JP2019178448A - Glossy woven or knitted fabric - Google Patents

Abstract

To provide a woven or knitted fabric having soft feeling suitable for clothing use, which has an excellent glossy feeling, and in which shade is emphasized to exhibit deep aesthetic property when the woven or knitted fabric is bent.SOLUTION: In a woven or knitted fabric, a relation of a regular reflection intensity Iat an incident angle of 60° and a regular reflection intensity Iat an incident angle of 8° to an incident light having a wavelength of 300 to 750 nm in the warp/weft directions of the woven or knitted fabric satisfies I/I>0.5, and both the relative glossiness at an incident angle of 45° and the relative glossiness at an incident angle 60° are between 1.5 or more and 3.0 or less.SELECTED DRAWING: None

Description

  The present invention relates to a woven or knitted fabric.

  Synthetic fibers made of polyester, polyamide, etc. are widely used for clothing due to their excellent mechanical properties and washability, and materials with new sensibility and aesthetics are required as people's lives diversify. .

  Especially for glossy materials that pursue aesthetics, in addition to fibers that minimize the additive in the polymer and increase the gloss unique to polyester, the reflectance is improved by atypical fiber cross-sections and metal film deposition, resulting in a glossy woven or knitted fabric. Techniques for imparting have been studied.

  Further, for example, Patent Document 1 discloses a technique for obtaining a fiber having an aesthetic property like a metal by laminating polymers having different refractive indexes in the fiber and optical interference of light reflected at the lamination interface.

JP 2007-146338 A (Claims)

  Although there is a technique for obtaining a glossy woven or knitted fabric by the interference coloring effect at the interface of different refractive index phase in the fiber as in Patent Document 1, when flat cross-section fibers are used, the smooth surfaces of a plurality of fibers are aligned. In addition to the occurrence of specific glare, a strong gloss feeling can be visually recognized, but a woven or knitted fabric having a glossiness with a shadow and depth when the woven or knitted fabric is bent has not been obtained.

  In view of the above-mentioned problems of the prior art, the present invention has a soft texture suitable for apparel, which has an excellent gloss and exhibits a deep aesthetics when a woven or knitted fabric is bent and has a deep shadow. The object is to provide a woven or knitted fabric.

The object of the present invention is achieved by the following means.
(1) with respect to incident light having a wavelength 300~750nm to via / weft directions of the woven or knitted fabric, the relationship between the specular reflection intensity _{I 8} at an incident angle of 8 degrees specular reflection intensity _{I 60} at an incident angle of 60 degrees _{I 8} A woven or knitted fabric satisfying / I ₆₀ > 0.5 and having a relative glossiness of 1.5 to 3.0 at an incident angle of 30-60 °.
(2) The woven or knitted fabric according to claim 1, wherein an average reflectance with respect to incident light having a wavelength of 300 to 750 nm is 20% or more.
(3) The woven or knitted fabric according to claim 1 or 2, wherein the average transmittance for incident light having a wavelength of 300 to 750 nm is 40% or less.
(4) A woven or knitted fabric having the characteristics according to any one of claims 1 to 3, wherein fibers containing a plurality of phases having different refractive indexes are used at least in part.
(5) The woven or knitted fabric having the characteristics according to any one of claims 1 to 4, wherein at least a part of fibers having a structure in which a plurality of phases having different refractive indexes are concentrically laminated are arranged.
(6) The woven or knitted fabric having the characteristics according to any one of claims 1 to 5, wherein a fiber having a titanium oxide content of 0.5% by mass or less is used at least in part.
(7) The characteristic according to any one of claims 1 to 6, wherein a fiber containing 0.01 to 5.0 mass% of light absorbing particles in at least one phase constituting the fiber is used at least in part. Woven knitted fabric.

  The woven or knitted fabric of the present invention is characterized in that when the woven or knitted fabric is bent, the shadow is emphasized and a deep gloss is exhibited.

