Bleaching method and bleaching device

Abstract

To provide a bleaching method capable of bleaching a colored fiber product even without high temperature treatment or using a chemical agent, and also to provide a bleaching device used for the bleaching method.SOLUTION: A bleaching method involves a step to irradiate a colored fiber with light including a wavelength of 360 to 600 nm in the presence of oxygen.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a bleaching method and apparatus. [Background technology]

[0002] In recent years, from the perspective of environmental protection, there has been an increasing demand for the reduction of resource consumption and environmental impact of petrochemical products. Textile products, which are one type of petrochemical product, require a large amount of energy to produce and are known to have an environmental impact, such as carbon dioxide emissions, during the production process. Therefore, eco-friendly initiatives have been sought, such as reducing waste through textile recycling and developing durable textile products.

[0003] One way to reduce the environmental impact of textile products such as clothing is to extend the life of the textile products. However, handling textile products for a long period of time can cause various problems, such as discoloration due to adhesions, discoloration due to deterioration of the fibers due to heat or ultraviolet rays, shrinkage and fading during washing, etc.

[0004] Among these problems, staining caused by substances attached during wear and handling is known to be a common problem even in ordinary households. The main causes of staining due to attached substances include yellowing caused by sweat and sebum, and stains from colored drinks such as vegetable and fruit juice. Sweat and sebum stains, in particular, are often difficult to completely remove using standard washing processes or detergents alone; the organic components contained in the stains accumulate in the fibers over time and are prone to yellowing due to oxidation by oxygen in the air.

[0005] Other substances that cause discoloration due to deposits include, for example, antioxidants, which are known to be oxidized by oxygen in the air and turn yellow, similar to sweat and sebum stains. Dibutylhydroxytoluene (BHT) is a known antioxidant that adheres to textile products and migrates from packaging materials and hangers during the manufacturing, distribution, and storage of textile products. Although BHT itself is white, it reacts with nitrogen oxides and other substances in the atmosphere to produce the yellow compound 3,3',5,5'-tetra-tert-butyl-4,4'-stilbenequinone (TBSQ). Because this yellow compound is sublimable, the presence of products containing BHT can cause yellowing of any material. Additionally, antioxidants are sometimes used as additives to impart deodorizing effects to textile products (see, for example, Patent Document 1), but the incorporation of antioxidants can cause the textile products to become discolored over time.

[0006] As a means for solving the above-mentioned discoloration of textile products, it is known to wash the textile products using a clothing bleaching detergent that mainly has a bleaching effect. Oxygen-based bleaching detergents in particular are the mainstream bleaching detergents for clothing because they do not cause discoloration even when applied to textile products such as colored and patterned clothing.

[0007] However, the oxygen bleaching detergent does not have a sufficiently high bleaching power, and therefore has the problem that it is difficult to completely remove the substances that cause discoloration. In view of these problems, many additives have been investigated and disclosed to improve the bleaching power of oxygen-based bleaching detergents, such as bleach activators containing organic peroxides and bleach activation catalysts using metal complexes as catalysts (see, for example, Patent Documents 2 to 5). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 10-131042 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-147394 [Patent Document 3] Japanese Patent Application Laid-Open No. 2004-331816 [Patent Document 4] Japanese Patent Application Laid-Open No. 2010-150679 [Patent Document 5] International Publication No. 2012 / 073150 Summary of the Invention [Problem to be solved by the invention]

[0009] However, the above-mentioned conventionally proposed techniques for removing discoloration-causing substances still have the problem of being insufficient. To address this problem, other methods have been proposed for improving bleaching power, such as high-temperature treatment in which bleaching is performed under high-temperature steam, and the use of chemicals such as stronger chlorine bleaches (e.g., hypochlorous acid and dichlorocyanuric acid). However, the former method has the problem of requiring enormous energy consumption and causing significant damage to textile products, while the latter method has the problem of imposing a burden on the environment and often causing fading of the fabric. Furthermore, if textile products are not rinsed thoroughly after using strong chemicals, the chemical components remaining on the textile products may change over time and become discolored, or the fluorescent whitening agent may be removed by the chemicals, causing the textile products to appear yellowed.

[0010] Therefore, an object of the present invention is to provide a bleaching method that can bleach colored textile products without high-temperature treatment or the use of chemicals, and a bleaching apparatus to be used in the bleaching method. [Means for solving the problem]

[0011] As a result of extensive research to solve the problems of the prior art described above, the inventors discovered that irradiating colored fibers with light of a specific wavelength changes the colored components of the fibers into non-colored components, leading to the completion of the present invention. That is, the present invention is as follows.

[0012] [1] The method includes a step of irradiating the colored fiber with light having a wavelength of 360 to 600 nm in the presence of oxygen. Bleaching method. [2] The output of the light is 0.001W / cm 2 That's all. The bleaching method described in [1] above. [3] The colored fibers are colored by external deposits. The bleaching method according to [1] or [2] above. [4] The external deposits are at least one selected from the group consisting of squalene, cholesterol, wax, triglycerides, diglycerides, monoglycerides, fatty acids, proteins, minerals, and microorganisms. The bleaching method described in [3] above. [5] The colored fibers are colored by tanning and / or thermal degradation. The bleaching method according to [1] or [2] above. [6] The colored fibers are animal hair fibers or silk fibers. The bleaching method according to any one of [1] to [5] above. [7] The wavelength of the light is 360 to 390 nm. The bleaching method according to any one of [1] to [6] above. [8] The wavelength of the light is 390 to 480 nm. The bleaching method according to any one of [1] to [6] above. [9] The colored fiber is irradiated with the light without being brought into contact with a solvent. The bleaching method according to any one of [1] to [8] above.

[10] The colored fiber is irradiated with the light while in contact with water and / or alcohol. The bleaching method according to any one of [1] to [8] above.

[11] The colored fiber is cooled and then irradiated with the light. The bleaching method according to any one of [1] to

[10] above.

[12] In the step of irradiating light, a light emitting diode light source and / or a laser light source is used. The bleaching method according to any one of [1] to

[11] above.

[13] A light irradiation unit that irradiates light having a wavelength of 360 to 600 nm onto the colored fiber in the presence of oxygen. Bleaching equipment.

[14] a guard that transmits the light is provided between the light irradiation unit and the colored fiber; The bleaching device according to

[13] above.

[15] The light is 0.001 W / cm 2 The colored fiber is irradiated with an illuminance of at least The bleaching device according to

[13] or

[14] above.

[16] A cooling section for cooling the colored fibers is provided. The bleaching device according to any one of

[13] to

[15] above.

[17] The cooling unit cools the colored fiber to 30°C or less. The bleaching device according to

[16] above.

[18] The colored fiber is disposed at a position facing the light irradiation unit, a light-shielding part is provided at a position that does not obstruct light irradiation from the light irradiating part to the colored fiber; The bleaching device according to any one of

[13] to

[17] above.

[19] the cooling unit has a water supply tank and a water spray unit, The water spray unit sprays water onto the colored fibers. The bleaching device according to any one of

[16] to

[18] .

