Bleaching method and bleaching device

Abstract

The invention relates to a bleaching method and a bleaching device. The technical problem to be solved is to provide a bleaching method capable of bleaching coloring of fiber products without high-temperature treatment or use of chemical reagents, and a bleaching device used in the bleaching method. This bleaching method has a step for irradiating colored fibers with light having a wavelength of 360-600 nm in the presence of oxygen.

Description

Technical Field

[0001] This invention relates to bleaching methods and bleaching apparatus. Background Technology

[0002] In recent years, from an environmental protection perspective, there has been increasing demand for curbing resource consumption and reducing environmental impact related to petrochemical products. As a petrochemical product, fiber products require significant energy to produce and are known to generate carbon dioxide emissions during their manufacturing process, thus posing a challenge to the environment. Therefore, efforts have been underway to explore environmentally friendly measures such as waste reduction through the recycling of fiber products and the development of durable fiber products.

[0003] Regarding textile products such as clothing, extending their lifespan can be cited as a means of reducing environmental impact. However, long-term use of textile products can lead to various problems, such as staining due to adhering substances, staining caused by fiber deterioration due to heat or ultraviolet radiation, shrinkage or color fading during washing.

[0004] Among these problems, staining, which is a common issue even in ordinary households, is known to be caused by dirt adhering to clothing or during handling. Examples of substances that cause staining due to these adhering substances include yellowing from sweat or sebum, and stains from colored beverages such as fruit and vegetable juices. In particular, sweat and sebum are often difficult to remove completely through regular washing or detergent use alone. The organic components in these stains accumulate in the fibers over time and are easily oxidized by oxygen in the air, leading to yellowing.

[0005] Antioxidants can be cited as an example of substances that can cause discoloration due to other deposits. These antioxidants are known to yellow, just like sweat and sebum, due to oxidation by oxygen in the air.

[0006] As an antioxidant that adheres to textile products, butylated hydroxytoluene (BHT) is known to migrate from packaging materials and hangers to the fibers during the manufacturing, distribution, and storage of textile products. Although BHT itself is white, it reacts with nitrogen oxides in the atmosphere to form 3,3',5,5'-tetratert-butyl-4,4'-stilbenequinone (TBSQ), a yellow compound. Because this yellow compound is sublimable, it can cause yellowing in any material, regardless of whether it contains BHT.

[0007] In addition, antioxidants are sometimes used as additives to impart deodorizing effects to fiber products (see, for example, Patent Document 1). By mixing antioxidants, fiber products may also become colored over time.

[0008] As a means of solving the problem of coloring of fiber products as described above, it is known to use a bleaching agent for clothing that has a bleaching effect. Since it does not cause color fading even when applied to fiber products that are colored clothing, oxygen-based bleaching agents have become the mainstream bleaching agents for clothing.

[0009] However, because the bleaching power of the aforementioned oxygen-based bleaching cleaners is not high enough, they have the problem of not being able to completely remove the coloring initiating substances.

[0010] In view of this problem, in order to improve the bleaching power of oxygen-based bleaching agents, various additives such as bleaching activators containing organic peroxides and bleaching activation catalysts using metal complexes as catalysts have been researched and disclosed (see, for example, Patent Documents 2-5).

[0011] Existing technical documents

[0012] Patent documents

[0013] Patent Document 1: Japanese Patent Application Publication No. 10-131042

[0014] Patent Document 2: Japanese Patent Application Publication No. 2003-147394

[0015] Patent Document 3: Japanese Patent Application Publication No. 2004-331816

[0016] Patent Document 4: Japanese Patent Application Publication No. 2010-150679

[0017] Patent Document 5: International Publication No. 2012 / 073150 Summary of the Invention

[0018] The problem that the invention aims to solve

[0019] However, the aforementioned techniques for removing the initiating substances of coloring still have shortcomings. To address this issue, other methods for improving bleaching power have been proposed, such as high-temperature treatment bleaching under high-temperature steam and methods using chemical reagents, such as stronger chlorine-based bleaching agents (e.g., hypochlorous acid, dichloroisocyanuric acid). However, the former not only requires enormous energy consumption but also causes significant damage to fiber products, while the latter imposes environmental burdens and, in most cases, causes fading in the fabric.

[0020] In addition, there are the following problems: if the fiber products are not rinsed sufficiently after using strong chemical reagents, the chemical reagent components that adhere to and remain on the fiber products will change over time and cause discoloration, or the fluorescent whitening agent will be removed by the chemical reagents and thus appear yellow.

[0021] Therefore, the object of the present invention is to provide a bleaching method that can bleach the color of fiber products even without high-temperature treatment or the use of chemical reagents, and a bleaching apparatus used in the above-mentioned bleaching method.

[0022] Methods for solving problems

[0023] In order to solve the problems of the prior art, the inventors conducted in-depth research and found that by irradiating the colored fibers with light of a specific wavelength, the colored components of the fibers change into uncolored components, thus completing the present invention.

[0024] That is, the present invention is as follows. [1]

[0026] A bleaching method comprising the following steps:

[0027] Irradiate colored fibers with light containing wavelengths of 360–600 nm in the presence of oxygen. [2]

[0029] The bleaching method described above [1], wherein the output of the light is 0.001 W / cm 2 above. [3]

[0031] The bleaching method described in [1] or [2] above, wherein the dyed fibers are dyed due to external attachments. [4]

[0033] The bleaching method described in [3] above, wherein the external adhering substance is at least one selected from the group consisting of squalene, cholesterol, wax, triglycerides, diglycerides, monoglycerides, fatty acids, proteins, inorganic matter and microorganisms. [5]

[0035] The bleaching method described in [1] or [2] above, wherein the dyed fibers are dyed due to sun exposure and / or heat degradation. [6]

[0037] The bleaching method described in any one of [1] to [5] above, wherein the dyed fiber is animal hair fiber or silk fiber. [7]

[0039] The bleaching method described in any one of [1] to [6] above, wherein the wavelength of the light is 360 to 390 nm. [8]

[0041] The bleaching method described in any one of [1] to [6] above, wherein the wavelength of the light is 390 to 480 nm. [9]

[0043] The bleaching method described in any one of [1] to [8] above, wherein the light is irradiated while the dyed fibers are not in contact with the solvent.

[10]

[0045] The bleaching method described in any one of [1] to [8] above, wherein the light is irradiated while the dyed fibers are in contact with water and / or alcohol.

[11]

[0047] The bleaching method described in any one of [1] to

[10] above, wherein the light is irradiated while the dyed fibers are cooled.

[12]

[0049] The bleaching method as described in any one of [1] to

[11] above, wherein a light-emitting diode light source and / or a laser light source are used in the step of irradiating the light described above.

[13]

[0051] A bleaching device, comprising:

[0052] The light irradiation section irradiates the colored fibers with light containing wavelengths of 360–600 nm in the presence of oxygen.

[14]

[0054] The bleaching apparatus described above

[13] includes a protective element between the light irradiation section and the colored fiber, which allows the light to pass through.

[15]

[0056] The bleaching apparatus described in

[13] or

[14] above, wherein the light is directed at 0.001 W / cm 2 The above illuminance is applied to the dyed fibers.

[16]

[0058] The bleaching apparatus as described in any one of

[13] to

[15] above has the following features:

[0059] The cooling section cools the dyed fibers.

[17]

[0061] The bleaching apparatus described in

[16] above, wherein the cooling unit cools the dyed fibers to below 30°C.

[18]

[0063] The bleaching apparatus as described in any one of

[13] to

[17] above, wherein,

[0064] The colored fibers are positioned opposite the light irradiation section.

[0065] A light-shielding part is provided at a position that does not obstruct the light irradiation from the light-irradiating part to the colored fiber.

[19]

[0067] The bleaching apparatus as described in any one of

[16] to

[18] above, wherein,

[0068] The aforementioned cooling unit includes a water supply tank and a water spray unit.

[0069] The water spray unit described above sprays water onto the dyed fibers.

[20]

[0071] The bleaching apparatus as described in any one of

[16] to

[18] above, wherein,

[0072] The aforementioned cooling unit is an air-cooled radiator and / or a water-cooled radiator.

[0073] Holes and / or grooves are provided on the surface of the cooling section that contacts the colored fibers.

[0074] Water vapor and / or water are discharged from the above-mentioned holes and / or channels. [twenty one]

[0076] The bleaching apparatus as described in any one of

[16] to

[20] above has:

[0077] A temperature detector is used to monitor the temperature of the dyed fibers.

