JP2000282345A - Ultraviolet screening fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fabric useful for sportswear, etc., having a soft touch feeling, high air permeability, high hygroscopicity and refreshing properties and excellent in ultraviolet screening properties. SOLUTION: This ultraviolet screening fabric is a fabric comprising synthetic fibers mixed with artificial cellulosic fibers and at least either one of the synthetic fibers and the artificial cellulosic fibers contains inorganic oxide microparticles. The fabric has >=0.3 and <=7% opening ratio thereof and <=20 value of SPF represented by the formula [λ denotes the wavelength of ultraviolet rays; Eλ denotes a value of the reference erythematous effect; Sλ denotes a value of the reference solar radiation illuminance; Tλ denotes the ultraviolet transmittance (%) of the fabric; Δλ denotes 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 relates to a fabric which is excellent in ultraviolet shielding properties, has a soft texture, and has high moisture absorption, high air permeability and excellent cooling properties, and is used for clothing such as sports, innerwear and outerwear. .

[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
Japanese Patent Application Publication No. -148734 proposes a fabric that contains an ultraviolet reflecting or absorbing agent, regulates the transmittance of ultraviolet A waves (320 to 400 μm) and ultraviolet B waves (290 to 320 μm), and maintains high air permeability. . 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, since the degree of influence on sunburn and skin damage is different for each wavelength among ultraviolet A-waves and B-waves, only the average transmittance of the A-waves and B-waves in this known fabric is required for each wavelength. No consideration is given to damage to the skin, and this known fabric is not sufficient to prevent actual sunburn.

Japanese Unexamined Patent Publication (Kokai) No. 61-146840 discloses a woven fabric in which the cover factor is set to a certain value or more. However, a fabric having a dense structure by increasing the cover factor has a drawback that the texture is hard and the air permeability is reduced, resulting in poor cooling. Furthermore, since these fabrics are composed mainly of synthetic fibers, they have poor hygroscopicity, and it is difficult to prevent a stuffy feeling when worn.

[0004] Although a method of applying an ultraviolet absorbent to cotton having high hygroscopicity by post-processing has been adopted, there was a drawback that durability was poor.

[0005]

The inventors of the present invention have conducted intensive studies on the above-mentioned problems, and have found that at least one of synthetic fibers and artificial cellulose fibers contains fine inorganic oxide particles, and these fibers are mixed. By setting the porosity and apparent density of the fabric to specific ranges, and by setting the SPF value to a certain value or more, the skin is protected from sunburn and spots due to ultraviolet rays, and the texture is still soft, and high moisture absorption and high The present inventors have found that a fabric having a good cooling property that can prevent a feeling of humidity by being breathable can be obtained, and reached the present invention.

[0006]

SUMMARY OF THE INVENTION The present invention is a fabric in which a synthetic fiber and an artificial cellulose fiber are mixed, wherein at least one of the synthetic fiber and the artificial cellulose fiber contains fine particles of inorganic oxide, and the porosity of the fabric is increased. Is not less than 0.3% and not more than 7%, and the SPF value shown in Formula 1 is not less than 20.

[0007] 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 cloth, and Δλ represents the measurement wavelength interval = 2 nm.

In the present invention, the porosity (%) indicates substantially the percentage of the area of the through-holes in the cloth, and is measured by an optical microscope (magnification: 5 to 50 times). In a state where light is applied from the back side of a knitted fabric or the like, an enlarged photograph is taken in which the aperture is white and the fiber is black, and the image of the photograph is taken as a CCD.
It is a value obtained by calculating the area ratio of white (opening) in the entire area after binarizing an image captured by a camera with a camera and capturing by an image processing software into white and black based on a hue difference. .

In the present invention, the ultraviolet shielding property of the fabric is SP
It is specified by the F value. The SPF in the present invention is an index indicating how long skin covered with a fabric product can be exposed to sunlight than uncovered skin. For example, covering the skin with a fabric product of SPF20 means that it can be exposed to sunlight 20 times longer than bare skin. The ultraviolet shielding property of the fabric represented by the SPF is a characteristic in consideration of damage to the skin for each wavelength of ultraviolet light, and is calculated by the following equation (1).

[0010] In the formula (1), 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 cloth, and Δλ represents the measurement wavelength interval = 2 nm.

Here, the reference erythema effect value (Eλ) is shown in Table 2.
(Food and value)
Drug Administration, “Suns
clean Drug Products for O
ver-the-Counter Human Us
e; Tententive Final Monogr
aph: Proposed Rule, "Feder
al Registervol 58, no. 90.21
CFR Part 352 et al, 28193
Adapted from -28302).

