JPH06313282A - Wet transfer style printing and ink sheet therefor - Google Patents

Abstract

PURPOSE:To provide a method capable of deep color dyeing excellent in fine line printing and level printing and entirely free from occurrence of blur in relation to a wet plateless printing method in which ink containing a water-soluble or dispersible dye is used. CONSTITUTION:A water-soluble or insoluble thermoplastic resin is put on a base in layers and an image is recorded on the obtained transfer sheet by a thermal printer using an ink sheet composed of a film coated with a hot melt ink prepared by dispersing a water-soluble or dispersible dye in wax. The resultant image-recorded transfer sheet is heat-bonded to a fabric and subjected to steaming and soaping treatments after applying a wet sizing agent to the fabric surface of the bonded material and drying it or without applying any more treatment.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a plateless printing method.
More specifically, it relates to a wet plateless transfer printing method using a water-soluble or water-dispersible dye.

[0002]

2. Description of the Related Art An ink jet method is known as a wet plateless printing method using a water-soluble or water-dispersible dye. This is a method of directly ejecting and fixing ink droplets, in which a water-soluble or water-dispersible dye is dissolved, onto a cloth to which a water-soluble polymer has been added as a bleeding prevention process, but the ink composition is extremely limited and the dye The concentration cannot be increased so much. Therefore, in order to dye at a high density, it is necessary to eject ink droplets at a high density per unit area. In this case, however, the bleeding is likely to occur because the cloth is dry even if bleeding prevention processing is performed. is there. When the water-soluble polymer is applied in the paste state, this bleeding is suppressed, but it is extremely difficult to run the flexible cloth in the wet state while accurately maintaining the positional accuracy, and even if possible, it is expensive. It becomes a large dedicated printer.

[0003]

Therefore, the object of the present invention is to
Provided is a means capable of realizing high-density dyeing excellent in fine line expression and leveling property in a wet type plateless printing method using an ink containing a water-soluble or water-dispersible dye, without causing bleeding at all. Especially.

[0004]

The means for solving the above problems is a transfer sheet obtained by laminating a water-soluble or water-insoluble thermoplastic resin using a hot-melt ink prepared by dispersing a water-soluble or water-dispersible dye in a wax. The wet transfer printing method is characterized in that the heat-bonded body of the image-formed transfer sheet and the fabric is used as it is, or after steaming and soaping after applying wet glue to the fabric surface.

According to the knowledge of the inventor of the present invention, a hot-melt ink in which a water-soluble or water-dispersible dye is dispersed in a wax is fixed on a transfer sheet formed by laminating a water-soluble or water-insoluble thermoplastic resin on a substrate. After the transfer sheet and the cloth are heat-bonded, the dye in the hot-melt ink is adhered without causing bleeding at all, or by steaming after applying wet glue to the cloth surface and drying. Move rapidly to.

This is a replica-shaped transfer sheet in which a thermoplastic resin laminated on a transfer sheet is softened by heating during thermal bonding and becomes a flexible resin layer having a thickness equal to the laminated thickness, and conforms to the unevenness of the cloth surface. As a result, the hot melt ink fixed on the surface adheres to the concavities and convexities of the opposite fabric and adheres to the fibrous material. As a result, the hot melt ink contacts the fibrous material and the wet paste during steaming. The reason is that, except for the above, the periphery is completely sealed with the resin, and bleeding in the surface direction of the fabric is completely suppressed.

As the thermoplastic resin to be laminated on the transfer sheet, either a water-insoluble resin or a water-soluble resin can be selected, but the use conditions and effects are greatly different.

First, the case where the thermoplastic resin is a water-insoluble resin will be described. The thermal bonding between the transfer sheet and the non-woven fabric is carried out at a temperature not lower than the temperature at which the thermoplastic resin laminated on the transfer sheet is softened and at a temperature at which the resin does not lose the film property, for a short time.
For example, it may be held in close contact for 5 to 20 seconds. This makes it possible to dissolve the wet paste in the soaping process and easily peel the thermoplastic resin as a film layer from the cloth. This is advantageous in that the burden of removing the paste component in the waste water is smaller than that in the case of using a water-soluble resin. If the heat-bonding temperature is too high, the laminated thermoplastic resin loses the film property and becomes a hot-melt adhesive that penetrates into the inside of the fabric and fuses with the fibers, making it easy even in the soaping process. You will not be able to degrease it.