[0078] The temperature detector stops the light irradiation of the light-irradiating part based on the detected temperature.

[0079] The effects of the invention

[0080] According to the present invention, a bleaching method is provided that can bleach the color of fiber products even without high-temperature treatment or the use of chemical reagents, as well as a bleaching apparatus used in the above-described bleaching method. Attached Figure Description

[0081] Figure 1 The image shows an unexposed sample (“before illumination”) with 3,3',5,5'-tetra-tert-butyl-4,4'-stilbene (TBSQ) as a coloring component, attached to the fiber, at a cumulative light intensity of 3.75 W·hr / cm. 2The UV-vis spectrum of a sample irradiated with 445 nm light (“after light irradiation”).

[0082] Figure 2 The image shows a sample without light exposure (“before light exposure”) of the fiber attachments, namely β-carotene, which is the coloring component, at a cumulative light intensity of 3.75 W·hr / cm. 2 The UV-vis spectrum of a sample irradiated with 445 nm light (“after light irradiation”).

[0083] Figure 3 The image shows a sample without light exposure (“before light exposure”) of lycopene, the pigment attached to the fiber and acting as a coloring agent, at a cumulative light intensity of 3.75 W·hr / cm. 2 The UV-vis spectrum of a sample irradiated with 445 nm light (“after light irradiation”).

[0084] Figure 4 The graph shows the relationship between cumulative light intensity and whiteness after irradiating a sample of a citrus beverage (manufactured by Kirin Co., Ltd., trade name "Tropicana 100%)) containing fiber-impregnated material as a coloring agent with 445nm light.

[0085] Figure 5 A schematic cross-sectional view showing an example of the bleaching apparatus of this embodiment is shown.

[0086] Figure 6 A schematic cross-sectional view showing another example of the bleaching apparatus of this embodiment is shown.

[0087] Figure 7 A schematic cross-sectional view is shown showing the configuration of the bleaching apparatus of this embodiment, which includes a cooling section.

[0088] Figure 8 (A) shows a schematic cross-sectional view of an example of a bleaching apparatus in this embodiment that is equipped with a water-cooled radiator as a cooling unit. Figure 8 (B) shows a schematic top view of the water-cooled section.

[0089] Figure 9 (A) shows a schematic cross-sectional view of an example of a bleaching apparatus in this embodiment that is equipped with an air-cooled radiator as a cooling unit. Figure 9 (B) shows a schematic top view of the air cooling section.

[0090] Figure 10 (A) shows a schematic cross-sectional view of another example of the configuration in which an air-cooled radiator is provided as a cooling unit in the bleaching apparatus of this embodiment. Figure 10 (B) shows a schematic top view of the air cooling section.

[0091] Figure 11 A schematic cross-sectional view is shown showing the configuration of the bleaching apparatus of this embodiment, which includes a heating element.

[0092] Figure 12 A schematic cross-sectional view is shown showing the configuration of the bleaching apparatus of this embodiment, which includes a water spray unit.

[0093] Figure 13 A schematic cross-sectional view showing another example of the bleaching apparatus of this embodiment is shown.

[0094] Figure 14 A schematic cross-sectional view of a bleaching device with an iron used in the heating section is shown.

[0095] Figure 15 A schematic cross-sectional view showing how to use a bleaching device that incorporates an iron in its heating element.

[0096] Figure 16 A schematic cross-sectional view showing another example of the bleaching apparatus of this embodiment is shown.

[0097] Figure 17 A schematic cross-sectional view showing another example of the bleaching apparatus of this embodiment is shown.

[0098] Figure 18 A schematic front view showing another example of the bleaching apparatus of this embodiment.

[0099] Figure 19 A schematic front view showing another example of the bleaching apparatus of this embodiment.

[0100] Explanation of symbols

[0101] 1. Bleaching device

[0102] 2 Light irradiation part

[0103] 2a Top plate

[0104] 2b lamp

[0105] 3 shading part

[0106] 4 hinges

[0107] 5. Cooling section

[0108] 5a Water-cooled radiator

[0109] 5b Cover

[0110] 5c Water Inlet

[0111] 5d water outlet

[0112] 5e air cooler

[0113] 5F air cooler

[0114] 6. Heating section

[0115] 7. Reflective materials

[0116] 8 Protective components

[0117] 9 Locking components

[0118] 10 Water Spray Unit

[0119] 11 Iron

[0120] 20 fibers

[0121] 20a Fiber's dyed portion Detailed Implementation

[0122] The following describes in detail the specific embodiments of the present invention (hereinafter referred to as "this embodiment"), but the present invention is not limited to the following description and can be implemented by various modifications within the scope of its key points.

[0123] [Bleaching Method]

[0124] The bleaching method of this embodiment includes a step of irradiating the colored fibers with light containing wavelengths of 360 to 600 nm in the presence of oxygen.

[0125] According to the bleaching method of this embodiment, even without high-temperature treatment or the use of chemical reagents, light only acts on organic components corresponding to the irradiation wavelength, enabling bleaching of color without causing significant damage to the fibers.

[0126] (fiber)

[0127] The fiber to be bleached in the bleaching method of this embodiment is not particularly limited, and any material used as the fiber can be used. Examples include, but are not limited to, natural fibers, synthetic fibers, semi-synthetic fibers, regenerated fibers, or blends of these various fibers. In addition, fiber products made from these fibers, such as fabrics, clothing, bags, and shoes, are also eligible for bleaching in the bleaching method of this embodiment.

[0128] As natural fibers, examples 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 wool fibers (cotton, cotton cloth, kapok, etc.), bast fibers (hemp, flax, jute, etc.) and leaf vein fibers (sisal, etc.).

[0129] Examples of synthetic fibers include, but are not limited to, polyamide fibers (nylon, etc.), polyester fibers (polyester, etc.), polyacrylonitrile fibers (acrylic, etc.), polyurethane fibers (polyurethane, etc.), polyvinyl alcohol fibers (vinylon, etc.), polyvinyl chloride fibers (polyvinyl chloride, etc.), polyvinylidene chloride fibers (vinylene, etc.), and polyolefin fibers (polyethylene, polypropylene, etc.).

[0130] Examples of semi-synthetic fibers include, but are not limited to, cellulose-based fibers (such as acetate fibers) and protein-based fibers (such as Promix fibers).

[0131] Examples of regenerated fibers include, but are not limited to, cellulose-based fibers (viscose fiber, cellulose fiber, cupro fiber, etc.).

[0132] As fiber products, examples include, but are not limited to, men's dress shirts, T-shirts, polo shirts, women's shirts, chinos, suits, casual trousers, skirts, tablecloths, placemats, curtains, bedding, hats, sofas, toilet seat covers, handkerchiefs, towels, knitwear, socks, underwear, leggings, and face masks.

[0133] (coloring)

[0134] The bleaching method of this embodiment uses colored fibers as the bleaching object. The colored fibers may be colored due to external attachments or due to fiber deterioration caused by sun exposure and / or heat degradation.

[0135] <External attachments>

[0136] The following describes the dirt on the fibers caused by external attachments that are assumed to be color-initiating substances, but the bleaching method of this embodiment is not limited to the following description.

[0137] As staining is caused by external deposits, it can be broadly divided into two types: dirt from the human body and dirt from the environment.

[0138] As a form of dirt originating from the human body, examples include sweat, sebum, metabolic waste products from the skin, resident bacteria on the skin, blood, human milk, and excretions. The composition and amount of these substances vary greatly depending on factors such as body part, frequency of wear, season, and individual differences. For example, dirt adhering to collars and undergarments can include squalene, cholesterol (including esters), waxes, 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 in themselves, but can cause the fibers to become colored due to sunlight, heat, or oxidation by air.

[0139] As environmental contaminants, examples include stains caused by cooking or food residues such as animal fats, vegetable oils, fruit juices, colored beverages, and seasonings; stains caused by body care products such as hand creams, body lotions, soaps, moisturizers, sunscreens, and cosmetics; antioxidants from packaging materials or hangers; dust or dirt in the air; and car exhaust.

[0140] The above-mentioned components tend to increase in color and become difficult to clean or bleach when left to stand for a long time in the presence of oil or protein or when they undergo thermal denaturation.