Reference solar irradiance value (W / cm ² / nm)
Is represented by the actual solar irradiance values for June shown in Table 2 (Sayre, R., M., Cole, C., Bill).
himer, W.C. , Stanfield, J .; , And
Ley, R .; D. “Special Compari
son of Solar Simulatorsan
d Sunlight, "Photodermato
l. Photoimmunol Photomed.
7: 159-165 (1990).

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

[0014]

[Table 1]

[0015]

[Table 2]

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
In the present invention, the fabric is a nonwoven fabric 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 constituent fibers by an adhesive, entanglement, or stitch bond method, and lamination of these. Refers to cloth.

In the present invention, it is important that the porosity of the fabric is 0.3% 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. If the porosity exceeds 7%, even if the 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 becomes inferior. Will be insufficiently protected. Further, when the porosity of the fabric is less than 0.3%, the texture of the fabric becomes hard, and at the same time, the air permeability is reduced and the cooling property is poor.

The fabric of the present invention is a fabric in which synthetic fibers and artificial cellulose fibers are mixed, and at least one of the synthetic fibers and the artificial cellulose fibers needs to contain inorganic oxide fine particles. The method of mixing may be any method. For one, they can be mixed by yarn composite, cross weaving, cross knitting and the like. In the case of yarn composite, for example, air mixing using a high-speed fluid injection nozzle, composite false twisting which is false twisted after air mixing, two types of fibers are supplied to the nozzle by overfeeding and fed to the nozzle to form a fine loop The composite may be formed by any means such as processing, twisting, and covering. In the case of cross-weaving and knitting, for example, in the case of a woven fabric, synthetic fibers and artificial cellulose fibers are arranged in warp and weft, respectively, and interwoven, or one or two synthetic fibers and artificial cellulose fibers are alternately alternated. And interweaving by arranging them on the warp and / or weft, or arranging them in two or three layers using a multiple loom and mixing them. In the case of knitted fabrics, synthetic fibers and artificial cellulose fibers are alternately knitted by a circular knitting machine or a flat knitting machine in an arrangement of alternating one or two, a lattice, a staggered arrangement, or a two-layer or three-layer arrangement. Or knitting with synthetic warp knitting machine by arranging synthetic fiber and artificial cellulose fiber on different reeds,
It is possible to mix them by arranging them alternately or alternately on the same reed and alternately knitting them. Further, in addition to the mixing of synthetic fibers and artificial cellulose fibers, the fibers may be mixed with other fibers such as natural fibers such as cotton, hemp, and wool at a mixing ratio of 30% by weight or less of the woven or knitted fabric.

However, in order to obtain good ultraviolet shielding properties, synthetic fibers and / or artificial cellulose fibers containing inorganic oxide fine particles are periodically arranged in a woven or knitted fabric such as alternately or alternately. Or it is preferably arranged on the entire surface of one layer of the woven or knitted fabric. Of the mixed methods, the yarn composite is preferable because the synthetic fiber can protect physical properties such as the strength and abrasion resistance of the artificial cellulose fiber, so that the processability of weaving, knitting and the like is improved.

When the fabric is a non-woven fabric, a synthetic fiber and an artificial cellulose fiber are mixed together as short fibers, and either a non-woven fabric formed by a dry or wet web or a synthetic fiber or an artificial cellulose fiber is spunbonded. Various non-woven fabrics such as a non-woven fabric having a structure formed of a web and laminated and compounded can be used. However, in order to obtain good ultraviolet shielding properties, a nonwoven fabric structure or a laminated structure in which synthetic fibers containing inorganic oxide fine particles and / or artificial cellulose fibers are uniformly distributed over the entire surface of the nonwoven fabric is preferred. preferable.

