as the lower twist direction of the spun yarn, the twist of the sheath yarn (spun yarn) is additionally twisted to become a strongly twisted sheath yarn (spun yarn). In the strongly twisted spun yarn, the twisted fibers are tightened and densely packed, the yarn becomes thin and hard, and the twisted yarn shrinks. On the contrary, when it is covered in the opposite direction to the lower twist of the sheath yarn (spun yarn), it is untwisted, the fibers are unwound and plump, the yarn becomes thicker and weaker, and the weak twist that stretches as much as the twist is untwisted. It becomes a sheath yarn (spun yarn).

A feature of the present invention is to provide a composite yarn having elasticity according to needs and a woven or knitted fabric using such a composite yarn. Here, the factors that change the elasticity of the composite yarn are factor 1: the yarn length of the sheath yarn wound per unit length of the core yarn, and factor 2: the twist strength of the sheath yarn (strength of the lower twist). S), two.

FIG. 4 is a diagram illustrating the above-mentioned factor 1: the difference in elongation due to the difference in the yarn length of the sheath yarn wound per unit length of the core yarn. As shown in FIG. 4A, the yarn length of the sheath yarn wound around the core yarn having the same diameter increases as the number of windings (the number of coverings) increases. Therefore, as shown in FIG. 4 (b), when a certain tension is applied to the composite yarn from which the core yarn has been melted and removed (the core yarn is no longer fixed), the number of times of winding (the number of times of covering) is large. The longer the thread length (stretches).

FIG. 5 shows the yarn of the composite yarn due to the above-mentioned factor 2: the twisting effect and the untwisting effect caused by the combination of the twisting (lower twisting) direction of the sheath yarn 110 and the winding direction (upper twisting direction: covering direction). It is the figure which showed the length change. The additional / additional twisted composite yarn, in which both sheath yarns are wound (covered) in the direction of additional twisting, shrinks significantly due to the additional twisting effect of the sheath yarn when the core yarn is melted and removed.
The unwound / untwisted composite yarn wound (covered) in the direction in which both sheath yarns are untwisted is stretched by the untwisting effect of the sheath yarn when the core yarn is melted and removed. The additional / untwisted composite yarn, which is wound (covered) in the direction in which one of the sheath yarns is twisted and the other in the direction in which the other is untwisted, is a composite yarn of the sheath yarn when the core yarn is melted and removed. The twisting effect works more predominantly than the untwisting effect and shrinks slightly.

6 to 8 are views showing changes in the yarn length of the composite yarn due to the effects of the above-mentioned factors 1 and 2 and the characteristics of the woven fabric manufactured by using the composite yarn. FIG. 6 shows the characteristics of a woven fabric in which a spun yarn 110 is additionally twisted to cover a core yarn 100 as a sheath yarn, and a composite yarn covered by a twisting is also used as a weft for the spun yarn 120 which is a sheath yarn. It is a figure. As shown in FIG. 6A, the composite yarn covered by additional / additional twisting has a large elasticity as shown in FIG. 5A when the core yarn 100 of the water-soluble yarn is melted. When the water-soluble core yarn 100 is melted from a woven fabric woven using such a composite yarn, the composite yarn contracts and the width contracts (the original width of 82 cm is 57 cm: −29%) as shown in FIG. 6 (b). By pulling the woven fabric in the contracted state in the lateral direction, it is possible to make a woven fabric (fabric) having a high elasticity, that is, it expands to the width of the woven fabric or more.