It is a conceptual diagram for demonstrating an incident angle, a reflection angle, regular reflection, and diffuse reflection. It is the schematic of the cross section of the direction perpendicular | vertical to the fiber-axis direction of the fiber containing a several different phase. It is a conceptual diagram for demonstrating a light reception angle.

  Hereinafter, the present invention will be described in detail together with preferred embodiments.

  The basis of the present invention is that when the incidence angle / reflection angle dependency of the reflectance in the visible light wavelength region is controlled to a specific range, the shadow when the woven or knitted fabric is bent is maximized. It has become. That is, the shading of the woven or knitted fabric is characterized by the reflectance difference between the bright part formed by light reflection and the shadow (dark part) generated by the bending of the fabric and the respective areas. Reflection of light to an object is the largest in regular reflection (reflection with the same incident angle and reflection angle), and generally the reflection decreases as the incident angle decreases. Therefore, the bright part at the time of bending is limited to a region with a large incident angle. It is done. The incident angle here refers to an angle formed by the normal line of the woven or knitted fabric and the incident direction of light. FIG. 1 shows a state in which light is incident on the normal 1 at an incident angle θ1 and reflected at a reflection angle θ2. When θ1 = θ2, the reflection at the reflection angle θ2 is referred to as regular reflection, and the reflection diffused in any direction where the reflection angle θ is θ2 ≠ θ1 is referred to as diffuse reflection.

  The woven or knitted fabric of the present invention can suppress a decrease in reflectance even when the incident angle is small, and has an excellent shadow by expanding the bright area. In addition, specularly reflected light does not reach the field of view in the shadow area when the woven or knitted fabric is bent. However, if diffuse reflection (reflection with a different incident angle and reflection angle) is large, the brightness of the shadow increases, so the contrast with the bright part Decreases. The woven or knitted fabric of the present invention can reduce the lightness of the dark part by reducing the diffuse reflection, and can increase the shadow by increasing the contrast with the bright part.

Specifically, it is necessary to control the following optical parameters. First, from the viewpoint of expanding the area of the bright portion, in the present invention, the regular reflection intensity I ₆₀ at the incident angle of 60 degrees and the incident angle of 8 are used. The relation of regular reflection intensity I _{8 in} degrees satisfies I ₈ / I ₆₀ > 0.5. The regular reflection intensity here refers to the reflection intensity in regular reflection.

The specular reflection intensity at each incident angle can be evaluated using an automatic goniophotometer having a light source capable of measuring light in the wavelength region of 300 to 750 nm and a photodetector for the light source. Light in the wavelength range of 300 to 750 nm is generally called visible light, and humans can visually recognize light in this wavelength range as bright and dark. In the present invention, a halogen lamp was used as a light source and incident at an incident angle of 8 ° and 60 °, and the regular reflection intensities I ₈ and I ₆₀ were evaluated.

In order to visually recognize the shading feeling of the woven or knitted fabric, it is necessary to form a bright portion over a wide range when the woven or knitted fabric is bent. Therefore, the higher the reflectivity for light having a small incident angle with respect to the woven or knitted fabric, the more the shading feeling of the woven or knitted fabric is enhanced. That good closer maximum reflectivity I ₆₀ at an incident angle of 60 degrees and the maximum reflectance I ₈ at an incident angle of 8 degrees, the shading feeling better by a I _{8 /} I 60> _0.5 in the present invention Can be granted. Above all, the above characteristics are more remarkably exhibited at I ₈ / I ₆₀ > 0.7, and therefore can be mentioned as more preferable conditions. Furthermore, when I ₈ / I ₆₀ > 1.0, when the woven or knitted fabric is bent, a strong gloss can be obtained over a wide range of the bent portion, so that it can be mentioned as a particularly preferable condition. Since hardly feel the visible specular reflection is relatively small gloss in the case of _{I 8} / I 60> 2.0, the upper limit of _I 8 _{/ I 60} in order to express the characteristics of the present invention is usually 2. It is about zero.

