JP6507673B2 - Long and short composite yarn - Google Patents

Description

  The present invention relates to a long / short composite spun yarn having water-absorbing and diffusing properties, in which polyester staple fibers of different cross section are disposed on the sheath side and polyester-based multifilament fibers are disposed on the core side, and in particular, has a soft texture. The present invention relates to a long and short composite spun yarn capable of obtaining a good cloth for clothing applications, specifically, inner shirts, outer shirts, and pants.

  Heretofore, by using core-sheath type polyester flat cross-section fibers for uniforms, sports, outerwear, or industrial materials, a fabric having drapability and a dry feeling and capable of obtaining good screaking resistance and UV has been proposed. (See Patent Document 1). Specifically, a yarn is proposed in which the number of convex portions of the polyester flat cross-section fiber is three to six, and the concavo-convex portion of the flat-shaped outer peripheral portion is uniform. However, when the number of convex portions of the polyester flat cross-section fiber is less than six, the gap formed between adjacent fibers decreases, and there is a problem that the water absorbency and the fluid replacement performance become poor. Moreover, in this proposal, the uneven | corrugated height of a flat-shaped outer peripheral part is made uniform, and it can not have a space | gap of various sizes between fibers, and can not have the outstanding water absorbency, quick-drying property, and soft property.

  In addition, a multi-lobal polyester fiber is proposed in which the polyester is a copolymer comprising a dicarboxylic acid component and a glycol component, and the cross-sectional lateral shape is multi-leaf-like (see Patent Document 2). However, this proposal has a problem that although the polyester fiber is excellent in dyeability, it has a low profile degree of 0.05 to 0.08 and may be easily damaged by abrasion.

  Further, it is characterized in that the flat cross-section polyester short fiber is mixed with 20% by weight or more, the single fiber fineness is 1.5 to 5 denier, and the round cross-section polyester short fiber having a round fiber cross-section. A spun yarn has been proposed (see Patent Document 3). However, although this proposal can have a soft feeling, soft touch, soft feeling, and a refreshing feeling of hemp / rayon-like texture, it is a blend and it is difficult to improve the water-absorbing quick drying effect. There is a problem that

  In addition, 20 to 80% of flat cross section polyester fiber and 20 to 80% of cellulose fiber are blended together, and it has high absorbency, quick-drying and anti-squeaking function that could not be achieved only with natural fiber and cellulose fiber. A spun yarn has been proposed (see Patent Documents 4 and 5). However, in these proposals, although it is possible to obtain water absorbency and quick drying by using a flat-cross-section polyester-based fiber, there is a problem that there is a possibility that rapid blending can not be obtained due to blending.

JP, 2013-44055, A JP, 2012-136810, A Japanese Patent Application Laid-Open No. 8-60470 International Publication WO2014 / 132690 International Publication WO2014 / 156451

  Therefore, the object of the present invention is to have a soft texture while using polyester fiber which could not be achieved by the above-mentioned prior art, and further to absorb water, diffuse, and be transparent which natural fiber and cellulose fiber could not do. An object of the present invention is to provide a long and short composite spun yarn having many functions such as prevention property, ultraviolet shielding property and durability.

  As a result of intensive investigation on the above-mentioned problems, the present inventors focused on the gaps between the fibers. That is, in the patent documents 1 and 2 mentioned above, since there are few voids between fibers, a sufficient effect is not obtained in water absorption and diffusion. With regard to the water absorption and diffusivity using the irregular cross-section fiber, there is a concern that if the water absorption is high on one hand, the water will be kept as it is, and the body will be cooled while worn, It has been found that the space between fibers is very important because quick drying can be expected by increasing the chance of contact.

  Moreover, in the proposal of the above-mentioned patent document 3, although there is no glittery feeling, soft touch, soft tension, and a spun yarn fabric having a refreshing feeling and an effect on water absorption can be obtained. Sex does not appear.

  Therefore, in order to solve the above-mentioned problems, the present inventors have made it possible to absorb water by using a composite spun yarn in which a specific flat multi-leaf-type cross-section polyester-based short fiber is used in combination with a polyester multi-filament fiber having a large fineness. It reached the composite spun yarn with high diffusivity.

