JP6829005B2 - Tricot knitted fabric - Google Patents

Description

The present invention relates to a tricot knitted fabric having excellent lightness, UV protection, permeability when wet, and permeability when stretched.

Conventionally, it has been known to use a core-sheath type polyester composite fiber containing metal oxide fine particles in a core portion in order to obtain a fabric having excellent permeability or ultraviolet protection (for example, Patent Document 1). Further, in a knitted fabric used for clothing (for example, pants, outerwear, sports), it is required to have excellent stretchability and to be lightweight from the viewpoint of comfort. In addition, tricot knitted fabric is well known as a knitted fabric having excellent stretchability. The tricot knitted fabric is also excellent in shape stability or flexibility.

Japanese Unexamined Patent Publication No. 2014-70280

However, in the knitted fabric made of the composite fiber described in Patent Document 1, the permeability (permeability when wet due to sweating, etc., the permeability when stretched following the movement of the body, etc.) or UV protection Not enough sex. Here, if an attempt is made to increase the thickness or density of the knitted fabric to improve the transparency or the ultraviolet protection property, the weight becomes inferior. In addition, when a tricot structure is adopted as the knitting structure to improve stretchability, the lightness is inferior due to the dense structure caused by the interlacing of multiple loops or the double knitted fabric. There is. In addition, when a tricot structure is adopted, since the stretchability is very excellent, the knitted fabric becomes thin at the time of stretching and the voids of the stitches become large, so that the transparency and the ultraviolet protection are inferior. turn into.

The present invention solves the above-mentioned problems, and is excellent in all of transparency (translucency when wet and permeability when stretched), UV protection and light weight, and also excellent in stretchability. Providing land is a technical issue.

By using a multifilament yarn having a specific cross-sectional shape and a hollow portion and an elastic yarn as the fibers to be knitted, the present inventor is excellent in all of stretchability, permeability and ultraviolet protection, and further, thickness and knitting density. For the first time, we have found that a tricot knitted fabric having excellent lightness can be obtained even when the amount is increased, and the present invention has been reached. That is, the gist of the present invention is the following (I) to (IX).
(I) Including elastic yarn and multifilament yarn, the thickness is 0.3 mm or more and 1.5 mm or less , the knitting density is 40 to 110 course / 2.54 cm and 30 to 80 wales / 2.54 cm, and the basis weight is Is a tricot knitted fabric with a density of 100 to 600 g / m ² .
The multifilament yarn has a synthetic resin portion having an inorganic oxide fine particle content X (mass%) of 2 <X ≦ 10 and a synthetic resin portion having an inorganic oxide fine particle content Y (mass%) of 2 or less. Including
The cross-sectional shape of the single yarn constituting the multifilament yarn in the longitudinal direction satisfies the following (1) to (5) , and the tricot knitted fabric has a double denby structure, and when stretched, the following formula (a) A tricot knitted fabric characterized by having a transparency of 85% or more indicated by .
Transparency (%) = 100-[(L * value when a white plate is placed on the back side of the sample-L * value when a blackboard is placed on the back side of the sample) / (L * value of a white board-L of a blackboard) * Value) x 100] (a)
(1) The shape of the synthetic resin portion in which the content rate X (mass%) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is 6 to 30 radially extending from the center side to the outer peripheral side of the single yarn. Multi-leaf shape including individual leaves.
(2) The tip of the leaf on the outer peripheral side has a curved shape.
(3) The exposure length (μm) of the synthetic resin portion where the content ratio 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 of is 10% or less.
(4) The average ratio of the shortest distance (μm) from the outer circumference of the single yarn to the leaf portion with respect to the distance (μm) from the center of the single yarn to the outer circumference of the single yarn is 10% or less.
(5) The hollow ratio of the single yarn is 5 to 30%.

(II) The content of the synthetic resin constituting the synthetic resin portion in which the content X (mass%) of the inorganic oxide fine particles is 2 <X ≦ 10 and the content Y (mass%) of the inorganic oxide fine particles are 2 or less. The tricot knitted fabric of (I) in which the synthetic resin constituting a certain synthetic resin portion is polyester.

(III) A synthetic resin portion in which the content X (mass%) of the inorganic oxide fine particles is 2 <X ≦ 10 and a synthetic resin portion in which the content Y (mass%) of the inorganic oxide fine particles is 2 or less. (I) 1 is the tricot knitted fabric of (II) having a mass ratio of 30/70 to 90/10.

(IV) The tricot knitted fabric according to any one of (I) to (III), wherein the mixing ratio of the multifilament yarn is 5 to 95% by mass.

(V) The tricot knitted fabric according to any one of (I) to (IV), wherein the mixing ratio of the elastic yarn is 95 to 5% by mass.

