JP2021188156A - False-twisted yarn, and woven or knitted fabric - Google Patents

Abstract

To provide a false-twisted yarn excellent in anti-see-through properties in wet state, fastness and manufacturing process passability, and a woven or knitted fabric made thereof.SOLUTION: A false-twisted yarn comprises at least an outermost layer part with a titanium oxide content of 0 to 2 mass% and an internal layer part with a titanium oxide content of 11 to 30 mass%. The titanium oxide in the internal layer part is a rutile type. The false-twisted yarn has a degree of intermingle of 30 to 180 point/m.SELECTED DRAWING: None

Description

The present invention relates to a false plyed yarn and a woven or knitted fabric which are excellent in see-through resistance and fastness when wet, and also have excellent passability in a manufacturing process.

Conventionally, as a technique for imparting transparency, ultraviolet shielding property, heat shielding property, etc. to a woven or knitted fabric, a method of kneading ceramics, particularly titanium oxide, into fibers constituting the woven or knitted fabric is well known and generally performed. However, if the content of titanium oxide is simply increased, the amount of titanium oxide present on the yarn surface increases, and the yarn guide in the spinning process, drawing process, false twisting process, twisting process, weaving process, knitting process, etc. -Las, reeds, knitting needles, etc. are significantly worn, and parts need to be replaced frequently. In addition, fluff and thread breakage occur frequently on the fiber itself. Therefore, the content of titanium oxide was limited to 2 to 3% by weight of the fiber constituent material at most.

In order to improve such a defect, a core-sheath type composite fiber has been proposed (see Patent Document 1). In this method, a high concentration of titanium oxide is contained in the inner layer portion and the titanium oxide content in the outer layer portion is reduced, so that the wear of the thread guides is improved and a certain transparency effect is obtained. However, in this method, the see-through effect after false twisting and the fastness of the woven or knitted fabric when titanium oxide is contained in a high concentration are not taken into consideration at all.

Further, there has been proposed a core-sheath composite fiber in which a modified cross section is added to the core-sheath type composite fiber to give a see-through property, a dry feeling, and a drape (see Patent Document 2). However, even in this method, the see-through effect after false twisting and the fastness of the woven or knitted fabric are not considered at all.

On the other hand, in recent years, the need for see-through property has increased, and not only the see-through property in a dry state but also the see-through property in a wet state has been demanded. In a wet state, light scattering is suppressed and the material becomes more transparent, so there is an increasing demand for a highly transparent material. In view of this situation, in 2017, JIS L1923 "Method for evaluating the see-through property of textile products" also specified the see-through property in the wet state.

The see-through property in a wet state has been proposed as an effect of a false twisted hollow multifilament yarn in which a hollow portion cross section is added to a core-sheath type composite fiber (see Patent Document 3). However, in this method, although the see-through effect after false twisting and the process passability are taken into consideration, the decrease in whiteness in the wet state is measured by an original method for the see-through property in the wet state. It was just inadequate.

Further, a fiber having a high see-through resistance even after false twisting has been proposed by using a core-sheath type polyester flat cross-section fiber (see Patent Document 4). However, even in this method, the see-through performance in a wet state is not mentioned, and a sufficient effect cannot be expected.

As described above, in the false twisted yarn widely developed for general outer clothing, a material sufficiently corresponding to the transparency evaluation in a wet state specified by JIS has not been obtained.

Japanese Unexamined Patent Publication No. 55-158331 Japanese Unexamined Patent Publication No. 10-317230 Japanese Unexamined Patent Publication No. 2016-113715 Japanese Unexamined Patent Publication No. 2013-44055

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a false twisted yarn having excellent transparency and fastness in a wet state and excellent passability in a manufacturing process, and a woven or knitted fabric using the same. do.

The present invention for solving the above problems is characterized by any of the following configurations.
(1) It has at least an outermost layer portion having a titanium oxide content of 0 to 2% by mass and an inner layer portion having a titanium oxide content of 11 to 30% by mass, and the titanium oxide in the inner layer portion is a rutile type and has a degree of entanglement. False twisted yarn characterized by being 30 to 180 k / m.
(2) The falsely twisted yarn according to (1) above, wherein the flatness is 2.5 or less.
(3) The falsely twisted yarn according to (1) or (2) above, wherein the crimp ratio is 25 to 45%.
(4) The provisional provision according to any one of (1) to (3) above, wherein the innermost layer portion having a titanium oxide content of 0 to 2% by mass is provided inside the inner layer portion. Plying.
(5) A woven or knitted fabric using the false twisted yarn according to any one of (1) to (4) above.
(6) The woven or knitted product according to (5) above, wherein the false twisted yarn and the cellulose fiber are interwoven or knitted.

