JP6538340B2 - Hollow multifilament yarn, false twist hollow multifilament yarn, and woven and knitted fabric - Google Patents

Description

  The present invention is a hollow multifilament which is excellent in spinnability, processability in spinning and weaving and knitting processes, and which is excellent in coolness, ultraviolet protection and wet permeation when wet and knitted. Yarn, and false twisted hollow multifilament yarn. Furthermore, the present invention relates to a woven or knitted fabric comprising the hollow multifilament yarn, or a woven or knitted fabric comprising the false twisted hollow multifilament yarn.

  Heretofore, filaments made of a synthetic resin containing inorganic oxide fine particles such as titanium oxide have been known as fibers for imparting to a woven or knitted fabric a cool sensitivity and an ability to prevent see-through. A woven or knitted fabric using the filament can enhance the sunlight shielding property, and a certain effect is obtained in the cool sensitivity and the light transmission preventing property.

  However, when the inorganic oxide fine particles are contained in a high concentration, the inorganic oxide fine particles are exposed on the surface of the filament. The exposed inorganic oxide fine particles cause the guide wear in the yarn production or weaving / knitting process, causing the problem of processability. 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. It can not be said.

  FIG. 2 is a schematic view showing an example of the cross-sectional shape of the composite fiber according to the prior art with respect to the longitudinal direction. As shown in FIG. 2 (a), it comprises a portion 7 containing inorganic oxide fine particles in a high concentration and a portion 8 not containing inorganic oxide fine particles, with the portion 7 as the core and the portion 8 as the sheath, Composite fibers 6 arranged concentrically are known. In the case of the composite fiber 6, the problem of processability does not occur, and the cool sensitivity and the effect of preventing see-through when woven and knitted are enhanced to some extent.

  Further, as shown in FIG. 2 (b), it is a composite fiber comprising 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 containing no inorganic oxide fine particles. A composite fiber 9 is known 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 (see, for example, Patent Document 1). ). 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.

Unexamined-Japanese-Patent No. 5-247723

  However, in the composite fiber 6 shown in FIG. 2 (a), since the composite shape is concentric, there are many regions through which sunlight passes through the portion 8 containing no inorganic oxide fine particles, and a sufficient effect can be obtained as well. It can not be said that Further, the composite fiber 9 shown in FIG. 2 (b) has a cool sensitivity and a see-through preventing effect limited to a certain extent. Therefore, in order to enhance the sunlight shielding effect of the composite fiber 9, it is necessary to increase the ratio of the synthetic resin portion 10, and accordingly the area of the synthetic resin portion 10 exposed on the surface of the composite fiber 9 also increases. As a result, the number of exposed inorganic oxide fine particles is increased, which causes problems in processability such as guide wear.

  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. Changes greatly.

  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. The technical object of the present invention is to provide a hollow multifilament yarn excellent in preventing property, a false twisted hollow multifilament yarn, and a woven or knitted fabric comprising the hollow multifilament yarn or the false twisted hollow 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, a hollow multifilament yarn in which the ability to prevent see-through when wet is particularly improved in the case of a woven or knitted fabric by making the cross-sectional shape of the fiber a specific cross-sectional shape such as having a certain hollow portion. For the first time, it has been found that the present invention is obtained Furthermore, the present inventors have found that a false-twisted hollow multifilament yarn formed by false-twisting such hollow multifilament yarn is further improved in the ability to prevent permeation when wet when it is made into a woven or knitted fabric, according to the present invention. I reached.
That is, the present invention provides the following (1) to (11) as the gist.

(1) The first resin portion in which the content X of the inorganic oxide fine particles (mass%) is 2 <X ≦ 10, and the content Y (mass%) of the inorganic oxide fine particles is 2 mass% or less A false-twist hollow multifilament yarn comprising two resin parts, wherein the inorganic oxide fine particles are at least one selected from fine particles of titanium oxide, calcium oxide, magnesium oxide, or zinc oxide,
A false twist hollow multifilament in which the crimp rate of the false twisted hollow multifilament yarn is 5 to 25% and the single yarn having the hollow rate of 3% or more is contained per 100 single yarns. yarn.
(2) The false twisted hollow multifilament yarn according to (1), wherein the synthetic resin constituting the first resin portion and the synthetic resin constituting the second resin portion are polyesters.
(3) Mass ratio of the first resin portion to the second resin portion (first resin portion / second resin portion)
The false twisted hollow multifilament yarn according to (1) or (2), wherein
( 4 ) A hollow multifilament yarn satisfying the following (i) to (v) is false-twist processed at a temperature of 150 to 200 ° C. and a false twist coefficient of 18,000 to 32,000 (1) to (3 ) The manufacturing method of the false twist hollow multifilament yarn in any one of these .
(I) A multi-leaf shape in which the shape of the first resin portion in the cross section includes 6 to 30 leaf portions radially extending from the center side to the outer peripheral side of the single yarn.
(Ii) The tip of the outer periphery of the leaf has a curved shape.
(Iii) The ratio of the exposed length (μm) of the first resin portion to the surface of the single yarn to the outer peripheral length (μm) of the single yarn is 10% or less.
(Iv) The average ratio 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 is 10% or less.
(V) The single yarn has a hollow portion, and the hollow ratio is 5 to 30%.
( 5 ) A woven or knitted fabric comprising the false twisted hollow multifilament yarn according to any one of (1) to ( 3 ).
( 6 ) The woven or knitted fabric according to ( 5 ), wherein the WI value is 15 or less.

  According to the hollow 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 transparency when wet Excellent in prevention. In addition, according to the woven or knitted fabric of the present invention, it is excellent in the coolness-sensitivity, the ultraviolet ray-preventing property and the see-through-preventing property when wet. In addition, a false-twisted hollow multifilament yarn formed by false-twisting a hollow multifilament yarn further improves the ability to prevent see-through when wet when it is made into a woven or knitted fabric. Therefore, the clothing made of this woven or knitted fabric can be used preferably for sports applications, summer shirts and the like because the occurrence of a large change in the feeling of transparency before and after perspiration can be significantly reduced.

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 hollow 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 hollow 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 fabric of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is an AA cross-section schematic diagram which shows the principal part of the apparatus which measures the cooling property (CT) of the woven 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 fabric of this invention. It is the photograph which image | photographed the cross section of the false twist hollow multifilament yarn of this invention.

  Hereinafter, the present invention will be described in detail.

  In the hollow multifilament yarn of the present invention, the resin portion (first resin portion) in which the content ratio X (mass%) of the inorganic oxide fine particles is 2 <X ≦ 10, and the content ratio Y (mass) of the inorganic oxide fine particles And a resin portion (second resin portion) having a%) of 2% by mass or less.

  In the present invention, the resins contained in the first resin part and the second resin part (respectively, the first resin and the second resin) may be those which are capable of melt spinning and are particularly limited. is not. Specifically, for example, polyester represented by polyalkylene terephthalate such as polyethylene terephthalate (PET), polybutylene terephthalate, or polytrimethylene terephthalate; represented by nylon 6, nylon 66, nylon 46, nylon 11 or nylon 12. Polyamides; polyolefins typified by polypropylene or polyethylene; polychlorinated polymers typified by polyvinyl chloride or polyvinylidene chloride; polytetrafluorinated ethylene and copolymers thereof or fluorine typified by polyvinylidene fluoride Biopolymers obtained by chemically polymerizing biomass-derived monomers such as PLA (polylactic acid), PTT (polytrimethylene terephthalate), or PBS (polybutylene succinate) And the like. From the viewpoint of spinning operability, processability and the like, polyester and polyamide are preferable.