The mixing ratio of synthetic fibers and artificial cellulose fibers is 20% by weight or more of the weight of the fabric.
0% by weight or less, artificial cellulose fiber content is 20% by weight
It is preferable that the content be 70% by weight or less from the viewpoint of refreshing property derived from the moisture absorption property of the cloth, and strength, abrasion, washing resistance and other consumer properties. The fabric used in the present invention has an opening ratio of 0.1.
There is no particular limitation as long as it is 3% or more and 7% or less, and it may be a single layer, or may have a two-, three- or more-layer structure. In the case of a woven fabric, for example, a plain weave, a twill weave, a satin weave, or the like can be used arbitrarily if it has a single layer, and a warp double weave, a weft double weave, or a multiple weave can be used if it has two or more layers.
In the case of a knit, if it is a single layer, weft knitting such as sheet knitting, rubber knitting,
If the warp knitting of one reed is a structure having two or more layers, it can be used arbitrarily such as a weft knitting such as smooth and punched roma, or a warp knitting of two or more reeds. 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 preferably 0.65 cm ³ or less. More preferably, the apparent density is 0.5 cm ³ or less. If the apparent density exceeds 0.65 cm ³ , the texture and air permeability of the woven fabric will be extremely reduced, and the fabric will be hard and inferior in cooling. In the case of a knitted fabric, the apparent density is preferably 0.3 cm ³ or less. More preferably, the apparent density is 0.2
5 cm ³ or less. If the apparent density exceeds 0.3 cm ³ , the texture and air permeability of the knitted fabric will be extremely reduced, and the fabric will be hard and inferior in cooling.

It is necessary that at least one of the synthetic fibers and the artificial cellulose fibers used in the fabric of the present invention contains inorganic oxide fine particles. Examples of the synthetic fiber used in the present invention include polyester-based, polyamide-based, acrylic-based, polypropylene-based, and polyurethane-based fibers. Synthetic fibers produced by melt spinning such as polyester, polyamide, and polypropylene are preferable in the case of containing inorganic oxide fine particles.

On the other hand, the artificial cellulose fibers used in the present invention are basically made of β-glucose, such as artificially produced regenerated cellulose, purified cellulose fibers, and the like. Examples include rayon, acetate, polynosic, and lyocell. The type of the inorganic oxide fine particles to be contained in the fiber is not particularly limited as long as it does not hinder the production of the yarn. 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 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 in the synthetic fiber is preferably 1.0% by weight or more and 6.0% by weight or less in the case of a synthetic fiber having a single polymer composition which is not a core-sheath type. When the content is less than 1.0% by weight, the shielding property of ultraviolet rays, particularly A wave, is inferior. If the content exceeds 6.0% by weight, the stability of spinning and the processability of compounding, weaving and knitting will be significantly reduced. In the case of a core-sheath type synthetic fiber, the content of the inorganic oxide fine particles in the core is preferably from 3.0% by weight to 20.0% by weight. 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.
A more preferable content in the core portion is 5% by weight 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 content of the inorganic oxide fine particles in the artificial cellulose fiber is preferably 0.5% by weight or more and 5.0% by weight or less. More preferably, the content is 1.0% by weight or more and 5.0% by weight or less. When the content is less than 0.5% by weight, the shielding property of ultraviolet rays, especially A wave, becomes slightly inferior.
If the content exceeds 0% by weight, the stability of the spinning process and the processability of complex processing, for example, knitting and weaving, are remarkably reduced.

The cross-sectional shapes of the synthetic fibers and the artificial cellulose fibers are not particularly limited, and may be any of 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 and the like. It may be shaped. The form of the fibers may be long fibers or short fibers, and may be uniform in the length direction or thick and thin. The fineness of the synthetic fibers and the artificial cellulose fibers is not particularly limited. Considering use for clothing, total denier is 20d ~ 300
d, the single yarn denier is preferably in the range of about 0.5d to 10d. In particular, in the case of a cloth for sports clothing that must be able to withstand severe conditions, 1d to 5d is more preferable, and in the case of a cloth for inner clothing that emphasizes soft touch and texture, 0.5d to 3d is preferable. More desirable.

The fabric of the present invention must have an SPF value of 20 or more. The fabric of the present invention has an SPF value of 2
0 or more is required, 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 of the fabric is sufficient, but when the value of SPF is less than 20, damage to the skin such as sunburn becomes large.

[0030]

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 fabrics in the examples were measured and evaluated using the methods described below, and the results of the measurement and evaluation are shown in Table 3. (1) Measurement of thickness The thickness (m) of the cloth under a load of 5 g / cm ² was measured with a thickness gauge.
m) is measured. (2) Measurement of Apparent Density The apparent density was calculated from the relationship between the basis weight (g / m ² ) and the thickness (mm) of the cloth using the following equation.

Apparent density (g / cm ² ) = weight (g / m ² )
² ) / Thickness (mm) / 1000 (3) Measurement of air permeability, air permeability (c) according to JIS-L-1096 Frazier method
c / cm ² / sec). (4) Evaluation 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 in August for a total of 5 hours of sunlight. Exposed,
The degree of sunburn was evaluated according to the following criteria.

