JP2022128631A - Covering yarn using core yarn composed of bamboo fiber as main constituent, and production method of the same - Google Patents

Abstract

To provide a covering yarn constituted by winding a sheath yarn around a core yarn.SOLUTION: A core yarn 2 contains a bamboo fiber. A covering yarn covers the core yarn 2 by winding a sheath yarn 3 composed of a yarn having no bamboo fiber to prevent bamboo fuzz of the bamboo fiber of the core yarn 2 from coming up to the surface.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a covering yarn using a blended yarn containing bamboo fiber as a core yarn, and a method for producing the same.

Bamboo is distributed in areas with a warm and humid climate, and there are many areas in Japan called bamboo forests where bamboo grows in colonies. Therefore, many products using bamboo as a raw material are known. It is used in various fields such as fishing tools. Bamboo grows quickly, so bamboo as a raw material is cheap, and bamboo products are provided at a relatively low cost, and its uses seem limitless.

On the other hand, instead of using bamboo as it is as a raw material, a blended yarn obtained by extracting fibers from the bamboo and using these fibers has been conventionally known.
The "bamboo fiber-containing fiber product" disclosed in Japanese Patent Laid-Open No. 2007-277746 has a soft texture, does not easily give the skin a scratchy feel, and is also excellent in hygroscopicity. It is preferable that the fiber product is made using spun yarn containing natural bamboo fiber, and is a fiber product containing bamboo fiber that has been treated with cellulase, and particularly that has been subjected to a kneading treatment.
That is, fabrics woven and knitted using blended yarns containing bamboo fibers have a problem that they have a tingling sensation when they come into contact with the skin, depending on the mixing ratio of the bamboo fibers.

The "bamboo fiber sheet" according to JP-A-2014-136851 is a sheet with improved strength and rigidity regardless of the beating degree of bamboo fiber.
That is, among bamboo fibers obtained by defibrating bamboo, strand-like bamboo fibers having a fiber thickness exceeding 0.3 [mm] and containing vascular bundles on the outer skin side, and bamboo fibers having a thickness of 0.3 [mm] or less It has a fiber thickness and includes a pulp-like bamboo fiber containing a vascular bundle on the inner skin side, and is constituted by integrally blending the strand-like bamboo fiber and the pulp-like bamboo fiber.

In this way, fabrics woven and knitted using blended yarns mixed with bamboo fibers have a tingling sensation when they come into contact with the skin, depending on the mixing ratio of bamboo fibers. It is necessary to remove the bamboo fluff that has been removed later.
Therefore, it is necessary to remove the bamboo fluff generated in the secondary processing of the finished woven and knitted fabric, which increases the work process and increases the manufacturing cost of the woven and knitted fabric.
On the other hand, removing the bamboo fluff formed on the surface of the woven or knitted fabric eliminates or at least suppresses the tingling sensation, but reduces the weight ratio of the contained bamboo fibers.

FIG. 9 is an enlarged view showing a blended yarn (a) containing bamboo fibers, and countless fine bamboo fluffs (b), (b), . . . are formed around the blended yarn (a). . This bamboo fluff (b), (b) occurs on the surface of the woven and knitted fabric when the blended yarn (a), (b) is used for weaving and knitting, and this bamboo fluff (b) , (b) .
10 and 11 are also enlarged views showing similar blended yarn (a) containing bamboo fiber.
"Bamboo fiber-containing fiber product" according to JP-A-2007-277746 "Bamboo fiber sheet" according to JP-A-2014-136851

Fabrics woven and knitted using blended yarns containing bamboo fibers in this way have been conventionally known. However, depending on the bamboo fiber content, when wearing clothes made from this fabric, a slight tingling sensation remains. In order to eliminate this tingling sensation, it is possible to subject the finished woven and knitted fabric to secondary processing (post-treatment), but there are problems as described above.
The problem to be solved by the present invention is to solve this problem, and to provide a covering yarn capable of covering the bamboo fluff formed at the yarn stage so as not to surface. Also provided is a method for producing the covered yarn.

