JP2000282344A - Ultraviolet screening fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fabric suitable for clothes uses such as sportswear, umbrella fabrics, curtain fabrics, etc., excellent in ultraviolet screening properties, having a soft touch feeling and high air permeability and excellent even in refreshing properties. SOLUTION: This ultraviolet screening fabric comprises synthetic fibers with >=1.0 and <=6.0 wt.% content of inorganic oxide microparticles and/or core-sheath type synthetic fibers having a core part with >=3.0 and <=20.0 wt.% content of the inorganic oxide microparticles and a sheath part with <=2.0 wt.% content of the inorganic oxide microparticles. A woven or a knit fabric has >=0.5 and <=7% opening ratio and >=20 value of SPF defined by the formula [λdenotes the wavelength of ultraviolet rays; Eλdenotes a value of the reference erythematous effect; Sλdenotes a value of the reference solar radiation illuminance; Tλ denotes the ultraviolet transmittance (%) of the fabric and Δλdenotes the measured wavelength interval = 2 nm].

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to clothing, such as sports, innerwear and outerwear, and materials, such as umbrellas and curtains, which have an excellent ultraviolet shielding property, a soft texture, a high air permeability and an excellent refreshing property. Fabric.

[0002]

2. Description of the Related Art Conventionally, there have been proposed a large number of fabrics having enhanced ultraviolet shielding properties for the purpose of preventing sunburn, spots, skin cancer, and the like due to ultraviolet rays. For example, Japanese Unexamined Patent Publication No. 5-148734 discloses a fabric which contains an ultraviolet reflecting or absorbing agent, regulates the transmittance of ultraviolet A wave (320 to 400 μm) and ultraviolet B wave (290 to 320 μm), and maintains high air permeability. Has been proposed. In this prior art, ultraviolet A-waves and B-waves having different degrees of influence on sunburn and skin damage are divided, and the average transmittance of each is suppressed to a certain value or less, thereby enhancing the ultraviolet shielding property. However, in actual sunlight, ultraviolet rays A and B have different degrees of influence on sunburn and skin damage depending on the wavelength, so skin damage for each wavelength is taken into account only by the average transmittance of A and B waves. It is not a sufficient fabric to prevent actual sunburn.

Japanese Patent Application Laid-Open No. 61-146840 discloses a woven fabric in which the cover factor is specified to be equal to or more than a predetermined value. There was a drawback that the air permeability decreased and the refreshing feeling was poor.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to protect the skin from sunburn and spots due to ultraviolet rays, which have a soft texture, a high air permeability, and a refreshing feeling. It is to provide a fabric that can be made.

[0005]

Means for Solving the Problems The present inventors have used a cloth made of synthetic fibers containing inorganic oxide fine particles in a specific mode, and selectively specified the porosity and apparent density of the cloth. By controlling the UV transmission intensity of the skin, it is possible to protect the skin from sunburn and spots, etc., and also have a soft texture, high air permeability and a refreshing feeling, which can protect the skin from sunburn and spots. The inventors have found that they can be obtained and have reached the present invention.

The present invention provides a synthetic fiber having a content of inorganic oxide fine particles of 1.0% by weight or more and 6.0% by weight or less, and / or
Alternatively, the content of the inorganic oxide fine particles is 3.0% by weight or more 2
It is a fabric composed of a core-sheath type synthetic fiber having a core portion of not more than 0.0% by weight and a sheath portion having a content of inorganic oxide fine particles of not more than 2.0% by weight. 5% or more and 7%
The following is a fabric characterized by having an SPF value shown in the following formula (1) of 20 or more.

[0007] In the formula (1), λ is the wavelength of ultraviolet light, Eλ is the reference erythema effect value, Sλ is the reference solar irradiance value, Tλ is the ultraviolet transmittance (%) of the cloth, and Δλ is the measurement wavelength interval = 2 nm. .

The porosity referred to in the present invention indicates a substantial area ratio of through holes in a fabric. The aperture ratio of the cloth is defined by an optical microscope (magnification: 5 to 50).
Doubling the light from the back side of the woven or knitted fabric,
Take an enlarged photo where the aperture is white and the fiber is black,
The image of the photograph is taken into the computer by the CCD camera, the image taken by the image processing software is binarized into white and black by the hue difference, and the area ratio of the white (opening portion) in the whole area is calculated. The value obtained.