(VI) The tricot knitted fabric according to any one of (I) to (V), wherein the elongation rate measured according to JIS L 1096: 2010 8.14 (constant velocity elongation method) is 60% or more.

(VII) A tricot knitted fabric according to any one of (I) to (VI), which has an ultraviolet protection index of 40 or more.

(IX) The tricot knitted fabric according to any one of (I) to (VII) , wherein the degree of decrease in permeability when wet, which is represented by the following formula (b), is 5% or less.
Degree of decrease in permeability (%) when wet = WId-WIw (b)
WId is the transparency of the sample when it is dried, and WIw is the transparency of the sample when it is wet. The dry sample is a sample adjusted for 24 hours in an environment of 20 ° C. 65% RH, and the wet sample is a sample adjusted for 24 hours in an environment of 20 ° C. 65% RH and has the same mass as the sample. It is a sample soaked with water.

Since the tricot knitted fabric of the present invention uses elastic yarn, it is remarkably excellent in stretchability in combination with the elasticity of the tricot structure. Since a multifilament yarn having a specific cross-sectional shape and a hollow portion is used as the knitting fiber, it is excellent in lightness even when the thickness is increased or the knitting density is increased, and when it is wet due to sweating or the like. It is possible to maintain excellent permeability even when the thickness is reduced or the gaps in the stitches are increased during stretching following the movement of the body.

It is a schematic diagram which shows an example of the cross-sectional shape with respect to the longitudinal direction in the single yarn which constitutes the multifilament yarn used for the tricot knitted fabric of this invention.

Hereinafter, the present invention will be described in detail.
The tricot knitted fabric of the present invention includes an elastic yarn and a multifilament yarn.

The multifilament yarn will be described below. The multifilament yarn has a synthetic resin portion (hereinafter, may be abbreviated as segment A) in which the content X (mass%) of the inorganic oxide fine particles is 2 <X ≦ 10, and the content Y (hereinafter, may be abbreviated as segment A) of the inorganic oxide fine particles. A synthetic resin portion (hereinafter, may be abbreviated as segment B) having a mass%) of 2 or less is included.

The synthetic resin constituting the segment A and the segment B may be any as long as it can be melt-spun, and is not particularly limited. Specifically, polyester typified by polyalkylene terephthalate such as polyethylene terephthalate (PET), polybutylene terephthalate, and polytrimethylene terephthalate, and polyamides represented by nylon 6, nylon 66, nylon 46, nylon 11 and nylon 12. Polyester represented by polypropylene and polyethylene, polychloride polymer represented by polyvinyl chloride and polyvinylidene chloride, polytetrafluoride ethylene and its copolymer, fluoropolymer represented by polyvinylidene fluoride, PLA (poly) Examples thereof include biomass polymers obtained by chemically polymerizing biomass-derived monomers such as (lactic acid), PTT (polyethylene terephthalate) and PBS (polybutylene succinate). Polyester and polyamide are preferable from the viewpoint of spinning operability, process passability and the like.

The synthetic resin constituting the segment A and the synthetic resin constituting the segment B are difficult to be peeled off due to physical impact or thermal impact received in the silk reeling process, the knitting process, etc., so that the combination has excellent compatibility. preferable.

Among the above synthetic resins, for example, polyester has aromatic dicarboxylic acids such as isophthalic acid and 5-sulfoisophthalic acid, adipic acid, succinic acid, suberic acid, and sebacic acid while considering melt viscosity, thermal properties, and compatibility. , 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 Hydrocarboxylic acids such as caproic acid, hydroxypentanoic acid, hydroxyheptanic acid and hydroxyoctanoic acid, aliphatic lactones such as ε-caprolactone and the like may be copolymerized.

As the inorganic oxide fine particles, those having a high sunlight shielding effect are preferable, and examples thereof include fine particles such as titanium oxide, calcium oxide, magnesium oxide, and zinc oxide. Of these, titanium oxide fine particles are preferable.

In the segment A, the content X (mass%) of the inorganic oxide fine particles needs to be 2 <X ≦ 10, preferably 3 ≦ X ≦ 8, and more preferably 5 ≦ X ≦ 8. By setting the content X to 2 <X ≦ 10, the spinning operability is improved, and by adopting a specific cross-sectional shape described later, UV protection and transparency during wetting and elongation are achieved. It becomes an excellent knitted fabric.

The segment B needs to have a content Y (mass%) of inorganic oxide fine particles of 2 or less, and 0 <Y ≦ from the viewpoint of compatibility between spinning operability and the effect of preventing see-through as a knitted fabric. 1 is preferable, and 0 <Y ≦ 0.5 is more preferable. By setting the content, the spinning operability of the multifilament yarn and the process passability in the silk reeling process and the knitting process are improved.