[0141] The bleaching method of this embodiment includes a step of irradiating light with wavelengths ranging from 360 nm to 600 nm. Therefore, when the coloring originating from the aforementioned external attachment has absorption in the wavelength region of 360 to 600 nm, the bleaching effect of the fiber is increased, which is preferable. Whether the coloring originating from the external attachment has absorption in the specified wavelength region can be confirmed by reflectance measurement based on a spectrophotometer, which will be described later.

[0142] <Dyeing caused by fiber deterioration>

[0143] The following describes a bleaching method for staining of fibers caused by fiber deterioration, which is assumed to be one of the causes of staining. However, the bleaching method of this embodiment is not limited to the following description.

[0144] Coloration caused by fiber deterioration can be categorized as coloration caused by deterioration of the fiber material itself, and coloration caused by deterioration of fluorescent whitening agents or preservatives applied to the fiber.

[0145] Coloration caused by fiber deterioration can be exemplified by cases where fibers deteriorate and become colored during repeated drying and ironing (thermal deterioration); cases where fibers deteriorate and become colored due to the influence of ultraviolet rays such as sunlight and fluorescent lamps (sun exposure); cases where optical brighteners, preservatives, etc., deteriorate and become colored due to the influence of ultraviolet rays (photodeterioration); and so on.

[0146] The aforementioned discoloration caused by fiber deterioration can occur regardless of the type of fiber. In particular, synthetic fibers such as nylon, wool, cashmere, other animal hair fibers, silk, and other natural fibers are prone to being affected by heat and ultraviolet radiation. Discoloration caused by fiber deterioration tends to be difficult to recover by bleaching, but the bleaching method according to this embodiment can effectively reduce the discoloration.

[0147] (Bleaching methods for fibers)

[0148] The bleaching method of this embodiment includes a step of irradiating light with wavelengths ranging from 360 nm to 600 nm in the presence of oxygen.

[0149] Regarding the mechanism of bleaching achieved by irradiation with light of wavelengths between 360 and 600 nm, it is believed that light irradiation excites the organic components responsible for the fiber's coloration, causing them to undergo an oxidation reaction with oxygen or a portion of the fiber components, thereby transforming them into non-coloring components and thus achieving bleaching. It should be noted that if the fiber does not absorb the irradiation wavelength, it only reflects the irradiated wavelength, therefore no decomposition or degradation occurs, and the fiber does not break.

[0150] In the bleaching method of this embodiment, the light irradiating the fiber contains light with a wavelength of 360 to 600 nm, preferably light with a wavelength mainly containing 360 to 600 nm.

[0151] It should be noted that "light mainly containing wavelengths of 360-600nm" means that the spectral output of light with wavelengths of 360-600nm in the light irradiating the object is more than 50% of the total irradiated light.

[0152] From the perspective of inhibiting fiber degradation and energy intensity, light mainly containing wavelengths of 390 to 480 nm is preferred, and light mainly containing wavelengths of 400 to 460 nm is even more preferred.

[0153] From the perspective of color richness caused by external attachments that can be oxidized and decomposed, light mainly containing wavelengths of 360 to 390 nm is more preferred, and light mainly containing wavelengths of 360 to 370 nm is even more preferred.

[0154] Furthermore, in the bleaching method of this embodiment, the light irradiated onto the fiber can be appropriately selected based on the absorption band of the coloring of the fiber, which is the irradiated object. The light can be a single wavelength or light containing multiple wavelengths. Examples include light with a single wavelength or multiple wavelengths in the range of 360 to 600 nm, and light containing a single wavelength or multiple wavelengths outside the range of 360 to 600 nm.

[0155] The irradiated light may contain a small amount of light with wavelengths shorter than 360 nm. However, prolonged and continuous irradiation with light of short wavelengths shorter than 360 nm may cause fiber decomposition and recoloring of the irradiated material. Therefore, light primarily containing wavelengths of 360–600 nm is preferred, irradiation without wavelengths shorter than 360 nm is preferable, and using only light with wavelengths of 360–600 nm as the light source is even more desirable. To minimize fiber decomposition and recoloring of the irradiated material, for example, it is preferable to select a light source that irradiates in a manner that does not contain light with wavelengths shorter than 360 nm, or to use filters that can block wavelengths other than the target wavelength.

[0156] The irradiated light may include light with wavelengths longer than 600 nm. The effect of light wavelength on the coloration of the irradiated object tends to disappear more as the wavelength increases. In particular, the temperature of the irradiated object may rise due to the irradiation of light in the infrared region, making temperature control of the irradiated object difficult. Therefore, the irradiation light is preferably only light in the visible light region.

[0157] Among the organic components that cause the coloring of fibers, the yellow component in particular can absorb light in the wavelength range of 390 to 480 nm well, so the bleaching effect is great when irradiated with light in the above wavelength range.

[0158] Figures 1-3 The figure shows the average gamma absorption coefficient in the wavelength range of 400 nm to 500 nm when a specified coloring component is irradiated with light of a wavelength of 445 nm.

[0159] Specifically, Figure 1 The figure shows the average gamma absorption coefficient in the 400–500 nm range when 3,3',5,5'-tetratert-butyl-4,4'-stilbene (TBSQ), a coloring component derived from antioxidants, is irradiated with 445 nm light. Figure 2 The figure shows the average gamma absorption coefficient of β-carotene, a coloring component contained in vegetables or fruits, when irradiated with 445 nm light in the range of 400–500 nm. Figure 3 The figure shows the average gamma absorption coefficient of lycopene in the 400-500 nm range when lycopene is irradiated with 445 nm light.

[0160] Figures 1-3 The image shows the sample before light exposure (without light irradiation), with a cumulative light intensity of 3.75 W·hr / cm². 2 The UV-vis spectrum of a sample irradiated with 445 nm light (after light irradiation).

[0161] like Figures 1-3 As shown, the average gamma absorption coefficient in the above wavelength range decreases significantly after light irradiation.

[0162] In the bleaching method of this embodiment, the light output irradiating the fibers is preferably 0.001 W / cm. 2 The above, and more preferably, is 0.001 to 10 W / cm 2 The range.

[0163] By setting the output of the irradiation light to 0.001 W / cm 2 The above allows for a full light reaction, enabling significant tone improvement without requiring prolonged exposure.

[0164] In addition, by making the output of the irradiation light 10W / cm 2The following methods can prevent the deterioration of the fiber itself due to light and heat reactions, introduce new coloring components, and effectively suppress the reduction of bleaching effect.

[0165] The output of the irradiation light is further preferably 0.005–5 W / cm. 2 More preferably, it is 0.01–3 W / cm 2 .

[0166] The output of the irradiation light preferably meets the above-mentioned numerical range relative to the entire surface of the fiber, and more preferably, the irradiation is carried out in a manner that ensures uniform light output in the colored areas of the fiber.

[0167] The output of the irradiated light can be measured using a photometer with a photodiode, a power meter, etc. Furthermore, the area per unit irradiated area (cm²) can be calculated by measuring the radiant flux (W). 2 The light output of the illumination light can be estimated by setting up a photometer, power meter, etc., at a position corresponding to the surface of the illuminated object and measuring the light output.

[0168] In the aforementioned light irradiation of the fiber, it is preferable that the light output remains constant during irradiation, but it can also vary. When the light output varies, it is preferable to control it in a manner that ensures the light output of the irradiated light meets the aforementioned numerical range. The irradiation light on the fiber can irradiate from multiple directions or from a single direction; from the perspective of uniform irradiation, it is preferable to configure the light source in a manner that ensures uniform irradiation of the fiber.

[0169] In the bleaching method of this embodiment, the cumulative light intensity of the irradiation light on the fibers is preferably 0.001 W·hr / cm. 2 above.

[0170] By setting the cumulative light intensity to 0.001 W·hr / cm 2 The above indicates a tendency for the light reaction of the coloring components to proceed fully and for the bleaching effect to develop fully.

[0171] The cumulative light intensity of the irradiation light on the fiber is more preferably 0.01 W·hr / cm. 2 The above, and more preferably 0.1 W·hr / cm 2 above.

[0172] Furthermore, regarding the relationship between the cumulative amount of light irradiated onto the fiber and the degree of bleaching, the cumulative amount of light is preferably selected appropriately based on the type and size of the coloring, and the degree of yellowing or whiteness after bleaching as the target.

[0173] Figure 4The image shows a sample of a citrus-containing beverage (manufactured by Kirin Co., Ltd., trade name "Tropicana 100%)) containing fiber-impregnated residues as a coloring agent, with a light output of 0.36 W / cm². 2 The graph was obtained by plotting the relationship between cumulative light intensity and whiteness when irradiated with 445nm light for irradiation times of 0 minutes, 5 minutes, 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes, 80 minutes, 100 minutes, 120 minutes, 150 minutes, and 180 minutes.

[0174] like Figure 4 As shown, whiteness increases with the increase of cumulative light intensity.

[0175] It should be noted that the cumulative light intensity of the fiber can be measured using a cumulative light intensity meter or power meter that utilizes a photodiode. Furthermore, since the cumulative light intensity is a measure of radiation density (energy density (W / cm²)... 2 The time (hr) integral value of the radiation flux (W) can be used to calculate the area per unit irradiated (cm²). 2 The energy density can be calculated from the radiation flux, and the cumulative light intensity can be calculated from the irradiation time.

[0176] In the bleaching method of this embodiment, from a productivity perspective, the time for irradiating the fibers with light is preferably short, but if the irradiated object is irradiated with light during storage, it can also be for a long time. Furthermore, light irradiation can be performed continuously or discontinuously; from an efficiency perspective, continuous irradiation is preferred. In the case of discontinuous light irradiation, the cumulative light amount is preferably within the aforementioned numerical range.

[0177] In the bleaching method of this embodiment, the temperature of the colored fiber, which is the irradiated object, is preferably in the range of 0°C or higher and less than 220°C during the light irradiation process. From the perspective of suppressing fiber deterioration, it is more preferably in the range of 0°C or higher and less than 100°C. From the perspective of preventing burns to the user, it is even more preferably 80°C or lower, and even more preferably 60°C or lower. In particular, when the temperature of the irradiated object is 100°C or higher, although it can promote the photoreaction and improve productivity, it tends to cause the following problems: the fiber, which is the irradiated object, deteriorates, its physical properties decreases, or the fiber itself is scorched.

[0178] Furthermore, in the bleaching method of this embodiment, from the perspective of suppressing fiber deterioration caused by temperature rise, it is preferable to perform the light irradiation step while the dyed fiber, which is the irradiated object, is in contact with a cooling section and has been cooled. The cooling temperature of the cooling section in contact with the irradiated object is preferably 0 to 50°C.

[0179] In the bleaching method of this embodiment, the light source used for light irradiation can be appropriately selected as an artificial light source.

[0180] Examples of 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), and laser light sources. Among these, LEDs or laser light sources are preferred, especially considering their high effectiveness in illuminating light with wavelengths of 360–600 nm, which provides superior color tone improvement. Appropriate combinations of light sources can also be used, taking into account factors such as fiber degradation caused by heating. While natural light such as sunlight can also be used, artificial light sources are preferred from an efficiency perspective.

[0181] When temperature rise due to light exposure becomes a problem, an infrared cutoff filter can be installed, or a cooling mechanism can be set up through air cooling or water cooling, thereby suppressing fiber deterioration caused by temperature rise.

[0182] In the bleaching method of this embodiment, light irradiation is performed in the presence of oxygen.

[0183] Here, "in the presence of oxygen" refers to an environment in which oxygen molecules (O2) are present.

[0184] For example, the atmosphere can be any of air, oxygen, water vapor, or solvent; from a cost and convenience perspective, air is preferred. During light irradiation, the flow rate of the gas introduced into the light irradiation device can also be measured and adjusted appropriately.

[0185] The bleaching method of this embodiment can bleach the dyed fibers by irradiation with light in a solvent-free state. On the other hand, the bleaching method of this embodiment is not limited to this method, and bleaching can also be performed by irradiation with light while the fibers are in contact with a specified solvent.

[0186] Examples of solvents include, but are not limited to, water, alcohols, chain or cyclic alkanes, ethers, petroleum-based solvents, etc. Solvents that allow light of the irradiation wavelength to pass through can be used, with water or alcohols being particularly preferred.

[0187] The bleaching method of this embodiment does not require the addition of chemical reagents for bleaching, but solvents can be used during bleaching, and these solvents may contain optional additives. Alternatively, a paste-like additive can be applied to the dyed fibers in a solvent-free state.

[0188] Examples of additives mentioned above include, but are not limited to, optional ingredients such as bleaching agents, bleaching activators, enzymes, surfactants, oxidants, reducing agents, fragrances, inorganic detergents, anti-recontamination agents, dispersants, fluorescent coatings, antioxidants, pigments, antibacterial agents, preservatives, defoamers, and polymers.

[0189] In the bleaching method of this embodiment, a step of cleaning the fibers can be provided after the light irradiation step. This allows compounds generated through photoreaction or the like to be removed from the fibers, and also allows the removal of additives from the fibers if they are used as described above, which is therefore preferable.

[0190] In addition, if bleaching and cleaning are performed using solvents, a drying process can be carried out afterwards.

[0191] One advantage of the bleaching method according to this embodiment is that it allows for the bleaching of the dyed fibers without solvents, eliminating the need for bleaching chemicals. This is particularly advantageous when the fibers are various animal hair fibers such as wool and cashmere, or natural fibers such as silk. Since these fibers are inherently water-sensitive and unsuitable for washing, and are easily degraded by chemical reagents, a bleaching method like the one described in this embodiment, which eliminates the need for solvents and chemical reagents, is beneficial. Furthermore, when the external deposits on the natural fibers originate from human dirt, the fibers and dirt components have similar chemical structures. If chemical reagents are used for bleaching, the fibers are easily damaged. Therefore, the bleaching method of this embodiment, which eliminates the need for chemical reagents, is extremely advantageous.

[0192] [Bleaching Device]

[0193] The bleaching apparatus of this embodiment has a light irradiation section that irradiates the colored fibers with light containing wavelengths of 360 nm to 600 nm in the presence of oxygen.

[0194] Figure 5 A schematic cross-sectional view of an example of the bleaching apparatus 1 of this embodiment is shown in the figure.

[0195] The bleaching apparatus 1 of the embodiment has a light irradiation section 2, and the dyed fibers are disposed at a position opposite to the light irradiation section 2.

[0196] Furthermore, the bleaching apparatus of this embodiment may also be configured to have a light-shielding portion provided at a position that does not obstruct light irradiation from the light irradiation section 2 to the dyed fibers. For example, in Figure 5 In the bleaching apparatus shown, the light irradiation unit 2 has the following configuration: it is equipped with a top plate 2a and a plurality of lamps 2b disposed on the lower surface side of the top plate 2a, and a light shield (light shielding member) 3 is provided in such a way as to surround the light irradiation unit 2.

[0197] The light irradiated by the lamp 2b of the light irradiation unit 2 is preferably an LED and / or laser with a wavelength of 360-600 nm, and preferably at a power of 0.001 W / cm². 2 The above illuminance is set for the method of irradiating the dyed fibers. It should be noted that the illuminance of the light irradiation unit 2 can be controlled by adjusting the irradiation distance up to the fiber being irradiated or by adjusting the light output.

[0198] The light-shielding part 3 also functions as a leg supporting the top plate 2a of the light irradiation part 2. By placing the colored fiber, which is the object of irradiation, within the area surrounded by the light-shielding part 2 and irradiating it with light, the fiber is bleached.

[0199] The light-shielding part 3 can be formed of a metal material, for example. By using a metal material to construct the light-shielding part 3, it is possible to prevent the irradiated light from diffusing to the outside and improve the irradiation efficiency, which is therefore preferred. In addition, the light-shielding part 3 can be a filter made of a material that does not transmit only a specified wavelength of irradiated light, which can also enable it to confirm the irradiation state of the light on the colored fibers.

[0200] In addition, for the purpose of protecting the fibers and promoting bleaching, it is preferable to wet the colored part of the fibers with a spray or similar means and then expose it to light.

[0201] The bleaching apparatus of this embodiment can have a defined control system. Examples of such control systems include those that adjust the range, intensity, and wavelength of the irradiated light based on the type of fiber being bleached, the type of dye, the extent of the dirt, the time elapsed after dyeing, and other factors related to the degree of dirt accumulation. Using such a control system, the user can perform bleaching more effectively by selecting, for example, the load on the fiber being bleached, the type of dirt, the degree of dirt accumulation, and the light irradiation conditions.