[20] the cooling unit is an air-cooled heat sink and / or a water-cooled heat sink, The cooling section has holes and / or grooves on the surface that contacts the colored fibers, Water vapor and / or water are discharged from the holes and / or grooves. The bleaching device according to any one of

[16] to

[18] . 〔twenty one〕 a temperature detector for detecting the temperature of the colored fiber; The temperature detector causes the light irradiation unit to stop irradiating light in response to the detected temperature. The bleaching device according to any one of

[16] to

[20] above. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a bleaching method that can bleach colored textile products without high-temperature treatment or the use of chemicals, and a bleaching apparatus used in the bleaching method. [Brief explanation of the drawings]

[0014] [Figure 1] This shows the UV-vis spectra of a sample of 3,3',5,5'-tetra-tert-butyl-4,4'-stilbenequinone (TBSQ), a coloring component found on textiles, that was not irradiated ("before irradiation") and a sample that was irradiated with 445 nm light at an integrated light intensity of 3.75 W·hr / cm2 ("after irradiation"). [Figure 2] The UV-vis spectra of β-carotene, a coloring component found on fibers, are shown for a sample that was not irradiated ("before irradiation") and a sample that was irradiated with 445 nm light at an integrated light intensity of 3.75 W·hr / cm2 ("after irradiation"). [Figure 3] The UV-vis spectra of lycopene, a coloring component found on fibers, are shown for a sample that was not irradiated ("before irradiation") and a sample that was irradiated with 445 nm light at an integrated light intensity of 3.75 W·hr / cm2 ("after irradiation"). [Figure 4]This graph plots the relationship between the cumulative amount of light and whiteness when irradiating a sample with 445 nm light, which is impregnated with an orange-containing beverage (manufactured by Kirin Co., Ltd., product name "Tropicana 100%)), a coloring component that adheres to fibers. [Figure 5] 1 shows a schematic cross-sectional view of an example of a bleaching device according to an embodiment of the present invention. [Figure 6] 1 is a schematic cross-sectional view of another example of the bleaching device of the present embodiment. [Figure 7] 1 is a schematic cross-sectional view of a bleaching device according to an embodiment of the present invention, in which a cooling section is provided. [Figure 8] 1A is a schematic cross-sectional view of an example of a configuration in which a water-cooled heat sink is provided as a cooling unit in the bleaching device of the present embodiment. FIG. 1B is a schematic top view of the water cooling unit. [Figure 9] 1A is a schematic cross-sectional view of an example of a configuration in which an air-cooled heat sink is provided as a cooling unit in the bleaching device of the present embodiment. 1B is a schematic top view of the air-cooling unit. [Figure 10] 1A is a schematic cross-sectional view of another example of a bleaching device according to the present embodiment, in which an air-cooled heat sink is provided as a cooling unit. 1B is a schematic top view of the air-cooling unit. [Figure 11] 1 is a schematic cross-sectional view of a bleaching device according to an embodiment of the present invention, in which a heating unit is provided. [Figure 12] 1 is a schematic cross-sectional view of a bleaching device according to an embodiment of the present invention, in which a water spray unit is provided. [Figure 13] 1 is a schematic cross-sectional view of another example of the bleaching device of the present embodiment. [Figure 14] 1 is a schematic cross-sectional view of a bleaching device configured to use an iron as a heating unit. [Figure 15] 1 is a schematic cross-sectional view showing a use mode of a bleaching device configured to use an iron in a heating section. [Figure 16] 1 is a schematic cross-sectional view of another example of the bleaching device of the present embodiment. [Figure 17] 1 is a schematic cross-sectional view of another example of the bleaching device of the present embodiment. [Figure 18] FIG. 2 is a schematic front view of another example of the bleaching device of the present embodiment. [Figure 19] FIG. 2 is a schematic front view of another example of the bleaching device of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Below, we will explain in detail the form for implementing the present invention (hereinafter referred to as the ``present embodiment''), but the present invention is not limited to the following description and can be implemented in various modifications within the scope of its gist.

[0016] [Bleaching method] The bleaching method of the present embodiment includes a step of irradiating colored fibers with light having a wavelength of 360 to 600 nm in the presence of oxygen.

[0017] According to the bleaching method of this embodiment, light acts only on organic components corresponding to the irradiation wavelength, without the need for high-temperature treatment or the use of chemicals, and the color can be bleached without causing significant damage to the fiber.

[0018] (fiber) The fibers to be bleached in the bleaching method of this embodiment are not particularly limited, and any fibers commonly used as fibers can be used. Examples include, but are not limited to, natural fibers, synthetic fibers, semi-synthetic fibers, regenerated fibers, and blends of these fibers. Furthermore, textile products made from these fibers, such as cloth, clothing, bags, and shoes, are also eligible for bleaching in the bleaching method of this embodiment.

[0019] Examples of natural fibers include, but are not limited to, animal fibers such as animal hair fibers (wool, cashmere, etc.) and silk fibers (silk, etc.), plant fibers such as seed hair fibers (cotton, cotton, kapok, etc.), bast fibers (hemp, linen, jute, etc.), and leaf vein fibers (sisal, etc.).

[0020] Examples of synthetic fibers include, but are not limited to, polyamide fibers (such as nylon), polyester fibers (such as polyester), polyacrylonitrile fibers (such as acrylic), polyurethane fibers (such as polyurethane), polyvinyl alcohol fibers (such as vinylon), polyvinyl chloride fibers (such as polyvinyl chloride), polyvinylidene chloride fibers (such as vinylidene), and polyolefin fibers (such as polyethylene and polypropylene).

[0021] Examples of semi-synthetic fibers include, but are not limited to, cellulosic fibers (acetate, etc.) and protein fibers (Promix, etc.).

[0022] Examples of regenerated fibers include, but are not limited to, cellulosic fibers (rayon, polynosic, cupra, etc.).

[0023] Examples of textile products include, but are not limited to, dress shirts, T-shirts, polo shirts, blouses, chinos, suits, slacks, skirts, tablecloths, placemats, curtains, bedding, hats, sofas, toilet mats, handkerchiefs, towels, knitwear, socks, underwear, tights, and masks.

[0024] (Coloring) The bleaching method of this embodiment targets colored fibers, but the colored fibers may be colored by external attachments or by deterioration of the fibers due to sun exposure and / or thermal degradation, etc.

[0025] <External deposits> The staining of fibers caused by external deposits, which are assumed to be discoloration-causing substances, will be described below, but the bleaching method of this embodiment is not limited to the following description. Discoloration caused by external attachments can be broadly divided into two categories: dirt from the human body and dirt from the environment.

[0026] Examples of dirt from the human body include sweat, sebum, skin waste products, resident skin bacteria, blood, human milk, and excrement. The components and amounts of these vary greatly depending on various factors, such as the part of the body, the number of times the garment is worn, the season, and individual differences. For example, dirt that adheres to collars and underwear includes squalene, cholesterol (including esters), wax, triglycerides, diglycerides, monoglycerides, fatty acids (including palmitic acid and oleic acid), proteins, inorganic substances, and microorganisms. Among these components, organic components such as squalene and oleic acid are colorless themselves, but they color fibers when exposed to sunlight, heat, or air oxidation.

[0027] Examples of environmental stains include stains from cooking or spills of food such as animal fats, vegetable oils, fruit juices, colored drinks, and seasonings; stains from body care products such as hand cream, body cream, soap, moisturizer, sunscreen, and cosmetics; antioxidants from packaging materials and hangers; dust and dirt in the air; and automobile exhaust fumes. When the above-mentioned ingredients are left in the presence of oil or protein for a long period of time or are thermally denatured, they tend to become more discolored and become difficult to wash or bleach.

[0028] Since the bleaching method of this embodiment includes a step of irradiating light having a wavelength of 360 to 600 nm, it is preferable that the coloring due to the external deposits described above has absorption in the wavelength region of 360 to 600 nm, because this enhances the bleaching effect of the fiber. Whether the coloring due to the external deposits has absorption in a predetermined wavelength region can be confirmed by reflectance measurement using a spectrophotometer, which will be described later.

[0029] <Coloration due to fiber deterioration> A bleaching method for fiber discoloration due to fiber deterioration, which is assumed to be one of the causes of discoloration, will be described below, but the bleaching method of this embodiment is not limited to the following description. Examples of discoloration due to deterioration of fibers include discoloration due to deterioration of the fiber material itself, and discoloration due to deterioration of fluorescent whitening agents, preservatives, etc. dyed onto the fibers.