In addition to the inorganic oxide fine particles, the synthetic resin constituting segment A and the synthetic resin constituting segment B include stabilizers such as antioxidants, fluorescent agents, pigments, antibacterial agents, deodorants, and matting agents. Agents, fortifiers and the like may be added as long as the effects are not impaired.

The shape of the segment A in the cross section of the single yarn constituting the multifilament yarn in the longitudinal direction may be a multi-leaf shape including 6 to 30 leaves radially extending from the center side to the outer peripheral side of the single yarn. It is necessary and preferably has a multi-leaf shape containing 8 to 25 leaves.

The leaf portion as used in the present invention means a shape having a substantially rectangular shape, a substantially elliptical shape, a substantially trapezoidal shape, or the like and having at least one corner curved. Specifically, for example, the multifilament shown in FIG. It is exemplified by the cross-sectional shape (hereinafter, may be abbreviated as the composite shape of the present invention) with respect to the longitudinal direction of the single yarn constituting the yarn. The leaf portion does not have to be smooth on each side, for example, in a substantially rectangular shape, a substantially elliptical shape, a substantially trapezoidal shape, etc., for example, a leaf portion having a minute convex portion and / or a concave portion, or a wavy line. You may.

As illustrated in FIGS. 1 (a) to 1 (d), in the composite shape of the present invention, the segment A has a leaf portion radially extending from the center side to the outer peripheral side of the single yarn 1, and the leaf portion 4 has a leaf portion. , Separately present in segment B (eg, FIGS. 1 (a), (c) and (d)) or connected to each other in segment B (eg, FIG. 1 (b)). ). Further, of 6 to 30 leaves, a part may be connected and the rest may be separated by segment B. In such a case, the distance between adjacent leaves is 0.1 to 2. It is preferably 0 μm, more preferably 0.3 to 1.0 μm.

Since the shape of the segment A in the cross section of the multifilament yarn is a multi-leaf shape including 6 to 30 leaves radiating from the center side to the outer peripheral side of the single yarn, the leaf portions adjacent to each other are adjacent to each other. The interval between the two can be small. Further, preferably, by setting the interval to a specific value, the sunlight incident on one of the leaf portions and diffusely reflected is likely to be repeatedly diffusely reflected on the adjacent leaf portions, and the hollow portion described later will be described. Combined with the effect of providing the above, the tricot knitted fabric of the present invention has excellent permeability when wet or stretched.

In addition, the leaf portion needs to have a curved tip on the outer peripheral side. Since the tip portion has a curved shape, the tricot knitted fabric has excellent permeability when stretched and wet. It is presumed that this is because the sunlight incident on the multifilament yarn causes diffuse reflection at the tip of the curved leaf portion.

In the composite shape of the present invention, the single yarn constituting the multifilament yarn has a ratio (EC) of 10% or less of the exposure 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 is necessary that the content is 5% or less. By setting this ratio to 10% or less, the spinning operability and the process passability in the spinning process and the knitting process are improved.

The single yarn constituting the multifilament yarn is the shortest distance (μm) from the outer circumference of the single yarn to the leaf portion with respect to the distance (μm) from the center of the single yarn to the outer circumference of the single yarn in each leaf portion of the composite shape. The average ratio (DC) of the above needs to be 10% or less, and preferably 5% or less. When the average ratio exceeds 10%, the region sandwiched between the leaf portion and the outer circumference of the single yarn in the segment B region becomes large, and sunlight easily penetrates through the region. As a result, the amount of sunlight transmitted through the region is increased, so that the tricot knitted fabric containing such a multifilament yarn is inferior in UV protection and transparency during elongation and wetting.

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

The hollow ratio of the single yarn constituting the multifilament yarn needs to be 5 to 30%, preferably 10 to 20%. Further, the hollow portion is preferably arranged at the center of the single yarn from the viewpoint of spinning operability, uniform permeability, and the like.

The hollow ratio is measured by taking a cross-sectional photograph of a single thread cross section with an optical microscope (PCSCOPE PCS-81X manufactured by INABATA & CO) at a magnification of 10 to 20 times so that the single thread diameter in the photograph is 10 to 20 mm. The diameter of the single thread (μm), the length of the major axis of the hollow portion (μm), and the length of the minor axis of the hollow portion (μm) are measured. Then, it shall be calculated by the following formula (c).
Hollow ratio (%) = [(r1 ² + r2 ² ) / 2 × R ² ] × 100 (c)
r1: Length of the long axis of the hollow part (μm)
r2: Length of the minor axis of the hollow part (μm)
R: Single yarn diameter (μm)

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

The multifilament yarn has a conventional concentric composite fiber, a linear split fiber, and a hollow by providing a cross-sectional shape having the specific hollow portion in addition to the specific multi-leaf shape in the cross section described above. It is possible to obtain a tricot knitted fabric which is remarkably excellent in UV protection and transparency during elongation and wetting as compared with the case of using a composite fiber having no portion. This is because the refractive index of the air layer contained in the hollow portion and the refractive index of the segment A and / or the segment B are different from each other by further providing the hollow portion, so that the sunlight incident on the single yarn can be generated. It is presumed that this is due to the synergistic effect caused by refraction in the hollow portion.