The present invention solves the above-mentioned problems, and the long-short composite spun yarn of the present invention has 60 to 80% by mass of flat multi-leaf cross section polyester-based short fibers on the sheath side, and polyester on the core side A composite spun yarn comprising 20 to 40% by mass of a multifilament fiber, wherein the flat multileaf polyester cross section on the sheath side is opposed with the maximum length A of the cross section as the axis of symmetry Assuming that the length of the biconvex convex apex-to-apex line segment which is the longest excluding the cross sectional maximum width B is E, the convexity ratio (E / B) represented by the following formula (1) is 0.6 to A long and short composite spun yarn characterized by satisfying the range of 0.9.
· Convex part ratio (E / B) (1)
According to a preferred embodiment of the long-short composite spun yarn of the present invention, the single-fiber fineness of the flat multi-leaf cross-section polyester-based short fiber disposed on the sheath side is in the range of 1.5 to 4.0 dtex, and the cross-sectional shape is Flat shape having 6 or more convex portions on the circumference, and flatness (A / B) shown by the following equation (2) is 2.0 to 3.0, and deformation degree shown by the following equation (3) (C / D) is 1.0 to 5.0, and the single fiber fineness of the polyester multifilament fiber disposed on the core side is in the range of 1.5 to 4.0 dtex, and it is 1 from the sheath single fiber fineness It is to have a fineness of not less than .03 times and less than 3.0 times.
Flatness (A / B) (2)
・ Deformation degree (C / D) ... (3)
(Where A is the maximum length of the cross section of the flat multi-lobal polyester short fiber, B is the maximum width of the cross section of the flat multi-lobal polyester short fiber, and C is a line connecting the apexes of adjacent convex portions in the maximum uneven portion. The length of D, and the length D of the maximum uneven portion respectively represent the length of a perpendicular drawn from the line connecting the apexes of adjacent convex portions to the bottom of the concave portion.)
In the present invention, the above-mentioned long and short composite spun yarns can be used to produce a fabric to be described later.

  According to the present invention, a long and short composite spun yarn having good water absorption and diffusion properties can be obtained. More specifically, according to the present invention, the polyester fiber has a soft texture while using a fiber, and furthermore, the water absorbability, the diffusion property, the transparency prevention property, the ultraviolet ray shielding property which can not be achieved with a natural fiber or a cellulose fiber. Thus, a long and short composite spun yarn having many functions such as durability and durability can be obtained.

  Further, according to the present invention, it is possible to obtain a woven / knitted fabric having excellent water absorbability and diffusibility, and soft texture having good pillability, which is obtained by using the long / short composite spun yarn of the present invention. .

  The long and short composite spun yarns of the present invention are suitably used for clothing applications, particularly fabrics such as inner shirts, outer shirts, pants, and woven and knitted fabrics such as sports and pants.

FIG. 1 is a cross-sectional view illustrating the cross-sectional shape of a flat multi-leaf cross-section polyester fiber provided in a long and short composite spun yarn of the present invention having a plurality of (eight) convex portions on the circumference of a fiber cross section. FIG. 2 is a cross-sectional view for illustrating the long / short composite spun yarn of the present invention.

  The long and short composite spun yarn of the present invention comprises 60 to 80% by mass of flat multi-leaf cross section polyester-based short fiber on the sheath side and 20 to 40% by mass of polyester-based multifilament fiber on the core side The flat multi-lobal cross-section polyester-based short fiber on the sheath side has the maximum length A of the cross-section as the axis of symmetry and excludes the cross-section maximum width B among the opposing biconvex peak line segments It is a long and short composite spun yarn in which the convex portion ratio (E / B) satisfies the range of 0.6 to 0.9, where E is the longest length.

  Examples of the polyester constituting the flat multi-lobal cross-section polyester-based short fiber and polyester-based multifilament fiber used in the present invention include polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate and copolymers thereof. Particularly preferably used polyester is polyethylene terephthalate.

  Next, flat multi-use cross-section polyester staple fibers and polyester multifilament fibers used in the present invention will be described.

  First, flat multi-lobal cross-section polyester short fibers are disposed on the sheath side of the long-short composite spun yarn of the present invention, and the short fibers are used in order to exert the effect of diffusing water absorbed when the fluff spreads outward. Be Further, although the details will be described later, the flat multiple-use cross-section polyester short fiber used in the present invention is a flat fiber having a cross-sectional shape preferably having six or more convex portions on the circumference. If the number of convex portions present on the circumference in the cross-sectional shape is less than six, voids formed between adjacent fibers decrease, and water absorbency, liquid retention, and diffusion become poor. In addition, when the cross-sectional shape is flat, it is possible to form a void between single fibers, and the water absorbency, the liquid retention property, and the diffusivity become good. Furthermore, by arranging the flat and wide cross-section polyester short fibers on the sheath side, the hair-falling property per single fiber is improved, so that a soft texture can be obtained in the case of using a fabric.

