JPH09302545A - Spun yarn having multi-layered structure, hollow fiber obtained therefrom, production thereof and woven or knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a spun yarn having a multi-layered structure having an innermost layer, a middle layer and an outermost layer and of which innermost or middle layer is constituted by a solvent-based PVA fiber capable of being removed by a dissolution, and providing a woven or a knitted fabric excellent in light weightiness, heat insulating property and soft feeling, and having a bulkiness, a flexibility and a pilling resistant property. SOLUTION: This spun yarn having a multi-layered structure has an innermost layer, a middle layer and an outermost layer and of which innermost or middle layer is constituted by a solvent-based PVA fiber capable of being removed by a dissolution. Further, by removing the solvent-based PVA fiber in the spun yarn having the multi-layered structure, e.g. a hollow spun yarn having 25-50% void ratio is obtained. Also, it is preferable to produce a pilling resistant woven or knitted fabric by using this hollow spun yarn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spun yarn having a multi-layer structure capable of providing a bulky woven or knitted fabric which is lightweight and excellent in heat retention, softness, stretchability and anti-pill property, and a hollow spun yarn obtained from the spun yarn. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, there has been a demand for a lightweight woven or knitted fabric having good heat retention and hygroscopicity. To obtain such a woven or knitted fabric, it is preferable to use spun yarn using hollow fibers.
No. 535, etc. Further, as hollow spun yarn, JP-A-60-119248 and JP-A-4-10 are available.
It is proposed in Japanese Patent No. 8131, Japanese Patent Laid-Open No. 6-935131, and the like.

[0003]

However, when the hollow fiber is used, there is a problem that the hollow shape is apt to be destroyed in the process of forming the spun yarn and the performance is not sufficiently exhibited. If the hollow ratio is lowered, the hollow shape is easily retained, but in this case, performances such as lightness and heat retention become insufficient. Furthermore, it is possible to adopt a method in which the central part of the fiber is removed to make a hollow fiber after the woven or knitted product is manufactured, but the quality of the woven or knitted product, especially the performance such as light weight, heat retention, hygroscopicity, and anti-pill property is sufficient. It wasn't. An object of the present invention is to provide a spun yarn having a multi-layer structure capable of providing a woven or knitted fabric which is lightweight and has excellent flexibility, bulkiness, heat retention, elasticity and pill resistance, and a hollow spun yarn and a woven or knitted fabric obtained therefrom. It is what

[0004]

That is, the present invention is characterized in that it has an innermost layer, an intermediate layer and an outermost layer, and that the innermost layer or the intermediate layer is composed of a solvent-based PVA fiber capable of being dissolved and removed. And a solvent-based PV obtained by subjecting the multilayer spun yarn to a dissolution treatment.
It is a hollow spun yarn in which the A fiber is removed and a substantially hollow portion is formed in the central portion of the spun yarn or in the intermediate portion between the outermost layer and the innermost layer.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The hollow spun yarn according to the present invention has a hollow portion formed substantially in the center of the spun yarn or in the intermediate portion between the outermost layer and the innermost layer. For example, the one as shown in FIG. And, as is clear from the figure, when the center of the spun yarn is a hollow portion,
The outermost layer and the intermediate layer form a spun yarn sheath. The hollow rate is preferably 10 to 60%, and particularly preferably 25 to 50%. The term "hollowness of spun yarn" as used in the present invention means the total cross-sectional area of the fiber portion and the hollow portion in the transverse cross section of the spun yarn, S1, the cross-sectional area of the hollow portion (excluding the hollow portion formed in the single fiber). Is S2, it means a value (%) represented by the formula S2 / S1 × 100. Therefore, it is clearly distinguished from the hollow ratio of hollow fibers (the area ratio of the hollow portion in the cross section of the single fiber). A normal spun yarn has a porosity of about 20% or less without intentionally forming a hollow portion. In order to actually produce a hollow spun yarn, in addition to the hollow portion that can be completely dissolved and removed, a component that can also be dissolved can be mixed in the sheath portion. In manufacturing a hollow spun yarn, it is usual to add the raw materials in a weight ratio, and the hollow ratio and the porosity of the whole spun yarn can be estimated by the ratio.