  In the present invention, it is preferable that the first resin and the second resin be a combination having excellent compatibility. For example, when both the first resin and the second resin are polyesters, they tend to be excellent in compatibility. By combining the both in excellent compatibility, the first resin and the second resin are peeled off even when they receive physical impact or thermal impact in the spinning process or the weaving and knitting process. It becomes difficult. As described above, when both the first resin and the second resin are polyesters, when PET is used as both resins, the obtained hollow multifilament yarn peels off the first resin portion and the second resin portion. In addition to preventing, it is more preferable because it is excellent in thermal stability.

  Among the above-mentioned synthetic resins, for example, polyester, in consideration of melt viscosity, thermal properties and compatibility, aromatic dicarboxylic acids such as isophthalic acid or 5-sulfoisophthalic acid; adipic acid, succinic acid, suberic acid, Aliphatic dicarboxylic acids such as sebacic acid or dodecanedioic acid; aliphatic diols such as ethylene glycol, propylene glycol, 1,4-butanediol or 1,4-cyclohexanedimethanol; glycolic acid, hydroxybutyric acid, hydroxyvaleric acid And hydroxycarboxylic acids such as hydroxycaproic acid, hydroxypentanoic acid, hydroxyheptanoic acid, or hydroxyoctanoic acid; and aliphatic lactones such as ε-caprolactone.

  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 them, titanium oxide fine particles are preferable.

  In the first resin portion, the content X (mass%) of the inorganic oxide fine particles is required to satisfy 2 <X ≦ 10, preferably 3 ≦ X ≦ 8, and more preferably 5 ≦ X ≦ 8. By setting the content ratio X in the above range, the spinning operability becomes good, and in addition to the specific cross-sectional shape described later, when the hollow multifilament yarn of the present invention is made into a woven and knitted fabric, a cool feeling is obtained. It is excellent in the resistance, the ultraviolet ray-preventing property, and the see-through-preventing property when wet.

  In the second resin part, the content Y (mass%) of the inorganic oxide fine particles is required to be 2 mass% or less, and from the viewpoint of coexistence with the spinning operation and the like and the seepage preventing effect as a woven or knitted fabric. 0 <Y ≦ 1 is preferable, and 0 <Y ≦ 0.5 is more preferable. By making content rate Y into the said range, the hollow multifilament yarn of this invention becomes what has favorable process passability in spinning operation property, a yarn production process, and a weaving knitting process.

  In the first resin portion or the second resin portion, in addition to the inorganic oxide fine particles, a stabilizer such as an antioxidant, a fluorescent agent, a pigment, an antibacterial agent, a deodorant, a matting agent, or You may add a strengthening agent etc. in the range which does not impair the effect.

  The shape of the first resin portion in the cross section to the longitudinal direction of the single yarn constituting the hollow 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 It needs to be present, and it is preferable that it has a multileaf shape including 8 to 25 leaves.

  Here, the leaf portion in the present invention refers to one having a shape such as a substantially rectangular shape, a substantially elliptical shape, a substantially trapezoidal shape or the like in which at least one of the corners is a curve. It is illustrated in the cross-sectional shape with respect to the longitudinal direction of the single yarn which comprises a filament yarn (Hereinafter, it may be abbreviated as the composite shape of this invention.). The leaves do not have to be smooth, for example, each side such as a substantially rectangular shape, a substantially elliptical shape, or a substantially trapezoidal shape, and for example, a minute convex portion and / or a concave portion or a wavy line It may consist of

  Further, as illustrated in FIGS. 1 (a) to 1 (d), in the composite shape of the present invention, the first resin portion has a leaf portion radially directed from the center side of single yarn 1 to the outer peripheral side. The leaf parts 4 may be present separately in the second resin part (for example, as shown in FIGS. 1 (a), (c) and (d)), they are mutually connected in the second resin part (Eg, FIG. 1 (b)). Moreover, among 6-30 leaf parts, one part may be connected and the remainder may separate and exist by a 2nd resin part.

  As described above, when leaves are separated and present in the second resin as the first resin, the distance between the adjacent leaves is 0.1 to 2.0 μm. Preferably, it is 0.3 to 1.0 μm.

  In the hollow multifilament yarn of the present invention, since the shape of the first resin portion in the cross section 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, The distance between adjacent leaves can be made small. Furthermore, preferably, by setting the interval to a specific one, it is likely that the sunlight which has been incident on one of the leaf portions and diffused and reflected is further diffused and reflected again by the adjacent leaf portions, and the hollow portion described later It is speculated that the effect by providing them is excellent in the ability to prevent see-through when wet when combined with a woven or knitted fabric.

  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, in the case of a woven or knitted fabric, the effect of preventing seepage when wet becomes more excellent. It is presumed that such an effect is due to the fact that sunlight incident on the hollow multifilament causes diffuse reflection by the tip of the leaf portion having a curved shape.

  In a single yarn constituting the hollow multifilament yarn of the present invention, in the composite shape of the present invention, a ratio (EC) of the exposed length (μm) of the first resin portion to the surface of the single yarn to the outer peripheral length (μm) of the single yarn. Is required to be 10% or less, preferably 5% or less.

  By setting the ratio (EC) to 10% or less, the processability in the spinning operation, the spinning process and the weaving and knitting process becomes good.

  In the single yarn constituting the hollow multifilament yarn of the present invention, the shortest distance (μm) from the outer periphery of the single yarn to the leaf with respect to the distance (μm) from the center of the single yarn in each leaf of the composite shape to the outer periphery of the single yarn The average ratio (DC) of (1) needs to be 10% or less, preferably 5% or less.

  If the above average ratio (DC) exceeds 10%, the area between the leaf and the outer periphery of the single yarn in the area of the second resin part is large, and sunlight is easily transmitted through this area Become. As a result, the amount of sunlight passing through this region increases, so that the resulting hollow multifilament yarn becomes inferior in the coolness, the ultraviolet ray preventing property, and the moisture preventing property in the case of a woven or knitted fabric.

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

  Furthermore, the single yarn constituting the hollow multifilament yarn of the present invention has a hollow portion, and the hollow ratio thereof needs to be 5 to 30%, 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.

  In the present invention, the hollow rate can be measured as follows. Take a cross-sectional photograph of a hollow multifilament yarn or a single fiber cross section of a false-twist hollow multifilament yarn with an optical microscope at a magnification of 345. From the cross-sectional photograph, the entire area and the hollow area Measure and calculate the area of the hollow relative to the total area.

  The hollow ratio can be controlled within the above range by appropriately adjusting the spinning conditions such as the shape of the spinning nozzle, the viscosity of the synthetic resin, or the spinning temperature.

  The hollow multifilament yarn of the present invention is a conventional concentric composite fiber, linear, by providing a cross-sectional shape having a specific hollow portion in addition to the specific multilobal shape in cross-section as described above. In comparison with splittable fibers or composite fibers not provided with hollow portions, the coolness, the ultraviolet ray preventing property and the permeation preventing property when wet can be made particularly excellent in the case of a woven or knitted fabric. This is because the refractive index of the air layer contained in the hollow portion is different from the refractive index of the first resin portion and / or the second resin portion by further providing the hollow portion. It is speculated that this is due to a synergistic effect due to refraction of sunlight entering the yarn at the hollow portion.