  In FIG. 1, an example of the single fiber cross-sectional shape of flat multi-lobal-cross-section polyester short fiber used by this invention is shown. FIG. 1 illustrates the cross-sectional shape of a flat multi-lobal polyester short fiber used in the present invention having a plurality of (eight) convex portions on the circumference of the fiber cross section.

  In FIG. 1, the maximum length A of the cross section of the flat multi-lobal polyester short fiber and the maximum width of the cross section of the flat multi-lobal polyester short fiber, and the convex portion intersecting perpendicularly with the maximum length A The length B of the line segment of maximum width connecting between the vertices is shown. Further, in FIG. 1, the length C connecting between the apexes of adjacent convex portions in the largest uneven portion, the length D of the perpendicular drawn to the apex of the concave portion from the line connecting the apexes of adjacent convex portions in the largest uneven portion, And, with the maximum length A as the axis of symmetry, the length E which is the longest except for the maximum width B is shown among the line segments between opposing convex portions of the convex portion.

  The flat multi-lobal cross-section polyester short fiber used in the present invention is preferably a flat polyester fiber having six or more convex portions in the cross-sectional shape of the fiber, and the number of convex portions is more preferably 7 to 13 And more preferably 8-12. Moreover, it is a preferable aspect that a convex part shape is a rounded shape from a viewpoint of touch property.

The flat multi-lobal cross-section polyester-based short fibers used in the present invention have the maximum length A of the cross section as the axis of symmetry, and the longest length excluding the maximum cross-section width B among the opposing convexes It is important to satisfy the convexity ratio shown by the following equation (1), where E is E.
Convex part ratio (E / B) = 0.6 to 0.9 (1).

  The above-mentioned convexity ratio (E / B) indicates the ratio of the maximum width B to the maximum convexity-to-apex length excluding the maximum width A, with the maximum length A as the axis of symmetry in the flat multilobal shape described above, This is meaningful as an index for measuring the degree of distortion of the substantially elliptical shape obtained when drawing a line connecting the apexes of the convex portions of the maximum widths B and E and the maximum length A. When the convex portion ratio is too small, the depth of the concave portion decreases, and the cross-sectional shape of the convex portion becomes as close as possible to a flat cross shape. Therefore, the capillary effect decreases, and the water absorbability and the diffusivity tend to decrease. In addition, when the skin is touched, the number of convex portions in contact is reduced because the shape approaches a flat cross shape, and the touch feeling and the softness tend to be reduced. Therefore, it is important that the convex portion ratio is 0.6 or more.

  On the other hand, when the ratio of convex portions is too large, when the irregularities of the fibers are polymerized, the number of portions completely clogged by the concave portions is increased, so that the voids are reduced, and the water absorptivity and the diffusivity tend to be reduced. Indicates Moreover, when the skin is touched, the shape becomes a shape close to a flat hexagonal shape, so that the number of convex portions in contact decreases, and the touch feeling and the softness tend to be lowered. From this, it is important that the convex portion ratio (E / B) is 0.9 or less. The convex portion ratio (E / B) is preferably 0.6 to 0.9 from the above viewpoint, and the convex portion ratio is more preferably 0.6 to 0.8 from the balance thereof. More preferably, it is 0.7-0.8.

  The convexity ratio (E / B) can be controlled by discharging at a temperature of 250 to 300 ° C. through a special type of spinneret and blowing and cooling air at a temperature of 10 to 25 ° C. it can.

In addition, the flat multi-lobal cross-section polyester short fiber used in the present invention has a flat multi-lobal cross-sectional shape in the single fiber cross-section of the fiber in the range of flatness shown in the following formula (2) and the following formula (3) It is a preferred embodiment to satisfy the range of the degree of profile shown.
Flatness (A / B) = 2.0 to 3.0 (2)
-Degree of deformation (C / D) = 1.0 to 5.0 (3).

  If the flatness is less than 2.0, it will be difficult to obtain a soft texture in which the fiber's hair-tumbling property is deteriorated. On the other hand, when the flatness exceeds 3.0, the feeling of stiffness is small and it tends to be loose, and the tendency to deteriorate the spinning property and the degree of deformation is shown. The flatness is more preferably 2.0 to 2.7, and still more preferably 2.0 to 2.5.

