JP2022034226A - Fabric, method of producing the same, and textile product - Google Patents

Abstract

To provide a fabric having cilia excellent in smooth and slippery feeling, and dyeability, and favorably excellent even in tension and stiffness, expanding feeling, soft feeling, and even in opacity like a natural fiber typified by silk, a method of producing the same, and a textile product.SOLUTION: A fabric includes a multifilament including one or more fiber group(s) including a center fiber positioned at a center part, and a plurality of ultrafine fibers surrounding the center fiber.SELECTED DRAWING: Figure 1

Description

INDUSTRIAL APPLICABILITY The present invention is a fabric having cilia, a smooth and slippery texture and excellent dyeability, and preferably a fabric having excellent elasticity, swelling feeling, soft feeling, and transparency like natural fibers typified by silk. Regarding the manufacturing method and textile products.

Synthetic fibers typified by polyester are widely used not only for clothing but also for industrial use due to their excellent physical and chemical properties, and have industrially important value. However, these synthetic fibers are compared with natural fibers such as silk and cotton because the single fiber fineness constituting the fiber is uniform, the single fiber fineness is large, and the cross-sectional shape is simple. It has the disadvantage that its texture and luster are monotonous.

In order to improve such defects, various attempts have been made such as deforming the cross-sectional shape of synthetic fibers, crimping, and using composite fibers, but it is said that they still achieve sufficient purposes. hard.

For example, Patent Document 1 proposes to form a composite fiber of an easily decomposable polymer and polyester, and then to impart a dry-touch, squeaky texture and a unique luster to a woven or knitted fabric by post-processing. There is. Further, Patent Document 2 proposes to improve the texture by imparting spots in the length direction of the fibers. Further, Patent Document 3 proposes a fiber having a thick and fine structure and having a groove on the fiber surface and a method for producing the same, in order to obtain a fiber for weaving and knitting which exhibits a higher squeaky feeling with the target of silk. In these prior documents, we have been creatively trying to obtain the soft swelling feeling peculiar to natural fibers, but we are still not satisfied. On the other hand, in Patent Document 4, in order to obtain a unique flexible touch and fineness, the characteristics of nanofibers, which are thinner than microfibers on the order of micron, are used to obtain a texture like a new sensation textile. However, the characteristics of nanofibers are large, and we are still not satisfied with the natural swelling, texture and appearance, and elasticity of natural materials, which was the original purpose. Patent Document 5 proposes that a mixed fiber yarn of a fiber having a large fiber diameter and a sea island fiber is woven and knitted, and then subjected to a desealing treatment to maintain mechanical properties. In this case, the Kaijima fiber portion and the thick fiber bundle portion are unevenly distributed, and the natural swelling is not yet satisfactory. Further, in Patent Document 6, in the cross section of the sea island fiber, a sea island fiber in which a fiber diameter (island diameter) of a small fiber diameter (island diameter) and a fiber having a large fiber diameter (island diameter) are mixed is prepared in advance, and the sea island fiber is knitted and woven, and then the sea is removed. Proposed. However, in this method, since fibers having a large fiber diameter (microfibers or larger) are used, it cannot be said that they are still satisfactory in terms of delicacy.

Japanese Unexamined Patent Publication No. 61-239010 Japanese Unexamined Patent Publication No. 58-7071 Japanese Unexamined Patent Publication No. 59-192709 International Publication No. 2013/021809 Pamphlet Japanese Unexamined Patent Publication No. 2007-262610 Japanese Patent Application Laid-Open No. 5-331711

The present invention has been made in view of the above background, and an object thereof is to have a smooth and slippery texture with cilia and excellent dyeability, and preferably to have elasticity and swelling like natural fibers typified by silk. It is an object of the present invention to provide a fabric having excellent feeling, softness, and transparency, a method for producing the same, and a textile product.

As a result of diligent studies to achieve the above problems, the present inventors have found that a desired fabric can be obtained by skillfully devising the structure of the multifilament constituting the fabric, and by further diligent studies. The present invention has been completed.

Thus, according to the present invention, "a cloth characterized by containing a multifilament containing one or more fiber groups including a central fiber located at a central portion and a plurality of ultrafine fibers surrounding the central fiber" is provided. To.