The transfer sheet is made of a heat-resistant substrate such as paper or film, and a thermoplastic resin such as polyester resin, polyamide resin, acrylic resin, ethylene-vinyl acetate copolymer resin having a softening point of about 170 ° C. or less. In a thickness of about 1 to 50 microns. It can be said that the thicker the laminated thickness of the thermoplastic resin is, the more effectively it can adhere even to the concave portion of the cloth, which is a rough surface with severe unevenness, but it can be said to be effective when the wet glue is applied to the cloth after thermal bonding. An excessive thickness is not necessary, because the space between the cloth and the thermoplastic resin is filled with the glue and the adhesion between the cloth and the thermoplastic resin is compensated.

The transfer sheet can exhibit further effects by adopting a structure in which a thermoplastic resin is laminated on a releasable substrate. This is because even if the thermoplastic resin has an extremely thin laminated thickness of about 1 to 10 μm, it can be fit evenly to the concave portion of the fabric by thermal bonding and can be adhered to it, and only the substrate can be peeled off in the same adhered state. . This method is also effective in that the steaming step can be performed efficiently because there is no substrate layer of the transfer sheet that hinders the penetration of vapor.

Next, the case where the thermoplastic resin is a water-soluble resin will be described. In this case, unlike the case of the water-insoluble resin, the thermal bonding temperature is higher than the temperature at which the water-soluble resin melts. For this reason, the melted water-soluble resin is fused to the cloth in a state in which the melted hot-melt ink is locally finely dispersed in the surface layer portion. This means that the structure is such that the dye is dispersed in the glue that has adhered to the surface of the fabric, that is, the printing dye is close to the actual printing structure in which the dye is printed on the fabric, fixed and dried. To do. Therefore, the application of the wet glue to the fabric after the thermal bonding, which is required to prevent the bleeding during steaming, which is necessary when the non-water-soluble resin is used, is performed by the water-soluble resin itself. There is a great advantage in that it is no longer required.

As the water-soluble resin, any water-soluble resin can be selected as long as it is water-soluble, but the smooth film forming property, the gelatinization suitability, the low temperature melting property, and the humidity stability during storage necessary for good image formation. From the viewpoint of suitability for dyes, polyvinyl alcohol can be preferably used. Polyvinyl alcohol is in a state of equilibrium water content corresponding to the temperature and humidity. For example, the moisture content at a temperature of 20 ° C. at 45%, 65%, and 80% is 5 to 7%, 8 to 10%, and 12 to 15, respectively. %. The melting temperature greatly varies depending on the water content, and for example, the melting temperatures corresponding to the water content are 170 to 200 ° C. and 1 respectively.
It is 50-180 degreeC and 140-170 degreeC.

Polyvinyl alcohol having a thickness of about 20 to 100 μm is produced as a film rolled to have a smooth surface. However, due to its suitability as a transfer sheet for a thermal printer, it can be used alone or as a composite sheet. It is necessary to prepare a transfer sheet having a firm thickness of about 50 μm or more. Needless to say, it is necessary to interpose a heat resistant sheet so that the molten resin will not be fused to the hot plate at the time of heat bonding, or to have such a property in the base sheet of the composite film. If the sheet does not have a dense structure that does not allow the molten resin to enter, the molten resin will be absorbed by the sheet during thermal bonding and the sheet cannot be bonded to the cloth. Otherwise, it is necessary to use an excessively thick film that allows for it.

As the water-soluble or water-dispersible dye which can be used in the present invention, since the present invention is a wet dye, a direct dye, a reactive dye, which is used in conventional wet printing,
It is clear that all dyes such as acid dyes, basic dyes, water-soluble dyes such as complex salt dyes, and disperse dyes obtained by adding a dispersant to a water-insoluble dye to make them water-dispersible can be mentioned.