Next, from the viewpoint of suppressing the brightness of the shadow, the relative glossiness at the incident angles of 45 ° and 60 ° is preferably 1.5 or more. Contrast gloss means the ratio of specular reflection to diffuse reflection, and is evaluated using an automatic goniophotometer having a light source capable of measuring light in the wavelength range of 300 to 750 nm and a photodetector for the light source. It is possible. In the present invention, light is incident on each sample at incident angles of 45 ° and 60 °, and the value obtained by dividing the reflection intensity by the minimum light intensity (diffuse reflection intensity) near the light receiving angle of 0 ° is defined as the contrast glossiness. As shown in FIG. 3, the light receiving angle θ ₃ means an angle formed by the normal line of the sample at the measurement point and a straight line connecting the measurement point and the center of the light receiver.

  The greater the contrast glossiness, the smaller the diffuse reflection on the surface of the woven or knitted fabric, and the lightness of the portion that forms a shadow when bent can be suppressed, so that an excellent shadow can be expressed. That is, excellent shading can be imparted when the relative glossiness at an incident angle of 45 ° and 60 ° is 1.5 or more, respectively. In particular, when the contrast glossiness is 1.7 or more, the contrast with the bright part is enhanced, and an excellent shadow is exhibited when the woven or knitted fabric is bent. It is particularly desirable that the contrast glossiness is 2.0 or more in order to express the above. If the contrast glossiness is excessively large, the gloss anisotropy when the woven or knitted fabric is used as clothing increases, and it becomes difficult to visually recognize the glossiness from a wide field of view, so the upper limit of the contrast glossiness is 3.0. Is preferred.

  Next, from the viewpoint of glossiness, it is desirable that the average reflectance for incident light with a wavelength of 300 to 750 nm is 20% or more. The average reflectance means the average value of the reflectance for each wavelength of 10 nm at a wavelength of 300 to 750 nm, and is evaluated using a spectrophotometer having a light source capable of measuring the reflectance at a wavelength of 300 to 750 nm. It is possible. The stronger the gloss, the brighter and darker contrast is enhanced when the woven or knitted fabric is bent and shadows are formed. Therefore, the higher the average reflectance, the better. The characteristics of this material when the average reflectance is 40% or more. Can be expressed strongly, and can be cited as a more preferable condition. In particular, it is particularly desirable that the average reflectance is 60% or more from the standpoint that excellent aesthetics can be exhibited as a glossy material regardless of environmental factors such as lighting. However, when the material comprising the glossy fiber of the present invention is used as a colored material by dyeing or the like, if an excessive average reflectance is given, white reflection is strong, and apparent color development may be reduced. Since it is assumed, the practical upper limit of the average reflectance is 99% in applications that require color development such as clothing.

  Next, from the viewpoint of forming a dark part, the average transmittance for incident light with a wavelength of 300 to 750 nm is desirably 40% or less. The average transmittance means an average value of transmittance for each wavelength of 10 nm at wavelengths of 300 to 750 nm, and a spectrophotometer having a light source capable of measuring the transmittance of wavelengths of 300 to 750 nm similar to the average reflectance. In the present invention, the measurement is performed under the condition of a light source incident angle of 8 °. The lower the average transmittance, the more the shadow when the woven or knitted fabric is bent is emphasized, so that the contrast of light and dark can be seen more clearly with the human eye, and the characteristics as a material with enhanced shading are prominent Can be demonstrated. From this viewpoint, when the average transmittance is 20% or less, a glossy woven or knitted fabric having an attractive shading feeling combined with a strong glossiness at the bright part can be obtained, and can be mentioned as a particularly preferable condition. It is possible to improve the shading feeling as the average transmittance is reduced. However, due to the structural limitations of the woven or knitted fabric having voids by being composed of fibers, the practical lower limit of the average transmittance is 0. 1%.