FIG. 7 shows the characteristics of a woven fabric in which a spun yarn 110 is twisted and covered with a core yarn 100 as a sheath yarn, and a composite yarn covered with a twist is also used as a weft for the spun yarn 120 which is a sheath yarn. It is a figure. As shown in FIG. 7 (a), the composite yarn covered by unwinding and untwisting has a yarn length due to the untwisting effect of the sheath yarn as shown in FIG. 7 (a) when the core yarn 100 of the water-soluble yarn is melted. Grow. When the water-soluble core yarn 100 is melted from the woven fabric woven using such a composite yarn, the fabric is stretched by the amount of the untwisted sheath yarn as shown in FIG. 7 (b) (the original width of 82 cm is 88 cm: 7%). ). When pulled in the weft direction, the fabric stretches further due to the covering effect. You can make a fabric with a soft and fluffy texture.

FIG. 8 is a diagram showing the characteristics of a woven fabric in which a spun yarn 110 is additionally twisted as a sheath yarn on a core yarn 100, and the spun yarn 120, which is a sheath yarn, is woven using a composite yarn covered by untwisting as a weft. Is. As shown in FIG. 8A, in the composite yarn covered by additional twisting and untwisting, when the core yarn 100 of the water-soluble yarn is melted, the spun yarn in the additional twisting direction is twisted as shown in FIG. 8A. Shrinks by the amount of. When the water-soluble core yarn 100 is melted from a woven fabric woven using such a composite yarn, the spun yarn in the twisting direction of the composite yarn contracts as shown in FIG. 8 (b) (the original width of 82 cm is 78 cm: -5). %). When the woven fabric in the contracted state is pulled in the weft direction, the fabric stretches by the amount of shrinkage due to twisting and the effect of covering. It is possible to make woven fabrics (fabrics) with moderate elasticity and soft texture.

As described above, by combining the lower twist direction and the covering direction of the sheath yarn, a woven or knitted fabric (fabric) having desired elasticity can be produced. Moreover, the woven and knitted fabrics obtained from such composite yarns have many advantages such as high water absorption and good touch to the skin, and by taking advantage of these properties, they can be used for medical purposes such as sports clothing, underwear, other clothing, and elastic bandages. It can be effectively used for vehicle interior materials and other industrial materials. On the other hand, there is a problem that the restoring force after stretching is inferior. Therefore, as the sheath yarn of the composite yarn having high durability and elasticity, the use of synthetic fibers such as polyester filament yarn having heat setting property can be mentioned. By using a filament yarn having a heat-setting property for the sheath yarn, the fabric woven with the composite yarn according to the present technique can have a restoring force and a highly durable elasticity.

The elasticity of the plain weave fabric produced in the following examples was tested. The test pieces used for the test were a test piece with a warp length of the fabric of 300 mm (length) and a weft direction of 50 mm (width), and a test piece with a warp direction of 50 mm and a weft direction of 300 mm (width). ) Was collected from each of the three test pieces. "JIS L1096: 2010 8.16.1 Elongation rate A method (constant speed elongation method)" was used to measure the elongation rate. The test piece is subjected to a tensile tester, and the initial load is the load (N) (value up to an integer) corresponding to gravity applied to the width of the test piece to a length of 1 m, and the upper and lower grip intervals of the test piece are 20 cm. The tensile tester was attached and the tensile test was performed at a tensile speed of 200 mm / min. Then, from the obtained load and the elongation curve, the elongation rate (%) under a 14.7 N load was obtained three times using a mathematical formula, Ep (elongation rate%) = (L1-L0) / L0 × 100, and the elongation rate (%) was obtained three times. The average value was taken as the growth rate (%).
Ep: Growth rate%
L0: Length of test piece (200 mm)
Length of test piece when a load of L1: 14.7N is applied

(Example 1)
The first embodiment is a test on the elasticity of the spun yarn (sheath yarn) in the same direction (additional twist / additional twist) in the lower twisting direction and the covering direction. As the water-soluble yarn of the core, polyvinyl alcohol multifilament yarn 660dtex (dissolved in water at 55 ° C. or higher) (manufactured by Nichibi Co., Ltd.) was used.