[0030] Examples of discoloration due to deterioration of fibers include thermal deterioration, which occurs when fibers are repeatedly dried or ironed, sunburn, which occurs when fibers are affected by ultraviolet rays from sunlight or fluorescent lamps, and photodegradation, which occurs when fluorescent brighteners, preservatives, etc., deteriorate due to the influence of ultraviolet rays. The aforementioned discoloration due to fiber deterioration can occur regardless of the type of fiber, but synthetic fibers such as nylon, and various natural fibers such as wool, cashmere, and other animal hair fibers, and silk tend to be particularly susceptible to the effects of heat and ultraviolet rays. Discoloration due to fiber deterioration tends to be difficult to recover from by bleaching, but the bleaching method of this embodiment can effectively reduce the discoloration.

[0031] (Textile bleaching method) The bleaching method of the present embodiment includes a step of irradiating light having a wavelength of 360 nm to 600 nm in the presence of oxygen. The mechanism by which a bleaching effect is achieved by irradiation with light of wavelengths between 360 and 600 nm is thought to be that the organic components that cause the coloring of the fiber are excited by the light irradiation, and an oxidation reaction occurs between them and oxygen or part of the fiber components, causing them to change into non-colored components and bleach. Note that if the fiber does not absorb the irradiated wavelength, it simply reflects the light of the irradiated wavelength, and does not decompose or deteriorate, so the fiber will not be damaged.

[0032] In the bleaching method of the present embodiment, the light irradiated onto the fiber contains light with a wavelength of 360 to 600 nm, and preferably contains mainly light with a wavelength of 360 to 600 nm. The phrase "mainly including light with a wavelength of 360 to 600 nm" means that the spectral output of light with a wavelength of 360 to 600 nm in the light irradiated onto the object to be irradiated is 50% or more of the total light irradiated. From the viewpoints of suppressing fiber degradation and energy intensity, it is more preferable that the light mainly contains light with a wavelength of 390 to 480 nm, and even more preferable that the light mainly contains light with a wavelength of 400 to 460 nm. From the viewpoint of abundant coloring due to oxidatively decomposable external deposits, it is more preferable that the light mainly contains light with a wavelength of 360 to 390 nm, and even more preferable that the light mainly contains light with a wavelength of 360 to 370 nm.

[0033] In the bleaching method of this embodiment, the light irradiated onto the fiber can be appropriately selected depending on the absorption band of the color of the fiber to be irradiated. The light may be light of a single wavelength or may contain light of multiple wavelengths. Examples include light of a single wavelength or multiple wavelengths within the range of 360 to 600 nm, and light containing light of a single wavelength or multiple wavelengths outside the range of 360 to 600 nm. The irradiated light may contain a small amount of light with a wavelength shorter than 360 nm, but long-term irradiation of high-power short-wavelength light less than 360 nm may cause decomposition of the fibers of the irradiated object or the generation of new coloring, so light containing mainly light with a wavelength of 360 to 600 nm is preferred, and it is preferable to irradiate light that does not contain wavelengths less than 360 nm, and it is more preferable to use a light source that emits only light with a wavelength of 360 to 600 nm. In order to minimize the decomposition of the fibers of the irradiated object and the generation of new coloring, it is preferable, for example, to select a light source that does not contain light with a wavelength of less than 360 nm, or to combine it with a filter that cuts out wavelengths other than the target wavelength. The irradiated light may contain light with a wavelength longer than 600 nm, and the effect of the wavelength of light on the coloring of the irradiated body tends to decrease as the wavelength becomes longer. However, irradiation with light in the infrared region in particular may increase the temperature of the irradiated body itself, making it difficult to control the temperature of the irradiated body, so it is preferable that the irradiated light be only light in the visible light region.

[0034] Among the organic components that cause coloration of fibers, yellow components in particular absorb light in the wavelength range of 390 to 480 nm well, and therefore have a large bleaching effect when irradiated with light in this wavelength range. 1 to 3 show the average gram absorption coefficients in the wavelength range of 400 nm to 500 nm when a predetermined coloring component is irradiated with light having a wavelength of 445 nm. Specifically, Figure 1 shows the average gram absorption coefficients of 3,3',5,5'-tetra-tert-butyl-4,4'-stilbenequinone (TBSQ), a coloring component derived from antioxidants; Figure 2 shows β-carotene, a coloring component found in vegetables and fruits; and Figure 3 shows lycopene, when irradiated with 445 nm light, at 400 to 500 nm. In Figures 1 to 3, the sample is not irradiated with light (before light irradiation), and the integrated light intensity is 3.75 W·hr / cm 2 The UV-vis spectrum of the sample (after irradiation) is shown. As shown in FIGS. 1 to 3, it was found that the average gram absorption coefficient in the wavelength range was significantly reduced after light irradiation.

[0035] In the bleaching method of this embodiment, the output of light irradiated onto the fiber is 0.001 W / cm 2 It is preferable that the power is 0.001 to 10 W / cm or more. 2 It is more preferable that the range is: The output of the irradiation light is 0.001W / cm 2 By satisfying the above conditions, the photoreaction proceeds sufficiently, and the color tone can be sufficiently improved without the need for long-term irradiation. Also, 10W / cm 2 By satisfying the above condition, deterioration of the fiber itself and generation of new coloring components due to photoreaction and thermal reaction can be prevented, and a decrease in the bleaching effect can be effectively suppressed. The output of the irradiation light is 0.005 to 5 W / cm 2 is more preferable, and even more preferable is 0.01 to 3 W / cm 2 Above The output of the irradiated light preferably satisfies the above numerical range over the entire surface of the fiber, and more preferably the light is irradiated so that the light output is uniform over the colored region of the fiber.

[0036] The output of the irradiated light can be measured using a photometer or power meter that uses a photodiode. In addition, by measuring the radiant flux (W), the irradiated area (cm 2The specific output of the irradiated light can be estimated by placing an actinometer or power meter at a location corresponding to the surface of the object to be irradiated with light and measuring the light output. In the above-described light irradiation of the fiber, the light output is preferably constant during irradiation, but may be varied. When the light output is varied, it is preferable to control the light output of the irradiated light so as to satisfy the above-described numerical range. The light irradiated onto the fiber may be irradiated from multiple directions or from a single direction, but from the viewpoint of uniform irradiation, it is preferable to arrange the light source so as to uniformly irradiate the fiber.

[0037] In the bleaching method of this embodiment, the cumulative light intensity of the light irradiated onto the fiber is 0.001 W·hr / cm 2 It is preferable that this is equal to or greater than this. Accumulated light intensity: 0.001 W·hr / cm 2 By satisfying the above conditions, the photoreaction of the coloring component tends to proceed sufficiently, and the bleaching effect tends to proceed sufficiently. The cumulative light intensity of the light irradiated on the fiber is 0.01 W·hr / cm 2 More than 0.1 W·hr / cm is more preferable, and 0.1 W·hr / cm is even more preferable. 2 That's all.

[0038] Regarding the relationship between the cumulative amount of light irradiated onto the fiber and the degree of bleaching, it is preferable to appropriately select the cumulative amount of light depending on the type and magnitude of the coloring, and the desired degree of yellowing and whiteness after bleaching. Figure 4 shows the results of irradiating a sample with 445 nm light at an optical output of 0.36 W / cm with a sample impregnated with an orange-containing beverage (manufactured by Kirin Co., Ltd., product name "Tropicana 100%)), which is a coloring agent used to attach to the fiber. 2 The graph below plots the relationship between the cumulative amount of light and whiteness when the irradiation time is set to 0, 5, 10, 20, 30, 40, 50, 60, 80, 100, 120, 150, and 180 minutes. As shown in Figure 4, it was found that the whiteness improved as the accumulated light intensity increased.