If the hollow ratio is less than 5%, the hollow portion in the cross section of the single yarn is small, so that the effect due to the difference in refractive index between the air layer and the segment A and / or the segment B is not sufficiently exhibited, and the ultraviolet rays are not exhibited. It is inferior in preventability and permeability when stretched and wet. Further, if the ratio of the hollow portion exceeds 30%, the hollow portion disappears due to crushing in the silk reeling step or the post-processing step, and fibrillation or whitening occurs due to the peeling of the hollow portion, which is not preferable. Furthermore, if the hollow ratio is less than 5%, the tricot knitted fabric has excellent lightness even when the knitting density and thickness are increased in order to achieve sufficient transparency or UV protection. ..

In the composite shape, the shape of the segment A is preferably a rotationally symmetric shape. Here, the rotationally symmetric shape means a shape that overlaps with the original shape when rotated by a constant angle about the center point of the cross section of the single yarn. Since the shape of the segment A is rotationally symmetric, the single yarn spun from the spinning nozzle exhibits a so-called yarn bending phenomenon, which causes a problem that stable spinnability and good yarn quality cannot be obtained. It becomes difficult. In addition, the shielding property of the segment A, which contributes to the transparency, is less likely to be biased, and uniform transparency can be easily obtained at all angles.

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

When the mass ratio is 30/70 or more, the tricot knitted fabric using such a multifilament yarn is particularly excellent in UV protection and permeability during elongation and wetting. When the mass ratio is 90/10 or less, it becomes easy to improve the spinning operability, the process passability in the silk reeling process and the knitting process. When the mass ratio is 60/40 to 80/20, the spinning operability, the process passability in the silk reeling process and the knitting process are good, the ultraviolet ray protection property, and the transparency resistance at the time of elongation and wetness are improved. It is easy to make a particularly excellent tricot knitted fabric.

The single yarn fineness of the multifilament yarn is preferably 0.1 to 10 dtex, more preferably 0.5 to 5 dtex, because it is more excellent in balance of strength, permeability and the like. The number of single yarns of the multifilament yarn is preferably as large as possible for the purpose of enhancing the diffuse reflection effect of sunlight by the multifilament yarn, preferably 10 to 200 yarns, and more preferably 20 to 1000 yarns.

The multifilament yarn is a processed yarn that has been subjected to processing such as false twist processing, actual twist processing, loop processing, or interlacing processing as long as the effect of the present invention is not impaired such as disappearance of hollow portion or occurrence of peeling. May be.

The tricot knitted fabric of the present invention has excellent UV protection by containing the above-mentioned multifilament yarn, and further, when stretched to follow the movement of the body when worn, or when wet due to sweating or the like. , Excellent permeability can be exhibited.

In the tricot knitted fabric of the present invention, the mixing ratio of the multifilament yarn is preferably 5 to 95% by mass, more preferably 30 to 90% by mass, still more preferably 50 to 85% by mass. It is particularly preferably 50 to 70% by mass. When the content is 5% by mass or more, it becomes easy to ensure sufficient UV protection and transparency during elongation and wetting. When the content is 95% by mass or less, the elastic yarn described later can be sufficiently mixed, and the stretchability is improved.

The tricot knitted fabric of the present invention includes elastic yarns in order to exhibit stretchability and achieve a comfortable fit that follows the body. The elastic yarn is preferably a polyurethane fiber from the viewpoint of being more excellent in stretchability. The fineness of the elastic yarn is preferably 10 to 70 dtex in order to have excellent elasticity, further improve the density, and have excellent strength and the like.

In the tricot knitted fabric of the present invention, the mixing ratio of the elastic yarn is preferably 95 to 5% by mass, more preferably 10 to 50% by mass, and further preferably 15 to 40% by mass. When it is 5% by mass or more, more excellent stretchability can be exhibited. When the content is 95% by mass or less, the multifilament yarn, which is a constituent fiber, can be sufficiently mixed, and the ultraviolet protection and the permeability are further improved. The tricot knitted fabric of the present invention may contain yarns other than the above-mentioned multifilament yarn and elastic yarn, if necessary, as long as the effects of the present invention are not impaired.