By forming a hollow portion in the spun yarn,
Excellent properties such as lightness, heat retention, and elasticity can be obtained. Especially, by using a solvent-based PVA fiber for the innermost layer or the intermediate layer of the fiber layer constituting the hollow spun yarn, 80 ° C
It can be easily dissolved and removed with the following water. Further, by using the anti-pill PET fiber as the main fiber constituting the outermost layer, the surface of the woven or knitted fabric looks good and has a dry feeling, and further, the effect of further excellent hygroscopicity and quick drying can be obtained. The multi-layer structure here means that the sheath portion of the spun yarn is composed of a plurality of fiber layers (the outermost layer and the intermediate layer) and / or there is a hollow portion between the innermost layer and the outermost layer of the spun yarn. The total number of fiber layers constituting the spun yarn is 2
Say more than that. Therefore, in the present invention, the outermost layer and the innermost layer may each be composed of a plurality of fiber layers.

The spun yarn of the present invention can be prepared, for example, from hydrophilic fibers such as polyvinyl alcohol fibers, rayon, cotton, silk,
The hygroscopicity / water absorption can be improved by using natural fibers such as hemp and wool and the like and hydrophobic fibers having hygroscopicity / water absorption. In addition, hygroscopicity / water absorption can be adjusted by mixing hydrophobic fibers. Further, by mixing the binder fibers, the shape stability of the hollow portion can be enhanced, and a plurality of spun yarns can be integrated. It is preferable to appropriately select and use the kind of fibers constituting the fiber layer, denier and the like according to the purpose. By forming the fiber layer in multiple layers, various performances that cannot be obtained in a single layer can be imparted. The number of layers may be set appropriately, but two layers are preferable from the viewpoint of processability and cost.

The multilayer spun yarn of the present invention can be produced, for example, by a conventional technique for producing spun yarn except that a layer made of solvent-based PVA fiber and preferably an outermost layer are provided with an anti-pill fiber layer. . For example, as shown in FIG. 2, it is obtained by first producing a normal core-sheath composite spun yarn (primary composite spinning), and then producing a core-sheath composite spun yarn using the composite yarn as a core component. (Secondary composite spinning). When increasing the number of layers, the same operation may be repeated. In the case of producing a hollow spun yarn having a hollow portion in the center of the spun yarn (when the innermost layer is composed of a soluble fiber), the removal treatment may be carried out after the production of the multilayer spun yarn. Even if the innermost layer of the core-sheath type composite yarn obtained by the composite spinning is removed to produce a hollow spun yarn, and then the core-sheath type composite yarn containing the hollow spun yarn as a core component (secondary composite spinning) good.
However, a more preferable method is to manufacture the spun yarn, go through a weaving / knitting process, and then hollow it by a dyeing process. Thereby, an excellent product can be obtained. The core-sheath composite spun yarn may have a multi-core structure. Such a core-sheath type composite yarn can be manufactured by an ordinary method. For example, after supplying the core-sheath components separately and passing them through a mixed-wadding process and a carding process to adjust to a predetermined core-sheath ratio, after arranging the core component in the center and the sheath components on both sides thereof, It can be obtained by supplying and drafting, spinning the obtained sliver as it is, and spinning.
In addition, the core-sheath components are separately supplied to form slivers, the spin rate is set according to the desired core-sheath ratio, the core component is placed in the center, and the sheath component is placed around it. (Or by supplying one roving yarn of the core component and one roving yarn of the sheath component one by one), and spinning the roving yarn of the core component in advance and spinning the sheath component. At this time, the spun yarn of the core component may be supplied from the front roller. Even if the core component is a filament, it can be spun similarly. When a filament is used for the core, it is less compatible with the staple portion of the sheath as compared with the core staple, and it is difficult to form a neat hollow portion in the core portion. Therefore, in such a case, it is necessary to use staples for the core.