The covering yarn according to the present invention is constructed by winding the sheath yarn around the outer circumference of the core yarn, and the bamboo fluff formed around the outer circumference of the core yarn can be covered by the sheath yarn wound around the outer circumference.
The following forms are mainly conceivable for the covering yarn.
(1) The most basic form in which a core yarn mainly composed of bamboo fibers is covered with sheath yarns made of fibers other than bamboo.
(2) A configuration in which the sheath yarn is double-covered on the core yarn. In this case, the main component of the core thread is not limited to bamboo fiber, and bamboo fiber can be used as the sheath thread.
(3) As the core yarn, it is also possible to use stretchable fibers such as polyurethane, polyester, nylon, natural rubber, and synthetic rubber.
(4) A water-soluble fiber is used as the sheath yarn, and at least a part of the wound sheath yarn can be dissolved by immersing it in water after completing the covering yarn. Alternatively, the sheath yarn can be removed by immersing the cloth woven and knitted with the covering yarn in water.
(5) A heat-fusible fiber may be used as the sheath yarn, and the wound sheath yarn may be removed by immersing it in a heated liquid after completing the covering yarn. In this case, it is also possible to leave a part of the sheath yarn fused to the surface of the core yarn without completely removing the wound sheath yarn.
By the way, the sheath yarn is wound around the spun (twisted) core yarn, but the winding process of the sheath yarn is not separated from the twisting process of the core yarn. It is also possible to

As the core yarn, a blended yarn composed mainly of bamboo fiber or a yarn composed only of bamboo fiber is used, and the sheath yarn to be wound is covered with cotton yarn or the like. Further, the core yarn is not limited to a blended yarn containing bamboo fibers, and may be made of a stretchable fiber such as polyurethane. In other words, the configuration of the core yarn that constitutes the covering yarn and the specific configuration of the sheath yarn that is wound around the covering yarn are not limited.

On the other hand, it is also possible to use a thread having bamboo fibers as the sheath yarn to be wound around the core yarn. In order to cover it, it is necessary to wrap a sheath thread that does not contain bamboo fiber around it. The form of the covering is not limited to a single winding, and a double covering can be used.

A water-soluble thread is sometimes used as the sheath thread wound around the core thread. That is, the water-soluble sheath yarn is dissolved when the woven fabric is soaked in water, and the bamboo fiber content of the fabric is maintained.
By the way, although the number of times the sheath yarn is wound around the core yarn is not limited, it is generally 100 to 5000 times per meter. In addition, the hardness with which the sheath thread is wound is also free.

The bamboo fiber-containing blended yarn according to the present invention has the unique functionality of bamboo, that is, excellent strength, antibacterial action, and antioxidant action, which are inherent in natural bamboo fiber, by blending with other fibers such as cotton. It is possible to produce a textile product which has deodorizing and soundproofing effects and which has no problem in texture and dyeability.
The blended yarn is a yarn obtained by mixing bamboo fiber and cotton fiber, and contains natural bamboo fiber at a weight ratio of 15% to 85%.
Here, if the blend ratio of bamboo fiber is increased, the functionality inherent to bamboo is improved, but on the other hand, the difficulty of producing the blended yarn increases.

The method of manufacturing the blended yarn is not limited and is free, but for example, it is manufactured through a blending process, a blending process, a carding process, a drawing process, a roving process, a spinning process, a winding process, and the like.
Bamboo fibers with an average fiber length of 15 mm to 70 mm and an average diameter of 30 microns to 70 microns are used by defibrating, and these bamboo fibers are mixed with cotton fibers and the like.
The fiber length of the cotton fiber and the like mixed with the bamboo fiber is about 40 mm on average, but if short fiber is used, it is not easy to intertwine with the bamboo fiber.