As the sheath yarn A and the sheath yarn B, spun yarns having a count of 20 cotton yarns and a twist number of 760 times / m in the S direction and the Z direction were used. Using the above water-soluble yarn as the core yarn, the spun yarn with the lower twist in the S direction and the Z direction is supplied to the covering machine, respectively, and the number of turns is 400 times / m, and the lower twist is the spun yarn in the S direction (sheath yarn). A) is covered in the S direction, and the spun yarn (sheath yarn B) whose lower twist is in the Z direction is covered in the Z direction (in the additional twist direction), and the number of twists is 1160 times / m (S / Z twist). Manufactured a strong twist double covering yarn.

The composite yarn obtained from this was used as a warp and a weft, and a plain woven fabric having 11 warp / cm and 8 weft / cm was woven by a rapier weaving machine. The plain weave fabric was immersed in hot water at 55 ° C. or higher for 30 minutes (bath ratio 1:30) to dissolve and remove the water-soluble threads forming the plain weave fabric, and then the plain weave fabric was taken out of the water and dried. .. When the elongation rate in the warp direction and the weft direction of the plain weave fabric thus obtained was measured by the above method, the elongation rate in the vertical direction was 40% and the elongation rate in the weft direction was 35%. It became a plain weave fabric with.

(Example 2)
The second embodiment is a test on the elasticity of the spun yarn (sheath yarn) in the opposite direction (untwisting / untwisting) between the lower twisting direction and the covering direction. As the water-soluble yarn of the core, polyvinyl alcohol multifilament yarn 660dtex (dissolved in water at 55 ° C. or higher) was used.

As the sheath yarn A and the sheath yarn B, a spun yarn having a cotton yarn count of 20 and a twist number of 760 times / m in the S direction and the Z direction was used. Using the water-soluble yarn as the core yarn, the spun yarn with the lower twist in the S direction and the Z direction is supplied to the covering machine, respectively. In the untwisting direction), the spun yarn having the lower twist in the Z direction was covered in the S direction (untwisting direction) to produce a untwisted composite yarn having a twist number of 360 times / m.

The composite yarn thus obtained was used as warp and weft, and a plain weave fabric having 11 warp / cm and 8 weft / cm was woven by a rapier loom. The plain weave fabric is immersed in hot water at 55 ° C. or higher for 30 minutes (bath ratio 1:30) to dissolve and remove the water-soluble yarn in the composite yarn forming the fabric, and then the fabric is taken out from the water. It was dry.

When the elongation rate in the warp direction and the weft direction of the obtained dough was measured by the above method, the elongation rate in the vertical direction was 12% and the elongation rate in the weft direction was 11%. Although the elongation rate was low in the covering in the untwisting direction, the yarn was untwisted, resulting in a soft and fluffy fabric.

(Example 3)
Example 3 is a test on the elasticity of the spun yarn (sheath yarn) in the same / opposite direction (additional / untwisting) in the lower twisting direction and the covering direction. The core thread and sheath thread are the same as those in Examples 1 and 2.
Using this water-soluble yarn as the core yarn, the sheath yarn A and the sheath yarn B whose lower twist is in the S direction are supplied to the covering machine, respectively, and the number of turns is 400 times / m, and the lower twist is the sheath yarn in the S direction. A is covered in the S direction, and the sheath yarn B in the S direction is covered in the Z direction, and the number of twists is 1160 times / m (S twist) and 360 times / m (S twist). A composite yarn in the untwisting direction was manufactured.

The composite yarn thus obtained is used as a warp and a weft, and a plain weave fabric having 11 warps / cm and 8 wefts / cm is woven on a rapier loom, and the obtained plain weave fabric is placed in hot water at 55 ° C. or higher. The water-soluble yarn in the double covering yarn forming the dough was dissolved and removed by immersing the dough in water for 30 minutes (bath ratio 1:30), and then the dough was taken out of water and dried. When the elongation rate in the warp direction and the weft direction of the plain woven fabric thus obtained was measured by the above method, the elongation rate in the vertical direction was 25% and the elongation rate in the weft direction was 34%. The fabric has both elasticity in the twisting direction and soft texture in the untwisting direction.
(Example 4)

Example 4 is a test on the number of turns of the covering and the elasticity. The downward twisting direction of the spun yarn (sheath yarn) and the covering direction were set to be the same direction. The specifications of the core thread, the sheath thread A, and the sheath thread B used are the same as those in the first to third embodiments.