[0202] As another type of control system, one example is a system that selects bleaching conditions from a number of preset parameters. This allows fibers to be bleached to the desired whiteness.

[0203] like Figure 6 As shown, the bleaching device of this embodiment is configured such that the light-shielding part 3 is mounted on the top plate 2a via the hinge 4, and can be a foldable structure when not in use.

[0204] like Figure 7 As shown, the bleaching apparatus of this embodiment may be configured such that a cooling section 5 is provided on the opposite side of the lamp 2b of the light irradiation section 2.

[0205] Figure 7In the configuration of the bleaching apparatus shown, the colored fibers are placed on the cooling section 5 and irradiated with light containing wavelengths of 360 nm to 600 nm from the lamp 2b of the light irradiation section 2.

[0206] The cooling mechanism in the cooling section 5 is not particularly limited as long as it has the function of not overheating the fibers during bleaching. Examples include water cooling (small coolers, etc.), air cooling (cooling fans, etc.), evaporative cooling (mechanisms that spray water and use the heat of vaporization for cooling), natural cooling (using materials with high thermal conductivity to diffuse heat), and thermoelectric cooling (using the Peltier effect generated by the flow of current for cooling).

[0207] As described above, when using water cooling or air cooling based on a radiator in the cooling section 5, unlike heat removal based on heat of vaporization, it has the advantage of being able to remove heat without causing the water vapor concentration around the equipment to become too high. If the colored fibers to be bleached are pre-wetted before light irradiation, or if the fibers are wetted by spraying water, heat removal can be performed using heat of vaporization. However, the space divided by the lamp 2b and the light-shielding section 3 is easily filled with water vapor, and condensation can easily cause malfunctions of the lamp 2b, etc. Therefore, it is preferable to use a method that removes heat without actively wetting the aforementioned colored fibers.

[0208] Regarding the cooling temperature in the cooling section 5, there is no particular limitation as long as the bleached fibers do not overheat. For example, as long as the cooling section 5 is at or below 30°C, cooling can be performed well, and a temperature of 20°C or below is preferred. Thus, by cooling the dyed fibers to below 30°C using the cooling section 5, fiber deterioration caused by light exposure can be effectively prevented.

[0209] Figure 8 (A) shows a schematic cross-sectional view of an example in which a cooling section 5 is provided on the opposite side of the lamp 2b of the light irradiation section 2.

[0210] Figure 8 In (A), the cooling unit 5 includes a water-cooled radiator 5a, a cover 5b, a water inlet 5c, and a water outlet 5d. Water at a specified temperature is injected into the water-cooled radiator 5a from the water inlet 5c and discharged from the water outlet 5d, so as to properly control the cooling temperature.

[0211] Figure 8 A schematic top view of cover 5b is shown in (B).

[0212] like Figure 8As shown in (B), a portion of the cover 5b is preferably thinned to a predetermined size. This thinning process refers to the provision of holes and / or grooves on the surface of the cooling section 5 that contacts the dyed fibers. This allows water vapor and / or water to escape from the holes and / or grooves, suppressing deterioration of the light-irradiating section 2 due to vaporized steam during light irradiation, and preventing water droplets from the generated steam from adhering to the irradiated surface of the light-irradiating section 2, thus enabling efficient photobleaching.

[0213] Figure 9 (A) shows a schematic cross-sectional view of another example in which a cooling unit 5 is provided on the opposite side of the lamp 2b of the light irradiation unit 2.

[0214] Figure 9 In (A), the cooling section 5 is composed of an air-cooled radiator 5e, which can inject air at a specified temperature into the air-cooled radiator 5e and exhaust it to the outside.

[0215] Figure 9 A schematic top view of the air-cooled radiator 5e is shown in (B).

[0216] like Figure 9 As shown in (B), a portion of the upper surface of the air-cooled radiator 5e is preferably thinned to a specified size. Therefore, compared with the above... Figure 8 (A) Figure 8 The bleaching apparatus configured in (B) can also suppress the deterioration of the light irradiation section 2 due to vaporization during light irradiation, and can prevent water droplets based on the generated vapor from adhering to the irradiation surface of the light irradiation section 2, thus enabling efficient light bleaching.

[0217] Figure 10 (A) shows a schematic cross-sectional view of another example in which a cooling unit 5 is provided on the opposite side of the lamp 2b of the light irradiation unit 2.

[0218] Figure 10 In (A), the cooling section 5 is composed of an air-cooled radiator 5f, and air at a specified temperature is connected inside and outside the area surrounded by the air-cooled radiator 5f.

[0219] Figure 10 A schematic top view of the air-cooled radiator 5f is shown in (B).

[0220] like Figure 10 As shown in (B), a portion of the upper surface of the air-cooled radiator 5f is preferably thinned to a specified size. Therefore, compared with the above... Figure 8 (A) Figure 8The bleaching apparatus configured in (B) can also suppress the deterioration of the light irradiation section 2 due to vaporization during light irradiation, and can prevent water droplets based on the generated vapor from adhering to the irradiation surface of the light irradiation section 2, thus enabling efficient light bleaching.

[0221] The bleaching apparatus of this embodiment may be configured with a specified heating element.

[0222] Figure 11 The diagram shows a schematic cross-sectional view of a bleaching apparatus in which a heating unit 6 is provided at a position opposite to the light irradiation unit 2.

[0223] By using the heating section 6 to heat the colored portion of the colored fiber, there is a tendency to increase the speed of the bleaching reaction and shorten the bleaching time.

[0224] The heating method of the heating unit 6 is not particularly limited, and existing known methods can be used. For example, configurations that are equipped with electric heating wires, configurations that utilize steam or warm water, configurations that utilize electromagnetic induction heating, and configurations that utilize infrared rays and / or μ waves for heating can be used.

[0225] like Figure 11 As shown, the upper surface of the heating part 6 is preferably coated with a reflective material 7 that has the function of reflecting light from the light irradiation part 2. By using the reflective material 7 to reflect the light from the light irradiation part 2, there is a tendency to improve the bleaching efficiency. It should be noted that by making the reflective material 7 a color that does not absorb the wavelength of the irradiated light from the light irradiation part 2, there is a tendency to suppress heat generation and make temperature control easier.

[0226] In addition, such as Figure 11 As shown, a predetermined protective member 8 can be provided between the lamp 2b of the light irradiation section 2 and the fiber. The protective member 8 is made of a material that allows the irradiated light to pass through. By providing the protective member 8, it is possible to prevent the light irradiation section 2 from being heated by the heat from the heating section 6, and thus protect the lamp 2b of the light irradiation section 2.

[0227] Furthermore, the bleaching apparatus of this embodiment is as follows: Figures 5-6 That is not limited to the configuration of cooling section 5 and heating section 6, such as Figures 7-10 In any case where a cooling section 5 is provided, a predetermined protective member 8 can be provided between the lamp 2b of the light irradiation section 2 and the fiber. Figures 7-10 When the cooling section 5 is provided, by providing the protective member 8, the deterioration of the light irradiation section 2 caused by condensation generated by the cooling section 5 and the light scattering caused by condensation can be suppressed, the lamp 2b of the light irradiation section 2 can be protected, and the illuminance of the lamp 2b can be maintained.

[0228] Furthermore, the bleaching apparatus of this embodiment is in Figures 7-10 The configuration includes a cooling section 5, such as... Figure 11 In any configuration where the heating element 6 is provided, it is as follows: Figure 11 The diagram shows a configuration in which a locking element 9 is provided at the lower end of the light-shielding portion 3. Examples of locking elements 9 include, but are not limited to, magnetic locks and roller locks. Alternatively, the locking element 9 may be provided only on one side; in this case, the locking element 9 may be a hinge.

[0229] The bleaching apparatus of this embodiment can be configured such that the cooling unit 5 has a specified water supply tank and a water spray unit.

[0230] Figure 12 A schematic cross-sectional view of an example of a bleaching device having a cooling section 5 equipped with a water spray section 10 is shown.

[0231] By spraying water from the water spray section 10 of the cooling section 5 onto the fibers, it is possible to suppress overheating of the fibers during bleaching due to heat of vaporization, and there is a tendency to increase the output of light irradiated from the light irradiation section 2 and shorten the processing time. Setting a timer for the lamp 2b to cut off the sprayed water before it evaporates completely is a preferred method for safety management. It should be noted that by providing a protective member 8 between the lamp 2b and the water spray section 10, water splashing onto the lamp 2b can be prevented even when water is sprayed from below.