According to the present invention, there is provided a false plying yarn and a woven or knitted fabric which are excellent in fastness, passability through a manufacturing process, and have transparency resistance in a wet state, even though titanium oxide is contained in a high concentration in the inner layer portion. can do.

It is important that the false twisted yarn of the present invention has at least an inner layer portion containing a high amount of titanium oxide and an outermost layer portion containing a low titanium oxide content. By having the outermost layer portion having a titanium oxide content of 0 to 2% by mass, it is possible to reduce the friction of titanium oxide and the yarn such as guides in the spinning, false twisting, and weaving processes, and industrial stable production can be achieved. It will be possible. In addition, since the titanium oxide content of the outermost layer is low, the reflectance of the fiber surface is high, but the mirror effect is generated especially by the high regular reflectance in the wet state, and the back side is visible in the case of woven and knitted fabrics. It becomes difficult to do. Therefore, it is possible to improve the see-through property in a wet state. This Miller effect at the time of wetting becomes particularly remarkable when interwoven or knitted with other fibers such as cellulosic fibers. The titanium oxide content of the outermost layer portion is a value relative to the mass of the outermost layer portion, and when the content ratio exceeds 2% by mass, the passability in the manufacturing process is extremely deteriorated. A more preferable titanium oxide content in the outermost layer portion is 0 to 1% by mass, and the outermost layer portion may not contain titanium oxide at all.

Further, since the false twisted yarn of the present invention has an inner layer portion having a titanium oxide content of 11 to 30% by mass, it is possible to improve the see-through property, particularly the see-through property in a wet state. It is possible to obtain a titanium oxide content of less than 11% by mass as long as it is only transparent in a normal dry state, but it becomes more transparent by suppressing light scattering in a wet state. Therefore, in the present invention, an inner layer portion having a titanium oxide content of 11% by mass or more is indispensable. However, if the titanium oxide content of the inner layer portion exceeds 30% by mass, there arises a problem that the yarn strength is extremely lowered. Therefore, the titanium oxide content in the inner layer is within the above range. A more preferable content of titanium oxide in the inner layer portion is 12 to 18% by mass.

On the other hand, in the false twisted yarn having a high titanium oxide content in the inner layer portion, a big problem is fastness. Titanium oxide generates radicals when irradiated with light, oxidatively decomposes polymers and dyes, and causes problems such as deterioration of light fastness and yellowing. Due to the deformation of the fiber cross section of the false plying, even if the outermost layer has a protective layer, some of the protective layers are deformed and become thinner, which causes problems such as deterioration of light fastness and yellowing. It's easy to do.

Therefore, in the present invention, rutile-type titanium oxide, which does not easily generate radicals even when irradiated with light, is used for the inner layer portion. By doing so, even when the titanium oxide content in the inner layer portion is high and the fiber cross section is deformed by false twisting, deterioration of light fastness and occurrence of yellowing can be suppressed. Here, if a normal anatase type is used as titanium oxide, there is an advantage that it can be manufactured at low cost, but deterioration of light fastness and yellowing are unavoidable due to light irradiation. Therefore, in the present invention, rutile-type titanium oxide is used for the inner layer portion containing titanium oxide at a high concentration. The outermost layer having a low titanium oxide content may be a rutile type or an anatase type.

The mass ratio of the outermost layer portion to the inner layer portion is preferably in the range of 10:90 to 40:60 for the outermost layer portion: the inner layer portion. A ratio in this range is preferable in terms of achieving both transparency resistance and process passability. More preferably, the ratio is 15:85 to 25:75.

Further, the false twisted yarn of the present invention may have not only a two-layer structure of an inner layer portion and an outermost layer portion but also a three-layer structure or more. When the number of layers is increased, light is reflected even at the layered interface, and the transparency resistance is further improved, which is preferable. From the viewpoint of achieving both cost and see-through performance, a three-layer configuration including the outermost layer portion, the inner layer portion, and the innermost layer portion provided further inside the inner layer portion is preferable. In the case of such a three-layer structure, if the mass ratio of the inner layer portion having a high titanium oxide content is 25% by mass or more of the false twisted yarn, the see-through performance can be maintained, so that the titanium oxide content of the innermost layer portion is low. But there is no problem. In particular, when the titanium oxide content in the innermost layer portion is 2% by mass or less, it is preferable because not only the transparency resistance but also the color development property is improved.