◎: No change was observed in the skin at all. ○: Almost no change was observed in the skin. Δ: Slight redness was generated on the skin. X: 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 (6) Measurement of hygroscopicity Absolute dry mass W of cloth brought to constant weight in a dryer at 105 ° C.
After measuring ₀ (g), the mass W ₁ (g) reached to a constant weight in an environment of 20 ° C. and 65% RH was measured, and the water content (%) was calculated by the following equation.

[0034] Example 1 Using a Mitsubishi LS-2 false twisting machine, a core portion containing 8.0% by weight of titanium oxide and a sheath portion containing 0.05% by weight of titanium oxide, and the weight ratio of the core to the sheath was 1/1. After interlacing the concentric polyester core-sheath type synthetic fibers (50 denier 36 filaments) and 50 denier 30 filaments copper ammonia method rayon containing 1.3% by weight of titanium oxide, the spindle speed was 250,000 rpm, False twisting was performed at a twist number of 2800 T / m and a first heater temperature of 180 ° C. to obtain a composite yarn.

A knitted fabric is produced from the composite yarn using a 32G single circular knitting machine. After scouring, a dry heat setting at 180 ° C. is performed to provide 74 courses / inch, 43 wales / inch, a thickness of 0.57 mm, and a basis weight of 137 g / g. m ² , apparent density 0.2
A knit of 4 g / cm ³ was obtained. The opening rate of this knitted fabric is 2.0%
And the SPF value was 34. This knitted fabric was a knitted fabric which prevented sunburn due to ultraviolet rays, had a soft texture, and had high air permeability and hygroscopicity and was excellent in coolness.

Example 2 A smooth knitted fabric was produced using a composite yarn similar to that of Example 1 using a 32G double circular knitting machine, and after scouring, a 180 ° C. dry heat setting was performed to obtain 37 courses / inch.
39 wale / inch, thickness 0.84 mm, weight 153
g / m ² and an apparent density of 0.18 g / cm ³ were obtained. The porosity of this knit was 4.8%, and the SPF value was 21. The resulting knitted fabric was a knitted fabric that prevented sunburn due to ultraviolet rays, had a soft texture, and had high air permeability and hygroscopicity and was excellent in refreshing properties.

Example 3 Using a Mitsubishi LS-2 false twister
Concentric polyester core-sheath type synthetic fiber (50 denier) comprising 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-to-sheath weight ratio of 1/1. 36 filaments) and 50 denier 20
After interlacing the filament viscose rayon, the spindle speed is 250,000 rpm and the twist number is 2800
False twisting was performed at T / m and a first heater temperature of 180 ° C. to obtain a composite yarn.

A knitted fabric is produced from the composite yarn using a 32G single circular knitting machine, and after scouring, subjected to a dry heat setting at 180 ° C., 74 courses / inch, 43 wales / inch, a thickness of 0.58 mm, and a basis weight of 135 g / m ² , apparent density 0.2
A knit of ³ g / cm ³ was obtained. The opening rate of this knitted fabric is 2.1%
And the SPF value was 25. This knitted fabric was a knitted fabric that prevented sunburn due to ultraviolet rays, had a soft texture, and had high air permeability and hygroscopicity and was excellent in coolness.

Example 4 A Mitsubishi LS-2 false twister
Concentric polyester core-sheath type synthetic fiber (75 denier) consisting of a core containing 8.0% by weight of titanium oxide and a sheath containing 0.05% by weight of titanium oxide having a core-to-sheath weight ratio of 1/1. 36 filaments) and titanium oxide.
A 30-denier 18-filament copper-ammonia rayon containing 3% by weight was interlaced and then false-twisted at a spindle rotation speed of 250,000 rpm, a twist number of 2800 T / m, and a first heater temperature of 180 ° C. to obtain a composite yarn.

A knitted fabric is produced from this composite yarn using a 32G single circular knitting machine. After scouring, a 180 ° C. dry heat setting is applied, 75 courses / inch, 43 wales / inch, thickness 0.59 mm, basis weight 138 g / inch. m ² , apparent density 0.2
A knit of ³ g / cm ³ was obtained. The opening rate of this knitted fabric is 1.9%
And the SPF value was 36. This knitted fabric prevented sunburn due to ultraviolet rays, had a soft texture, and had high air permeability, high moisture absorption, and excellent cooling properties.

