JPH09111676A - Formation of pattern of woven and knitted fabric mixed with natural colored cotton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a free pattern such as a white pattern or a pattern of shade of color by placing a pattern mold on a woven or a knitted fabric mixed with a greenish naturally colored cotton and exposing the fabric, treating the fabric ammonia water or an aqueous solution of a zinc salt. SOLUTION: A desired pattern mold is placed on the surface of a woven or knitted fabric mixed with 10-100wt.% of a greenish naturally colored cotton, the fabric is exposed to ultraviolet ray, sunlight, etc., from the top of the pattern mold to fade the exposed photosensitive part. Then the woven or knitted fabric is immersed in 1-3g/l aqueous solution of 25% ammonia water, washed with water, further in 0.005-0.05mol/l aqueous solution of zinc acetate, washed with water and dried to give a woven or knitted fabric having the desired pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention incorporates natural colored cotton, which allows a white background pattern and a light and shade pattern to be freely developed on a knitted fabric composed of natural colored cotton without using ordinary dyes or discharge pastes. The present invention relates to a pattern forming method for knitted fabrics.

[0002]

2. Description of the Related Art Conventionally, a knitted and woven printed article is manufactured by printing a printing paste prepared by mixing a dye with a paste and printing it on a knitted woven fabric, followed by drying, coloring / fixing, washing and drying steps. A discharge-printed product with a white pattern is manufactured in the same manner as above, using a paste in which a discharge-printing agent is mixed in place of the dye. These methods use many chemicals and equipment, making it difficult to process small amounts.
In addition, it consumes a large amount of energy and is a factor that increases the coloring of wastewater and the load of organic pollution.

As a method of improving the conventional dyeing method using printing paste or the like and shortening the dyeing process, a dyeing method using ultraviolet rays is known. Such a dyeing method is applied to the fact that the cellulosic woven fabric undergoes photooxidation by ultraviolet rays and the dyeing density of the dye is reduced, and a shield is placed on the woven fabric and exposed to ultraviolet rays to expose and irradiate parts. Is a method of expressing a shade pattern by using the difference in shade of dyeing. However, since the dye is used, there is still a problem that the coloring of waste water and the load of organic matter pollution are increased.

By the way, green-colored natural cotton has poor light resistance and is easily faded by light. By taking advantage of such a property to the contrary and exposing a knitted fabric made of green-colored natural cotton with a shield, it is possible to form a white background or a light and shade pattern without using any dye. However, the unexposed portion still has low light resistance. Therefore, in order to form a stable white background pattern or a light and shade pattern on a knitted fabric composed of green-colored natural cotton, it is essential that the photo-fading part does not recolor while improving the light resistance of the unexposed part. is there.

[0005]

Therefore, the present invention can be carried out by a simple method with a small amount of processing in the patterning of a knitted fabric composed of green-colored natural cotton without using a dye or discharge paste. A knitted fabric containing natural colored cotton capable of maintaining a stable white background pattern or a light and shade pattern for a long period of time while improving the light resistance of the knitted fabric and easily fading the photobleached part. An object of the present invention is to provide a pattern forming method.

[0006]

In order to solve the above problems, the method for forming a pattern of a knitted fabric containing natural colored cotton according to the present invention is a pattern forming method on a knitted fabric containing green natural colored cotton. It is characterized in that the knitted fabric is dipped in an aqueous solution of ammonia and then in an aqueous solution of zinc salt after the photosensitized part is photobleached by arranging and exposing the pattern pattern with ultraviolet rays or sunlight. .