By defibrating, dry-distilling, and blasting bamboo fibers, it is possible to obtain a blended yarn that maintains its functionality, ie, odor absorption, adsorption, antibacterial properties, etc., at a higher level. Defibrillation, dry distillation, and blasting mean processing under heat and pressure conditions (for example, 5 to 6 atmospheres, 140 to 200 ° C.). of oil, water, insects, etc. are removed. After defibration, dry distillation, and blasting, the lignin contained in the bamboo becomes polyphenols, which not only enhances the antioxidant effect, but also increases the porosity, making the odor absorption, adsorption, and antibacterial effects more pronounced. .

The covering yarn according to the present invention has a structure in which a blended yarn mixed with bamboo fiber is used as a core yarn, and a sheath yarn is wound around the core yarn. Therefore, the bamboo fluff generated around the core yarn is covered by winding the sheath yarn, and there is no bamboo fluff around the covering yarn, and at least the generation of bamboo fluff is suppressed.
Therefore, the surface of the fabric woven and knitted using the covering yarn has less bamboo fuzz, and therefore, even if the clothes using the fabric are worn, the user does not feel itchy.
When the covering yarn is used for weaving and knitting, the bamboo fibers are covered with the sheath yarn, so that the bamboo fibers hardly fall off during the manufacturing process. Therefore, the weight ratio of the bamboo fiber contained in the woven fabric is kept substantially constant, and the fabric having a predetermined quality can be provided.

Furthermore, by covering the sheath yarn around the core yarn, the thickness is made uniform. That is, the thickness of the blended yarn is not constant due to the inclusion of bamboo fibers, and the cross section is not circular but distorted, but by winding the sheath yarn, the cross section becomes circular and the thickness is uniform. . Therefore, the fabric woven and knitted using the uniform covering yarn has a clean fabric surface without irregularities on the surface.

On the other hand, it is not limited to the case where bamboo fiber is contained as the core yarn, and it is also possible to use a blended yarn having bamboo fiber as the sheath yarn to be wound around. It is possible to prevent the bamboo fiber from falling off by winding the sheath thread.
Woven and knitted fabrics using blended yarn containing bamboo fibers have about twice the strength of fabrics made only of cotton yarn. The lignin in the material is thermally decomposed into phenol, which has an antioxidant effect.

The antibacterial action inherent in bamboo, especially against Staphylococcus aureus, is particularly remarkable. In addition, the fabric woven with covering yarn prevents the bamboo fibers from falling off, so there is almost no deterioration in antibacterial and deodorant properties due to washing, and it has antioxidant, antibacterial and deodorizing effects. It is especially useful for demanding fabrics.

FIG. 2 is a schematic diagram showing the covering yarn according to the present invention, in which the sheath yarn is wound around the core yarn. FIG. 2 is a schematic diagram showing the double covered yarn according to the present invention, in which the sheath yarn is wound around the core yarn. FIG. 3 is an external view showing the double covered yarn according to the present invention, in which the sheath yarn is wound around the core yarn. FIG. 3 is an external view showing the double covered yarn according to the present invention, in which the sheath yarn is wound around the core yarn. FIG. 3 is an external view showing the double covered yarn according to the present invention, in which the sheath yarn is wound around the core yarn. 1 is an external view showing a double covering yarn according to the present invention, in which a water-soluble sheath yarn is wound around a core yarn. FIG. 1 is an external view showing a double covering yarn according to the present invention, in which a water-soluble sheath yarn is wound around a core yarn. FIG. 1 is an external view showing a double covering yarn according to the present invention, in which a water-soluble sheath yarn is wound around a core yarn. FIG. FIG. 2 is an external view showing a blended yarn containing bamboo fibers, with countless bamboo fluffs occurring around it. FIG. 2 is an external view showing a blended yarn containing bamboo fibers, with countless bamboo fluffs occurring around it. FIG. 2 is an external view showing a blended yarn containing bamboo fibers, with countless bamboo fluffs occurring around it.

The covering yarn according to the present invention is configured by winding the sheath yarn around the core yarn, and the wound sheath yarn can cover the bamboo fluff generated from the bamboo fibers constituting the core yarn so that it does not surface. .
The thread containing bamboo fiber is not necessarily limited to the core thread, but it is used as a sheath thread to be wound, and another sheath thread may be wrapped around the sheath thread. can be covered. After weaving and knitting as a cloth, the bamboo fluff formed on the surface of the cloth is not removed by secondary processing as in the conventional method.