  In addition, since the hollow part which occupies in the cross section of a single yarn is less than 5% of hollow ratio is small, the effect by the refractive index difference of an air layer and a 1st resin part and / or a 2nd resin part is enough. In the case of a woven or knitted fabric, it is inferior in the coolness, the ultraviolet ray-preventing property and the moisture-preventing property. In addition, if the ratio of the hollow portion exceeds 30%, it is not preferable because loss of the hollow portion due to crushing in the spinning process or the post-processing step or fibrillation or whitening due to peeling of the hollow portion is caused.

  In the composite shape of the present invention, the shape of the first resin portion is preferably rotationally symmetrical. Here, the rotationally symmetric shape refers to one that overlaps with the original shape when rotated at a constant angle about the center point of the single yarn cross section. Since the shape of the first resin portion is rotationally symmetric, the single yarn spun out from the spinning nozzle exhibits a so-called yarn bending phenomenon, and there is a problem that stable spinnability or good yarn quality can not be obtained. It becomes difficult to occur. In addition, it is difficult to cause an offset in the shielding property of the first resin portion that contributes to the light transmission preventing property, and it becomes easy to obtain uniform light transmission preventing property for all angles.

  The single yarn constituting the hollow multifilament yarn of the present invention has a mass ratio of the first resin portion to the second resin portion (first resin portion / second resin portion) of 30/70 to 90/10. Is preferably, and more preferably 60/40 to 80/20.

  When the mass ratio (first resin part / second resin part) is 30/70 or more, the hollow multifilament yarn of the present invention has a cool sensitivity, an ultraviolet ray preventing property, and a see-through property when wet. It is particularly excellent in the prevention. On the other hand, when the mass ratio is 90/10 or less, the processability in the spinning operation, the spinning process and the weaving and knitting process can be easily improved. When the mass ratio is 60/40 to 80/20, the hollow multifilament yarn of the present invention has good spinnability, processability in the spinning process and weaving / knitting process, and further, when it is made into a woven or knitted fabric It is more preferable because it becomes easy to be particularly excellent in the coolness, the ultraviolet ray-preventing property and the moisture permeation-preventing property.

  0.5-10 dtex is preferable, as for single yarn fineness of the hollow multifilament yarn of this invention, 0.8-5 dtex is more preferable, and 1-3 dtex is further more preferable.

  In the present invention, the number of single filaments of the hollow 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 hollow multifilament yarn of the present invention may be subjected to processing such as real twist processing, loop processing, interlace processing and the like within the range that does not impair the effects of the present invention.

  The false twisted hollow multifilament yarn of the present invention is obtained by performing false twisting on the above hollow multifilament yarn. In the false twist hollow multifilament yarn of the present invention, two or more single yarns having a hollow ratio of 3% or more are contained in 100 single yarns (that is, a single yarn having a hollow ratio of 3% or more) Present at a rate of 2% or more). In particular, it is preferable that eight or more single yarns having a hollow ratio of 3% or more are contained in 100 single yarns, more preferably 25 or more yarns, and still more preferably 30. It is particularly preferable to include more than one. The false twisted hollow multifilament yarn of the present invention is superior to the hollow multifilament yarn of the present invention in terms of anti-permeability. Further, it is more preferable that 10 or more single yarns having a hollow percentage of 5% or more are contained in 100 single yarns, still more preferably 15 or more yarns, and particularly preferably 10 or more yarns. . Furthermore, it is more preferable that a single yarn having a hollow ratio of 8% or more is contained in 100 single yarns, more preferably 10 or more, and particularly preferably 30 or more. preferable.

  The elongation of the false twisted hollow multifilament yarn of the present invention is preferably 10 to 50%, more preferably 15 to 40%, still more preferably 20 to 35%.

The crimp rate of the false twist hollow multifilament yarn of the present invention is preferably 5 to 65%, more preferably 10 to 55%, still more preferably 10 to 40%, and still more preferably 10 to 20%. % Is particularly preferred. The crimp rate is a numerical value calculated from the following equation (1).
Crimp rate (%) = (A0−A1) / A0 × 100 (1)
A1: After squeezing while applying a tension of 90.91 × 10 ^-3 cN / dtex to the yarn and treating it for 30 minutes with a load of 1.47 × 10 ^-4 cN / dtex applied to the skein, Skein length after leaving for 24 hours.
A0: The skein length when the load is changed from 1.46 × 10 ⁻³ cN / dtex to 4.4 × 10 ⁻² cN / dtex after A1 measurement.
The crimp rate can be adjusted by controlling the conditions (for example, heater temperature, overfeed rate, false twist coefficient) at the time of false twist processing.

  The woven or knitted fabric of the present invention is required to include the hollow multifilament yarn of the present invention or the false twist hollow multifilament yarn of the present invention. The woven or knitted fabric according to the present invention has excellent coolness and UV protection by comprising the hollow multifilament yarn of the present invention or the false twisted hollow multifilament yarn according to the present invention, and the woven or knitted fabric becomes wet due to sweating or the like. Even in the case where it has, it can have the outstanding shedding prevention property.

  The woven or knitted fabric (woven or knitted fabric 1) containing the hollow multifilament yarn or false twisted hollow multifilament yarn of the present invention preferably has a cooling property (CT) of 2.0 or more, and more preferably 2.5 or more. Preferably, it is 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 an essential part of a device for measuring the cooling property (CT) regarding the woven and knitted fabric 1. As shown in FIG. FIG. 5 is a schematic view of an A-A cross section, and FIG. 6 is a schematic view of a B-B cross section. As shown in FIGS. 4 and 5, in the measurement of CT, holes 13a and 13b (both 8 cm long, 8 cm wide and 0.7 cm deep) are juxtaposed on the upper surface side of the 20 cm high expanded polystyrene foam 12. The apparatus which provided thermocouple 15a, 15b in the center of the bottom part of hole 13a, 13b 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 polystyrene foam 12 so as to cover one of the holes 13a. As a woven or knitted fabric to be used as a blank, a single component having the same single fiber fineness, the same number of filaments, and the same structure as the multifilament yarn constituting the woven or knitted fabric to be measured, and containing 0.4% by mass of titanium oxide fine particles A woven or knitted fabric 14b consisting of PET multifilaments is used. In the same manner as the woven or knitted fabric 14a to be measured, the woven or knitted fabric 14b is attached so as to cover the other hole 13b. Then, as shown in FIG. 6, the apparatus is installed outdoors so that the surface to which the woven or knitted fabric is attached is directed horizontally. 15 minutes after installation, the temperature (T1 (° C.)) of the thermocouple 15a (provided in the hole 13a to which the woven or knitted fabric 14a to be measured is stuck) and the thermocouple 15b (woven or knitted fabric to be a blank) Measure the temperature (T2 (° C.)) of the hole 13b attached with 14b). Let the difference (T2-T1 (degreeC)) of each temperature be 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 95,000 to 105,000 lux.

  In the woven / knitted fabric of the present invention, in order to increase CT, for example, the shielding ability of sunlight of the hollow multifilament yarn (or false twisted hollow multifilament yarn) itself of the present invention itself is increased, or hollow multifilament yarn (or The mixed ratio of the false-twisted hollow multifilament yarn) or the cover factor of the woven or knitted fabric described later can be set in an appropriate range.

  In the woven or knitted fabric 1, it is preferable that the ultraviolet protection index (UPF) is 30 or more. Here, the ultraviolet protection index (UPF) is determined in consideration of a predetermined damage factor in the ultraviolet light transmittance of 280 to 400 nm measured using a spectrophotometer according to the Australian New Zealand Standard (AS / NZS; 4399: 1996). It is calculated.