  The degree of heterogeneity represents the size of the concave portion between the convex portion and the convex portion in the above-described flat-type, and the larger the value, the smaller the concave portion, and the smaller the value, the larger the concave portion. doing. When the degree of deformation is large, the recesses are shallow and the gaps formed between the single fibers are also small, so that the water absorbability and the diffusivity tend to be lowered. Therefore, it is desirable that the degree of deformation is 5.0 or less. On the other hand, when the degree of deformation is too small, the recess of the fiber cross section tends to be bent and there is a tendency that the flat shape can not be maintained. Furthermore, there is a risk that the skin may be damaged when it rubs against the skin in order to make it more susceptible to fiber damage due to abrasion. From these facts, the degree of deformation is 1.0 or more. The degree of deformation is preferably in the range of 1.0 to 5.0 from the above-mentioned point, and the degree of deformation is more preferably in the range of 1.0 to 4.0 from the point of water absorption and diffusion, and further flat From the viewpoint of balance of shape retention and water absorption and diffusion, 2.0 to 4.0 is a more preferable embodiment.

  Similarly to the convexity ratio (E / B), the flatness (A / B) and the deformation (C / D) are also discharged at a temperature of 250 to 300 ° C. through a special shape spinneret. It can control by blowing and cooling the air of the temperature of 10-25 degreeC.

  The single fiber fineness of the flat multi-lobal cross-section polyester fiber used in the present invention is preferably 4.0 dtex or less. The single fiber fineness is more preferably 1.0 to 3.5 dtex, and still more preferably 1.2 to 3.5 dtex. When the single fiber fineness exceeds 4.0 dtex, the stiffness peculiar to polyester fiber is strong, so the stimulation of the touch feeling becomes strong, and the soft feeling may be impaired. Furthermore, since the voids formed between the fibers become too large, the capillary phenomenon weakens and the diffusibility of the liquid decreases, which tends to impair the dry feeling and the cool feeling when touching the skin. In addition, when the single fiber fineness is smaller than 1.0 dtex, there is a possibility that the process passability in the fabric manufacturing process is deteriorated and the productivity is lowered.

  Moreover, it is preferable that it is 30-64 mm from a viewpoint of a high-order processing process (fiber omission of a fabric), and, as for the fiber length of flat multi-leaf cross-section polyester short fiber used by this invention, More preferably, it is 35-51 mm.

  The flat multi-lobal cross-section polyester fiber used in the present invention can be produced, for example, by the following method.

  The polyester is melted, 250 through the spinneret consisting of specially shaped holes forming a flat multi-lobal cross section having 3 to 8 short axis slits perpendicular to the longest axis slit, having 400 to 1300 discharge holes. After discharging at a temperature of 300 ° C at a discharge rate of 200 to 500 g / min and blowing air at a temperature of 10 to 25 ° C in a flow of 30 to 100 m / min to cool, spin oil is applied and the take-up speed An undrawn yarn is obtained by once putting in a can at 900 to 1700 m / min. Then, after converging the tow of these undrawn yarns, after drying the tow of the obtained undrawn yarn at a draw ratio of 2.0 to 7.0 times and at a drawing temperature of 80 to 165 ° C. for 15 to 30 minutes And cutting to obtain flat cross-section polyester fiber.

  Next, the polyester fiber disposed in the core used in the present invention is a long fiber (multifilament). If the polyester fiber disposed in the core portion is a mixture of staple fibers, the fiber arrangement of the spun yarn becomes random in the manufacturing process, and the water absorption and diffusion effect can not be exhibited. By making the polyester-based fibers disposed in the core part into long fibers (multifilaments), it is possible to obtain long and short composite yarns in which the fibers are gathered and the water absorption and diffusion effect can be exhibited in the core-sheath structure.

  The single fiber fineness of the polyester-based multifilament fiber disposed in the core used in the present invention is also preferably 4.0 dtex or less, and 1.03 or more times the single fiber fineness of the flat multi-leaf cross section polyester fiber. Preferably it is less than 0 times. When the single fiber fineness of the polyester-based multifilament fiber disposed in the core portion is 1.03 times lower than the single fiber fineness of the flat multi-lobal cross section polyester fiber, the capillary phenomenon becomes weak and the water absorption effect can be exhibited but the liquid Due to the reduction of the diffusivity, the dry and cool feeling tends to be impaired when touching the skin. In addition, when the single fiber fineness becomes thinner than 1.0 dtex or 3.0 times or more than the single fiber fineness of the flat multi-leaf cross section polyester fiber, the process passability in the fabric manufacturing process becomes worse, and the productivity is lowered. There is a risk of

  The number of filaments and total fineness of the polyester-based multifilaments disposed in the core portion is preferably such that the number of cross-sectional fibers of the long-short composite spun yarn is 65 or more. When the number of cross-sectional fibers of the formed long and short composite spun yarn is 65 or less, problems such as breakage of the yarn during process passing may occur, and productivity may be lost.

