JPH0454600B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for creating a master for color hexagonal printing that can easily produce multicolor printed matter. Recently, in response to display using a color display, it is desired to obtain a large number of hard copies that are equivalent to or similar to the display. In response to this demand, it is possible to use printers such as thermal or impact printers, but these printing methods require significantly more time than simple printing methods such as hex printing, and they also consume more ribbon. However, it has disadvantages such as increased costs due to To solve this problem, it is possible to create a master using a printer using stencil paper, but it is difficult to faithfully reproduce the so-called mixed colors, and it is difficult to create a master corresponding to each color and use these many masters in sequence. It is extremely difficult to use it to make hard copies of color displays because it must be printed and requires advanced printing techniques such as color matching and positioning. In view of these circumstances, the present invention was completed as a result of intensive research aimed at eliminating the above-mentioned drawbacks and performing multicolor printing using a single hexagonal printing master. reached. That is, the present invention achieves this object by providing yellow, magenta, and cyan hot-melt ink layers for hectographs side by side on a ribbon substrate, each color ink consisting of a dye and a vehicle; 1 to 20 parts of dye per 10 parts by weight
The ink heat melting temperature of each color is set to be lower for earlier transfer orders, and the ink vehicles of each color are compatible with each other when heat melted, and a thermal transfer medium is used. A predetermined color image is formed by thermally transferring the ink of each color to the master sheet base material in order of decreasing heat melting temperature, and then the master sheet base material on which the color image is formed is heated to ink different colors. The present invention relates to a method for creating a master for color hexagonal printing, which comprises thermally melting and mixing overlapping portions of ink on the master sheet base material. According to the method of the present invention, it is possible not only to print on a recording paper using individual hectograph inks of different colors, but also to simultaneously print a new color by mixing a plurality of different color inks. Can be done. In other words, when printing using the three primary colors of yellow, magenta, and cyan, the combination of the three primary colors makes it possible to perform hexagonal printing in seven colors, making color hard copies as easy to print as single-color hexagonal printing. You will be able to get a large amount of it. This is because Hecht printing is a system that dissolves the dye on the surface of the master image forming ink and transfers it to the recording paper for printing. The dyes of different colors are mixed together, and either they are dissolved individually and transferred to the recording paper in the form of minute dots, or they are mixed together during this melting and transfer and create a new color. It is assumed that this is because the color of In the present invention, yellow,
Magenta and cyan hectograph hot-melt ink layers are arranged side by side, and each color ink consists of a dye and a vehicle, and the ratio of the dye to 10 parts by weight of the vehicle is 1 to 20 parts by weight. A thermal transfer medium is used in which the melting temperature is set lower as the transfer order is earlier, and the vehicles of ink of each color are compatible with each other when thermally melted. With such a thermal transfer medium, even though each ink layer is superimposed one on top of the other and transferred onto the master by a thermal head, the ink layers are intermixed close to the surface of the master sheet substrate; It becomes possible to print on a large number of recording papers without changing the hue of the color mixture part midway through printing. Next, the present invention will be explained based on examples. Note that all parts below are parts by weight. First, the thermal transfer medium of the present invention will be explained. A strip of capacitor paper (thickness 15μ) is used as the base material.
m), and heat-melting yellow ink (2Y) and magenta ink (2M) are applied in the longitudinal direction of this base material.
and the same cyan ink (2C) were applied in a repeated pattern in this order. This ink was applied in an amount of about 6 g/m ² by hot melt coating. When used, the images were transferred to the master in this order. The composition and melting point of each color ink used above are
Shown in the table.