  The higher the value of UPF, the higher the UV shielding performance. In particular, if the value of UPF is 30 or more, it becomes a grade of "Very good protection" or more, which protects the skin from ultraviolet light and is more effective in preventing damage. . In order to make the UPF of the woven or knitted fabric of the present invention high, the shielding properties of the hollow multifilament yarn (or false twist hollow multifilament yarn) itself against sunlight are enhanced, for example, the mixing ratio described below, or the cover factor. An appropriate range can be made.

  In the woven and knitted fabric 1, it is preferable that the degree of reduction in the permeability (TF, unit:%) represented by the following formula (I) is 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 whiteness using a spectrophotometer (for example, “MS-2020 type” manufactured by Macbeth Co., Ltd.). The dry sample is a sample obtained by adjusting the woven or knitted fabric for 24 hours in an environment of 20 ° C. and 65% RH. The wet sample is a sample in which the same mass of water as that of this sample is added to a sample prepared by adjusting the woven and knitted fabric for 24 Hrs under an environment of 20 ° C. and 65% RH.

  In order to lower the TF (%) of the woven or knitted fabric of the present invention, the hollow multifilament yarn (or false twisted hollow multifilament yarn) of the present invention itself is used as the hollow multifilament yarn (or false twisted hollow multifilament yarn). In the case where the woven or knitted fabric is used as a woven or knitted fabric, it is possible to enhance the ability to prevent see-through when wet, for example, to set the mixing ratio to be described later or the cover factor within an appropriate range.

  The woven and knitted fabric (woven and knitted fabric 2) containing the false-twisted hollow multifilament yarn of the present invention is compared with the woven and knitted fabric (woven and knitted fabric 1) containing the hollow multifilament yarn of the present invention not subjected to false twisting. It is excellent. The WI value of the woven or knitted fabric (woven fabric 2) containing the false twisted hollow multifilament yarn of the present invention is preferably 15 or less, more preferably 13 or less, still more preferably 11 or less, and 10 It is more preferably 0.5 or less, particularly preferably 10 or less. The WI value is an index of the gas permeation resistance, and the lower the value, the better the gas permeation resistance. In addition, how to obtain the WI value will be described later in the embodiment.

  In the woven or knitted fabric (woven or knitted fabric 1 or woven or knitted fabric 2) of the present invention, the mixing ratio of the hollow multifilament yarn of the present invention (or false twisted hollow filament yarn) is preferably 25% by mass or more, 30 It is more preferable that it is mass% or more, and it is further more preferable that it is 40 mass%. In order to sufficiently shield sunlight, it is desirable to set the mixing ratio to 100% by mass, but if it is 25% by mass or more, the cooling sensitivity, the ultraviolet ray preventing property and the moisture permeation preventing property tend to be good. . As a method of mixing the hollow multifilament yarn (or false twist hollow filament yarn) of the present invention, mixed fiber mixing, mixed spinning, twisting, cross-weaving, cross-knitting, etc. may be mentioned.

  When the woven or knitted fabric (woven or knitted fabric 1 or woven or knitted fabric 2) of the present invention is a woven fabric, the cover factor (CF) is preferably 1,000 to 3,500, and particularly preferably 1,500 to 2,500. When the woven or knitted fabric (woven or knitted fabric 1 or woven or knitted fabric 2) of the present invention is a knitted fabric, CF is preferably 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 calculated by the following formula (IV) in the case of a knitted fabric.

The abbreviations in the above formula indicate the following.
DT: Multifilament fineness (dtex)
WAD: warp density (book / 2.54 cm)
WED: Weft density (book / 2.54 cm)
CD: Course density (book / 2.54 cm)
WD: Wale density (book / 2.54 cm)

  The fineness of the multifilament yarn is, in the case of a woven fabric, JIS L 1096: 2010 89.9.1. According to method A of a, and in the case of knitting, JIS L 1096: 2010 8.9.9.1. Measured and calculated according to b. The warp density and weft density are measured and calculated according to JIS L 1096: 2010 8.6.1 A method, and the course density and wales density are calculated according to JIS L 1096: 2010 8.6.2

  When the cover factor of the woven or knitted fabric of the present invention satisfies the above range, this woven or knitted fabric is particularly excellent in coolness, ultraviolet ray-preventing property, and moisture-preventing ability to prevent penetration.

  The method for producing a false-twist hollow multifilament yarn according to the present invention performs the false-twist processing on the above-mentioned hollow multifilament yarn under a condition of a temperature of 150 to 200 ° C. and a false twist coefficient of 18,000 to 32,000. In particular, it is preferable to perform false twist processing under the condition of a false twist coefficient of 18,000 to 28,000. The temperature is preferably 160 to 190 ° C., and the false twist coefficient is preferably 20,000 to 26,000, more preferably 21,000 to 25,000, and still more preferably 21,000 to 24,000. Preferably, 21,500 to 23,000 are particularly preferred.

  The present inventors examined the false twisting process of the hollow multifilament yarn in order to further improve the vapor permeation resistance of the woven or knitted fabric, the conventional false twist conditions for imparting bulkiness to the hollow multifilament yarn of the present invention. It has been found that when false twisting is performed, the proportion of the hollow portion is reduced, and as a result, the gas permeation resistance becomes significantly inferior. Further, when the relation between the false twist condition and the hollow ratio in the false twist hollow multifilament yarn and the influence on the anti-permeability were examined in detail, contrary to the conventional findings, the shape of the hollow portion and the leaf portion In the case of a woven or knitted fabric containing a false twisted hollow multifilament yarn that has been false-twisted under moderate false-twisting conditions that are not normally used so as to be maintained, light reflection and refraction are effectively expressed, It turned out that it is remarkably excellent in the vapor barrier property. Although the reason why these phenomena appear is not clear, in a woven or knitted fabric containing a false-twisted hollow multifilament yarn, light reflection and air gaps between fibers based on the hollow and false-twist structure in the false-twisted hollow multifilament yarn are It is considered that the synergistic expression of the refraction makes it possible to obtain a woven or knitted fabric which is excellent in the gas permeation resistance.

  In the method for producing the false twist hollow multifilament yarn of the present invention, the other false twist processing conditions are not particularly limited as long as the effects of the present invention are not impaired. The stretching ratio is preferably 0.9 to 1.2, and more preferably 0.95 to 1.1. The twisting tension is preferably 1/20 to 1/5 (g) of the drawn fineness, and the twisting / twisting ratio represented by untwisting tension / twisting tension is preferably about 1.5 to 3.0 .

  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 (EC) of exposed length (μm) of the surface of the segment A to the outer peripheral length (μm) of a single yarn
The cross section with respect to the longitudinal direction of the single yarn taken out from the hollow multifilament yarn is observed with an optical microscope ("PCSCOPE PCS-81X" made by INABATA & CO), and the single yarn outer peripheral length (μm) and the exposure of segment A to the single yarn surface The length (μm) was measured, and the ratio (EC (%)) to the single yarn outer peripheral length (μm) was calculated by the following equation.
EC (%) = exposure length of segment A (μm) / filament 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 of the hollow multifilament yarn in the longitudinal direction is observed with an optical microscope ("PCSCOPE PCS-81X" manufactured by INABATA & CO), and the distance (μm) from the center of the single yarn to the outer circumference of the single yarn and each leaf The shortest distance (μm) from the single yarn outer circumference to each leaf in the part 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 center of the single yarn to the outer periphery of single yarn is calculated by the following equation did.
DC (%) = average value of shortest distance from single yarn outer circumference to each leaf (μm) / distance from center of single yarn to outer circumference of single yarn (μm) × 100
And it determined by the following references | standards, and made more than ○ the pass.
◎: DC is 5% or less.
○: DC is more than 5% and less than 10%.
X: DC exceeds 10%.