  The cross-sectional shape of the single fiber of the polyester multifilament fiber having a core used in the present invention can be a round cross section, a flat cross section, a triangular cross section, a multilobal cross section, an X-type cross section and other modified cross sections.

  The polyester-based multifilament fiber used in the present invention can be produced, for example, by the following method.

  The polyester is melted, and it is discharged at a temperature of 250 to 300 ° C. at a discharge rate of 200 to 500 g / min through a spinneret having 300 to 1300 discharge holes and holes forming a circle, 10 to 25 ° C. After blowing air at a temperature of 30 to 100 m / min for cooling, a spinning oil is applied, and it is taken up at a take-up speed of 900 to 1700 m / min, and stored in a can to obtain an undrawn yarn. Then, after converging the tow of these undrawn yarns, after drying the tow of the obtained undrawn yarn at a draw ratio of 2.0 to 7.0 times and at a drawing temperature of 80 to 165 ° C. for 15 to 30 minutes , Take-up stretched yarn can be obtained.

  The single fiber strength of each of the flat multi-leaf cross-section polyester-based staple fibers and the polyester-based multifilament fibers used in the present invention is preferably 1.5 to 4.0 cN / dtex. When the single fiber strength is lower than 1.5 cN / dtex, process defects such as yarn breakage are likely to occur in the process of producing the fabric. In addition, when the single fiber strength is higher than 4.0 cN / dtex, the softness and the anti-pilling property become poor.

  The long and short composite spun yarn of the present invention comprises 60 to 80% by mass of flat multi-leaf cross section polyester-based short fiber on the sheath side and 20 to 40% by mass of polyester-based multifilament fiber on the core side It is.

  If the blend ratio of the flat-heavy cross-section polyester short fibers used in the present invention is less than 60% by mass, the polyester-based multifilament fiber having the core can not be covered, and the water absorption and diffusion effect can not be improved. Moreover, since the diffusive effect by capillary phenomenon becomes difficult to appear when the blend ratio of the flat and large cross-section polyester short fibers exceeds 80% by mass, the blend ratio of the flat and wide cross-section polyester short fibers is 60 to 80% by mass.

  The long / short composite spun yarn according to the present invention is a long / short composite spun yarn in which multifilament fibers and short fibers are integrated and twisted, and viewed from the cross section, the polyester-based multifilament fiber is inside the long / short composite spun yarn. Refers to a yarn that is included or distributed around the periphery.

  FIG. 2 illustrates a cross-sectional view of the long / short composite spun yarn of the present invention. In FIG. 2, the polyester-based multifilament fiber F is contained in the inside of the long and short composite spun yarn, or is distributed unevenly around the periphery. Specifically, in the case of the long-short composite spun yarn 1 in FIG. 2 (view of the left end), the polyester multifilament fiber F is covered with the flat multi-leaf cross-section polyester short fiber S in the cross-sectional shape of the long-short composite spun yarn It is disposed on the core side of long and short composite spun yarns (around). Further, the cross-sectional shape of the long-short composite spun yarn of the present invention is such that the polyester-based multifilament fiber F disposed on the core side is not always disposed at the center as in 1 (left end) in FIG. The cross-sectional arrangement of the polyester-based multifilament fiber F may be randomly formed in the longitudinal direction of the long and short composite spun yarn as shown in 2 of 2 (in the center) and 3 of FIG. 2 (in the left end). In the present invention, it is not important that the polyester-based multifilament fiber F is always arranged at the center of the long and short spun yarn cross section, but that the polyester-based multifilament fiber F which is a core single fiber is gathered. It is an important point in exerting water absorption quick drying.

  In the case of forming a core-sheath structure to produce the long / short composite spun yarn of the present invention, the core-sheath structure can be formed by various processes such as a spinning machine, a roving machine and a drawing machine.