At that time, it is preferable that the single fiber diameter of the ultrafine fiber is 5000 nm or less. Further, it is preferable that the single fiber diameter of the central fiber is 10 times or more that of the ultrafine fiber. Further, in the fiber group, it is preferable that the number of the central fibers is one and the number of the ultrafine fibers is 10 or more. Further, it is preferable that the multifilament contains 10 or more of the fiber groups. Further, it is preferable that the multifilament is twisted. Further, it is preferable that the multifilament is contained in the fabric as a sheath portion of the core-sheath type composite yarn. Further, in the core-sheath type composite yarn, it is preferable that the core portion is made of a composite fiber composed of two components. Further, it is preferable that any of the fibers constituting the fabric contains a recycled polymer. Further, it is preferable that the dyeability is 30 or less in L value.

Further, according to the present invention, a composite fiber composed of a central fiber island component located in the center, a plurality of ultrafine fiber island components arranged so as to surround the central fiber island component, and a sea component is used. The above-mentioned method for producing a cloth, which is subjected to a desealing treatment after obtaining the cloth, is provided.

Further, according to the present invention, it is selected from the group consisting of women's blouses, dresses, party dresses, men's suits, jackets, slacks, innerwear, sports clothing, interiors, and living materials, which are made of the above-mentioned cloth. Either textile product is provided.

According to the present invention, a fabric having excellent dyeability, elasticity like natural fibers typified by silk, a smooth and slippery texture having cilia, a swelling feeling, a soft feeling, and an excellent transparency is produced. Methods and textile products are obtained.

In the present invention, it is a figure which shows typically an example of a fiber group. It is a drawing substitute photograph of the cross section of the multifilament constituting the cloth obtained in Example 1. It is a drawing substitute photograph of the cross section of the multifilament constituting the cloth obtained in Comparative Example 1. It is a drawing substitute photograph of the cross section of the multifilament constituting the cloth obtained in Comparative Example 2.

Hereinafter, embodiments of the present invention will be described in detail. First, in the present invention, the fiber group includes a central fiber located at the center and a plurality of ultrafine fibers surrounding the central fiber.
Here, the number of central fibers is preferably one. Further, the number of ultrafine fibers surrounding the central fiber in a satellite shape is preferably 10 or more (more preferably 30 to 100).

The single fiber diameter ( _rs ) of the ultrafine fibers (stars) is preferably 5000 nm or less (more preferably 10 to 1000 nm, particularly preferably 100 to 800 nm) in order to obtain an excellent soft feeling. .. On the other hand, it is preferable that the single fiber diameter ( _rc ) of the central fiber (core portion) is 10 times or more (more preferably 10 to 50 times) that of the ultrafine fiber in order to improve elasticity and dyeability. In the central fiber and / or the ultrafine fiber, the cross-sectional shape of the single fiber is not limited, and is round, hollow (for example, round hollow, triangular hollow, square hollow, etc.), and atypical (for example, triangular, square, flat, cross, etc.). Either may be used. When the cross-sectional shape of the single fiber is a modified cross section other than the round cross section, the diameter of the circumscribed circle is defined as the single fiber diameter. The single fiber diameter can be measured by photographing the cross section of the fiber with a transmission electron microscope.

The type of the polymer forming the ultrafine fiber and the central fiber is not particularly limited, but a polyester-based polymer is preferable in terms of fiber strength and dyeing fastness. For example, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polylactic acid, stereocomplex polylactic acid, polyester obtained by copolymerizing the third component, and the like are preferably exemplified. Examples of such polyester include polyester that has been material-recycled or chemically recycled, and polyethylene terephthalate or poly that uses a monomer component obtained as a raw material of biomass, that is, a substance derived from a plant, which is described in JP-A-2009-0916994. It may be trimethylene terephthalate. Further, it can be obtained by using a catalyst made of a light metal such as a catalyst containing a specific phosphorus compound and a titanium compound or a titanium-based catalyst as described in JP-A-2004-27797 and JP-A-2004-21126. It may be made of polyester. In the polymer, if necessary, a micropore forming agent, a cationic dye dyeing agent, an antioxidant, a heat stabilizer, a fluorescent whitening agent, a matting agent, and coloring are contained within a range that does not impair the object of the present invention. The agent, the hygroscopic agent, and the inorganic fine particles may be contained in one kind or two or more kinds.