Further, the fibers constituting the outermost layer are used as pre-sliver, and are fed to both sides of the component to be the intermediate layer in the kneading step, appropriately drafted into roving in the roving construction, and then in the spinning step. A three-layer structure yarn can be obtained by drafting and twisting. Alternatively, the roving yarn serving as the middle layer is provided in the center, and the roving yarn having the component serving as the outermost layer is provided on both sides to the spinning, and the multi-filament or monofilament is directly attached to the front roller of the roller part in which the two-layer structured yarn is spun. The yarn may be supplied to obtain a three-layer structure yarn. Next, the spun yarn may be continuously supplied to a hot roller and subjected to a constant length heat treatment, and then the innermost layer or the intermediate layer may be removed to form a hollow spun yarn, but in terms of the shape stability of the hollow portion and the production cost, first, It is advantageous to weave and knit the multi-layered structure yarn and then subject it to constant length heat treatment before removing the soluble fibers. In particular, it is preferable to carry out a constant length heat treatment before subjecting the woven or knitted product to post-treatment such as purification and dyeing. In this case, excellent morphological stability of the hollow portion can be obtained.

As the staples of water-soluble polyvinyl alcohol (PVA), there are fibers produced by using water as a solvent (water-based fibers) and fibers produced by using an organic solvent as a solvent (solvent-based fibers). It was obtained as a result of research based on the finding that the latter can obtain a better spun yarn. because,
Water-based fiber with good water solubility (dissolved at 60 ℃)
In order to make the soybeans, a state in which a large amount of Glauber's salt adhered to the fibers was inevitable, and during spinning, spinning was significantly impaired. Therefore, at present, only types that can be dissolved in hot water at 80 to 90 ° C. have been commercialized. However, since solvent-based fibers can be manufactured without using Glauber's salt at all, it has been impossible to operate at 80 ° C.
The following fibers which can be easily dissolved in water and have good spinnability can be obtained. As a result,
The problem that it is difficult to dissolve and takes a long time when dissolved and the problem that residual meal is generated is solved, and an excellent hollow spun yarn suitable for the initial purpose can be obtained.

The solvent-based PVA fiber referred to in the present invention has a dissolution temperature (T ° C.) in water of 0 to 100 ° C. and a maximum shrinkage ratio in water of 2
A water-soluble PVA-based fiber having a tensile strength of 0% or less, a tensile strength of 3 g / d or more, an ash content of 1% or less, and a dimensional change rate S% at 20 ° C. and a relative humidity of 93% satisfying the following formula: 0 ≦ T ≦ 50 When S ≦ 6− (T / 10) 50 <T ≦ 100 S ≦ 1 Further, as a method for producing such a fiber, a PVA-based polymer having a dissolution temperature in water of 100 ° C. or lower is dissolved in an organic solvent. The spinning solution obtained is wet-spun or dry-wet spun in a solidifying bath mainly composed of an organic solvent having solidifying ability with respect to the polymer (hereinafter abbreviated as solidifying solvent), and spinning is carried out to obtain a yarn.
~ 8 times wet drawing is performed, the undiluted solvent is extracted from the fiber by the solidifying solvent, dried, and if necessary, dry heat drawn,
Next, at 3 to 4 at 80 to 250 ° C. and under multi-step temperature rising conditions.
Water-soluble PVA obtained by performing 0% dry heat shrinkage treatment
It is a system fiber.

The polymer which can be used in the present invention is a PVA type polymer which is soluble in water at 0 to 100 ° C. after being formed into fibers. Pure PVA in which the PVA-based polymer is composed of 100% vinyl alcohol units is not preferable because the crystallinity after fiberization is too high to obtain the fiber soluble in water at 0 to 100 ° C. of the present invention. Particularly when it is desired to obtain a fiber that is soluble in water at 0 to 60 ° C., in the case of so-called partially saponified PVA that is composed of vinyl acetate units other than vinyl alcohol units, the saponification degree is less than 96 mol%, that is, vinyl acetate. The unit is preferably 4 mol% or more. However, when the saponification degree is 0.8 mol% or less, adhesion between the obtained fibers occurs, the crystallinity of the polymer in the obtained fibers is low, and dimensional stability under high humidity cannot be obtained. When it dissolves in water, it shrinks greatly and the fiber of the present invention cannot be obtained.

When it is desired to obtain a fiber soluble in water at 60 to 100 ° C., it is preferable to use a PVA polymer containing 96 mol% or more of vinyl alcohol unit. For example, when partially saponified PVA is used, it is preferable to use one having a saponification degree of 99.5 mol%. When PVA having a saponification degree of 99.5 mol% or more is used, crystallization proceeds during dry heat drawing and heat shrinkage, and the dissolution temperature in water tends to exceed 100 ° C., which is not preferable.

