JP7292066B2 - Mixed additional twisted yarn and woven and knitted fabrics - Google Patents

Description

The present invention relates to a mixed additionally twisted yarn and a woven or knitted fabric containing the mixed additionally twisted yarn.

Polyester thin woven or knitted fabrics are widely used in fields such as sportswear and women's clothing. Furthermore, in recent years, in the field of sports, there has been a demand for functional stretchable clothing that is difficult to see through when worn alone.

Examples of methods for imparting functionality to a woven or knitted fabric that is difficult to see through include a method using full dull polyester multifilament and a method of increasing the basis weight of the fabric.

However, when a woven or knitted fabric is produced by the former method, it may not be possible to obtain sufficient impermeability if the full dull polyester multifilament is used. Moreover, when the latter method is used, the basis weight of the fabric increases, the fabric becomes heavy, and the required amount of yarn also increases.

In Patent Document 1, in order to provide a woven or knitted fabric that is excellent in impermeability even if the density is small or the basis weight is light, a fiber cross section obtained by subjecting a specific multifilament to false twisting has a flat shape. , proposed a crimped yarn excellent in crimp rate CC.

On the other hand, in Patent Document 2, in order to provide a woven or knitted fabric with excellent stretchability, two types of polyester polymers, one of which is polyester mainly composed of polytrimethylene terephthalate, are laminated along the fiber length direction. We have proposed a polyester stretch fabric using side-by-side type composite fiber multifilament.

WO2017/221934 Japanese Unexamined Patent Application Publication No. 2001-271248

However, the woven or knitted fabric using the crimped yarn described in Patent Literature 1 is sometimes inferior in stretchability due to insufficient false twist coefficient. In addition, when this crimped yarn is false twisted with a normal false twist coefficient, the cross section of the hollow portion of the multifilament may be deformed or crushed, and the lightness of the woven or knitted product caused by the hollow portion is impaired. there was a case. Therefore, the woven or knitted fabric using the crimped yarn described in Patent Document 1 has been required to be further improved. In addition, the woven or knitted fabric described in Patent Document 2 has sufficient stretchability, but is sometimes poor in translucency, UV protection, and lightness of the fabric, and further improvement has been sought.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a woven or knitted fabric that is excellent in anti-transparency, UV protection, stretchability, and light weight, and a mixed fiber additional twist yarn that can be used for the woven or knitted fabric. .

The present invention relates to the following [1] to [ 7 ].
[1] A mixed filament retwisted yarn containing 50 to 80 % by mass of filaments shown in (i) below and 20 to 50% by mass of filaments shown in (ii) below:
(i) A polygonal single fiber having 4 to 8 corners in a cross-sectional shape perpendicular to the fiber axis, a single circular hollow portion in the cross-section of the fiber , and containing no titanium oxide. Hollow polyester multifilament A;
(ii) side-by-side conjugated polyester multifilament B;
[2] The mixed fiber additionally twisted yarn according to [ 1 ], which has a twist coefficient of 8,000 to 17,000.
[3] A woven or knitted fabric containing 50% by mass or more of the mixed additionally twisted yarn according to [1] or [2] .
[4] The woven or knitted fabric according to [ 3 ], which has an elongation rate of 5% or more in each of the warp and weft directions and an elongation recovery rate of 85% or more in each of the warp and weft directions.
[5] The woven or knitted fabric according to [ 3 ] or [ 4 ], which has a UPF of 40 or more.
[6] The woven or knitted fabric according to any one of [ 3 ] to [ 5 ], which has an anti-see-through index of 87 or more and an ultraviolet shielding rate of 93% or more.
[7] The woven or knitted fabric according to any one of [ 3 ] to [ 6 ], which has a basis weight of 130 to 200 g/ ^m2 .

According to the present invention, it is possible to provide a woven or knitted fabric that is excellent in anti-transparency, UV protection, and stretchability, and is also excellent in lightness, and a mixed yarn that can be used for the woven or knitted fabric.

1 is a fiber cross-sectional photograph of the mixed additionally twisted yarn obtained in Example 1, taken with an optical microscope.