Fabrics made using the covered yarn of the present invention have a wide variety of uses. For example, bed sheets, duvet covers, pillowcases, towels, woven cloths, carpets, curtains used in hospitals and hotels. It can be used for various products such as underwear, car seats, and parasols.

FIG. 1 is a schematic diagram showing a covering yarn 1 according to the present invention, where 2 represents a core yarn and 3 represents a sheath yarn. Here, the specific types of the core yarn 2 and the sheath yarn 3 are not limited, but the core yarn 2 is generally a blended yarn containing bamboo fiber, and the sheath yarn 3 does not contain bamboo fiber. Yarns composed of other fibers are used.
A core yarn 2 containing bamboo fibers has a large number of bamboo fluffs around it, and the bamboo fluffs can be covered with a sheath yarn 3 wound around.

Here, the number of windings of the sheath yarn 3 is 100 to 5000 times per 1 m, the winding hardness is 25 to 101%, and the elongation rate of the core yarn 2 is 72 to 800%. , the covering is performed under suitable conditions depending on the types of the core yarn 2 and the sheath yarn 3 to be wound and the application of the covering yarn.

FIG. 2 is a schematic diagram showing the double covering yarn 4. As shown in FIG. In the figure, 2 represents a core thread, and 5a and 5b represent sheath threads. One sheath thread 5a is wound around the core thread 2, and the other sheath thread 5b is wound around the wound sheath thread 5a. .
Here, as the core yarn 2, a blended yarn containing bamboo fiber is used, like the covering yarn 1 shown in FIG. can do

By the way, there are various specific yarns that constitute the double covering yarn 4, and the core yarn 2 is not limited to a blended yarn containing bamboo fiber.
For example, a bamboo fiber-containing blended yarn can be used as the sheath yarn 5a wound around the outer circumference of the core yarn 2, and a bamboo fiber-free yarn can be used as the sheath yarn 5b wound around the outer circumference. By winding the sheath yarn 5b, it is possible to suppress the bamboo fluff generated from the bamboo fibers of the sheath yarn 5a.

In addition, a thread such as polyurethane having excellent elasticity is used as the core thread 2, a sheath thread 5a containing bamboo fiber is wound around the core thread 2 made of polyurethane, and cotton thread or the like is further wound around the sheath thread 5a. It is possible to cover the sheath thread 5b that suppresses the bamboo fluff.
On the other hand, the core yarn 2 is a blended yarn containing bamboo fiber, and the sheath yarns 3, 5a, 5b wound around the core yarn 2 are water-soluble yarns. If the fabric woven using the covering yarns 1, 4 is soaked in water, the water-soluble sheath yarns 3, 5a, 5b will dissolve in the water and flow, resulting in the weaving of only the core yarn. Knitted fabric.

3, 4 and 5 are specific examples showing the double covering yarn 4 according to the present invention.
Even if the sheath yarns 5a and 5b are used for covering, bamboo fluff 6, 6... formed on the core yarn 2 is generated in the vicinity of the sheath yarns 5a and 5b. However, it can be seen that the number of bamboo fluffs 6, 6, . . .

Therefore, in the fabric woven and knitted using the covering yarn containing bamboo fiber, the bamboo fluff extending from the bamboo fiber is suppressed from appearing on the surface of the fabric, and the clothes made using the woven and knitted fabric are itchy. You can wear it without Therefore, it is cool and suitable as a thread for underwear that does not irritate the skin.
In addition, when the covering yarn is woven and knitted, it is possible to weave and knit the cloth according to the regulation without dropping the bamboo fiber and reducing the ratio of the bamboo fiber in the entire cloth.