(4) The shortest distance between adjacent leaves (μm)
The single yarn is taken out of the hollow multifilament yarn, and the cross section of the single yarn taken out with respect to the longitudinal direction is observed with an optical microscope ("PCSCOPE PCS-81X" made by INABATA & CO) and the adjacent leaves in the separated leaves The shortest distance (μm) was measured. All the separated leaves in the cross section were measured, and the average value was taken as the shortest distance (μm) between the adjacent leaves.

(5) Hollow ratio Measured and calculated by the method described above.

(6) Cooling (CT)
As shown in FIGS. 4 and 5, holes 13a and 13b (each 8 cm long, 8 cm wide and 0.7 cm deep) are provided on the upper surface side of the 20 cm high foam polystyrene 12, and the bottom of the holes 13 a and 13 b The apparatus which provided thermocouple 15a, 15b in the center of 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 or knitted woven or knitted fabric 14a was attached to the upper surface of the polystyrene foam 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 single component having the same single yarn fineness, the same number of filaments, and the same structure as a multifilament yarn constituting the woven or knitted fabric to be measured. A woven or knitted fabric 14b made of PET multifilament yarn was used. In the same manner as the woven or knitted fabric 14a to be measured, the woven or knitted fabric 14b was attached so as to cover the other hole 13b. Then, as shown in FIG. 6, the apparatus was installed outdoors so that the surface on which the woven or knitted fabric was applied was directed horizontally. After installation, after 15 minutes, the temperature (T1 (° C.)) of the thermocouple 15a (provided in the hole 13a to which the woven or knitted fabric 14a to be measured is attached) and the thermocouple 15b (woven or knitted fabric 14b to be blank) And the temperature (T 2 (° C.)) of the provided hole 13 b) was measured. The difference between the respective temperatures (T2-T1 (° C.)) was taken as CT. The measurement was 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 100,000 lux. In the present invention, those having a CT of 2.0 or more were accepted.

(7) UV protection index (UPF)
According to Australian New Zealand Standard (AS / NZS; 4399: 1996), the ultraviolet ray transmittance measured at 280 to 400 nm using a spectrophotometer was calculated in consideration of a predetermined damage coefficient. In the present invention, those having a UPF of 30 or more were accepted.

(8) Degree of decrease in the degree of permeation (TF)
The whiteness (WId) of the dried sample and the whiteness (WIw) of the wet sample were measured using a spectrophotometer (manufactured by Macbeth, MS-2020), and calculated according to the following formula (I). In addition, the sample at the time of drying was a sample obtained by adjusting the woven and knitted fabric for 24 hours in an environment of 20 ° C. and 65% RH. The wet sample was a sample containing 24 mass of the same mass of water as a sample adjusted at 24 Hrs under an environment of 20 ° C. and 65% RH.

本発明においては、ＴＦが８．０以下のものを合格とした。

In the present invention, those having a TF of 8.0 or less were accepted.

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

ＤＴ：マルチフィラメント糸の繊度（ｄｔｅｘ）
ＣＤ：コース密度（本／２．５４ｃｍ）
ＷＤ：ウェール密度（本／２．５４ｃｍ）
なお、マルチフィラメント糸の繊度は、ＪＩＳ Ｌ １０９６：２０１０ ８．９．９．１．ｂに従い測定、算出した。また、コース密度、及びウェール密度は、ＪＩＳ Ｌ １０９６：２０１０ ８．６．２に従い測定、算出した。

DT: fineness of multifilament yarn (dtex)
CD: Course density (book / 2.54 cm)
WD: Wale density (book / 2.54 cm)
In addition, the fineness of the multifilament yarn is JIS L 1096: 2010 8.9.9.1. Measured and calculated according to b. Moreover, the course density and the wale density were measured and calculated according to 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 cutting threads (per weight) in operation. In the present invention, ○ was accepted.
○: 0 to 1 time Δ: 2 to 3 times ×: 4 or more times

(11) Process Passability Before knitting, among the knitting needles of the knitting machine, 10 needles without scratches or abrasion were randomly selected. The knitting needles selected after knitting were observed using an optical microscope, and the following evaluations were made.
○: no scratches or wear was observed on all 10 knitting needles.
X: One or more knitting needles are scratched or worn.

(12) WI value of woven or knitted fabric <WI value (anti-permeable)>
About difference of WI (Lab) when white board and blackboard are installed on back side of sample under measurement condition of 2 degrees of vision using Macbeth MS-2020 type spectrophotometer for woven fabric to be measured The color was measured with a wet sample (WIw) and a dry sample (WId), and the difference between them (WIw-WId) was defined as WI. The dry sample is a sample obtained by adjusting the woven or knitted fabric for 24 hours in an environment of 20 ° C. and 65% RH. The wet sample is a sample in which the same mass of water as that of this sample is added to a sample prepared by adjusting the woven and knitted fabric for 24 Hrs under an environment of 20 ° C. and 65% RH.

Example 1
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a proportion of 3% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. To this PET, titanium oxide fine particles (TiO ₂ ) were contained in a proportion of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (first resin part / second 1) using a nozzle having the cross-sectional shape of FIG. 1 (c) (the number of leaves: 20) using a conventional composite spinning apparatus at a spinning temperature of 295 ° C. The multifilament was spun out. Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn of 48 90 dtex single yarns. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and a hollow rate were measured and calculated using this multifilament yarn. As a result, EC was 0% (the first resin portion was not exposed on the surface of the single yarn), DC was judged as ◎ (DC of 5% or less in all leaves), adjacent to each other The shortest distance between the leaf and the leaf was 0.7 μm, and the hollow ratio was 15%.

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. After that, scouring was performed by a conventional method, and staining was performed at a temperature of 130 ° C. for 30 minutes according to the following formulation.
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 this knitted fabric.

(Examples 2 and 3)
Multifilament yarn and knitted fabric were obtained in the same manner as in Example 1 except that the content of titanium oxide fine particles in the first resin portion was changed as shown in Table 1.

(Example 4)
Multifilament yarn and knitted fabric were obtained in the same manner as in Example 1 except that the content of titanium oxide fine particles in the first resin part and the second resin part was changed as shown in Table 1, respectively.

(Example 5)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in an amount of 5% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. To this PET, titanium oxide fine particles (TiO ₂ ) were contained at a ratio of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (the first resin part / the second resin part) is used by using the first resin and the second resin PET containing titanium oxide fine particles. 1) using a nozzle having the cross-sectional shape (number of leaves: 8) shown in FIG. 1 (d), using a conventional composite spinning apparatus, using a multi-purpose spinning system at 295 ° C. The filament was spun out. Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn of 48 dts of 90 dtex single yarn. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and a hollow rate were measured and calculated using this multifilament yarn. As a result, EC was 0% (the first resin portion was not exposed on the surface of the single yarn), DC was judged as ◎ (DC of 5% or less in all leaves), adjacent to each other The shortest distance between the leaf and the leaf was 0.7 μm, and the hollow ratio was 15%.

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. After that, scouring was performed by a conventional method, and staining was performed at a temperature of 130 ° C. for 30 minutes according to the following formulation.
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 this knitted fabric.