The SPF value referred to in the present invention is an index indicating how long a skin portion covered with a fabric product can be exposed to sunlight than uncovered skin.
For example, covering the skin with a woven or knitted product of SPF 20 means that it can be exposed to sunlight 20 times longer than bare skin. Here, the SPF is an ultraviolet shielding characteristic value in consideration of damage to the skin for each wavelength of ultraviolet light, and is calculated using the following equation (1).

[0010] (1) where λ is the wavelength of ultraviolet light, Eλ is the erythema effect value, S
λ is the solar irradiance value, Tλ is the ultraviolet transmittance (%) of the fabric
And Δλ represent the measurement wavelength interval = 2 nm, respectively.

Here, the erythema effect value (Eλ) is a value that has an effect on skin erythema for each ultraviolet wavelength shown in Table 1 (Food).
and Drug Administration,
“Sunscreen Drug Products
for Over-the-Counter Huma
n Use; Tententive Final Mon
ograph: Proposed Rule, Fede
ral Register vol 58, no. 90.
21 CFR Part 352 et al, 281
93-28302, mutatis mutandis). Reference solar irradiance value (W
/ Cm ² / mm) is represented by the actual solar irradiance in June shown in Table 2 (Sayre, Rl, Cole,
C. , Billhimer, W .; , Stanfield
d. , And Lee, R .; D. “Special
Comparison of Solar Simu
lators and Sunlight, “Photo
ordermatol. Photoimmunol ph
otomed. 7: 1.9-159 (1990).

Tλ is a transmittance value for each ultraviolet wavelength, which is measured by an ultraviolet spectrophotometer using a deuterium lamp as a light source in terms of the ultraviolet transmittance (%) of the cloth.

[0013]

[Table 1]

[0014]

[Table 2]

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. In the present invention, a fabric is formed by forming a woven fabric, a knitted fabric, and a short fiber or a filament fiber into a sheet to form a web, and bonding the web constituting fibers, entanglement, a nonwoven fabric formed by fixing by a stitch bond method, and the like. Refers to a laminated fabric.

In the present invention, it is important that the porosity of the fabric is 0.5% or more and 7% or less. When the porosity is 7% or less, the property of shielding ultraviolet B waves that cause a large damage to the skin becomes excellent. More preferably, the porosity is 5% or less. When the porosity exceeds 7%, even if a fabric is prepared using a fiber having a high content of inorganic oxide particles and a high ultraviolet shielding property, the shielding property of more harmful ultraviolet B waves is inferior, and the skin is protected. Becomes inadequate. The porosity of the fabric must be 0.5% or more. 0.5 porosity
%, The texture of the woven or knitted material becomes hard, and at the same time, the air permeability is reduced and the cooling property is poor.

The cloth used in the present invention has an opening ratio of 0.1.
If it is 5% or more and 7% or less, the structure of the woven or knitted material is not particularly limited, and may be a single layer, or may have a two-, three- or more-layer structure. When the fabric is a woven fabric, it can be arbitrarily used if it has a single layer, for example, plain weave, twill weave, satin weave, or the like, if it has two or more layers, such as a warp double weave, a weft double weave, or a multiple weave. If the fabric is a knitted fabric, if it is a single layer, weft knitting such as sheet knitting, rubber knitting or warp knitting of a single reed, if it has a structure of two or more layers, smooth, weft knitting such as punch Rome, Any warp knit with two or more reeds can be used arbitrarily. Stretch properties may be imparted by mixing with elastic fibers such as polyurethane.

Further, when the fabric of the present invention is a woven fabric,
The apparent density is 0.6cm^ThreeThe following is preferred.
More preferably, the apparent density is 0.5 cm^ThreeIt is as follows.
The apparent density is 0.6cm^ThreeExceeds the texture of the fabric,
Temper extremely decreased, it became hard and poor cooling
I will. If the fabric is a knit, the apparent density is 0.25 cm ^Three
The following is preferred. More preferably the apparent density
Is 0.2cm^ThreeIt is as follows. 0.25cm apparent density
^ThreeIf it exceeds 100, the texture and air permeability of the knit
It is inferior in coolness.

