JPS5810240B2 - Discharge recording method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a discharge recording method.

In recent years, with the rapid development of the information industry, information texture systems,
Various developments have been made regarding transmission systems and recording systems.

The electrical discharge recording system is one such system, and the electrical discharge recording system is widely used for recording on fuji, for making electric recording mimeograph paper in an automatic mimeograph paper making machine, and the like.

Discharge recording is performed by bringing the discharge recording needle into direct contact with the discharge recording medium.
This is done by destroying the recording layer of the discharge recorder by discharging it from a recorder, but when the recording layer is destroyed, a bad odor and soot are generated, and carbon black in the recorder is scattered. .

These soot and carbon black adhere to the recording medium and contaminate it, or adhere to the discharge recording needle, which prevents accurate discharge and causes a decrease in recording reliability.

Further, in discharge recording, since the discharge recording needle is scanned by directly contacting the recording medium, there is a drawback that the recording medium is scratched or hardened due to scanning, which impairs the naturalness of the recording medium.

In order to eliminate the above-mentioned drawbacks, for example,
A method of providing a dust collection body around the tip of the discharge recording needle as described in Japanese Utility Model Publication No. 0-9851, or polishing the discharge recorder as described in Publication of Utility Model Publication No. 40-9850. Although a method of installing a cleaning device has been proposed, it is impossible to completely prevent soot, carbon black, etc. from adhering to the discharge recording needle, and maintenance is troublesome.

In addition, a method of removing bad odors has been proposed in which an exhaust device with a filter containing a deodorizing agent is installed in the discharge recording device, but it is nearly impossible to completely remove bad odors, and the device is very expensive. be.

The purpose of the present invention is to eliminate the drawbacks of the conventional methods as described above, and to avoid the generation of bad odor, soot, and scattering of carbon black, and to prevent scratches from the scanning traces of the discharge recording needle on the discharge recording medium. The object of the present invention is to provide a discharge recording method that does not require any other methods.

That is, the gist of the present invention is that when performing discharge recording using a discharge recording needle on the surface of a discharge recording material, a conductivity imparting agent other than metal powder and a resin matrix are added between the surface of the recording material and the recording needle. The present invention provides a discharge recording method characterized by interposing a conductive resin sheet containing the above-mentioned conductivity imparting agent in a volume ratio of 4 to 70, and performing discharge recording without causing discharge breakdown.

The resin matrix used in the present invention may be any polymer resin that has film-forming ability and electrical insulation, and any polymer resin can be used.
In general, materials that have a high binding strength to the conductivity imparting agent, have high mechanical strength when formed into a sheet or film, and are flexible and strong are desirable, such as polyethylene, polypropylene, polyvinyl chloride, and polyacetic acid. Vinyl, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, polystyrene, polyacrylonitrile, polyvinyl acecool, polyacrylic acid alkyl ester, polymethacrylic acid alkyl ester, cellulose acetate, polyvinyl alcohol, carboxymethyl cellulose, gelatin Polyethylene, polypropylene, polyvinyl chloride, vinyl chloride-ethylene copolymer, polyvinyl acecool, and cellulose acetate are preferably used.

As the conductivity imparting agent used in the present invention, a good conductor other than metal powder is used.

As the conductivity imparting agent, for example, graphite, zeolite, conductive zinc oxide, stannic oxide, metastannic acid, cuprous phthalide, reduced titanium oxide, ferric oxide, etc. are preferably used.

The conductivity imparting agent has a uniform particle size and an average particle size of 0.
．． It is preferable that it is 2-20 microns.

In the present invention, a conductive resin sheet is used in which the conductivity imparting agent is dispersed in the resin matrix at a ratio of 4 to 70 volumes.

And if the resistance is too thick, a through hole will occur in the sheet,
On the other hand, if the conductive resin sheet is too small, the electrical current applied from the discharge recording needle will not reach the discharge recording material but will escape laterally because the conductive resin sheet has isotropy, resulting in a volume resistivity of 103.
It is preferred that the resistance be ˜10 7 Ω-cm.

Also, the sheet thickness is not particularly limited, but is 5 to 10
Preferably, it is made to be 0μ.

Further, the sheet forming method is not limited in any way, and any known method such as solution casting, emulsion casting, calendaring, extrusion, etc. may be employed.

The conductive resin sheet in the present invention is a sheet as described above, but the sheet eliminates the risk of cracking, etc.
Plasticizers can also be added to improve shelf life.

Examples of the plasticizer include dioctyl phthalate,
Those commonly used as plasticizers, such as dibutyl phthalate, dioctyl adibate, and triethylene glycol di-2-ethyl butyrate, are used.

The plasticizer is used in an amount of 15 parts by weight per 100 parts by weight of the resin matrix.
It is preferable to use within 0 parts by weight.

In addition, in the present invention, a fine powder filler is included in the composition for the purpose of imparting coating suitability when forming the composition into a sheet and preventing the sheet-constituting resin from adhering to the recording needle. You can also do it.

