JPH1143861A - Method and device for continuously bleaching fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out bleaching of fabrics by applying a chemical solution using an oxidizing agent or a reducing agent, and ultraviolet lasers to desized and scoured fabrics. SOLUTION: This method for continuous bleaching of fabrics is to pad a chemical solution 3 such as an oxidizing agent, a reducing agent, etc., to a fabric 1 such as a desized and scoured knit and woven fabric, succeedingly, irradiate ultraviolet rays to the fabric 1 by a laser 6 to decompose impurities, coloring matters, etc., included in the fabric 1 and enhance activity of the chemical agents applied to the fabric 1, then, solubilize and dissolve the impurities, coloring matters, etc., in hot and cold water and remove them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretreatment which is performed on the premise of dyeing an industrially produced fabric such as a woven or knitted fabric. The present invention also relates to a bleaching method and apparatus for decomposing impurities (such as contaminants, pigments, oils and fats) adhering to a cloth, decomposing the same, and solubilizing the same in hot and cold water, and effectively removing the impurities from the cloth.

[0002]

2. Description of the Related Art In a conventional pretreatment method for a fabric, a sizing agent applied in a normal weaving process is decomposed by an enzyme or an oxidizing agent in a desizing process to reduce the molecular weight, and is solubilized in hot water and removed. I do. Then oiling agent, oils and fats in fiber,
Impurities and the like are saponified with an alkaline agent, solubilized in hot water and removed, and as a final step of the pretreatment, the pigmented component is treated with an oxidizing agent and a reducing agent to form a conjugated double bond (-N
= N- etc.) to complete the pretreatment by bleaching
It is used for subsequent dyeing and the like.

[0003] The above-mentioned oxidation and reduction treatments are carried out by boiling with the above-mentioned oxidizing agent and reducing agent for about 0.5 to 2 hours and washing thereafter, or by applying a solution having an appropriate concentration of these agents to a cloth by padding means. After adhering 80 to 110% of the weight to the fabric, the mixture is steamed for about 0.5 to 1 hour in a steam atmosphere at about 95 ° C. to promote the reaction and bleach.

[0004]

In such a conventional pretreatment method, the oxidizing agent and the reducing agent are activated by the energy given by the heating of water as a solvent. The reaction with the impurities in the fiber is carried out.
This method heats water having a large heat capacity up to the boiling point and requires a large amount of heat to maintain the heat required for the time required for the reaction. There were inconveniences such as becoming

As an oxidizing agent used for the purpose of bleaching, hydrogen peroxide is generally used. However, since hydrogen peroxide may cause brittle fibers due to a rapid reaction,
Since it is necessary to react slowly over a long period of time while adding a decomposition inhibitor to delay the decomposition, steam and heat must be used for a long time, and the finish of the fiber becomes harder There is a problem.

As a reducing agent used as a pretreatment, hydrosulfite and SO ₂ are used, but this has a problem that the bleaching power is weak and a sufficient bleaching effect cannot be obtained for bleaching cotton or the like. There were also points.

The present invention has been made in order to solve the above-mentioned problems, and focused on the fact that light energy in the ultraviolet region in a photochemical reaction effectively activates a drug and water as a solvent thereof. Furthermore, focusing on the fact that laser photochemical reactions have an order of magnitude greater reaction capacity than ordinary photochemical reactions, decomposition and decolorization of pastes at low temperatures by deactivating molecular bonds due to this activation, etc. The strong activation shortens the reaction time, obtains a high degree of whiteness, improves the texture, and suppresses the heat applied to the fiber drug by the photochemical reaction. It is an object of the present invention to provide a continuous bleaching method for fabrics and a device capable of avoiding embrittlement and hardening of fibers due to the above, and further enabling downsizing and energy saving of a bleaching device.

[0008]

In order to achieve the above object, in claim 1, a knitted woven cloth padded with a chemical solution to which an oxidizing agent and a reducing agent are added is irradiated with ultraviolet light by a laser to the cloth. While decomposing impurities and dyes contained,
The method is characterized in that it is a method for bleaching a knitted fabric in which the activity of the chemical solution applied to the fabric is increased, and then the impurities and dyes are solubilized and removed in hot water.

According to a second aspect of the present invention, in addition to the first aspect, a bleaching method of a knitted woven fabric in which the ultraviolet laser for irradiating the knitted woven fabric is a light beam of 150 nm to 370 nm.