  The means for achieving the optical parameter is not particularly limited as long as it satisfies the scope defined in the present invention, but the optical parameter can be controlled relatively easily by selecting the following yarn design. Is possible.

  In order to increase the reflectance relatively easily with respect to light incident at a low incident angle, it is preferable that the fibers constituting the woven or knitted fabric have a plurality of phases having different refractive indexes. This is based on the characteristic that light is reflected at the interface between substances having a difference in refractive index, and the reflection at the interface increases as the difference in refractive index increases. That is, it is only necessary to combine phases having different refractive indexes inside the fiber, and the glossy fiber of the present invention preferably has a structure composed of a plurality of phases having different fiber cross sections perpendicular to the fiber axis. However, the different phases referred to here are different phases if the basic composition of the polymer is different, but if the copolymer component and the contained component are different even if the basic composition of the polymer is the same. Means that. Further, from the viewpoint of suppressing delamination and improving the composite cross section, it is more preferable that the composite phases are all the same polymer group, that is, the basic composition of the polymer is the same or similar. By using the same polymer group, high interfacial affinity can be imparted, and fibers that do not easily peel off can be obtained.

  As the basic composition of the polymer constituting the fiber, any polymer can be applied. However, polyesters such as polyethylene terephthalate, polyamides, etc. are preferable in order to achieve both a characteristic shadow and a soft texture for clothing applications. Is particularly preferred.

  The composite form of a plurality of phases having different refractive indexes is not particularly limited as long as it is a structure in which an interface between phases such as a core-sheath structure, a sea-island structure, or a laminated structure exists and satisfies the range specified in the present invention. However, if a structure in which different phases are concentrically laminated (hereinafter referred to as a concentric laminated structure) is used, almost the same reflection effect can be obtained from any position around the single yarn, and the reflective interface is aligned in a specific region. Since the occurrence of glare due to this can be suppressed, more preferable conditions can be mentioned. However, the concentric laminated structure mentioned here means a structure in which the same center of gravity is laminated in an annual ring shape from the fiber center toward the outer layer.

  Since the reflectance can be improved as the number of two-phase interfaces having different refractive indexes increases, the number of stacked layers in the stacked structure is preferably 3 or more. However, the number of laminations referred to here refers to the maximum number of laminations of an alternate laminated structure existing upward from an arbitrary point on the outermost layer of the fiber cross section perpendicular to the fiber axis toward the fiber center. When the number of stacked layers is 10 or more, the probability of reflecting the light transmitted inside the fiber is increased even at a low incident angle, and a high reflectance can be obtained. In the present invention, the total number of layers can be arbitrarily designed as long as it satisfies the range specified in the present invention. However, the mechanical properties such as good texture and wear resistance, which are the objects of the present invention, are guaranteed. Therefore, the upper limit value of the substantial number of layers is 150 layers.

  In addition, in two adjacent layers, the reflection at the stack interface can be increased as the difference in refractive index between the layers increases.

  In order to obtain an interface having a large refractive index difference relatively easily, it is preferable to form air holes in the low refractive index phase in a plurality of phases constituting the inside of the fiber. Considering that the refractive index that can be formed by the polymer constituting the fiber is approximately 1.3 to 1.8, the presence of air holes having a refractive index of approximately 1.0 provides an effect of decreasing the refractive index of the entire phase. The refractive index difference from the high refractive index phase is increased, and an increase in reflectance can be expected.

  The method of forming the air holes is not limited, and is a method of forming a hollow at the time of discharge in melt spinning described later, or a component soluble in hot water or alkali inside the fiber (hereinafter also referred to as an easily eluted component). Various methods such as a method of eluting the component, and from the viewpoint that a large number of fine air holes can be easily formed, an easily eluting component is mixed with the polymer constituting the fiber. It is preferable to use a composite fiber in which an easily eluted component is dispersed in a polymer constituting the fiber by melt spinning and eluting the easily eluted component therefrom. Further, as the easily eluting component, for example, readily water-eluting polyethylene glycol, easily alkali-eluting 5-sodium sulfoisophthalic acid copolymer polyester, easily organic solvent-eluting polystyrene, etc. are used. The formation of air holes is possible not only in polymers that are easy to elute, but also in polyester systems that are difficult to elute.