The wax used in the present invention has a melting point of 5
It is preferably 0 to 200 ° C., preferably 60 to 150 ° C., specifically, plant waxes such as rice wax, wooden stick, candelilla wax, carnauba wax, animal waxes such as lanolin, stick, shellac wax. ,
Mineral wax such as montan wax, paraffin wax, microcrystalline wax, oxidized paraffin wax, chlorinated paraffin wax, ricinoleic acid amide, lauric acid amide, oleic acid amide,
Examples thereof include synthetic waxes such as polyethylene wax and polyethylene oxide wax.

As a method for coating a water-soluble or water-dispersible dye in the above wax by coating, a mixture of the usual two methods is crushed by a ball mill or the like and hot-melt coated or gravure coated, or a wax is used. A method of dissolving or dispersing the dye in an emulsion and performing solvent coating or a method of drying the dye and then hot-melt coating can be selected. The above hot-melt ink is used as a base material for a plastic film having a thickness of 2 to 25 .mu.m and excellent in thermal conductivity.
It is applied to a thickness of 10 microns. Needless to say, conventional softeners, powder heat conductive substances, extender pigments, etc. may be added as necessary.

The wet paste used in the present invention is preferably used with a viscosity equivalent to or higher than that of the original paste used in the conventional screen printing. As the sizing agent, starches such as wheat flour, which are used as conventional sizing agents for printing, processed starches such as dextrin, fibrin derivatives such as methylcellulose, synthetic sizing agents such as polyvinyl alcohol, and other emulsion glues should be used without limitation. However, it goes without saying that it should be selected according to a conventional method depending on the fiber material to be dyed and the characteristics of the dye used.

[0018]

Example Preparation of Wet Paste Sodium alginate 10 g Water 200 g The mixture of the above formulation was stirred and allowed to stand for 1 day to prepare a wet paste. Preparation of transfer sheet 55 g / m ² grade glassine paper, saturated copolyester resin Chemit R-50 (trade name, manufactured by Toray, softening point 14
0 ° C.) was laminated to a thickness of 30 μm. (Transfer Sheet A) Vylonal MD-1100 (trade name, manufactured by Toyobo Co., Ltd., softening point 160 ° C.), which is an emulsion of polyester resin, was laminated to the thickness of 3 to 6 μm on the glassine paper subjected to the release treatment. . (Transfer Sheet B) Preparation of Hot Melt Ink Emulsion of Synthetic Wax 10 g Acid Dye 1 g Kayanol Milling Red BW (trade name, manufactured by Nippon Kayaku Co., Ltd.) The mixture of the above formulation was sufficiently stirred for 10 minutes.

(Example 1) A hot-melt ink liquid was included in a brush and a fine image was drawn on the transfer sheet A and dried. Then, the transfer sheet A and the silk cloth were brought into close contact with each other and heated at 140 ° C. for 15 seconds, and then wet glue was applied to the silk cloth surface of the bonded body and dried.
Then, the joined body was steamed at 100 ° C. for 20 minutes, the transfer sheet was peeled off, and soaping was performed by rubbing and washing with a neutral detergent for 3 minutes. As a result, a silk cloth dyed in a dark color was obtained, in which fine lines having a width of about 0.1 mm were not bleeding at all, the picture was sharp, and the solid portion was not bleeding at all and was a uniform color.

(Example 2) A hot-melt ink liquid was included in a brush and a fine image was drawn on the transfer sheet B and dried. Then, the transfer sheet B and the silk cloth were brought into close contact with each other and heated at 160 ° C. for 15 seconds, and then a wet glue was applied to the silk cloth surface of the bonded body and dried, after which the base glassine paper of the transfer sheet was peeled from the bonded body. Next, the silk cloth was steamed at 100 ° C. for 20 minutes and then rubbed with a neutral detergent for 3 minutes for soaping. As a result, a silk cloth dyed in a dark color was obtained, in which fine lines having a width of about 0.1 mm were not bleeding at all, the picture was sharp, and the solid portion was not bleeding at all and was a uniform color.