The false twisted yarn of the present invention may be a polyester fiber or a nylon fiber, but is preferably a polyester fiber having high refraction and high crimping fastness. Specific examples include, but are not limited to, aromatic polyester fibers such as polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate, and aliphatic polyester fibers such as polylactic acid and polyglycolic acid. Among them, polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate fibers are preferable because they have excellent mechanical properties and durability and are robust in crimping. Further, polyethylene terephthalate fibers are preferable because they can obtain washing durability peculiar to polyester fibers.

As the polyethylene terephthalate, polyester having terephthalic acid as a main acid component and ethylene glycol as a main glycol component, in which 90 mol% or more is a repeating unit of ethylene terephthalate, can be used. Further, a copolymerization component capable of forming another ester bond may be contained as long as the effect of the present invention is not impaired. Examples of the copolymerizable compound include dicarboxylic acids such as isophthalic acid, cyclohexanedicarboxylic acid, adipic acid, dimaic acid, sebacic acid, and sulfonic acid.

The false twisted yarn of the present invention has at least a two-layer structure of an outermost layer part and an inner layer part, that is, a core sheath structure, and has a round cross section, a triangular cross section, a flat cross section, a hexagonal cross section, an L type, a T type, a W type, and an eight leaf. It is possible to select a type having an arbitrary shape such as a type, a polygonal type such as a dogbone type, or a diverse type, but the core sheath structure does not easily change even if the cross section of the false twist is deformed, and the outermost layer portion. A round shape is preferable because the thickness is stable and the fastness does not easily decrease. Further, when the flatness of the false twisted yarn is 2.5 or less, it is easy to achieve both high crimping performance and see-through resistance, which is preferable. However, in the hollow cross-sectional structure, the cross-section is liable to be crushed in the false twist, and as a result, the variation in crimping is large and the variation in the see-through performance is liable to occur. Therefore, a substantially solid cross-sectional structure is preferable. A more preferable flatness of the false twisted yarn is 1.0 or more and 2.0 or less.

The total fineness of the false twisted yarn of the present invention is preferably 33 to 500 dtex from the viewpoint of imparting firmness and see-through performance to the woven fabric. At this time, if the total fineness is less than 33 dtex, it is difficult to obtain see-through performance, which is not preferable. Further, when the total fineness exceeds 500 dtex, it becomes too thick when used as outer garments, and it is natural that it is difficult to see through, and the effect of the present invention cannot be obtained, which is not preferable.

Further, it is preferable that the single yarn fineness of the false twisted yarn of the present invention is 0.8 to 10 dtex from the viewpoint of imparting the minimum elasticity to the woven or knitted fabric. At this time, if the single yarn fineness is less than 0.8 dtex, the fiber strength becomes extremely weak, and the tear strength and the burst strength of the woven and knitted fabric decrease, which is not preferable. Further, when the fineness of the single yarn exceeds 10 dtex, the single yarn is too thick and it becomes difficult to obtain high crimping, which is not preferable.

The crimp ratio of the false twisted yarn of the present invention is preferably 25 to 45%. Since the false twisted yarn of the present invention contains a high amount of titanium oxide in the inner layer portion, the fiber orientation tends to be low and the crimping applied tends to be weak, but if the crimping ratio is 25% or more, it tends to be weak. It is preferable because the single yarn is opened by crimping, light scattering can be effectively performed, and the see-through performance is improved. On the other hand, if the crimp ratio exceeds 45%, the crimp coil becomes too fine and the single yarn converges, which tends to reduce the see-through performance, which is not preferable.

Further, it is preferable that the strength of the false twisted yarn of the present invention is 1.5 to 3.5 cN / dtex from the viewpoint of achieving both durability and see-through performance. When the strength is 3.5 cN / dtex or less, the fibers are easily fibrillated, the light scattering property is increased, and the see-through property is improved, which is preferable. On the other hand, if the strength is less than 1.5 cN / dtex, the tear strength and the burst strength of the woven and knitted fabric are lowered, which is not preferable.