[0039] The integrated light amount for the fiber can be measured using an integrated light meter or a power meter using a photodiode. The integrated light amount can also be calculated using the radiation density (energy density (W / cm 2 )) over time (hr), so if you can measure the radiant flux (W), you can calculate the irradiated area (cm 2 The energy density can be determined by calculating the radiant flux per unit of light, and the cumulative amount of light can be determined by the irradiation time.

[0040] In the bleaching method of this embodiment, the time for irradiating the fiber with light is preferably short from the viewpoint of productivity, but may be long if the irradiated object is irradiated with light during storage. Furthermore, the light irradiation may be performed continuously or discontinuously, but continuous irradiation is preferred from the viewpoint of efficiency. Even in the case of discontinuous light irradiation, the integrated light dose is preferably within the above-mentioned range.

[0041] In the bleaching method of this embodiment, the temperature of the colored fiber to be irradiated in the light irradiation step is preferably in the range of 0°C or higher and lower than 220°C, more preferably in the range of 0°C or higher and lower than 100°C from the viewpoint of suppressing fiber deterioration, and even more preferably 80°C or lower from the viewpoint of preventing burns to the user, and even more preferably 60°C or lower. In particular, by setting the temperature of the irradiated body to 100°C or higher, the photoreaction is promoted and productivity is improved, but problems such as deterioration of the irradiated fiber, resulting in a decrease in physical properties, or scorching of the fiber itself tend to occur. In the bleaching method of the present embodiment, from the viewpoint of suppressing deterioration of the fiber due to temperature rise, it is preferable to carry out the step of irradiating the colored fiber as the irradiated object with light while the fiber is cooled by contacting the cooling unit. The cooling temperature in the cooling unit with which the irradiated object is contacted is preferably 0 to 50°C.

[0042] In the bleaching method of this embodiment, the light source used for light irradiation can be appropriately selected from artificial light sources. Artificial light sources include, but are not limited to, incandescent lamps, fluorescent lamps, halogen lamps, mercury lamps, metal halide lamps, xenon lamps, light-emitting diodes (LEDs), laser light sources, etc. Among these, LEDs and laser light sources are preferred from the viewpoint of irradiating only light with a wavelength of 360 to 600 nm, which is particularly effective in improving color tone. Light sources can also be used in appropriate combinations, taking into account factors such as fiber deterioration due to heating. Natural light such as sunlight can also be selected, but artificial light sources are preferred from the viewpoint of efficiency. If the temperature rise due to light irradiation becomes a problem, deterioration of the fiber due to the temperature rise can be suppressed by installing an infrared cut filter or providing a cooling mechanism using air or water cooling.

[0043] In the bleaching method of the present embodiment, light irradiation is carried out in the presence of oxygen. Here, "in the presence of oxygen" means an environment in which oxygen molecules (O2) are present. For example, the irradiation may be performed in an atmosphere of air, oxygen gas, water vapor, or a solvent, and air is preferred from the viewpoint of cost and convenience. During irradiation, the flow rate of the gas introduced into the light irradiation device may be measured and adjusted as appropriate.

[0044] The bleaching method of the present embodiment can bleach the colored fibers by irradiating them with light without contacting them with a solvent, i.e., in a solvent-free state. However, the bleaching method of the present embodiment is not limited to this form, and the fibers can also be bleached by irradiating them with light while they are in contact with a predetermined solvent. Examples of the solvent include, but are not limited to, water, alcohols, chain or cyclic alkanes, ethers, petroleum-based solvents, and the like. A solvent that transmits light of the irradiation wavelength can be used, and water or alcohols are particularly preferred.

[0045] The bleaching method of the present embodiment does not require the addition of bleaching chemicals, but a solvent may be used during bleaching, and the solvent may contain any additives. Alternatively, a paste-like additive may be applied to the colored fibers without a solvent. Examples of the additives include, but are not limited to, optional components such as bleaching agents, bleach activators, enzymes, surfactants, oxidizing agents, reducing agents, fragrances, inorganic builders, anti-redeposition agents, dispersants, fluorescent coatings, antioxidants, dyes, antibacterial agents, preservatives, antifoaming agents, and polymers. In the bleaching method of this embodiment, a step of washing the fibers may be provided after the light irradiation step, which is preferable because it allows compounds generated by photoreactions or the like to be removed from the fibers and, if an additive is used as described above, allows the additive to be removed from the fibers. Furthermore, when bleaching or washing is carried out using a solvent, a drying step may be carried out afterwards.

[0046] One advantage of the bleaching method of this embodiment is that it can bleach the colored fibers without using a solvent and does not require the addition of bleaching chemicals. When the fibers are, in particular, various animal hair fibers such as wool and cashmere, or natural fibers such as silk, the fibers themselves are weak against water and are not suitable for washing with water, and are prone to deterioration due to chemicals. Therefore, it is beneficial to apply a bleaching method that does not require solvents or chemicals, such as the bleaching method of this embodiment. Furthermore, when the external deposits on the natural fibers are due to human soiling, the fibers and the soiling components have similar chemical structures, and the use of chemicals for bleaching can easily damage the fibers. Therefore, it is extremely beneficial to apply the bleaching method of this embodiment, which does not require chemicals.

[0047] [Bleaching device] The bleaching device of this embodiment has a light irradiating unit that irradiates colored fibers with light having a wavelength of 360 nm to 600 nm in the presence of oxygen. FIG. 5 shows a schematic cross-sectional view of an example of the bleaching device 1 of this embodiment. The bleaching device 1 of the embodiment has a light irradiation unit 2, and the colored fibers are placed in a position facing the light irradiation unit 2. The bleaching device of this embodiment may also be configured to have a light-shielding section at a position that does not obstruct the light irradiation of the colored fibers from the light irradiating section 2. For example, in the bleaching device shown in Fig. 5, the light irradiating section 2 has a top plate 2a and a plurality of lights 2b arranged on the underside of the top plate 2a, and a light-shielding section (shade) 3 is provided to surround the light irradiating section 2.

[0048] The light emitted from the light 2b of the light emitting unit 2 is preferably LED and / or laser light having a wavelength of 360 to 600 nm, and has a light intensity of 0.001 W / cm 2 for the colored fibers. 2 It is preferable that the light irradiation unit 2 is set to irradiate at the above illuminance. The illuminance of the light irradiation unit 2 can be controlled by adjusting the irradiation distance to the fiber to be irradiated or the light output.

[0049] The light-shielding part 3 also functions as a leg supporting the top plate 2a of the light-irradiating part 2, and the colored fiber to be irradiated is placed in the area surrounded by the light-shielding part 2 and irradiated with light, thereby bleaching the fiber. The light-shielding part 3 can be formed of, for example, a metal material, and is preferably made of a metal material because it can prevent the irradiated light from diffusing to the outside and improve irradiation efficiency. The light-shielding part 3 may also be a filter made of a material that blocks only a predetermined wavelength of irradiated light, and may allow the state of light irradiation on the colored fiber to be confirmed. Furthermore, for the purpose of protecting the fibers and accelerating bleaching, it is preferable to wet the colored portion of the fibers with a spray bottle or the like before irradiating it with light.

[0050] The bleaching device of this embodiment may include a control system that adjusts the range, intensity, and wavelength of the irradiated light depending on the type of fabric to be bleached, the type of staining material, the extent of staining, and the degree of staining, such as the time since staining. The control system allows the user to select, for example, the load, type, and degree of staining of the fabric to be bleached, and the light irradiation conditions, thereby enabling more effective bleaching. Another aspect of the control system is the system for selecting bleaching conditions from a number of pre-set parameters, which allows the fabric to be bleached to the desired brightness.