(Embodiment 3) A polyvinyl alcohol sheet having a thickness of 40 μm, which contains a hot-melt ink liquid in a brush,
A fine image was drawn on Hi-Selon C (trade name, manufactured by Nigo Film Co., Ltd.) and dried. Then, Hycelon C and silk cloth were brought into close contact with each other, heated at 200 ° C. for 15 seconds with the graft paper interposed, and the bonded body was steamed at 100 ° C. for 20 minutes, and then the graft paper was peeled off, followed by neutral detergent. Soaping was performed by rubbing for 3 minutes. As a result, a silk cloth dyed in a dark color was obtained, in which fine lines having a width of about 0.1 mm were not bleeding at all, the picture was sharp, and the solid portion was not bleeding at all and was a uniform color.

(Embodiment 4) The hot-melt ink liquid was dried until it became a paste, then uniformly coated on a polyester ribbon of a word processor with a squeegee and then dried to form a hot-melt ink layer of 1 to 5 microns. An ink sheet was obtained. Then, in Examples 1, 2, and 3, an image was formed using a word processor WD-A600 (trade name, manufactured by Sharp Corporation) having a built-in serial print type hot-melt ink transfer printer in which the above-mentioned ink sheet was set instead of a brush. Except for drawing, the same test was repeated for the others, and the same result was obtained.

[0023]

As a result of the present invention, a pattern designed by a computer is color-separated and output to an ordinary thermal printer by using a dedicated ink sheet and a dedicated transfer sheet, whereby full-scale dyeing of a cloth of an arbitrary material is performed. It is now possible to dye products like patchwork. Further, the present invention is not limited to the positioning for color sample or sample production, and for the reason described in detail below, it has become possible to provide means which is significantly more practical than the inkjet method as a plateless printing method. That is, the injection nozzle used in the inkjet method has a high density,
Since it is difficult to manufacture in a wide width and there is no means for stable control, there is no choice but to adopt a serial print type printing method in which four color sets are scanned at right angles to the longitudinal direction.
Assuming a width of about 1 m, the current printing speed is 13 cm
/ Minute is the limit.

On the other hand, the thermal head used in the thermal printing method is easy to achieve high density and wide width, and is currently 4
Since a head of 00 dpi (16 lines / mm) and one A0 width is realized and the printing speed reaches about 4 cm / sec, the speed is an order of magnitude faster than the ink jet method even in the case of four-color printing. Moreover, since it is possible to print with one head in the longitudinal direction, it is an important advantage not to be overlooked that the unique scanning stripes are generated at all like the ink jet method and that beautiful dyeing similar to plate-making printing can be performed. . As described above, according to the present invention, it is possible to carry out plateless printing which is not limited to the color sample and sample preparation, and which can be sufficiently applied to the production in terms of quality, efficiency and cost.

Claims (4)

[Claims] 1. A hot-melt ink prepared by dispersing a water-soluble or water-dispersible dye in a wax is used to form an image on a transfer sheet having a thermoplastic resin laminated on a substrate, and then the transfer sheet and the cloth are heated. A wet transfer printing method, which comprises joining, then applying a wet paste to the cloth surface of the joined body, and then steaming and soaping. 2. A transfer sheet obtained by laminating a water-soluble thermoplastic resin on a recording surface using a hot-melt ink in which a water-soluble or water-dispersible dye is dispersed in a wax, and then the transfer sheet. And a cloth are heat-bonded, and then steaming and soaping are performed, which is a wet transfer printing method. 3. The wet transfer printing method according to claim 1, wherein the image forming method is a hot melt ink transfer method using a thermal printer. 4. The ink sheet used in the wet transfer printing method according to claim 1, 2 or 3, wherein a hot-melt ink in which a water-soluble or water-dispersible dye is dispersed in wax is applied to a film.