  The titanium oxide content in the fibers constituting the woven or knitted fabric of the present invention is not particularly limited, but when the titanium oxide content is high, the reflectance of the material with respect to incident light having a wavelength of 300 to 750 nm is high. Even in this case, the diffuse reflection on the titanium oxide particles increases, so that the amount of reflected light that enters the human eye decreases, making it difficult to feel glossiness. Therefore, the titanium oxide content in the fiber is preferably 0.5% by mass or less. When the titanium oxide content is 0.1% by mass or less, it can be mentioned as a more preferable condition because aesthetic properties with excellent gloss and shading are obtained by further suppressing irregular reflection.

  The addition of other additives to the fibers constituting the woven or knitted fabric of the present invention is not particularly limited, but when trying to suppress the average transmittance for incident light having a wavelength of 300 to 750 nm relatively easily, It is preferable to contain 0.01 to 5.0% by mass of light absorbing particles in at least one phase of the fibers constituting the woven or knitted fabric. However, the light absorption particle said here means the particle | grains which have an absorption wavelength range in wavelength 300-750 nm. The kind of the light absorbing particles contained in the glossy fiber in the present invention is not particularly limited. For example, in addition to the visible light wavelength range, carbon black that absorbs up to the infrared wavelength range and imparts heat storage properties, infrared It is more preferable to use functional particles such as perylene black that reflects the wavelength and imparts heat-shielding properties, since further functionality can be imparted to the glossy fiber of the present invention. When the light absorbing particles are contained in one polymer in the range of 0.01 to 5.0% by mass, the light absorbing effect by the particles can be exhibited and light transmission can be suppressed, which is preferable. Furthermore, by controlling to 1.0% by mass or less, light transmission can be suppressed without hindering light reflection, and the balance of average reflectance and average transmittance necessary for the woven or knitted fabric of the present invention can be controlled within an optimal range. It can be mentioned as a more suitable range.

  The woven or knitted fabric of the present invention achieves a deeper shade by realizing a high reflectance and a low transmittance. Therefore, in the case where a phase containing light-absorbing particles is combined in the fiber, it is preferable to arrange the fibers so as not to inhibit light reflection at other phases and interfaces. The cross-sectional shape of the light absorption region is not particularly limited, but from that point of view, in the fiber cross section perpendicular to the fiber axis, the light absorption region has a core portion A having a core-sheath structure as shown in FIGS. 2 (a) and 2 (b). It is preferable that the core portion passes through the fiber center. However, the fiber center mentioned here means the intersection of two arbitrary straight lines that bisect the area of the fiber cross section perpendicular to the fiber axis. 2A and 2B are schematic views of a cross section of a core-sheath structure including a core part A and a sheath part B. FIG. By making the core portion A a light absorption region, the incident light first passes through the light reflection region of the sheath portion, so that it is possible to minimize the influence of a decrease in reflectance due to the light absorption particles.

The raw machine design of the woven or knitted fabric of the present invention is not particularly limited as long as it satisfies the scope of the present invention, but the higher the density, the better the aesthetics can be obtained. This means that as the number of fibers per unit area increases, the reflection area increases and the gloss improves.In addition, the transmission of light from the back of the woven or knitted fabric is suppressed, and the darkness of the area that becomes a shadow when the woven or knitted fabric is bent. This is because is more noticeable. From this viewpoint, the cover factor of the fabric of the present invention is preferably 1700 or more, and more preferably 2000 or more. However, the cover factor here is defined as {(weft fineness) ^0.5 × weft density + (warp fineness) ^0.5 × warp density}. When this idea is promoted, when the cover factor is 2200 or more, a particularly excellent shadow is exhibited. From the viewpoint of weaving properties, the practical upper limit of the cover factor is 4000.