By adopting a tricot structure, it is possible to obtain a dense, durable and stable knitted fabric as well as being excellent in elasticity and shape stability. Further, since it has a soft texture and excellent breathability, it can be suitably used for various purposes. However, the tricot structure usually uses a plurality of reeds, and the knitted fabric is inferior in lightness due to the fact that the plurality of loops are interlaced like a woven fabric or become a double knitted fabric. Here, when the knitted fabric is thinned or the knitting density is reduced in order to achieve lightness, sufficient transparency cannot be achieved. In the present invention, even when the thickness and knitting density of the knitted fabric are increased, since the multifilament yarn having a hollow portion is used, the tricot knitted fabric having remarkably excellent lightness can be obtained.

In addition, by using a tricot structure, other structures are adopted because the diffuse reflection effect of sunlight by the multifilament yarn is enhanced due to the intersection of multiple loops and the double knitted fabric configuration as described above. The transparency is better than that of the case where

In the present invention, the tricot structure is obtained from a plurality of reeds. This is because the tricot structure of a single reed is not practical because it does not become a dough or orchids are likely to occur. Examples of such a tricot organization include double denby, half, mesh, and double tricot.

Tricot knit fabric having a basis weight of the present invention is 600 g / ^{m 2} or less, preferably 500 g / ^{m 2} or less, more preferably 100~450g / ^{m 2,} is 150 to 350 g / ^{m 2} Is even more preferable. When it is 600 g / m ² or less, it is more excellent in lightness. Since the tricot knitted fabric of the present invention uses a multifilament yarn having a hollow portion, it is lightweight even when the knitting density and thickness are increased in order to achieve sufficient permeability or ultraviolet protection. Excellent. When the basis weight is 100 g / m ² or more, the strength and the permeability are further improved.

The thickness of the tricot knitted fabric of the present invention is 0.3 mm or more, preferably 0.3 to 1.5 mm, more preferably 0.5 to 1.2 mm, and 0.5 to 1.0 mm. Is more preferable. When it is 0.3 mm or more, it becomes more excellent in UV protection and permeability when stretched and wet. When it is 1.5 mm or less, it can be made more excellent in lightness. Since the tricot knitted fabric of the present invention uses a multifilament yarn having a hollow portion, it is excellent in lightness even if the thickness is increased.

In the tricot knitted fabric of the present invention, the knitting density is 40 courses / 2.54 cm or more and 30 wales / 2.54 cm or more, and 40 to 110 courses / 2.54 cm and 30 to 80 wales / 2.54 cm. Preferably, it is 40 to 100 courses / 2.54 cm and 35 to 75 wales / 2.54 cm, and particularly preferably 50 to 95 courses / 2.54 cm and 40 to 70 wales / 2.54 cm. When this range is satisfied, it becomes more excellent in UV protection, transparency when stretched and wet, and light weight. Since the tricot knitted fabric of the present invention uses a multifilament yarn having a hollow portion, it is excellent in lightness even if the knitting density is set high. The knitting density in the present invention refers to the knitted fabric after various processing.

In the tricot knitted fabric of the present invention, the ultraviolet protection index (UPF) is preferably 30 or more, more preferably 38 or more, and further preferably 40 or more. Here, the ultraviolet protection index (UPF) refers to the ultraviolet transmittance of 280 to 400 nm measured using a spectrophotometer in accordance with the Australian New Zealand standard (AS / NZS; 4399: 1996), taking into account a predetermined damage coefficient. It is to be calculated. The higher the value of UPF, the greater the UV shielding performance, and when the value of UPF is 30 or more, the grade becomes "Very good projection" or higher, and the effect of protecting the skin from ultraviolet rays and preventing damage is further enhanced, which is preferable. In order to increase the UPF, in addition to enhancing the sunlight shielding property of the multifilament yarn itself, for example, the mixing ratio of the multifilament yarn, the thickness of the tricot knitted fabric, and the knitting density can be made appropriate. ..

The tricot knitted fabric of the present invention preferably has a transparency represented by the following formula (a) of 85% or more, more preferably 88% or more, still more preferably 90% or more when stretched.
Transparency (%) = 100-[(L * value when a white plate is placed on the back side of the sample-L * value when a blackboard is placed on the back side of the sample) / (L * value of a white board-L of a blackboard) * Value) x 100] (a)
The term "stretched" in the present invention means a state in which at least 10% or more is stretched in either the vertical or horizontal direction. In particular, in the present invention, it is preferable to achieve the above-mentioned transparency when it is extended by 20% in any direction, and it is possible to achieve the above-mentioned transparency when it is extended by 30%. More preferred.

When the transparency during elongation is within the above range, in the tricot knitted fabric of the present invention, which is remarkably excellent in stretchability due to the use of the tricot structure and elastic threads, the knitted fabric follows the movement of the body. Even when it is stretched, it has excellent transparency, so that when it is used for women's clothing, for example, underwear and the like do not show through, making it comfortable. In the present invention, the above-mentioned transparency can be maintained even when elongated at a high level of, for example, an elongation rate of 30%.

