JP2019127661A - Multifilament yarn, woven knitted product thereof, and shoe material including woven knitted product - Google Patents

Abstract

To provide a multifilament yarn having satisfactory spinning operability or the like, and having excellent lightness, coolness, ultraviolet preventability and sheer preventability upon wet, a woven knitted product, and a shoe material.SOLUTION: A multifilament yarn comprises: a synthetic resin part 2 in which the content X (mass%) of inorganic oxide fine particles satisfies 2<≤10; and a synthetic resin part 3 in which the content Y (mass%) of inorganic oxide fine particles satisfies 2 mass% or lower. It is preferable that the cross-sectional shape to the longitudinal direction of a single yarn 1 composing the multifilament yarn in which the content X (mass%) of the inorganic oxide fine particles satisfies 2<X≤10 be a multileaf shape including 6 to 30 leaf parts 4 radially going from the central side of the single yarn to the outer peripheral side, and the tip part on the outer peripheral side of each leaf part have a curve shape.SELECTED DRAWING: Figure 1

Description

  The present invention is a multifilament yarn which is excellent in spinnability, processability in spinning and weaving and knitting processes, and which is excellent in coolness, ultraviolet ray blocking ability, and wet permeation preventing ability when wet and knitted. And woven and knitted fabrics thereof, and shoe materials.

  Conventionally, a filament made of a synthetic resin containing inorganic oxide fine particles such as titanium oxide is known as a fiber that imparts coolness and anti-slipping properties to a woven or knitted fabric. The woven or knitted fabric using the filament can enhance the sunlight shielding property, and a certain effect is obtained in the cool feeling and the see-through preventing property.

  However, when the inorganic oxide fine particles are contained at a high concentration, the inorganic oxide fine particles are exposed on the surface of the filament, and the exposed inorganic oxide fine particles cause the guide wear in the yarn making and weaving process, etc. Process passability problems arise. In order not to cause the problem of processability, it is possible to contain inorganic oxide fine particles only at most about 2% by mass, and the obtained woven or knitted fabric is sufficiently effective in the cooling sensitivity and the transparency preventing property. That wasn't true.

  FIG. 2 is a schematic diagram illustrating an example of a cross-sectional shape with respect to the longitudinal direction of the conjugate fiber according to the related art. As shown in FIG. 2 (a), it comprises a portion 7 containing a high concentration of inorganic oxide fine particles and a portion 8 not containing inorganic oxide fine particles, the portion 7 being a core portion and the portion 8 being a sheath portion. In addition, composite fibers 6 arranged concentrically are known. According to the composite fiber 6, the cool sensitivity and the light transmission preventing effect when made into a woven or knitted fabric are enhanced to some extent without the problem of processability.

  Further, as shown in FIG. 2B, the composite fiber is composed of a synthetic resin portion 10 having a content of inorganic oxide fine particles of 5 to 30% by mass and a synthetic resin portion 11 not containing inorganic oxide fine particles. The composite fiber 9 in which the synthetic resin part 11 is divided into three or more layers by the synthetic resin part 10 and the synthetic resin part 11 occupies 50% or more of the surface of the composite fiber is known (for example, Patent Document 1) reference.). According to the composite fiber 9, since the region through which sunlight is transmitted is reduced, it is possible to expect an effect of preventing coolness and transparency.

JP-A-5-247723

  However, since the composite fiber 6 shown in FIG. 2 (a) has a concentric composite shape, the portion 8 that does not contain the inorganic oxide fine particles has many areas through which sunlight passes, and a sufficient effect is also obtained. I could not say that. Further, the composite fiber 9 shown in FIG. 2 (b) was limited to a certain degree in the cooling sensitivity and the see-through preventing effect. Therefore, in order to increase the sunlight shielding effect of the composite fiber 9, it is necessary to increase the proportion of the synthetic resin portion 10, but the area of the synthetic resin portion 10 exposed on the surface of the composite fiber 9 also increases accordingly. Therefore, the exposed inorganic oxide fine particles are increased, and there is a problem that the process passability problem such as guide wear occurs.

  Furthermore, the composite fiber 9 shown in FIG. 2 (b) is insufficient in the ability to prevent moisture permeation when wet, when it is made into a woven or knitted fabric, and when used in sports applications or shirt applications in summer, etc. There was also a problem that changed significantly. Furthermore, since the conjugate fiber shown in FIGS. 2 (a) and 2 (b) does not have a hollow portion, it may be inferior in lightness.

  The present invention solves the above problems and has good processability in spinning operation, spinning process and weaving / knitting process, and when it is made into a woven or knitted fabric, it has a cool sensitivity, an ultraviolet ray blocking property, and a transparent when wet. An object of the present invention is to provide a multifilament yarn excellent in preventability and a woven or knitted fabric made of the multifilament yarn.

The present inventors made the composite fiber shown in FIG. 2 (b) incident on the synthetic resin portion 10 because the cross-sectional shape of the synthetic resin portion 10 containing inorganic oxide fine particles at a high concentration is linear. It has been found that the reflection of sunlight becomes simple, diffuse reflection does not occur sufficiently, and the ability to prevent moisture penetration is insufficient. Furthermore, the inventors have found that the cross-sectional shape of the fiber has a specific cross-sectional shape such as having a certain hollow portion, thereby improving the anti-slipping performance when wet for the first time, and reached the present invention.
That is, the gist of the present invention is the following (1) to (13).

