JP2982245B2 - Printing device for fabric and leather - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is intended to draw clear images and characters on black or dark-colored fabrics and leathers that can be erased with water without fail. The present invention relates to a printing device for fabric and leather.

[Prior art] Conventionally, in the case of drawing an image or a character on a black or dark-colored cloth or leather, a white pigment-based ink is used because the use of a dye-based ink is insufficient in shading of the base and lacks sharpness. ing. However, image lines and characters drawn with such ink cannot be reliably erased. Therefore, for the purpose of solving the above problems, an ink using a zinc ammine complex salt is proposed in Japanese Patent Publication No. 62-25712, and an ink using a higher alkyl sulfate is proposed in Japanese Patent Publication No. 1-26631. ing.

[Problems to be Solved by the Invention] However, in the ink disclosed in Japanese Patent Publication No. 62-25712 in which a zinc ammine complex salt is dissolved in an aqueous solvent, the transparent ink is whitened on a cloth or the like. The process involves evaporation of ammonia, and ammonia water is used at the time of erasing, so that it is not very practical in terms of odor. On the other hand, in the ink disclosed in Japanese Patent Publication No. 1-26331 in which a higher alkyl sulfate is dispersed in glycerin, sufficient whiteness is obtained probably because the refractive index of the higher alkyl sulfate is close to that of glycerin. I can't. For this reason, even if it is actually drawn on a dark-colored cloth, it cannot be visually confirmed, and it cannot be said that the object has been achieved very much.

The present invention has been made in order to solve the above-described problem, and is capable of drawing an image portion that is clear and can be surely erased with water on a dark-colored cloth or leather. It is intended to be.

Means for Solving the Problems In order to achieve this object, the present invention relates to a method for fabrics and leathers provided with an ink ejecting means for ejecting ink to draw characters and graphics on the fabrics and leathers. In a printing apparatus, the ink is finely dispersed in a water-soluble white powder, a hydrophilic organic solvent that does not dissolve the water-soluble white powder,
A water-soluble resin is dissolved in the hydrophilic organic solvent.

Further, in the above configuration, the ink may be colored by adding a colorless leuco dye and a water-soluble developer.

[Effect] When a character or an image is drawn on a cloth or leather using the printing apparatus for cloth or leather of the present invention having the above-described configuration, the solvent in the ink immediately permeates into the object to be drawn. Evaporate and eliminate. On the other hand, part or all of the finely dispersed white powder remains on the surface of the object to be drawn, and is fixed by the water-soluble resin added to the ink to complete clear drawing. Next, when erasing the image portion, the white powder forming the image portion can be dissolved in water by wiping with a cloth or the like impregnated with water or by spraying water with a mist or the like. , Diffuse in the object to be drawn,
It disappears by permeation. Moreover, even after the water dries, no trace remains on the portion.

On the other hand, in the case of coloring with a leuco dye and a water-soluble developer, the coloring is caused by dispersing the water-soluble developer in water by adhering water, and diffusing and penetrating into the object to be drawn together with water. Separates from insoluble dyes. As a result, the dye returns to its original colorless structure and the color disappears.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

The ink composition used in the printing apparatus of the embodiment shown in FIGS. 1 and 2 is a white ink obtained by finely dispersing a white powder in a hydrophilic organic solvent that hardly dissolves the white powder. The white powder used here must be appropriately selected from a substance that is easily soluble in water to a substance that is hardly soluble in water, from the viewpoint of the erasability and fastness required for the ink. That is, if the erasability is considered to be the maximum, sucrose, saccharides such as glucose, or alkali metal salts of organic acids and inorganic acids are appropriate. Organic acids such as amino acids and inorganic weak acids and weak basic salts can be used. In order to obtain even more inferior whiteness, a small amount of a white pigment such as titanium oxide or calcium carbonate can be added, but washing with water or the like is required to erase the pigment.

Next, as the solvent used here, since it is necessary to dissolve the water-soluble resin, from various cellosolves, carbitol, carbitol acetate, monohydric alcohol, polyhydric alcohol, etc., the drying speed required for the ink, It is adjusted singly or as a mixture in consideration of the solubility of the water-soluble resin.

The water-soluble resin, which is added to fix the white powder on the object to be drawn, is limited by conditions such as being soluble in water and being soluble to some extent in the hydrophilic solvent,
It is narrowed down to hydroxypropyl cellulose, methyl cellulose and ethyl cellulose.

The ink made from the above white powder, resin, and solvent is white, and is clear on a dark-colored object, but may be difficult to see on a white-type object.

For such an object, the white ink is colored by adding a leuco dye and a water-soluble developer.
As for the obtained hue, any hue is possible if a leuco dye is selected, and a colored ink with a weak underlayer is realized.

As the leuco dye, usually a colorless dye conventionally used for heat-sensitive pressure-sensitive recording can be used, while as a water-soluble developer, a water-soluble metal thiocyanate, for example, a zinc salt, a cobalt salt, a nickel salt or the like is used. Is appropriate. Further, a phenolic substance having a sulfone group introduced therein, for example, P-toluenesulfonic acid, naphthalenesulfonic acid, P-sulfosalicylic acid, sulfonated bisphenol, sulfonated phenol resin, and the like can be similarly used.