So-called modified PVA containing units other than vinyl alcohol units and vinyl acetate units
When it is desired to obtain a fiber having a dissolution temperature in water of less than 60 ° C. using a base polymer, when the modifying unit is a unit having a large crystallization inhibiting effect, a modified PVA-based polymer of about 0.5 mol% is used. However, there are cases where it can be suitably used in the present invention, but it is generally preferable to use a PVA-based polymer modified by 1 mol% or more, particularly 2 mol% or more. Similarly, when using a modified PVA-based polymer to obtain a fiber having a melting temperature in water of 60 to 100 ° C, the modification is 2
It is preferable to use one having a content of less than mol%, preferably 0.1 mol% or more and 1.0 mol% or less.

Examples of the modifying unit include ethylene, allyl alcohol, itaconic acid, acrylic acid, maleic anhydride and ring-opened products thereof, arylsulfonic acid, vinyl esters of fatty acids having 4 or more carbon atoms such as vinyl pivalate, and vinylpyrrolidone. , And a compound in which a part or the whole amount of the ionic group is neutralized. The method of introducing the modifying unit may be a method by copolymerization or a method by post-reaction. Further, the distribution of the modifying unit in the polymer chain is not particularly limited, whether it is random, block or graft. When the amount of modification exceeds 20 mol%, the crystallinity is excessively lowered, and the dimensional stability under high humidity cannot be obtained, and the water-soluble fiber cannot be obtained. The average degree of polymerization of the PVA-based polymer used in the present invention is preferably in the range of 100 to 3500, particularly preferably 300 to 3000, and particularly preferably 700 to 2500.

The sheath component can be appropriately selected and used as long as it has anti-pill properties, but in the present invention, it is preferable to use fibers having low hygroscopicity in order to provide a comfortable woven or knitted fabric. . Such fibers include polyester,
Synthetic fibers such as acrylic are suitable, but anti-pill polyester fibers are particularly preferable.

The anti-pill polyester fiber referred to in the present invention means, for example, terephthalic acid obtained by reacting a dicarboxylic acid mainly containing terephthalic acid or its lower alkyl ester derivative with a glycol mainly containing ethylene glycol or ethylene oxide. Second step reaction to obtain a glycol ester of a main dicarboxylic acid and / or a low polymer thereof and polycondensation reaction of the product to obtain a polyester having 85% or more of repeating units of ethylene terephthalate units. In the step of reacting and melt-spinning the polyester to produce polyester fiber, in the step from the completion of the reaction of the first step to the completion of the reaction of the second step, the purity of 96% or more is represented by the formula (1). A phosphorus compound containing 0.5 to 1.5 mol% of phosphorus atoms with respect to all acid components. After being made into a stell, the polyester is melt-spun to form a phosphorus-containing polyester fiber having an intrinsic viscosity of 0.38 to 0.45 and an acid terminal group concentration of 80 μeq / g or more, and the polyester fiber is further heated to 110 ° C. or more in the presence of water. It can be obtained by heat treatment at a temperature to reduce the intrinsic viscosity to 0.36 or less.

[0018]

Embedded image

In the present invention, the dicarboxylic acid or the lower alkyl ester derivative thereof used as the raw material for the polyester is mainly terephthalic acid and its lower alkyl ester derivative, and a part thereof is isophthalic acid or 5-sodiumsulfoisophthalic acid. Adipic acid,
Other dicarboxylic acids such as sebacic acid or lower alkyl ester derivatives thereof may be replaced with. In particular, 5-sodium sulfoisophthalic acid is preferably used because it increases the anti-pill property.

The glycols are mainly ethylene glycol, but some of them are glycols such as propylene glycol, 1.4-butanediol, trimethylene glycol, 1.4 hexanediol and neopentyl glycol. May be replaced.

The alkylene oxides are mainly intended for ethylene oxide, but a part of them may be replaced with propylene oxide, butylene oxide or the like. To produce a polyester from these dicarboxylic acid component and glycol component, the method most commonly practiced in the industry, that is, in the case of polyethylene terephthalate, is explained by esterifying terephthalic acid and ethylene glycol, or By subjecting dimethyl terephthalate and ethylene glycol to a transesterification reaction to form an ethylene glycol ester of terephthalic acid and / or a low polymer thereof, the first step reaction and heating the reaction product of the first step to a high temperature under reduced pressure. It is produced by the second stage reaction of polycondensation reaction.