The amount of fine powder filler used is 10% of the resin matrix.
It is preferable that the amount is 100 parts by weight or less relative to 0 parts by weight.

Examples of the fine powder filler include calcium oxide, magnesium oxide, sodium carbonate, potassium carbonate, strontium carbonate, titanium oxide, barium sulfate, lithopone, basic magnesium carbonate, calcium carbonate, silica, and kaolin clay. can be given.

The structure of the conductive resin sheet is as described above, and in the present invention, the surface of the discharge recording material is coated with the conductive resin sheet, and a discharge recording needle is brought into contact thereon to perform discharge recording.

When a discharge recording needle is placed on the sheet and a discharge is generated, electricity passes through the sheet and destroys the discharge recording material directly under the recording needle.

Therefore, through holes are generated in the discharge recording material and recording is performed without any change in the sheet.

However, in the present invention, since the conductive resin sheet is coated on the surface of the discharge recording material and discharge recording is performed, the discharge recording needle does not come into direct contact with the discharge recording material. There will be no scratches from the scan marks.

Furthermore, during discharge recording, the recording material is destroyed by discharge, but the sheet coated on its surface remains unchanged, which prevents the bad odor generated during discharge destruction from spreading to the surroundings, and at the same time This prevents soot and carbon black from scattering or adhering to the discharge recording needle, thereby reducing the troublesome maintenance of the discharge recording needle.

Furthermore, according to the method of the present invention, soot and carbon black do not adhere to the discharge recording needle, making it possible to obtain highly reliable and clear recording.

In addition, since the conductive resin sheet is electrically isotropic, the electricity discharged from the discharge recording needle does not charge the sheet surface, so dirt and dust do not adhere to the sheet surface, resulting in highly reliable and clear images. An image is obtained.

In addition, since the sheet does not change at all during discharge recording, it can be used like carbon paper, and if the sheet is brought into contact with the surface of the discharge recording material and discharge recording is performed while sending both in the same direction, it can be easily and continuously recorded. Discharge recording can be performed, and recording can be performed more economically if discharge recording is performed by increasing the feeding speed of the discharge recording material from the sheet.

It is also possible to make the sheet into a ribbon and install it like a typewriter to record discharge.

Therefore, the discharge recording method of the present invention can be suitably used in Fudge measuring instruments, recorders, recording displays in computers, and the like.

Next, examples of the present invention will be described.

Hereinafter, parts simply mean parts by weight.

Example 1 100 parts of polyvinyl acecool (degree of polymerization 1
750, degree of acetalization 67%) Conductive zinc oxide (average particle size 1μ) 300 parts ethyl alcohol
Dissolving and dispersing 1,000 parts of a blend consisting of the above composition,
It was cast onto a glass plate and dried to obtain a conductive resin sheet with a thickness of 25 μm.

The volume fraction of conductive zinc oxide in the sheet was 37%, and the volume resistivity was 2.0×10 5 Ω-cm.

The above sheet was coated on the surface of discharge recording paper (manufactured by Tomoe Paper Manufacturing Co., Ltd.) and supplied to a facsimile receiver (manufactured by Matsushita Electric Transmission Co., Ltd., trade name: Panafax 1000D) to obtain a scanning line density of 4 l//.
When discharge recording was performed under the conditions of 1 mm, there was almost no odor and no soot, carbon black, etc. were scattered.

Further, no through holes were generated in the sheet.

The image density of the record recorded on the discharge recording paper is 0.3,
The resolution was 4 l/mm.

Example 2 100 parts of polyvinyl acecool (degree of polymerization 1
750, degree of acetalization 67%) graphite (average particle size 25μ, width of fixed carbon 94) 75 parts ethanol 1000 parts The formulation consisting of the above composition was dissolved and dispersed, cast on a glass plate and dried to give a thickness of 25μ. A conductive resin sheet was obtained.

The volume fraction of graphite in the sheet was 28.2%, and the volume resistivity was 5.6×10 3 Ω-cm.

When discharge recording was performed using the obtained sheet in the same manner as in Example 1, almost no bad odor was detected, and there was no scattering of soot, carbon black, etc.

Further, no through holes were generated in the sheet.

The image density of the recording obtained on the discharge recording paper was 0.3, and the resolution was 3 l/mm.

Claims (1)

[Scope of Claims] 1. When performing discharge recording using a discharge recording needle on the surface of a discharge recording material, a conductivity imparting agent other than metal powder and a resin matrix are added to the surface of the recording material and the recording needle. A discharge recording method characterized in that a conductive resin sheet containing 4 to 70 units of the conductivity imparting agent is interposed, and discharge recording is performed without damaging the sheet by discharge. 2. The discharge recording method according to claim 1, wherein the conductivity imparting agent has an average particle size of 0.2 to 20 μm. 3 The volume resistance of the conductive resin sheet is 103 to 10'Ω-
The discharge Wi recording method according to claim 1, which is Confucian.