(1) Synthetic resin part in which the content ratio X (mass%) of inorganic oxide fine particles is 2 <X ≦ 10, and synthetic resin part in which the content ratio Y (mass%) of inorganic oxide fine particles is 2 mass% or less A multifilament yarn comprising
A multifilamentary yarn characterized in that the cross-sectional shape with respect to the longitudinal direction of the single yarn constituting the multifilamentary yarn satisfies the following (i) to (iv).
(I) The shape of the synthetic resin portion in which the content ratio X (mass%) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is 6 to 30 radially directed from the center side to the outer circumference side of the single yarn. Multi-leaf shape including individual leaves.
(Ii) The tip on the outer peripheral side of the leaf is curved.
(Iii) The exposed length (μm) of the synthetic resin portion having a content ratio X (mass%) of the inorganic oxide fine particles to 2 <X ≦ 10 with respect to the outer peripheral length (μm) of the single yarn The ratio is 10% or less.
(Iv) The average ratio of the shortest distance (μm) from the outer periphery of the single yarn to the leaf part to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn is 10% or less.
(V) The hollow rate of the single yarn is 5 to 30%.
(Vi) Each of the leaves is separated from each other all around, and the shortest distance measured and calculated by the following method of the leaves adjacent to each other is 0.1 to 2.0 μm.
(Method)
Take out the single yarn from the multifilament, observe the cross section of the single yarn taken out in the longitudinal direction with an optical microscope (PCSCOPE PCS-81X made by INABATA & CO), and the shortest distance (μm) between the adjacent leaf portions in the separated leaf portion ) Is measured for all the separated leaf portions in the cross section, and the average value is defined as the shortest distance (μm) between the leaf portions adjacent to each other.
(2) A synthetic resin portion in which the content X of inorganic oxide fine particles X (mass%) is 2 <X ≦ 10, and a synthetic resin in which the content Y of the inorganic oxide fine particles Y (mass%) is 2 mass% or less A multifilament yarn comprising
A multifilamentary yarn characterized in that the cross-sectional shape of the single yarn constituting the multifilamentary yarn with respect to the longitudinal direction satisfies the following (i) to (vii).
(I) The shape of the synthetic resin portion in which the content ratio X (mass%) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is 6 to 30 radially directed from the center side to the outer circumference side of the single yarn. Multi-leaf shape including individual leaves.
(Ii) The tip on the outer peripheral side of the leaf is curved.
(Iii) The exposed length (μm) of the synthetic resin portion having a content ratio X (mass%) of the inorganic oxide fine particles to 2 <X ≦ 10 with respect to the outer peripheral length (μm) of the single yarn The ratio is 10% or less.
(Iv) The average ratio of the shortest distance (μm) from the outer periphery of the single yarn to the leaf part to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn is 10% or less.
(V) The hollow rate of the single yarn is 5 to 30%.
(Vi) The hollow portion is disposed in the synthetic resin portion having a content Y (mass%) of the inorganic oxide fine particles of 2% by mass or less at the central portion of the single yarn, and the leaf portion is the hollow portion It is arranged so as to surround.
(Vii) Each of the leaves is separated from each other all around, and the shortest distance measured and calculated according to the following method of the adjacent leaves is 0.1 to 2.0 μm.
(Method)
Take out the single yarn from the multifilament, observe the cross section of the single yarn taken out in the longitudinal direction with an optical microscope (PCSCOPE PCS-81X made by INABATA & CO), and the shortest distance (μm) between the adjacent leaf portions in the separated leaf portion ) Is measured for all the separated leaf portions in the cross section, and the average value is defined as the shortest distance (μm) between the leaf portions adjacent to each other.
(3) Synthetic resin part in which the content ratio X (mass%) of inorganic oxide fine particles is 2 <X ≦ 10, and synthetic resin part in which the content ratio Y (mass%) of inorganic oxide fine particles is 2 mass% or less A multifilament yarn comprising
A multifilamentary yarn characterized in that the cross-sectional shape of the single yarn constituting the multifilamentary yarn with respect to the longitudinal direction satisfies the following (i) to (vii).
(I) The shape of the synthetic resin portion in which the content ratio X (mass%) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is 6 to 30 radially directed from the center side to the outer circumference side of the single yarn. Multi-leaf shape including individual leaves.
(Ii) The tip on the outer peripheral side of the leaf is curved.
(Iii) The exposed length (μm) of the synthetic resin portion having a content ratio X (mass%) of the inorganic oxide fine particles to 2 <X ≦ 10 with respect to the outer peripheral length (μm) of the single yarn Less than 10%.
(Iv) The average ratio of the shortest distance (μm) from the outer periphery of the single yarn to the leaf part to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn is 10% or less.
(V) The hollow rate of the single yarn is 5 to 30%.
(Vi) The outer peripheral shape of the single yarn is circular.
(Vii) Each of the leaves is separated from each other all around, and the shortest distance measured and calculated according to the following method of the adjacent leaves is 0.1 to 2.0 μm.
(Method)
The single yarn is taken out of the multifilament, and the transverse cross section of the taken out single yarn in the longitudinal direction is observed with an optical microscope (INASBA & CO PCSCOPE PCS-81X made by INA), and the shortest distance (μm) between adjacent leaves in separated leaves ) Is measured for all the separated leaf portions in the cross section, and the average value is defined as the shortest distance (μm) between the leaf portions adjacent to each other.
(4) The shape of the synthetic resin portion in which the content X (mass%) of the inorganic oxide fine particles in the transverse cross section is 2 <X ≦ 10 is 20 to 30 radially from the center side to the outer peripheral side of the single yarn. The multifilament yarn according to any one of (1) to (3), which has a multi-leaf shape including individual leaf parts.
(5) The content rate Y (% by mass) of the synthetic resin constituting the synthetic resin portion in which the content rate X (% by mass) of the inorganic oxide fine particles is 2 <X ≦ 10 and the content ratio Y (% by mass) of the inorganic oxide fine particles The multifilament yarn according to any one of (1) to (4), wherein the synthetic resin constituting the synthetic resin portion is polyester.
(6) Synthetic resin portion where the content X (mass%) of the inorganic oxide fine particles is 2 <X ≦ 10 and the synthetic resin where the content Y (mass%) of the inorganic oxide fine particles is 2 mass% or less The multifilament yarn according to any one of (1) to (5), wherein the mass ratio to the part is 30/70 to 90/10.
(7) A woven or knitted fabric comprising the multifilament yarn of any one of (1) to (6).
(8) The woven fabric according to (7) having a cover factor (CF) of 1000 to 3500.
(9) The knitted fabric according to (7) having a cover factor (CF) of 500 to 2500.
(10) The knitted or knitted fabric according to any one of (7) to (9), wherein the cooling property (CT) is 2.0 or more.
(11) The woven or knitted fabric according to any one of (7) to (10), wherein the ultraviolet ray prevention index (UPF) is 30 or more.
(12) The woven or knitted fabric according to any one of (7) to (11), wherein a permeability reduction degree (TF) represented by the following formula (I) is 8.0% or less.

(13) A shoe material comprising the woven or knitted fabric according to any one of (7) to (12).

  According to the multifilament yarn of the present invention, the spinnability, the process passability in the spinning process and the weaving and knitting process are good, and when made into a woven or knitted fabric, the cooling sensitivity, the ultraviolet ray blocking property and the permeation of light when wet are prevented. Excellent in properties. Further, according to the woven or knitted fabric of the present invention, since it is in a composite form, even if the content of the inorganic oxide fine particles is sufficiently reduced, it is excellent in coolness, anti-ultraviolet properties, and anti-through-through properties when wet. . Therefore, since the apparel made of the woven or knitted fabric can greatly reduce the feeling of sheer change before and after sweating, it can be preferably used for sports use or summer shirt use. Furthermore, according to the multifilament yarn of the present invention, since it is excellent in lightness because it has a hollow portion, it can be preferably used for shoe material applications.

It is a schematic diagram which illustrates embodiment of the cross-sectional shape with respect to the longitudinal direction of the single yarn which comprises the multifilament yarn of this invention. It is a schematic diagram which shows an example of the cross-sectional shape with respect to the longitudinal direction of the composite fiber which concerns on a prior art example. It is a schematic diagram which shows an example of the cross-sectional shape with respect to the longitudinal direction of the single yarn which comprises the multifilament yarn which concerns on a comparative example. It is a plane schematic diagram which shows the principal part of the apparatus which measures the cooling property (CT) of the woven / knitted fabric of this invention. It is an AA cross-sectional schematic diagram which shows the principal part of the apparatus which measures the cooling property (CT) of the woven / knitted fabric of this invention. It is a BB cross-sectional schematic diagram which shows the principal part of the apparatus which measures the cooling property (CT) of the woven / knitted fabric of this invention.

  Hereinafter, the present invention will be described in detail.

  The multifilament yarn of the present invention comprises a synthetic resin portion (hereinafter, may be abbreviated as segment A) in which the content X (mass%) of inorganic oxide fine particles is 2 <X ≦ 10, and inorganic oxide fine particles. The synthetic resin part (hereinafter, may be abbreviated as segment B) having a content Y (mass%) of 2 mass% or less. Segment A is not exposed on the surface of the single yarn. This is excellent in spinning operability and process passability.

  In the present invention, the synthetic resin constituting the segment A and the segment B is not particularly limited as long as it can be melt-spun. Specifically, polyesters typified by polyalkylene terephthalates such as polyethylene terephthalate (PET), polybutylene terephthalate, polytrimethylene terephthalate, nylon 6, nylon 66, nylon 46, nylon 11 and polyamide 12 typified by nylon 12, Polyolefins represented by polypropylene and polyethylene, polychlorinated polymers represented by polyvinyl chloride and polyvinylidene chloride, polytetrafluoroethylene and copolymers thereof, fluorinated polymers represented by polyvinylidene fluoride and the like, PLA (poly (poly) Examples include biomass polymers obtained by chemically polymerizing biomass-derived monomers such as lactic acid, PTT (polytrimethylene terephthalate), and PBS (polybutylene succinate). From the viewpoint of spinning operability, processability and the like, polyester and polyamide are preferable.

  In the present invention, it is preferable that the synthetic resin constituting the segment A and the synthetic resin constituting the segment B be a combination having excellent compatibility. For example, in the case where both the synthetic resin forming the segment A and the synthetic resin forming the segment B are polyesters, the compatibility tends to be excellent. By combining the synthetic resin constituting the segment A and the synthetic resin constituting the segment B with excellent compatibility, the physical impact and thermal impact that the segment A and the segment B receive in the yarn making process, the weaving and knitting process, etc. It becomes difficult to peel off by impact. As described above, when both the synthetic resin that constitutes segment A and the synthetic resin that constitutes segment B are made of polyester, if both resins are made of PET, the resulting multifilament yarn prevents peeling of segment A and segment B In addition to the above, it is more preferable because the thermal stability is excellent.

  Among the above synthetic resins, for example, polyester, aromatic dicarboxylic acids such as isophthalic acid and 5-sulfoisophthalic acid, adipic acid, succinic acid, suberic acid and sebacic acid, taking melt viscosity, thermal characteristics and compatibility into consideration. Aliphatic dicarboxylic acids such as dodecanedioic acid, and aliphatic diols such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxy Caproic acid, hydroxypentanoic acid, hydroxyheptanoic acid, hydroxycarboxylic acid such as hydroxyoctanoic acid, and aliphatic lactone such as ε-caprolactone may be copolymerized.

  In the present invention, inorganic oxide fine particles having a high solar light shielding effect are preferable, and examples thereof include fine particles of titanium oxide, calcium oxide, magnesium oxide, zinc oxide and the like. Among these, titanium oxide fine particles are preferable.

  In the present invention, the segment A needs to have an inorganic oxide fine particle content X (mass%) of 2 <X ≦ 10, preferably 3 ≦ X ≦ 8, and more preferably 5 ≦ X ≦ 8. . By setting the content ratio X to 2 <X ≦ 10, the spinning operability becomes good, and by setting it to a specific cross-sectional shape to be described later, when the multifilament yarn of the present invention is made into a woven and knitted fabric It is excellent in the resistance, the ultraviolet ray-preventing property, and the moisture-preventing property.

  On the other hand, the segment B needs to have a content Y (mass%) of the inorganic oxide fine particles of 2 mass% or less, from the viewpoint of coexistence of spinning operability and the see-through preventing effect as a woven or knitted fabric, 0 <Y ≦ 1 is preferable, and 0 <Y ≦ 0.5 is more preferable. By setting it as this content, the multifilament yarn of the present invention becomes good in the processability in the spinning operation, the spinning process and the weaving and knitting process.

  In addition to the inorganic oxide fine particles, the synthetic resin constituting the segment A and the synthetic resin constituting the segment B include a stabilizer such as an antioxidant, a fluorescent agent, a pigment, an antibacterial agent, a deodorant, a matte. An agent, a strengthening agent, etc. may be added in the range which does not impair the effect.

  The shape of the segment A in the cross section to the longitudinal direction of the single yarn constituting the multifilament yarn is a multi-leaf shape including 6 to 30 leaves extending radially from the center side to the outer peripheral side of the single yarn Necessary, a multi-leaf shape including 8 to 30 leaf portions is preferable, and a multi-leaf shape including 20 to 30 leaf portions is more preferable.

  Here, the leaf portion in the present invention is a substantially rectangular shape or a substantially elliptical shape (the elliptical shape has a major axis and a minor axis so that the major axis is directed from the center side to the outer peripheral side of the single yarn. (Elliptical shape), substantially trapezoidal shape (the trapezoidal shape is a trapezoidal shape in which one base is longer than the other base, and the longer base is disposed on the outer peripheral side of the single yarn, the shorter 1 is a trapezoidal shape that is arranged so that the bottom is on the center side of the single yarn, and at least one corner is a curve. Specifically, for example, a multifilament yarn shown in FIG. This is exemplified by the cross-sectional shape with respect to the longitudinal direction of the single yarn (hereinafter sometimes abbreviated as the composite shape of the present invention). The leaf portion does not have to be smooth, for example, each side of the substantially rectangular shape, the substantially elliptical shape, and the substantially trapezoidal shape, and includes, for example, minute convex portions and / or concave portions, or wavy lines. Also good.

  In addition, as illustrated in FIGS. 1A to 1D, in the composite shape of the present invention, the segment A has leaf portions that radiate from the center side to the outer peripheral side of the single yarn 1. 4 are required to be separated around the entire circumference (for example, FIG. 1B).

  As described above, as the segment A, when the leaves are separated in the segment B, the interval between the adjacent leaves is preferably 0.1 to 2.0 μm, More preferably, it is 1.0 μm.

  The multifilament yarn of the present invention is adjacent to each other because the shape of the segment A in the cross section is a multileaf shape including 6 to 30 leaves extending radially from the center side to the outer peripheral side of the single yarn. The distance between the leaves can be small. Further, preferably, by setting the interval to be a specific one, it becomes easy to repeat that the sunlight that has entered one of the leaf portions and diffusely reflected is further diffusely reflected by the adjacent leaf portions. Combined with the effect of providing the knitted fabric, it is presumed that the anti-slipping property when wet in the case of a woven or knitted fabric will be excellent.

  In addition, it is necessary that the tip of the outer peripheral side of the leaf has a curved shape. When the tip portion has a curved shape, when it is woven or knitted, the see-through preventing effect when wet is more excellent. This is presumed to be caused by the fact that sunlight incident on the multifilament causes diffuse reflection by the tip of the leaf having a curved shape.

  The single yarn constituting the multifilament yarn of the present invention has a ratio (EC) of the exposed length (μm) of the segment A to the surface of the single yarn to the outer peripheral length (μm) of the single yarn in the composite shape of the present invention It is required to be 10% or less, preferably 5% or less.

  By setting the ratio to 10% or less, the processability in the spinning operability, the spinning process and the weaving / knitting process is improved.

  The single yarn constituting the multifilament yarn of the present invention is the shortest distance from the outer periphery of the single yarn to the leaf portion with respect to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn in each leaf portion of the composite shape The average ratio (DC) of (μm) needs to be 10% or less, and preferably 5% or less.

  When the average ratio is more than 10%, the region sandwiched between the leaf portion and the outer periphery of the single yarn in the region of segment B becomes large, and sunlight easily passes through the region. As a result, the amount of sunlight passing through the region is increased, so that the resulting multifilament is inferior in the cool sensitivity, the ultraviolet ray preventing property and the moisture preventing property in the case of a woven or knitted fabric.

  The above EC and DC can be made into the above range by appropriately adjusting the spinning conditions such as the shape of the spinning nozzle, the viscosity of the synthetic resin, and the spinning temperature.

  Furthermore, the hollow ratio of the single yarn constituting the multifilament yarn of the present invention needs to be 5 to 30%, and preferably 10 to 20%. The hollow portion is preferably disposed at the center of the single yarn from the viewpoint of spinning operability, uniform shedding prevention property, and the like. Since the multifilament yarn of the present invention has a hollow portion, it is excellent in lightness.

  In the measurement of the hollowness ratio, a cross-sectional photograph of a single yarn cross section taken at a magnification of 10 to 20 times with an optical microscope (PCSCOPE PCS-81X manufactured by INABATA & CO), the single yarn diameter in the photograph is 10 to 20 mm The diameter of the single yarn (μm), the length of the long axis of the hollow part (μm), and the length of the short axis of the hollow part (μm) are measured. And it shall calculate by following formula (II).

  The hollow ratio can be made into the above-mentioned range by appropriately adjusting the spinning conditions such as the shape of the spinning nozzle, the viscosity of the synthetic resin, and the spinning temperature.

The multifilament yarn of the present invention is provided with a cross-sectional shape having the specific hollow portion in addition to the specific multi-leaf shape in the above-described cross-section, so that a conventional concentric composite fiber, a linear split type Compared with the fiber and the composite fiber not provided with the hollow portion, the cool sensation in the case of the woven or knitted fabric, the ultraviolet ray prevention property, and the see-through prevention property when wet can be made particularly excellent. This is because the refractive index of the air layer contained in the hollow part and the refractive index of the segment A and / or the segment B are different by further providing the hollow part. This is presumably due to a synergistic effect resulting from refraction at the hollow portion.

  If the hollowness is less than 5%, the hollow portion occupying the cross section of the single yarn is small, so that the effect due to the refractive index difference between the air layer and the segment A and / or the segment B is not sufficiently exhibited. When it is made into a knitted fabric, it will be inferior in the cool sensitivity, the ultraviolet ray preventing property and the penetration preventing property when wet. In addition, if the ratio of the hollow portion exceeds 30%, it is not preferable because the hollow portion disappears due to crushing in the yarn making process or the post-processing step, and fibrillation or whitening occurs due to peeling of the hollow portion.

  In the composite shape of the present invention, the shape of the segment A is preferably rotationally symmetrical. Here, the rotationally symmetric shape refers to one that overlaps the original shape when rotated by a fixed angle around the center point of the single yarn cross section. When the shape of the segment A is rotationally symmetrical, the single yarn spun out from the spinning nozzle exhibits a so-called yarn bending phenomenon, causing a problem that stable spinnability and good yarn quality can not be obtained. It becomes difficult. In addition, the shielding property of the segment A that contributes to the prevention of see-through is less likely to be offset, and it is easy to obtain the uniform prevention of see-through for all angles.

  The single yarn constituting the multifilament yarn of the present invention preferably has a mass ratio of the segment A to the segment B (segment A / segment B) of 30/70 to 90/10, and 60/40 to 80 More preferably, it is / 20.

  When the mass ratio is 30/70 or more, the multifilament yarn of the present invention is particularly excellent in the coolness, the ultraviolet ray preventing property and the moisture preventing property when it is made into a woven or knitted fabric. When the mass ratio is 90/10 or less, the processability in the spinning operability, the spinning process, and the weaving and knitting process is easily improved. When the mass ratio is 60/40 to 80/20, the multifilament yarn of the present invention can be made into a woven or knitted fabric while maintaining good processability in spinning operation, spinning and weaving and knitting processes. It is more preferable in that it is easy to make it particularly excellent in cool sensibility, ultraviolet ray prevention property and anti-translucency property when wet.

  The multifilament yarn of the present invention preferably has a single yarn fineness of 0.5 to 10 dtex, more preferably 0.8 to 5 dtex, and still more preferably 1 to 3 dtex.

  In the present invention, the number of single filaments of the multifilament yarn is preferably large for the purpose of enhancing the diffuse reflection effect of sunlight by the multifilament yarn, preferably 10 to 200, and more preferably 20 to 100.

  The multifilament yarn of the present invention is processed to be subjected to processing such as false twisting processing, real twist processing, loop processing, interlace processing, etc. as long as the effects of the present invention are not impaired It may be a thread.

  The woven or knitted fabric of the present invention is required to include the multifilament yarn of the present invention, and is preferably included at a mixing ratio of 25% by mass or more, and more preferably included at a mixing ratio of 100% by mass. The woven or knitted fabric according to the present invention has excellent coolness and ultraviolet ray-preventing properties by being composed of the multifilament yarn of the present invention, and also has excellent light-preventing properties even when the woven or knitted fabric is wet due to perspiration etc. Can do. Furthermore, by having a hollow part, it is excellent also in lightness.

  The woven or knitted fabric of the present invention preferably has a cooling property (CT) of 2.0 or more, more preferably 2.5 or more, and still more preferably 3.0 or more. The higher the value of CT, the better the coolness of the woven or knitted fabric.

  FIG. 4 is a schematic plan view showing the main part of an apparatus for measuring the cooling property (CT) of the woven or knitted fabric of the present invention, FIG. 5 is a schematic cross-sectional view along AA, and FIG. 6 is a schematic cross-sectional view along BB. It is. As shown in FIGS. 4 and 5, in the measurement of CT, holes 13a and 13b of 8 cm long, 8 cm wide and 0.7 cm deep are provided on the upper surface side of the 20 cm high expanded polystyrene foam 12, and the holes 13a and 13 b are provided. An apparatus provided with thermocouples 15a and 15b at the center of the bottom is used. The woven or knitted fabric to be measured is cut into a square having a side length of 10 cm, and the cut or knitted woven or knitted fabric 14a is attached to the upper surface of the foam polystyrene 12 so as to cover one hole 13a. As a woven or knitted fabric to be used as a blank, it is composed of a PET multifilament consisting of a single component having the same single yarn fineness and the same number of filaments as the multifilament constituting the woven or knitted fabric to be measured and containing 0.4% by mass of titanium oxide fine particles Using the woven or knitted fabric 14b having the same structure as the woven or knitted fabric to be measured, it is pasted so as to cover the other hole 13b in the same manner as the woven or knitted fabric 14a to be measured. Then, as shown in FIG. 6, the thermocouple 15a is installed in the hole 13a to which the woven / knitted fabric 14a to be measured is attached after 15 minutes, with the surface of the woven / knitted fabric attached to the device facing horizontally. The temperature (T1 (° C)) and the temperature (T2 (° C)) of the thermocouple 15b provided in the hole 13b to which the woven or knitted fabric 14b serving as a blank is attached are measured, and the difference between the respective temperatures (T2-T1 (° C) ) As CT. The measurement is performed under the condition that the illuminance on the surface of the woven or knitted fabric 14a to be measured and the woven or knitted fabric 14b to be blank is 95000 lux to 105000 lux.

  In the woven or knitted fabric of the present invention, in order to increase CT, in addition to enhancing the sunlight shielding properties of the multifilament yarn of the present invention itself, the mixing ratio of the multifilament yarn, the cover factor of the woven or knitted fabric described later It becomes easy by making it.

  The woven or knitted fabric of the present invention preferably has an ultraviolet prevention index (UPF) of 30 or more. Here, the UV protection index (UPF) refers to the UV transmittance of 280 to 400 nm measured using a spectrophotometer in accordance with the Australian New Zealand Standard (AS / NZS; 4399: 1996), taking into account a predetermined damage coefficient, Is to be calculated.

  The higher the value of UPF, the larger the ultraviolet shielding performance, and the value of UPF is 30 or more, which is a grade of "Very good protection" or more, and is preferable because it has the effect of protecting the skin from ultraviolet light and preventing damage. In order to make the UPF of the woven or knitted fabric of the present invention high, in addition to enhancing the sunlight shielding property of the multifilament itself, it becomes easier by, for example, making the mixing ratio and cover factor described later appropriate. .

  The woven or knitted fabric of the present invention preferably has a degree of reduction in the degree of permeation (TF (%)) represented by the following formula (I) of 8.0% or less, more preferably 7.0% or less, and 6. 0% or less is more preferable.

  In the above formula (I), WId and WIw are numerical values obtained by measuring the tabe whiteness using a Macbeth MS-2020 spectrophotometer. In addition, the sample at the time of drying is a sample in which the woven and knitted fabric is adjusted by 24 Hrs under the environment of 20 ° C. and 65% RH, and the sample at the time of wetting is the sample obtained by adjusting 24 Hrs in the environment of 20 ° C. and 65% RH. A sample containing the same amount of water as the sample.

  In order to lower the TF (%) of the woven or knitted fabric of the present invention, the multifilament yarn of the present invention itself is to be improved in the ability to prevent wet-off when the multifilament yarn is woven or knitted. In addition to the above, for example, this can be achieved by making the mixture ratio and the cover factor described later appropriate.

  In the woven or knitted fabric of the present invention, the mixed rate of the multifilament yarn of the present invention is preferably 25% by mass or more, more preferably 30% by mass or more, and further preferably 40% by mass. The woven and knitted fabric according to the present invention preferably has a mixing ratio of 100% by mass in order to sufficiently shield sunlight, but if it is 25% by mass or more, it has cool sensitivity, UV protection, and permeation prevention when wet. It will be easy enough. Blending methods include blending, twisting, knitting and the like.

  When the woven or knitted fabric of the present invention is a woven fabric, the cover factor (CF) is preferably in the range of 1000 to 3500, and particularly preferably 1500 to 2500 in the case of woven fabric. When the woven or knitted fabric of the present invention is a knitted fabric, the CF is preferably in the range of 500 to 2,500, and particularly preferably 800 to 1,800. Here, the cover factor (CF) is calculated by the following formula (III) in the case of a woven fabric, and is calculated by the following formula (IV) in the case of a knitted fabric.

DT: Fineness of multifilament (dtex) WAD: Warp density (line / 2.54 cm)
WED: Weft density (book / 2.54 cm)
CD: Course density (book / 2.54cm)
WD: Wale density (book / 2.54 cm)

  In addition, the fineness of the multifilament is JIS L 1096: 2010 8.9.9.1. Method A of a, in the case of knitting JIS L 1096: 2010 8.9.9. Measure and calculate according to b. The warp density and the weft density are measured and calculated according to the JIS L 1096: 2010 8.6.1A method, and the course density and the wale density are measured according to JIS L 1096: 2010 8.6.2.

  When the woven or knitted fabric of the present invention satisfies the above-mentioned cover factor, the woven or knitted fabric is particularly excellent in coolness, ultraviolet ray prevention and anti-transparency when wet.

  When the woven or knitted fabric of the present invention is a knitted fabric, the knitting density is not particularly limited, but is preferably 15 to 80 course / inch and 15 to 50 wal / inch, and preferably 20 to 50 course / inch and 20 More preferred is ~ 35 wal / inch.

  In the woven or knitted fabric of the present invention, the woven fabric and knitted fabric are not particularly limited, and examples of the woven fabric include three primary structures such as plain weave, twill weave and satin weave and their change textures, warp double weave, weft double weave Etc. can be employed. On the other hand, in the case of the knitting structure, in the case of the side knitting structure, plain knitting (tendon, kanoko knitting, fleece knitting, piling knitting (such as bear tempering), rubber knitting (smooth knitting, interlock knitting, Milanrib, single picket, double picket) (Ripple, one-piece knitting, one-piece knitting, punch rome etc.), pearl knitting etc. In the case of warp knitting, single denby knitting, single atlas knitting, single cord knitting, double denby knitting, double atlas knitting Double cord knitting, half tricot knitting, Quins cord knitting, satin knitting, fleece knitting, jacquard knitting, mock loddy knitting, etc. The number of layers of the knitted fabric may be a single layer or a multilayer of two or more layers. When the knitted or knitted fabric of the present invention is used as a shoe material, in order to obtain the necessary strength in terms of the physical properties of the knitted fabric required for the shoes, the organization in which one course is composed of a plurality of organizations is preferred. From the viewpoint tear strength force is good, Mokkurodi knitting is preferred.

  The use of the woven or knitted fabric of the present invention is not particularly limited, and, for example, clothing (shirt, inner, outer, sportswear, ladies' wear, uniform, etc.), hat, tent, curtain, umbrella, swimwear, briefcase Preferably, shoe materials are used.

  The shoe material of the present invention needs to include the woven and knitted fabric of the present invention described above. Since the shoe material of the present invention is excellent in permeation resistance, lightness, coolness and UV protection, it has a good wearing feeling.

  Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited by the following examples.

  The measurement and evaluation in the following examples and comparative examples were performed by the following methods.

(1) Intrinsic viscosity [η]
The equal mass mixture of phenol and ethane tetrachloride was used as a solvent and measured according to a conventional method at a temperature of 20 ° C.

(2) Ratio of the exposed length (μm) of the segment A on the surface of the single yarn to the outer peripheral length (μm) (EC)
The transverse cross section of the single yarn taken out from the multifilament yarn with respect to the longitudinal direction is observed with an optical microscope (PCSCOPE PCS-81X manufactured by INABATA & CO), and the single yarn outer peripheral length (μm) and the exposed length of the segment A on the single yarn surface (μm) ) And the ratio (EC (%)) to the single yarn outer circumference (μm) was calculated by the following equation.
EC = exposed length of segment A (μm) / filament outer peripheral length (μm) × 100 (%)

(3) Average ratio (DC) of the shortest distance (μm) from the outer periphery of the single yarn to the leaf to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn
The cross section of the single yarn taken out from the multifilament yarn was observed with an optical microscope (PCSCOPE PCS-81X made by INABATA & CO), the distance from the center of the single yarn to the outer periphery of the single yarn (μm), and the single yarn in each leaf part. The shortest distance (μm) from the yarn outer periphery to each leaf was measured. And the average ratio (DC (%)) of the shortest distance (μm) from the single yarn outer periphery to each leaf in each leaf to the distance (μm) from the single yarn center to the single yarn outer periphery was calculated by the following equation .
DC = Average value of shortest distance from single yarn outer circumference to each leaf (μm) / distance from single yarn center to single yarn outer circumference (μm) x 100 (%)
And it determined with the following references | standards and made more than (circle) the pass.
A: When DC is 5% or less.
○: When DC is more than 5% and less than 10%.
X: When DC exceeds 10%.

(4) Shortest distance (μm) between adjacent leaf parts
Take out the single yarn from the multifilament, observe the cross section of the single yarn taken out in the longitudinal direction with an optical microscope (PCSCOPE PCS-81X made by INABATA & CO), and the shortest distance (μm) between the adjacent leaf portions in the separated leaf portion Was measured. It measured about all the leaf parts which are isolate | separated in this cross section, and made the average value the shortest distance (micrometer) of the leaf part and leaf part which adjoin mutually.

(5) Hollow ratio It measured and computed by the above-mentioned method.

(6) Cooling property (CT)
As shown in FIGS. 4 and 5, holes 20a, 13b having a length of 8 cm, a width of 8 cm, and a depth of 0.7 cm are provided on the upper surface side of the polystyrene foam 12 having a height of 20 cm, and thermoelectric power is provided at the center of the bottom of the holes 13a, 13b. An apparatus provided with pairs 15a and 15b was used. The woven or knitted fabric to be measured was cut into a square having a side length of 10 cm, and the cut woven or knitted fabric 14a was attached to the upper surface of the polystyrene foam 12 so as to cover one hole 13a. The woven or knitted fabric used as a blank consists of a PET multifilament composed of a single component having the same single yarn fineness and the same number of filaments as the multifilament constituting the woven or knitted fabric to be measured, and containing 0.4% by mass of titanium oxide fine particles. Using the woven or knitted fabric 14b having the same structure as the woven or knitted fabric to be measured, it was pasted in the same manner as the woven or knitted fabric 14a to be measured to cover the other hole 13b. Then, as shown in FIG. 6, the apparatus is installed outdoors so that the surface on which the woven or knitted fabric is attached faces in the horizontal direction, and the thermocouple 15a provided in the hole 13a to which the woven or knitted fabric 14a to be measured is attached after 15 minutes. The temperature (T1 (° C)) and the temperature (T2 (° C)) of the thermocouple 15b provided in the hole 13b where the woven or knitted fabric 14b used as a blank is pasted are measured, and the difference between the temperatures (T2-T1 (° C)) ) Was designated as CT. The measurement was carried out under the condition that the illuminance on the surface of the woven or knitted fabric 14a to be measured and the woven or knitted fabric 14b to be blank is 100,000 lux. In the present invention, a sample having a CT of 2.0 or more was accepted.

(7) UV protection index (UPF)
According to the Australian New Zealand standard (AS / NZS; 4399: 1996), it was calculated taking into account a predetermined damage coefficient in the ultraviolet transmittance of 280 to 400 nm measured using a spectrophotometer. In the present invention, a product having a UPF of 30 or more was regarded as acceptable.

(8) Permeability reduction degree (TF)
Using a Macbeth MS-2020 spectrophotometer, the sample whiteness (WId) of the dried sample and the sample whiteness (WIw) of the wet sample were measured and calculated according to the following formula (I). The dry sample is a sample obtained by adjusting a woven or knitted fabric at 24 ° C. in an environment of 20 ° C. and 65% RH, and the wet sample is a sample prepared by adjusting a woven or knitted fabric at 24 ° C. in an environment of 20 ° C. and 65% RH. Mass water was included.

In the present invention, a sample having a TF of 8.0 or less was accepted.

(9) Cover factor The cover factor of the knitted fabric was calculated by the following formula (IV).

DT: Multifilament fineness (dtex)
CD: Course density (book / 2.54cm)
WD: Wale density (book / 2.54cm)
In addition, the fineness of the multifilament is JIS L 1096: 2010 8.9.9.1. Measured and calculated according to b. The course density and the wale density were measured and calculated in accordance with JIS L 1096: 2010 8.6.2.

(10) Spinning Operability Spinning was carried out continuously for 24 hours, and evaluation was made in the following three stages based on the number of cut threads (per one weight) during operation, and O was regarded as passing.
○: 0 to 1 time Δ: 2 to 3 times ×: 4 or more

(11) Process passability Before knitting, 10 knitting needles of the knitting machine that are not scratched or worn are selected at random, and the knitting needles selected after knitting are observed using an optical microscope. I made an evaluation.
○: Scratches on all 10 knitting needles, wear not observed ×: Scratches on one or more knitting needles, wear recognized

Example 1
A synthetic resin forming segment A was made into a chip of PET having an intrinsic viscosity of 0.65 according to a conventional method and dried, and titanium oxide fine particles (TiO ₂ ) were contained in an amount of 3% by mass as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4 mass% of titanium oxide fine particles (TiO ₂ ) was contained.

  The mass ratio of the segment A to the segment B (segment A / segment B) is 75/25 using PET constituting the segment A and segment B, and the cross-sectional shape (leaf portion) of FIG. The multifilaments were spun at a spinning temperature of 295 ° C. using a conventional composite spinning apparatus with a nozzle of 20 in number. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. 48 multifilament yarns were obtained. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and the hollow part were measured and calculated using this multifilament. As a result, EC was 0% (the segment A was not confirmed to be exposed on the surface of the single yarn), DC was evaluated as ◎ (DC is 5% or less in all leaf portions), and the leaf portions adjacent to each other The shortest distance to the leaf was 0.7 μm, and the hollow percentage was 15%.

Using only the obtained multifilament yarn, after obtaining 49 wales / 2.54 cm, 53 courses / 2.54 cm as a smooth texture with a circular knitting machine, it is scoured by a usual method, and the following formulation Staining was carried out at a temperature of 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary Nikka Sun Salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric.

(Examples 2 and 3)
A multifilament yarn and a knitted fabric were obtained in the same manner as in Example 1 except that the content of titanium oxide fine particles in the PET constituting the segment A was as shown in Table 1.

(Example 4)
Multifilament yarns and knits were obtained in the same manner as in Example 1 except that the content of titanium oxide fine particles in PET constituting segment A and segment B was as shown in Table 1, respectively.

(Example 5)
As a synthetic resin constituting the segment A, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 5 mass% of titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET having an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4% by mass of titanium oxide fine particles (TiO ₂ ) were contained.

  Using the PET constituting the segment A and the segment B, the mass ratio of the segment A and the segment B (segment A / segment B) is 75/25, and the cross-sectional shape (the leaf portion) of FIG. The multifilaments were spun at a spinning temperature of 295 ° C. using a conventional composite spinning apparatus with a nozzle of 8 in number. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. 48 multifilament yarns were obtained. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and a hollow part were measured and calculated using this multifilament yarn. As a result, EC was 0% (the segment A was not confirmed to be exposed on the surface of the single yarn), DC was evaluated as ◎ (DC is 5% or less in all leaf portions), and the leaf portions adjacent to each other The shortest distance to the leaf was 0.7 μm, and the hollow percentage was 15%.

Using only the obtained multifilament, after obtaining 49 wales / 2.54 cm, 53 courses / 2.54 cm as a smooth texture with a circular knitting machine, it is scoured by a conventional method and temperature is determined by the following formulation Dyeing was performed at 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary agent Nikka sun salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric.

(Example 6)
A synthetic resin forming segment A was made into a chip of PET having an intrinsic viscosity of 0.65 according to a conventional method and dried, and titanium oxide fine particles (TiO ₂ ) were contained in an amount of 3% by mass as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET having an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4% by mass of titanium oxide fine particles (TiO ₂ ) were contained.

  Using the PET constituting the segment A and the segment B, the mass ratio between the segment A and the segment B (segment A / segment B) is 75/25, and the cross-sectional shape (the leaf portion) of FIG. The multifilaments were spun at a spinning temperature of 295 ° C. using a conventional composite spinning apparatus with a nozzle having a number of 20 and a hollow ratio of 23%. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. 48 multifilaments were obtained. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and the hollow part were measured and calculated using this multifilament. As a result, EC was 0% (the segment A was not confirmed to be exposed on the surface of the single yarn), DC was evaluated as ◎ (DC is 5% or less in all leaf portions), and the leaf portions adjacent to each other The shortest distance to the leaf was 0.5 μm, and the hollow percentage was 23%.

Using only the obtained multifilament, after obtaining 49 wales / 2.54 cm, 53 courses / 2.54 cm as a smooth texture with a circular knitting machine, it is scoured by a conventional method and temperature is determined by the following formulation Dyeing was performed at 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary Nikka Sun Salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric.

(Example 7)
A synthetic resin forming segment A was made into a chip of PET having an intrinsic viscosity of 0.65 according to a conventional method and dried, and titanium oxide fine particles (TiO ₂ ) were contained in an amount of 3% by mass as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4 mass% of titanium oxide fine particles (TiO ₂ ) was contained.

  Using the PET constituting the segment A and the segment B, the mass ratio between the segment A and the segment B (segment A / segment B) is 75/25, and the cross-sectional shape (the leaf portion) of FIG. (Multiple: 20), and a multifilament was spun at a spinning temperature of 295 ° C. using a conventional compound spinning device using a nozzle having a hollow portion ratio of 8%. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. A multifilament having 48 yarns was obtained. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and the hollow part were measured and calculated using this multifilament. As a result, EC was 0% (the segment A was not confirmed to be exposed on the surface of the single yarn), DC was evaluated as ◎ (DC is 5% or less in all leaf portions), and the leaf portions adjacent to each other The shortest distance to the leaf was 0.3 μm, and the hollow ratio was 8%.

Using only the obtained multifilament, a knitted fabric of 49 wales / 2.54 cm and 53 courses / 2.54 cm was obtained as a smooth structure with a circular knitting machine, and then scoured by a conventional method, and the temperature was determined according to the following prescription. Dyeing was performed at 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary agent Nikka sun salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric.

(Example 8)
As a synthetic resin constituting the segment A, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 5 mass% of titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4 mass% of titanium oxide fine particles (TiO ₂ ) was contained.

  Using the PET constituting the segment A and the segment B, the mass ratio between the segment A and the segment B (segment A / segment B) is 75/25, and the cross-sectional shape (the leaf portion) of FIG. Number: 20), and a multifilament was spun at a spinning temperature of 295 ° C. using a conventional compound spinning device using a nozzle with an EC of 5%. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and a hollow part were measured and calculated using this multifilament yarn. As a result, EC is 5%, DC judgment is ◎ (DC is 5% or less in all leaves), shortest distance between adjacent leaves is 0.7 μm, hollow ratio is 15% It was.

Using only the obtained multifilament, after obtaining 49 wales / 2.54 cm, 53 courses / 2.54 cm as a smooth texture with a circular knitting machine, it is scoured by a conventional method and temperature is determined by the following formulation Dyeing was performed at 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary Nikka Sun Salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric.

(Example 9)
As a synthetic resin constituting the segment A, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 5 mass% of titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4 mass% of titanium oxide fine particles (TiO ₂ ) was contained.

  Using the PET constituting the segment A and the segment B, the mass ratio between the segment A and the segment B (segment A / segment B) is 75/25, and the cross-sectional shape (the leaf portion) of FIG. No .: 20), and using a conventional compound spinning apparatus, a spinning temperature using a nozzle with a DC determination of ◯ (DC is over 5% in all leaves and 10% or less) The multifilament was spun at 295 ° C. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. 48 multifilament yarns were obtained. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and the hollow part were measured and calculated using this multifilament. As a result, the EC was 0% (the segment A was not confirmed to be exposed on the surface of the single yarn), and the DC judgment was ○ (DC exceeded 5% in all leaves and 10% or less) The shortest distance between the adjacent leaf and leaf was 0.7 μm, and the hollow ratio was 15%.

Using only the obtained multifilament yarn, after obtaining a knitted fabric of 49 wales / 2.54 cm and 53 courses / 2.54 cm as a smooth structure with a circular knitting machine, scouring by a conventional method and using the following prescription Dyeing was performed at a temperature of 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary agent Nikka sun salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric.

(Comparative example 1)
A multifilament yarn and a knitted fabric were obtained in the same manner as in Example 1 except that the content of titanium oxide fine particles in the PET constituting the segment A was as shown in Table 1.

(Comparative example 2)
The process was performed in the same manner as in Example 1 except that the content of titanium oxide fine particles in the PET constituting the segment A was as shown in Table 1.

(Comparative example 3)
As a synthetic resin constituting the segment A, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 5 mass% of titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET having an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4% by mass of titanium oxide fine particles (TiO ₂ ) were contained.

  The mass ratio of the segment A to the segment B (segment A / segment B) is 75/25 using PET constituting the segment A and segment B, and the cross-sectional shape with respect to the single yarn longitudinal direction is FIG. Using the nozzle having a composite shape shown in (b), the content of the titanium oxide fine particles is 5 instead of the synthetic resin part 10 having the content of the inorganic oxide fine particles of 5 to 30% by mass shown in FIG. A segment made of PET having a content of titanium oxide fine particles of 0.4% by mass instead of the synthetic resin portion 11 shown in FIG. 2 (b) which does not contain the inorganic oxide fine particles shown in FIG. As B, a multifilament was spun at a spinning temperature of 295 ° C. using a conventional composite spinning apparatus. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. 48 multifilament yarns were obtained. In addition, EC and DC were measured and calculated using this multifilament yarn. As a result, EC was 15%, and DC was judged as ◎ (DC was 5% or less in all leaves).

Using only the obtained multifilament yarn, after obtaining 49 wales / 2.54 cm, 53 courses / 2.54 cm as a smooth texture with a circular knitting machine, it is scoured by a usual method, and the following formulation Staining was carried out at a temperature of 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary agent Nikka sun salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric.

(Comparative example 4)
As a synthetic resin constituting the segment A, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 5 mass% of titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET having an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4% by mass of titanium oxide fine particles (TiO ₂ ) were contained.

  The mass ratio of the segment A to the segment B (segment A / segment B) is 75/25 using the PET constituting the segment A and the segment B, and the composite shape in the cross section to the single yarn longitudinal direction is Using a nozzle having a composite shape shown in FIG. 2 (a), the content of the titanium oxide particles is 5 mass% instead of the portion 7 containing the inorganic oxide particles shown in FIG. 2 (a) in high concentration As a segment A made of PET, a segment B made of PET having a content of 0.4% by mass of titanium oxide fine particles instead of the portion 8 not containing the inorganic oxide fine particles shown in FIG. The apparatus was used to spin multifilament at a spinning temperature of 295 ° C. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. 48 multifilament yarns were obtained. EC and DC were measured and calculated using the multifilament yarn. As a result, EC is 0%, DC is determined as x (the ratio (%) of the distance (μm) from the outer periphery of the single yarn to the segment A to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn) Is 13.1%).

Using only the obtained multifilament, after obtaining 49 wales / 2.54 cm, 53 courses / 2.54 cm as a smooth texture with a circular knitting machine, it is scoured by a conventional method and temperature is determined by the following formulation Dyeing was performed at 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary agent Nikka sun salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric.

(Comparative example 5)
As a synthetic resin constituting the segment A, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 5 mass% of titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET having an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4% by mass of titanium oxide fine particles (TiO ₂ ) were contained.

  Using the PET constituting the segment A and the segment B, the mass ratio of the segment A to the segment B (segment A / segment B) is 75/25, and the cross-sectional shape (of the leaf portion) of FIG. (Multiple: 20), and a multifilament was spun at a spinning temperature of 295 ° C. using a conventional compound spinning device using a nozzle having an EC of 15%. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and the hollow part were measured and calculated using this multifilament. As a result, EC is 15%, DC judgment is ◎ (DC not more than 5% in all leaves), shortest distance between adjacent leaves is 0.7 μm, hollow ratio is 15% It was.

Using only the obtained multifilament, a knitted fabric of 49 wales / 2.54 cm and 53 courses / 2.54 cm was obtained as a smooth structure with a circular knitting machine, and then scoured by a conventional method, and the temperature was determined according to the following prescription. Dyeing was performed at 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary agent Nikka sun salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric. The content of the titanium oxide fine particles in the PET constituting the segment A is set as shown in Table 1, and the same procedure as in Example 1 was performed except that a nozzle with an EC of 15% was used to obtain a multifilament yarn and a knitted fabric. It was.

(Comparative example 6)
A synthetic resin forming segment A was made into a chip of PET having an intrinsic viscosity of 0.65 according to a conventional method and dried, and titanium oxide fine particles (TiO ₂ ) were contained in an amount of 3% by mass as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET having an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4% by mass of titanium oxide fine particles (TiO ₂ ) were contained.

  Using the PET constituting the segment A and the segment B, the mass ratio between the segment A and the segment B (segment A / segment B) is 75/25, and the cross-sectional shape (the leaf portion) of FIG. (Multiple: 20), and a multifilament was spun at a spinning temperature of 295 ° C. using a conventional composite spinning device using a nozzle having a hollow ratio of 3%. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. 48 multifilament yarns were obtained. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and a hollow part were measured and calculated using this multifilament yarn. As a result, EC was 0% (the segment A was not confirmed to be exposed on the surface of the single yarn), DC was evaluated as ◎ (DC is 5% or less in all leaf portions), and the leaf portions adjacent to each other The shortest distance to the leaf was 0.3 μm, and the hollow ratio was 3%.

Using only the obtained multifilament yarn, after obtaining a knitted fabric of 49 wales / 2.54 cm and 53 courses / 2.54 cm as a smooth structure with a circular knitting machine, scouring by a conventional method and using the following prescription Dyeing was performed at a temperature of 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary agent Nikka sun salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric.

(Comparative example 7)
A synthetic resin forming segment A was made into a chip of PET having an intrinsic viscosity of 0.65 according to a conventional method and dried, and titanium oxide fine particles (TiO ₂ ) were contained in an amount of 3% by mass as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4 mass% of titanium oxide fine particles (TiO ₂ ) was contained.

  Using the PET constituting the segment A and the segment B, the mass ratio between the segment A and the segment B (segment A / segment B) is 75/25, and the cross-sectional shape (the leaf portion) of FIG. The multifilaments were spun at a spinning temperature of 295 ° C. using a conventional composite spinning apparatus with a nozzle having a number of 20 and a hollow ratio of 40%.

(Comparative example 8)
As a synthetic resin constituting the segment A, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 5 mass% of titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles. As a synthetic resin constituting the segment B, PET with an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and 0.4 mass% of titanium oxide fine particles (TiO ₂ ) was contained.

  Using the PET constituting the segment A and the segment B, the mass ratio of the segment A and the segment B (segment A / segment B) is 75/25, and the cross-sectional shape of FIG. A multifilament was spun at a spinning temperature of 295 ° C. using a nozzle and a conventional compound spinning device. Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. 48 multifilament yarns were obtained. In addition, EC, DC, and the hollow rate were measured and calculated using this multifilament yarn. As a result, EC is 0%, DC is determined as x (the ratio (%) of the distance (μm) from the outer periphery of the single yarn to the segment A to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn) Is 13.1%) and the hollow rate is 15%.

Using only the obtained multifilament, a knitted fabric of 49 wales / 2.54 cm and 53 courses / 2.54 cm was obtained as a smooth structure with a circular knitting machine, and then scoured by a conventional method, and the temperature was determined according to the following prescription. Dyeing was performed at 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary agent Nikka sun salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF, TF and cover factor were measured and calculated using the knitted fabric.

(Reference Example 1)
A synthetic resin forming segment A was made into a chip of PET having an intrinsic viscosity of 0.65 according to a conventional method and dried, and titanium oxide fine particles (TiO ₂ ) were contained in an amount of 3% by mass as inorganic oxide fine particles. Intrinsic viscosity 0.73 obtained by copolymerizing 2.5 mol% of 5-sodium sulfoisophthalic acid (SIP-Na) and 13.3 wt% of polyethylene glycol (PEG) having an average molecular weight of 8000 as a synthetic resin constituting the segment B Copolymerized PET (alkali-soluble polyester) was chipped by a conventional method and dried.

  The mass ratio of the segment A to the segment B (segment A / segment B) is 75/25 using the PET constituting the segment A and the copolymerized PET constituting the segment B, as shown in FIG. A multifilament was spun at a spinning temperature of 295 ° C. using a conventional composite spinning apparatus using a nozzle having a surface shape (number of leaves: 20). Then, the spun multifilament is cooled, applied with an oil, taken up with a take-up roller at a speed of 3000 m / min, then drawn at a temperature of 90 ° C. and a draw ratio of 1.50, heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. EC, DC, and hollow ratio were measured and calculated using the multifilament yarn.

Using only the obtained multifilament yarn, 49 wales / 2.54 cm, 53 courses / 2.54 cm knitted fabrics were obtained as a smooth structure by a circular knitting machine. The cover factor was measured using the knitted fabric. The knitted fabric was subjected to alkali treatment to elute segment B, and the leaf portion of segment A was divided, and then stained according to the following formulation at a temperature of 130 ° C. for 30 minutes.
Dye UVITEX EBF: 1% omf
Auxiliary Nikka Sun Salt SN-130: 0.5 g / l
Acetic acid: 0.2 ml / l

  After dyeing, finishing was performed to obtain a knitted fabric. CT, UPF and TF were measured and calculated using the knitted fabric.

  The evaluation results of the obtained knitted fabric are shown in Table 1.

  As shown in Table 1, Examples 1 to 9 all passed the obtained knitted fabric for CT, UPF and TF. That is, the knitted fabric has excellent coolness and UV protection properties, and can also have excellent see-through preventing properties even when the woven or knitted fabric is moistened by perspiration or the like. In particular, in Examples 2 to 5, when the content of the titanium oxide fine particles in the segment A was 5 to 8% by mass, the cool feeling and the see-through preventing effect when wet were particularly excellent. In Example 2, the DC judgment was ◎ (DC is 5% or less in all leaves), whereas in Example 9, the DC judgment was ○ (DC in all leaves was 5%). And 10% or less). As a result, the knitted fabric obtained in Example 2 is particularly excellent in CT, UPF and TF as compared with the knitted fabric obtained in Example 8, and is particularly excellent in coolness, UV protection, and see-through when wet. It was a thing.

  On the other hand, in Comparative Example 1, since the content of titanium oxide fine particles in segment A was less than 2% by mass, CT, UPF and TF of the obtained knitted fabric did not satisfy the acceptance criteria, and the cooling sensitivity and the prevention of ultraviolet rays were obtained. It was inferior in the ability to prevent the permeation of water and moisture.

  In Comparative Example 2, since the content of the titanium oxide fine particles in the segment A exceeded 10% by mass, a single yarn could not be spun and a multifilament yarn and a knitted fabric could not be obtained.

  In Comparative Example 3, since the cross sectional shape of the single yarn constituting the multifilament yarn is as shown in FIG. 2B, the obtained multifilament yarn is a segment with respect to the outer peripheral length (μm) of the single yarn. The ratio (EC) of the exposed length (μm) of A on the surface of the single yarn exceeded 10%. From this, it became inferior to the spinning operativity of a multifilament yarn, and the process passage property in a thread making process and a knitting process. In addition, since the shape of the segment A consisted of only a straight line part that does not include a curved part, the obtained knitted fabric did not satisfy the acceptance criteria, and was inferior in see-through property when wet. .

  In Comparative Example 4, the cross-sectional shape of the single yarn constituting the multifilament is shown in FIG. 2 (a). In the cross-section of the single yarn constituting the multifilament, the single yarn is separated from the center of the single yarn. The ratio (%) of the distance (μm) from the outer periphery of the single yarn to the segment A with respect to the distance (μm) to the outer periphery of the yarn exceeded 10% (13.1%). From this, the area which sunlight can permeate in segment B becomes large, and the obtained knitted fabric is inferior in coolness and the ability to prevent see-through when wet because CT and TF do not satisfy the acceptance criteria.

  In Comparative Example 5, the ratio (EC) of the exposed length (μm) of the segment A to the surface of the single yarn with respect to the outer peripheral length (μm) of the single yarn exceeded 10%. The yarn was inferior in spinning operability and process passability.

  In Comparative Example 6, since the hollow percentage was less than 5%, CT, UPF, and TF did not satisfy the pass criteria for the obtained knitted fabric, and the coolness, the ultraviolet ray blocking property, and the moisture permeation preventing property were poor. It was a thing.

  In Comparative Example 7, since the hollowness ratio exceeds 30%, peeling and crushing of the hollow portion occur in most of the single yarns constituting the multifilament yarn, and the spinning property is significantly deteriorated and stabilized. It was not possible to spin the multifilament and to obtain a knit.

  Comparative Example 8 is a core-sheath hollow single yarn in which the segment A does not contain a leaf, and from the outer periphery of the single yarn to the segment A with respect to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn. The ratio (%) of the distance (μm) was greater than 10% (13.1%). From this, the obtained knitted fabric did not satisfy the pass criteria for CT and TF, and was inferior in coolness and wet shedding prevention.