[0051] As shown in FIG. 6, the bleaching device of this embodiment may have a structure in which the light-shielding part 3 is attached to the top plate 2a via a hinge 4, and may be foldable when not in use.

[0052] The bleaching device of this embodiment may be configured such that a cooling unit 5 is provided on the side opposite the light 2b of the light irradiation unit 2, as shown in FIG. In the bleaching device configuration shown in FIG. 7, colored fibers are placed on the cooling unit 5, and are irradiated with light having a wavelength of 360 nm to 600 nm from the light 2b of the light irradiation unit 2. The cooling mechanism in the cooling section 5 is not particularly limited as long as it has the function of preventing the fibers from overheating during bleaching, and examples include water cooling (such as a small chiller), air cooling (such as a cooling fan), evaporative cooling (a mechanism that sprays water or the like to cool using the heat of evaporation), natural cooling (which diffuses heat using a material with high thermal conductivity), and thermoelectric cooling (which cools using the Pelletier effect caused by passing an electric current).

[0053] As mentioned above, using a water-cooled or air-cooled heat sink for the cooling unit 5 has the advantage that heat can be removed without increasing the water vapor concentration around the equipment too much, unlike heat removal using the latent heat of vaporization. If the colored fibers to be bleached are pre-wetted before light irradiation or wetted by spraying water, heat can be removed using the latent heat of vaporization, but this makes it easy for water vapor to fill the space separated by the light 2b and the light-shielding unit 3, and condensation can easily cause malfunctions of the light 2b, etc., so it is preferable to use a means of removing heat without actively wetting the colored fibers. The cooling temperature in the cooling section 5 is not particularly limited as long as the fibers are not overheated during bleaching, and for example, a mechanism that keeps the cooling section 5 at 30°C or less can provide good cooling, and a mechanism that keeps the cooling section 5 at 20°C or less is more preferable. This allows the colored fibers to be cooled to 30°C or less by the cooling section 5, effectively preventing fiber deterioration due to light irradiation.

[0054] FIG. 8(A) shows a schematic cross-sectional view of an example in which a cooling unit 5 is provided on the side of the light emitting unit 2 opposite the light 2b. In FIG. 8(A), the cooling unit 5 comprises a water-cooled heat sink 5a, a cover 5b, a water inlet 5c, and a water outlet 5d. Water at a predetermined temperature is injected into the water-cooled heat sink 5a through the water inlet 5c and discharged from the water outlet 5d, thereby appropriately controlling the cooling temperature. FIG. 8(B) shows a schematic top view of the cover 5b. As shown in Figure 8(B), it is preferable that the cover 5b is partially hollowed out to a predetermined size. Holes and / or grooves are provided on the surface of the cooling unit 5 that comes into contact with the colored fibers. This allows water vapor and / or water to be discharged through the holes and / or grooves, preventing deterioration of the light irradiation unit 2 due to vapor evaporated during light irradiation and preventing water droplets from adhering to the irradiation surface of the light irradiation unit 2, thereby enabling highly efficient photobleaching.

[0055] FIG. 9(A) shows a schematic cross-sectional view of another example in which a cooling unit 5 is provided on the side of the light irradiating unit 2 facing the light 2b. In FIG. 9(A), the cooling unit 5 is configured by an air-cooled heat sink 5e, and is configured so that air at a predetermined temperature can be injected into the air-cooled heat sink 5e and then discharged to the outside. FIG. 9B shows a schematic top view of the air-cooled heat sink 5e. As shown in Figure 9(B), it is preferable that the upper surface of the air-cooled heat sink 5e is partially hollowed out to a predetermined size. This prevents the light irradiation unit 2 from being deteriorated by vapor vaporized during light irradiation, as in the bleaching device configured as shown in Figures 8(A) and (B) above, and also prevents water droplets from the vapor generated from the vapor from adhering to the irradiation surface of the light irradiation unit 2, enabling highly efficient light bleaching.

[0056] FIG. 10(A) shows a schematic cross-sectional view of another example in which a cooling unit 5 is provided on the side of the light irradiating unit 2 facing the light 2b. In FIG. 10(A), the cooling unit 5 is configured by an air-cooled heat sink 5f, and air at a predetermined temperature is allowed to communicate between the inside and outside of the area surrounded by the air-cooled heat sink 5f. FIG. 10(B) shows a schematic top view of the air-cooled heat sink 5f. As shown in Figure 10(B), it is preferable that the upper surface of the air-cooled heat sink 5f is partially hollowed out to a predetermined size. This prevents the light irradiation unit 2 from being deteriorated by vapor vaporized during light irradiation, as in the bleaching device configured as shown in Figures 8(A) and (B) above, and also prevents water droplets from the vapor generated from the vapor from adhering to the irradiation surface of the light irradiation unit 2, enabling highly efficient light bleaching.

[0057] The bleaching device of this embodiment may be configured to include a predetermined heating section. FIG. 11 shows a schematic cross-sectional view of a bleaching device having a heating unit 6 disposed opposite to a light irradiation unit 2. By heating the colored portion of the colored fiber in the heating section 6, the bleaching reaction speed increases, and the bleaching time tends to be shortened. The heating means of the heating unit 6 is not particularly limited, and conventionally known means can be used, for example, a configuration using an electric heating wire, a configuration using steam or hot water, electromagnetic induction heating, or a configuration using infrared and / or microwave heating. 11, the upper surface of the heating unit 6 is preferably covered with a reflective material 7 that has the function of reflecting light from the light irradiation unit 2. Reflecting the light from the light irradiation unit 2 with the reflective material 7 tends to improve bleaching efficiency. Furthermore, by coloring the reflective material 7 in a color that does not absorb the wavelength of the light irradiated from the light irradiation unit 2, heat generation tends to be suppressed, making temperature control easier. 11, a predetermined guard 8 may be provided between the light 2b of the light irradiation unit 2 and the fiber. The guard 8 is made of a material that transmits the irradiated light, and by providing the guard 8, the light irradiation unit 2 can be prevented from being heated by the heat of the heating unit 6, and the light 2b of the light irradiation unit 2 can be protected. Furthermore, the bleaching device of this embodiment is not limited to a configuration in which the cooling unit 5 and the heating unit 6 are provided as in Figures 5 and 6, and may be configured in any case in which the cooling unit 5 is provided as in Figures 7 to 10, in which a predetermined guard 8 is provided between the light 2b of the light irradiation unit 2 and the fibers. When the cooling unit 5 is provided as in Figures 7 to 10, providing the guard 8 can suppress deterioration of the light irradiation unit 2 due to condensation caused by the cooling unit 5 and light scattering due to condensation, protect the light 2b of the light irradiation unit 2, and maintain the illuminance of the light 2b. Furthermore, the bleaching device of this embodiment may be configured with a predetermined lock 9 at the bottom end of the light-shielding part 3, as shown in Fig. 11, whether it is configured with the cooling part 5 as shown in Figs. 7 to 10 or with the heating part 6 as shown in Fig. 11. Examples of the lock 9 include, but are not limited to, a magnetic lock, a roller, etc. The lock 9 may be configured to be provided on only one side, in which case the lock 9 may be a hinge.

[0058] In the bleaching device of this embodiment, the cooling section 5 may be configured to include a predetermined water supply tank and a water spray section. FIG. 12 shows a schematic cross-sectional view of an example of a bleaching apparatus having a cooling section 5 equipped with a water spray section 10. By spraying water onto the fibers from the water spray unit 10 of the cooling unit 5, the heat of vaporization can be used to prevent the fibers from overheating during bleaching, and the output of light irradiated from the light irradiation unit 2 can be increased, which tends to shorten the processing time. From a safety management perspective, it is preferable to set the timer for the light 2b so that it will turn off when the sprayed water has finished evaporating. Furthermore, by providing a guard 8 between the light 2b and the water spray unit 10, water can be prevented from splashing on the light 2b even when sprayed from below.

