JPH01202482A - Static electricity eliminating back coating material for elongate film - Google Patents

Abstract

PURPOSE:To prevent the generation of static electricity or electrification due to the feeding of an elongate film and feed the film smoothly, by applying a conductive back coating material for static elimination to one side of the elongate film coated on the other side thereof with 8 functional coating material. CONSTITUTION:An elongate film such as an ink ribbon and a magnetic tape coated on one side thereof with a functional coating material for an ink layer, a magnetic base layer or the like is coated on the other side thereof with a static eliminating back coating material comprising a composite material of a conductive metallic oxide and an organic binder. With the back side of the ink ribbon coated with the back coating material to impart conductivity to the back side, static electricity is prevented from being generated due to friction between the ink ribbon and reels, a head, a cassette, guide rolls, pads or the like with which the ribbon makes contact during feeding thereof along a feeding passage, and electrification is prevented from occurring due to accumulation of static electricity to a high voltage. Therefore, the elongate film does not receive an electric shock even upon making contact with the cassette or the like, and the elongate film can be smoothly fed without any possibility of malfunction or breakage of an electronic circuit.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to an ink ribbon for printers, a magnetic tape for tape recorders, and other long and thin films that generate static electricity when they run. It is used as a back coat material to remove static electricity from a long thin film that removes static electricity from being charged on the long thin film or its reel.

(Conventional technology) Conventional ink ribbons for printers and magnetic tapes for tape recorders are wound on reels and set in the printer or tape recorder.

Alternatively, it is wound around a supply reel, passes through a required travel path, and is stored in a cassette in a state where it is stretched between one take-up reel.

And in the printer, follow the print.

In a tape recorder, an ink ribbon or magnetic tape is wound around a take-up reel through a required path during recording, playback, fast forwarding and rewinding.

The cassette case, supply reel, take-up reel, etc. mentioned above are usually made of non-conductive plastic, and the ink ribbon and long thin film of magnetic tape are also made of non-conductive plastic film. It's normal.

Furthermore, in order to apply appropriate tension to these long thin films while running, they are brought into contact with tension regulators, take-up clutches, magnetic head pressure pads, etc.
Alternatively, it is subjected to friction between a magnetic head, a print head, etc., and guided by a guide roller, etc.

[Problem that the invention seeks to solve]

In addition to running such ribbons and tapes, ribbons, tapes and heads, or cassette cases.

Static electricity is generated on the ribbon or tape due to friction between the pad, felt, and guide roller.

This static electricity can become charged and create a high voltage because ribbons, tapes, reels, cassettes, pads, and felt are made of non-conductive materials.

Due to this high voltage charge, when the user touches the cassette or reel, the 1! This may result in a shock, malfunction or damage to electronic circuits such as computers, or the running of ribbons or tapes may be obstructed.

In order to eliminate such problems that occur in electronic circuits, electronic circuits may be electrically treated by providing grounding or capacitors, or covering them with shield plates.

However, such processing has drawbacks such as complicating the circuit and configuration, increasing the size, and increasing cost.

There is also a method of applying an antistatic liquid made of a surfactant such as a sorbitan derivative to the surface of the cassette or reel, but this method creates a layer of hydroxyl groups on the surface and has a conductive effect, so it is environmentally friendly. Changes in humidity change the effectiveness of electrostatic discharge.

That is, there is a drawback that the effect disappears when the relative humidity is 30% or less.

Furthermore, there are methods of coating with carbon black, graphite vapor deposition, or organic binder, etc.
No titrable effect can be obtained.

[Purpose of the invention]

The present invention is intended to eliminate the above-mentioned problems caused by static electricity charging in conventional thin films such as ink ribbons and magnetic tapes. The purpose is to cover the vehicle with a film to ensure smooth running.

[Means for solving problems]

The present invention is aimed at achieving the above-mentioned objects.

It is applied to the ink surface of a long thin film such as an ink ribbon or magnetic tape, or the magnetic base surface, which is the opposite side to the functional coating surface, and is made of a composite material of a conductive metal oxide and an organic binder. This is achieved by using a back coat material for eliminating static electricity on a long film.

