JPH11227326A - Method for using many times copied or printed sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize a recycling of a copied or printed sheet by using many times the copied or printed sheet. SOLUTION: Coloring matter dyes of three primary colors which develop colors in alkaline properties and an iodo-starch dye which develops black color are respectively regulated in a chromaticity and a viscosity with solvents. Then, they are set in an ink jet unit. A sheet is color printed by using a printer having the jet unit. When the printed sheet becomes unnecessary, the sheet is sprayed with organic or inorganic acid dilute solution or reducer solution, or coated with it by a roller. Or, it is fumigated by these drugs to simultaneously erase the four colors. After it is dried, the sheet is recycled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for making a copy or a printed sheet reusable.

[0002]

2. Description of the Related Art Certain chemicals or dyes change color due to chemical changes such as pH change and redox.
It is well known that it becomes colorless and transparent. For example,
(1) It is known that phenol phthalein, cresol phthalein, phenol red, cresol red, and phenol red sodium are red when alkaline, but become colorless when acidified or using a reducing agent.

(2) Naphthol phthalein, alpha naphthol phthalein, thymol phthalein, cyanine, brom cresol purple, etc. are blue when alkaline, but may become colorless when made acidic or using a reducing agent. Are known. (3) It is also known that nitrophenol is yellow when alkaline, but becomes colorless under acidic or reducing agents.

[0004]

The amount of paper used daily in various copying machines, light printing, and the like is enormous. However, in the case of a heat-sensitive system, a toner-using system, and the like, it is almost impossible to reuse waste paper. Due to the cost, it is not only a problem that a large amount of industrial waste is generated, but also environmental problems caused by the deforestation of the earth cannot be overlooked.

[0005] The present invention aims to save pulp resources.
It is an object of the present invention to provide a method for making it possible to use a sheet once copied or printed.

[0006]

The ink used for copying (including printing) is made colorless and transparent by changing the pH (hydrogen ion concentration) of the ink, or by oxidizing / reducing or other chemical changes. Thus, a method for recycling used paper is clarified.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on specific embodiments. (1) In the case of red-blue-yellow-black four-color color copiers or printers, phenol phthalein, cresol phthalein and its homologues, etc. It is red in such alkalinity, but it is colorless and transparent when it matches with an acidic or reducing agent, and a certain coloring agent and bleeding inhibitor shown below, and a solvent for adjusting viscosity are added to the ink jetter. .

(2) In the case of blue, dyes such as naphthol phthalein, brom motil blue, alpha naphthol phthalein, thymol phthalein, cyanine, ethyl bis-succinate and the like and their homologues are colored with alkali. A solvent to be described later is added and the ink jetter is mounted. (3) In the case of yellow, nitro-phenol or a homologue thereof is alkali-colored to yellow, and a solvent described below is added thereto, and the ink jetter is mounted.

(4) In the case of black, iodine ink is added to the starch paste, and 0.5 to 10% of glycerin is added thereto to develop a black color. The solvent described below is added, and the ink jetter is mounted. (5) Solvents to be attached to the ink jetter are propyl alcohol and glycol, ethylene glycol, butyl carbitol, butyl cellosolve, diethylene glycol, methoxy triethylene.
Glycol, benzine alcohol, glycerin, butoxy triethylene glycerol, triethylene
A mixture of a mixture of glycol, phenol, ethylene, glycol, ether, etc. mixed with a small amount of polyvinyl alcohol or starch paste for viscosity adjustment is used.

(6) The printer described above (1), (2), (3), and (4) is connected to a computer and connected to a computer.
Print in color with colors. (7) To erase the print after using the print, use oxalic acid,
Spray or dilute a diluted liquid such as acetic acid, tartaric acid, hydrochloric acid, sulfuric acid, nitric acid, sodium hypochlorite, hypo, hydrosulfite, hydrogen peroxide or a mixture of organic and inorganic reducing agents. The four colors can be erased all at once by applying or fumigation with these agents.

An example of the chemical reaction in the erasing step for making characters printed in black and brown colorless is as follows. I ₂ (Iodine) and Na ₂ S ₂ O ₃ (sodium thiosulfate) react to form N
aI becomes (sodium iodide) and NaS ₄ O ₆ as (sodium next thiosulfate).

[0012]

Embedded image Here, both NaI and NaS ₄ O ₆ are colorless and transparent,
The printed matter is erased and becomes colorless. (8) When erasing the print, dissolve a small amount of starch paste or polyvinyl alcohol in the erasing liquid shown in (7). Such a touch can be obtained.

[0013]

As described above, according to the present invention, after adjusting the chromaticity and viscosity of each of the three primary color dyes and the iodine starch dye which develops black with a solvent, they are set in an ink jetter. When the printed paper is no longer needed, spray it with an organic or inorganic acidic dilute solution or reducing agent solution, spray it with a roller, or apply it when the printed paper is no longer needed. It is a method to erase all four colors at once by fumigation with a chemical such as, and to reuse the paper after drying, so that the copied or printed paper can be used many times. It is easy to recycle, saves copy or print paper, makes effective use of wood resources,
It is preferable from the viewpoint of reducing waste and environmental problems.

Further, the present invention makes it possible to use a copy or printing paper using a coloring agent which is made black by adding 0.5 to 10% of glycerin or a homolog thereof to an iodine starch dye. The use of the method facilitates the recycling of copy or printing paper.

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[Procedure amendment]

[Submission date] January 28, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013]

According to the present invention, as described above, glycerin or a homolog thereof is added to the tri-primary color dye dye which is alkaline and the iodine starch dye which develops black by 0.5 to 10 g.
%, Adjust the chromaticity and viscosity of each colorant with a solvent, set it in an ink jetter, and print it on paper using a printer equipped with it, eliminating the need for printed paper. When it becomes, it is sprayed with an organic or inorganic acidic dilute solution or reducing agent solution, applied with a roller, or fumigated with these agents to erase all four colors at once, and after drying the paper This is a method to reuse the copied or printed paper so that it can be reused, the copy or printed paper can be easily recycled, the copy or printed paper can be saved, and the wood resources can be effectively used. Utilization, reduction of waste, and environmental issues are favorable.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Deleted

Claims (2)

[Claims] 1. After adjusting the chromaticity and viscosity of each of the three primary color dyes and the iodine starch dye that develops black with a solvent, the ink is set in an ink jetter, and then printed on a sheet of paper using a printer equipped with these. When the printed paper is no longer needed by color printing, it is sprayed with an organic or inorganic acidic dilute solution or reducing agent solution, applied with a roller, or fumigated with these agents. A method in which four colors are erased at a time, and a copied or printed sheet in which the sheet is reused after drying can be used many times. 2. A method of adding 0.5 to 10% of glycerin or a homolog thereof to an iodine starch dye so as to enable use of a copy or printed paper using a colorant that has developed a black color many times.