When the fabric is a nonwoven fabric, a nonwoven fabric structure adjusted to a predetermined aperture ratio by a dry method, a wet method, or a spun bond method may be formed. In the fabric of the present invention, the content of the inorganic oxide fine particles is 1.0% by weight to 6.0% by weight.
A core having a content of the following synthetic fibers and / or inorganic oxide fine particles of not less than 3.0% by weight and not more than 20.0% by weight; and a sheath having a content of inorganic oxide fine particles of not more than 2.0% by weight. It is necessary to be composed of a core-sheath type synthetic fiber having

As the synthetic fibers containing the inorganic oxide fine particles, for example, synthetic fibers such as polyester, polyamide, acrylic, polypropylene and polyurethane can be used. Synthetic fibers produced by melt spinning are preferred in the production process. The type of the inorganic oxide fine particles to be contained is not particularly limited as long as it does not hinder the production of the yarn, and for example, titanium oxide, zinc oxide, magnesium oxide, calcium carbonate, barium sulfate and the like can be used. These inorganic oxide fine particles can be used alone or in combination of two or more. Generally, the average particle size of the inorganic oxide fine particles used is preferably about 1 micron or less. Coarse particles of about 2 microns or more undesirably lead to yarn breakage during spinning. More preferably, it is 0.5 micron or less.

The content of the inorganic oxide fine particles is 1.0% in the case of a synthetic fiber having a single polymer composition which is not a core-sheath type.
It is necessary that the content is not less than 6% by weight and not more than 6.0% by weight.
If the content is less than 1.0% by weight, the shielding property against ultraviolet rays, particularly A wave, becomes inferior. If the content exceeds 6.0% by weight, the stability of the spinning process and the weaving / knitting processability are remarkably reduced. In the case of a core-sheath type synthetic fiber, the content of the inorganic oxide fine particles in the core portion needs to be 3.0% by weight or more and 20.0% by weight or less. If the content is less than 3.0% by weight, the shielding property against ultraviolet rays, particularly A wave, is inferior. If the content exceeds 20.0% by weight, it is difficult to uniformly disperse the fine particles and problems such as yarn breakage during spinning occur. The preferred content is 5% to 15% by weight.

In the case of the core-sheath type synthetic fiber, the core portion and the sheath portion may have the same polymer composition or different polymer compositions. For example, in the case of a polyester core-sheath type synthetic fiber,
Only the sheath may be a copolymerized polyester. Also,
In the case of a polyamide core-sheath type synthetic fiber, the core is made of nylon 66.
The sheath may be nylon 6. The core and the sheath may be combined concentrically or eccentrically. The weight ratio of the core component to the sheath component is 1/4
The range of ４4/1 is preferred. If the weight ratio of the core component is less than 1/4, the ultraviolet ray shielding effect is inferior, and if it exceeds 4/1, the core component is exposed to the surface of the filament during spinning, and a stable core-sheath shape becomes difficult. The preferred core-sheath ratio is 1/2 to 2/1, more preferably 1/1.

The cross-sectional shape of the synthetic fiber containing the inorganic oxide fine particles is not particularly limited, and may be a round shape, a triangular shape, a Y shape, an L shape, a W shape, a flat shape, a dog bone shape, a multi-leaf shape, or the like. Any shape may be used. The form of the fiber may be a long fiber or a short fiber, and may be uniform in the length direction or thick and thin. Further, the long fiber may be subjected to crimping such as false twisting, fluid jetting, twisting or the like.

The fineness of the synthetic fiber used in the present invention is not particularly limited, but considering that it is used for clothing, the total denier is preferably about 20 d to 300 d and the single yarn denier is about 0.5 d to 10 d. Range. In particular, in the case of a cloth for sports clothing that must be able to withstand severe conditions, 1d to 5d is more desirable,
In the case of an inner garment fabric that emphasizes soft touch and texture, 0.5d to 3d is more desirable.

In the fabric of the present invention, synthetic fibers containing inorganic oxide fine particles and other fibers may be mixed as long as the object of the present invention is not impaired. As the other fibers, synthetic fibers such as polyester, polyamide, polyurethane, and acrylic, and natural fibers such as cotton, hemp, and wool are preferably used, but any fiber can be used.

The blending method includes blending, air blending, twisting,
It can be mixed with yarn composite by means such as composite false twist (elongation difference false twist) or mixed by knitting or weaving. In the case of cross knitting or weaving, it can be used in at least one of the warp or weft, mixed alternately, alternately in two, or arranged in two or three layers. However, when mixed with other fibers, the weight ratio of the synthetic fibers containing the inorganic oxide fine particles is preferably 30% or more of the weight of the fabric in order not to lower the ultraviolet shielding property. It is more preferably at least 40%. Further, when the fabric is a woven or knitted structure, it is preferable that the woven or knitted structure is disposed on the woven or knitted fabric periodically, such as alternating one or two, or disposed on the entire surface of one layer of the woven or knitted fabric. .