Next, a method of producing the long and short composite spun yarn of the present invention will be described.
As a method of forming the long-short composite spun yarn of the present invention in which polyester multifilament fibers are disposed on the core side and flat multi-leaf cross section polyester short fibers are disposed on the sheath side, flat multi leaves disposed first on the sheath side The cross-section polyester staple fiber is slivered by a carding machine according to a conventional method, and the unevenness is eliminated in the drawing and roving steps to form a sliver. In addition, it is desirable that the step of mixing (blending) the polyester-based multifilament fiber disposed on the core side with the flat multi-use cross-section polyester short fiber is performed in a spinning machine. When polyester multifilament fibers and flat multi-use cross-section polyester short fibers are mixed in a process prior to a spinning machine, the arrangement of single fiber groups may be broken at the drawing portion, and water absorbency and diffusion may not be exhibited. The polyester-based multifilament that arranges the core side in the spinning machine is supplied from the upper part of the front roller, superimposed on a flat multi-leaf polyester short fiber bundle drafted on the nip line of the front roller, and real twist is added to make long and short composite spinning Produce yarn.

  It is desirable that the counts of long and short composite spun yarns according to the present invention be # 24 to # 100 (English cotton count). If the count is thinner than 100, the number of cross-sectional fibers is small, and yarn breakage may occur during production, resulting in poor productivity. Moreover, when using for an inner material or a shirt material, it is preferable that it is 30-53rd, and it is a more preferable aspect that it is 30-40.

  The twist coefficient of the long / short composite spun yarn of the present invention is preferably in the range of 3.0 to 4.5. If the twist coefficient is less than 3.0, there is a tendency that sufficient yarn strength can not be obtained, and there is a tendency for yarn breakage during spinning and a reduction in strength when made into a woven or knitted fabric. In addition, when the twist coefficient exceeds 4.5, not only is there a tendency for generation due to twisting back, but also there is a tendency for a coarse-hardened area to appear when it is made into a fabric.

  The fabric formed by using the long and short composite spun yarn of the present invention is preferably used as an inner shirt, an outer shirt, a pants and the like.

  Next, the composite spun yarn of the present invention will be specifically described by way of examples. The measurement and evaluation of characteristics and the like in the examples were performed by the following method. The measurement method conforms to JIS L1095 (2010 version). Moreover, the average value about 3 times of measurement frequency was taken except the method shown to JIS by each physical-property value in an Example.

(1) Single fiber fineness and fiber length:
The measurement method of the single fiber fineness and the fiber length was performed in accordance with JIS L1015 (2010 version).

(2) Number:
The measurement method of count was followed in accordance with JIS L1095 (2010 version).

(3) Evaluation of water absorbency of fabric:
The water absorptivity of the fabric was evaluated according to the measurement method of JIS L1907 (2010 edition, Byreck method). The contents of the evaluation are as follows, and in the present invention, "o" and "o" were passed.

:: 80 mm or more ○: 70 to 79 mm
:: 50 to 69 mm
X: 49 mm or less.

(4) Evaluation of quick drying of fabric:
In the fast drying evaluation of the fabric, a test piece left to stand for 24 hours in a greenhouse at 25 ° C. and a humidity of 40% RH is cut out into a 10 cm square to measure the mass (A). The test piece is immersed in ion-exchanged water for 30 seconds, and then one corner of the test piece is pinched with a forceps to remove it from the liquid. Similarly, the test piece taken out is left in the atmosphere of room temperature 25 ° C. and humidity 40% RH for 1 hour to be naturally dried, and the mass (B) is measured. The residual moisture content (C) is calculated by the following equation.
C (%) = (B-A) / A x 100
The evaluation is as follows, and in the present invention, "o" and "o" were taken as passing.
:: 30% or less ○: 31 to 40%
Δ: 41 to 50%
X: 51% or more.

(5) Texture (softness) evaluation:
In the texture evaluation, a test piece was cut out at 10 cm, and five test subjects were asked to hold the cut out test piece, and the score was evaluated according to the following criteria, and then the average score was calculated. In the present invention, "o" and "o" were accepted.
3 points: Soft texture 2 points: Texture 1 slightly harder 1 point: Hard texture ◎: 2.8 points or more ○: 2.4 to 2.7 points Δ: 1.9 to 2.3 points ×: 1.8 points Less than.

(6) Anti-pilling evaluation:
The evaluation of anti-pilling properties was conducted in accordance with JIS L 1076 (2012 method A). The anti-pilling property was determined based on the following criteria. In the present invention, "o" and "o" were accepted.
◎: 4.5 or more ○: 3.5 to 4 △: 2 to 3 × x 1.5 or less.