In the tricot knitted fabric of the present invention, the degree of decrease in permeability when wet, which is represented by the following formula (b), is preferably 5% or less, more preferably 4% or less, and 3% or less. Is even more preferable.
Degree of decrease in permeability (%) when wet = WId-WIw (b)
WId is the transparency of the sample when it is dried, and WIw is the transparency of the sample when it is wet. The dry sample is a sample adjusted for 24 hours in an environment of 20 ° C. 65% RH, and the wet sample is a sample adjusted for 24 hours in an environment of 20 ° C. 65% RH and has the same mass as the sample. It is a sample soaked with water. The transparency is calculated by the above formula (a). When the degree of decrease in permeability when wet is within the above range, excellent permeability can be exhibited even when the knitted fabric gets wet due to sweating, rainfall, or the like.

In the tricot knitted fabric of the present invention, by using the multifilament yarn as described above, the degree of decrease in permeability during elongation and the degree of decrease in permeability during wet can be reduced.

In the tricot knitted fabric of the present invention, the elongation rate is 60% or more in any of the vertical and horizontal directions, which is measured according to JIS L 1096: 2010 8.14 (constant speed elongation method) in order to have excellent stretchability. Is more preferable, 120% or more is more preferable, and 150% or more is further preferable. The upper limit of the elongation rate is not particularly limited, but is preferably 200%, for example. In order to keep the elongation rate within the above range, for example, the mixing ratio of the elastic yarn can be adjusted.

The tricot knitted fabric of the present invention is excellent in lightness because a multifilament yarn having a hollow portion is used even when the knitting density and the thickness are increased in order to achieve sufficient permeability or ultraviolet protection. .. Further, in order to make the cross-sectional shape of the multifilament yarn specific, it is excellent in UV protection or transparency when wet and stretched. That is, since it is excellent in stretchability, light weight, transparency resistance, and ultraviolet protection, it can be suitably used for various clothing applications. In particular, by using a multifilament yarn having a hollow portion, even when it gets wet due to sweating or the like, or when it stretches according to the movement of the body and the knitting density and thickness are reduced, remarkably excellent transparency is obtained. It is suitable for women's clothing (eg, bottoms such as pants or skirts, or blouses) because it is maintained.

Hereinafter, the present invention will be described with reference to examples. However, the present invention is not limited to the following examples.

The measurement and evaluation in the following Examples and Comparative Examples were carried out by the following methods.
(1) Extreme viscosity [η]
The measurement was carried out by a conventional method under the condition of a temperature of 20 ° C. using an equimass mixture of phenol and ethane tetrachloride as a solvent.

(2) Ratio (EC) of the exposure 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.
The cross section of the single yarn taken out from the multifilament yarn in the longitudinal direction was observed with an optical microscope (PCSCOPE PCS-81X manufactured by INABATA & CO), and the outer circumference length (μm) of the single yarn and the exposure length (μm) of the segment A on the single yarn surface were observed. ) Was measured, and the ratio (EC (%)) to the outer circumference length (μm) of the single yarn was calculated by the following formula.
EC = exposure length of segment A (μm) / filament outer circumference length (μm) x 100 (%)

(3) The average ratio (DC) of the shortest distance (μm) from the outer circumference of the single yarn to the leaf portion with respect to the distance (μm) from the center of the single yarn to the outer circumference of the single yarn.
The cross section of the single yarn taken out from the multifilament yarn in the longitudinal direction was 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 the single yarn at each leaf. The shortest distance (μm) from the outer circumference of the thread to each leaf was measured. Then, the average ratio (DC (%)) of the shortest distance (μm) from the outer circumference of the single yarn to each leaf in each leaf was calculated by the following formula with respect to the distance (μm) from the center of the single yarn to the outer circumference of the single yarn. ..
DC = average value of the shortest distance from the outer circumference of the single yarn to each leaf (μm) / distance from the center of the single yarn to the outer circumference of the single yarn (μm) × 100 (%)

(4) Shortest distance (μm) between leaves adjacent to each other
A single yarn is taken out from the multifilament yarn, and the cross section of the taken out single yarn with respect to the longitudinal direction is observed with an optical microscope (PCSCOPE PCS-81X manufactured by INABATA & CO), and the shortest distance between the separated leaves and the adjacent leaves ( 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 rate Measured and calculated by the above method.

(7) UV protection index (UPF)
It was calculated according to the Australian New Zealand standard (AS / NZS; 4399: 1996), taking into account the predetermined damage coefficient for the ultraviolet transmittance of 280 to 400 nm measured using a spectrophotometer.