Further, the fabric of the present invention preferably has an SPF value of 20 or more, more preferably 30 or more, and further preferably 50 or more. When the value of SPF is 20 or more, the effect of protecting the skin from ultraviolet rays is sufficient, but when the value of SPF is less than 20, damage to the skin such as sunburn becomes large.

[0028]

EXAMPLES The present invention will be described more specifically with reference to examples, but the present invention is not limited to the examples. In addition,
The properties and physical properties of the fabric in the practice were measured and evaluated using the following methods, and are shown in Table 3. (1) Measurement of Thickness The thickness (mm) of the woven or knitted fabric under a load of 5 g / cm ² is measured with a thickness gauge. (2) Measurement of apparent density It is calculated as follows from the relationship between the basis weight (g / m ² ) and the thickness (mm) of the woven or knitted fabric.

Apparent density (g / cm ² ) = weight (g / m ² )
² ) / Thickness (mm) / 1000 (3) Measurement of air permeability Air permeability (c) according to the JIS-L-1096 Frazier method
c / cm ² / sec). (4) Measurement of ultraviolet shielding properties The produced woven or knitted fabric was cut into a length of 4 cm × a width of 10 cm, and these were stuck to the left and right thighs at once, and the tennis sun was exposed to the sunlight for a total of 5 hours under the sunlight of August. Exposed,
The degree of sunburn was evaluated according to the following criteria. Table 3 summarizes the evaluation results.

◎: No change was observed in the skin at all ○: Almost no change was observed in the skin △: Slight redness was generated on the skin ×: Remarkably reddish was generated on the skin (5) Evaluation of texture The texture was organoleptically evaluated according to the following criteria.

：: Soft and good texture ×: Hard and poor texture [Example 1] A core comprising titanium oxide 8.0% by weight and a sheath containing titanium oxide 0.05% by weight, A plain woven fabric is manufactured using concentric polyester core-sheath type synthetic fibers (75 denier, 36 filaments) having a sheath weight ratio of 1/1 for the warp and the weft, and after scouring, heat setting is performed at 180 ° C. dry heat to obtain a warp density. 124 threads / inch, weft density 87 threads / inch, thickness 0.13 mm, basis weight 71 g /
A woven fabric having m ² and an apparent density of 0.55 g / cm ³ was obtained. The porosity of the woven fabric was 1.5%, and the SPF value was 150.
This fabric was a fabric that prevented sunburn due to ultraviolet rays, had a soft texture, and had high air permeability and excellent cooling properties.

Example 2 A concentric polyester having a core containing 8.0% by weight of titanium oxide and a sheath containing 0.05% by weight of titanium oxide and having a core / sheath weight ratio of 1/1. A plain woven fabric is produced using core-sheath type synthetic fibers (50 denier 36 filaments) for warp and weft, and scouring is performed.
%, And a dry heat setting at 180 ° C. was performed to obtain a warp density of 172 threads / inch, a weft density of 121 threads / inch, a thickness of 0.1 mm, a basis weight of 49 g / m ² , and an apparent density of 0.49 g / cm ^3. Was obtained. The woven fabric had an opening ratio of 4.0% and an SPF value of 50, and was a woven fabric that prevented sunburn due to ultraviolet rays, had a soft texture, had very high air permeability, and was excellent in refreshing property.

Example 3 A concentric polyester having a core containing 8.0% by weight of titanium oxide and a sheath containing 0.05% by weight of titanium oxide and having a core-to-sheath weight ratio of 1/1. A plain woven fabric was prepared using a core-sheath type synthetic fiber (75 denier 36 filaments) for the warp and a polyester round cross-section yarn (75 denier 36 filaments) containing 0.1% by weight of titanium oxide for the weft, and A similar scouring / dry heat setting was applied to obtain a warp density of 147 yarns / inch, a weft yarn density of 85 yarns / inch, a thickness of 0.13, and a basis weight of 73 g / inch.
A woven fabric having m ² and an apparent density of 0.56 g / cm ³ was obtained. The porosity of the woven fabric was 1.1%, and the SPF value was 31. This fabric prevents sunburn due to UV rays and has a soft texture,
In addition, the fabric was highly air-permeable and excellent in coolness.