Example 5 A plain woven fabric was prepared by using the same composite yarn as in Example 1 for warp and weft, and after scouring, subjected to a dry heat setting at 180 ° C. to give a warp density of 103 yarns / inch and a weft density of 70 yarns. / Inch, thickness 0.18mm, basis weight 76g /
A woven fabric having m ² and an apparent density of 0.42 g / cm ³ was obtained. The porosity of the woven fabric was 1.5% and the SPF value was 45. This fabric prevents sunburn due to UV rays and has a soft texture,
In addition, the fabric was highly breathable, highly hygroscopic, and excellent in coolness.

Example 6 A plain woven fabric was prepared by using the same composite yarn as in Example 1 for warp and weft, and after scouring, subjected to a dry heat setting at 180 ° C. to give a warp density of 116 yarns / inch and a weft density of 80 yarns. / Inch, thickness 0.19mm, basis weight 86g /
A woven fabric having m ² and an apparent density of 0.45 g / cm ³ was obtained. The porosity of the woven fabric was 0.5% and the SPF value was 120. This woven fabric was a woven fabric that prevented sunburn due to ultraviolet rays, had a soft texture, and had high air permeability and hygroscopicity and was excellent in coolness.

Example 7 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. 75 containing 1.3% by weight of titanium oxide in a warp made of a core-sheath type synthetic fiber (75 denier 36 filaments)
A plain woven fabric is prepared by using a denier 45 filament copper-ammonium rayon as the weft, and after scouring, heat setting is performed at 180 ° C. with dry heat to obtain a warp density of 125 threads / inch and a weft density of 8
7 pieces / inch, thickness 0.14mm, basis weight 77g / m ² ,
A woven fabric having an apparent density of 0.55 g / cm ³ was obtained. The porosity of this fabric was 1.4%, and the SPF value was 130. This fabric prevents sunburn due to UV rays and has a soft texture,
In addition, the fabric was highly breathable, highly hygroscopic, and excellent in coolness.

Example 8 Polyester fiber containing 0.1% by weight of titanium oxide (36 filaments of 75 denier, warp yarn, and 45 deniers of 75 filaments containing 1.3% by weight of titanium oxide, a weft of copper ammonia method rayon After the scouring, heat setting was performed at 180 ° C. with dry heat to obtain a warp density of 124 yarns / inch and a weft density of 86.
A woven fabric having a book / inch, a thickness of 0.15 mm, a basis weight of 75 g / m ² , and an apparent density of 0.5 g / cm ³ was obtained. The porosity of the woven fabric was 1.6% and the SPF value was 41. This woven fabric was a woven fabric that prevented sunburn due to ultraviolet rays, had a soft texture, and had high air permeability and hygroscopicity and was excellent in coolness.

Comparative Example 1 A Mitsubishi LS-2 false twister
Concentric polyester core / sheath synthetic fiber (100 denier) comprising 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. 72 filaments) were subjected to false twisting at a spindle rotation speed of 250,000 rpm, a twist number of 2800 T / m, a first heater temperature of 200 ° C, and a second heater temperature of 190 ° C.

Using this false twisted yarn, a knitted fabric is produced with a 32G single circular knitting machine, and after scouring, subjected to a dry heat setting at 180 ° C. to give 53 courses / inch, 43 wales / inch.
A knitted fabric having a thickness of 0.60 mm, a basis weight of 118 g / m ² and an apparent density of 0.2 g / cm ³ was obtained. The opening ratio of the knitted fabric is 1.8
%, The SPF value was 51. The knitted fabric prevented sunburn due to ultraviolet rays, had a soft texture and high air permeability, but had low hygroscopicity and was somewhat inferior in cooling.

[Comparative Example 2] 32G using a 40th cotton thread
A single circular knitting machine is used to make a knitted fabric and after scouring,
° C dry heat set, 51 courses / inch, 40 wales / inch, thickness 0.57mm, basis weight 110g / m ² ,
A knitted fabric having an apparent density of 0.19 g / cm ³ was obtained. The opening ratio of the knitted fabric was 1.8%, and the SPF value was 8. The knitted fabric had a soft texture, a high air permeability, a high hygroscopicity, and a high degree of coolness, but was inferior in the effect of preventing sunburn due to ultraviolet rays.

[Comparative Example 3] Using a Mitsubishi LS-2 false twisting machine,
Concentric polyester core-sheath type synthetic fiber (50 denier) comprising a core portion containing 2.0% 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. 36 filaments) and titanium oxide.
A 50-denier 30-filament copper-ammonium rayon containing 5% by weight was interlaced, and then false-twisted at a spindle rotation speed of 250,000 rpm, a twist number of 2800 T / m, and a first heater temperature of 180 ° C. to obtain a composite yarn.