[Table] Each of these inks was prepared by thoroughly kneading each ink using three rolls and dispersing the dye in a vehicle. In the thermal transfer medium produced in this way, the thermal melting temperature of the hectograph ink layer is set to be lower as the hectograph ink layer is thermally transferred to the master sheet base material sooner. Therefore, Shinko Electric
When attached to the ink ribbon attachment part of Color Hard Copy CH-34 (product name) manufactured by Co., Ltd., and transferred a seven-color pattern created by computer graphics onto high-quality paper recording paper using a thermal transfer method, each ink The layers are heated and mixed in the overlapping area,
A master sheet with a new color different from the original color of the ink layer alone was created. Then, cut the master sheet made of high-quality recording paper to a certain size and use L505S manufactured by Dupro Co., Ltd.
It was attached to the master cylinder of a liquid copying machine to make liquid copies on plain paper. When color printing was performed on 100 sheets of plain paper by such copying, the resulting color prints had colors similar to the color pattern printed on the computer display. The present invention is not limited to the above-described embodiments, and may be modified as described below. () Carnauba wax, which is a vehicle component used in an ink composition, has the effect of increasing the melting point of the ink, but one or both of the following or carnauba waxes that have a similar or higher effect are also used. A mixture of these can be used. In other words, plant-based waxes such as oryquilily wax, chianderilla, and wood wax; animal-based waxes such as spermaceti wax and beeswax; mineral-based waxes such as montan, ozokerite, and ceresin; synthetic waxes such as ester waxes and oxidized waxes; They are paraffin wax and polyethylene wax. () Lanolin, which is a vehicle component used in ink compositions, has the effect of lowering the melting point of the ink, but one of the following types, each other, or a mixture with lanolin may be used as a vehicle component that has a similar or higher effect. Can be used. i.e. vegetable oils such as coconut oil, castor oil, rapeseed oil, semi-drying oil, mineral oils such as petrolatum, motor oil, spindle oil and beef tallow;
Fats and oils such as pork fat. () In order to adjust the melting temperature of the ink layer, it is common practice to adjust the mixing ratio of inks having considerably different melting temperatures, such as those in () and () above. However, the above (),
Since the vehicle materials shown in () and Table 1 have good compatibility with each other, different vehicle components can be selected from () or () for each color ink layer and used alone to prevent melting due to the difference in materials. It is also possible to set a temperature difference. () The melting temperature may be within the range of about 50°C to about 120°C, and the temperature difference may be within the range of about 0°C to about 20°C. If the melting temperature can be set within these ranges, the above-mentioned (),()and()
The materials of the vehicle materials and their mutual mixing ratios are not limited to those shown in Table 1 above. Since these materials and mixing ratios can be easily determined by simple experiments commonly used in the past, detailed explanations will be omitted. () In addition to the dyes shown in Table 1 above, the following dyes may be used as the dyes for each color. Yellow dye crampons Cachiron Yellow GLH (manufactured by Hodogaya Chemical Co., Ltd.) Sumiacryl Golden Yellow G (manufactured by Sumitomo Chemical Co., Ltd.) Flavin 10GFH (manufactured by Hodogaya Chemical Co., Ltd.) SWT Y-2 (Hodogaya Chemical Co., Ltd.) (manufactured by Kagaku Kogyo Co., Ltd.) Rhodamine 6GCP for magenta (manufactured by Sumitomo Chemical Co., Ltd.) SWT R-4 (manufactured by Hodogaya Chemical Co., Ltd.) Crampons Victoria Pure Blue BOH for cyan (manufactured by Hodogaya Chemical Co., Ltd.) Methylene Blue Conch (manufactured by Sumitomo Chemical Co., Ltd.) SWT B-1 (manufactured by Hodogaya Chemical Co., Ltd.) The mixing ratio of these colored dyes and vehicle is 1 to 20 parts of colored dye to 10 parts of Bexhil. A range of is preferred. If the amount of colored dye is less than 1 part, the print density will be significantly reduced and clear printing will not be possible with just one transfer. On the other hand, if it exceeds 20 copies, the fluidity of the ink will deteriorate, making it difficult for the inks to mix on the master sheet base material, and the heating temperature and heating time during thermal transfer will increase, making it difficult to create a master using a thermal printer. occurs. () Various extender pigments and other activators can also be mixed in the ink layer. () The base material of the ink ribbon is not limited to condenser paper, but also glassine paper, India paper, thin paper, and films such as polyester, polyimide, polycarbonate, polyamide, polystyrene, polypropylene, etc. can be used, and the thickness is approximately 1. A range of ~25 μm is appropriate;
Preferably, it is as thin as possible. () The base material for the master sheet is high-quality paper,
Any sheet that can generally be thermally printed, such as coated paper, various films, or synthetic paper, and that has printing durability may be used. () Regarding the ink layer application structure of the ribbon in the thermal transfer medium, the ink layers are not only provided sequentially in the longitudinal direction of the ribbon as in the above embodiments, but also multiple ink layers of different colors may be arranged side by side in the width direction. , it may be compatible with the printing means of the thermal printer used. Furthermore, the present invention employs the following means to increase the printing speed and create a master. That is, in the above, we explained the case where inks of different colors are thermally melted and mixed during thermal transfer by a thermal head, but if the printing speed of thermal printing is increased (the thermal energy received by the ink layer is (becomes lower),
The previously transferred ink may not be thermally melted and sufficient mixing may not be achieved during thermal transfer. In order to avoid such problems, in the present invention, after an image is once formed on a master sheet, the sheet is heated again to the ink's melting temperature to mix the ink sufficiently and uniformly. . As such a heating means, it is preferable to use a heat fixing roll used for electronic copying and the like. This type of roll is provided with a release layer on its surface, and the presence of the release layer prevents the hot melted ink from being squeezed out and allows sufficient mixing of the inks by reheating. The method of the present invention can also be applied to cases where the printing speed of thermal printing is increased.

Claims (1)

[Claims] 1 Yellow, magenta, and cyan heat-melt ink layers for hectographs are arranged side by side on a ribbon base material, and each color ink consists of a dye and a vehicle, and the ratio of the dye to 10 parts by weight of the vehicle is 1 to 20 parts by weight. , the thermal melting temperature of each color ink is set lower as the transfer order is earlier, and the ink vehicle of each color is compatible with each other when thermally melted. forming a predetermined color image by thermally transferring the ink of each color to the base material in order of decreasing thermal melting temperature;
A method for creating a color hexagonal printing master, which comprises heating a master sheet base material on which a color image has been formed and heat-melting and mixing overlapping portions of inks of different colors on the master sheet base material. .