JPS58398B2 - Electrolytic recording method - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electrolytic recording method.

Although various methods are used for facsimile recording, typical examples of current recording methods that form images by applying electricity include discharge breakdown recording and electrolytic recording.

There are two types of electrolytic recording paper used in the electrolytic recording method: wet type and dry type.Dry type electrolytic recording paper is easier to handle and store than wet type electrolytic recording paper, and is expected to have a promising future. There is.

However, dry electrolytic recording paper has the disadvantage that it is difficult to achieve high recording density and it is difficult to obtain records with good contrast.

Furthermore, since electrolytic recording produces color by bringing the recording needle into contact with the recording layer and applying electricity, there are drawbacks such as the recording needle being severely worn out and the recording paper being left with scratches by the recording needle.

As a result of intensive studies to solve the above drawbacks, the inventors of the present invention found that
The above drawbacks can be overcome by coating electrolytic recording paper with a sheet made of thermoplastic resin and metal powder during electrolytic recording, and by changing the type of metal powder, it is possible to record on dry electrolytic recording paper. They discovered that the color of the displayed image changes, leading to the present invention.

That is, the gist of the present invention is to cover the surface of an electrolytic recording paper with a sheet made of 100 parts by weight of a thermoplastic resin and 30 to 1000 parts by weight of metal powder, and by contacting a recording needle thereon and energizing the recording needle. The invention resides in an electrolysis recording method characterized by recording electrolysis.

The thermoplastic resin used in the present invention includes all thermoplastic resins, such as vinyl chloride resin,
Examples include ethylene resin, cellulose acetate, acetal resin, and vinyl acetate resin.

Further, the metal powder used in the present invention means a metal in powder form, and the powder must have electrical conductivity.

It is preferable to use a powder of a highly conductive metal, and specific examples of suitable metal powders include powders of copper, aluminum, tin, molybdenum, silver, iron, nickel, zinc, and the like.

Further, metal powder coated with other metals can also be used, and for example, copper powder coated with silver is preferably used.

The metal powder preferably has a small particle size and a uniform particle size, preferably an average particle size of 10 microns or less.

In the present invention, one or more metal powders may be selected from the above metal powders as needed, and 30 to 1000 parts by weight are used per 100 parts by weight of the thermoplastic resin, more preferably 50 parts by weight. ~500 parts by weight.

In the present invention, the thermoplastic resin and the metal powder are made into a composition and formed into a sheet, but any method may be used to form the sheet, such as thermoplastic resin dissolved in a solvent. After uniformly dispersing the metal powder in a resin solution, it may be applied or cast onto a glass plate or the like and dried to remove the solvent.
Alternatively, a method of melt-molding using a roll or the like may be adopted.

The thickness of the sheet is not particularly limited, but is preferably several microns to several tens of microns.

The sheet made of a thermoplastic resin and metal powder in the present invention is a sheet made of the above-mentioned composition, but in order to eliminate the possibility that the sheet will cause cracks etc. and to improve its shelf life, a plasticizer or a sheet composition may be added. In order to prevent the resin from adhering to the recording needle, a fine powder filler commonly used as a filler, such as calcium oxide, calcium carbonate, silica, or kaolin clay, may be added.

The electrolytic recording paper used in the present invention is a recording paper that is generally used for electrolytic recording, and contains an electrolyte, a coloring agent, and water, and when energized, metal ions from the recording needle are transferred to the recording paper. Examples include wet-type electrolytic recording paper that develops color due to this, and dry-type electrolytic recording paper that has a layer containing a metal compound such as titanium oxide or zinc oxide that is electrochemically reduced to develop color on a conductive layer.

In the present invention, the metal powder-containing sheet is coated on the surface of the electrolytic recording paper, and a recording needle is placed on the sheet to perform electrolytic recording.

The method of the present invention is as described above, and since electrolytic recording is performed by coating the surface of electrolytic recording paper with a metal powder-containing sheet, there is little wear on the recording stylus, and there is no possibility that the electrolytic recording paper will be scratched by the recording stylus. It will disappear.