(8) Transparency when stretched Ultraviolet visible near infrared spectrophotometer (“UV-3100PC” manufactured by Shimadzu Corporation, measurement wavelength 380 to 780 nm) (Attachment: Integrating sphere accessory “ISR-3100” with an inner diameter of 60 mmφ) The L * value when the white plate is installed on the back side of the sample, the L * value when the blackboard is installed on the back side of the sample, the L * value of the white plate, and the L * value of the blackboard are calculated using the following formula. The transparency was calculated according to (a). Barium sulfate was used as the material for the white board (standard white board).
Transparency (%) = 100-[(L * value when a white plate is placed on the back side of the sample-L * value when a blackboard is placed on the back side of the sample) / (L * value of a white board-L of a blackboard) * Value) x 100]
In addition, according to JIS L 1096: 2010 8.14 (strip method), a sample in which the elongation rate was 10% for both vertical and horizontal, 20% for both vertical and horizontal, and 30% for both vertical and horizontal was subjected to measurement.

(9) Degree of decrease in permeability when wet The permeability (WId) of the sample when dry and the permeability (WIw) of the sample when wet were measured and calculated by the following formula (b). The dry sample is a sample adjusted for 24 hours in an environment of 20 ° C. and 65% RH, and the wet sample is a sample adjusted for 24 hours in an environment of 20 ° C. and 65% RH and has the same mass as the sample. It was assumed to be moistened. The transparency was measured according to the method of (8) above (that is, calculated by the notation (a) without stretching).
Degree of decrease in permeability (%) when wet = WId-WIw (b)

(10) Fineness of multifilament yarn JIS L 1096: 2010 8.99.1. Measured and calculated according to b.

(11) Knitting density of knitted fabric Measured and calculated according to JIS L 1096: 2010 8.6.2.

(12) Thickness of knitted fabric Measured and calculated using a precision thickness measuring instrument (manufactured by Ozaki Seisakusho Co., Ltd., "Peacock").

(13) Metsuke of knitted fabric Measured and calculated according to JIS L 1096 8.3.

(14) Elongation rate of knitted fabric Measured and calculated according to JIS L 1096: 2010 8.14 (constant speed extension method).

(Example 1)
As the synthetic resin constituting the segment A, PET having an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and titanium oxide fine particles (TiO2) were contained in an amount of 3% by mass as inorganic oxide fine particles. As the synthetic resin constituting the segment B, PET having an intrinsic viscosity of 0.65 was chipped by a conventional method and dried, and the titanium oxide fine particles (TiO2) were contained in an amount of 0.4% by mass.

Using the PET constituting the segment A and the segment B, the mass ratio of the segment A to the segment B (segment A / segment B) is 75/25, and the cross-sectional shape (leaf portion) of FIG. 1 (c) is shown. Multifilaments were spun at a spinning temperature of 295 ° C. using a conventional composite spinning apparatus using a nozzle (number: 20). Then, the spun multifilament is cooled, oiled, and taken up by a take-up roller at a speed of 3000 m / min, then stretched at a temperature of 90 ° C. and a stretching ratio of 1.50, and heat-treated at a temperature of 140 ° C. to appear. A multifilament yarn having a fineness of 84 dtex and 48 single yarns was obtained. The EC, DC, the shortest distance between the leaf portions adjacent to each other, and the hollow ratio were measured and calculated using the multifilament. As a result, EC was 0% (segment A was not confirmed to be exposed on the surface of the single yarn), DC was 8% or less, the shortest distance between adjacent leaves was 0.7 μm, and the hollow ratio. Was 15%.

The obtained multifilament yarn was used for the front reed, and the polyurethane elastic yarn 33dtex was used for the back reed to obtain a tricot knitted fabric having a double denby structure by a tricot knitting machine. Then, it was refined by a conventional method and dyed with the following formulation 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, it was finished and subjected to various evaluations. The knitting density after finishing was 56 wales / 2.54 cm and 91 courses / 2.54 cm. The evaluation results are shown in Table 1.

(Comparative Example 1)
In Example 1, instead of the multifilament yarn used for the front reed, a polyester multifilament having a round cross section having no hollow portion (titanium oxide content: 2% by mass, 84 dtex single yarn number 48) was used. The same operation as in Example 1 was carried out to obtain a tricot knitted fabric of Comparative Example 1. The knitting densities after finishing were 56 wales / 2.54 cm and 89 courses / 2.54 cm. The evaluation results of this knitted fabric are shown in Table 1.

(Comparative Example 2)
Using only the multifilament yarn obtained in Example 1, the same operation as in Example 1 was performed except that the knitted fabric had a smooth knitting structure with a circular knitting machine, and the knitted fabric of Comparative Example 2 was used. Got The knitting densities after finishing were 36 wales / 2.54 cm and 38 courses / 2.54 cm. The evaluation results of this knitted fabric are shown in Table 1.