(Example 6)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a ratio of 3% by mass. As a second synthetic resin, PET having an intrinsic viscosity of 0.65 was chipped by a conventional method and dried. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained at a ratio of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (the first resin part / the second resin part) is used by using the first resin and the second resin PET containing titanium oxide fine particles. The resin part is 75/25, the cross-sectional shape in FIG. 1 (c) (number of leaves: 20), and the hollow ratio is 23%, using a nozzle with a hollow ratio of 23%. The multifilaments were spun using a spinning temperature of 295 ° C. Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn of 48 90 dtex single yarns. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and a hollow rate were measured and calculated using this multifilament yarn. As a result, EC was 0% (the first resin portion was not exposed on the surface of the single yarn), DC was judged as ◎ (DC of 5% or less in all leaves), adjacent to each other The shortest distance between the leaf and the leaf was 0.5 μm, and the hollow ratio was 23%.

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. After that, scouring was performed by a conventional method, and staining was performed at a temperature of 130 ° C. for 30 minutes according to the following formulation.
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 this knitted fabric.

(Example 7)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a ratio of 3% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained at a ratio of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (the first resin part / the second resin part) is used by using the first resin and the second resin PET containing titanium oxide fine particles. Resin spinning is 75/25, and the cross-sectional shape in FIG. 1 (c) (the number of leaves: 20), and the ratio of the hollow portion is 8% The apparatus was used to spin multifilaments at a spinning temperature of 295 ° C. Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn of 48 90 dtex single yarns. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and a hollow rate were measured and calculated using this multifilament yarn. As a result, EC was 0% (the first resin portion was not exposed on the surface of the single yarn), DC was judged as ◎ (DC of 5% or less in all leaves), adjacent to each other The shortest distance between the leaf and the leaf was 0.3 μm, and the hollow ratio was 8%.

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. After that, scouring was performed by a conventional method, and staining was performed at a temperature of 130 ° C. for 30 minutes according to the following formulation.
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 this knitted fabric.

(Example 8)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a proportion of 5% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. To this PET, titanium oxide fine particles (TiO ₂ ) were contained in a proportion of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (the first resin part / the second resin part) is used by using the first resin and the second resin PET containing titanium oxide fine particles. Resin part) is 75/25, and it is a cross-sectional shape (the number of leaves: 20 pieces) of FIG. 1 (c), and EC is 5%. The multifilament was spun at a spinning temperature of 295.degree. Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn of 48 90 dtex single yarns. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and a hollow rate 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% The

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.

(Example 9)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a proportion of 5% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. To this PET, titanium oxide fine particles (TiO ₂ ) were contained in a proportion of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (the first resin part / the second resin part) is used by using the first resin and the second resin PET containing titanium oxide fine particles. Resin part) is 75/25, and it is a cross-sectional shape (the number of leaves: 20) of FIG. 1 (c), and the judgment of DC is ○ (DC exceeds 5% in all leaves) And multi-filaments were spun at a spinning temperature of 295 ° C. using a conventional composite spinning apparatus with a nozzle of 10% or less). Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn of 48 90 dtex single yarns. 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 first resin portion was not exposed on the surface of the single yarn), DC was evaluated as ○ (DC over 5% in all leaves, and 10 %, The shortest distance between adjacent leaves and the leaf was 0.7 μm, and the hollow ratio was 15%.

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. After that, scouring was performed by a conventional method, and staining was performed at a temperature of 130 ° C. for 30 minutes according to the following formulation.
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 this knitted fabric.

(Comparative example 1)
Multifilament yarn and knitted fabric were obtained in the same manner as in Example 1 except that the content of titanium oxide fine particles in the first resin portion was changed 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 first resin portion was changed as shown in Table 1.

(Comparative example 3)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a proportion of 5% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. To this PET, titanium oxide fine particles (TiO ₂ ) were contained in a proportion of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (first resin part / second resin part) is 75/25 using PET which is the first resin and the second resin. Synthetic resin whose content of inorganic oxide fine particles shown in FIG. 2 (b) is 5 to 30% by mass using a nozzle having a composite shape shown in FIG. 2 (b) with respect to the single yarn longitudinal direction. Instead of the part 10, the first resin part containing 5% by mass of titanium oxide fine particles and containing PET was used. And it replaces with the synthetic resin part 11 which does not contain the inorganic oxide fine particle shown in FIG.2 (b), and the content rate of a titanium oxide fine particle is 0.4 mass%, and is used regularly as a 2nd resin part containing PET. The multifilament was spun at a spinning temperature of 295 ° C. using a composite spinning apparatus of Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn of 48 90 dtex single yarns. In addition, EC and DC were measured and calculated using this multifilament yarn. As a result, EC was 15% and DC was evaluated as ◎ (DC not more than 5% in all leaves).

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. After that, scouring was performed by a conventional method, and staining was performed at a temperature of 130 ° C. for 30 minutes according to the following formulation.
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 this knitted fabric.

(Comparative example 4)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a proportion of 5% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained at a ratio of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (the first resin part / the second resin part) is used by using the first resin and the second resin PET containing titanium oxide fine particles. Resin part) is 75/25, and the composite shape in the cross section with respect to the single yarn longitudinal direction is a composite shape shown in FIG. 2 (a), and the inorganic oxide fine particles shown in FIG. The content of titanium oxide fine particles is 5% by mass instead of the portion 7 contained in concentration, and it is assumed that it contains PET, and is replaced with the portion 8 containing no inorganic oxide fine particles shown in FIG. The multifilament was spun at a spinning temperature of 295 ° C. using a conventional composite spinning apparatus as a second resin part containing 0.4% by mass of PET and containing PET. Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn of 48 dts of 90 dtex single yarn. EC and DC were measured and calculated using this multifilament yarn. As a result, EC is 0%, DC is determined as x (ratio of the distance from the outer periphery of the single yarn to the first resin portion (μm) to the distance from the center of the single yarn to the outer periphery of the single yarn (μm) %) Was 13.1%.

Using only the obtained multifilament, 49 wales / 2.54 cm, 53 courses / 2.54 cm knitted fabrics were obtained as a smooth texture by a circular knitting machine. After that, scouring was performed by a conventional method, and staining was performed at a temperature of 130 ° C. for 30 minutes according to the following formulation.
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 this knitted fabric.

(Comparative example 5)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a proportion of 5% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained at a ratio of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (the first resin part / the second resin part) is used by using the first resin and the second resin PET containing titanium oxide fine particles. Resin part is 75/25, and it is a cross-sectional shape (the number of leaves: 20) of FIG. 3 (a), and EC is 15%. The multifilament was spun at a spinning temperature of 295.degree. Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn having 48 90 dtex single yarns. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and a hollow rate were measured and calculated using this multifilament yarn. As a result, EC is 15%, DC judgment is ◎ (DC is 5% or less in all leaves), shortest distance between adjacent leaves is 0.7 μm, and hollow ratio is 15%. there were.

Using only the obtained multifilament, 49 wales / 2.54 cm, 53 courses / 2.54 cm knitted fabrics were obtained as a smooth texture by a circular knitting machine. Thereafter, the product was scoured by a conventional method and stained for 30 minutes at a temperature of 130 ° C. according to the following formulation.
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 titanium oxide fine particles in PET constituting the first resin portion is as shown in Table 1, and the same procedure is performed as in Example 1 except that a nozzle with an EC of 15% is used. I got a knit.