In the present invention, the multifilament contains one or more (preferably 10 to 100 groups) of the fiber groups.
Such a multifilament can be produced, for example, by the following method. First, the above-mentioned polymer is prepared as an island component polymer (polymer forming ultrafine fibers and central fibers). At that time, various additives such as inorganic substances such as titanium oxide, silica and barium oxide, carbon black, colorants such as pigments and dyes, flame retardants, fluorescent whitening agents, antioxidants, and ultraviolet absorbers are added to the above polymers. May be included in.

Examples of the sea component polymer include polymers capable of melt molding of copolymerized polyethylene terephthalate, polyamide, polystyrene and its copolymers, polyethylene, polyvinyl alcohol and the like, and which can be dissolved and extracted after spinning.
At that time, the weight ratio of both constituents forming the composite fiber is preferably in the range of 80:20 to 20:80.

Next, an island component for central fibers (preferably 1 to 3, particularly preferably 1), and an island component for ultrafine fibers (preferably 10 or more, more preferably 30 to 30) arranged radially (satellite) around the island component. Each component is discharged from a mouthpiece having a discharge hole for discharging 100 pieces) and a sea component.

The discharged sea-island type composite fiber is solidified by cooling air, preferably melt-spun at 400 to 6000 m / min, and then wound. The obtained undrawn yarn is separately made into a composite fiber having desired strength, elongation, and heat shrinkage characteristics through a drawing step, or is taken up by a roller at a constant speed without being wound once, and subsequently drawn. It does not matter which method is used for winding after passing through. Further, false twist crimping may be performed. In such a sea-island type composite fiber, the single fiber fineness, the number of filaments, and the total fineness are 0.5 to 10.0 dtex, the number of filaments is 5 to 75, and the total fineness is 30 to 170 dtex (preferably 30 to 100 dtex), respectively. It is preferably within the range.
In the present invention, the multifilament is obtained by desealing the sea component of the sea-island type composite fiber.

The cloth of the present invention is a cloth made by using such a multifilament. At that time, it is most preferable that the fabric is composed of only the multifilament, but it is preferable that the multifilament is contained in an amount of 30% by weight or more (more preferably 40% by weight or more) with respect to the weight of the fabric.

Further, the total cover factor CF of the fabric (woven fabric or knitted fabric) is preferably 1000 or more (more preferably 1000 to 3000). However, the cover factor CF is calculated by the following formula.
CF = (DWp / 1.1) ^1/2 x MWp + (DWf / 1.1) ^1/2 x MWf
[DWp is the total warp fineness (dtex), MWp is the warp weft density (book / 2.54 cm), DWf is the total weft fineness (dtex), and MWf is the weft weft density (book / 2.54 cm). ]

At that time, the sea-island type composite fiber may be used as it is without twisting to woven and knit the fabric, but if the fabric is twisted at 500 to 3400 T / m, the composite is formed by desealing by the dissolution treatment of the sea component. It is preferable that the fibers have a spring shape and the ultrafine fibers become cilia and cover the central fibers, thereby improving the smooth and slippery texture, softness, lightness, and elasticity. At that time, the twist coefficient is preferably in the range of 7,000 to 30,000. However, the twist coefficient is the product of the number of twists (T / m) and (D / 1.1) ^1/2 . However, D is the total fineness (dtex) of the composite yarn.

Further, the sea-island type composite fiber (multifilament) may be contained in the fabric as a sheath portion of the core-sheath type composite yarn. Further, in the core-sheath type composite yarn, the core portion may be composed of composite fibers composed of two components.

Further, the woven or knitted structure of the cloth is not particularly limited, and the woven structure of the woven fabric is a three-dimensional structure such as plain weave, velvet weave, satin weave, a change structure, a change structure such as change velvet weave, or a vertical double weave. , Single-double weave such as horizontal double weave, vertical pile weave such as vertical velvet, towel, velor, and horizontal pile weave such as Betsuchin, horizontal velvet, velvet, corduroy, etc. are exemplified. The woven fabric having these weaving structures can be woven by a normal method using a normal loom such as a rapier loom or an air jet loom. The number of layers is not particularly limited, and a single layer may be used, or a woven fabric having a multi-layer structure of two or more layers may be used. Further, the type of knitted fabric may be a horizontal knitted fabric or a freshly knitted fabric. As the horizontal organization, flat knitting, rubber knitting, double-sided knitting, pearl knitting, tack knitting, floating knitting, one-sided knitting, lace knitting, hair-covering knitting, etc. are preferably exemplified, and as the vertical knitting structure, single denby knitting, Single atlas edition, double cord edition, half tricot edition, fleece edition, jacquard edition and the like are preferably exemplified. The knitting can be performed by a normal method using a normal knitting machine such as a circular knitting machine, a flat knitting machine, a tricot knitting machine, and a Raschel knitting machine. The number of layers is not particularly limited, and a single layer may be used, or a knitted fabric having a multi-layer structure of two or more layers may be used.

When the fabric is a woven fabric, the density of the finally obtained woven fabric is 130 lines / 2.54 cm or more (preferably 130 to 200 lines / 2.54 cm) and a weft density of 90 lines / 2.54 cm. When it is the above (100 to 150 lines / 2.54 cm), the transparency is improved and it is preferable.

Next, after dyeing the fabric, the sea-island type composite fiber is subjected to a desealing treatment by an alkali weight loss step, and the fiber containing the central fiber located at the center and a plurality of ultrafine fibers surrounding the central fiber. By using a multifilament containing one or more groups, a fabric having a soft feeling and a lightweight feeling in which the fibers of the ultrafine fibers cover the central fibers can be obtained. At the same time, the fabric has excellent transparency and has sufficient dyeing fastness. In this case, since the central fiber having a large fiber diameter is dyed in a dark color, excellent dyeability and dyeing fastness can be obtained. In particular, when a multifilament containing one or more fiber groups including a central fiber located in the center and a plurality of ultrafine fibers surrounding the central fiber is twisted, it is like a natural fiber represented by silk. The elasticity, swelling, softness, and transparency are further improved.

Here, the dyeability is preferably an L value of 30 or less (more preferably 10 to 25). Dye fastness is evaluated by JISL-0844 and JISL-0849 in terms of wash fastness and moisture-sensitive friction fastness. Both robustness is preferably grade 4 or higher. The permeability is preferably 65% or more (more preferably 70% or more, particularly preferably 72 to 98%).

Next, the textile product of the present invention is selected from the group consisting of women's blouses, dresses, party dresses, men's suits, jackets, slacks, inner clothing, sports clothing, interiors, and living materials using the above-mentioned fabrics. It is one of the textile products to be made. Since such a woven fabric uses the above-mentioned fabric, it is excellent in dyeability, and is excellent in elasticity like natural fiber, dry texture with cilia, swelling feeling, soft feeling, and transparency.

Next, examples and comparative examples of the present invention will be described in detail, but the present invention is not limited thereto. In addition, each measurement item in an Example was measured by the following method.

<Stainability L value>
Using a Macbeth color-Eye model M-2020 (manufactured by Colmogen, USA), the L value of the test cloth was measured with a light source D65 and a 10-degree field of view. The number of n was set to 5, and the average value was obtained.

<Dyeing fastness>
Discoloration and fading and contamination of washing fastness and moisture-sensitive friction fastness were measured by JIS L-0844 and L-0849. Grade 4 and above were passed.

<Transparency>
Permeability was measured by JIS L-1923. It was judged that 70% or more was excellent in a woven fabric composed of a multifilament having a total coverage factor of 1200 or more.

<Harikoshi (tension waist)>
Based on the sensory evaluation of 5 testers, the evaluation was made on a scale of "excellent", "slightly inferior", and "inferior", and the most frequent evaluation was concluded.

[Example 1]
Polyethylene terephthalate (melt viscosity at 280 ° C is 1200 poisons, matting agent content: 0% by weight) made of recycled raw material derived from PET bottles as an island component, and 5-sodium sulfoisophthalic acid 6 mol% as a sea component, which is a number average. Using polyethylene terephthalate (melt viscosity at 280 ° C. is 1750 poise) copolymerized with 6% by weight of polyethylene glycol having a molecular weight of 4000, island 1 and island 2 having two kinds of fiber diameters (fiber diameters of island 1 and island 2 are 10). (More than double), with 50 islands 2 (for ultrafine fibers) surrounded by satellites so that one island 1 (for central fibers) becomes the core (melting rate ratio (sea / island) = 230), sea: islands = 50:50, islands = 51, sea-island type composite unstretched fibers (27 filaments) were melt-spun at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min, and once wound up. The obtained undrawn yarn was roller-drawn at a drawing temperature of 80 ° C. and a drawing ratio of 2.5 times, then heat-set at 150 ° C. and wound. The obtained sea-island type composite fiber (drawn yarn) had a total fineness of 73 dtex / 27 fil, and when the cross section of the fiber was observed by a transmission electron microscope TEM, the shape of the island was round and the diameter of the island 1 was 10,000 nm. The diameter of 2 was 700 nm. In this case, the ratio of the single fiber diameters of the two islands is 14. Next, the composite fiber was twisted at 3100 T / m (twist coefficient 25180), twisted and set at 90 ° C., and then arranged on the warp and weft to have a warp density of 105 / 2.54 cm and a warp density of 90. After weaving into a plain weave at /2.54 cm, pre-relax at 60 ° C, liquid flow relax at 120 ° C, preset at 170 ° C, alkali weight loss (weight loss rate 43%), and 130 using black disperse dye. After dyeing at ° C, the final set was completed at 170 ° C. The finished dough had a warp density of 139 / 2.54 cm and a weft density of 101 / 2.54 cm. When the fineness of the warp and weft after processing was measured, it was about 40 dtex due to the dissolution and disappearance of the sea portion due to the weight loss processing. Further, when the woven fabric structure obtained by an electron microscope was confirmed, in the constituent multifilaments, a fiber group containing one central fiber located at the center and 50 ultrafine fibers surrounding the central fiber was found to be 27. It had a group. In addition, voids (FIG. 2, Photo 1) were confirmed between the single fibers in the multifilament. Moreover, when the stainability was measured by the L value, the L value was 21. When the fastness of washing and the fastness of moisture-sensitive friction were confirmed, the fastness was excellent in both discoloration and fading and contamination with grade 4 or higher. Further, the total cover factor of this woven fabric was 1447, and when the permeability of the fabric was confirmed, it was 75.8%, which was an excellent result. Furthermore, the evaluation result of the elasticity was "excellent", and the woven fabric had a smooth and slippery texture and was also excellent in bulkiness.

[Example 2]
The yarn was produced in the same manner as in Example 1, and the yarn was woven into a plain weave at a warp density of 120 threads / 2.54 cm and a weft density of 99 threads / 2.54 cm using the yarn without twisting. After relaxing, presetting at 170 ° C., alkali weight loss (weight loss rate 48%), dyeing at 130 ° C. with a black disperse dye, and final setting at 170 ° C. for finishing. The finished dough had a warp density of 136 / 2.54 cm and a weft density of 108 / 2.54 cm. When the fineness of the warp and weft after processing was measured, it was 38 dtex due to the dissolution and disappearance of the sea portion due to the weight loss processing. The ratio of the single fiber diameters of the two islands was 14. The dyeability had an L value of 22, and when the physical properties of the fabric were confirmed, the fastness was excellent in fastness with discoloration and fading and contamination of grade 4 or higher, but the evaluation of elasticity was "slightly inferior". The total cover factor of this woven fabric was 1471, which was 70% when the permeability was confirmed, but it was 68.8% based on the fabric cover factor of Example 1. The result was a little inferior.

[Comparative Example 1]
Polyethylene terephthalate as an island component (melt viscosity at 280 ° C. is 1200 poisons, content of matting agent: 0% by weight), 6 mol% of 5-sodium sulfoisophthalic acid as a sea component and 6% by weight of polyethylene glycol having a number average molecular weight of 4000. (Melting rate ratio (sea / island) = 230), sea: island = 30:70, number of islands = 8360, fiber diameter of island part using polyethylene terephthalate (melt viscosity at 280 ° C is 1750 poise) The sea-island type composite unstretched fibers having the same viscosity were melt-spun at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min, and once wound up. The obtained undrawn yarn was roller-drawn at a drawing temperature of 80 ° C. and a drawing ratio of 2.5 times, then heat-set at 150 ° C. and wound. The obtained sea-island type composite fiber multifilament (drawn yarn) had a total fineness of 56 dtex / 10 fil, and when the cross section of the fiber was observed by a transmission electron microscope TEM, the shape of the island was round and the diameter was 700 nm. .. Next, the composite fiber yarn was twisted at 3100 T / m (twist coefficient 21920), twisted and set at 90 ° C., and then arranged on the warp and weft to have a warp density of 130 yarns / 2.54 cm and a warp and weft density of 99. After weaving into a plain weave at a book / 2.54 cm, pre-relax at 60 ° C, liquid flow relax at 120 ° C, preset at 170 ° C, alkali weight loss (weight loss rate 40%), and use a black disperse dye. After dyeing at 130 ° C, the final set was completed at 170 ° C. The finished dough had a warp density of 195 / 2.54 cm and a weft density of 110 / 2.54 cm. When the fineness of the warp and weft after processing was measured, it was 33 dtex due to the dissolution and disappearance of the sea portion due to the weight loss processing. Furthermore, when the woven fabric structure obtained by an electron microscope was confirmed, it was confirmed that there were no voids between the constituent multifilaments (FIG. 3, Photo 2). The dyeability was L value 35, the color development was poor, and the fastness was second grade in both discoloration and fading. The total cover factor of this woven fabric was 1671, which was 79% when the permeability was confirmed, but it was 68.4% based on the fabric cover factor of Example 1, which was a little inferior result. .. The elasticity is "inferior", and it has a slimy texture peculiar to ultrafine fibers, and it has become a woven fabric with a crunchy texture that is not bulky.

[Comparative Example 2]
Polyethylene terephthalate (melt viscosity at 280 ° C., content of matting agent: 1.8% by weight) Unstretched fiber with a round cross section is melt-spun and wound once at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min. I took it. The obtained undrawn yarn was roller-drawn at a drawing temperature of 80 ° C. and a drawing ratio of 2.5 times, then heat-set at 150 ° C. and wound. The obtained round cross-section multifilament (drawn yarn) has a total fineness of 44 dtex / 36 fil. Next, the drawn yarn was twisted at 3100 T / m (twist coefficient 19606), twisted and set at 90 ° C., and then arranged on the warp and weft to have a warp density of 105 / 2.54 cm and a weft density of 90. Plain weave at /2.54 cm, after weaving, pre-relax at 60 ° C, liquid flow relax at 120 ° C, preset at 170 ° C, alkali weight loss (weight loss rate 10%), 130 using black disperse dye. After dyeing at ° C, the final set was completed at 170 ° C. The finished fabric had a warp density of 167 / 2.54 cm and a weft density of 115 / 2.54 cm ((FIG. 4, Photo 3). When the dyeability was measured by the L value, the L value was 16. The fastness was the same as that of Example 1 in terms of discoloration and fading, and the total cover factor of this woven fabric was 1784, which was 73% when the permeability was confirmed, but the fabric cover factor of Example 1. Based on the above, it was 59%, which made the fabric more transparent, and although the elasticity was "excellent", the texture was not soft and the fabric was not bulky.

[Comparative Example 3]
Polyethylene terephthalate (melt viscosity at 280 ° C., content of matting agent: 1.8% by weight) Unstretched fiber with a round cross section is melt-spun and wound once at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min. I took it. The obtained undrawn yarn was roller-drawn at a drawing temperature of 80 ° C. and a drawing ratio of 2.5 times, then heat-set at 150 ° C. and wound. The obtained round cross-section multifilament (drawn yarn) has a total fineness of 33 dtex / 24 fil. Next, the drawn yarn was twisted at 3100 T / m (twist coefficient 16979), twisted and set at 90 ° C., and then arranged on the warp and weft to have a warp density of 130 / 2.54 cm and a weft density of 99. Plain weave at /2.54 cm, pre-relaxed at 60 ° C, liquid flow relaxed at 120 ° C, preset at 170 ° C, dyed at 130 ° C with black disperse dye, and finalized at 170 ° C. I set it and finished it. The finished dough had a warp density of 134 pieces / 2.54 cm and a weft density of 197 pieces / 2.54 cm. When the dyeability was measured by the L value, the L value was 18, and the fastnesses were grade 4. The total cover factor of this woven fabric was 1320, which was 63% when the permeability was confirmed, but it was 69.1% based on the fabric cover factor of Example 1, which was slightly inferior. The elasticity was "excellent", but it had no cilia at all, and it became a woven fabric with a texture peculiar to synthetic fibers with neither soft texture nor bulkiness.