The tricot knitted fabric of the present invention obtained in Example 1 was excellent in stretchability because it adopted a tricot structure and used elastic yarn. Since it uses a multifilament yarn with a hollow portion, it is excellent in lightness without reducing the knitting density and thickness, and is also excellent in both water permeability and UV protection when wet and stretched. Was there.

The knitted fabric obtained in Comparative Example 1 was inferior in permeability and ultraviolet protection when wet and stretched because it used a polyester multifilament having no hollow portion.

Since the knitted fabric obtained in Comparative Example 2 had a smooth structure instead of a tricot structure without using elastic yarn, it was inferior in stretchability (elongation rate was 27%), and was prevented from being stretched at an elongation rate of 30%. The transparency could not be measured.

1 Single yarn 2 Synthetic resin part where the content X (mass%) of the inorganic oxide fine particles is 2 <X ≦ 10 3 Synthetic resin part where the content Y (mass%) of the inorganic oxide fine particles is 2 or less 4 Leaves Part 5 Hollow part

Claims (8)

It contains elastic yarn and multifilament yarn, has a thickness of 0.3 mm or more and 1.5 mm or less , a knitting density of 40 to 110 courses / 2.54 cm and 30 to 80 wales / 2.54 cm, and a basis weight of 100 to 100. It is a tricot knitted fabric with a weight of 600 g / m ² .
The multifilament yarn has a synthetic resin portion having an inorganic oxide fine particle content X (mass%) of 2 <X ≦ 10 and a synthetic resin portion having an inorganic oxide fine particle content Y (mass%) of 2 or less. Including
The cross-sectional shape of the single yarn constituting the multifilament yarn in the longitudinal direction satisfies the following (1) to (5) , and the tricot knitted fabric has a double denby structure, and when stretched, the following formula (a) A tricot knitted fabric characterized by having a transparency of 85% or more indicated by .
Transparency (%) = 100-[(L * value when a white plate is placed on the back side of the sample-L * value when a blackboard is placed on the back side of the sample) / (L * value of a white board-L of a blackboard) * Value) x 100] (a)
(1) The shape of the synthetic resin portion in which the content rate X (mass%) of the inorganic oxide fine particles in the cross section is 2 <X ≦ 10 is 6 to 30 radially extending from the center side to the outer peripheral side of the single yarn. Multi-leaf shape including individual leaves.
(2) The tip of the leaf on the outer peripheral side has a curved shape.
(3) The exposure length (μm) of the synthetic resin portion where the content ratio 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 of is 10% or less.
(4) The average ratio of the shortest distance (μm) from the outer circumference of the single yarn to the leaf portion with respect to the distance (μm) from the center of the single yarn to the outer circumference of the single yarn is 10% or less.
(5) The hollow ratio of the single yarn is 5 to 30%. The synthetic resin constituting the synthetic resin portion in which the content X (mass%) of the inorganic oxide fine particles is 2 <X ≦ 10 and the synthetic resin in which the content Y (mass%) of the inorganic oxide fine particles is 2 or less. The tricot knitted fabric according to claim 1, wherein the synthetic resin constituting the part is polyester. The mass ratio of the synthetic resin portion in which the content of the inorganic oxide fine particles X (mass%) is 2 <X ≦ 10 and the synthetic resin portion in which the content Y (mass%) of the inorganic oxide fine particles is 2 or less. The tricot knitted fabric according to claim 1 or 2, wherein the amount is 30/70 to 90/10. The tricot knitted fabric according to any one of claims 1 to 3, wherein the mixing ratio of the multifilament yarn is 5 to 95% by mass. The tricot knitted fabric according to any one of claims 1 to 4, wherein the mixing ratio of the elastic yarn is 95 to 5% by mass. The tricot knitted fabric according to any one of claims 1 to 5, wherein the elongation rate measured according to JIS L 1096: 2010 8.14 (constant speed elongation method) is 60% or more. The tricot knitted fabric according to any one of claims 1 to 6, wherein the ultraviolet protection index is 40 or more. The tricot knitted fabric according to any one of claims 1 to 7 , wherein the degree of decrease in permeability when wet, which is represented by the following formula (b), is 5% or less.
Degree of decrease in permeability (%) when wet = WId-WIw (b)
WId is the transparency of the sample when it is dried, and WIw is the transparency of the sample when it is wet. The dry sample is a sample adjusted for 24 hours in an environment of 20 ° C. 65% RH, and the wet sample is a sample adjusted for 24 hours in an environment of 20 ° C. 65% RH and has the same mass as the sample. It is a sample soaked with water.