JP7205161B2 - Polyester deformed cross-section partially fused false twisted yarn - Google Patents

Description

TECHNICAL FIELD The present invention relates to a partially fused false-twisted polyester irregular cross-section yarn that has excellent water absorbency and anti-see-through properties, a strong embossed feel, and a reduced crispness compared to conventional partially fused false-twisted yarn.

Synthetic fibers are widely used in the field of general clothing because they have mechanical properties and various excellent properties such as durability and ease of handling. Among them, a large number of false-twisted textured yarns in which synthetic multifilaments are partially fused have been developed for natural texture fabrics in order to impart firmness, stiffness, crispness, and dryness. In addition, it is expected to develop into a fabric that touches the skin due to the dry and cool feeling derived from the fused part. In particular, materials for spring and summer use are required to absorb sweat and dry quickly, but many fused false twisted yarns have the drawback of poor water permeability and low water absorption.

Therefore, in Patent Document 1, two-stage stretching is performed for the purpose of softening the surface of the fabric and improving water absorption. That is, it proposes a method in which uneven drawing is performed in the first step and only the thick portion is fusion-bonded and false-twisted in the second step, thereby shortening the untwisted portion and reducing the ratio. In this proposal, it was confirmed that voids are generated in the untwisted portion, and the voids improve water absorption.

Further, in Patent Document 2, in addition to giving depth to the color and expressing a unique texture, it is expected to improve water absorption, and a modified cross-section is proposed.

JP 2014-25189 A JP 2013-181250 A

However, the technique described in Patent Document 1 proposed above has a small outer diameter ratio between the untwisted part and the over-untwisted part, and is characterized by a flat surface feeling. There was a problem with opacity. Furthermore, in both Patent Documents 1 and 2, the outer diameter ratio of the untwisted portion to the over-untwisted portion is small, and the unevenness in the longitudinal direction of the yarn is small, so that the woven and knitted fabric has a low wrinkled feel. As a result, the fused portion is likely to come into contact with the skin, is hard to the touch, and leaves a crisp feeling.

Therefore, the object of the present invention is to provide a polyester irregular cross-section partially fused temporary fabric that has high water absorbency when made into a fabric, has excellent anti-transparency, and has a strong embossed feel, so that it can be soft to the touch when made into a fabric. To provide a twisted yarn.

In order to solve the above-mentioned problems, the polyester modified cross-section partially fused false twisted textured yarn of the present invention has a cross section of a single fiber having a cross-sectional shape with 3 to 6 protrusions, and a yarn in the over-untwisted portion. The outer diameter ratio obtained by dividing the average outer diameter by the yarn average outer diameter of the untwisted portion is 1.40 to 2.15 , and the untwisted portion has a porosity of 20 to 90%. and

In the partially fused false twisted polyester yarn of the present invention, the fusion rate between single yarns in the over-untwisted portion is more preferably 0 to 14%.

Further, the concentration of titanium oxide contained in the polyester modified cross-section partially fused false twisted yarn of the present invention is preferably 0.2 to 5.0% by mass.

Furthermore, in the polyester modified cross-section partially fused false twisted textured yarn of the present invention, the average ununtwisted ratio is 8.0 to 25.0% and the average ununtwisted length is 1.0 to 5.5 mm. is preferred.

According to the present invention, it is possible to obtain a woven or knitted fabric that has high water absorbency and anti-transparency when made into a fabric, has a strong embossed feel, and has a soft surface feel. The problems with conventional partially fused false-twisted textured yarn are that it has a small outer diameter ratio, low transparency when made into fabric, lacks texture, and is hard to the touch. However, according to the polyester modified cross section partially fused false twisted textured yarn of the present invention, the outer diameter of the over untwisted portion can be increased due to the effect of increasing the bulkiness by forming the modified cross section. In addition, by using low fusion, the fusion-bonded portion of the over-untwisted portion was reduced and the outer diameter ratio was increased. Due to such a fiber form, when it is made into a fabric, it is excellent in anti-transparency, has a strong texture, and the bulky over-untwisted part touches the skin, so it is possible to provide a textured yarn that has a soft touch. Furthermore, the modified cross section improves the water absorbability, and the increased outer diameter ratio improves the water diffusibility in the longitudinal direction of the yarn, resulting in a textured yarn with a higher water absorbency than conventional yarns.

This is an example of a suitable false twisting process for obtaining the partially fused polyester irregular cross section false twisted yarn of the present invention. It is an example of an undrawn yarn cross section of the partially fused false-twisted textured polyester irregular cross-section yarn of the present invention.

In the polyester modified cross-section partially fused false-twisted textured yarn of the present invention, an untwisted portion having a twist in the twist direction and an over-untwisted portion having a twist in the opposite direction are alternately present in the longitudinal direction of the yarn.

The polyester modified cross-section partially fused false twisted textured yarn of the present invention has a cross-sectional shape having 3 to 6 protrusions on the cross-section of the single fiber. When the cross section has three or more protrusions, recesses are formed between multiple protrusions, fine voids are generated between single yarns or within single yarns, and the effect of capillary action increases, resulting in water absorption. becomes higher. In addition, the light scattering effect is increased, and the anti-transparency is enhanced. Furthermore, by increasing the outer diameter of the cross section of the single yarn, a bulky effect is created, and the average outer diameter of the yarn in the over-untwisted part increases, and when it is made into a fabric, the mesh becomes tight, so the anti-see-through property increases. . On the other hand, when the number of protrusions is 6 or less, the protrusions of other single yarns enter all the concave portions of the single yarn during false twisting, and fusion within the single yarn does not occur, so the cross-sectional shape of the single yarn is maintained. is preferable because it produces a bulky effect and enhances water absorbency, anti-transparency, and embossed texture. In addition, there is less entanglement of the convex portions during fusion bonding, making it easier to create voids in the untwisted portion during untwisting or additional drawing. By setting the content within such a range, a woven or knitted fabric having high water absorbency, anti-transparency, and a strong embossed texture when made into a fabric and having a soft surface texture can be obtained. More preferably, it is 4-5. Here, a convex portion is defined by a straight line connecting the deepest points of adjacent concave portions in the cross section of a single fiber, and a short side of a line connecting two adjacent deepest points along the cross section. It is the cross-sectional part where

The polyester modified cross-section partially fused false twisted textured yarn of the present invention has an outer diameter ratio (hereinafter referred to as outer diameter ratio) is 1.40 to 2.15. If the outer diameter ratio is 1.40 or more, the unevenness in the longitudinal direction of the yarn increases, and when the fabric is made into a fabric, the unevenness on the surface of the fabric increases and the embossed feeling becomes stronger. In addition, since the outer diameter is large, it is easy to clog and has excellent anti-transparency properties. In addition, the water is not retained in the untwisted portion, and diffusion to the over-untwisted portion is promoted, thereby improving the water absorbing effect. On the other hand, by setting the outer diameter ratio to 2.15 or less, the effect of capillary action in the over-untwisted part can be expected, so that the water absorption is improved.
By setting the content within such a range, a woven or knitted fabric having high water absorbency, anti-transparency, strong embossed texture, and soft surface texture can be obtained. More preferably, it is 1.60 to 2.00.

It is preferable that the false-twisted textured polyester irregular cross-section partially fused yarn of the present invention has a fusion rate between single yarns in the over-untwisted portion of 0 to 14%. By setting the inter-filament fusion rate to 14% or less, in addition to the bulky effect due to the modified cross-section of the over-untwisted portion, it is possible to develop a soft texture on the surface when made into a fabric. More preferably, it is 0 to 9%.

In the polyester modified cross-section partially fused false twisted textured yarn of the present invention, the space not occupied by the yarn in the minimum inclusion circle of the untwisted portion cross section is void, and the void ratio of the untwisted portion cross section is 20 to 90%. Preferably. If the porosity is 20% or more, water absorption is not hindered in the intermittently present untwisted portions, and the synergistic effect of the irregular cross section and outer diameter ratio described above significantly improves the water absorption of the fiber as a whole. On the other hand, when the porosity is 90% or less, the effect of capillary action in the untwisted portion can be expected, which is preferable because the water absorption is improved. More preferably, it is 30-75%.

The polyester irregular cross section partially fused false twisted textured yarn of the present invention preferably contains titanium oxide particles in a proportion of 0.2 to 5.0% by mass. When it is 0.2% by mass or more, sufficient anti-transparency can be visually observed when it is made into a fabric. The greater the amount of titanium oxide, the better the anti-transparency. Further, when the content is 5.0% by mass or less, troubles such as abrasion of guides and rollers do not occur in the spinning property and manufacturing process, which is preferable. More preferably, it is 1.0 to 3.5% by mass.

The polyester modified cross-section partially fused false twisted yarn of the present invention preferably has an average untwisted ratio of 8.0 to 25.0%. When the average untwisted ratio is 8.0% or more, the water absorption is improved due to the capillary action of the untwisted portion and the diffusion effect of the over-untwisted portion. On the other hand, when it is 25.0% or less, the diffusibility is increased, the water absorbency is improved, and the effect of increasing the bulk of the over-untwisted portion can be expected, which is preferable because the anti-see-through property is improved. In addition, the possibility of touching the untwisted part of the fabric becomes low, and the fabric feels soft to the touch. More preferably, it is 8.0 to 20.0%.

The polyester modified cross-section partially fused false twisted textured yarn of the present invention preferably has an average untwisted length of 1.0 to 5.5 mm. When the average untwisted length is 1.0 mm or more, the effect of capillary action can be expected. On the other hand, when the length is 5.5 mm or less, the untwisted portion is short, and when the fabric is made into a fabric, the transparency is high and the touch is soft. Moreover, it is preferable because the diffusibility is improved and the water absorption is improved. More preferably, it is 1.0 to 4.0 mm.

Next, a method for producing the polyester modified cross-section partially fused false twisted textured yarn of the present invention will be described.

The raw material polymer used in the present invention is polyester, and polyethylene terephthalate can be preferably used from the viewpoint of mechanical properties and fabric texture.

A partially oriented undrawn yarn (multifilament) can be obtained by melt-spinning these by a conventional method. That is, the partially oriented undrawn yarn is obtained by melting a raw material polymer at a temperature of preferably 275 to 300° C., discharging from a spinneret, forming a yarn, cooling the yarn by blowing cooling air, and converging. After that, an oil agent and entanglement are applied, and a wound package can be obtained. Partially oriented undrawn yarn is generally spun and wound at a spinning speed of about 2000 to 4000 m / min, and is not in a state where portions where polymer molecular chain orientation is advanced and portions where it is not mixed. It is a state of uniform molecular chain orientation in the longitudinal direction of the strip.

The partially oriented undrawn yarn is preferably spun at a spinning speed of 2500 to 3000 m/min. By setting the spinning speed to 2,500 m/min or more, the fusion between single yarns is not too strong, and a yarn having lightly fused untwisted portions can be obtained. By setting the spinning speed to 3000 m/min or less, fusion between single yarns is likely to occur.

It is preferable that the partially oriented undrawn yarn has the same number of recesses and protrusions in the cross section and has an irregularity of protrusions of 0.5 to 5.0. By setting the irregularity of convex portion to 0.5 or more, fusion bonding between single yarns is likely to occur. On the other hand, when the convex irregularity is 5.0 or less, fluffing, cross-sectional collapse, and fusion within a single yarn do not occur during false twisting, and processing can be performed without impairing water absorbency. The convex irregularity is described in the evaluation method of Examples.

Then, the partially oriented undrawn yarn is drawn and false-twisted to obtain the polyester modified cross-section partially fused false-twisted textured yarn of the present invention. Normally, draw false twisting is a processing method in which a multifilament partially oriented undrawn yarn is drawn and false twisted. The yarn is twisted while being heated and then untwisted to give a bulky texture.

The polyester modified cross-section partially fused false twisted textured yarn of the present invention is processed at a false twist heater temperature near the melting point of the polymer when the multifilament is drawn and false twisted, so that the single yarn is heated during twisting. A light fusion occurs between the strands and becomes an untwisted part. In addition, only weakly fused portions between single yarns are unfused during untwisting, forming over-untwisted portions. Furthermore, by additionally drawing after false twisting, the fusion bonding between single yarns is further destroyed, the void ratio in the untwisted portion is improved, and the fusion ratio between single yarns in the over-untwisted portion is 0 to 14%. It is possible to obtain the polyester modified cross-section fused false twisted yarn of the present invention.

As an example of a specific manufacturing method, the temperature of the false twisting heater (first heater, FIG. 1-1) is preferably 225 to 235° C. from the viewpoint of fusion bondability of the polyethylene terephthalate polymer. False twisting is performed by bringing the yarn into contact with a rotating friction disk (Fig. 1-2). The rotation speed of the disk is preferably 3800-4600 rpm. The untwisted length can be controlled to 1.0 to 5.5 mm by setting such a disk rotation speed. After false twisting, the torque of the yarn is removed using the second heater (Fig. 1-3), and additional drawing (between Figs. 1-4 and 5) is performed before winding, so that the untwisted part, This makes it possible to improve the voids in the untwisted part.

It is preferable that the drawing false twisting ratio is 1.30 to 1.50 times and the additional drawing ratio is 1.05 to 1.20 times. By setting such stretching conditions, it becomes possible to control the outer diameter ratio to 1.40 to 2.15.

Next, the polyester modified cross-section partially fused false twisted textured yarn of the present invention will be described in detail with reference to examples. Each measured value and evaluation used in Examples and Comparative Examples were determined by the following measurement methods.

<Yarn outer diameter ratio>
The average outer diameter of the untwisted part and the over-untwisted part was measured using an FPD-500 manufactured by Toray Engineering Co., Ltd. at a measurement speed of 3.0 m / min and a measurement length of 6.0 m. An optical sensor was used to discriminate between an untwisted portion with a high density and a small outer diameter of the yarn and an over-untwisted portion with a low density and a large outer diameter of the yarn. The average outer diameter is the average value of the measured outer diameters of the untwisted portion and the over-untwisted portion within the measurement length of 6.0 m, and the outer diameter ratio was calculated using the following formula.
Outer diameter ratio = average outer diameter of over-untwisted portion/average outer diameter of untwisted portion.

<Fusion rate between single yarns in over-untwisted part>
An embedding agent consisting of paraffin, stearic acid, and ethyl cellulose was melted, and after the polyester stretched false twisted yarn was introduced, it was allowed to stand at room temperature to solidify. I inspected it. If the boundary between the single fibers has disappeared, it is assumed to be fused. The fusion rate of the untwisted part was calculated by the following formula. This measurement was performed on 10 randomly selected over-untwisted portions, and the average value was taken as the fusion rate.
Fusion ratio (%) of over-untwisted portion=number of fused single fibers/total number of single fibers×100.

<Porosity of untwisted portion>
The radius was calculated from the untwisted portion average outer diameter described above, and the minimum inclusive circle cross-sectional area of the untwisted portion cross section was calculated as the untwisted portion cross-sectional area. Furthermore, the cross-sectional area of the untwisted portion at a porosity of 0% was calculated by Equation 1 below, and the porosity was calculated by Equation 2 below. The porosity was calculated with a density of 1.35 g/cm ² .
Untwisted cross-sectional area (cm ² ) at 0% porosity = (total fineness (dtex)/1.35)/10000 Equation 1
Porosity (%) of untwisted portion={(cross-sectional area of untwisted portion/cross-sectional area of untwisted portion at 0% porosity)−1}×100 Equation 2.

<Titanium oxide content>
A sample of 5 g of the textured yarn of the present invention was placed in a porcelain crucible and incinerated at 1000° C. using an electric furnace.

<Average length of untwisted part and untwisted ratio>
The average length of the untwisted portion and the untwisted ratio were measured using an FPD-500 manufactured by Toray Engineering Co., Ltd. at a measurement speed of 3.0 m / min and a measurement length of 6.0 m. An optical sensor was used to discriminate between an untwisted portion having a high density and a small yarn outer diameter and an over-untwisted portion having a low density and a large yarn outer diameter. The average length of the untwisted part is the average value obtained by measuring the untwisted length between the measured lengths of 6.0 m, and the untwisted ratio is the longitudinal direction of the yarn between the measured lengths of 6.0 m. is the ratio of the untwisted part to the

<Convex irregularity>
An embedding agent consisting of paraffin, stearic acid, and ethyl cellulose is melted, and a polyester partially oriented undrawn yarn is introduced and solidified by standing at room temperature. inspected. As shown in FIG. 2, the distance a between the deepest points of adjacent recesses in the cross section of a single yarn and the distance b of a perpendicular line drawn perpendicular to the straight line a from the apex of the protrusions were determined and calculated from the following formula. This calculation was performed using three single filament cross-section samples, and the average value of all convex portions was taken as the irregularity of convex portions.
Convex irregularity = b/a.

<Water absorption height of fiber>
A tubular knitted yarn to be evaluated (basis weight: 80 to 90 g/m ² ) was prepared, refined, and measured according to the JIS-L-1907:2010 Baylek method. This test was measured using 10 samples, the average value was calculated, and 75 mm or more was regarded as good for water absorption.

<Anti-transparency>
Using an SM color computer manufactured by SUGA Co., Ltd., a sample (a pattern with a hole in the center of the tubular knitted fabric was passed through, and the basis weight of the tubular knitted fabric was set to 80 to 90 g / m ² ). , the L* value when measuring the central portion of the sample with a white board attached to sandwich the sample was Lw1, and the L* value when the blackboard was attached was Lb. Further, the L* value of only the white board measured without mounting the sample was Lw, and the L* value of only the blackboard was Lb, and the anti-see-through degree was calculated from the following equation. In the results, 75% or more was considered to be good in anti-transparency.
Anti-transparency (%)=100−{(Lw1−Lb1)/(Lw−Lb)}×100.

<Evaluation of texture and softness>
A woven fabric was produced using the fusion-bonded drawn false-twisted textured yarn, and the embossed feeling and softness were evaluated by 10 panelists on a scale of 1 to 10, and evaluated according to the following four levels.
○○: The average value of 10 panelists is 9 points or more ○: The average value of 10 panelists is 7 points or more and less than 9 points △: The average value of 10 panelists is 5 points or more and less than 7 points ×: 10 people of panelists with an average score of less than 5 points.

(Example 1)
Using a spinneret designed to have an X-shaped pore shape and a convex irregularity of 1.7 in the cross section of the spun undrawn yarn, melt spinning was performed at a spinning speed of 2700 m / min to obtain a fineness of 140 dtex. A polyethylene terephthalate partially oriented undrawn yarn having a titanium oxide content of 2.2% by mass was obtained. In the false twisting process, a contact heating element (first heater), a contact cooling device at 25°C, a friction disk false twisting device, and two rollers (3rdFR, 4thFR) are used to set the temperature of the first heater to 230°C. , the draw ratio was 1.45 times, and the additional draw ratio (between 3rdFR and 4thFR) was 1.12 times to obtain a polyester modified cross-section fusion-bonded false-twisted textured yarn. The water absorption height was 90 mm and the anti-transparency was 90%. In addition, the woven fabric produced from the obtained textured yarn had good embossed texture and soft texture. Table 1 shows the results.

(Example 2)
The procedure was carried out in the same manner as in Example 1, except that the shape of the spinneret hole was changed to a Y-shaped cross section having three protrusions. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 1 shows the results.

(Example 3)
The procedure was carried out in the same manner as in Example 1, except that the hole shape of the spinneret was a *-shaped cross section having six projections. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 1 shows the results.

(Example 4)
The procedure was carried out in the same manner as in Example 1, except that the titanium oxide concentration was changed to 1.2% by mass. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 1 shows the results.

(Example 5)
The procedure was carried out in the same manner as in Example 1, except that the titanium oxide concentration was changed to 4.5% by mass. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 1 shows the results.

(Example 6)
The same procedure as in Example 1 was repeated except that the spinning speed was 3000 m/min, the draw ratio was 1.42, the 1HT temperature was 225°C, and the additional draw ratio was 1.20. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 1 shows the results.

(Example 7)
The same procedure as in Example 1 was repeated except that the spinning speed was 2500 m/min, the draw ratio was 1.47 times, the 1HT temperature was 235°C, and the additional draw ratio was 1.05 times. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 1 shows the results.

(Example 8)
The procedure was carried out in the same manner as in Example 1, except that the 1HT temperature was 235° C., the additional drawing ratio was 1.05 times, and the irregularity of convex portions of the cross section of the single yarn was 0.7. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 2 shows the results.

(Example 9)
The procedure was carried out in the same manner as in Example 1, except that the 1HT temperature was 225° C., the additional drawing ratio was 1.20 times, and the irregularity of convex portions of the cross section of the single yarn was 4.8. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 2 shows the results.

(Example 10)
The same procedure as in Example 1 was carried out except that the 1HT temperature was 225° C., the additional drawing ratio was 1.20 times, and the disk rotation speed was 4000 rpm. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 2 shows the results.

(Example 11)
The same procedure as in Example 1 was repeated except that the 1HT temperature was 235° C., the additional drawing ratio was 1.05 times, and the disk rotation speed was 4500 rpm. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 2 shows the results.

(Example 12)
It was carried out in the same manner as in Example 1 except that the 1HT temperature was 225° C. and the additional drawing ratio was 1.20 times. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 2 shows the results.