In the production of the polyester, an esterification catalyst, a transesterification catalyst, a polycondensation catalyst, a matting agent such as titanium dioxide and the like, which are usually used in the production of polyester, an antioxidant, a stabilizer and a fluorescent agent. Whitening agents, pigments and the like can be used as necessary.

After the use of the phosphorus compound used in the present invention, the amount of phosphorus atom in the resulting polyester is 0.5 to 1.5 mol% with respect to the total acid component. If it is less than 0.5 mol%, when heat-treated at a temperature of 110 ° C. or higher in the presence of water,
It is not preferable because the intrinsic viscosity is not sufficiently lowered and the anti-pill performance is insufficient. Also, if it exceeds 1.5 mol%, not only the effect of improving the anti-pill performance is not further increased, but also the quality of the polyester is finally impaired, which is not preferable.

The phosphorus compound may be added at any step from the completion of the reaction of the first step in the above-mentioned polyester production to the completion of the reaction of the second step, but particularly after the completion of the reaction of the first step. The step immediately before the start of the reaction of the second step, or the initial step of the reaction of the second step is preferable.

The phosphorus-containing polyester obtained as described above is melt-spun to obtain polyester-containing fibers, the intrinsic viscosity of the phosphorus-containing polyester fibers being 0.38 to 0.45,
It is necessary to set the concentration of the acidic terminal group to 80 μeq / g or more. When the intrinsic viscosity is less than 0.38, the melt viscosity becomes too low, and problems such as yarn breakage during spinning are unpreferable. On the other hand, if it exceeds 0.45, it is necessary to perform heat treatment at a very high temperature for a long time in order to reduce the intrinsic viscosity of the polyester fiber to 0.36 or less when heat-treated at a temperature of 110 ° C. or higher in the presence of water. It is not preferable because it does. Further, if the concentration of the acidic end group is less than 80 μeq / g, it will be 11 in the presence of water.
When the heat treatment is performed at a temperature of 0 ° C. or higher, the intrinsic viscosity is insufficiently lowered, and the effect of improving the pill resistance becomes insufficient, which is not preferable. Further, the acidic terminal group may be any acidic group such as a carboxyl group and an acidic hydroxyl group.

As the method of containing the acidic terminal group concentration of 80 μeq / g or more, water is added in a step after the completion of polyester polycondensation until melt spinning, or the chip drying condition is adjusted so that the chip water content is higher than usual. The method of increasing the concentration of acidic terminal groups by hydrolyzing the polyester, such as remelting with a so-called direct weight method using terephthalic acid and ethylene glycol as starting materials, suppresses the progress of the esterification reaction to a low level A method such as a method of increasing the number of carboxyl groups present therein is used.

In the present invention, since the intrinsic viscosity of the phosphorus-containing polyester fiber is lowered to 0.36 or less, it is necessary to perform heat treatment at a temperature of 110 ° C. or more in the presence of water. At this time, the presence of water is indispensable, because the intrinsic viscosity is lowered by hydrolyzing the phosphorus-containing polyester. The temperature is 110 ° C. or higher, preferably 120 ° C. or higher and 180 ° C. or lower. If the temperature is less than 110 ° C, it takes a long time to reduce the intrinsic viscosity, or the intrinsic viscosity is less than 0.1.
It is not preferable because it does not decrease to 36 or less. Further, this heat treatment immediately after melt spinning, woven fabric, knitted fabric,
Although it may be carried out at any stage up to the final product such as a sewn product, it is particularly convenient to use the high temperature hot water treatment which is received in the dyeing process.

By using the hollow spun yarn of the present invention,
Although it is possible to manufacture a woven or knitted fabric that is excellent in flexibility and heat retention and is lightweight and bulky, the hollow spun yarn itself may be stretched by tensile stress and the hollow part may disappear. Is preferably removed. Although it is possible to form a woven or knitted fabric using only such hollow spun yarn, it is also possible to manufacture a woven or knitted fabric using a hollow spun yarn and a solid yarn in terms of morphological stability of the hollow portion.