[0232] In addition, Figure 12 In the bleaching apparatus shown, the cooling section 5 can also be constructed by thinning a portion of it to a predetermined size. Therefore, compared with... Figure 8 (A) Figure 8 Similarly, the bleaching apparatus configured in (B) can suppress the deterioration of the light irradiation section 2 due to vaporized vapor during light irradiation, and can prevent the generated vapor from adhering to the irradiation surface of the light irradiation section 2, thus enabling efficient light bleaching.

[0233] From the perspective of preventing the deterioration of fibers that are subject to light irradiation due to heat accumulation, the bleaching apparatus of this embodiment can be configured to have a temperature detector that detects the temperature of the fibers subject to light irradiation.

[0234] The temperature detector described above has a mechanism that stops the light irradiation of the light irradiation unit when the detected temperature exceeds a preset temperature.

[0235] The temperature detector can be placed anywhere as long as it can properly measure the temperature of the fiber being irradiated by light, but it is preferred to place it in a location where the light does not directly irradiate it.

[0236] like Figure 13 As shown, the bleaching apparatus of this embodiment can be used to... Figure 11 The bleaching device shown is configured by reversing the vertical position. Alternatively, it can be configured such that only one end of the heating unit 6 is connected to the light-shielding unit 3 using a locking member 9 made of a hinge.

[0237] exist Figure 13 In the configuration shown, the colored fibers of the object to be irradiated by light are disposed between the heating part 6 and the protective member 8.

[0238] like Figure 13 As shown, the bleaching apparatus of this embodiment can be configured such that a water spray unit 10 is provided in the heating unit 6 at the top of the apparatus, thereby enabling the spraying of warm water and / or steam onto the fibers.

[0239] In the bleaching apparatus of this embodiment, an iron can be used as the heating unit 6.

[0240] Figure 14 The diagram shows a schematic cross-sectional view of the bleaching apparatus of this embodiment, in which an iron 11 is used as the heating element 6. Any conventionally known iron can be used for the iron 11.

[0241] exist Figure 14 In the bleaching apparatus shown, such as Figure 15 As shown, colored fibers 20, which are the objects of light irradiation, can be sandwiched between the iron 11, which serves as the heating unit, and the light irradiation unit 2. The colored fibers are heated while being irradiated with light to perform bleaching. It is preferable to arrange the colored fibers 20 with the colored portion 20a of the colored fibers 20 facing the lamp 2b side of the light irradiation unit 2.

[0242] like Figure 16 As shown, the bleaching apparatus of this embodiment may also be configured such that reflective material 7 is provided inside the light-shielding part 3 and at the upper end of the light-irradiating part 2 in a manner that surrounds the light 2b group, and the light 2b of the light-irradiating part is arranged such that the lower surface and the side surface are covered by protective member 8.

[0243] In addition, Figure 16 In the configuration of the bleaching apparatus shown, it is possible to further... Figure 17 The diagram shows a configuration in which a cooling section 5 and a water spray section 10 are provided on both sides of the light irradiation section.

[0244] Figure 18 The middle shows Figure 17 A schematic front view of the bleaching apparatus shown.

[0245] Figure 17 and Figure 18In the bleaching apparatus shown, the water spray section 10 of the cooling section 5 does not directly contact the dyed fibers, allowing for a wide-area water spraying. By arranging the cooling section 5 alongside the lamp 2b of the light irradiation section 2, the heat generated by the lamp 2b during use can be suppressed.

[0246] like Figure 19 As shown, the bleaching apparatus of this embodiment can also be a combination of... Figure 16 and Figure 17 The bleaching device shown is assembled as a component of an iron.

[0247] In this configuration, it is preferable to use a structure that combines the water absorption tank of the iron with the water supply tank of the cooling section 5 of the bleaching device in this embodiment. From a safety perspective, it is preferable to have a mechanism that prevents the iron's heating and light irradiation from starting simultaneously.

[0248] Example

[0249] The following specific embodiments and comparative examples illustrate this implementation in detail, but the present invention is not limited to the following embodiments and comparative examples.

[0250] The methods for determining and evaluating the physical properties in the examples and comparative examples are described below.

[0251] [Measurement methods, evaluation methods]

[0252] (1. Evaluation of yellowing and whiteness of sample fabrics before and after bleaching)

[0253] Using the sample fabrics obtained before and after bleaching in the examples and comparative examples described later, the hue was measured using a spectrophotometer SD5000 manufactured by Nippon Denshoku Kogyo Co., Ltd.

[0254] Specifically, 5cm×5cm samples of fabric before and after bleaching were placed on a spectrophotometer, and the reflectance hue YI (yellowing degree) and WL (whiteness) were determined by reflection measurement.

[0255] It should be noted that, regarding the reflected hue YI (yellowness), according to JIS K7105, the yellowness is calculated using the formula YI = 100(1.28X - 1.06Z) / Y based on the measured tri-stimulus values ​​X, Y, and Z.

[0256] In addition, regarding WL (whiteness), according to JIS L1916, it is based on the trichromatic stimulus values ​​L obtained through measurement. * a * b * From the calculation formula WL=L * +3a * -3b* Determine the whiteness level.

[0257] (2. Determining the bleaching effect)

[0258] The reduction rate of yellowing of the sample fabric before and after bleaching is calculated using the following formula. Sample fabrics with a reduction rate of 30% or more are rated as A, those with a reduction rate of 20% or more but less than 30% are rated as B, those with a reduction rate of 10% or more but less than 20% are rated as C, and those with a reduction rate of less than 10% are rated as D.

[0259] Yellowing reduction rate [%) = (YI before bleaching or washing - YI after bleaching or washing) / YI before bleaching or washing

[0260] [Light Irradiation Device]

[0261] Multiple NCSC119BT-V1 LED chips (peak emission wavelength 445nm) manufactured by Nichia Chemical were mounted on a substrate as the light source for the light irradiation device. A water-cooled heat sink was installed in the light irradiation device to suppress heat generation from the light source and the irradiated surface, and was connected to a cooler to provide a cooling mechanism. Additionally, an IT6533D constant current power supply manufactured by ITECH was used as the LED driver.

[0262] Regarding the light output of the light irradiation device fabricated using the above-described configuration, at a distance of 10 mm from the light source under an applied current of 20 A, the light output is approximately 1.25 W / cm². 2 A set screw is installed inside the device to change the distance from the light source by adjusting its height. Furthermore, to prevent the irradiated light from directly or indirectly entering the eyes, the device is enclosed in a housing to prevent light leakage to the outside.

[0263] The colored sample fabric obtained in the embodiments and comparative examples described later was spread in the light irradiation device described above, and irradiated with light under the condition of applying a current of 1A or 20A, thereby obtaining an irradiated body. It should be noted that the distance from the light source to the irradiated body is 10mm. In addition, the temperature of the irradiated body during the light irradiation is about 30°C.

[0264] [Example 1-1]

[0265] A 5cm x 5cm cotton test cloth CN-11 (manufactured by CFT Company) without fluorescent whitening agent was used as a standard cloth. 0.5mL of toluene solution containing 10% by mass squalene as a coloring agent was applied to the standard cloth to create a cloth with the attached dirt.

[0266] The cloth with the dirt attached was air-dried for 10 minutes and then heated at 90°C for 120 hours to produce a colored sample cloth.

[0267] The yellowing degree of the above-mentioned colored sample fabric is 27.3, and the whiteness is 34.5%.

[0268] Using the aforementioned light irradiation device, for the colored sample cloth, the light output is 1.25 W / cm². 2 The irradiation time is 10 minutes (cumulative light intensity 0.2 W·hr / cm). 2 The temperature of the irradiated surface was adjusted by using a water-cooled radiator to cool the surface while simultaneously irradiating it with light to obtain a photobleached sample cloth.

[0269] The obtained photobleached sample fabric had a yellowing degree of 16.7, a whiteness of 64.8%, and a yellowing reduction rate of 39%.

[0270] [Examples 1-2]

[0271] The colored sample cloth obtained using the same method as in [Example 1-1] was immersed in water to make it wet, and was used as the colored sample cloth in Example 1-2.

[0272] Regarding other conditions, the same method as described in [Example 1-1] was used to perform photobleaching by light irradiation to obtain a photobleached sample cloth.

[0273] [Examples 1-3]

[0274] The colored sample cloth was obtained using the same method as described in [Examples 1-2] above.