Example 1
(Production method of flat multi-leaf cross section polyester staple fiber)
A spinning temperature of 290 ° C. from a flat multi-lobal cross-section nozzle (486 holes) having five short-axis slits perpendicular to the longest-axis slit by a melt spinning apparatus using polyethylene terephthalate (PET) (melting point 252 ° C.) The mixture was discharged at 550 g / min and air was blown at a flow of 40 m / min at a temperature of 15 ° C. to be cooled, and then pulled at a speed of 1200 m / min to obtain an undrawn yarn. The undrawn yarn was converged, drawn at a draw ratio of 6.74 times, drawn at a drawing temperature of 90 ° C., crimped, dried at a temperature of 85 ° C., and cut to produce flat multi-lobal cross-section polyester short fibers .

(Method of producing polyester-based multifilament)
Using polyethylene terephthalate (PET) (melting point 252 ° C), discharge at 415g / min at a spinning temperature of 290 ° C from a round cross-sectional shape mouthpiece (336 holes) by a melt spinning apparatus, air at a temperature of 15 ° C is 70m After blowing and cooling with a flow of 1 / min, it was pulled at a speed of 1300 m / min to obtain an undrawn yarn. The undrawn yarn was converged and drawn at a draw ratio of 6.36 times at a drawing temperature of 90 ° C. to produce a polyester-based multifilament.

Flat multi-lobal cross section polyester short fiber with sheath part single fiber fineness is 1.7 dtex, fiber length is 51 mm, flatness is 2.2, heteromorphism is 1.8, convex ratio is 0 And a polyester-based multifilament fiber having a cross-sectional shape of 70 convex parts having eight convex parts and a polyester multifilament fiber having a single fiber fineness of 1.8 dtex and a number of 24 core parts, and a spinning machine Blended with (Toyota Ring Spinning Machine RX240 type), a cotton yarn count of 40s was obtained as a long and short composite spun yarn of 40s with a twist coefficient of 3.5. The long and short composite spun yarn thus obtained was used for warp and weft, and an air jet loom was used to obtain a plain weave having a warp density of 110 / 2.54 cm and a weft density of 76 / 2.54 cm. . The obtained plain weave was a fabric excellent in water absorption, quick drying, texture and anti-pilling properties. The results are shown in Tables 1 and 2.

Example 2
(Manufacturing method of flat multi-leaf cross section polyester staple fiber and polyester multifilament)
Flat multi-leaf cross-section polyester staple fibers and polyester multifilaments were produced in the same manner as in Example 1.

  Flat multi-lobal cross section polyester short fiber with sheath part single fiber fineness is 1.7 dtex, fiber length is 51 mm, flatness is 2.2, heteromorphism is 1.8, convex ratio is 0 60% by weight of a fiber having a convex portion with a cross-sectional shape of 8 and 40% by weight of a polyester-based multifilament fiber having a single fiber fineness of 1.8 dtex and a core of 33 in number, and a spinning machine Blended with (Toyota Ring Spinning Machine RX240 type), a cotton yarn count of 40s was obtained as a long and short composite spun yarn of 40s with a twist coefficient of 3.5. The long and short composite spun yarn thus obtained was used for warp and weft, and an air jet loom was used to obtain a plain weave having a warp density of 110 / 2.54 cm and a weft density of 76 / 2.54 cm. . The plain weave obtained was a woven fabric excellent in water absorption, quick drying, texture and anti-pilling properties. The results are shown in Tables 1 and 2.

Comparative Example 1
Flat multi-lobal cross-section polyester staple fiber having a single fiber fineness of 1.7 dtex and a fiber length of 51 mm, a flatness of 2.2, a heteromorphism degree of 1.8, a convexity ratio of 0.8, and a cross section 100% by mass of a fiber having eight convex portions in shape was used as a Yori coefficient of 3.5 to obtain a spun yarn of British cotton count 40s. The spun yarn was used for warp and weft, and an air jet loom was used to obtain a plain weave having a warp density of 110 / 2.54 cm and a weft density of 76 / 2.54 cm. The plain weave obtained was a woven fabric excellent in water absorption, quick drying, texture and anti-pilling properties. The results are shown in Tables 1 and 2.