[Embodiments of the invention]

Examples of the present invention will be described below.

After coating one side of a film of non-conductive plastic such as polyester with functional paint such as printing ink or magnetic base, the functional paint of ink ribbon or magnetic tape cut to a predetermined width is applied. On the side that is not
A back coat material consisting of a composite material of metal oxide and organic binder is applied.

For this back coat material, Formulation Example-1 Indium trichloride (pentahydrate) 100 water
5゜Concentrated hydrochloric acid 104 Tin chloride 10 Formulation example-2 Tin dichloride 50 Acrylic resin 50 Aerosil 100 5 Acetone
105 Formulation Example-3 (Sintron C-4402100 Methyl Ethyl Ketone 200 is used, but other metal oxide elements include tin (Sn), indium (In), baladium (Pd), aluminum (
AI), titanium (T i ) silicon (SL), zinc (Zn
), lead (Pb), silver (Ag), #1 (Cu), etc. are used.

Further, as the organic binder, in addition to the above-mentioned formulation examples, polymer compounds such as polyester, nylon, acrylic, urethane, epoxy, melanin, silicone, amide, and imide are used.

And how to apply these composite materials.

Solvent coating method, chemical vapor deposition method, vacuum evaporation method, sputtering method, ion blating method, metal spraying method, etc. are used, but any other coating method can be used as long as it can form a uniform coating film. You may cry.

Furthermore, after forming a coating film by such a method, if necessary, a treatment such as heating may be performed to improve conductivity.

After applying the composite material of Formulation Example 1 to the back surface of the thermal transfer ribbon to a thickness of 0.2 μm using a solution spray method.

Heat treatment was performed at 80°C for 10 minutes.

After applying the composite material of Formulation Example-2 to a thickness of 0.1 μm on the back surface of the thermal transfer ribbon using a gravure coating method,
It was dried at 0°C for 1 minute.

After applying the composite material of Formulation Example-3 to the back surface of the thermal transfer ribbon to a thickness of 0.1μ by an offset coating method,
It was dried at 70°C for 1 minute.

The presence of tin oxide was confirmed in the coating, heat treatment, or drying example-1 of Formulation Examples-1 to 3, and the presence of tin oxide in Formulation Examples-2 and 3.

Such a composite material of metal oxide and organic binder has electrical conductivity, so even if an ink ribbon or magnetic tape tries to generate static electricity due to friction with a cassette, reel, guide roller, etc., its electrical conductivity will prevent it from generating static electricity. It will not get charged and become charged.

In addition, the static electricity that is generated and charged on the frictional object is prevented from becoming charged at a high voltage by performing corona discharge between the material and the composite material.

The thermal transfer ribbon coated with Formulation Example 1-3 was placed in a cassette and set in a printer, and a printing and running test was conducted. There were no problems with printing or winding due to breakage, ffi hitting when taking out the cassette, or irregular running of the ribbon.

〔Effect of the invention〕

The present invention provides electrical conductivity by applying the back coat material of the present invention to the back surface of an ink ribbon or magnetic tape coated with ink or a functional paint such as a magnetic base. Can be done.

Therefore, when an elongated film such as an ink ribbon or magnetic tape runs along its running path.

This prevents the generation of static electricity due to friction between the reel, head, cassette, guide roll, pad, etc. that comes in contact with it, and also works to remove the static electricity that has been charged, turning the static electricity into a high voltage and charging it. There's nothing to do.

Therefore, even if you touch the cassette etc. The thin film can run smoothly without being exposed to shock, and without electronic circuits malfunctioning or being damaged, while ink ribbons can cause printing defects, and magnetic tape can cause deterioration in sound quality such as wow and flutter. It has the effect that there is no

Patent applicant: Mitsubishi Pencil Co., Ltd.

Claims (1)

[Claims] It is applied to the ink surface of a long thin film such as an ink ribbon or magnetic tape, or the magnetic base surface, which is the opposite side to the functional coating surface, and is made of a composite material of a conductive metal oxide and an organic binder. A long thin film antistatic back coat material characterized by: