JP2014234578A - Multifilament yarn and woven and knitted fabric thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multifilament yarn and woven and knitted fabric good in spinning operability or the like, excellent in cool feeling, ultraviolet-preventing property and transparency-preventing property at wetting.SOLUTION: There is provided a multifilament yarn containing a synthetic resin part having a percentage content X (mass%) of an inorganic oxide fine particle of 2<X≤10 and a synthetic resin part having a percentage content Y (mass%) of the inorganic oxide fine particle Y of 2 mass% or less, and having a transverse section shape satisfying the following (1) to (4). (1) The synthetic resin part having the percentage content X (mass%) of an inorganic oxide fine particle of 2<X≤10 has a multi leaf shape containing 6 to 20 leaf parts which direct radially from a center side to an outer peripheral side of single yarn. (2) A tip part of the outer peripheral side of each leaf part has a curve shape. (3) The synthetic resin part having the percentage content X (mass%) of an inorganic oxide fine particle of 2<X≤10 has a percentage of exposed length (μm) to a surface of the single yarn is 10% or less. (4) An average percentage of the shortest distance (μm) from the outer periphery to the leaf part of the single yarn is 10% or less.

Description

  The present invention is a multifilament yarn that has excellent spinning operability, processability in the yarn making process and weaving and knitting process, and excellent sensation of coolness, ultraviolet rays, and see-through when wet when used as a woven or knitted fabric. And its woven or knitted fabric.

  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 filament contains inorganic oxide fine particles in a high concentration, the inorganic oxide fine particles are exposed on the filament surface, and the exposed inorganic oxide fine particles cause guide wear in the yarn making and weaving and knitting processes. The problem of process passability arises. In order not to cause the problem of process passability, the inorganic oxide fine particles can be contained only at about 2% by mass, and the resulting knitted or knitted fabric has a sufficient effect in coolness and see-through prevention. 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 is composed of a portion 8 containing inorganic oxide fine particles at a high concentration and a portion 9 not containing inorganic oxide fine particles, with the portion 8 serving as a core portion and the portion 9 serving as a sheath portion. In addition, there is known a composite fiber 7 arranged concentrically. According to the composite fiber 7, the coolness and the see-through preventing effect when it is made into a woven or knitted fabric are enhanced to some extent without causing a problem of process passability.

  Further, as shown in FIG. 2B, the composite fiber is composed of a synthetic resin portion 11 having a content of inorganic oxide fine particles of 5 to 30% by mass and a synthetic resin portion 12 not containing inorganic oxide fine particles. Thus, a composite fiber 10 in which the synthetic resin portion 12 is divided into three or more layers by the synthetic resin portion 11 and the synthetic resin portion 12 occupies 50% or more of the composite fiber surface is known (for example, Patent Document 1). reference.). According to the composite fiber 10, since the area through which sunlight passes is reduced, it is possible to expect an effect of cooling feeling and prevention of see-through.

JP-A-5-247723

  However, since the composite fiber 7 shown in FIG. 2 (a) has a concentric composite shape, the portion 9 that does not contain the inorganic oxide fine particles has many areas through which sunlight passes, and a sufficient effect is also obtained. I couldn't say that. In addition, the conjugate fiber 10 shown in FIG. 2 (b) has limited coolness and see-through preventing effect to a certain degree. Therefore, when increasing the sunlight shielding effect of the composite fiber 10, it is necessary to increase the ratio of the synthetic resin portion 11, but the area of the synthetic resin portion 11 exposed on the surface of the composite fiber 10 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, when the conjugate fiber 10 shown in FIG. 2 (b) is a woven or knitted fabric, the see-through property when wet is insufficient, and the sense of seeing through before and after sweating is used when used for sports or summer shirts. There was also a problem that changed significantly.

  The present invention solves the above-mentioned problems, has good spinning operability, good processability in the yarn-making process and weaving and knitting process, and when used as a knitted or knitted fabric, has coolness, UV protection and transparency 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 have entered the synthetic resin portion 11 because the composite fiber shown in FIG. 2B has a linear cross-sectional shape of the synthetic resin portion 11 containing inorganic oxide fine particles at a high concentration. The reflection of sunlight was simplified, and it was speculated that diffuse reflection did not occur sufficiently, and it was found that the anti-transparency when wet was insufficient. Furthermore, the inventors have found for the first time that the anti-through-performance performance when wet is made particularly noticeable by setting a specific cross-sectional shape in the cross-sectional shape of the fiber, and reached the present invention. That is, the gist of the present invention is the following (1) to (9).

(1) Synthetic resin part having an inorganic oxide fine particle content X (mass%) of 2 <X ≦ 10 and a synthetic resin part having an inorganic oxide fine particle content Y (mass%) of 2% by mass or less A multifilament yarn comprising: a multifilament yarn having a cross-sectional shape with respect to a longitudinal direction of a single yarn constituting the multifilament yarn satisfying the following (i) to (iv):
(I) The shape of the synthetic resin portion in which the content X (% by mass) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is radially directed from the center side to the outer peripheral side of the single yarn 6 to 20 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 where the content X (mass%) of the inorganic oxide fine particles is 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.
(2) 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%. The multifilament yarn according to (1), wherein the synthetic resin constituting the synthetic resin portion is polyester.
(3) A synthetic resin part in which the content X (mass%) of the inorganic oxide fine particles is 2 <X ≦ 10 and a synthetic resin in which the content Y (mass%) of the inorganic oxide fine particles is 2% by mass or less The multifilament yarn according to (1) or (2), wherein the mass ratio to the part is 30/70 to 90/10.
(4) A woven or knitted fabric comprising the multifilament yarn according to any one of (1) to (3).
(5) The woven fabric according to (4), wherein the cover factor (CF) is 1000 to 3500.
(6) The knitted fabric according to (4), wherein the cover factor (CF) is 500 to 2500.
(7) The knitted or knitted fabric according to any one of (4) to (6), wherein the cooling property (CT) is 2.0 or more.
(8) The woven or knitted fabric according to any one of (4) to (7), which has an ultraviolet prevention index (UPF) of 30 or more.
(9) The woven or knitted fabric according to any one of (4) to (8), which has a permeability reduction degree (TF) represented by the following formula (I) of 8.0% or less.

  According to the multifilament yarn of the present invention, the spinning operability, the processability in the yarn making process and the weaving and knitting process are good, and when it is made into a woven or knitted fabric, the cool feeling, the ultraviolet ray preventing property, and the prevention of see-through when wet. Excellent in properties. Moreover, according to the woven or knitted fabric of the present invention, it is excellent in coolness, UV protection, and see-through resistance 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.

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 prior art 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.

  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 typified by polypropylene and polyethylene, polychlorinated polymers typified by polyvinyl chloride and polyvinylidene chloride, polytetrafluoroethylene and copolymers thereof, fluorinated polymers typified by polyvinylidene fluoride, PLA (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, process passability, and the like, polyester and polyamide are preferred.

  In the present invention, the synthetic resin constituting the segment A and the synthetic resin constituting the segment B are preferably a combination having excellent compatibility. For example, when both the synthetic resin that constitutes the segment A and the synthetic resin that constitutes the segment B are made of polyester, they tend to be excellent in compatibility. 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, it is more preferable because it has excellent thermal stability.

  Among the above synthetic resins, for example, polyesters include aromatic dicarboxylic acids such as isophthalic acid and 5-sulfoisophthalic acid, adipic acid, succinic acid, suberic acid, and sebacic acid while 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 sunlight shielding effect are suitable, 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. . When the content X is 2 <X ≦ 10, the spinning operability is improved, and when the multifilament yarn of the present invention is used as a woven or knitted fabric, a cool sensation is obtained by making the specific cross-sectional shape described later. It has excellent properties, UV resistance and anti-translucency when wet.

  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 rate, the multifilament yarn of the present invention has good processability in spinning operability, yarn making process and weaving and knitting process. Spinning operability and process passability can be improved.

  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. You may add an agent, a reinforcing agent, etc. in the range which does not impair the effect.

  The shape of the segment A in the cross section with respect to the longitudinal direction of the single yarn constituting the multifilament yarn is a multi-leaf shape including 6 to 20 leaf portions radially extending from the center side to the outer peripheral side of the single yarn. is necessary.

  1A to 1H illustrate an embodiment of a cross-sectional shape with respect to the longitudinal direction of a single yarn constituting the multifilament yarn of the present invention (hereinafter sometimes abbreviated as a composite shape of the present invention). It is a schematic diagram to do. As illustrated in FIGS. 1A to 1H, in the composite shape of the present invention, the segment A has leaf portions 4a to 4h that radiate from the center side of the single yarn 1 to the outer peripheral side. As illustrated in FIG. 1A, the leaf portions 4a to 4h may be connected to each other. Further, as illustrated in FIGS. 1B to 1E, the leaf portion may be connected to the portion 5 other than the leaf portion.

  As illustrated in FIG. 1 (h), the leaves may exist separately in the segment B. In this case, all the leaf portions may be separated, or some of the 6 to 20 leaf portions may be connected and the rest may be separated by the segment B. In addition, as illustrated in FIG. 1 (g), the composite shape of the present invention may have a hollow portion 6.

  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. Thereby, the anti-slipping property when wet in the case of a woven or knitted fabric is particularly excellent.

  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 multi-leaf shape including 6 to 20 leaf portions that radiate from the center side to the outer peripheral side of the single yarn. The interval between the leaf portions can be small. Further, preferably, by setting the interval to be a specific one, it becomes easy to repeat that the sunlight which is incident on one of the leaf portions and diffusely reflected is further diffusely reflected by the adjacent leaf portions, and the leaf portions which will be described later Combined with the effect of making the shape of the material a specific shape, it is presumed that the anti-slipping property when wet when made into a woven or knitted fabric is excellent.

  In addition, the leaf portion needs to have a curved end portion on the outer peripheral side. 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.

  In the present invention, the leaf shape is not particularly limited as long as the tip is a curved shape, and may have a straight portion other than the curved tip, or may be entirely curved. . For example, in the case where they are connected to each other, a substantially collapsible needle shape having a curved shape as a whole as illustrated in FIG. In the case where it is connected to a portion other than the leaf portion, there are a substantially semi-elliptical shape, a substantially semi-circular shape, a substantially collapsible shape, etc., which are entirely curved as illustrated in FIGS. It is done. In the case where they are separated from each other, a shape having a tip portion and a straight portion made of a substantially semicircular shape or a substantially semielliptical shape illustrated in FIG. Is mentioned. In addition, the leaf portion does not need to be smooth in each side of, for example, a substantially collapsible needle shape, a substantially semi-elliptical shape, a substantially semi-circular shape, and a substantially straight portion, for example, a minute convex portion illustrated in FIG. And / or a thing provided with a recessed part and what consists of wavy lines may be sufficient.

  In the composite yarn of the present invention, 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 with respect to the outer peripheral length (μm) of the single yarn. It must be 10% or less, and 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. Thereby, since the amount of sunlight passing through the region increases, the obtained multifilament is inferior in coolness when it is made into a woven or knitted fabric, anti-ultraviolet rays, and see-through properties when wet.

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

  In the composite shape of the present invention, the shape of the segment A is preferably rotationally symmetric. 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. Since the shape of the segment A is rotationally symmetric, the single yarn spun from the spinning nozzle exhibits the phenomenon of so-called yarn bending, and there is a problem that stable spinnability and good yarn quality cannot be obtained. It becomes difficult. Further, the shielding of the segment A that contributes to the prevention of see-through hardly shifts, and uniform see-through prevention can be easily obtained 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 cool sensation when it is made into a woven or knitted fabric, anti-ultraviolet rays, and see-through properties when wet. 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 has good processability in the spinning operability, the yarn making process and the weaving / knitting process, and the woven / knitted product is used. 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.

  In the present invention, the single yarn fineness is preferably from 0.1 to 10 dtex, more preferably from 0.3 to 5 dtex, and even more preferably from 0.5 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 may be a processed yarn that has been subjected to processing such as false twisting, actual twisting, looping, or interlacing.

  The woven or knitted fabric of the present invention needs to be made of the multifilament yarn of the present invention. The knitted or knitted fabric of the present invention comprises the multifilament yarn of the present invention, so that it has excellent coolness and UV protection, and also has excellent see-through properties even when the woven or knitted fabric becomes wet due to sweating or the like. Can do.

  The knitted 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 further preferably 3.0 or more. The higher the value of CT, the better the knitted or knitted fabric is cool.

  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, CT measurement is performed by providing holes 14 a and 14 b having a length of 8 cm, a width of 8 cm, and a depth of 0.7 cm on the upper surface side of the foamed polystyrene 13 having a height of 20 cm. A device provided with thermocouples 16a and 16b at the center of the bottom is used. The woven or knitted fabric to be measured is cut into a square having a side of 10 cm, and the cut woven or knitted fabric 15a is attached to the upper surface of the polystyrene foam 13 so as to cover one hole 14a. 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. The woven or knitted fabric 15b having the same structure as the woven or knitted fabric to be measured is pasted so as to cover the other hole 14b in the same manner as the woven or knitted fabric 15a to be measured. 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 16a provided in the hole 14a to which the woven or knitted fabric 15a to be measured is attached after 15 minutes. The temperature (T1 (° C)) and the temperature (T2 (° C)) of the thermocouple 16b provided in the hole 14b where the woven or knitted fabric 15b used as a blank is pasted are measured, and the difference between the 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 15a to be measured and the woven or knitted fabric 15b to be blank is 95000 lux to 105000 lux.

  In order to increase the CT in the woven or knitted fabric of the present invention, in addition to improving the sun shielding property of the multifilament yarn of the present invention itself, the mixing ratio of the multifilament yarn and the cover factor of the woven or knitted fabric described later are appropriate. 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 anti-ultraviolet index (UPF) is based on the Australian New Zealand standard (AS / NZS; 4399: 1996) in consideration of a predetermined damage coefficient in the ultraviolet transmittance of 280 to 400 nm measured using a spectrophotometer, Is to be calculated.

  The higher the UPF value, the higher the ultraviolet shielding performance, and the UPF value of 30 or higher is preferable because it has a rating of “Very good protection” or higher, and the effect of protecting the skin from ultraviolet rays and preventing damage is further enhanced. In order to make the UPF of the woven or knitted fabric of the present invention high, in addition to enhancing the sun shielding property of the multifilament yarn itself, for example, it is easy by making the mixing ratio and cover factor described later appropriate. Become.

  The woven or knitted fabric of the present invention preferably has a permeation reduction degree (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. The dry sample is a sample obtained by adjusting a woven or knitted fabric for 24 Hrs in an environment of 20 ° C. and 65% RH, and the wet sample is a sample obtained by adjusting a woven or knitted fabric for 24 Hrs in an environment of 20 ° C. and 65% RH. A sample containing the same amount of water as the sample.

  In order to reduce the TF (%) of the woven or knitted fabric of the present invention, the multifilament yarn of the present invention itself is made to improve the see-through resistance when wet when the multifilament yarn is used as a woven or knitted fabric. In addition to this, for example, it becomes possible by making the mixture ratio and 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. In the woven or knitted fabric of the present invention, the mixing ratio is desirably 100% by mass in order to sufficiently shield sunlight, but if it is 25% by mass or more, the coolness, the ultraviolet ray prevention property, and the see-through property when wet are prevented. It becomes easy to be enough. Examples of the mixing method include mixed spinning, twisting and knitting.

  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, particularly preferably 1500 to 2500 when the cover factor (CF) is a 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 2500, and particularly preferably 800 to 1800. Here, the cover factor (CF) is calculated by the following formula (II) in the case of a woven fabric, and is calculated by the following formula (III) in the case of a knitted fabric.

here,
DT: Fineness of multifilament yarn (dtex)
WAD: Warp density (main / 2.54cm)
WED: Weft density (main / 2.54cm)
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. In the case of method A of a, knitted fabric JIS L 1096: 2010 8.9.9.1. 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.

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

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

(1) Ratio (EC) of the exposure length (μm) of the segment A to the single yarn surface with respect to the outer peripheral length (μm)
The cross section of the single yarn taken out from the multifilament with respect to the longitudinal direction was 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) Was measured and the ratio (EC (%)) to the single yarn outer peripheral length (μm) was calculated by the following equation.
EC = exposed length of segment A (μm) / filament outer peripheral length (μm) × 100 (%)

(2) The average ratio (DC) of the shortest distance (μm) from the outer periphery of the single yarn to the leaf portion relative 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 portion in each leaf portion with respect to the distance (μm) from the center of the single yarn to the single yarn outer periphery was calculated by the following equation. .
DC = average value of the shortest distance from the outer periphery of the single yarn to each leaf (μm) / distance from the center of the single yarn to the outer periphery of the single yarn (μm) × 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 over 5% and less than 10%.
X: When DC exceeds 10%.

(3) 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. All the separated leaf portions in the cross section were measured, and the average value was defined as the shortest distance (μm) between the leaf portions adjacent to each other.

(4) Cooling property (CT)
As shown in FIGS. 4 and 5, holes 20a, 14b 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 foamed polystyrene 13 having a height of 20 cm, and thermoelectrics are provided at the centers of the bottoms of the holes 14a, 14b. An apparatus provided with pairs 16a and 16b 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 15a was attached to the upper surface of the polystyrene foam 13 so as to cover one hole 14a. 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. The woven / knitted fabric 15b having the same structure as the woven / knitted fabric to be measured was pasted so as to cover the other hole 14b in the same manner as the woven / knitted fabric 15a to be measured. 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 16a provided in the hole 14a to which the woven or knitted fabric 15a to be measured is attached after 15 minutes. The temperature (T1 (° C)) and the temperature (T2 (° C)) of the thermocouple 16b provided in the hole 14b where the woven or knitted fabric 15b used as a blank is pasted are measured, and the difference between the temperatures (T2-T1 (° C)) ) Was designated as CT. The measurement was performed under the condition that the illuminance on the surface of the woven or knitted fabric 15a to be measured and the woven or knitted fabric 15b to be blank was 100,000 lux. In the present invention, a sample having a CT of 2.0 or more was accepted.

(5) 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.

(6) Permeability reduction degree (TF)
Using a Macbeth MS-2020 spectrophotometer, the sample whiteness (WId) when dried and the sample whiteness (WIw) when wet were measured and calculated according to the following formula. 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.

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

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.

(8) Spinning operability Spinning was carried out continuously for 24 hours, and evaluated according to the following three stages according to the number of cut yarns during operation (per spindle).
○: 0 to 1 time Δ: 2 to 3 times ×: 4 or more

(9) Process passability 10 knitting needles without scratches or wear are selected at random before knitting, and the selected knitting needles after knitting are observed using an optical microscope. Evaluation was performed.
○: Scratches and wear are not recognized on all 10 knitting needles ×: Scratches and wear are observed on one or more knitting needles

Example 1
Segment A is obtained by using PET having a content of titanium oxide fine particles (TiO ₂ ) of 3% by mass as segment A, and using PET having a content of titanium oxide fine particles (TiO ₂ ) of 0.4% by mass as segment B. Using a nozzle having a mass ratio with respect to segment B (segment A / segment B) of 75/25 and having the cross-sectional shape (number of leaves: 8) in FIG. Was used to spin multifilaments at a spinning temperature of 295 ° C. Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. In addition, EC, DC, and the shortest distance between leaf portions adjacent to each other were measured and calculated using the 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 from the leaf was 0.7 μm.

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 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 contained in PET constituting the segment A was as shown in Table 1.

Example 4
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 and segment B was as shown in Table 1, respectively.

(Example 5)
As segment A, PET with a content of titanium oxide fine particles (TiO ₂ ) of 5% by mass is used as segment B, and PET with a content of titanium oxide fine particles (TiO ₂ ) of 0.4% by mass is used as segment B. Using a nozzle having a mass ratio with respect to segment B (segment A / segment B) of 75/25 and having the cross-sectional shape (number of leaves: 20) in FIG. Was used to spin multifilaments at a spinning temperature of 295 ° C. Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. In addition, EC, DC, and the shortest distance between leaf portions adjacent to each other were measured and calculated using the 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 from the leaf was 0.7 μm.

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 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)
The content of the titanium oxide fine particles contained in the PET constituting the segment A is set as shown in Table 1, the mixture ratio of the multifilament yarn constituting the knitted fabric is set to 30%, and 0.4 mass of titanium oxide is used as the fiber to be mixed. %, The same fineness as the multifilament yarn of Example 1 and the same number of filaments, except that knitting was performed using a PET multifilament yarn consisting of a single component, and a multifilament yarn and a knitted fabric were obtained. .

(Example 7)
As segment A, PET with a content of titanium oxide fine particles (TiO ₂ ) of 5% by mass is used as segment B, and PET with a content of titanium oxide fine particles (TiO ₂ ) of 0.4% by mass is used as segment B. Nozzle having a mass ratio with respect to segment B (segment A / segment B) of 75/25, the cross-sectional shape of FIG. 1 (h) (number of leaves: 8), and EC of 5% The multifilament was spun at a spinning temperature of 295 ° C. using a conventional compound spinning device. Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. In addition, EC, DC, and the shortest distance between leaf portions adjacent to each other were measured and calculated using the multifilament. As a result, EC was 5%, DC was judged as ◎ (DC was 5% or less in all leaves), and the shortest distance between adjacent leaves was 0.7 μm.

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 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 segment A, PET with a content of titanium oxide fine particles (TiO ₂ ) of 5% by mass is used as segment B, and PET with a content of titanium oxide fine particles (TiO ₂ ) of 0.4% by mass is used as segment B. The mass ratio with respect to segment B (segment A / segment B) is 75/25, the cross-sectional shape (number of leaf parts: 8) in FIG. A multifilament was spun at a spinning temperature of 295 ° C. using a conventional compound spinning device using a nozzle having a DC of more than 5% and not more than 10% in the leaf portion. Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. In addition, EC, DC, and the shortest distance between leaf portions adjacent to each other were measured and calculated using the 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 leaf portions adjacent to each other was 0.7 μm.

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 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)
As segment A, PET with a content of titanium oxide fine particles (TiO ₂ ) of 1.5% by mass is used, and as segment B, PET with a content of titanium oxide fine particles (TiO ₂ ) of 0.4% by mass is used. A mass ratio of A to segment B (segment A / segment B) is 75/25, and a nozzle having the cross-sectional shape (number of leaves: 4) in FIG. A multifilament was spun at a spinning temperature of 295 ° C. using a spinning device. Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. In addition, EC, DC, and the shortest distance between leaf portions adjacent to each other were measured and calculated using the 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 from the leaf was 0.7 μm.

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 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 2)
The same procedure as in Example 1 was conducted except that the content of titanium oxide fine particles contained in PET constituting the segment A was as shown in Table 1.

(Comparative Example 3)
As segment A, PET having a content of titanium oxide fine particles of 5% by mass was used, and as segment B, PET having a content of titanium oxide fine particles of 0.4% by mass was used. A mass ratio of segment A to segment B (segment A / segment B) is 75/25, and the cross-sectional shape with respect to the single yarn longitudinal direction is a composite shape shown in FIG. In place of the synthetic resin part 11 having a content of 5 to 30% by mass of the inorganic oxide fine particles shown in FIG. The filament was spun at a spinning temperature of 295 ° C. as a segment B made of PET having a titanium oxide fine particle content of 0.4 mass% instead of the synthetic resin part 12 not containing the inorganic oxide fine particles shown in FIG. Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. EC and DC were measured and calculated using the multifilament. 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 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 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 segment A, PET having a content of titanium oxide fine particles of 5% by mass was used, and as segment B, PET having a content of titanium oxide fine particles of 0.4% by mass was used. A mass ratio of segment A to segment B (segment A / segment B) is 75/25, and the cross-sectional shape with respect to the single yarn longitudinal direction is a composite shape shown in FIG. Instead of the portion 8 containing the inorganic oxide fine particles shown in (a) at a high concentration, the segment A made of PET having a titanium oxide fine particle content of 5 mass% is used, and the inorganic oxide fine particles shown in FIG. A multifilament was spun at a spinning temperature of 295 ° C. as a segment B made of PET in which the content of titanium oxide fine particles was 0.4 mass% instead of the portion 9 containing a low concentration. Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. EC and DC were measured and calculated using the multifilament. 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) Was 13.1%).

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 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 segment A, PET with a content of titanium oxide fine particles (TiO ₂ ) of 5% by mass is used as segment B, and PET with a content of titanium oxide fine particles (TiO ₂ ) of 0.4% by mass is used as segment B. Using a nozzle having the mass ratio with respect to segment B (segment A / segment B) of 75/25 and having the cross-sectional shape (number of leaves: 8) in FIG. 3, using a conventional compound spinning device The multifilament was spun at a spinning temperature of 295 ° C. Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. EC and DC were measured and calculated using the multifilament. As a result, 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 was 5% or less in all leaves).

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 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 6)
As segment A, PET with a content of titanium oxide fine particles (TiO ₂ ) of 5% by mass is used as segment B, and PET with a content of titanium oxide fine particles (TiO ₂ ) of 0.4% by mass is used as segment B. Nozzle having a mass ratio to segment B (segment A / segment B) of 75/25, the cross-sectional shape of FIG. 1 (h) (number of leaf portions: 8), and EC of 15% The multifilament was spun at a spinning temperature of 295 ° C. using a conventional compound spinning device. Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. In addition, EC, DC, and the shortest distance between leaf portions adjacent to each other were measured and calculated using the multifilament. As a result, EC was 15%, DC judgment was ◎ (DC was 5% or less in all leaf portions), and the shortest distance between the leaf portions adjacent to each other was 0.7 μm.

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 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)
As segment A, a PET having a content of titanium oxide fine particles (TiO ₂ ) of 5.0% by mass is used, and as a segment B, a PET having a content of titanium oxide fine particles (TiO ₂ ) of 0.4% by mass is used. A mass ratio of A to segment B (segment A / segment B) is 75/25, and a nozzle having the cross-sectional shape (number of leaves: 4) in FIG. A multifilament was spun at a spinning temperature of 295 ° C. using a spinning device. Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. In addition, EC, DC, and the shortest distance between leaf portions adjacent to each other were measured and calculated using the 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 from the leaf was 0.7 μm.

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 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)
As segment A, the content of titanium oxide fine particles is 5% by mass, and as the segment B, the content of titanium oxide fine particles is 0.4% by mass, and 5-sodium sulfoisophthalic acid (SIP-Na) is 2 Using PET obtained by copolymerization of polyethylene glycol (PEG) having a molecular weight of 5 mol% and an average molecular weight of 8000, the mass ratio of segment A to segment B (segment A / segment B) is 75/25. A multifilament was spun at a spinning temperature of 295 ° C. using a conventional composite spinning device using a nozzle whose cross-sectional shape with respect to the longitudinal direction of the yarn is as shown in FIG. 1 (h) (number of leaf portions: 8). Then, the spun multifilament is cooled and oiled, 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, and heat treated at a temperature of 140 ° C. A multifilament yarn having 48 yarns was obtained. In addition, EC, DC, and the shortest distance between leaf portions adjacent to each other were measured and calculated using the 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 from the leaf was 0.7 μm.

Using only the obtained multifilament yarn, a knitted fabric of 49 wal / 2.54 cm and 53 course / 2.54 cm was 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 divide the leaves of segment A, and then dyed at a temperature of 130 ° C. for 30 minutes according to the following formulation.
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, in Examples 1 to 8, the obtained knitted fabrics passed all of 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 7, when the content of the titanium oxide fine particles contained in the segment A was 5 to 8% by mass, the cool feeling and the see-through preventing effect when wet were particularly excellent. Further, in Example 2, the determination of DC was ◎ (DC is 5% or less in all leaves), whereas in Example 8, the determination of DC was ○ (DC was 5% in all leaves). 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 resistance when wet. It was a thing.

  On the other hand, in Comparative Example 1, since the content of the titanium oxide fine particles in the segment A was less than 2% by mass, the obtained knitted fabric did not satisfy the acceptance criteria for CT, UPF, and TF, and had a cool feeling and ultraviolet protection. It was inferior to the property and the prevention of see-through when wet.

  In Comparative Example 2, since the content of the titanium oxide fine particles in the segment A exceeded 10% by mass, the composite fiber could not be spun and a multifilament yarn and 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 operability of the multifilament yarn and the process passability in the yarn making process and the 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 a single yarn constituting the multifilament yarn is shown in FIG. 2 (a). In the cross-section of the single yarn constituting the multifilament yarn, 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 relative to the distance (μm) to the outer periphery of the single yarn was more than 10% (13.1%). From this, the area | region which sunlight can permeate | transmit in the segment B became large, and the obtained knitted fabric was inferior to coolness and the see-through prevention property at the time of wetness, CT and TF did not satisfy the acceptance criteria.

  In Comparative Example 5, as shown in FIG. 3, the cross-sectional shape of the segment A in the single yarn does not include a curved portion, and the sunlight incident on the segment A is less likely to cause diffuse reflection. From this, the obtained knitted fabric was inferior in see-through preventing property when wet because TF did not satisfy the acceptance criteria.

  Comparative Example 6 was obtained because the ratio (EC) of the length (μm) at which the outer periphery of the segment A was exposed to the surface of the single yarn with respect to the outer peripheral length (μm) of the single yarn exceeded 10%. Multifilament yarn was inferior in spinning operation and processability.

  In Comparative Example 7, since the number of leaf portions was less than 6, the obtained knitted fabric did not satisfy the acceptance criteria for CT, UPF, and TF, and had a cool feeling, an ultraviolet ray prevention property, and a see-through prevention property when wet. It became inferior to.

  In Reference Example 1, segment B was made of polyester, which is an easily soluble component, and after forming a knitted fabric, the segment B was dissolved and removed to divide the leaves. As a result, the obtained knitted fabric did not satisfy the acceptance criteria for CT, UPF, and TF, and was inferior in coolness, ultraviolet protection, and see-through prevention when wet.

DESCRIPTION OF SYMBOLS 1 Single yarn 2 Synthetic resin part 4 whose content rate X (mass%) of inorganic oxide fine particle is 2 <X <= 10 3 Synthetic resin part 4 whose content rate Y (mass%) of inorganic oxide microparticles is 2 mass% or less Leaf part 5 Part other than leaf part Hollow part 7 Concentric fiber 8 according to the prior art part 8 part containing inorganic oxide fine particles at high concentration 9 part containing no inorganic oxide fine particles 10 Such composite fiber 11 Synthetic resin part 12 having a content of inorganic oxide fine particles of 5 to 30% by mass. Synthetic resin part 13 not containing inorganic oxide fine particles 13 Styrofoam
14a, 14b holes
15a, 15b Woven knitted fabric 16a, 16b Thermocouple

Claims (9)

A multi-resin comprising a synthetic resin part having a content X (mass%) of inorganic oxide fine particles of 2 <X ≦ 10 and a synthetic resin part having a content Y (mass%) of inorganic oxide fine particles of 2% by mass or less. A filament yarn,
The multifilament yarn, wherein the cross-sectional shape with respect to the longitudinal direction of the single yarn constituting the multifilament yarn satisfies the following (1) to (4).
(1) The shape of the synthetic resin portion in which the content X (% by mass) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is radially directed from the center side to the outer peripheral side of the single yarn 6 to 20 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 where the content X (mass%) of the inorganic oxide fine particles is 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.   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 claim 1, 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 claim 1 or 2, 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 3.   The woven fabric according to claim 4, wherein the cover factor (CF) is 1000 to 3500.   The knitted fabric according to claim 4, wherein the cover factor (CF) is 500 to 2500.   The knitted or knitted fabric according to any one of claims 4 to 6, wherein the cooling property (CT) is 2.0 or more.   The woven or knitted fabric according to any one of claims 4 to 7, wherein the UV prevention index (UPF) is 30 or more. The woven or knitted fabric according to any one of claims 4 to 8, which has a permeability reduction degree (TF) represented by the following formula (I) of 8.0% or less.