(Comparative example 6)
As a first synthetic resin, PET having an intrinsic viscosity of 0.65 was chipped by a conventional method and dried. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a ratio of 3% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained at a ratio of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (the first resin part / the second resin part) is used by using the first resin and the second resin PET containing titanium oxide fine particles. The resin part is 75/25, the cross-sectional shape in FIG. 1 (c) (number of leaves: 20), and the hollow ratio becomes 3%, using a nozzle with a hollow ratio of 3%. The multifilaments were spun using a spinning temperature of 295 ° C. Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn having 48 90 dtex single yarns. In addition, EC, DC, the shortest distance and the hollow ratio of the leaf part adjacent to each other, and a hollow rate were measured and calculated using this multifilament yarn. As a result, EC was 0% (the first resin portion was not exposed on the surface of the single yarn), DC was judged as ◎ (DC of 5% or less in all leaves), adjacent to each other The shortest distance between the leaf and the leaf was 0.3 μm, and the hollow ratio was 3%.

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. Thereafter, the product was scoured by a conventional method and stained for 30 minutes at a temperature of 130 ° C. according to the following formulation.
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 this knitted fabric.

(Comparative example 7)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a ratio of 3% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained at a ratio of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (the first resin part / the second resin part) is used by using the first resin and the second resin PET containing titanium oxide fine particles. The resin part is 75/25, the cross-sectional shape in FIG. 1 (c) (number of leaves: 20), and the hollow ratio becomes 40%, using a nozzle with a hollow ratio of 40%. The multifilaments were spun using a spinning temperature of 295 ° C.

(Comparative example 8)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles in a proportion of 5% by mass. As a second resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. To this PET, titanium oxide fine particles (TiO ₂ ) were contained at a ratio of 0.4% by mass.

  The mass ratio of the first resin part to the second resin part (the first resin part / the second resin part) is used by using the first resin and the second resin PET containing titanium oxide fine particles. The multifilament was spun at a spinning temperature of 295 ° C. using a nozzle having a resin part of 75/25 and the cross-sectional shape shown in FIG. 3B and using a conventional composite spinning apparatus. Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn of 48 dts of 90 dtex single yarn. 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 (ratio of distance from the outer periphery of the single yarn to the first resin portion (μm) to distance from the center of the single yarn to the outer periphery of the single yarn (μm) (%) 13.1%), hollow ratio was 15%.

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. Thereafter, the product was scoured by a conventional method and stained for 30 minutes at a temperature of 130 ° C. according to the following formulation.
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 this knitted fabric.

(Comparative example 9)
As a first resin, PET having an intrinsic viscosity of 0.65 was chipped and dried in a usual manner. Into this PET, titanium oxide fine particles (TiO ₂ ) were contained as inorganic oxide fine particles so as to be 3% by mass. As a second resin, a copolymer of 2.53% by weight of 5-sodium sulfoisophthalic acid (SIP-Na) and 13.3% by weight of polyethylene glycol (PEG) having an average molecular weight of 8000 was used. Polymerized PET (alkali-soluble polyester) was chipped and dried in a conventional manner.

  The mass ratio of the first resin portion to the second resin portion (the first resin, using the first resin PET and the second resin copolymerized PET and containing titanium oxide fine particles Part / second resin part) is 75/25, and using a nozzle having the cross-sectional shape (the number of leaves: 20) of FIG. 1 (c), using a commonly used composite spinning device, spinning The multifilament was spun at a temperature of 295 ° C. Then, the spun multifilament was cooled, an oil was applied to the surface, and it was pulled up with a take-up roller at a speed of 3000 m / min. Next, the film was drawn at a temperature of 90 ° C. and a draw ratio of 1.50, and heat-treated at a temperature of 140 ° C. to obtain a multifilament yarn of 48 90 dtex single yarns. In addition, EC, DC, and the hollow rate were measured and calculated using this 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 this knitted fabric. The knitted fabric was subjected to alkali treatment to elute the second resin portion, and the leaf portion of the first resin portion was divided, and then staining was performed for 30 minutes at a temperature of 130 ° C. according to the following formulation.
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 and TF were measured and calculated using this 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, it was a woven or knitted fabric having excellent coolness and ultraviolet ray-preventing properties and capable of having excellent transparency-preventing properties even when moistened with perspiration or the like. In particular, in Examples 2 to 5, when the content of the titanium oxide fine particles in the first resin portion was 5 to 8% by mass, the cool sensitivity and the effect of preventing permeation when wet were particularly excellent. In Example 2, the DC determination was の (DC of 5% or less in all leaves), whereas in Example 9, the DC determination was ○ (DC of 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 the coolness, the ultraviolet ray preventing property and the moisture preventing property when wet. It was a thing.

  On the other hand, in Comparative Example 1, since the content of titanium oxide fine particles in the first resin portion was less than 2% by mass, CT, UPF and TF of the obtained knitted fabric did not satisfy the acceptance criteria, and the cool sensitivity was obtained. And ultraviolet ray-preventing property and the ability to prevent moisture penetration.

  In Comparative Example 2, since the content of titanium oxide fine particles in the first resin portion was more than 10% by mass, it was not possible to spin a single yarn, and a multifilament yarn and a knitted fabric can be obtained. It was not.

  In Comparative Example 3, the cross-sectional shape of the single yarn constituting the multifilament yarn was as shown in FIG. 2 (b), so that the obtained multifilament yarn has a third for the outer peripheral length (μm) of the single yarn. The ratio (EC) of the exposed length (μm) of the single resin portion to the surface of single yarn exceeded 10%. From this, it became inferior to the spinning operativity of a multifilament yarn, and the process passability in a yarn production process and a knitting process. In addition, since the shape of the first resin portion is composed of only the straight portion not including the curvilinear portion, the obtained knitted fabric does not satisfy the pass criteria for TF and is inferior in the ability to prevent permeation when wet. Met.

  Comparative Example 4 shows the cross-sectional shape of the single yarn constituting the multifilament yarn in FIG. 2 (a), and in the cross section of the single yarn constituting the multifilament yarn, the single yarn from the center of the single yarn The ratio (%) of the distance (μm) from the outer periphery of the single yarn to the first resin portion with respect to the distance (μm) to the outer periphery of 1 was more than 10% (13.1%). From this, the area which can transmit sunlight in the second resin part becomes large, and the obtained knitted fabric does not satisfy the pass criteria for CT and TF, and is inferior in the coolness and the permeation preventing property when wet. there were.

  Comparative Example 5 was obtained because the ratio (EC) of the exposed length (μm) of the first resin portion on the surface of the single resin to the outer peripheral length (μm) of the single yarn exceeded 10%. The multifilament 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 or crushing of the hollow portion occurs in most of the single yarns constituting the multifilament yarn, and the spinning property is significantly deteriorated and stabilized. As a result, the multifilament yarn could not be spun and a knit could not be obtained.

  Comparative Example 8 is a core-sheath hollow single yarn in which the first resin portion does not contain a leaf portion, and the first resin portion is the first from the outer periphery of the single yarn 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) to the resin part was more 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 Comparative Example 9, the second resin was a polyester which is an alkali-soluble component, and the second resin portion was dissolved and removed from the knitted fabric to divide the leaf portion. Therefore, since the fibers constituting the obtained knitted fabric do not have hollow portions, CT and TF do not satisfy the acceptance criteria, and they are inferior in the coolness and the ability to prevent see-through when wet.

(Examples 10 to 13)
A hollow multifilament yarn was obtained in the same manner as in Example 2 except that the hollowness was changed to 5%. The obtained hollow multifilament yarn was subjected to false twisting processing under the conditions described in Table 2 to obtain false twisted hollow multifilament yarns of Examples 10 to 13.