Normally, filaments containing polyester (for example, highly oriented polyester undrawn yarn) are subjected to false twisting as in Patent Document 1, so that boiling water shrinkage is reduced, elongation is reduced, etc. Physical properties can be stabilized, and processability can be improved. However, as described above, false twisting may crush the hollow portion in the filament, thereby impairing the lightness of the filament.
On the other hand, since the mixed filament additional twist yarn of the present invention is not subjected to false twisting, it does not have crimps, and the cross-sectional shape including the specific hollow portion of the filament A is maintained as it is. Normally, if a woven or knitted fabric is produced without subjecting filaments containing polyester to false twisting, the filaments will be stretched and cause streak-like defects, or the filaments will shrink during the finishing process and the dimensions of the fabric will not be stable. For example, it becomes difficult to adjust the dyeing, and other problems tend to occur in process passability. However, in the present invention, by using a mixed additional twisted yarn containing two specific types of filaments, it is possible to improve process passability without performing false twisting, and furthermore, it is transparent and UV cut. A woven or knitted fabric having excellent elasticity, stretchability and lightness can be obtained.

<Mixed fiber additional twisted yarn>
The mixed filament retwisted yarn of the present invention contains 50% by mass or more of the filaments shown in (i) below and 50% by mass or less of the filaments shown in (ii) below. The mixed additional twisted yarn of the present invention that satisfies these requirements has the stretchability (and lightness), which was a problem in the crimped yarn described in Patent Document 1, and the texture described in Patent Document 2. It satisfies all the problems of knitted fabrics such as anti-transparency, UV protection and lightness.
(i) A polygonal hollow polyester multifilament A (hereinafter referred to as , filament A).
(ii) Side-by-side conjugate polyester multifilament B (hereinafter sometimes referred to as filament B).

If the content of the filament A in the mixed additional twisted yarn is 50% by mass or more, the UPF (ultraviolet protection factor) and the UV shielding rate tend to increase. From the same point of view, the content of the filament A in the mixed additional twist yarn is preferably 60% by mass or more, more preferably 65% by mass or more. From the viewpoint of stretchability, the content of filaments A in the mixed additional twist yarn is preferably 80% by mass or less, more preferably 75% by mass or less, and even more preferably 72% by mass or less.

Further, if the content of the filament B in the mixed additional twisted yarn is 50% by mass or less, the yarn has sufficient stretchability. From the same point of view, the content of the filament B is preferably 40% by mass or less, more preferably 35% by mass or less. From the viewpoint of stretchability, the content of the filament B in the mixed additional twist yarn is preferably 20% by mass or more, more preferably 25% by mass or more, and even more preferably 28% by mass or more.
Each filament constituting the combined additional twisted yarn of the present invention will be described in detail below.

(Polygonal hollow polyester multifilament A)
The polygonal hollow polyester multifilament A is a single fiber of the filament A, and the fiber cross-sectional shape in the direction perpendicular to the fiber axis direction has 4 to 8 corners (for example, a polygon such as a square to an octagon). be. When the cross-sectional shape of the fibers is such a shape, the individual single fibers are easily aligned without gaps in the state of the fiber bundle, and the closest packing property is enhanced. The fiber cross-sectional shape of the filament A is preferably a shape having six corners (for example, a hexagon). When the fiber cross-sectional shape of the filament A has six corners, it becomes a close-packed structure, and the UPF and ultraviolet shielding rate can be further increased.
In addition, the cross-sectional shape having 4 to 8 corners may have rounded corners, each side constituting the cross-sectional shape may be straight, or may include a curved line. good.

Further, the filament A has a single circular hollow portion in the fiber cross section. Since the filament A has a circular hollow portion, an air layer is formed in the filament to increase the refractive index, and the refraction of light becomes random, which tends to increase the UV shielding rate, UPF, and anti-transparency. . The cross-sectional shape and hollow portion shape of the filament A can be specified by photographing the fiber cross-section with an optical microscope.
The hollow ratio of the hollow portions in the filament A is preferably 15% or more from the viewpoint of light weight, and 40% or less from the viewpoint of retaining the hollow portions during false twisting.
The hollow ratio can be calculated by measuring the fiber cross-sectional area (including the hollow portion) and the hollow portion cross-sectional area of the hollow fiber from an optical microscope photograph of the fiber cross-section, and calculating the percentage of the hollow portion cross-sectional area to the fiber cross-sectional area.
Hollow ratio (%) = (cross-sectional area of hollow part) / (cross-sectional area of fiber) x 100

The filament A is not particularly limited as long as it is a polyester homopolymer or a multifilament made of a copolymer composed of a plurality of components including polyester, but preferably has the following configuration, for example. That is, a polyester having ethylene terephthalate as a main structural unit, in other words, a filament in which (poly)ethylene terephthalate is the most abundant component among the components constituting the filament A can be mentioned. The filaments may contain a copolymer component other than ethylene terephthalate. The copolymer component includes an isophthalic acid component, an isophthalic acid component containing a metal sulfonic acid group, an aromatic or aliphatic dicarboxylic acid component other than a terephthalic acid component such as an adipic acid component, an aliphatic diol component other than an ethylene glycol component, and the like. mentioned.
As the filament A, for example, a product name: polyester highly oriented hexagonal hollow undrawn yarn (135 dtex/36 f, manufactured by Mitsubishi Chemical Corporation) can be used.

(Side-by-side type conjugated polyester multifilament B)
In the mixed fiber additionally twisted yarn of the present invention, the filament B is mixed with the filament A and additionally twisted, so that the process passability can be improved without performing false twisting. Appropriate stretchability can be imparted to the twisted yarn.

The filament B is not particularly limited as long as it is a composite fiber multifilament in which at least two types of polyester-based polymers mainly composed of polyethylene terephthalate are laminated side-by-side along the fiber length direction.
As the filament B, for example, trade name: Z110 (56dtex/12f, manufactured by Unitika Trading Co., Ltd.) can be used.

The mixed additional twisted yarn of the present invention can be produced by mixing and additionally twisting the filament A and the filament B described above. preferable.
When the twist coefficient is 8000 or more, the filament A and the filament B can be easily converged, and when the fabric is made into a fabric, the surface of the fabric is less likely to have grain defects or fluffiness. When the twist coefficient is 17,000 or less, the woven fabric tends to have a bulging feel, and the threads are easily prevented from becoming too thin, making it more difficult for the performance of anti-transparency, UV shielding rate, and UPF to decrease. From the same point of view, the twist coefficient of the mixed additional twist yarn is more preferably 9,000 to 16,000, and even more preferably 11,000 to 14,000.
The twist coefficient of the mixed additionally twisted yarn can be specified by a calculation formula to be described later.

<Woven or knitted fabric>
The woven or knitted fabric of the present invention is produced using the mixed additional twist yarn described above, and contains 50% by mass or more of the mixed additional twist yarn. When the combined additional twisted yarn is contained in an amount of 50% by mass or more, good anti-transparency, ultraviolet shielding rate and UPF can be easily obtained. From the same point of view, the woven or knitted fabric of the present invention preferably contains 60% by mass or more, more preferably 70% by mass or more, of the mixed additional twist yarn.

The woven or knitted fabric of the present invention preferably has an elongation rate of 5% or more in each of the warp and weft directions, and an elongation recovery rate of 85% or more in each of the warp and weft directions. If the elongation rate of the woven or knitted fabric is 5% or more in each of the warp and weft directions, the garment will be more comfortable to wear because it will easily follow the movements of the joints when a person is exercising. Further, if the elongation recovery rate of the woven or knitted fabric in each of the warp and weft directions is 85% or more, it will easily follow the movements of the joints of the human body as well as the elongation rate, making the garment more comfortable to wear.
From the same point of view, the elongation rate of the woven or knitted fabric is more preferably 7% or more in both the warp and weft directions, and the elongation recovery rate of the woven or knitted fabric is more preferably 90% or more in both the warp and weft directions. Furthermore, from the same point of view, the elongation rate of the woven or knitted fabric is more preferably 9% or more in both the warp and weft directions, and the elongation recovery rate of the woven or knitted fabric is more preferably 92% or more in both the warp and weft directions. The elongation rate and elongation recovery rate in each direction of the woven or knitted fabric can be specified by the method described later.

The woven or knitted fabric of the present invention preferably has a UPF of 40 or more. Since the UPF is 40 or more, it is possible to easily prevent the skin from being sunburned by ultraviolet rays when used as clothing. From the same point of view, the UPF of the woven or knitted fabric is more preferably 45 or more, more preferably 50 or more. The UPF of the woven or knitted fabric can be specified by the method described later.

The woven or knitted fabric of the present invention preferably has an anti-see-through index of 87 or more and an ultraviolet shielding rate of 93% or more.
If the anti-see-through index of the woven or knitted fabric is 87 or more, it is preferable because the inner shirt, underwear, etc. will not be easily see-through when worn. From the same viewpoint, the anti-see-through index of the woven or knitted fabric is more preferably 89 or more, and still more preferably 91 or more.
In addition, since the woven or knitted fabric has an ultraviolet shielding rate of 93% or more, it is possible to easily prevent the skin from being sunburned by ultraviolet rays when used as clothing. From the same viewpoint, the UV shielding rate of the woven or knitted fabric is more preferably 94% or more, and still more preferably 95% or more. The anti-see-through index and UV shielding rate of the woven or knitted fabric can be specified by the methods described later.

The woven or knitted fabric of the present invention preferably has a basis weight of 130 to 200 g/m ² . When the basis weight of the woven or knitted fabric is 130 g/m ² or more, it becomes more difficult to see through, and the effect of making the skin less likely to be burned by ultraviolet rays can be obtained. Also, if the fabric weight is 200 g/m ² or less, the fabric is not too heavy, and the anti-transparency, UPF, and UV shielding effects can be maximized.
A fabric with a light basis weight can be handled as a lightweight material in the fields of sports and women's clothing. From the same point of view, the basis weight of the woven or knitted fabric is more preferably 130 g/m ² or more and 185 g/m ² or less, and even more preferably 130 g/m ² or more and 150 g/m ^{2 or} less.

<Method for producing mixed additional twist yarn and method for producing woven or knitted fabric>
The method for producing the mixed additional twist yarn and the woven or knitted fabric of the present invention is not particularly limited, and a method known in the field of woven or knitted fabrics can be used as appropriate. can.
- Prepare the filament A and the filament B described above (filament preparation step).
- A process of performing a mixed fiber process using two types of prepared filaments to produce a mixed fiber yarn (mixed fiber process).
- A step of additionally twisting the obtained mixed yarn by S twisting or Z twisting to produce a mixed yarn additionally twisted yarn (additional twisting step).
- A process of weaving using the obtained mixed fiber additionally twisted yarn (weaving process).
- A step of finishing the obtained unbleached fabric (processing step).
Each step will be described below.

(Filament preparation process)
First, filament A and filament B described above are prepared. As a method for producing each filament, a method conventionally known in the field of woven and knitted fabrics can be appropriately used.

(Mixing process)
Next, using these filaments, a mixed fiber process is performed to produce a mixed yarn. At that time, the content ratio of the filament A in the mixed yarn to be produced is set to 50% by mass or more, and the content ratio of the filament B is set to 50% by mass or less. As a mixed fiber processing method, a conventionally known method in the field of woven and knitted fabrics can be appropriately used.

(Additional twisting process)
The obtained mixed yarn is additionally twisted to produce a mixed yarn additionally twisted. At that time, the number of twists and the twist direction (S twist and Z twist) are not particularly limited, but are preferably set so as to satisfy the above-described twist coefficient (8000 to 17000).

(Weaving process)
The resulting mixed additional twisted yarn is used as at least part of the warp and/or weft to weave the unbleached fabric. In this case, for example, as the warp and the weft, mixed additional twisted yarns with twist directions of S twist and Z twist can be used by arranging them alternately.

(Processing process)
Conventionally known finishing processes can be applied to the resulting woven fabric. Although the processing method is not particularly limited, for example, the obtained unbleached fabric can be dyed using a conventionally known dyeing machine.

The mixed additional twist yarn and the woven or knitted fabric of the present invention can be obtained by the manufacturing method as described above.

EXAMPLES The present invention will be specifically described below with reference to Examples, but the present invention is not limited to these embodiments. In addition, the measurement of each item in each example was based on the following method.

(Method for measuring elongation rate)
The elongation rate in the warp direction and the weft direction of the woven or knitted fabric was measured by the method specified in JIS L 1096 B method (constant load method). At that time, the load was 14.7 N, and the distance between the marked lines was 200 mm.

(Method for measuring elongation recovery rate)
The stretch recovery rate in the warp direction and weft direction of the woven or knitted fabric was measured by the method specified in JIS L 1096 B-1 method (constant load method). At that time, under the same condition setting as above, it was determined from the length between the marked lines when the load was removed and the initial load was applied 1 hour later.

(Measurement method of anti-see-through index)
The anti-see-through index of the woven or knitted fabric was measured by the method specified in JIS L 1923 B method (instrument method). At that time, the measurement was performed in a dry state.

(Method for measuring UPF, ultraviolet shielding rate)
UPF of woven and knitted fabrics was measured by the method specified in AS/NZS 4399. In addition, the UV shielding rate of the woven or knitted fabric was measured by the method stipulated in the uniform evaluation method for processing effects of UV-cut materials (apparel product quality performance countermeasures council (APA vs. Kyodo) method).

(Method for calculating twist factor)
The twist coefficient of the mixed additional twist yarn can be specified by the following formula.
K=T×√(X)
K: twist coefficient, T: number of twists (twists/m), X: fineness (dtex).

[Example 1]
As the filament A, a set of nozzle holes each having 6 circular slits with an internal angle of 120 degrees was arranged, and a spinneret having 36 sets of the nozzle holes was used. The coalescence was spun to prepare a polyester highly oriented hexagonal hollow undrawn yarn (135 dtex/36 f, manufactured by Mitsubishi Chemical Corporation). The filament A had a cross-sectional shape in the direction perpendicular to the fiber axis of the single fiber with six corners and a single circular hollow portion in the cross-section of the fiber.
As the filament B, a polyester conjugate yarn (56dtex/12f, trade name: Z110, manufactured by Unitika Trading Co., Ltd.) was prepared. In the filament B, two types of polyester polymers mainly composed of polyethylene terephthalate were laminated side-by-side along the fiber length direction.

After the filament A and the filament B were aligned, they were mixed to produce a mixed yarn (191 dtex/48 f).

Next, the resulting mixed filament yarn was additionally twisted with a twist number T of 800 times/m and twist directions of S twist and Z twist, respectively, to produce two types of mixed filament additionally twisted yarn with different twist directions. The twist coefficient K calculated from the above formula for the two types of mixed additional twist yarns obtained was 11,056 for both. In addition, the content of filament A in the obtained two types of mixed additional twist yarn was 71% by mass, and the content of filament B was 29% by mass. Further, the fiber cross section of the obtained mixed fiber additional twisted yarn was photographed with an optical microscope, and as shown in the fiber cross section photograph of FIG.

Using the obtained mixed additionally twisted yarn, the warp is alternately arranged with S twist and Z twist mixed yarn additionally twisted at a ratio of 1:1, and the mixed yarn additionally twisted with S twist and Z twist is arranged at a ratio of 1:1 for the weft. to produce a 2/2 twill fabric having a warp density of 67/2.54 cm and a weft density of 64/2.54 cm. That is, the content of the mixed additional twist yarn in the woven fabric was 100% by mass.

The resulting twill fabric was subjected to scouring, relaxation, alkali reduction, dyeing with a disperse dye, and finishing treatment to obtain a fabric.

The resulting fabric had a warp density of 90/2.54 cm, a weft density of 78/2.54 cm, and a basis weight of 148.9 g/m ² .
The elongation rates of the obtained fabric were 10.0% and 11.9% in the warp and weft directions, respectively, and the elongation recovery rates were 96.4% and 92% in the warp and weft directions, respectively. 0%, and all showed high values.
Furthermore, the obtained fabric had a UPF of 45, an ultraviolet shielding rate of 93.7%, and an anti-see-through index of 89.3, all of which were high values.
Thus, the obtained woven fabric had a light weight per unit area and was excellent in UV protection, anti-transparency and stretchability in spite of being light in weight. Details are shown in Table 1.

[Example 2]
A woven fabric with a warp density of 101/2.54 cm and a weft density of 64/2.54 cm was produced in the same manner as in Example 1, except that the fabric structure was changed from 2/2 twill to 5-ply satin. Furthermore, the same finishing treatment as in Example 1 was performed to obtain a woven fabric.
The resulting fabric had a warp density of 128/2.54 cm, a weft density of 78/2.54 cm, and a basis weight of 183 g/m ² .
The elongation rates of the obtained fabric were 11.0% and 7.6% in the warp and weft directions, respectively, and the elongation recovery rates were 95.7% and 93% in the warp and weft directions, respectively. .9%, and both showed high values.
Furthermore, the resulting fabric had a UPF of 50+, an ultraviolet shielding rate of 96.8%, and an anti-see-through index of 91.9, all of which were high values.
Thus, the woven fabric thus obtained had excellent UV protection, anti-transparency and stretchability in spite of its light basis weight. Details are shown in Table 1.

[Comparative Example 1]
As the filament B, a polyester conjugate yarn (56dtex/12f, trade name: Z110, manufactured by Unitika Trading Co., Ltd.) was prepared. As another multifilament C, a polyester highly oriented undrawn yarn (90 dtex/36 f, manufactured by Mitsubishi Chemical Corporation) was prepared. The single fiber of the multifilament C has a circular cross-sectional shape in the direction perpendicular to the fiber axis, and the fiber cross-section does not include a hollow portion.

Using the filament B and the multifilament C, a mixed fiber process was performed to produce a mixed yarn (147 dtex/48 f). Next, the resulting mixed filament yarn was additionally twisted with a twist number T of 1800 times/m and twist directions of S twist and Z twist, respectively, to produce two types of mixed filament additionally twisted yarn with different twist directions. The twist coefficient K calculated from the above formula for the two types of mixed additional twist yarns obtained was 21,824 for both. In addition, the content of filament B in the obtained two types of mixed additional twist yarn was 38% by mass, and the content of filament C was 62% by mass.

Using the obtained mixed additionally twisted yarn, the warp is alternately arranged with S twist and Z twist mixed yarn additionally twisted at a ratio of 1:1, and the mixed yarn additionally twisted with S twist and Z twist is arranged at a ratio of 1:1 for the weft. A woven fabric of 2/2 twill with a warp density of 74/2.54 cm and a weft density of 74/2.54 cm was produced in an alternating arrangement.

The resulting twill fabric was subjected to scouring, relaxation, alkali reduction, dyeing with a disperse dye, and finishing treatment to obtain a fabric. The resulting fabric had a warp density of 99 threads/2.54 cm, a weft density of 95 threads/2.54 cm, and a basis weight of 132.5 g/m ² .
The elongation rate of the resulting fabric was 15.0% and 16.8% in the warp and weft directions, respectively, and the elongation recovery rates were 90.3% and 91.3 in the warp and weft directions, respectively. %, and all were good results.
However, the resulting woven fabric had a UPF of 10, an ultraviolet shielding rate of 91.4%, and an anti-transparency index of 80.7, indicating poor UV protection and anti-transparency. Details are shown in Table 1.

[Comparative Example 2]
A woven fabric with a warp density of 113/2.54 cm and a weft density of 74/2.54 cm was produced in the same manner as in Comparative Example 1, except that the fabric structure was changed from 2/2 twill to 5-ply satin. Furthermore, the same finishing treatment as in Example 1 was performed to obtain a woven fabric.
The resulting fabric had a warp density of 154/2.54 cm, a weft density of 97/2.54 cm, and a basis weight of 180.5 g/m ² .
The elongation rate of the resulting fabric was 15.0% and 18.1% in the warp and weft directions, respectively, and the elongation recovery rates were 93.5% and 89.2% in the warp and weft directions, respectively. % and UPF was 50+, both of which were good results.
However, the resulting woven fabric had an ultraviolet shielding rate of 91.7% and an anti-transparency index of 86.7, indicating poor ultraviolet shielding rate and anti-transparency. Details are shown in Table 1.

[Comparative Example 3]
First, polyethylene terephthalate (PET) having an intrinsic viscosity of 0.676 η to which 2% by mass of titanium dioxide was added was prepared. Next, using a spinneret having 36 sets of nozzle holes each having a diameter of φ1.0 mm and having six annularly arranged center-bending slits of 120° inside angle, spinning was performed at a spinning temperature of 280°C. PET was spun and taken up at a take-up speed of 1400 m/min to form an undrawn yarn. Then, it was further drawn to 0.69 times the maximum draw ratio to produce a full dull polyester multifilament D (84dtex/36f, manufactured by Mitsubishi Chemical Corporation). The single fiber of the multifilament D had a hexagonal cross section in the direction perpendicular to the fiber axis, and the hollow portion in the fiber cross section was circular.
The resulting multifilament D was false twisted at a false twist coefficient of 14,000. Observation of the fiber cross section of the single filament of the false twisted textured yarn revealed that no crushing was observed in the hollow portion.

Two multifilaments obtained were aligned and plied 300 times/m in the S direction. The resulting false twisted plied yarn was used for warp and weft to produce a plain woven fabric having a warp density of 102/2.54 cm and a weft density of 62/2.54 cm. The resulting plain woven fabric was subjected to scouring, relaxation, alkali reduction, dyeing with a disperse dye, and finishing treatment to obtain a woven fabric.
The resulting fabric had a warp density of 112 threads/2.54 cm, a weft density of 66 threads/2.54 cm, and a basis weight of 147.5 g/m ² . The resulting fabric had a UPF of 50+, an ultraviolet shielding rate of 99.7%, an anti-see-through index of 95.4, and an elongation recovery rate of 100.0% in both the warp and weft directions. 100.0%, and all showed good results. However, the elongation rate of the obtained woven fabric was 2.0% and 7.5% in the warp and weft directions, respectively, indicating poor stretchability (especially elongation rate). Details are shown in Table 1.

The mixed additional twisted yarn of the present invention and the woven or knitted fabric using it provide clothes that are thin but have excellent stretchability and stretch recovery when worn, and also have excellent UPF, UV shielding, and anti-transparency. be able to. Therefore, they are suitable as materials for woven or knitted fabrics for use in sports clothing, working clothing, and the like.

Claims (7)

Mixed additional twisted yarn containing 50 to 80 % by mass of filaments shown in (i) below and 20 to 50% by mass of filaments shown in (ii) below:
(i) A polygonal single fiber having 4 to 8 corners in a cross-sectional shape perpendicular to the fiber axis, a single circular hollow portion in the cross-section of the fiber , and containing no titanium oxide. Hollow polyester multifilament A;
(ii) side-by-side conjugated polyester multifilament B; The mixed filament additionally twisted yarn according to claim 1 , having a twist coefficient of 8,000 to 17,000. A woven or knitted fabric containing 50% by mass or more of the mixed additionally twisted yarn according to claim 1 or 2 . The woven or knitted fabric according to claim 3 , wherein the elongation rate in each of the warp and weft directions is 5% or more, and the elongation recovery rate in each of the warp and weft directions is 85% or more. The woven or knitted fabric according to claim 3 or 4 , which has a UPF of 40 or more. The woven or knitted fabric according to any one of claims 3 to 5 , which has an anti-see-through index of 87 or more and an ultraviolet shielding rate of 93% or more. The woven or knitted fabric according to any one of claims 3 to 6 , which has a basis weight of 130 to 200 g/ ^m2 .

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