[0007] DETAILED DESCRIPTION natural colored cotton applicable in the present invention the invention is green type natural coloring cotton. 10% of the green-colored natural cotton is used for the whole knitted fabric.
It is applied to knitted fabrics containing about 100% by weight. The method for mixing natural colored cotton is, for example, a method in which natural colored cotton is mixed with normal raw cotton (white cotton) at the stage of raw cotton, and raw yarn is made from this to process it into a knitted fabric, but the method is not limited to this. A pattern die punched to form a desired pattern is arranged on the knitted fabric. The pattern type material is not particularly limited as long as it can block ultraviolet rays and sunlight. Although the pattern mold is arranged on the knitted fabric, the pattern mold may be directly placed on the knitted fabric, or the pattern mold may be arranged on the knitted fabric at a certain distance. Thus, when the pattern pattern is arranged on the knitted fabric and exposed to ultraviolet rays or sunlight from above the pattern pattern, the unexposed area remains as it is, but the photosensitive area undergoes photobleaching,
A shade pattern is formed. When this is observed with black light, the unexposed area emits yellow-green fluorescence having a peak wavelength of 493 nm, while the exposed area that has undergone photobleaching disappears the greenish fluorescence. When the pattern pattern is placed directly on the knitted fabric and exposed, a pattern with a clear boundary is formed, and when the pattern pattern is arranged on the knitted fabric with a distance, the greater the distance, the more It becomes a vague blur pattern. The degree of shading can be adjusted by appropriately selecting the exposure time and the wavelength of the ultraviolet rays to be irradiated.

Then, when the green natural colored cotton is dipped in an aqueous ammonia solution, the unexposed portion becomes dark green,
The light resistance is improved by about grade 1. Further, when it is further immersed in an aqueous solution containing a zinc salt, the light resistance is further improved by about the first grade while the color remains dark green. The photobleached portion is not recolored by the aqueous ammonia solution or the aqueous solution containing zinc salt. Although the concentration of the aqueous ammonia solution or the aqueous solution containing a zinc salt is appropriately adjusted, the concentration of the aqueous ammonia solution is preferably about 1 to 3 g / l of ammonia water (25%). Below 1 g / l of ammonia water (25%),
It is difficult to develop color, while when it exceeds 3 g / l, the smell of ammonia is strong and the work becomes difficult. The concentration of the aqueous solution containing zinc salt is preferably about 0.005 to 0.05 mol / l.
When the concentration is low, the effect of improving the light resistance is small, while when the concentration is high, there is a problem in drainage measures. The zinc salt is not particularly limited as long as it is water-soluble, and examples thereof include zinc acetate, zinc sulfate, and zinc chloride. When the acidity of the aqueous solution is strong, it changes from green to yellowish. Since an aqueous solution of zinc sulfate or zinc chloride is strongly acidic, an alkali may be added to adjust the pH to around neutral. However, it is preferable to use zinc acetate whose pH of the aqueous solution is close to neutral because the pH need not be adjusted. And
The immersion treatment in these aqueous solutions is carried out by holding the temperature at room temperature for a certain period of time, then raising the temperature and maintaining the temperature at a predetermined temperature (about 80 to 100 ° C.) for a certain period of time. When the processing temperature is low, the color development reaction becomes slow. In addition, in these dipping treatments, it is preferable to add a surfactant in order to enhance the permeability. The surfactant to be used is not particularly limited as long as it has stability to the metal salt without forming a precipitate.

If the order of the treatment with the aqueous solution of ammonia and the treatment with the aqueous solution of zinc salt is reversed, that is, if the treatment with the aqueous solution of zinc salt is carried out, the hue is light green and the light fastness is not improved. Further, when the aqueous zinc salt solution is mixed with aqueous ammonia and subjected to the immersion treatment, a part of the zinc ions is changed into hydroxide, which does not contribute to color development and causes the treated product to be contaminated with zinc hydroxide, which is not preferable. .

[0010]

The following examples serve to explain the present invention more specifically. These examples are illustrative of the invention and are not intended to limit the invention.

Example 1 Cotton fabric (sanya, warp yarn (30% of green-colored natural cotton mixed) 1
6S, weft (white cotton) 16S (English count), warp density 31 threads / cm, weft density 26 threads / cm, weight 200
The astringent paper (pattern type) from which the pattern was cut was placed on a desizing cloth (g / m ² ), fixed with a glass plate, and exposed for 14 hours outdoors in the daytime in fine weather. This woven fabric had a light green pattern in the unexposed area and a yellowish white in the exposed area and had a light and shade pattern with a blurred outline. After such exposure, the fabric was treated with ammonia water (25%) 2 g / l and a surfactant (Hoechst Ho
40% by weight of fabric containing 0.5 g / l
After stirring for 15 minutes at a liquid temperature of 30 ° C. in a double amount of aqueous solution,
The temperature was raised to 95 ° C. and immersion treatment was performed for 30 minutes. This was washed with water, and then stirred in a 40-fold amount of an aqueous solution containing 1 g / l of zinc acetate (dihydrate) and 0.5 g / l of a surfactant (Hostapon T manufactured by Hoechst) at a liquid temperature of 30 ° C. for 15 minutes. After that, the temperature was raised to 95 ° C. and immersion treatment was performed for 30 minutes. The woven fabric washed with water and dried was able to develop a shade pattern in which the unexposed portion was dark green and the exposed portion was light green. Table 1 shows the results of the fastness test and the color difference between the unexposed portion and the exposed portion (hereinafter the same) of the thus obtained patterned fabric.