To prevent the hollow portion of the hollow spun yarn from disappearing,
It is preferable to bear the load applied to the woven / knitted fabric only by the solid yarn, and from this point, it is preferable to increase the mixing ratio of the solid yarn, but if the ratio of the solid yarn is too high, the bulkiness of the woven / knitted fabric, Soft feeling will be lost. Therefore, in the case of a woven fabric, it is preferable that the number of hammered-in fabrics is 100: 0 to 20:80, and particularly 40:60 to 60:40. In the case of a knit, it is preferably a plain knit and has a gauge of 20 to 22, particularly 22.

As the solid yarn, yarns of any form such as spun yarn and filaments can be used, and like the hollow spun yarn, they can be composed of hollow fibers or modified cross-section fibers. The type of fiber used is not particularly limited, and synthetic fibers such as polyester fibers and polyamide fibers, and semi-synthetic fibers such as rayon may be appropriately selected and used. Those which do not deteriorate are preferable.

From the viewpoint of morphological stability of the hollow portion of the hollow spun yarn, the diameter of the hollow spun yarn (D1) and the diameter of the solid yarn (D2).
Are preferably close to each other, especially 0.7 ≦ D1 / D2
It is preferable that ≦ 1. The diameter of the yarn here is the diameter of a circle having the same area as the cross-sectional area of the yarn (including the hollow portion and the fiber portion).

The form of the woven or knitted material is not particularly limited and may be appropriately selected depending on the purpose and application. In particular, although the woven fabric originally has extremely low stretchability, when the hollow spun yarn of the present invention is used, excellent stretchability can be obtained. Further, in the case of a knitted fabric, since it is possible to obtain a lighter weight feeling and elasticity, it becomes a high-class product. An excellent woven or knitted material can be obtained by removing the core component by hot water treatment after forming the woven or knitted material. Of course, the woven or knitted fabric may be manufactured after forming the hollow spun yarn.

The woven or knitted fabric using the hollow spun yarn of the present invention is excellent in lightness, heat retention, hygroscopicity, stretchability, pill resistance and the like, and thus can be used for various purposes. For example,
For clothing, there are outer garments such as jackets, coats and sweaters, inner garments such as toner, polo shirts and underwear, and gloves, hats, mufflers and the like as winter clothes.

[0034]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. [Hollow ratio (%) of spun yarn] Take a cross section of the spun yarn on an electron micrograph, set trace paper on it, and copy the whole spun yarn and hollow parts (excluding the hollow part inside the single fiber), The entire spun yarn is cut out with scissors to measure the weight (S1), and further the hollow portion is cut out to measure the weight (S2) of the paper. S1 and S2 of the other hollow spun yarns were weighed in the same manner, the average value of S1 and S2 was determined as the number of measured solids, and the hollow ratio of the spun yarn was calculated. [Bulkiness, shape stability of hollow part, lightness, heat retention, softness, elasticity] Performance after 10 times of wearing and washing is ◎ (very good), ○ (good), △ (somewhat Bad), ×
It was evaluated as (bad). [Anti-pill] From the pill generation status after 5 hours of ICI method, ◎
(4th grade), ◯ (3rd grade), Δ (2nd grade) × (1st grade).

Examples 1 and 2 As core components, water-soluble polyvinyl alcohol fibers (Kuraray Co., Ltd., solvent-based PVA, water dissolution temperature 60 ° C.,
1.5 denier × 38 mm) raw cotton, as the sheath component,
Cotton fiber was used. These raw cottons are separately supplied to a normal spinning process and 0.47 g / m (20
Spinning out a roving having a weight of 0 gelen / 30 yards,
A roving yarn serving as a core component and a roving yarn serving as a sheath component were supplied to both sides thereof and finely spun (primary composite spinning).