Comparative Example 2
A polyester fiber having a single fiber fineness of 1.7 dtex, a fiber length of 51 mm, and a cross-sectional shape of a round-shaped round polyester-based short fiber is manufactured, and the obtained round polyester-based short fiber is used to have a twist coefficient of At 3.5, the English cotton count obtained 40s of spun yarn. The spun yarn was used for warp and weft, and an air jet loom was used to obtain a plain weave having a warp density of 110 / 2.54 cm and a weft density of 76 / 2.54 cm. The obtained plain weave fabric was a woven fabric having excellent anti-pilling properties but was inferior in water absorbency, fast drying and texture. The results are shown in Tables 1 and 2.

Comparative Example 3
Flat multi-lobal cross section polyester short fiber with sheath part single fiber fineness is 1.7 dtex, fiber length is 51 mm, flatness is 2.2, heteromorphism is 1.8, convex ratio is 0 .8, and 40% by mass of a fiber having eight convex sections in cross section, and 60% by mass of a polyester-based multifilament fiber having a single fiber fineness of 1.8 dtex and a number of 24 in the core part The mixture was mixed (blended) with a spinning machine to obtain a long and short spun yarn of English cotton count 40s as a twist coefficient of 3.5. The long and short spun yarns thus obtained were used as warp yarns and weft yarns, and an air jet loom was used to obtain a plain weave material having a yarn density of 110 yarns / 2.54 cm and a weft density of 76 yarns / 2.54 cm. The obtained plain weave fabric was a fabric excellent in water absorption, quick drying and anti-pilling properties, but was inferior in texture. The results are shown in Tables 1 and 2.

Comparative Example 4
Flat multi-lobal cross-section polyester staple fiber having a single fiber fineness of 1.7 dtex, a fiber length of 51 mm, a flatness of 2.2, an irregular degree of 1.8, and a convexity ratio of 0.8, 70% by mass of fibers with 8 convex sections in cross-sectional shape and 30% by mass of polyester short fibers with a single fiber fineness of 1.8 dtex and a fiber length of 51 mm are mixed in a cotton batting step, A blended yarn of 40 s cotton type was obtained. The blended yarn thus obtained was used for warp and weft, and an air jet loom was used to obtain a plain weave having a warp density of 110 / 2.54 cm and a weft density of 76 / 2.54 cm. The obtained plain weave fabric was a fabric excellent in water absorption, quick drying and anti-pilling properties, but was inferior in texture. The results are shown in Tables 1 and 2.

A: The maximum length of the cross section of the flat multi-lobal polyester short fiber B: The maximum width C of the flat multi-lobal polyester short fiber cross section: The length D of the line connecting the apexes of adjacent convex portions in the maximum uneven portion: The length of the perpendicular drawn to the base of the recess from the line connecting the apexes of adjacent protrusions in the largest uneven portion

Claims (3)

A long and short composite spun yarn comprising 60 to 80% by mass of flat multi-lobal cross section polyester-based short fibers on the sheath side and 20 to 40% by mass of polyester-based multifilament fibers on the core side The multi-lobal cross section polyester-based short fiber has the maximum length A of the cross section as the axis of symmetry, and the longest length excluding the cross section maximum width B among the opposing biconvex peak line segments is E. When it does, the convex part (E / B) shown by following Formula (1) satisfy | fills the range of 0.6-0.9, Long and short composite spun yarn characterized by the above-mentioned.
· Convex part ratio (E / B) (1) The single fiber fineness of the flat multi-leaf cross-section polyester-based short fiber disposed on the sheath side is in the range of 1.5 to 4.0 dtex, and the cross-sectional shape is a flat shape having six or more convex portions on the circumference, The flatness (A / B) represented by the following formula (2) is 2.0 to 3.0, and the deformation degree (C / D) represented by the following formula (3) is 1.0 to 5.0, And that the single fiber fineness of the polyester multifilament fiber disposed on the core side is in the range of 1.5 to 4.0 dtex and has a large fineness of 1.03 to 3.0 times the sheath single fiber fineness The long and short composite yarn according to claim 1, characterized in that
Flatness (A / B) (2)
・ Deformation degree (C / D) ... (3)
(Where A is the maximum length of the cross section of the flat multi-lobal polyester short fiber, B is the maximum width of the cross section of the flat multi-lobal polyester short fiber, and C is a line connecting the apexes of adjacent convex portions in the maximum uneven portion. The length of D, and the length D of the maximum uneven portion respectively represent the length of a perpendicular drawn from the line connecting the apexes of adjacent convex portions to the bottom of the concave portion.)   A fabric comprising the composite spun yarn according to claim 1 or 2.