[0059] 12, a portion of the cooling unit 5 may be hollowed out to a predetermined size. This, like the bleaching device shown in FIGS. 8(A) and 8(B), can prevent deterioration of the light irradiation unit 2 due to vapor vaporized during light irradiation, and can prevent the vapor from adhering to the irradiation surface of the light irradiation unit 2, allowing for highly efficient light bleaching.

[0060] The bleaching device of this embodiment may be configured to include a temperature detector that detects the temperature of the fibers to be irradiated with light, in order to prevent deterioration of the fibers due to heat accumulation in the fibers to be irradiated with light. The temperature detector has a mechanism for causing the light irradiating unit to stop irradiating light in response to the detected temperature, specifically when the temperature exceeds a preset temperature. The temperature detector can be installed at any location without any restrictions as long as it can properly measure the temperature of the fiber that is the target of light irradiation, but it is preferable to install it at a location that is not directly exposed to the irradiated light.

[0061] The bleaching device of this embodiment may be configured as shown in Figure 13, with the bleaching device shown in Figure 11 turned upside down. Also, only one end of the heating unit 6 may be connected to the light-shielding unit 3 with a lock 9 made of a hinge. In the configuration shown in FIG. 13, the colored fiber to be irradiated with light is provided between the heating unit 6 and the guard 8. As shown in FIG. 13, the bleaching device of this embodiment may be configured such that a water spray unit 10 is provided in the heating unit 6 at the top of the device, thereby making it possible to spray hot water and / or steam onto the fibers.

[0062] In the bleaching device of this embodiment, an iron can be used as the heating unit 6. 14 is a schematic cross-sectional view of the bleaching device of this embodiment, in which an iron 11 is used as the heating unit 6. Any conventionally known iron 11 can be used. In the bleaching device configured as shown in Fig. 14, colored fibers 20 to be irradiated with light are sandwiched between the iron 11, which is the heating unit, and the light irradiating unit 2, and the colored fibers are heated while being irradiated with light, thereby bleaching the fibers, as shown in Fig. 15. In a preferred embodiment, the colored fibers 20 are placed so that the colored portion 20a of the colored fibers 20 faces the light 2b of the light irradiating unit 2.

[0063] As shown in Figure 16, the bleaching device of this embodiment may be configured such that reflective material 7 is provided inside the shading section 3 and at the upper end of the light irradiation section 2 to surround the group of lights 2b, and the lights 2b of the light irradiation section are arranged so that the bottom and sides are covered by guards 8. Furthermore, the bleaching device configuration shown in FIG. 16 may further be configured to have a cooling section 5 and a water spray section 10 on both sides of the light irradiation section, as shown in FIG. FIG. 18 shows a schematic front view of the bleaching device having the configuration shown in FIG. 17 and 18, the water spray unit 10 of the cooling unit 5 does not come into direct contact with the colored fibers, allowing it to spray water over a wide area. By providing the cooling unit 5 alongside the lamp 2b of the light irradiation unit 2, heat generation by the lamp 2b during use can be suppressed.

[0064] The bleaching device of this embodiment may be configured as shown in FIG. 19, in which the bleaching device configured as shown in FIGS. 16 and 17 is incorporated as a part of an iron. In such a configuration, it is preferable to use the water absorption tank of the iron in combination with the water supply tank of the cooling unit 5 of the bleaching device of this embodiment. From a safety standpoint, it is preferable to have a mechanism that prevents heating by the iron and light irradiation from being turned on at the same time. [Example]

[0065] Hereinafter, the present embodiment will be described in detail with reference to specific examples and comparative examples, but the present invention is not limited to the following examples and comparative examples in any way. The methods for measuring and evaluating physical properties in the examples and comparative examples are as follows.

[0066] [Measurement method, evaluation method] (1. Evaluation of yellowing and whiteness of sample fabric before and after bleaching) Using sample fabrics obtained in the Examples and Comparative Examples described below before and after bleaching, color tones were measured using a spectrophotometer SD5000 manufactured by Nippon Denshoku Industries Co., Ltd. Specifically, a 5 cm x 5 cm sample cloth before and after bleaching was placed on a spectrocolorimeter, and the reflective color tone YI (yellowing index) and WL (whiteness index) were determined by reflectance measurement. The reflection color tone YI (yellowing index) was calculated from the tristimulus values ​​X, Y, and Z obtained by measurement according to JIS K7105 using the formula YI=100(1.28X-1.06Z) / Y. WL (whiteness) is the tristimulus value L obtained by measurement according to JIS L1916. * , a * , b * Therefore, WL=L * +3a * -3b * was calculated using the formula:

[0067] (2. Evaluation of bleaching effect) The reduction in yellowing of the sample fabric before and after bleaching was calculated using the formula below. Reduction rates of 30% or more were rated as A, 20% or more but less than 30% as B, 10% or more but less than 20% as C, and less than 10% as D. Reduction rate of yellowing [%] = (YI before bleaching or washing - YI after bleaching or washing) / YI before bleaching or washing

[0068] [Light irradiation device] Multiple blue LEDs (NCSC119BT-V1, peak emission wavelength 445 nm) manufactured by Nichia Chemical were mounted on a circuit board and used as the light source for the light irradiation device. The light irradiation device was equipped with a water-cooled heat sink to suppress heat generation from the light source and the irradiation surface, and a chiller was connected to this to provide a cooling mechanism. The LED driving power source was an IT6533D constant current power supply manufactured by ITECH. The light output of the light irradiation device manufactured with the above configuration is approximately 1.25 W / cm at a distance of 10 mm from the light source when an applied current of 20 A is used. 2 A jack was attached inside the device so that the distance from the light source could be changed by adjusting the height. In addition, to prevent the irradiated light from directly or indirectly reaching the human eye, the device was enclosed in a housing to prevent light from leaking outside. The colored sample fabrics obtained in the Examples and Comparative Examples described below were laid out in the light irradiation device, and light was irradiated by the light irradiation device at an output condition of 1 A or 20 A. The distance from the light source to the irradiated object was 10 mm. The temperature of the irradiated object during light irradiation was approximately 30°C.

[0069] Example 1-1 A 5cm x 5cm cotton test cloth CN-11 (manufactured by CFT) that did not contain any fluorescent whitening agent was used as the standard cloth, and 0.5mL of a toluene solution containing 10% by mass of squalene as a coloring component was applied to the standard cloth to create a cloth with soiling components attached. The soiled fabric was air-dried for 10 minutes and then heated at 90°C for 120 hours to prepare a colored sample fabric. The colored sample fabric had a yellowing index of 27.3 and a whiteness index of 34.5%. Using the light irradiation device, the light output was set to 1.25 W / cm for the colored sample fabric. 2 , irradiation time 10 minutes (integrated light intensity 0.2 W·hr / cm 2 ) and irradiated with light while adjusting the temperature by cooling with a water-cooled heat sink so that the temperature of the irradiated surface was 20°C, to obtain a photobleached sample fabric. The resulting photobleached sample fabric had a yellowing index of 16.7, a whiteness index of 64.8%, and a reduction in yellowing index of 39%.

[0070] Example 1-2 A colored sample cloth obtained in the same manner as in Example 1-1 was dipped in water to wet it, thereby obtaining a colored sample cloth of Example 1-2. The other conditions were the same as in Example 1-1, and the fabric was photobleached by irradiating it with light to obtain a photobleached sample fabric.