Using this water-soluble yarn as a core yarn, spun yarns with lower twists in the S and Z directions are supplied to the covering machine, and the number of turns is 200 times / m, 400 times / m, and 600 times / m, respectively. The sheath yarn A whose twist is in the S direction is covered in the S direction (additional twisting direction), and the sheath yarn B whose lower twist is in the Z direction is covered in the Z direction (additional twisting direction), and the number of twists is 960 times / m. Strongly twisted composite yarns having 1160 times / m and 1360 times / m were produced.

Using the composite yarn having a winding number of 400 times / m as a warp and the composite yarn having a winding number of 200 times / m, 400 times / m, and 600 times / m as the weft, respectively, A plain weave fabric with a warp of 11 threads / cm and a weft of 8 threads / cm was woven on a rapier loom.

The obtained plain woven fabric is immersed in hot water at 55 ° C. or higher for 30 minutes (bath ratio 1:30) to dissolve and remove the water-soluble yarns of the composite yarn forming the plain woven fabric, and then the plain woven fabric is watered. Removed from and dried. When the elongation rate in the weft direction of the plain weave fabric thus obtained was measured by the above method, it was 28% when the number of windings of the weft was 200 times / m, and 35% when the number of windings was 400 times / m. When the number of turns was 600 times / m (S / Z twist), it was 50%. As the number of turns of the covering was increased, the elongation rate of the dough was increased.

(Comparative example)
As a comparative example, the expansion / contraction rate using a general cotton thread as a weft was tested. The specifications of the core yarn and the sheath yarn of the warp were the same as those used in Examples 1 to 4, and the spun yarn (sheath yarn) in the S direction and the Z direction was used with the number of twists being 760 times / m.

For the warp, the water-soluble yarn is used as the core yarn, and the spun yarn (sheath yarn) with the lower twist in the S direction and the Z direction is supplied to the covering machine, and the number of turns is 400 times / m, and the lower twist is in the S direction. The sheath yarn is covered in the S direction (additional twisting direction), and the spun yarn in which the lower twist is in the Z direction is covered in the Z direction (additional twisting direction). Manufactured.

The obtained composite yarn is used as a warp, and a cotton yarn 20 count twin yarn is used as a weft to weave a plain weave fabric having 11 warps / cm and 8 wefts / cm on a rapier loom, and the obtained plain weave fabric is 55. The water-soluble yarn of the composite yarn forming the plain weave fabric was dissolved and removed by immersing the fabric in hot water at ° C. or higher for 30 minutes (bath ratio 1:30), and then the fabric was taken out from the water and dried. When the elongation rate in the weft direction of the obtained dough was measured by the above method, the elongation rate was 5%. The result was that the elongation rate was low in the fabric using general cotton yarn.

It is a figure which shows typically an example of the apparatus which manufactures the composite yarn of this invention. A water-soluble yarn is used as a core yarn, and a sheath yarn is wound around the core yarn in the Z direction (counterclockwise), and the sheath yarn B is wound in the S direction (clockwise), whereby the composite yarn of the present invention is formed. Is a diagram schematically showing. It is a figure explaining the strength of the twist generated in the sheath yarn by the direction of the lower twist of the sheath yarn and the covering. It is a figure explaining the difference in elongation by the number (the number of windings) of covering a sheath yarn with a core yarn. It is a figure which showed the yarn length change of the composite yarn by the combination of the twisting (lower twisting) direction of the sheath yarn 110, and the winding direction (upper twisting direction: covering direction). It is a figure which showed the characteristic of the woven fabric which weaved by twisting the sheath yarn A to the core yarn, and wefting the composite yarn which also covered the sheath yarn B by the additional twist. It is a figure which showed the characteristic of the woven fabric which weaved by untwisting the sheath yarn A for the core yarn, and wefting the composite yarn which also covered the sheath yarn B by untwisting. It is a figure which showed the characteristic of the woven fabric which weaved by twisting the sheath yarn A to the core yarn, and using the composite yarn covered by the untwisting as the weft.