Characters and image lines drawn with the colored ink as described above can of course be erased by adhering water. The white powder component existing in the image area is erased as described above, and the coloring dye is erased by the water, the developer component diffuses and penetrates into the object to be drawn, and is separated from the leuco dye.

 An example of an ink composition based on the above contents is shown below.

(Example 1) Sodium glutamate (Kyowa Hakko) 180 parts by weight Hydroxypropyl cellulose (Nippon Soda HPC-SL) 15 parts by weight Sorbitan sesquioleate (Kao Arrasel 83) 5 parts by weight Ethyl cellosolve 200 parts by weight Butyl cellosolve 50 parts by weight First, ethyl Cellosolve, a predetermined amount of hydroxypropylcellulose is dissolved in the above composition mixture of butyl cellosolve, a predetermined amount of sorbitan sesquioleate is added to the solution, sodium glutamate is added, and sufficient preliminary stirring is performed to obtain a uniform suspension. I do.

Next, the suspension is wet-pulverized with a sand mill or the like to obtain a fine dispersion having a particle size distribution of about 0.5 to 4.0 μm. Using the ink 5 obtained here, characters and figures were drawn on dark-colored cloth by two methods, a ballpoint pen 6 shown in FIG. 1 and an air-jet type plotter shown in FIG. And a drawing having a sufficient fixing force was obtained. Moreover,
Next, when the image area was erased, the water disappeared completely by spraying water once with a spray, and no trace was left even after the water was evaporated.

(Example 2) L-glutamic acid 200 parts by weight RED530 (Yamada Chemical) 5 parts by weight Zinc thiocyanate 75 parts by weight Hydroxypropylcellulose (Nippon Soda HPC-L) 10 parts by weight Sorbitan sesquioleate (Kao Arrasel 83) 5 parts by weight Ethyl Cellosolve 200 parts by weight Diacetone alcohol 50 parts by weight L-glutamic acid was added to an ethyl cellosolve solution in which sorbitan sesquioleate and hydroxypropylcellulose were dissolved, and the mixture was wet-ground with a sand mill to obtain the same white ink as in Example 1. Separately, a red ink composition prepared by dissolving zinc thiocyanate and RED530 in diacetone alcohol is prepared and mixed with the white ink. Here, a red ink with a weak power is obtained. When this ink was used to draw on a checkered cloth having a white portion and a dark portion alternately in the same manner as in Example 1, clear image lines were obtained in both portions.

After 1 hour of drawing, the drawn material was subjected to steam ironing, but the image did not disappear at all and the sharpness did not change. Next, when sufficient water was applied to the drawing portion by spraying, the image disappeared gradually, and when the water was completely evaporated and dried, the image completely disappeared.

(Example 3) L-glutamic acid 200 parts by weight Blie 3NB (Yamamoto Kasei) 7 parts by weight Cobalt thiocyanate 30 parts by weight Hydroxypropylcellulose (Nippon Soda HPC-L) 10 parts by weight Sorbitan sesquioleate (Kao Arrasel 83) 5 parts by weight Ethyl cellosolve 200 parts by weight Diacetone alcohol 50 parts by weight A blue ink having a negative power was obtained in the same manner as in Example 2. In addition, the evaluation result of the drawn matter is also steam iron resistance,
The erasability was almost the same as that of Example 2.

[Effects of the Invention] As is clear from the above, according to the present invention, any hue including black or dark colors, fabrics with patterns,
It is possible to draw clear and sticky characters and objects on leather, and the characters and objects can be reliably erased with water. Also, if you select the degree of water solubility of the white powder used,
It is also possible to make it not disappear with steam iron but with water.

Therefore, when cutting lines and sketches are drawn in dressmaking, embroidery, etc., if the present invention is used, it can be used without limitation for any target fabric, and a steam iron can be applied during sewing, and after use In addition, the cutting lines and sketches can be surely erased with water. In addition, if the fluidity of the ink is appropriately adjusted, the invention can be applied to various printing apparatuses such as a jet printing system and the like, in addition to the Chaco pen system, and its use value is great.

[Brief description of the drawings]

FIG. 1 is a diagram showing a ballpoint pen used in an embodiment of the present invention, and FIG. 2 is a diagram showing an air jet type plotter of the embodiment of the present invention. In the figure, 6 is a ball-point pen and 7 is a plotter.

Claims (2)

(57) [Claims] 1. A printing apparatus for fabric and leather, comprising an ink ejecting means for ejecting ink to draw characters and graphics on the fabric and leather, wherein the ink is a water-soluble white powder. A finely-dispersed water-soluble white powder in a hydrophilic organic solvent that does not dissolve the water-soluble white powder, and a water-soluble resin dissolved in the hydrophilic organic solvent. 2. The printing apparatus for printing on fabrics and leathers according to claim 1, wherein the ink is colored by adding a colorless leuco dye and a water-soluble developer.