Example 4 A concentric polyester having a core containing 8.0% by weight of titanium oxide and a sheath containing 0.05% by weight of titanium oxide and having a core / sheath weight ratio of 1/1. Example 1 A plain woven fabric was prepared by alternately using one core-sheath type synthetic fiber (75 denier 36 filaments) and one polyester fiber containing 0.1% by weight of titanium oxide (75 denier 36 filaments) for warp and weft. The same scouring / dry heat setting is applied, and the warp density is 124 yarns / inch.
Weft density 87 threads / inch, thickness 0.12mm, basis weight 67
g / m ² and an apparent density of 0.56 g / cm ³ were obtained. The porosity of the woven fabric was 1.3%, and the SPF value was 31. This woven fabric was able to prevent sunburn due to ultraviolet rays, had a soft texture, and had high air permeability and excellent cooling properties.

Example 5 Plain woven fabric was produced using polyester fibers containing 2.0% by weight of titanium oxide (36 filaments of 75 denier for warp and weft) and subjected to the same scouring / dry heat setting as in Example 1. , Warp density: 147 threads / inch, weft density: 85 threads / inch, thickness: 0.12, basis weight: 69
g / m ² and an apparent density of 0.58 g / cm ³ were obtained. The porosity of the woven fabric was 1.5%, and the SPF value was 98. This fabric was a fabric that prevented sunburn due to ultraviolet rays, had a soft texture, and had high air permeability and excellent cooling properties.

Example 6 A concentric polyester having a core containing 8.0% by weight of titanium oxide and a sheath containing 0.05% by weight of titanium oxide and having a core-to-sheath weight ratio of 1/1. A core-sheath type synthetic fiber (75 denier, 36 filaments) was spindle-rotated at 2 at a Mitsubishi LS-2 false twisting machine.
Using a yarn twisted at 50,000 rpm, 3200 T / m in number of twists, 200 ° C. for the first heater, and 190 ° C. for the second heater, fabricating a knitted fabric with a 28G single circular knitting machine, scouring and drying at 180 ° C. Heat set, 38 courses / inch, 37 wale / inch, thickness 0.78m
m, basis weight 130 g / m ² , apparent density 0.17 g / cm
³ knits were obtained. The opening ratio of the knitted fabric was 4.5%, and the SPF value was 31. The knitted fabric was able to prevent sunburn due to ultraviolet rays, had a soft texture, and had extremely high air permeability and excellent cooling properties.

COMPARATIVE EXAMPLE 1 A concentric polyester having a core containing 2.0% by weight of titanium oxide and a sheath containing 0.05% by weight of titanium oxide and having a core-to-sheath weight ratio of 1/1. A plain woven fabric is produced using core-sheath type synthetic fibers (75 denier, 36 filaments) for warp and weft, and after scouring,
Heat setting was performed at 80 ° C. dry heat to obtain a woven fabric having a warp density of 124 yarns / inch, a weft yarn density of 87 yarns / inch, a thickness of 0.13 mm, a basis weight of 68 g / m ² , and an apparent density of 0.52 g / cm ³ . The porosity of the woven fabric was 1.1%, and the SPF value was 19. Although this fabric has a soft texture and high air permeability, the effect of preventing sunburn due to ultraviolet rays was not sufficient.

[Comparative Example 2] Plain fabric was prepared using polyester fiber (75 denier, 36 filaments) for warp and weft containing 0.1% by weight of titanium oxide, and subjected to the same scouring / dry heat setting as in Example 1. A woven fabric having a warp density of 147 yarns / inch, a weft yarn density of 85 yarns / inch, a thickness of 0.12 mm, a basis weight of 71 g / m ² and an apparent density of 0.59 g / cm ³ was obtained. The SPF value was 18. Although the woven fabric had a soft texture and high air permeability, the effect of preventing sunburn by ultraviolet rays was not sufficient.

Comparative Example 3 Concentric polyester having a core containing 8.0% by weight of titanium oxide and a sheath containing 0.05% by weight of titanium oxide and having a core-to-sheath weight ratio of 1/1. A plain woven fabric is produced using core-sheath type synthetic fibers (50 denier 36 filaments) for warp and weft, and scouring is performed.
%, And a dry heat setting at 180 ° C. was applied to obtain a warp density of 172 threads / inch, a weft density of 121 threads / inch, a thickness of 0.08 mm, a basis weight of 36 g / m ² , and an apparent density of 0.45 g / cm ^3. Was obtained. The opening ratio of this fabric was 7.3%, and the SPF value was 17. Although this fabric has a soft texture and a very high air permeability, the effect of preventing sunburn by ultraviolet rays was not sufficient.

[Comparative Example 4] A concentric polyester having a core containing 8.0% by weight of titanium oxide and a sheath containing 0.05% by weight of titanium oxide and having a core / sheath weight ratio of 1/1. A plain woven fabric is produced using core-sheath type synthetic fibers (75 denier, 36 filaments) for warp and weft, and after scouring,
Heat setting was performed at 80 ° C. dry heat to obtain a woven fabric having a warp density of 143 yarns / inch, a weft yarn density of 103 yarns / inch, a thickness of 0.16 mm, a basis weight of 97 g / m ² , and an apparent density of 0.61 g / cm ³ . The porosity of the woven fabric is 0.4% and the SPF value is 19
It was 3. Although this fabric can prevent sunburn due to ultraviolet rays, it has a hard texture and low air permeability.

[Comparative Example 5] Polyester fiber (75 denier, 36 filaments) containing 0.1% by weight of titanium oxide was subjected to false twisting under the same conditions as in Example 6, and
A sheet of knitted fabric is produced using a 28G single circular knitting machine, and after scouring,
180 ° C dry heat setting, 36 courses / inch, 37
Wale / inch, thickness 0.76mm, basis weight 129g /
A knitted fabric having m ² and an apparent density of 0.17 g / cm ³ was obtained. The opening ratio of the knitted fabric was 4.9%, and the SPF value was 16.

Although the knitted fabric had a soft texture and extremely high air permeability, the knitted fabric was not sufficiently effective in preventing sunburn due to ultraviolet rays. [Comparative Example 6] A concentric polyester core-sheath type having a core portion containing 8.0% by weight of titanium oxide and a sheath portion containing 0.05% by weight of titanium oxide and having a core-sheath weight ratio of 1/1. Synthetic fiber (75 denier 36 filament yarn)
Using a 28G single circular knitting machine to make a knitted fabric,
After scouring, a dry heat set at 180 ° C. is applied, 34 courses / inch, 41 wales / inch, thickness 0.61 mm, basis weight 1
A knitted fabric having 20 g / m ² and an apparent density of 0.20 g / cm ³ was obtained. The opening ratio of the knitted fabric was 7.7%, and the SPF value was 14. This knitted fabric had a soft texture and extremely high air permeability, but was insufficient in the effect of preventing sunburn due to ultraviolet rays.

[Comparative Example 7] Using the same false-twisted yarn as in Example 6, a 28K single circular knitting machine was used to produce a knitted fabric.
After scouring, a 180 ° C dry heat set was applied, 58 courses / inch, 41 wale / inch, thickness 0.67 mm, basis weight 1
A knitted fabric having 75 g / m ² and an apparent density of 0.26 g / cm ³ was obtained. The opening ratio of the knitted fabric is 0.3% and the SPF value is 110.
Met. This knitted fabric could prevent sunburn due to ultraviolet rays, but had a hard texture and low air permeability.

[0044]

[Table 3]

[0045]

The fabric of the present invention can improve the shielding property of ultraviolet A-waves, and can also improve the shielding property of ultraviolet B-waves, which are harmful to the skin, and can significantly reduce skin damage due to ultraviolet rays. In addition, it has a soft texture, high air permeability, and excellent cooling properties.

Continued on the front page F term (reference) 4L002 AA07 AB02 AB05 AC00 BA01 DA01 EA00 EA02 FA01 FA06 4L041 BA02 BA05 BA21 BC06 BD14 BD20 CB05 CB25 CB28 DD23 4L048 AA20 AA28 AA42 AA56 AB07 AC01 BA01 BA02 CA15 DA01 DA03 DA01 DA

Claims (3)

[Claims] 1. A synthetic fiber having an inorganic oxide fine particle content of 1.0% by weight or more and 6.0% by weight or less, and / or an inorganic oxide fine particle content of 3.0% by weight or more and 20.0% by weight. %
A core-sheath type synthetic fiber having the following core portion and a sheath portion having an inorganic oxide fine particle content of 2.0% by weight or less, wherein the porosity of the fabric is 0.5% or more and 7% or less. % Or less, and the SPF value shown in the equation (1) is 20 or more. In the formula, λ represents the wavelength of ultraviolet light, Eλ represents the reference erythema effect value, Sλ represents the reference solar irradiance value, Tλ represents the ultraviolet transmittance (%) of the fabric, and Δλ represents the measurement wavelength interval = 2 nm. 2. The fabric according to claim 1, wherein the fabric is a woven fabric having an apparent density of 0.6 g / cm ³ or less. 3. The fabric has an apparent density of 0.25 g / cm ^3.
The fabric according to claim 1, which is a knitted fabric described below.