[0275] Using the aforementioned light irradiation device, the light output for the colored sample cloth was set to 1.25 W / cm². 2 The irradiation time is 10 minutes (cumulative light intensity 0.2 W·hr / cm). 2 The colored sample is placed on a glass plate and irradiated with light without cooling to obtain a photobleached sample cloth.

[0276] [Examples 1-4]

[0277] The colored sample cloth was obtained using the same method as described in [Example 1-1].

[0278] The light output relative to the colored sample cloth was set to 0.16 W / cm. 2 The irradiation time was 75 minutes (cumulative light intensity 0.2 W·hr / cm). 2 The temperature is adjusted by using a water-cooled radiator to keep the temperature of the irradiated surface at 20°C while the light is irradiated.

[0279] Photobleaching was performed using the same methods as in [Example 1-1] above, under the same conditions, to obtain a photobleached sample cloth.

[0280] [Examples 1-5]

[0281] The colored sample cloth was obtained using the same method as described in [Example 1-1].

[0282] The aforementioned colored sample fabric was irradiated using the aforementioned light irradiation device under conditions where the oxygen concentration was reduced to below 1% by purging with nitrogen at a flow rate of 4.0 L / min. Specifically, for the colored sample fabric, the light output was set to 1.25 W / cm². 2 The irradiation time is 10 minutes (cumulative light intensity 0.2 W·hr / cm). 2 The temperature of the irradiated surface was adjusted by using a water-cooled radiator to cool it to 20°C, while simultaneously irradiating it with light to obtain a photobleached sample cloth.

[0283] [Examples 1-6]

[0284] The colored sample cloth was obtained using the same method as described in [Example 1-1].

[0285] Using an LED light (Kessil PR160L-390, peak emission wavelength 390nm), the light output was set to 0.80W / cm² for the colored sample cloth. 2 The irradiation time is 15 minutes (cumulative light intensity 0.2 W·hr / cm). 2 It is cooled naturally by an aluminum alloy heat sink while being exposed to light.

[0286] Photobleaching was performed using the same methods as in [Example 1-1] above, under the same conditions, to obtain a photobleached sample cloth.

[0287] [Examples 1-7]

[0288] The colored sample cloth was obtained using the same method as described in [Example 1-1].

[0289] Using an LED light (Kessil PR160L-370, peak emission wavelength 370nm), the light output relative to the colored sample fabric was 0.40W / cm². 2 The irradiation time is 30 minutes (cumulative light intensity 0.2 W·hr / cm). 2 It is cooled naturally by an aluminum alloy heat sink while being exposed to light.

[0290] Photobleaching was performed using the same methods as in [Example 1-1] above, under the same conditions, to obtain a photobleached sample cloth.

[0291] [Examples 1-8]

[0292] As a standard fabric, a test fabric made of nylon (manufactured by MFO) was used.

[0293] The colored sample cloth was obtained using the same method as in [Example 1-1] under the same conditions, and then photobleached to obtain the photobleached sample cloth.

[0294] [Examples 1-9]

[0295] As a standard fabric, a test fabric made of polyester was used (Japan Standards Association, according to JIS L0803).

[0296] The colored sample cloth was obtained using the same method as in [Example 1-1] under the same conditions, and then photobleached to obtain the photobleached sample cloth.

[0297] [Examples 1-10]

[0298] As a standard fabric, a test fabric made of silk was used (Japan Standards Association, based on JIS L0803).

[0299] The colored sample cloth was obtained using the same method as in [Example 1-1] under the same conditions, and then photobleached to obtain the photobleached sample cloth.

[0300] [Examples 1-11]

[0301] As a standard fabric, a test fabric made of wool was used (Japan Standards Association, based on JIS L0803).

[0302] The colored sample cloth was obtained using the same method as in [Example 1-1] under the same conditions, and then photobleached to obtain the photobleached sample cloth.

[0303] [Comparative Examples 1-12]

[0304] The colored sample cloth was obtained using the same method as described in [Examples 1-11] above.

[0305] The above-mentioned colored sample cloth was subjected to light irradiation using the same method as in [Examples 1-3] to obtain a light-bleached sample cloth.

[0306] [Example 2]

[0307] A toluene solution containing 10% by mass of oleic acid as the coloring agent was used.

[0308] The colored sample cloth was obtained using the same method as in [Example 1-1] under the same conditions, and then photobleached to obtain the photobleached sample cloth.

[0309] [Example 3]

[0310] A toluene solution containing 10% by mass dibutylhydroxytoluene (BHT) as a coloring agent was used to obtain a fabric with attached dirt components.

[0311] For fabrics with contaminated surfaces, the Eye Super UV Tester (SUV-W161 manufactured by Iwasaki Electric Co., Ltd.) was used, with a light output of 150mW / m. 2 The cloth was irradiated with light at a wavelength of 300-400 nm for 300 minutes to obtain a colored sample cloth with a color change based on the dirt composition.

[0312] Photobleaching was performed using the same methods as in [Example 1-1] above, under the same conditions, to obtain photobleached samples.

[0313] [Example 4-1]

[0314] A 5cm x 5cm cotton test cloth CN-11 (manufactured by CFT Corporation) without fluorescent whitening agent was soaked in a citrus beverage (manufactured by Kirin Corporation, trade name "Tropicana 100%", hereinafter referred to as coloring beverage 1) for 30 minutes, and then rinsed with running water for 10 seconds to create a cloth with attached dirt. The cloth with attached dirt was then air-dried overnight to create a colored sample cloth.

[0315] Photobleaching was performed using the same methods as in [Example 1-1] above, under the same conditions, to obtain a photobleached sample cloth.

[0316] [Example 4-2]

[0317] The colored sample cloth was obtained using the same method as described in [Example 4-1].

[0318] The aforementioned colored sample fabric was irradiated using the aforementioned light irradiation device under conditions where the oxygen concentration was reduced to below 1% by purging with nitrogen at a flow rate of 4.0 L / min. Specifically, for the colored sample fabric, the light output was set to 1.25 W / cm². 2 The irradiation time is 10 minutes (cumulative light intensity 0.2 W·hr / cm). 2 The temperature of the irradiated surface was adjusted by using a water-cooled radiator to cool it to 20°C, while simultaneously irradiating it with light to obtain a photobleached sample cloth.

[0319] [Example 5]

[0320] As a coloring ingredient, a tomato-containing beverage (manufactured by KOGOME Corporation, trade name "Kagome TomatoJuice", hereinafter referred to as coloring beverage 2) was used.

[0321] The colored sample cloth was obtained using the same method as in [Example 4-1] under the same conditions, and then photobleached to obtain the photobleached sample cloth.

[0322] [Example 6]

[0323] As a coloring ingredient, black tea is used (made by brewing tea bags manufactured by Nitto Black Tea Co., Ltd. according to the instructions on the packaging, hereinafter referred to as coloring beverage 3).

[0324] The colored sample cloth was obtained using the same method as in [Example 4-1] under the same conditions, and then photobleached to obtain the photobleached sample cloth.

[0325] [Example 7]

[0326] As a coloring ingredient, coffee (made by brewing instant coffee manufactured by Doutor Company according to the instructions on the packaging, hereinafter referred to as coloring beverage 4) is used.

[0327] The colored sample cloth was obtained using the same method as in [Example 4-1] under the same conditions, and then photobleached to obtain the photobleached sample cloth.

[0328] [Example 8]

[0329] As a coloring ingredient, warm water containing 1% by mass of tomato paste (manufactured by KOGOME Corporation, trade name "KagomeTomato Ketchup", hereinafter referred to as seasoning 1) was used.

[0330] The colored sample cloth was obtained using the same method as in [Example 4-1] under the same conditions, and then photobleached to obtain the photobleached sample cloth.

[0331] [Example 9]

[0332] As a sample fabric for coloring, a 3cm x 5cm sample was obtained by cutting off the collar of a cotton formal shirt (manufactured by UNIQLO) worn by an adult male for one year (hereinafter referred to as shirt stain 1).

[0333] Photobleaching was performed using the same methods as in [Example 1-1] above, under the same conditions, to obtain a photobleached sample cloth.

[0334] [Example 10]

[0335] As a sample fabric for coloring, a 3cm x 5cm piece was cut from the collar of a cotton dress shirt (manufactured by UNIQLO) worn by an adult male for one year. The iron was set to "high" and ironed 10 times. The resulting sample was used (hereinafter referred to as shirt stain 2).