In addition, since the surface of the sheet has a large electrical resistance in the horizontal direction and a small electrical resistance in the longitudinal direction, the current emitted from the recording needle acts strongly in the downward direction of the scale, causing the recorded density to change during dry electrolysis recording. This will make the image darker and produce records with better contrast.

Furthermore, when dry electrolysis recording is performed by changing the type of metal powder contained in the sheet, the color development of the recording paper changes.

For example, when the surface of a dry electrolytic recording paper that has a coloring layer containing a dry electrolyte containing zinc oxide as a main component as a coloring agent is coated with the above sheet containing copper powder as a metal powder and electrolytically recorded, a reddish image is obtained. When silver powder is used instead of copper powder, a yellowish image is obtained, and when powders such as zinc, iron, nickel, molybdenum or aluminum are used, a blackish image is obtained.

Therefore, multi-color electrolytic recording can be achieved by changing the type of metal powder contained in the sheet in the portion that comes into contact with the recording needle and performing dry electrolytic recording.

In addition, since the metal powder-containing sheet is not changed in any way by just passing electricity through it, electrolysis can be recorded many times by replacing the electrolytic recording paper. It is also possible to perform electrolytic recording by feeding the sheets separately at different speeds, or by forming the sheet into a ribbon and partially covering the surface of electrolytic recording paper, as in a typewriter.

Next, examples of the present invention will be described.

Note that the term "parts" hereinafter simply means "parts by weight."

Example 1 100 parts of polyvinyl butyral (degree of polymerization 17
00, butyralization degree 66%) zinc powder (particle size 10-2
0μ) 460 parts ethanol 10
00 parts The mixture having the above composition was stirred well to sufficiently dissolve and disperse, and then cast onto a glass plate and dried to obtain a sheet with a thickness of 30 μm.

The above sheet was coated with dry electrolytic recording paper (manufactured by Tokushu Paper Co., Ltd., which has a recording layer approximately 12 μm thick consisting of a dry electrolytic material in which semiconducting zinc oxide is dispersed in a resin matrix). There is.

) and coated on the surface of the mimeograph paper making machine (Gesteratner).
When the sheet was supplied to Gester Toner 1100 (trade name, manufactured by Limited Company) and electrolytically recorded, the sheet did not have any through-holes, almost no bad odor was generated, and a record with a deep blackish-brown image was obtained.

Note that when recording was performed under the same conditions without coating the sheet, a recording having a pale black image was obtained.

Example 2 Electrolytic copper powder (particle size 1
A sheet was obtained in the same manner as in Example 1 except that 160 parts of 0μ or less) were used.

When the obtained sheet was electrolytically recorded in the same manner as in Example 1, a record with a deep reddish-brown image was obtained.

Note that no through holes were formed in the sheet, and almost no bad odor was generated during recording.

Example 3 Silver powder (particle size lOμ) was used instead of zinc powder in Example 1.
A sheet was obtained in the same manner as in Example 1 except that 210 parts of the following) were used.

Using the obtained sheet, electrolytic recording was carried out in the same manner as in Example 1, and a record having a deep yellow-brown image was obtained.

Note that no through holes were formed in the sheet, and almost no bad odor was generated during recording.

Claims (1)

[Claims] 1. 100 parts by weight of thermoplastic resin and 30 to 100 parts by weight of metal powder
An electrolytic recording method characterized in that electrolytic recording is carried out by covering the surface of an electrolytic recording paper with a sheet consisting of 0 parts by weight, contacting a recording needle thereon, and energizing the recording needle. 2. The electrolytic recording method according to claim 1, wherein the amount of metal powder used is 50 to 500 parts by weight. 3. The electrolytic recording method according to claim 1, wherein the metal powder is copper powder. 4. The electrolytic recording method according to claim 1, wherein the metal powder is silver powder. 5. The electrolytic recording method according to claim 1, wherein the metal powder is zinc powder. 6. The electrolytic recording method according to claim 1, wherein the electrolytic recording paper is a dry electrolytic recording paper.