Blending cotton process: Hopper mixer 2.5 m / min Cylinder opener 16 times / inch (beater number of strokes) Single beater 17 times / inch (beater number of strokes) Lapping machine 11 oz / yard Carding process: Takein 400 rpm / min Cylinder 200 revolutions / min Doffer 10 revolutions / min Spinning capacity 300 gellen / 6 yards (1 gellen = 1/7000 lbs) Cylinder to top gauge 15/1000 inch Drawing process: Total draft 6 to 8 times Appropriate spinning amount Grain 300 Gelen / 6 yards Roughing process: Total draft 5 to 8 times appropriate Spinning rate 200 Gelen / 30 yards Spinning process: Total draft 20 to 30 times Set appropriately according to spinning number Spindle speed 10,000 rotations / minute Traveler MS / Hf Winding process: Winding speed 50 m / min cheese amount eyes 3.75 lbs / cheese

The obtained core-sheath type composite spun yarn A is used as a core component and an outermost layer component, which is an anti-pill polyester fiber (manufactured by Kuraray Co., Ltd., and has an intrinsic viscosity of 0.36 or less, 1.4 or less.
A three-layer spun yarn was produced using denier x 38 mm) (secondary composite spinning). A 22-gauge plain knitted fabric was produced using the composite yarn. The obtained knitted fabric was supplied to a hot air oven with a tenter at 185 ° C., and heat set for 1 minute at a constant length, and then 1
Solvent-based PVA of core component boiled in hot water at 25 ° C for 30 minutes
Was dissolved and dyed at the same time, and then dried at 105 ° C. to obtain a bulky knit. The results are shown in Table 1. The lightness was equivalent to that of the removed part, and the knitted fabric was excellent in bulkiness, stretchability and heat retention. These characteristics did not change even after repeated washing.

Examples 3 and 4 Anti-pill polyester fiber as the outermost layer component (manufactured by Kuraray Co., Ltd., having an intrinsic viscosity of 0.36 or less after heat treatment, 1.
4 denier x 38 mm) and the same inner sheath layer components as in Example 1 were passed through the carding step to obtain 300 gel /
After obtaining 6 yards of sliver, two cotton fiber sliver in the center and two sliver of 100% polyester fiber on each side are fed to the next process draft and drafted 9 times.
A 0 gelen / 6 yard sliver was spun. This kneading sliver was supplied to the roving step to spin 0.47 g / m of roving (direct spinning). Using the obtained three-layer structure composite yarn, a 22 gauge knitted fabric was manufactured in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 1 A 22-gauge plain knitted fabric was produced with a spun yarn made of cotton fibers. The performance is shown in Table 1.

Comparative Example 2 A 22-gauge plain knitted fabric was produced in the same manner as in the example, using only spun yarn (20th count) made of raw cotton of polyester hollow fiber (1 denier × 38 mm hollowness 10%).
The performance is shown in Table 1.

Comparative Example 3 A 22-gauge plain knitted fabric was produced using a spun yarn made of raw cotton of polyester fiber (1.5 denier × 38 mm). The performance is shown in Table 1.

[0042]

[Table 1]

[0043]

EFFECT OF THE INVENTION According to the present invention, a hollow spun yarn is provided which is excellent in lightness, heat retention and softness and can provide a comfortable woven or knitted fabric having bulkiness, stretchability and anti-pill property. You can A woven or knitted product obtained by using the hollow spun yarn,
Although it can be used for various purposes such as clothing or industrial use, it is particularly suitable for clothing because it is lightweight and has excellent heat retention and pill resistance.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a specific example of a multilayer hollow spun yarn obtained by the present invention.

FIG. 2 is a schematic view showing an example of an apparatus used for primary composite spinning and secondary composite spinning.

Claims (4)

[Claims] 1. A multilayer spun yarn having an innermost layer, an intermediate layer and an outermost layer, wherein the innermost layer or the intermediate layer is composed of a solvent-based PVA fiber capable of being dissolved and removed. 2. A hollow spun yarn having a multilayer structure,
A hollow spun yarn, characterized in that a substantially hollow portion is formed in the center of the spun yarn or in the middle between the outermost layer and the innermost layer. 3. Removal of the solvent-based PVA fiber of a multilayer spun yarn having an innermost layer, an intermediate layer and an outermost layer, the innermost layer or the intermediate layer being composed of solvent-based PVA fiber capable of being dissolved and removed. And a method for producing a hollow spun yarn. 4. A spun yarn in which the outermost layer or the middle layer is mainly composed of fibers having an anti-pill property, and a hollow portion is formed in the center part of the spun yarn or in the middle part between the outermost layer and the innermost layer. Anti-pill woven and knitted fabric containing hollow spun yarn.