According to a third aspect of the present invention, there is provided a putting tank for applying a chemical solution containing an oxidizing agent and a replacement agent to the knitted woven fabric along a transfer direction of a transfer path for continuously running the long knitted woven fabric. A roll group for performing timing transfer for the purpose of bleaching reaction of the knitted woven fabric impregnated with the chemical solution,
It is a bleaching device for a knitted fabric in which a laser oscillation mechanism for uniformly irradiating a laser to the knitted fabric passed through the roll group is provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings.

The bleaching method of the present invention comprises a liquid treatment step of applying an oxidizing agent and a reducing agent to a knitted and woven fabric (hereinafter simply referred to as a cloth), and a laser for irradiating the cloth obtained with the liquid treatment step with a laser. It consists of a processing step. In FIG. 1, reference numeral 1 denotes a long cloth to be treated, and this cloth 1 is first supplied into a chemical liquid putting tank 2, where the oxidizing agent, the reducing agent and the activation thereof are activated. Solution (treatment solution) 3 mixed with an appropriate auxiliary agent to assist
Is impregnated. The cloth 1 impregnated with the chemical solution 3 is adjusted to an appropriate squeezing rate by a squeezing roll 4, and then guided to a group of timing rolls 5 at room temperature to cause a bleaching reaction. The cloth 1 that has passed through the timing roll group 5 is sent to the laser oscillation mechanism 6, which
In order to keep the reaction time of the laser for one surface of the transferred fabric long, a large number of the fabrics are arranged along the transfer direction of the fabric. It is configured to be long.

Further, one of the constitutions of the laser oscillation mechanism 6 is as follows.
In the column, as shown in FIG.
And lens systems 5, 9 and 10 for uniformly diffusing the laser from the laser oscillator 7 in the width direction of the cloth. The laser system can be expanded into a rectangle by these lens systems. The laser oscillator 7 includes:
Excimer laser, gas laser, semiconductor laser, Y
For example, a laser oscillator that can emit a laser whose energy is concentrated in a very narrow frequency region and emits a laser beam having a very sharp directivity can be selected from an AG laser or the like. .

There are also various types of excimer lasers and gas lasers. For example, in the case of excimer lasers, various types of known lasers as shown in Table 1 below can be used. The requirement is to select and use an ultraviolet laser that does not heat the laser.

[0015]

[Table 1]

In the gas laser,

[0017]

[Table 2]

Judging from the respective characteristics of the excimer laser and the gas laser, most of the excimer lasers have a wavelength of 150 to 400 nm in the ultraviolet region.
m, an excimer laser oscillator can be used in the present invention. Further, in the case of a gas laser, it is possible to use an argon ion laser oscillator using argon ions or a krypton ion laser oscillator using krypton ions, as well as a helium cadmium laser oscillator and a nitrogen laser oscillator, judging from these characteristics. .

As other lasers, a solid-state laser or a semiconductor laser oscillator can be used as an oscillator. However, since a semiconductor laser oscillator generally has a small output, it can be obtained by integrating a plurality of semiconductor laser oscillators. The object of the present invention can be achieved.

Next, the action will be described. NaBH ₄ , which shows a specific reactivity when combined with light, is used as a reducing agent for bleaching on a cloth as a chemical solution supplied into the chemical solution putting tank 2.

As can be easily inferred from the property that NaBH ₄ generates hydrogen at 550 ° C. and rapidly decomposes, under certain conditions, a large amount of hydrogen is generated by a given energy and a strong reducing power is obtained. Is a metal-hydrogen complex compound having

NaBH ₄ reacts with methanol to generate 100% hydrogen at 60 ° C. for 24 minutes. However, it reacts slowly with ethanol and can be reduced in a homogeneous solution. Is not lost as much as is the case with methanol. Taking advantage of these features, the bleaching can be performed while minimizing the damage to the fabric by selectively using the fabric depending on the fiber type, density, and blending specifications.

Then, the cloth 1 after desizing and scouring is supplied to the putting tank 2 and impregnated with the chemical solution 3 in the putting tank 2, and then the cloth 1 is guided to the timing roll group 5. Let it. The cloth 1 passing through the timing roll group 5 undergoes the reaction by the chemical solution, and then the cloth 1 is sent to a laser irradiation zone by the laser oscillation mechanism 6. In this laser irradiation zone, the cloth 1 containing the above-mentioned chemical solution 3 receives the laser to decompose impurities, dyes, etc. attached to the cloth 1 and activate the above-mentioned chemicals and the like applied to the cloth. (Activation) and bleaching is effectively performed.