10 Water-soluble yarn feeding bobbin 11 Sheath yarn A (covering yarn) feeding bobbin 12 Sheath yarn B (covering yarn) feeding bobbin 13 Winding bobbin 100 Water-soluble yarn A
110 sheath thread B
120 sheath thread C

Claims (9)

The water-soluble yarn is used as the core yarn, the sheath yarn A which becomes the sheath of the core yarn is wound a predetermined number of times in the S direction or the Z direction, and the sheath yarn B which becomes the sheath of the core yarn is on the sheath yarn A. The sheath yarn A and the sheath yarn B are composite yarns in the form of a covering yarn, which are wound a predetermined number of times with the winding direction opposite to that of the sheath yarn A.
The winding direction of the sheath yarn A wound around the core yarn and the lower twisting direction of the sheath yarn A are the same twisting direction, and the winding direction of the sheath yarn B wound around the core yarn and the said A composite yarn characterized in that the number of lower twists of the sheath yarn A and the sheath yarn B is both twisted by the predetermined number of times because the lower twist direction of the sheath yarn B is the same twisting direction. The water-soluble yarn is used as the core yarn, the sheath yarn A which becomes the sheath of the core yarn is wound a predetermined number of times in the S direction or the Z direction, and the sheath yarn B which becomes the sheath of the core yarn is on the sheath yarn A. The sheath yarn A and the sheath yarn B are composite yarns in the form of a covering yarn, which are wound a predetermined number of times with the winding direction opposite to that of the sheath yarn A.
The winding direction of the sheath yarn A wound around the core yarn and the lower twisting direction of the sheath yarn A are opposite twisting directions, and the sheath yarn B wound around the core yarn is wound. A composite yarn characterized in that both the lower twist of the sheath yarn A and the lower twist of the sheath yarn B are disassembled and twisted a predetermined number of times because the direction and the lower twist direction of the sheath yarn B are opposite to each other. The water-soluble yarn is used as the core yarn, the sheath yarn A which becomes the sheath of the core yarn is wound a predetermined number of times in the S direction or the Z direction, and the sheath yarn B which becomes the sheath of the core yarn is on the sheath yarn A. The sheath yarn A and the sheath yarn B are composite yarns in the form of a covering yarn, which are wound a predetermined number of times with the winding direction opposite to that of the sheath yarn A.
The winding direction of the sheath thread A wound around the core thread and the lower twisting direction of the sheath thread A are the same directions, and the winding direction of the sheath thread B wound around the core thread and the sheath. Since the direction of the lower twist of the yarn B is opposite to that of the lower twist direction, the number of lower twists of the sheath yarn A is additionally twisted by the predetermined number of times, and the number of lower twists of the sheath yarn B is disassembled and twisted the predetermined number of times. A composite yarn characterized by. The composite yarn according to any one of claims 1 to 3, wherein the sheath yarn A and / or the sheath yarn B is a spun yarn. The composite yarn according to any one of claims 1 to 3, wherein the sheath yarn A and / or the sheath yarn B is a filament yarn. A woven or knitted product obtained by dissolving and removing the water-soluble yarn with water from a woven or knitted fabric containing the composite yarn according to any one of claims 1 to 5. A water-soluble yarn is used as a core yarn, and a sheath yarn A is wound around the core yarn a predetermined number of times, and the winding direction is reversed from that of the sheath yarn A, and the sheath yarn B is wound a predetermined number of times to cover the covering form. The composite yarn of the above is formed, the composite yarn is woven and knitted to form a woven and knitted fabric, and the core yarn of the woven and knitted fabric is dissolved and removed with water to produce a woven and knitted fabric having elasticity. In the manufacturing method