[0071] Examples 1-3 A colored sample fabric was obtained in the same manner as in Example 1-2. Using the light irradiation device, the light output was set to 1.25 W / cm for the colored sample fabric. 2 , irradiation time 10 minutes (integrated light intensity 0.2 W·hr / cm 2 ) and the colored sample fabric was placed on a glass plate and irradiated with light without cooling to obtain a photobleached sample fabric.

[0072] Examples 1-4 A colored sample fabric was obtained in the same manner as in Example 1-1. The light output for the colored sample fabric was 0.16 W / cm 2 , irradiation time 75 minutes (cumulative light intensity 0.2 W·hr / cm 2 ) and light irradiation was performed while adjusting the temperature by cooling with a water-cooled heat sink so that the temperature on the irradiation surface was 20°C. The other conditions were the same as in Example 1-1, and the fabric was photobleached to obtain a photobleached sample fabric.

[0073] Examples 1-5 A colored sample fabric was obtained in the same manner as in Example 1-1. The colored sample fabric was irradiated with light using the light irradiation device under the condition that the oxygen concentration was reduced to 1% or less by nitrogen flow at a flow rate of 4.0 L / min. Specifically, the colored sample fabric was irradiated with light at a light output of 1.25 W / cm. 2 , irradiation time 10 minutes (integrated light intensity 0.2 W·hr / cm2 ) and irradiated with light while adjusting the temperature by cooling with a water-cooled heat sink so that the temperature of the irradiated surface was 20°C, to obtain a photobleached sample fabric.

[0074] Examples 1-6 A colored sample fabric was obtained in the same manner as in Example 1-1. Using an LED lamp (Kessil PR160L-390, peak emission wavelength 390 nm), the light output to the colored sample fabric was 0.80 W / cm 2 , irradiation time 15 minutes (integrated light intensity 0.2 W·hr / cm 2 ) and light irradiation was performed while the sample was naturally cooled using an aluminum alloy heat sink plate. Photobleaching was carried out under the same conditions as in Example 1-1 above, to obtain a photobleached sample fabric.

[0075] Examples 1-7 A colored sample fabric was obtained in the same manner as in Example 1-1. Using an LED lamp (Kessil PR160L-370, peak emission wavelength 370 nm), the light output to the colored sample fabric was 0.40 W / cm 2 , irradiation time 30 minutes (integrated light intensity 0.2 W·hr / cm 2 ) and light irradiation was performed while the sample was naturally cooled using an aluminum alloy heat sink plate. Photobleaching was carried out under the same conditions as in Example 1-1 above, to obtain a photobleached sample fabric.

[0076] Examples 1-8 A nylon test cloth (manufactured by MFO) was used as the standard cloth. Other conditions were the same as in Example 1-1, and a colored sample fabric was obtained and photobleached to obtain a photobleached sample fabric.

[0077] Examples 1-9 A polyester test cloth (Japanese Standards Association, JIS L0803 compliant) was used as the standard cloth. Other conditions were the same as in Example 1-1, and a colored sample fabric was obtained and photobleached to obtain a photobleached sample fabric.

[0078] Examples 1-10 A silk test cloth (Japanese Standards Association, JIS L0803 compliant) was used as the standard cloth. Other conditions were the same as in Example 1-1, and a colored sample fabric was obtained and photobleached to obtain a photobleached sample fabric.

[0079] Examples 1-11 A wool test cloth (Japanese Standards Association, JIS L0803 compliant) was used as the standard cloth. Other conditions were the same as in Example 1-1, and a colored sample fabric was obtained and photobleached to obtain a photobleached sample fabric.

[0080] Comparative Examples 1-12 A colored sample fabric was obtained in the same manner as in Example 1-11. The colored sample fabric was irradiated with light in the same manner as in Example 1-3 to obtain a photobleached sample fabric.

[0081] Example 2 A toluene solution containing 10% by mass of oleic acid was used as a coloring component. Other conditions were the same as in Example 1-1, and a colored sample fabric was obtained and photobleached to obtain a photobleached sample fabric.

[0082] Example 3 A toluene solution containing 10% by mass of dibutylhydroxytoluene (BHT) was used as a coloring component to obtain a soiled cloth. The light output of the stain-adhered cloth was measured at 150 mW / m using an Eye Super UV Tester (Iwasaki Electric SUV-W161). 2 The fabric was irradiated with light (300-400 nm) for 300 minutes to obtain a colored sample fabric due to discoloration of the soiling components. Photobleaching was carried out under the same conditions as in Example 1-1 above, to obtain a photobleached sample.

[0083] Example 4-1 A 5cm x 5cm cotton test cloth CN-11 (manufactured by CFT) that did not contain any fluorescent whitening agent was immersed in an orange-containing beverage (manufactured by Kirin Co., Ltd., product name "Tropicana 100%"; hereafter referred to as "colored beverage 1") for 30 minutes, and then rinsed with running water for 10 seconds to prepare a stain-adhered cloth. This stain-adhered cloth was then air-dried overnight to prepare a colored sample cloth. Photobleaching was carried out under the same conditions as in Example 1-1 above, to obtain a photobleached sample fabric.

[0084] Example 4-2 A colored sample fabric was obtained in the same manner as in Example 4-1. The colored sample fabric was irradiated with light using the light irradiation device under the condition that the oxygen concentration was reduced to 1% or less by nitrogen flow at a flow rate of 4.0 L / min. Specifically, the colored sample fabric was irradiated with light output of 1.25 W / cm. 2 , irradiation time 10 minutes (integrated light intensity 0.2 W·hr / cm 2 ) and irradiated with light while adjusting the temperature by cooling with a water-cooled heat sink so that the temperature of the irradiated surface was 20°C, to obtain a photobleached sample fabric.

[0085] Example 5 As a coloring component, a tomato-containing beverage (manufactured by KOGOME Co., Ltd., trade name "Kagome Tomato Juice", hereinafter referred to as colored beverage 2) was used. Other conditions were the same as in Example 4-1, and a colored sample fabric was obtained and photobleached to obtain a photobleached sample fabric.

[0086] Example 6 Black tea (tea bag manufactured by Nitto Tea Co., Ltd., brewed according to the package instructions, hereinafter referred to as colored beverage 3) was used as the coloring component. Other conditions were the same as in Example 4-1, and a colored sample fabric was obtained and photobleached to obtain a photobleached sample fabric.

[0087] Example 7 Coffee (instant coffee manufactured by Doutor Co., Ltd., brewed according to the package instructions, hereinafter referred to as colored beverage 4) was used as the coloring component. Other conditions were the same as in Example 4-1, and a colored sample fabric was obtained and photobleached to obtain a photobleached sample fabric.

[0088] Example 8 Warm water containing 1% by mass of ketchup (manufactured by KOGOME Co., Ltd., product name "Kagome Tomato Ketchup", hereinafter referred to as seasoning 1) was used as a coloring component. Other conditions were the same as in Example 4-1, and a colored sample fabric was obtained and photobleached to obtain a photobleached sample fabric.

[0089] Example 9 The colored sample cloth used was a 3cm x 5cm piece cut out from the collar of a cotton dress shirt (manufactured by UNIQLO) worn by an adult male for one year (hereinafter referred to as shirt stain 1). Photobleaching was carried out under the same conditions as in Example 1-1 above, to obtain a photobleached sample fabric.

[0090] Example 10 The colored sample cloth used was a 3cm x 5cm piece cut out from the collar of a cotton dress shirt (manufactured by UNIQLO) worn by an adult male for one year, which was then ironed 10 times with the iron temperature set to "high" (hereafter referred to as "shirt stain 2"). Photobleaching was carried out under the same conditions as in Example 1-1 above, to obtain a photobleached sample fabric.