After the degreased and scoured fabric has been treated with an oxidizing agent and a reducing agent, the fabric is irradiated with a laser having an ultraviolet wavelength, and then the fabric is washed in a washing tank (not shown). By the treatment, impurities, pigments and the like adhering to the fabric are dissolved and dropped by the hot water, and the bleaching of the fabric is effectively performed.

Hereinafter, embodiments of the present invention will be described.

[0026]

【Example】

[Example 1] A 10% hydrogen peroxide solution was added to NaOH 1%
Activated alkaline in 2 dp2
After padding with nip (aperture ratio 100%), 2
48 nm. A 35 Hz (Hertz) KrF excimer laser was used at 7.5 mJ / cm ² / pls. (Pulse) irradiation
Thereafter, the fabric was washed with hot water → surfactant washing → hot water → water washing (hereinafter referred to as washing) and then dried. As a result of this processing, Hunter whiteness was 90.3. Y. A treated cloth having a measured value of I (yellow index) of 0.16 was obtained. This value is a value when no fluorescent brightener is used in combination.

Note: Value of standard white plate for colorimetric reference Hunter whiteness 96.4 Y. I 0.1 Fabric used: Twill cotton fabric Weft 40/2, warp 20/2 [Example 2] 10% NaOH was used to make it alkaline.
% (A solvent of methanol - aqueous mixture) of NaBH ₄ used, after padding (100% aperture ratio) scouring already fabric at 2dip2nip, 248nm. 35 Hz (Hertz) KrF excimer laser is applied at 40 mJ / cm ² /
pls. Energy of 1000 pls. (Pulse) Irradiation was followed by washing and then drying. As a result of this processing, the Hunter whiteness is 89.98. Y. A treated cloth having a measured value of I (yellow index) of 0.16 was obtained.

Similarly, 193 nm. A 70 Hz ArF excimer laser was applied at 50 mJ / cm ² / pls. Energy of 1000 pls. Hunter whiteness 8 when irradiated
9.7. Y. I (yellow index) 0.17 was obtained.

A bleached cloth having a soft texture thicker than that of oxidative bleaching was obtained.

This value is a value when no fluorescent brightener is used in combination.

Note: Value of standard white plate for colorimetric reference Hunter whiteness 96.4 Y. I 0.1 Fabric used: Twill cotton cloth Weft 40/2, warp 20/2 [Example 3] 8% made alkaline with 1% NaOH
Using NaBH ₄ (solvent water) of 2 d
After padding with p2nip (aperture ratio: 100%), 248 nm. A 35 Hz (Hertz) KrF excimer laser was applied at 40 mJ / cm ² / pls. Energy of 1000 pls. (Pulse) Irradiation was followed by washing and then drying. As a result of the processing, Hunter whiteness was 90.23.
Y. A treated cloth having a measured value of I (yellow index) of 0.15 was obtained.

A bleached cloth having a soft texture thicker than that of oxidative bleaching was obtained.

This value is a value when no fluorescent brightener is used in combination, but the ester filament has fluorescence.

Note: Value of standard white plate for colorimetric reference Hunter whiteness 96.4 Fabric used: E / C (50/50) Poplin 20/2 Latitude 40/20 [Example 4] 1% NaOH and alkalinity 10
% NaBH ₄ (solvent is a mixture of methanol and water), and after padding the scoured cloth with 2 dips and 2 nips (squeezing rate 100%), 308 nm. 70 Hz (Hertz) XeCl excimer laser at 70 mJ / cm ²
/ Pls. Energy of 1000 pls. (pulse)
After irradiation, they were washed and then dried. As a result of that processing,
Hunter whiteness 85.7. Y. A treated cloth having a measured value of I (yellow index) of 0.16 was obtained.

This value is a value when no fluorescent brightener is used in combination.