The winding direction of the sheath yarn A to be wound around the core yarn is the same as the lower twisting direction of the sheath yarn A, and the winding direction of the sheath yarn B is the same as the lower twisting direction of the sheath yarn B. As a result, the lower twists of the sheath yarn A and the sheath yarn B both form the additional / additional twist composite yarn in which the additional twist is performed a predetermined number of times.
The sheath yarn A and the sheath yarn B obtained by winding the sheath yarn A and the sheath yarn B a predetermined number of times by processing the weaving and knitting with the additional and twisting composite yarn to produce a woven and knitted yarn and dissolving and removing the water-soluble yarn. A method for producing a woven or knitted fabric, which comprises producing a woven or knitted fabric having elasticity obtained by increasing the yarn length and the twisting effect of the sheathed yarn A and the sheathed yarn B. A water-soluble yarn is used as a core yarn, and a sheath yarn A is wound around the core yarn a predetermined number of times, and the winding direction is reversed from that of the sheath yarn A, and the sheath yarn B is wound a predetermined number of times to cover the covering form. The composite yarn of the above is formed, the composite yarn is woven and knitted to form a woven and knitted fabric, and the core yarn of the woven and knitted fabric is dissolved and removed with water to produce a woven and knitted fabric having elasticity. In the manufacturing method
The winding direction of the sheath yarn A to be wound around the core yarn is opposite to the lower twisting direction of the sheath yarn A, and the winding direction of the sheath yarn B is opposite to the lower twisting direction of the sheath yarn B. As a result, the lower twists of the sheath yarn A and the sheath yarn B both form the unwound / untwisted composite yarn that has been disassembled and twisted a predetermined number of times.
The sheath yarn A and the sheath yarn B obtained by winding the sheath yarn A and the sheath yarn B a predetermined number of times by processing the knitting and knitting with the unwound and untwisted composite yarn to produce a woven and knitted yarn and dissolving and removing the water-soluble yarn. A method for producing a woven or knitted fabric, which comprises producing a woven or knitted fabric having elasticity obtained by increasing the yarn length and the twisting effect of the sheath yarn A and the sheath yarn B. A water-soluble yarn is used as a core yarn, and a sheath yarn A is wound around the core yarn a predetermined number of times, and the winding direction is reversed from that of the sheath yarn A, and the sheath yarn B is wound a predetermined number of times to cover the covering form. The composite yarn of the above is formed, the composite yarn is woven and knitted to form a woven and knitted fabric, and the core yarn of the woven and knitted fabric is dissolved and removed with water to produce a woven and knitted fabric having elasticity. In the manufacturing method
The winding direction of the sheath yarn A to be wound around the core yarn is the same as the lower twisting direction of the sheath yarn A, and the winding direction of the sheath yarn B is the opposite direction to the lower twisting direction of the sheath yarn B. As a result, the lower twist of the sheath yarn A is twisted by the predetermined number of times, and the lower twist of the sheath yarn B is disassembled and twisted by the predetermined number of times to form a composite yarn of additional and untwisted.
The sheath yarn A and the sheath yarn B obtained by winding the sheath yarn A and the sheath yarn B a predetermined number of times by processing the weaving and knitting with the compound yarn of the additional and untwisting to produce a woven and knitted yarn and dissolving and removing the water-soluble yarn. A method for producing a woven or knitted product, which comprises producing a woven or knitted fabric having elasticity obtained by increasing the yarn length, the twisting effect of the sheath yarn A, and the untwisting effect of the sheath yarn B.

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