Example 2 The same woven fabric as in Example 1 was loaded with the astringent paper from which the pattern was cut,
After fixing with a glass plate, it was exposed to UV carbon arc lamp light (FAL-5-BH manufactured by Suga Test Instruments Co., Ltd.) for 5 hours. This woven fabric had a light and dark pattern in which the unexposed area was light green and the exposed area was white. After such exposure, the woven fabric was subjected to the immersion treatment in the same manner as in Example 1. The woven fabric washed with water and dried was able to develop a shade pattern in which the unexposed portion was dark green and the exposed portion was white. The fastness test results and the color difference of the thus obtained patterned fabric are shown in Table 1.

Example 3 The same woven fabric as in Example 1 was loaded with the astringent paper from which the pattern was cut,
After fixing with a glass plate, a black light fluorescent lamp (two FL20S-BLB manufactured by Toshiba Lighting & Technology) was exposed for 96 hours. After exposure, it is difficult for the naked eye to identify the difference in shade, but when the pattern was removed and observed with the same UV fluorescent lamp as for exposure, the unexposed area showed yellow-green fluorescence with a peak wavelength at 493 nm. The yellowish green fluorescence disappeared in the exposed area, and the pattern was clearly confirmed. Then, the woven fabric was subjected to the immersion treatment in the same manner as in Example 1. The woven fabric washed with water and dried was able to develop a shade pattern in which the unexposed portion was dark green and the exposed portion was light green. The fastness test results and the color difference of the thus obtained patterned fabric are shown in Table 1.

Comparative Example 1 On the same woven fabric as in Example 1, astringent paper with a cut pattern was placed,
After fixing with a glass plate, it was exposed to UV carbon arc lamp light (FAL-5-BH manufactured by Suga Test Instruments Co., Ltd.) for 5 hours. This woven fabric had a light and dark pattern in which the unexposed area was light green and the exposed area was white. Table 1 shows the results of the fastness test and the color difference of the woven fabric.

COMPARATIVE EXAMPLE 2 On the same fabric as in Example 1, astringent paper with a cut pattern was placed,
After fixing with a glass plate, it was exposed to UV carbon arc lamp light (FAL-5-BH manufactured by Suga Test Instruments Co., Ltd.) for 5 hours. After the exposure, the fabric was placed in an aqueous solution containing 2 g / l of ammonia water (25%) and 0.5 g / l of a surfactant (Hostapon T, Hoechst) at 40 times the weight of the fabric at a liquid temperature of 30 ° C.
After stirring for 5 minutes, the temperature was raised to 95 ° C. and immersion treatment was performed for 30 minutes. The woven fabric washed with water and dried had a dark and light pattern in which the unexposed portion was dark green and the exposed portion was white. The light fastness test results and color difference of the thus obtained patterned woven fabric are shown in Table 1.
Shown in

Comparative Example 3 The same woven fabric as in Example 1 was loaded with the astringent paper from which the pattern was cut,
After fixing with a glass plate, it was exposed to UV carbon arc lamp light (FAL-5-BH manufactured by Suga Test Instruments Co., Ltd.) for 5 hours. After the exposure, the woven fabric was stirred at a liquid temperature of 30 ° C. for 15 minutes in a 40-fold amount of an aqueous solution containing 1 g / l of zinc acetate (dihydrate) and 0.5 g / l of a surfactant (Hostapon T manufactured by Hoechst). The temperature was raised to 95 ° C. and immersion treatment was performed for 30 minutes. The woven fabric washed with water and dried had a light shade pattern in which the unexposed portion was light green and the exposed portion was white. Table 1 shows the results of the light fastness test and the color difference of the patterned fabric thus obtained.