A knitted fabric is produced from the composite yarn using a 32G single circular knitting machine. After scouring, a 180 ° C. dry heat setting is performed to obtain 73 courses / inch, 42 wales / inch, a thickness of 0.59 mm, and a basis weight of 133 g / g. m ² , apparent density 0.2
A knit of ³ g / cm ³ was obtained. The porosity of this knit is 2.0
%, The SPF value was 17. The knitted fabric had a soft texture, a high air permeability, a high hygroscopicity, and a high refreshing property, but was inferior in the effect of preventing sunburn due to ultraviolet rays.

[Comparative Example 4] A knitted fabric was prepared with a 32G single circular knitting machine using the same composite yarn as in Example 1. After scouring, a dry heat set at 180 ° C was performed to obtain 90 courses / inch.
44 wale / inch, thickness 0.56 mm, basis weight 179
g / m ² and an apparent density of 0.32 g / cm ³ were obtained. The opening ratio of the knitted fabric was 0.4%, and the SPF value was 98. Although this knitted fabric had an effect of preventing sunburn due to ultraviolet rays and had high hygroscopicity, it was a knitted fabric having a hard texture, low air permeability, and somewhat poor cooling.

Comparative Example 5 A plain woven fabric was prepared by using the same composite yarn as in Example 1 for warp and weft, and after scouring, a dry heat setting was performed at 180 ° C. to give a warp density of 103 / inch and a weft density of 40. / Inch, thickness 0.16mm, basis weight 62g /
A woven fabric having an m ² and an apparent density of 0.39 g / cm ³ was obtained. The porosity of the woven fabric was 7.5% and the SPF value was 15. This woven fabric had a soft texture, high air permeability, high hygroscopicity, and high refreshability, but was poor in the effect of preventing sunburn by ultraviolet rays.

Comparative Example 6 A plain woven fabric was prepared by using the same composite yarn as in Example 1 for warp and weft, and after scouring, subjected to a dry heat setting at 180 ° C. to give a warp density of 116 yarns / inch and a weft density of 96 yarns. / Inch, thickness 0.14mm, basis weight 93g /
A woven fabric having m ² and an apparent density of 0.66 g / cm ³ was obtained. The porosity of the woven fabric was 0.2% and the SPF value was 140. This woven fabric had an effect of preventing sunburn due to ultraviolet rays and had high hygroscopicity, but had a hard texture and low air permeability and was slightly inferior in cooling.

[0053]

[Table 3]

[0054]

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, the fabric has a soft texture, high air permeability, high moisture absorption, and excellent cooling properties.

Continued on the front page F term (reference) 4L002 AA00 AA05 AB02 AB04 AB05 AC00 BA01 DA01 EA00 EA02 FA02 FA03 4L035 DD18 EE07 FF10 JJ05 KK01 4L048 AA13 AA20 AA28 AA56 AB07 AB08 AB09 AB21 AC01 BA01 BA02 CA03 CA01 DA02

Claims (6)

[Claims] 1. A fabric in which a synthetic fiber and an artificial cellulose fiber are mixed, wherein at least one of the synthetic fiber and the artificial cellulose fiber contains inorganic oxide fine particles, and the porosity of the fabric is 0.3% or more and 7% or more. An ultraviolet shielding fabric, wherein the SPF value shown in the following formula (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 cloth, and Δλ represents the measurement wavelength interval = 2 nm. 2. A synthetic fiber comprising:
3.0% by weight to 20.0% by weight of synthetic fibers and / or inorganic oxide fine particles containing not less than 6.0% by weight and not more than 6.0% by weight.
Weight% or less, and 2.0% by weight of inorganic oxide fine particles.
The fabric according to claim 1, wherein the fabric is a core-sheath type synthetic fiber having a sheath portion containing not more than 5% by weight. 3. The fabric according to claim 1, wherein the artificial cellulose fibers contain inorganic oxide fine particles in an amount of 0.5% by weight or more and 5.0% by weight or less. 4. The fabric according to claim 1, wherein the synthetic fiber and the artificial cellulose fiber are yarn-composite. 5. The fabric has an apparent density of 0.65 g / cm ^3.
The fabric according to any one of claims 1 to 4, wherein the fabric is: 6. The fabric according to claim 1, wherein the fabric is a knitted fabric having an apparent density of 0.3 g / cm ³ or less.