It is important that the degree of entanglement of the false twisted yarn of the present invention is 30 to 180 pieces / m. It is very important that the crimps between the single yarns of the false twisted yarns are opened in order to improve the see-through performance in a wet state. In a wet state, water intervenes in the voids in the woven or knitted fabric, which increases the light transmission property and lowers the see-through property. If the crimps are open, water will enter the voids between the single fibers and no water will remain in the voids in the woven or knitted fabric, so that the see-through performance will not easily deteriorate in a wet state. Confounding is effective in order to open the crimps more greatly. In the false twisted yarn of the present invention, by imparting a degree of entanglement of 30 k / m or more, a convergent portion is formed in a part of the crimp, but at the same time, the open fiber form can be fixed, so that it is in a wet state. It is possible to improve the see-through performance of. Further, when the degree of entanglement exceeds 180 pieces / m, the number of converging portions becomes too large, and light is easily transmitted from the confounding portions, and the transparency resistance is lowered. The preferred degree of entanglement is 50-150 / m.

Further, the false twisted yarn of the present invention is preferably used without twisting in order to maintain the crimped state, but may be twisted. The preferred twist is 50-700 T / m.

Next, a method for manufacturing the false twisted yarn and the woven knitted fabric of the present invention will be described.

First, when spinning the raw yarn which is the main yarn of the false twisted yarn of the present invention, it is preferable to spin the highly oriented undrawn yarn. In order to improve the crimp ratio, the amorphous portion is preferably in a highly oriented state, and the spinning speed is preferably 2800 to 3500 m / min. On the other hand, in order to improve the passability of the false twist process, it is preferable that the yarn elongation is high in order to adjust the false twist tension. The preferred yarn elongation is 125-200%.

Subsequently, false twisting is performed on the highly oriented undrawn yarn. Any false twist condition can be selected as the false twist condition of the present invention. A spindle type, a friction disc type, or a belt nip type may be used for the twister, but a friction disc type that can be false twisted at high speed and has relatively little fiber cross-sectional deformation is preferable. In the case of a contact heater, the false twist temperature is preferably 170 to 220 ° C. in that strong crimping can be imparted. For the number of false twists, setting the false twist coefficient (number of false twists (T / M) x fineness (dtex) ^0.5 ) in the range of 27,000 to 33,000 gives strong crimping. It is preferable in that it can be done.

Further, after false twisting, entanglement can be imparted by an interlaced nozzle, and the yarn can be imparted with openness. The entanglement pressure is preferably 0.1 to 0.4 MPa in consideration of the balance between openness and convergence.

As for the yarn processing speed, the higher the productivity, the higher the productivity, which is preferable, but considering the stable workability, 100 to 800 (m / min) is preferable.

The false twisted yarn of the present invention produced in this manner is made into a woven fabric or a knitted fabric by using a known weaving method and knitting method. Any known structure can be applied as a woven structure or a knitted structure. In the present invention, woven fabrics and knitted fabrics are collectively referred to as "woven and knitted fabrics". The woven and knitted fabric of the present invention is not restricted by the structure or the density. In order to improve the see-through property in a wet state, a woven or knitted fabric using 30% or more of the false twisted yarn of the present invention is preferable. In particular, cellulosic filaments or spun yarns have low see-through resistance in a wet state. It is possible to improve the transparency.

As the loom used for weaving, commonly used models such as ordinary looms, rapiers, water jet rooms, and air jet rooms can be adopted without particular limitation.

Further, at the time of knitting, a commercially available knitting machine such as a circular knitting machine, a tricot machine and a Raschel machine can be used. When the false twisted yarn of the present invention is used for at least a part of the knitted yarn, it is necessary to optimize each tension for knitting. As the knitting structure, any design such as a tenjiku, smooth, punch, rib and half structure is possible.

Further, the dyeing process can be performed according to the dyeing process and conditions of a woven or knitted fabric using a general polyester or nylon false twisted yarn. If necessary, heat-resistant processing, shrink-proof processing, wrinkle-proof processing, flexible processing, weight reduction processing and the like may be performed.

Further, in the woven and knitted fabric of the present invention, if necessary, a small amount of resin material such as a softener, a radical scavenger, an antioxidant, a fluorescent whitening agent, an antibacterial agent, an ultraviolet absorber, a light stabilizer, a flame retardant, etc. It may contain a matting agent, an electric resistance inhibitor, a hard finishing agent, a morphological stabilizer, a water repellent agent, a water absorbing agent and the like.

Next, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples. The various measurement methods in the present invention are as follows.

1. 1. Fineness A skein for 100 times was prepared using a measuring machine with a frame circumference of 1.0 m, and the fineness was measured according to the following formula.
・ Fineness (dtex) = 100 times of skein weight (g) x 100

2. 2. Strength JIS L1013: 2010 (Chemical fiber filament yarn test method) Measured and calculated under the conditions of a grip interval of 20 cm and a tensile speed of 10 cm / min using an Instron type tensile tester according to 8.5.1.

3. 3. Degree of entanglement Degree of entanglement is the number of entangled parts per 1 m under tension of 0.1 cN / dtex. The pin was moved up and down in the longitudinal direction of the thread by the tension of / dtex, the distance moved was recorded as the non-entangled portion, and the portion where the pin stopped was defined as the entangled portion. This work was repeated 30 times, and the degree of entanglement per 1 m was calculated from the average value of the distances of the non-entangled portions.

4. Curing rate In a measuring machine with a circumference of 0.8 m, the thread is wound 10 times under a tension of 90 mg / dtex to remove the skein, then hung on a rod of 2 cm or less and left for about 24 hours. Wrap this skein in gauze, treat it with hot water at 90 ° C for 20 minutes under no tension, hang it on a stick of 2 cm or less, and leave it for about 12 hours. Hook one end of the skein after leaving it, apply the initial load and the measured load to the other end, hang it in the water, and leave it for 2 minutes. At this time, the initial load (g) = 1.8 mg / dtex, the measured load (g) = 90 mg / dtex, and the water temperature = 20 ± 2 ° C. Measure the inner length of the left-over skein and let it be L. Further, it is left for 2 minutes with only the initial load excluding the measured load, and the length inside the left skein is measured and used as L1. The crimp ratio was calculated by the following equation. This work was repeated 5 times and calculated by the average value.
Crisp rate (%) = {(L-L1) / L} x 100

5. See-through property JIS L1923: 2017 "See-through property evaluation method for textile products" Based on the method A (visual method), the see-through property in a dry state and a wet state was obtained. Level 4 or above is the acceptance standard.

6. Light fastness Using an undyed woven or knitted fabric, discoloration (ΔE) due to irradiation with a fade meter for 60 hours was measured using CM-3600d manufactured by Minolta. The light source was D65 and the viewing angle was 2 °. The acceptance criteria are 0.5 or less.

7. Process passability The operability during false twisting was evaluated (108 weights for 1 day), and the yarn breakage rate was judged according to the following criteria. ◎ and ○ are the acceptance criteria.
・ ◎: Thread break rate is less than 3% ・ ○: Thread break rate is 3% or more and less than 5% ・ △: Thread break rate is 5% or more and less than 10% ・ ×: Thread break rate is 10% or more 8. Flatness False twisted yarns were sampled at 5 points in the fiber axis direction, and cross-sectional micrographs were taken for each. For the photographed total fiber cross section, the ratio A / B of the length (A) of the longest part (major axis) and the maximum length (B) of the short axis orthogonal to the long axis is measured, and the total measurement is performed. Expressed as the average value.

9. Titanium oxide content JIS R9301-3-7: 1999: Calculated based on "Chemical analysis method-7: Titanium oxide quantification method (diantipyrylmethane absorptiometry (A method)).

<Example 1>
A round cross-section polyethylene terephthalate in which an outermost layer containing 0.7% by mass of anatase-type titanium oxide and an inner layer containing 15% by mass of rutile-type titanium oxide are arranged in a mass ratio of 20:80 is spun at a spinning speed of 3,000 (m). / Min) was spun to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 175%. Then, using a friction false twisting machine (ATF12: manufactured by TMT Machinery), the highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 500 m / min, the draw ratio is 1.7 times, and the heater temperature is 210 ° C. , False twist coefficient: 31,000, false twisting, then entanglement pressure: 0.3 MPa, interlacing processing, fineness: 84 dtex, flatness: 1.5, strength: 2.5 cN / dtex, crimp ratio : 27%, entanglement degree: 155 pieces / m processed yarn was obtained. At that time, the passability of the false twisting process was very good with little yarn breakage.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had very good see-through resistance not only in a dry state but also in a wet state, and also had very good light fastness, and was suitable as a see-through outer garment.

<Example 2>
A polyethylene terephthalate having a round cross section in which an outermost layer containing 1.8% by mass of anatase-type titanium oxide and an inner layer containing 20% by mass of rutile-type titanium oxide are arranged in a mass ratio of 20:80 is used at a spinning speed of 3,000 (m). / Min) was spun to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 175%. Then, using a pin false twisting machine (TH312: manufactured by Aiki Seisakusho), the above-mentioned highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 100 m / min, the draw ratio is 1.7 times, and the heater temperature is 220. False twisting is performed at ° C. and false twist coefficient: 33,000, and then interlacing is performed at entanglement pressure: 0.1 MPa, fineness: 84 dtex, flatness: 2.3, strength: 2.2 cN / dtex, crimping. Processed yarns having a coefficient of 43% and an entanglement degree of 39 pieces / m were obtained. At that time, the passability of the false twisting process was good with relatively few yarn breakages.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had good see-through resistance not only in a dry state but also in a wet state, and also had good light fastness, and was suitable as a see-through outer garment.

<Example 3>
The outermost layer containing 0.7% by mass of anatase-type titanium oxide, the inner layer containing 15% by mass of rutile-type titanium oxide, and the innermost layer containing 0.7% by mass of anatase-type titanium oxide were formed at 20:50:30. Polyethylene terephthalate having a round cross section arranged by mass ratio was spun at a spinning speed of 3,000 (m / min) to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 173%. Then, using a friction false twisting machine (ATF12: manufactured by TMT Machinery), the highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 500 m / min, the draw ratio is 1.7 times, and the heater temperature is 210 ° C. , False twist coefficient: 31,000, false twisting, then entanglement pressure: 0.2 MPa, interlacing processing, fineness: 84 dtex, flatness: 1.6, strength: 3.2 cN / dtex, crimp ratio A processed yarn having a ratio of 29% and a degree of entanglement of 90 pieces / m was obtained. At that time, the passability of the false twisting process was very good with little yarn breakage.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had very good see-through resistance not only in a dry state but also in a wet state, and also had very good light fastness, and was suitable as a see-through outer garment.

<Example 4>
The outermost layer containing 0.7% by mass of anatase-type titanium oxide, the inner layer containing 20% by mass of rutile-type titanium oxide, and the innermost layer containing 0.7% by mass of anatase-type titanium oxide were formed at 20:30:50. Polyethylene terephthalate having a round cross section arranged by mass ratio was spun at a spinning speed of 3,000 (m / min) to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 173%. Then, using a friction false twisting machine (ATF12: manufactured by TMT Machinery), the highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 500 m / min, the draw ratio is 1.7 times, and the heater temperature is 210 ° C. , False twist coefficient: 31,000, false twisting, then entanglement pressure: 0.2 MPa, interlacing processing, fineness: 84 dtex, flatness: 1.6, strength: 3.3 cN / dtex, crimp ratio A processed yarn having a ratio of 30% and a degree of entanglement: 75 pieces / m was obtained. At that time, the passability of the false twisting process was very good with little yarn breakage.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had good see-through resistance not only in a dry state but also in a wet state, and also had good light fastness, and was suitable as a see-through outer garment.

<Example 5>
A round cross-section polyethylene terephthalate in which an outermost layer containing 0.7% by mass of anatase-type titanium oxide and an inner layer containing 12% by mass of rutile-type titanium oxide are arranged at a mass ratio of 30:70 is used at a spinning speed of 3,000 (m). / Min) was spun to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 175%. Then, using a friction false twisting machine (ATF12: manufactured by TMT Machinery), the highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 500 m / min, the draw ratio is 1.7 times, and the heater temperature is 180 ° C. , False twist coefficient: 27,000, false twisting, then entanglement pressure: 0.2 MPa, interlacing processing, fineness: 84 dtex, flatness: 1.4, strength: 2.8 cN / dtex, crimp ratio A processed yarn of 20% and entanglement degree: 82 pieces / m was obtained. At that time, the passability of the false twisting process was very good with little yarn breakage.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had good see-through resistance not only in a dry state but also in a wet state, and also had very good light fastness, and was suitable as a see-through outer garment.

<Example 6>
Nylon 6 with a round cross section in which an outermost layer containing 0.7% by mass of anatase-type titanium oxide and an inner layer containing 15% by mass of rutile-type titanium oxide are arranged in a mass ratio of 20:80 is spun at a spinning speed of 3,000 (m). / Min) was spun to obtain a highly oriented undrawn yarn having a fineness of 100 dtex, 36 filaments and an elongation of 65%. Then, using a friction false twisting machine (ATF12: manufactured by TMT Machinery), the highly oriented undrawn yarn is fed from a feed roller, processing speed: 500 m / min, drawing ratio: 1.2 times, heater temperature: 180 ° C. , False twist coefficient: 30,000, false twisting, then entanglement pressure: 0.25 MPa, interlacing, fineness: 84 dtex, flatness: 1.4, strength: 2.9 cN / dtex, crimp ratio A processed yarn having a ratio of 35% and a degree of entanglement: 103 pieces / m was obtained. At that time, the passability of the false twisting process was very good with little yarn breakage.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 110 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had very good see-through resistance not only in a dry state but also in a wet state, and also had good light fastness, and was suitable as a see-through outer garment.

<Comparative Example 1>
A polyethylene terephthalate having a round cross section in which an outermost layer containing 0.7% by mass of anatase-type titanium oxide and an inner layer containing 15% by mass of anatase-type titanium oxide are arranged in a mass ratio of 20:80 is used at a spinning speed of 3,000 (m). / Min) was spun to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 175%. Then, using a friction false twisting machine (ATF12: manufactured by TMT Machinery), the highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 500 m / min, the draw ratio is 1.7 times, and the heater temperature is 210 ° C. , False twist coefficient: 31,000, false twisting, then entanglement pressure: 0.3 MPa, interlacing processing, fineness: 84 dtex, flatness: 1.5, strength: 2.4 cN / dtex, crimp ratio A processed yarn having a ratio of 26% and a degree of entanglement: 142 pieces / m was obtained. At that time, the passability of the false twisting process was very good with little yarn breakage.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had good see-through resistance not only in a dry state but also in a wet state, but its discoloration due to light resistance was large, and it was not suitable as outer clothing.

<Comparative Example 2>
A polyethylene terephthalate having a round cross section in which an outermost layer containing 2.3% by mass of anatase-type titanium oxide and an inner layer containing 15% by mass of rutile-type titanium oxide are arranged at a mass ratio of 20:80 is used at a spinning speed of 3,000 (m). / Min) was spun to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 175%. Then, using a friction false twisting machine (ATF12: manufactured by TMT Machinery), the highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 500 m / min, the draw ratio is 1.7 times, and the heater temperature is 210 ° C. , False twist coefficient: 31,000, false twisting, then entanglement pressure: 0.3 MPa, interlacing processing, fineness: 84 dtex, flatness: 1.5, strength: 2.2 cN / dtex, crimp ratio : 27%, entanglement degree: 133 k / m processed yarn was obtained. At that time, the passability of the false twisting process was difficult to produce due to many yarn breakages.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had very good see-through resistance not only in a dry state but also in a wet state, but the discoloration due to light resistance was a little noticeable, and it was not suitable as outer clothing.

<Comparative Example 3>
A round cross-section polyethylene terephthalate in which an outermost layer containing 0.7% by mass of anatase-type titanium oxide and an inner layer containing 15% by mass of rutile-type titanium oxide are arranged in a mass ratio of 20:80 is spun at a spinning speed of 3,000 (m). / Min) was spun to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 175%. Then, using a friction false twisting machine (ATF12: manufactured by TMT Machinery), the highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 500 m / min, the draw ratio is 1.7 times, and the heater temperature is 210 ° C. , False twist coefficient: 31,000, false twisting, then entanglement pressure: 0.05 MPa, interlacing processing, fineness: 84 dtex, flatness: 1.5, strength: 2.5 cN / dtex, crimping rate A processed yarn having a ratio of 30% and a degree of entanglement of 20 pieces / m was obtained. At that time, the passability of the false twisting process was very good with little yarn breakage.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric was good in a dry state, but the see-through property in a wet state was lowered, and the see-through outer garment was unsuitable.

<Comparative Example 4>
A round cross-section polyethylene terephthalate in which an outermost layer containing 0.7% by mass of anatase-type titanium oxide and an inner layer containing 15% by mass of rutile-type titanium oxide are arranged in a mass ratio of 20:80 is spun at a spinning speed of 3,000 (m). / Min) was spun to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 175%. Then, using a friction false twisting machine (ATF12: manufactured by TMT Machinery), the highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 500 m / min, the draw ratio is 1.7 times, and the heater temperature is 210 ° C. , False twist coefficient: 31,000, false twisting, then entanglement pressure: 0.4 MPa, interlacing processing, fineness: 84 dtex, flatness: 1.6, strength: 2.3 cN / dtex, crimp ratio : 22%, entanglement degree: 193 pieces / m processed yarn was obtained. At that time, the passability of the false twisting process was very good with little yarn breakage.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had low see-through resistance in both dry and wet states, and was unsuitable as a see-through outer garment.

<Comparative Example 5>
A round cross-section polyethylene terephthalate in which an outermost layer containing 0.7% by mass of anatase-type titanium oxide and an inner layer containing 10% by mass of rutile-type titanium oxide are arranged at a mass ratio of 20:80 is spun at a spinning speed of 3,000 (m). / Min) was spun to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 175%. Then, using a pin false twisting machine (TH312: manufactured by Aiki Seisakusho), the above-mentioned highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 100 m / min, the draw ratio is 1.7 times, and the heater temperature is 220. False twisting is performed at ° C. and false twist coefficient: 34,000, and then interlacing is performed at entanglement pressure: 0.1 MPa, fineness: 84 dtex, flatness: 2.5, strength: 3.8 cN / dtex, crimping. Processed yarns having a coefficient of 47% and an entanglement degree of 39 pieces / m were obtained. At that time, the passability of the false twisting process was good with relatively few yarn breakages.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had low see-through resistance in both dry and wet states, and was unsuitable as a see-through outer garment.

<Comparative Example 6>
A flat cross-section polyethylene terephthalate in which an outermost layer containing 0.7% by mass of anatase-type titanium oxide and an inner layer containing 35% by mass of rutile-type titanium oxide are arranged at a mass ratio of 20:80 is used at a spinning speed of 3,000 (m). / Min) was spun to obtain a highly oriented undrawn yarn having a fineness of 140 dtex, 36 filaments and an elongation of 173%. Then, using a friction false twisting machine (ATF12: manufactured by TMT Machinery), the highly oriented undrawn yarn is fed from a feed roller, and the processing speed is 500 m / min, the draw ratio is 1.7 times, and the heater temperature is 170 ° C. , False twist coefficient: 26,000, false twisting, then entanglement pressure: 0.2 MPa, interlacing processing, fineness: 84 dtex, flatness: 2.9, strength: 1.4 cN / dtex, crimp ratio A processed yarn having a ratio of 14% and a degree of entanglement: 78 / m was obtained. At that time, the passability of the false twisting process was very difficult to produce due to the large number of yarn breakages.

After that, the above yarns are used as warp and weft yarns to weave a plain woven fabric with an air jet loom, and then the obtained woven fabric is spread and continuously scoured at 98 ° C, relaxed at 120 ° C, and finished at 160 ° C. , The product had a processing density (warp: 130 threads / 2.54 cm, weft threads: 110 threads / 2.54 cm).

The obtained woven fabric had good see-through resistance not only in a dry state but also in a wet state, but its discoloration due to light resistance was large, and it was not suitable as outer clothing.

According to the present invention, it is possible to provide a false plyed yarn and a woven or knitted fabric having excellent see-through resistance and fastness in a wet state and excellent passability in a manufacturing process. As a result, such a woven fabric is excellent not only in transparency but also in heat shielding property and UV blocking property, and can be suitably used for outer applications such as casual clothing, formal clothing, uniform clothing, and sports clothing.

Claims (6)

It has an outermost layer having a titanium oxide content of 0 to 2% by mass and an inner layer having a titanium oxide content of 11 to 30% by mass. False twisted yarn characterized by being ke / m. The falsely twisted yarn according to claim 1, wherein the flatness is 2.5 or less. The false plying according to claim 1 or 2, wherein the crimp ratio is 25 to 45%. The false plying according to any one of claims 1 to 3, wherein an innermost layer portion having a titanium oxide content of 0 to 2% by mass is provided inside the inner layer portion. A woven or knitted fabric using the false twisted yarn according to any one of claims 1 to 4. The woven or knitted product according to claim 5, wherein the false twisted yarn and the cellulose fiber are interwoven or knitted.