  In Reference Example 1, the segment B was a polyester which is an alkali-soluble component, and the segment B was dissolved and removed from the knitted fabric to divide the leaf portion. Therefore, since the fiber which comprises the obtained knitted fabric does not have a hollow part, CT and TF did not satisfy the acceptance criteria, and it was inferior to coolness and the see-through prevention property at the time of wetness.

(Example 10)
In Example 1, the total fineness / number of filaments of the multifilament yarn is 165 dtex / 48 filament yarn, and the knitting structure is a mock-rod structure (as a knitting machine, “LPJ-H” (33 ″ × 22 gauge) manufactured by Fukuhara Seiki Co., Ltd.) A knitted fabric was obtained in the same manner as in Example 1. This knitted fabric was used as an upper material, and was bonded to a sole made of synthetic rubber using an adhesive, and further a string was attached to make a shoe. The shoes thus obtained were excellent in lightness, and the inside of the shoes was kept comfortable even in a high temperature environment.

1 Single yarn 2 Synthetic resin part in which the content ratio X (mass%) of inorganic oxide fine particles is 2 <X ≦ 10 3 Synthetic resin part in which the content ratio Y (mass%) of inorganic oxide fine particles is 2 mass% or less 4 leaf part 5 hollow part 6 composite fiber 7 arranged concentrically according to the prior art 7 part containing inorganic oxide fine particles at high concentration part 8 containing no inorganic oxide fine particle 9 composite fiber according to the prior art 10 inorganic Synthetic resin part 11 containing 5 to 30% by mass of oxide fine particles Synthetic resin part 12 containing no inorganic oxide fine particles 12 expanded polystyrene 13a, 13b holes
14a, 14b Woven knitted fabric 15a, 15b Thermocouple

Claims (13)

A multi that includes a synthetic resin portion in which the content ratio X (mass%) of the inorganic oxide particles is 2 <X ≦ 10, and a synthetic resin component in which the content ratio Y (mass%) of the inorganic oxide particles is 2 mass% or less A filament yarn,
A multifilamentary yarn characterized in that the cross-sectional shape of the single yarn constituting the multifilamentary yarn with respect to the longitudinal direction satisfies the following (1) to (6).
(1) The shape of the synthetic resin portion in which the content ratio X (mass%) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is 6 to 30 radially directed from the center side to the outer circumference side of the single yarn. Multi-leaf shape including individual leaves.
(2) The tip on the outer peripheral side of the leaf is curved.
(3) The exposed length (μm) of the synthetic resin portion having a content ratio X (mass%) of the inorganic oxide fine particles to 2 <X ≦ 10 with respect to the outer peripheral length (μm) of the single yarn The ratio is 10% or less.
(4) The average ratio of the shortest distance (μm) from the outer periphery of the single yarn to the leaf portion with respect to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn is 10% or less.
(5) The hollow rate of the single yarn is 5 to 30%.
(6) Each of the leaves is separated from each other all around, and the shortest distance measured and calculated by the following method of the adjacent leaves is 0.1 to 2.0 μm.
(Method)
Take out the single yarn from the multifilament, observe the cross section of the single yarn taken out in the longitudinal direction with an optical microscope (PCSCOPE PCS-81X made by INABATA & CO), and the shortest distance (μm) between the adjacent leaf portions in the separated leaf portion ) Is measured for all the separated leaves in the cross section, and the average value is defined as the shortest distance (μm) between the adjacent leaves and the leaves. A multi that includes a synthetic resin portion in which the content ratio X (mass%) of the inorganic oxide particles is 2 <X ≦ 10, and a synthetic resin component in which the content ratio Y (mass%) of the inorganic oxide particles is 2 mass% or less A filament yarn,
A multifilamentary yarn characterized in that the cross-sectional shape of the single yarn constituting the multifilamentary yarn with respect to the longitudinal direction satisfies the following (1) to (7).
(1) The shape of the synthetic resin portion in which the content ratio X (mass%) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is 6 to 30 radially directed from the center side to the outer circumference side of the single yarn. Multi-leaf shape including individual leaves.
(2) The tip on the outer peripheral side of the leaf is curved.
(3) The exposed length (μm) of the synthetic resin portion having a content ratio X (mass%) of the inorganic oxide fine particles to 2 <X ≦ 10 with respect to the outer peripheral length (μm) of the single yarn The ratio is 10% or less.
(4) The average ratio of the shortest distance (μm) from the outer periphery of the single yarn to the leaf portion with respect to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn is 10% or less.
(5) The hollow rate of the single yarn is 5 to 30%.
(6) The hollow portion is disposed in the synthetic resin portion having a content Y (mass%) of the inorganic oxide fine particles of 2% by mass or less in the central portion of the single yarn, and the leaf portion is the hollow portion It is arranged so as to surround.
(7) Each of the leaves is separated from each other all around, and the shortest distance measured and calculated by the following method of the leaves adjacent to each other is 0.1 to 2.0 μm.
(Method)
Take out the single yarn from the multifilament, observe the cross section of the single yarn taken out in the longitudinal direction with an optical microscope (PCSCOPE PCS-81X made by INABATA & CO), and the shortest distance (μm) between the adjacent leaf portions in the separated leaf portion ) Is measured for all the separated leaf portions in the cross section, and the average value is defined as the shortest distance (μm) between the leaf portions adjacent to each other. A multi that includes a synthetic resin portion in which the content ratio X (mass%) of the inorganic oxide particles is 2 <X ≦ 10, and a synthetic resin component in which the content ratio Y (mass%) of the inorganic oxide particles is 2 mass% or less A filament yarn,
A multifilamentary yarn characterized in that the cross-sectional shape of the single yarn constituting the multifilamentary yarn with respect to the longitudinal direction satisfies the following (1) to (7).
(1) The shape of the synthetic resin portion in which the content ratio X (mass%) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is 6 to 30 radially directed from the center side to the outer circumference side of the single yarn. Multi-leaf shape including individual leaves.
(2) The tip on the outer peripheral side of the leaf is curved.
(3) The exposed length (μm) of the synthetic resin portion having a content ratio X (mass%) of the inorganic oxide fine particles to 2 <X ≦ 10 with respect to the outer peripheral length (μm) of the single yarn The ratio is 10% or less.
(4) The average ratio of the shortest distance (μm) from the outer periphery of the single yarn to the leaf portion with respect to the distance (μm) from the center of the single yarn to the outer periphery of the single yarn is 10% or less.
(5) The hollow rate of the single yarn is 5 to 30%.
(6) The outer peripheral shape of the single yarn is circular.
(7) Each of the leaves is separated from each other all around, and the shortest distance measured and calculated by the following method of the leaves adjacent to each other is 0.1 to 2.0 μm.
(Method)
Take out the single yarn from the multifilament, observe the cross section of the single yarn taken out in the longitudinal direction with an optical microscope (PCSCOPE PCS-81X made by INABATA & CO), and the shortest distance (μm) between the adjacent leaf portions in the separated leaf portion ) Is measured for all the separated leaf portions in the cross section, and the average value is defined as the shortest distance (μm) between the leaf portions adjacent to each other.   The shape of the synthetic resin part in which the content ratio X (mass%) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is 20 to 30 leaves radially from the center side to the outer periphery side of the single yarn. The multifilament yarn according to any one of claims 1 to 3, wherein the multifilament yarn has a multilobal shape including a portion.   The content X (mass%) of the inorganic oxide fine particles is 2 <X ≦ 10. The synthetic resin constituting the synthetic resin portion and the content Y (mass%) of the inorganic oxide fine particles are 2 mass% or less. The multifilament yarn according to any one of claims 1 to 4, wherein the synthetic resin constituting the synthetic resin portion is polyester.   A synthetic resin part in which the content X (mass%) of the inorganic oxide fine particles is 2 <X ≦ 10 and a synthetic resin part in which the content Y (mass%) of the inorganic oxide fine particles is 2 mass% or less. The multifilament yarn according to any one of claims 1 to 5, wherein the mass ratio is 30/70 to 90/10.   A woven or knitted fabric comprising the multifilament yarn according to any one of claims 1 to 6.   The fabric according to claim 7, wherein the cover factor (CF) is 1000 to 3500.   The knitted fabric according to claim 7, wherein the cover factor (CF) is 500 to 2,500.   Cooling property (CT) is 2.0 or more, The woven or knitted fabric according to any one of claims 7 to 9.   The woven or knitted fabric according to any one of claims 7 to 10, wherein the ultraviolet protection index (UPF) is 30 or more. The woven or knitted fabric according to any one of claims 7 to 11, wherein the degree of reduction in the degree of anti-permeability (TF) represented by the following formula (I) is 8.0% or less.
A shoe material comprising the woven or knitted fabric according to any one of claims 7 to 12.