JPH0136096B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of creating a master for spirit printing by electrophotography and using this master for ordinary spirit printing.

Traditionally, spirit printing involves transferring paper or film coated with ink containing dye to master paper using a pressure-sensitive method such as carbon copying or a thermal copying method using an infrared light source to create a mirror image, which is then used as a spirit printing plate. The image is then run on a printer specially designed for spirit printing, and an appropriate amount of alcoholic solvent is applied to dissolve the dye in the mirror image, and the image is transferred to paper or the like for printing.

When making spirit printing plates using this method, type and handwriting can be made using traditional methods, but photographs, books, etc.
When a printed matter is used as a manuscript, it is necessary to use other printing methods, such as photoengraving, to make the plate and print it using an offset printing machine.

Furthermore, even in the case of typing, it has only been used in limited fields, such as when typing with a ribbon, a device for running the ribbon on the back side of the paper is required.

The present invention may be applied, for example, to
A master for spirit printing is created by creating a mirror image on the transfer plate of a PPC electrophotographic copying machine using a toner carrying an amount of alcohol-soluble spirit dye that can be used for spirit printing, and then taking out the transfer plate and fixing it with heat. Spirit printing, which is popular as a simple method of printing, is combined with electrophotographic copying technology to improve the quality to the level of electrophotography.

Furthermore, according to the present invention, compared to, for example, an offset printing machine that uses a printing machine that uses electrophotography, it is possible to print using a popular and simple printing method, so even if an amateur performs the printing, there are fewer technical failures. .

Next, the toner carrying a spirit dye used in the present invention is a toner made of carbon, dye, resin, etc., which is used in ordinary electrophotographic development, and has a spirit printing ink adhered to the surface of the toner, or a toner made of carbon, dye, resin, etc. Spirit printing ink is added to dye and resin, heated to melt and knead, and after cooling, the mixture is ground into fine powder.
Resins used for toners include polystyrene, polyvinyl chloride, polymethacrylate, diallyl phthalate, epoxy resin, fluorine resin, rosin, copal, phenolic resin, alkyd resin, coumaron resin, indene resin, or these resins. Copolymers can be used.

The main ingredients of spirit printing ink are alcohol-soluble spirit dyes, mineral oil, waxes, waxes, etc. The dyes include basic dyes, direct dyes, cationic dyes, and various oil-soluble dyes, and the waxes or waxes include carnauba wax, beeswax, Microcrystalline wax, etc. can be used.

Color printing is also possible by selecting the type of alcohol-soluble spirit dye in the spirit printing ink.

Furthermore, the content of the alcohol-soluble spirit dye supported on the toner used in the present invention is as follows:
In order to obtain a sufficient amount of alcohol eluted during spirit printing, the blending amount is high enough to enable spirit printing, and is characterized by being larger than the blending amount of dyes blended in ordinary toners.

The method for making a spirit printing plate of the present invention will be explained below with reference to Examples.

Example 1 A mixture of 100 parts by weight of bisphenol A type general-purpose epoxy resin (Epicoat 1004 manufactured by Shell Oil Co., Ltd.), 5 parts by weight of carbon black, and 3 parts by weight of nigrosine dye was melt-kneaded at 100°C in a roll mill. After cooling, the mixture was coarsely pulverized with a hammer mill, further finely pulverized with a vibrating mill, and then classified to a size of 5 to 20 μm.
We created fine particles with a particle size distribution of .

50 parts by weight of the following spirit printing ink was mixed with 100 parts by weight of the fine particles, and the ink was adhered to the surface of the fine particles by thorough stirring to prepare an electrophotographic toner carrying the spirit printing ink.

In this case, the spirit dye, that is, the crystal violet dye contained in the spirit printing ink on the toner surface is blended in a higher amount than the dye in a normal toner, so it is necessary to use an ink that shows sufficient alcohol elution during spirit printing as described below. It was hot.

Spirit printing ink Crystal violet dye 55 parts by weight Carnauba wax 10 Beeswax 5 Mineral oil 20 Next, add 5 parts by weight of this toner to an iron powder carrier 100
This is mixed with parts by weight to form a developer, which is set in a dry type electronic copying machine, and a mirror image is formed on the original plate having a photoconductive layer mainly composed of zinc oxide through charging, exposure, and development processes, and then heated. After fixing, a spirit printing original plate was prepared.

When this original plate was set on the master drum of a commercially available Spirit printing machine and printed, more than 300 clear prints were obtained.

Example 2 The mixture of the resin, carbon black, dye and spirit printing ink of Example 1 was melt-kneaded at 100°C in a roll mill, cooled, and then crushed and classified.
An electrophotographic toner consisting of fine particles with a particle size distribution of 5 to 20 μm was prepared.

In this case, since the spirit dye contained in the electrophotographic toner composed of fine particles was contained in a high amount, sufficient alcohol elution was exhibited during spirit printing.

Using this toner, a plate was made in the same manner as in Example 1, and spirit printing was performed.
You will get 1 sheet of printed matter.

Claims (1)

[Claims] 1 Load an electrophotographic copying machine with a toner consisting of fine particles mainly composed of resin and pigments that support an alcohol-soluble spirit dye on the surface or deep inside thereof in an amount sufficient for spirit printing, and transfer a mirror image onto the original plate using an electrophotographic process. A method for making a spirit printing plate, characterized by forming a spirit printing plate.