  The structure of the woven or knitted fabric of the present invention is not particularly limited, but from the viewpoint of obtaining the above high cover factor, the woven structure is preferably a twill structure or a satin structure, and a satin structure is particularly preferable.

  The high-order processing method of the woven or knitted fabric of the present invention is not particularly limited as long as it satisfies the scope of the present invention. However, when a laminated fiber into which air holes are introduced by an easily eluting component is used, color developability and gloss development are exhibited. From the viewpoint, it is preferable to remove easily eluted components and introduce air holes before dyeing.

  Specifically, in the pre-dyeing treatment, wet heat treatment is performed for 30 minutes or more at a temperature of 100 ° C. or higher to remove easily eluted components. In order to sufficiently remove easily-eluting components and generate desired air holes in the layer, it is more preferable that the treatment temperature is 120 ° C. or more and the treatment time is 60 minutes or more.

  Hereinafter, the knitted or knitted fabric of the present invention will be specifically described with reference to examples. The following evaluation was performed about the Example and the comparative example.

Optical evaluation (regular reflection intensity, average reflectance, average transmittance, contrast gloss)
Four optical parameters of regular reflection intensity, average reflectance, average transmittance, and contrast gloss were calculated using the following method.

(1) Regular reflection intensity The regular reflection intensity was measured by applying light to each sample at an incident angle of 8 ° and 60 ° using an automatic goniophotometer (GONIOPHOTOMETER GP-200 type) manufactured by Murakami Color Research Laboratory. The light intensity at a light receiving angle of 0 ° to 90 ° was measured every 1 ° by two-dimensional reflected light distribution measurement, and the reflection intensity in the regular reflection direction was adopted as the regular reflection intensity. In the present invention, the same sample is measured three times per place, a simple number average of the results obtained for a total of 10 places is obtained, and the value rounded to the second decimal place is the measured value of the evaluation sample. It was.

(2) Average reflectance The average reflectance is measured by standardizing the reflection intensity of a standard white plate (BaSO4) as 100 using a spectrophotometer manufactured by SHIMADZU (UV-3100PC series), and then taking out the standard white plate. Set the sample, measure the reflectance (including specular reflection) of each sample in the wavelength range of 300 to 750 nm at a light incident angle of 8 °, and calculate the average value of the reflectance in the wavelength range from the measured value for every 20 nm Was calculated. This operation was performed three times per place, and a simple number average of results obtained by performing this operation for a total of 10 places was obtained, and a value obtained by rounding off the decimal point was taken as the average reflectance.

(3) Average transmittance The average transmittance was measured by standardizing the reflection intensity of a standard white plate (BaSO4) as 100 using a spectrophotometer manufactured by SHIMADZU (UV-3100PC series), and then taking out the standard white plate. Set a sample, measure the transmittance (including specular reflection) of each sample in the wavelength range of 300 to 750 nm at a light incident angle of 8 °, and measure the average value of the transmittance in the wavelength range from the measured values for every 20 nm Was calculated. This operation was performed three times per place, and a simple number average of results obtained by performing this operation for a total of 10 places was obtained, and a value obtained by rounding off the decimal places was taken as the average transmittance.

(4) Contrast glossiness b Next, contrast glossiness is measured by using an automatic goniophotometer (GONIOPHOTOMETER GP-200 type) manufactured by Murakami Color Research Laboratory, with light incident on each sample at an incident angle of 60 °. The light intensity at a light receiving angle of 0 ° to 90 ° is obtained for each 1 ° by two-dimensional reflected light distribution measurement, and the maximum light intensity (specular reflection) near the light receiving angle of 60 ° is the minimum light intensity near the light receiving angle of 0 °. The value divided by (diffuse reflection) was calculated. This operation was performed three times per place, a simple number average of the results obtained by performing this operation for a total of 10 places was obtained, and the value obtained by rounding off the second decimal place was taken as the contrast glossiness.