Note: Value of standard white plate for colorimetric reference Hunter whiteness 96.4 Y. I 0.1 Fabric used: Twill cotton fabric Weft 40/2, 20/2 [Example 5] A 4% hydrogen peroxide solution was activated to alkaline with 1% NaOH, and a scoured fabric was converted to 2 dip 2n.
After padding with ip (aperture ratio 100%), 20
248 nm after standing at room temperature for minutes. A 35 Hz (Hertz) KrF excimer laser was supplied at 30 mJ / cm ² / pls.
Energy of 200 pls. (Pulse) Irradiation was followed by washing and then drying. As a result, the hunter whiteness was 87.
3. Y. A treated cloth having a measured value of I (yellow index) of 0.17 was obtained. This is probably due to the penetration effect of the drug.

This value is a value when no fluorescent brightener is used in combination.

Note: Value of standard white plate for colorimetric reference Hunter whiteness 96.4 Y. I 0.1 Fabric used: 120 cotton broad cloth 120/2 through 120/2

[0039]

As described above, according to the present invention, instead of the conventional activation of a drug by thermal energy, activation of a molecule by a photochemical reaction, and further, activation of the drug by utilizing the impact effect of a pulse wave. Effective and its activating effect is
This makes it possible to shorten the bleaching step and to perform bleaching at lower temperatures, which is stronger than the conventional method. In addition, although bleaching with a reducing agent was conventionally considered to be favorable in terms of texture, the bleaching power was weak and the target of use was limited, but as shown in Examples 2, 3, and 4 of the present invention, good whiteness was obtained. can get.

Further, according to the present invention, as a continuous treatment apparatus for fabric, numerical control of the reaction is more accurate and easier than the conventional heating by steam, and it depends on the specifications such as the fiber type, density, and blending ratio of the fabric. Good bleaching can be achieved while minimizing damage to the fabric by properly controlling the pulse used, the distance to the fabric, and the like.

The size of the laser oscillation device used in the present invention can be greatly reduced in size as compared with the size of a conventional wet heat reaction treatment device, and thus, a long cloth should be bleached. There is a feature that the entire equipment can be reduced in size and the installation space can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a desizing / scouring / bleaching apparatus according to the present invention.

FIG. 2 is a schematic explanatory view of a laser oscillation mechanism used in the desizing / scouring / bleaching apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fabric 2 ... Chemical liquid putting tank 3 ... Desizing scouring treatment liquid 4 ... Squeezing roll 5 ... Timing roll 6 ... Laser oscillation mechanism 7 ... Laser oscillator 8 ... Lens system 9 ... Lens system 10 ... Lens system 11 ... Guide roll

Continuation of the front page (71) Applicant 597103159 Yoshinori Koga 2-11-5 Funato, Abiko-shi, Chiba (74) The above three agents Patent attorney Masayuki Kishida (two outsiders) (72) Inventor Miteru Yamato Wakayama 4-72-5 Usu, Wakayama-shi, Yamato Ironworks Co., Ltd. (72) Inventor Akihiko Ouchi 3-303-104, Takezono, Tsukuba, Ibaraki Pref. −5 (72) Inventor Tamura Tadashi ▼ Man 190-31 Kismitera Temple, Wakayama City, Wakayama Prefecture (72) Inventor Hiroshi Ishitetsuro 4-4-5 Usu, Wakayama City, Wakayama Prefecture Inside the Shandong Iron Works

Claims (3)

[Claims] The present invention relates to a method for manufacturing a knitted and woven fabric which has been desizing and desiccated, to which a chemical solution containing an oxidizing agent and a reducing agent is padded, and then the fabric is irradiated with ultraviolet rays by a laser beam to remove impurities and dyes contained in the fabric. A method for bleaching a knitted woven fabric, which comprises decomposing the same, increasing the activity of the drug applied to the fabric, and solubilizing and removing the impurities, dyes and the like in hot and cold water. 2. The method for bleaching a knitted fabric according to claim 1, wherein the ultraviolet laser applied to the knitted fabric is a light beam having a wavelength of 150 nm to 370 nm. 3. A padding tank for applying a chemical solution containing an oxidizing agent and a reducing agent to the knitted woven fabric along a transfer direction of a transfer path for continuously running a long knitted woven fabric, and the chemical solution applied and impregnated. A roll group for performing timing transfer for the purpose of bleaching reaction of the obtained knitted woven fabric, and a laser irradiation mechanism for uniformly irradiating a laser to the knitted fabric passed through the roll group. Knitted fabric bleaching equipment.