[Comparative Example 4]
Using polyethylene terephthalate (melt viscosity at 280 ° C., 1200 poisons, matting agent content: 1.8% by weight), melt spinning at 280 ° C. from a normal spinning machine, 2800
It was taken up at a speed of m / min and wound without stretching to obtain a semi-stretched polyester yarn 56dtex / 36fil (cross-sectional shape of a single fiber: round cross-section). Next, using the polyester yarn, simultaneous drawing false twist crimping was performed under the conditions of a draw ratio of 1.6 times, a false twist number of 2500 T / m, a heater temperature of 180 ° C., and a yarn speed of 350 m / min. The obtained round cross-section multifilament (false twist) has a total fineness of 33 dtex / 36 fil. Next, 300 T / m (twist coefficient 1643) of twisted yarn was applied to the false twisted yarn, and the twisted yarn was arranged on the warp and weft to form a plain weave with a warp density of 135 threads / 2.54 cm and a weft density of 130 threads / 2.54 cm. After weaving, pre-relaxation was performed at 60 ° C., liquid flow relaxation at 120 ° C., presetting at 170 ° C., dyeing at 130 ° C. with a black disperse dye, and final setting at 170 ° C. for finishing. The finished dough had a warp density of 160 pieces / 2.54 cm and a weft density of 140 pieces / 2.54 cm. The total cover factor for this fabric was 1720. When the dyeability was measured by the L value, the L value was 17, and the fastnesses were grade 4. However, the transparency was as high as 82% due to the bulky false twist, but it was 69% based on the fabric cover factor of Example 1, which was slightly inferior to the cloth filling degree. The elasticity of the fabric is "slightly inferior", and it has a bulky feeling peculiar to false plying and has a dry touch. The fabric has no cilia at all.

According to the present invention, a fabric having excellent dyeability, elasticity like natural fibers typified by silk, a smooth and slippery texture with cilia, a swelling feeling, a soft feeling, and an excellent transparency is produced. Methods and textile products are provided and their industrial value is enormous.

Claims (12)

A fabric comprising a multifilament containing one or more fiber groups including a central fiber located at a central portion and a plurality of ultrafine fibers surrounding the central fiber. The fabric according to claim 1, wherein the ultrafine fibers have a single fiber diameter of 5000 nm or less. The fabric according to claim 1 or 2, wherein the single fiber diameter of the central fiber is 10 times or more that of the ultrafine fiber. The cloth according to any one of claims 1 to 3, wherein in the fiber group, the central fiber is one and the ultrafine fiber is 10 or more. The fabric according to any one of claims 1 to 4, wherein the multifilament contains 10 or more of the fiber groups. The fabric according to any one of claims 1 to 5, wherein the multifilament is twisted. The fabric according to any one of claims 1 to 6, wherein the multifilament is included in the fabric as a sheath portion of a core-sheath type composite yarn. The cloth according to claim 7, wherein in the core-sheath type composite yarn, the core portion is made of a composite fiber composed of two components. The fabric according to any one of claims 1 to 8, wherein any of the fibers constituting the fabric contains a recycled polymer. The fabric according to any one of claims 1 to 9, wherein the dyeability is 30 or less in L value. After obtaining a fabric using a composite fiber composed of an island component for central fibers located in the center, a plurality of island components for ultrafine fibers arranged so as to surround the island component for central fibers, and a sea component, the fabric is removed. The method for producing a fabric according to any one of claims 1 to 10, wherein the sea treatment is applied. Selected from the group consisting of women's blouses, dresses, party dresses, men's suits, jackets, slacks, inner clothing, sports clothing, interiors, and living materials using the fabric according to any one of claims 1 to 10. Any textile product.

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