  Further, instead of setting an incident angle of 60 ° and a light receiving angle of 60 °, the same measurement was performed with an incident angle of 45 ° and a light receiving angle of 45 °, and the relative glossiness at an incident angle of 45 ° was measured.

[Example 1]
Polyethylene terephthalate (titanium oxide content: 0% by mass) as phase 1, polyethylene terephthalate (titanium oxide content: 0% by mass) alloyed with 12.5% by mass of polyethylene glycol (PEG) as phase 2, phase 3 A polyester fiber of 56 dtex-24 filaments made of polyethylene terephthalate (titanium oxide content: 0%) containing 0.25% by mass of carbon black particles was prepared. Regarding the cross section in the direction perpendicular to the fiber axis direction, as shown in FIG. 2 (c), the core 1 is provided with the phase 1 with the Y-shaped phase 3, and the outer side thereof is concentrically with the phase 2 and the phase 1 To provide a concentric laminated structure. A plain woven fabric (warp density [lines / 2.54 cm] × weft density [lines / 2.54 cm] = 150 × 95) made of the fibers is prepared and subjected to desizing and scouring treatment, followed by wet heat treatment at a temperature of 130 ° C. for 90 minutes. To remove the contained PEG and introduce air holes inside the fiber.

The optical parameters of the resulting fabric were I ₈ / I ₆₀ = 0.6, the average reflectance was 42%, the average transmittance was 23%, and the relative glossiness at incident angles of 45 ° and 60 ° was 2.22, 2 respectively. .54. The fabric had an excellent gloss, and when it was bent, the shading was strongly visible.

[Example 2]
Polyethylene terephthalate (titanium oxide content: 0% by mass) as phase 1, polyethylene terephthalate (titanium oxide content: 0% by mass) alloyed with 12.5% by mass of polyethylene glycol as phase 2, and carbon black as phase 3 A 56 dtex-24 filament polyester fiber made of polyethylene terephthalate (titanium oxide content: 0%) containing 0.25% by mass of particles was prepared.

  A phase 1 having a Y-shaped phase 3 arranged in the core portion was arranged, and phases 2 and 1 were laminated concentrically on the outer side to form a concentric laminated structure having 10 laminated layers. A plain woven fabric (warp density [lines / 2.54 cm] × weft density [lines / 2.54 cm] = 150 × 95) made of the fibers is prepared and subjected to desizing and scouring treatment, followed by wet heat treatment at a temperature of 130 ° C. for 90 minutes. To remove the contained PEG and introduce air holes inside the fiber.

The optical parameters of the obtained fabric were I ₈ / I ₆₀ = 0.8, the average reflectance was 47%, the average transmittance was 19%, and the relative glossiness at incident angles of 45 ° and 60 ° was 1.96, 2 .35. Increasing the number of laminated layers 1 and 2 of the fibers constituting the fabric increased the light reflection of incident light at a low incident angle, and the fabric was particularly emphasized in gloss and shading.

[Comparative Example 1]
A polyester fiber of 56 dtex-24 filament made of polyethylene terephthalate (titanium oxide content: 0% by mass) was prepared. A plain woven fabric (warp density [lines / 2.54 cm] × weft density [lines / 2.54 cm] = 150 × 95) made of the fibers is prepared and subjected to desizing and scouring treatment, followed by wet heat treatment at a temperature of 130 ° C. for 90 minutes. Was given.

The optical parameters of the resulting fabric were I ₈ / I ₆₀ = 0.3, the average reflectance was 46%, the average transmittance was 52%, and the relative glossiness at incident angles of 45 ° and 60 ° was 4.5, 5, respectively. 0.0. Although the woven fabric has high specular reflection intensity, the light reflection of incident light at a low incident angle is small and the transmittance is high, so the bright part when the fabric is bent is very limited and lacks shading. there were.