By the way, in the case of the covering yarn 1 shown in FIG. 1, by winding the sheath yarn 3 around the core yarn 2 containing bamboo fibers, the bamboo fluff of the bamboo fibers constituting the core yarn 2 is covered so as not to surface. can do If the covering yarn 1 is used for weaving and knitting, the bamboo fluff does not come off during the weaving and knitting process, and a predetermined weight is maintained. That is, the weight ratio of bamboo fibers contained in the woven fabric does not decrease.
When the woven and knitted fabric is soaked in water, the water-soluble sheath yarn 3 is dissolved and removed, resulting in a woven and knitted fabric composed only of the core yarn 2 containing bamboo fiber.

On the other hand, instead of the water-soluble sheath yarn 3, it is also possible to use the sheath yarn 3 made of heat-sealable nylon fibers. The heat-sealable nylon fibers are melted by being immersed in a liquid at 110° C., and a part of them can be fused to the core yarn 2 .
Therefore, if a part of the sheath yarn 3 made of nylon fiber is fused to cover the bamboo fluff, and the covering yarn 1 is used for weaving and knitting, the bamboo fluff will fall off during the weaving and knitting process. Predetermined weight is maintained without That is, the weight ratio of bamboo fibers contained in the woven fabric does not decrease.
Of course, after weaving and knitting, it is also possible to remove the sheath yarn 3 by soaking the woven and knitted fabric in a liquid at 110°C.
6, 7, and 8 are external views showing the double covering yarn according to the present invention, showing a specific example in which a water-soluble sheath yarn is wound around the core yarn.

The covering yarns 1 and 4 are wound with the sheath yarns 3, 5a and 5b after the core yarn 2 is spun (twisted). By the way, the winding process of the sheath yarns 3, 5a, 5b can be performed simultaneously without being separated from the spinning process. By performing the spinning process and the covering process at the same time, it is possible to significantly reduce the number of processing steps.

1 covering yarn 2 core yarn 3 sheath yarn 4 double covering yarn 5 sheath yarn 6 bamboo fluff

Claims (9)

In the covering yarn configured by winding the sheath yarn around the core yarn, the core yarn contains bamboo fibers, and in order to suppress the surface of the bamboo fluff provided in the bamboo fibers of the core yarn, A covering yarn characterized by covering a core yarn by winding a sheath yarn composed of yarn having no bamboo fiber. 2. The covering yarn according to claim 1, which has a sheath yarn wound clockwise and a sheath yarn wound counterclockwise around the core yarn. 3. The covering yarn according to claim 1, wherein the sheath yarn wound around the core yarn is a water-soluble yarn. 2. The sheath yarn wound around the core yarn is composed of a heat-fusible fiber that can be melted at least partly by being immersed in a heated liquid and the remainder can be fused around the core yarn. , or the covering yarn according to claim 2. In the covering yarn configured by winding the sheath yarn around the core yarn, the sheath yarn containing the bamboo fiber is wound around the core yarn, and the bamboo fiber is wrapped around the wound sheath yarn. A covering yarn characterized by being covered by winding a sheath yarn composed of a yarn having no bamboo fiber in order to suppress the bamboo fluff from coming to the surface. 6. The covering yarn according to claim 5, wherein the core yarn is a stretchable yarn composed of polyurethane, polyester, nylon, natural rubber, synthetic rubber, or the like. In the method of producing a covering yarn by winding a sheath yarn around a core yarn containing bamboo fibers, a water-soluble yarn is wound around the core yarn as the sheath yarn, and after winding the sheath yarn, the yarn is soaked in water to form a sheath. A method for producing a covered yarn, characterized by removing the yarn by dissolving it. In the method of manufacturing a covering yarn by winding a sheath yarn around a core yarn containing bamboo fibers, a heat-fusible yarn is wound as the sheath yarn, and then the sheath yarn is soaked in a heated liquid and wound. A method for producing a covering yarn in which at least one part is melted and the other part is fused around a core yarn to cover bamboo fluff. A method for producing a covered yarn by winding a sheath yarn around a core yarn containing bamboo fibers, wherein the core yarn is twisted and the sheath yarn is wound at the same time.

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