[0336] Photobleaching was performed using the same methods as in [Example 1-1] above, under the same conditions, to obtain a photobleached sample cloth.

[0337] [Example 11]

[0338] As the standard fabric, a test fabric made of nylon (manufactured by MFO Corporation) was used, and an Eye Super UV Tester (SUV-W161 manufactured by Iwasaki Electric Corporation) was used to achieve a light output of 150mW / m for the standard fabric. 2 The sample cloth was irradiated with light for 300-400 nm for 300 minutes (hereinafter referred to as light degradation condition 1) to obtain the colored sample cloth.

[0339] Photobleaching was performed using the same methods as in [Example 1-1] above, under the same conditions, to obtain a photobleached sample cloth.

[0340] [Example 12]

[0341] As a standard fabric, a test fabric made of silk was used (Japan Standards Association, based on JIS L0803).

[0342] The colored sample cloth was obtained using the same process as in [Example 11] under the same conditions, with the light output set to 1.25 W / cm. 2 The irradiation time is 60 minutes (cumulative light intensity 1.3 W·hr / cm). 2 The temperature of the irradiated surface was adjusted by using a water-cooled radiator to cool it to 20°C, while simultaneously irradiating it with light to obtain a photobleached sample cloth.

[0343] [Example 13]

[0344] As a standard fabric, a test fabric made of nylon (manufactured by MFO Corporation) was used. The above standard fabric was heated at 90°C for 150 hours to obtain a colored sample fabric (hereinafter referred to as thermal degradation condition 1).

[0345] Photobleaching was performed using the same methods as in [Example 1-1] above, under the same conditions, to obtain a photobleached sample cloth.

[0346] [Example 14]

[0347] As the standard fabric, a test fabric made of silk was used (Japan Standards Association, in accordance with JIS L0803 standard).

[0348] The colored sample cloth was obtained using the same process as in [Example 13] under the same conditions, with the light output set to 1.25 W / cm. 2 The irradiation time is 60 minutes (cumulative light intensity 1.3 W·hr / cm).2 The temperature of the irradiated surface was adjusted by using a water-cooled radiator to cool it to 20°C, while simultaneously irradiating it with light to obtain a photobleached sample cloth.

[0349] [Comparative Example 1-1]

[0350] The colored sample cloth was obtained using the same method as described in [Example 1-1].

[0351] For the above-mentioned colored sample fabric, a washing machine (manufactured by TOSHIBA, trade name "ZABOON") was used to wash the fabric without detergent using the standard program of 12 minutes of washing, 3 rinses, 6 minutes of spin-drying, using approximately 90L of water, and a total washing time of 39 minutes (hereinafter referred to as Condition 1).

[0352] [Comparative Examples 1-2]

[0353] The colored sample cloth was obtained using the same method as described in [Examples 1-6] above.

[0354] For the above-mentioned colored sample fabric, under the above (condition 1), it was washed with water using a washing machine (manufactured by TOSHIBA, trade name "ZABOON") without the use of detergent.

[0355] [Comparative Example 2]

[0356] The colored sample cloth was obtained using the same method as described in [Example 2] above.

[0357] The colored sample cloth described above was cleaned using the same method as in [Comparative Example 1-1].

[0358] [Comparative Example 3]

[0359] The colored sample cloth was obtained using the same method as described in [Example 3].

[0360] The colored sample cloth described above was cleaned using the same method as in [Comparative Example 1-1].

[0361] [Comparative Example 4]

[0362] The colored sample cloth was obtained using the same method as described in [Example 4-1].

[0363] The colored sample cloth described above was cleaned using the same method as in [Comparative Example 1-1].

[0364] [Comparative Example 5]

[0365] The colored sample cloth was obtained using the same method as described in [Example 5] above.

[0366] The colored sample cloth described above was cleaned using the same method as in [Comparative Example 1-1].

[0367] [Comparative Example 6]

[0368] The colored sample cloth was obtained using the same method as described in [Example 6].

[0369] The colored sample cloth described above was cleaned using the same method as in [Comparative Example 1-1].

[0370] [Comparative Example 7]

[0371] The colored sample cloth was obtained using the same method as described in [Example 7].

[0372] The colored sample cloth described above was cleaned using the same method as in [Comparative Example 1-1].

[0373] [Comparative Example 8]

[0374] The colored sample cloth was obtained using the same method as described in [Example 8].

[0375] The colored sample cloth described above was cleaned using the same method as in [Comparative Example 1-1].

[0376]

[0377]

[0378]

[0379] Industrial applicability

[0380] The bleaching method and bleaching apparatus of the present invention have industrial applicability in various services such as cleaning services, coin-operated laundry services, work clothes cleaning services, ordering services, or commercial services such as clothing services required in places such as factories, hotels, hospitals, restaurants, airports, sightseeing boats, port facilities, public laundries, entertainment venues, clothing stores, and rental shops.

[0381] In addition, as a household application, it has industrial applicability as a bleaching method and a device specifically designed for photobleaching, which is part of existing devices such as washing machines, dryers, ultrasonic cleaners, clothing steamers, trouser presses, steam irons, rinsing cleaners, beauty containers, hair dryers, hair curlers, hanger-type deodorizers, and dental pen-type irradiators.

Claims

1. A bleaching method comprising the following steps: The colored fiber is irradiated with light containing wavelengths of 360 nm to 600 nm in the presence of oxygen.

2. The bleaching method as described in claim 1, wherein, The light output is 0.001 W / cm². 2 above.

3. The bleaching method as described in claim 1 or 2, wherein, The colored fibers are colored due to external attachments.

4. The bleaching method as described in claim 3, wherein, The external attachment is at least one selected from the group consisting of squalene, cholesterol, wax, triglycerides, diglycerides, monoglycerides, fatty acids, proteins, inorganic matter, and microorganisms.

5. The bleaching method as described in claim 1 or 2, wherein, The colored fibers became colored due to sun exposure and / or heat degradation.

6. The bleaching method as described in claim 1 or 2, wherein, The dyed fibers are animal hair fibers or silk fibers.

7. The bleaching method as described in claim 1 or 2, wherein, The wavelength of the light is 360nm to 390nm.

8. The bleaching method as described in claim 1 or 2, wherein, The wavelength of the light is 390nm to 480nm.

9. The bleaching method as described in claim 1 or 2, wherein, The colored fibers are irradiated with light while remaining in contact with the solvent.

10. The bleaching method as described in claim 1 or 2, wherein, The colored fibers are irradiated with light while in contact with water and / or alcohol.

11. The bleaching method as described in claim 1 or 2, wherein, The colored fibers are irradiated with light while they are cooled.

12. The bleaching method as described in claim 1 or 2, wherein, In the process of irradiating the light, a light-emitting diode light source and / or a laser light source are used.

13. A bleaching apparatus, comprising: The light irradiation section irradiates the colored fibers with light of wavelengths ranging from 360 nm to 600 nm in the presence of oxygen.

14. The bleaching apparatus as claimed in claim 13, wherein, A protective element is provided between the light-irradiating part and the colored fiber to allow the light to pass through.

15. The bleaching apparatus as claimed in claim 13, wherein, The light is made at 0.001 W / cm 2 The above illuminance is applied to the dyed fibers.

16. The bleaching apparatus as claimed in claim 13 or 14, comprising: The cooling section cools the dyed fibers.

17. The bleaching apparatus of claim 16, wherein, The cooling section cools the colored fibers to below 30°C.

18. The bleaching apparatus as claimed in claim 13 or 14, wherein, The colored fibers are positioned opposite the light irradiation section. A light-shielding part is provided at a position that does not obstruct light from the light-irradiating part to the colored fiber.

19. The bleaching apparatus as claimed in claim 16, wherein, The cooling unit includes a water supply tank and a water spray unit. The water spray unit sprays water onto the colored fibers.

20. The bleaching apparatus of claim 16, wherein, The cooling unit is an air-cooled radiator and / or a water-cooled radiator. The surface of the cooling section that contacts the colored fibers is provided with holes and / or grooves. Water vapor and / or water are discharged from the holes and / or channels.

21. The bleaching apparatus as claimed in claim 16, comprising: A temperature detector is used to detect the temperature of the colored fibers. The temperature detector stops the light irradiation unit from irradiating based on the detected temperature.

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