Comparative Example 4 On the same woven fabric as in Example 1, astringent paper with a cut pattern was placed,
After fixing with a glass plate, it was exposed to UV carbon arc lamp light (FAL-5-BH manufactured by Suga Test Instruments Co., Ltd.) for 5 hours. After the exposure, the woven fabric was stirred at a liquid temperature of 30 ° C. for 15 minutes in a 40-fold amount of an aqueous solution containing 1 g / l of zinc acetate (dihydrate) and 0.5 g / l of a surfactant (Hostapon T manufactured by Hoechst). The temperature was raised to 95 ° C. and immersion treatment was performed for 30 minutes. This was washed with water, and then ammonia water (25%) 2 g / l, a surfactant (Hostapon T, manufactured by Hoechst) 0.5
Liquid temperature 3 in an aqueous solution of 40 times the weight of the fabric containing g / l
After stirring at 0 ° C for 15 minutes, the temperature was raised to 95 ° C and immersion treatment was performed for 30 minutes. The woven fabric washed with water and dried had a light and shade pattern in which the unexposed portion was green and the exposed portion was white. Table 1 shows the results of the light fastness test and the color difference of the patterned fabric thus obtained.

[0018]

[Table 1]

The fastness test method is J
IS L 0842 The third exposure method of carbon arc lamp light, JIS L 0844 A-2 in the washing test
No., JIS L 0849 friction tester type II for friction test, JIS L 0848 for sweat test
It was performed with an acid (pH 5) and an alkali (pH 8). The light fastness is 9.L of JIS L 0842. According to the indication, the wash fastness, friction fastness and sweat fastness are J
IS L 0801 (General rules for dyeing fastness test method) 1
1. It is indicated by the display. The color difference is L * a * b *
It is shown by the color difference ΔE * _ab depending on the display system (JIS Z 8
730). The color difference was measured using a color computer SM-4-2 manufactured by Suga Test Instruments under the trade name. The unit of numerical values other than the color difference in Table 1 is "grade".

As is clear from Table 1, the light resistance is slightly improved (second grade → 2-3) only by the treatment with the zinc salt aqueous solution.
(Comparative Example 3), only by treatment with an aqueous ammonia solution, a green color is formed and the light resistance is improved by about 1st class (2nd class → 3rd class), but the light resistance is still about 3rd class. Cannot be said (Comparative Example 2). In addition, when the aqueous solution of the zinc salt solution and the aqueous solution of the ammonia solution are treated, the green color is lighter and the light resistance is not improved to the second grade as compared with the case of only the aqueous ammonia solution treatment (Comparative Example 4). On the other hand, the light fastnesses of the woven fabrics according to the examples were all as good as the fourth grade, and the washing fastness, the friction fastness and the sweat fastness were good. In addition, the color difference is large (1
0.5 Comparative Example 2) The difference in shade between the exposed area and the unexposed area was clear, and the color difference was hardly changed by subsequent treatment with the aqueous zinc salt solution (9.8 Example 2). It can be seen that the photosensitive portion does not recolor due to the processing.

[0021]

As is apparent from the above description, according to the present invention, a knitted or woven fabric composed of green-colored natural cotton can be freely used in a simple manner without using an ordinary dye or discharge paste. It is possible to develop a pattern or a light and shade pattern, improve the light resistance of the knitted fabric, and easily maintain a stable white background pattern or a light and shade pattern for a long period of time without easily fading the photobleached part. .

Front page continuation (72) Inventor Koichi Oishi 1-3-3 Shintoda, Hamamatsu City, Shizuoka Prefecture, Hamamatsu Industrial Technology Center, Shizuoka Prefecture (72) Fumiyo Kaneko, 5th Wholesale Honmachi, Hamamatsu City, Shizuoka Prefecture Nakamura Co., Ltd.

Claims (1)

[Claims] 1. A pattern type is arranged on a knitted fabric mixed with green-colored natural cotton, and the photosensitive part is photobleached by exposure to ultraviolet rays or sunlight from above the pattern type. A method for forming a pattern of a knitted fabric containing natural colored cotton, which comprises immersing in an aqueous solution and then in an aqueous zinc salt solution.