[Comparative Example 2]
A polyester fiber of 56 dtex-24 filament made of polyethylene terephthalate (titanium oxide content: 2.2% by mass) was prepared. A plain woven fabric (warp density [lines / 2.54 cm] × weft density [lines / 2.54 cm] = 150 × 95) made of the fibers is prepared and subjected to desizing and scouring treatment, followed by wet heat treatment at a temperature of 130 ° C. for 90 minutes. Was given.

The optical parameters of the resulting fabric were I ₈ / I ₆₀ = 0.8, the average reflectance was 71%, the average transmittance was 24%, and the relative glossiness at incident angles of 45 ° and 60 ° was 1.2, 1, respectively. .3. Although the average reflectance was high and the transmittance was low, the reflected light was not diffused by the diffused light, and the glossiness excellent in the shadow characteristic of the woven or knitted fabric of the present invention was not visually recognized.

[Comparative Example 3]
56 dtex-24 filament composed of polyethylene terephthalate (titanium oxide content: 0% by mass) as phase 1 and polyethylene terephthalate (titanium oxide content: 0% by mass) containing 0.5% by mass of carbon black particles as phase 2. Polyester fibers were prepared. The cross-sectional shape of the fiber was a core-sheath structure in which the phase 2 arranged in a Y-shape was the core and the phase 1 was the sheath. A plain woven fabric (warp density [lines / 2.54 cm] × weft density [lines / 2.54 cm] = 150 × 95) made of the fibers is prepared and subjected to desizing and scouring treatment, followed by wet heat treatment at a temperature of 130 ° C. for 90 minutes. Was given.

The optical parameters of the resulting fabric were I ₈ / I ₆₀ = 0.3, the average reflectance was 45%, the average transmittance was 28%, and the relative glossiness at incident angles of 45 ° and 60 ° was 2.8, 2 respectively. .9. The fabric exhibited a glossy light black color, but the area of the bright portion when bent was small, and the shadow was not strongly visible.

  The woven and knitted fabrics obtained in this way are used for general clothing such as inner and outer clothing and apparel for interior clothing such as curtains and cloth, taking advantage of the unique aesthetics obtained by the excellent shadow and gloss when the woven and knitted fabric is bent. It can be used widely as an application.

θ ₁ : Incident angle θ ₂ : Reflection angle A: Core part B: Sheath part θ ₃ : Light receiving angle

Claims (7)

Respect to the incident light of wavelength 300~750nm to via / weft directions of the woven or knitted fabric, the relationship between the specular reflection intensity _{I 8} at an incident angle of 8 degrees specular reflection intensity _{I 60} at an incident angle of 60 degrees _I 8 _{/ I 60} A woven or knitted fabric satisfying> 0.5 and having a relative glossiness of 1.5 or more and 3.0 or less at incident angles of 45 ° and 60 °, respectively. The woven or knitted fabric according to claim 1, wherein an average reflectance with respect to incident light having a wavelength of 300 to 750 nm is 20% or more. The woven or knitted fabric according to claim 1 or 2, wherein an average transmittance for incident light having a wavelength of 300 to 750 nm is 40% or less. The woven or knitted fabric according to any one of claims 1 to 3, wherein a fiber including a plurality of phases having different refractive indexes is used at least in part. The knitted or knitted fabric according to any one of claims 1 to 4, wherein a fiber having a structure in which a plurality of phases having different refractive indexes are concentrically stacked and arranged is used at least in part. The woven or knitted fabric having the characteristics according to any one of claims 1 to 5, wherein a fiber having a titanium oxide content in the fiber of 0.5% by mass or less is used at least in part. The knitted or knitted fabric having the characteristics according to any one of claims 1 to 6, wherein a fiber containing 0.01-5.0% by mass of light-absorbing particles in at least one phase constituting the fiber is used at least in part. .