Each false-twisted hollow multifilament yarn was disposed in a weft, and a polyester multifilament yarn (56 dtex / 24 filaments manufactured by UNITIKA CO., LTD.) Was disposed in a warp to obtain the woven fabric of Examples 10 to 13 (flat structure, Warp density: 150 yarns / 2.54 cm, weft yarn density: 70 yarns / 2.54 cm). In this woven fabric, the mixing ratio of false twisted hollow multifilament yarn was 58%. The woven fabric was scoured according to a conventional method and dyed at a temperature of 130 minutes for 30 minutes according to the following formulation.
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 woven fabric. The WI value was measured for each of these fabrics, and the measurement results are shown in Table 2.

(Examples 14 to 17)
The hollow multifilament yarn obtained in Example 2 was subjected to false twisting processing under the conditions described in Table 2 to obtain false twisted hollow multifilament yarns of Examples 14 to 17.

Each false-twisted hollow multifilament yarn was arranged as weft yarn, and polyester multifilament yarn (56 dtex / 24 filaments manufactured by Unitika Co., Ltd.) was arranged as warp yarn to obtain the woven fabric of Examples 14 to 17 (flat structure, Warp density: 150 yarns / 2.54 cm, weft yarn density: 70 yarns / 2.54 cm). In this woven fabric, the mixing ratio of false twisted hollow multifilament yarn was 58%. The woven fabric was scoured according to a conventional method and dyed at a temperature of 130 minutes for 30 minutes according to the following formulation.
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 woven fabric. The WI value was measured for each of these fabrics, and the measurement results are shown in Table 2.

(Comparative Examples 10 to 13)
A false twist hollow multifilament yarn was obtained in the same manner as in Example 2 except that the hollow ratio was changed to 5% and the TiO ₂ concentration of the first resin portion was changed to 2.0% by mass. The obtained false twisted hollow multifilament yarn was subjected to false twist processing under the conditions described in Table 3 to obtain false twisted hollow multifilament yarns of Comparative Examples 10 to 13.

Each false-twisted hollow multifilament yarn was arranged as weft yarn, and polyester multifilament yarn (56 dtex / 24 filaments manufactured by Unitika Co., Ltd.) was arranged as warp yarn to obtain the woven fabric of Comparative Examples 10 to 13 (flat structure, Warp density: 150 yarns / 2.54 cm, weft yarn density: 70 yarns / 2.54 cm). In this woven fabric, the mixing ratio of false twisted hollow multifilament yarn was 58%. The woven fabric was scoured according to a conventional method and dyed at a temperature of 130 minutes for 30 minutes according to the following formulation.
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 woven fabric. The WI value was measured for each of these fabrics, and the measurement results are shown in Table 3.

(Comparative Examples 14 to 17)
A hollow multifilamentary yarn was obtained in the same manner as in Example 2 except that the TiO ₂ concentration in the first resin portion was 2.0% by mass. The obtained hollow multifilament yarn was subjected to false twisting processing under the conditions described in Table 3 to obtain false twisted hollow multifilament yarns of Comparative Examples 14 to 17.

Each false-twisted hollow multifilament yarn was arranged as weft yarn, and polyester multifilament yarn (56 dtex / 24 filaments made by UNITIKA CO., LTD.) Was arranged as warp yarn to obtain the woven fabric of Comparative Examples 14 to 17 (flat structure, Warp density: 150 yarns / 2.54 cm, weft yarn density: 70 yarns / 2.54 cm). In this woven fabric, the mixing ratio of false twisted hollow multifilament yarn was 58%. The woven fabric was scoured according to a conventional method and dyed at a temperature of 130 minutes for 30 minutes according to the following formulation.
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 woven fabric. The WI value was measured for each of these fabrics, and the measurement results are shown in Table 3.

  As apparent from Table 2, the woven fabrics of Examples 10 to 17 consisting of the false-twisted hollow multifilament yarn of the present invention false-twisted so as to properly maintain the hollow portion were excellent in the anti-permeability. In particular, in Examples 13 to 15 in which the percentage of single yarns exhibiting a high hollow ratio is high, the vapor permeability was further excellent. In particular, the woven fabrics of Examples 11 to 13 and Examples 15 to 17 consisting of false-twisted hollow multifilament yarns in which the hollow portion and the leaf portion shape are maintained by false-twisting were excellent in the anti-permeability.

Further, as apparent from the results of Comparative Examples 10 to 17 in Table 3, the concentration of TiO _{2 in} the first resin portion is too low, which is suitable for hollow multifilament yarns not satisfying the constitution of the present invention. Even in the case of false twisting under the conditions, only false-twisted hollow multifilament yarns inferior in the vapor permeation resistance when formed into a woven or knitted fabric were obtained.

  FIG. 7 is a cross-sectional photograph of a false-twisted hollow multifilament yarn according to the present invention (hollow multifilament yarn containing 2 or more per 100 single yarns having a hollow ratio of 3% or more). (Magnification: 345 times). As apparent from FIG. 7, the false-twisted hollow multifilament yarn of the present invention which has been false-twisted under appropriate conditions maintains a sufficient hollow portion in each single yarn.

Reference Signs List 1 single yarn 2 first resin portion 3 second resin portion 4 leaf portion 5 hollow portion 6 composite fiber 7 concentrically arranged according to the prior art 7 portion 8 containing inorganic oxide fine particles in a high concentration inorganic oxidation Composite fiber 10 according to the prior art containing no fine particles Synthetic resin portion 11 containing 5 to 30% by mass of inorganic oxide fine particles Synthetic resin portion 12 containing no inorganic oxide fine particles 12 expanded polystyrene 13a, 13b Hole 14a , 14b woven and knitted fabric 15a, 15b thermocouple

Claims (6)

The first resin portion in which the content X of the inorganic oxide fine particles (mass%) is 2 <X ≦ 10, and the second resin in which the content Y of the inorganic oxide fine particles is 2 mass% or less A false-twisted hollow multifilament yarn comprising
The inorganic oxide fine particles are at least one selected from fine particles of titanium oxide, calcium oxide, magnesium oxide, or zinc oxide,
The crimp rate of the false twisted hollow multifilament yarn is 5 to 25%,
The false-twisted hollow multifilament yarn in which two or more single yarns each having 100% of the single yarns each having the hollow ratio of 3% or more are contained.   The false twisted hollow multifilament yarn according to claim 1, wherein the synthetic resin constituting the first resin portion and the synthetic resin constituting the second resin portion are polyesters.   The false twist according to claim 1 or 2, wherein a mass ratio of the first resin portion to the second resin portion (first resin portion / second resin portion) is 30/70 to 90/10. Hollow multifilament yarn. Following (1) to (5) a hollow multifilament yarn satisfies the temperature 150 to 200 ° C., and any of claims 1-3 for false twisting under the conditions of false twisting coefficient 18,000～32,000 1 The manufacturing method of the false twist hollow multifilament yarn as described in a term .
(1) A multi-leaf shape in which the shape of the first resin portion in the cross section includes 6 to 30 leaf portions radially extending from the center side to the outer peripheral side of the single yarn.
(2) The tip portion on the outer peripheral side of the leaf portion has a curved shape.
(3) The ratio of the exposed length (μm) of the first resin portion on the surface of the single yarn to the outer peripheral length (μm) of the single yarn 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 single yarn has a hollow portion, and the hollow rate is 5 to 30% A woven or knitted fabric comprising the false twisted hollow multifilament yarn according to any one of claims 1 to 3 . The woven or knitted fabric according to claim 5 , having a WI value of 15 or less.

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