(Example 13)
It was carried out in the same manner as in Example 1 except that the 1HT temperature was 235° C. and the additional drawing ratio was 1.05 times. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 2 shows the results.

(Example 14)
The procedure was carried out in the same manner as in Example 1, except that the titanium oxide concentration was changed to 0.1% by mass. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 3 shows the results.

(Example 15)
The same procedure as in Example 1 was repeated except that the 1HT temperature was 235° C., the additional draw ratio was 1.05 times, and the spinning speed was 2500 m/min. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 3 shows the results.

(Example 16)
The same procedure as in Example 1 was repeated except that the draw ratio was 1.42 times, the 1HT temperature was 235° C., the additional draw ratio was 1.05 times, and the convex irregularity was 0.4. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 3 shows the results.

(Example 17)
The same procedure as in Example 1 was repeated except that the 1HT temperature was 225° C., the additional drawing ratio was 1.20 times, and the spinning speed was 3000 m/min. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 3 shows the results.

(Example 18)
The same procedure as in Example 1 was carried out except that the 1HT temperature was 225° C., the additional drawing ratio was 1.20 times, and the disk rotation speed was 3900 rpm. The woven fabric produced from the obtained textured yarn had good texture and softness. Table 3 shows the results.

(Comparative example 1)
The procedure was carried out in the same manner as in Example 1, except that the shape of the spinneret hole was changed to a round cross-section with no projections. As a result, no untwisted portion was generated in the obtained textured yarn. The water absorption height was 15 mm and the anti-transparency was 80%. Also, the woven fabric produced from the obtained textured yarn had a good soft feel but no embossed feel. Table 4 shows the results.

(Comparative example 2)
The procedure was carried out in the same manner as in Example 1, except that the shape of the spinneret hole was changed to an octalobed cross-section having eight projections. As a result, the obtained textured yarn had fusion within the single yarn and was inferior in water absorbency. The woven fabric produced from the obtained textured yarn had a good soft feel, but no embossed feel. Table 4 shows the results.

(Comparative Example 3)
It was carried out in the same manner as in Example 1 except that the additional drawing ratio was set to 1.00 times. The resulting textured yarn had a small outer diameter ratio, and the fabric produced had good texture and softness, but low water absorbency. Table 4 shows the results.

(Comparative Example 4)
It was carried out in the same manner as in Example 1 except that the additional drawing ratio was set to 1.25 times. The resulting textured yarn had a large outer diameter ratio and a large void ratio in the untwisted portion, and the fabric produced had good texture and softness. Table 4 shows the results.

(Comparative Example 5)
False twisting was performed in the same manner as in Example 1 except that the out-draw stretching was performed at a draw ratio of 1.30 times, the in-draw draw ratio was set to 1.12 times, and the additional draw ratio was set to 1.00 times. rice field. The woven fabric produced from the obtained textured yarn had a good soft feel, but no embossed feel. Table 4 shows the results.

(Comparative Example 6)
False twisting was carried out in the same manner as in Example 1, except that the polymer used was a cationic dyeable copolymer. The woven fabric produced from the obtained textured yarn did not have texture or softness. Table 4 shows the results.

According to the present invention, it is possible to obtain a polyester modified cross-section fused false twisted textured yarn which is excellent in water absorbency and see-through resistance, has a strong grain feeling, and has a reduced crispness compared to conventional partially fused false twisted textured yarn. , can be suitably used for sports clothing and woven and knitted fabrics for spring and summer clothing.

Claims (4)

The cross section of the single fiber has a cross-sectional shape with 3 to 6 convex portions, and the outer diameter ratio obtained by dividing the yarn average outer diameter of the over-untwisted portion by the yarn average outer diameter of the untwisted portion. is 1.40 to 2.15 , and the untwisted part has a porosity of 20 to 90% . 2. The polyester deformed cross section partially fused false twisted yarn according to claim 1, wherein the fusion rate between single yarns in the over-untwisted portion is 0 to 14%. 3. The polyester modified cross-section partially fused false twisted yarn according to claim 1 or 2 , wherein the concentration of titanium oxide contained in the fiber is 0.2 to 5.0% by mass. The polyester modified cross-section partially fused false twist according to any one of claims 1 to 3 , wherein the average untwisted ratio is 8.0 to 25.0% and the average untwisted length is 1.0 to 5.5 mm. processed thread.

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