[0091] Example 11 A nylon test cloth (manufactured by MFO) was used as the standard cloth, and the light output for the standard cloth was measured at 150 mW / m using an Eye Super UV Tester (SUV-W161 manufactured by Iwasaki Electric Co., Ltd.). 2 The fabric was irradiated with light (300 to 400 nm) for 300 minutes (hereinafter referred to as photodegradation condition 1), thereby obtaining a colored sample fabric. Photobleaching was carried out under the same conditions as in Example 1-1 above, to obtain a photobleached sample fabric.

[0092] Example 12 A silk test cloth (Japanese Standards Association, JIS L0803 compliant) was used as the standard cloth. Other conditions were the same as in Example 11, and a colored sample cloth was obtained. The light output was set to 1.25 W / cm. 2 , irradiation time 60 minutes (integrated light intensity 1.3 W·hr / cm 2 ) and irradiated with light while adjusting the temperature by cooling with a water-cooled heat sink so that the temperature of the irradiated surface was 20°C, to obtain a photobleached sample fabric.

[0093] Example 13 A nylon test cloth (manufactured by MFO) was used as a standard cloth, and the standard cloth was heated at 90° C. for 150 hours to obtain a colored sample cloth (hereinafter referred to as heat degradation condition 1). Photobleaching was carried out under the same conditions as in Example 1-1 above, to obtain a photobleached sample fabric.

[0094] Example 14 A silk test cloth (Japanese Standards Association, JIS L0803 compliant) was used as the standard cloth. Other conditions were the same as in Example 13, and a colored sample cloth was obtained. The light output was set to 1.25 W / cm. 2 , irradiation time 60 minutes (integrated light intensity 1.3 W·hr / cm 2 ) and irradiated with light while adjusting the temperature by cooling with a water-cooled heat sink so that the temperature of the irradiated surface was 20°C, to obtain a photobleached sample fabric.

[0095] Comparative Example 1-1 A colored sample fabric was obtained in the same manner as in Example 1-1. The colored sample fabric was washed in a washing machine (manufactured by Toshiba Corporation, product name "ZABOON") using the standard cycle without detergent, with a wash time of 12 minutes, rinsing three times, spin-drying for 6 minutes, using approximately 90 L of water, and a total wash time of 39 minutes (hereinafter referred to as condition 1).

[0096] Comparative Example 1-2 A colored sample fabric was obtained in the same manner as in Example 1-6. The colored sample fabric was washed in water under the above (condition 1) in a washing machine (manufactured by Toshiba Corporation, trade name "ZABOON") without using detergent.

[0097] Comparative Example 2 A colored sample fabric was obtained in the same manner as in Example 2. The colored sample cloth was washed in the same manner as in Comparative Example 1-1.

[0098] Comparative Example 3 A colored sample fabric was obtained in the same manner as in Example 3. The colored sample cloth was washed in the same manner as in Comparative Example 1-1.

[0099] Comparative Example 4 A colored sample fabric was obtained in the same manner as in Example 4-1. The colored sample cloth was washed in the same manner as in Comparative Example 1-1.

[0100] Comparative Example 5 A colored sample fabric was obtained in the same manner as in Example 5. The colored sample cloth was washed in the same manner as in Comparative Example 1-1.

[0101] Comparative Example 6 A colored sample fabric was obtained in the same manner as in Example 6. The colored sample cloth was washed in the same manner as in Comparative Example 1-1.

[0102] Comparative Example 7 A colored sample fabric was obtained in the same manner as in Example 7. The colored sample cloth was washed in the same manner as in Comparative Example 1-1.

[0103] Comparative Example 8 A colored sample fabric was obtained in the same manner as in Example 8. The colored sample cloth was washed in the same manner as in Comparative Example 1-1.

[0104] [Table 1]

[0105] [Table 2]

[0106] [Table 3] [Industrial Applicability]

[0107] The bleaching method and bleaching apparatus of the present invention have industrial applicability in various services such as cleaning services, coin laundry services, workwear washing services, and subscription services, or in commercial business services such as linen services required in places such as factories, hotels, hospitals, restaurants, airports, tourist ships, port facilities, public laundries, casinos, apparel shops, and rental shops. Furthermore, the present invention has industrial applicability as a bleaching method for household use as part of existing devices such as washing machines, dryers, ultrasonic washers, clothing steamers, trouser compresses, steam irons, rinser cleaners, photobeautifying devices, hair dryers, hair irons, hanger-type deodorizers, and dental pen-type irradiators, or as a device dedicated to photobleaching. [Explanation of symbols]

[0108] 1 bleaching equipment 2 Light irradiation unit 2a Top plate 2b Light 3 Light blocking section 4 hinges 5 Cooling section 5a water-cooled heat sink 5b cover 5c water inlet 5d water outlet 5e Air-cooled Heatsink 5f Air-cooled Heatsink 6 Heating section 7 Reflective material 8 Guard 9. Rock 10 Water spray section 11 Iron 20. Fiber 20a Colored part of the fiber

Claims

1. The method includes a step of irradiating the colored fiber with light having a wavelength of 360 to 600 nm in the presence of oxygen. Bleaching method.

2. The light output is 0.001 W / cm 2 That's all. The bleaching method according to claim 1.

3. The colored fibers are colored by external deposits. The bleaching method according to claim 1 or 2.

4. The external deposits are at least one selected from the group consisting of squalene, cholesterol, wax, triglycerides, diglycerides, monoglycerides, fatty acids, proteins, minerals, and microorganisms. The bleaching method according to claim 3.

5. The colored fibers are colored by tanning and / or thermal degradation. The bleaching method according to claim 1 or 2.

6. The colored fibers are animal hair fibers or silk fibers. The bleaching method according to claim 1 or 2.

7. The wavelength of the light is 360 to 390 nm. The bleaching method according to claim 1 or 2.

8. The wavelength of the light is 390 to 480 nm. The bleaching method according to claim 1 or 2.

9. The colored fiber is irradiated with the light without being brought into contact with a solvent. The bleaching method according to claim 1 or 2.

10. The colored fiber is irradiated with the light while in contact with water and / or alcohol. The bleaching method according to claim 1 or 2.

11. The colored fiber is cooled and then irradiated with the light. The bleaching method according to claim 1 or 2.

12. In the step of irradiating light, a light emitting diode light source and / or a laser light source is used. The bleaching method according to claim 1 or 2.

13. A light irradiation unit is provided which irradiates the colored fiber with light having a wavelength of 360 to 600 nm in the presence of oxygen. Bleaching equipment.

14. a guard that transmits the light is provided between the light irradiation unit and the colored fiber; 14. The bleaching device of claim 13.

15. The light was 0.001 W / cm 2 The colored fiber is irradiated with an illuminance of at least 14. The bleaching device of claim 13.

16. A cooling section for cooling the colored fibers is provided.

15. A bleaching device according to claim 13 or 14.

17. The cooling unit cools the colored fiber to 30°C or less.

17. The bleaching device of claim 16.

18. The colored fiber is disposed at a position facing the light irradiation unit, a light-shielding part is provided at a position that does not obstruct light irradiation from the light irradiating part to the colored fiber; 15. A bleaching device according to claim 13 or 14.

19. the cooling unit has a water supply tank and a water spray unit, The water spray unit sprays water onto the colored fibers.

17. The bleaching device of claim 16.

20. the cooling unit is an air-cooled heat sink and / or a water-cooled heat sink, The cooling section has holes and / or grooves on a surface thereof that contacts the colored fibers, Water vapor and / or water are discharged from the holes and / or grooves.

17. The bleaching device of claim 16.

21. a temperature detector for detecting the temperature of the colored fiber; The temperature detector causes the light irradiation unit to stop irradiating light in response to the detected temperature.

17. The bleaching device of claim 16.

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