JPH0351591B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a ribbon used in a thermal recording device.

A conventional ribbon of this type will be explained with reference to FIG. In this figure, 1 is a ribbon, which is produced by coating one side of a base paper 2 with an ink 3 containing a disperse dye, a binder (for example, ethyl cellulose, etc.) using a coating method such as gravure or offset, and then drying. .

Since the ink 3 is coated on one side of the base paper 2 and dried as described above, the ink 3 is coated unevenly, that is, the surface of the ink 3 is not smooth, and recording unevenness occurs in the recorded image on the printing paper.
In addition, since the ink 3 is attached to the base paper 2, most of the ink 3 is transferred to the printing paper in one use, and the ribbon 1 and the printing paper are fused together. It has disadvantages such as being uneconomical as it cannot be used multiple times.

The present invention has been made in consideration of the above points, and provides a method for manufacturing a ribbon that can be used multiple times by infiltrating the inside of the base paper of the ribbon. The present invention will be explained below based on the drawings.

FIG. 2 is a schematic diagram showing the manufacturing process of an embodiment of the present invention, FIG. 3 is a sectional view of a suction roller, and FIG. 4 is a sectional view of a ribbon manufactured by the present invention.

In these figures, 1 is the ribbon, 2 is the base paper,
3 is ink, 4 is a corona charger that charges the ink 3, 5 is a heat roller equipped with heating means for heating the ink 3 to a predetermined temperature, and 6 is the heat roller 5.
An insulating layer 7 made of rubber or the like covers the outer periphery of the suction roller, and a large number of holes 7a (FIG. 3) are provided on the outer periphery of the suction roller. A power source 8 (several kV to several tens of kV) is applied to the corona charger 4 and between the rollers 5 and 7 to generate a high electric field. 9 is an elastomer calender roller, and 10 is a metal calender roller.

Next, a method for manufacturing the ribbon will be explained with reference to FIG.

First, ink 3 is applied to one side of base paper 2 and dried to produce ribbon 1 in the same manner as shown in FIG. after that,
The ribbon 1 is run in the direction of arrow A, and the ink 3 is charged by the corona charger 4. Then, when the heat roller 5 is rotated in the direction of arrow B and the suction roller 7 is rotated in the direction of arrow C, the ink is binder, then the disperse dye softens, sublimates or evaporates. On the other hand, the air inside the suction roller 7 is exhausted by a pump in the direction of arrow D as shown in FIG. 3, and the pressure inside is reduced.
Air is flowing in the direction of arrow E. Therefore, the ink 3 is polarized while being softened, sublimated, or evaporated by the heated roller 5, and the binder is applied to the base paper 2 at a low temperature (150 to 160°C) and the disperse dye is applied to the base paper 2 at a high temperature (180 to 210°C). The liquid is sucked into the inside by the suction roller 7 and penetrates. At this time, the ink 3 is charged by the corona charger 4, and its penetration into the inside of the base paper 2 is promoted by the lines of electric force of the electric field generated between the rollers 5 and 7 by the power source 8. Furthermore, when the calender rollers 9 and 10 are rotated in the directions of arrows B and C and the ribbon 1 is calendered with a pressure of, for example, 50 to 100 kg/cm ² , the ink 3 side, which is the surface of the ribbon 1, is made of elastomer. The ribbon 1 is made almost flat by the calender roller 9, and the back surface is made flat by the metal calender roller 10, and the thickness of the ribbon 1 is reduced and becomes dense (FIG. 4).

When the ribbon 1 is manufactured as described above, the ink 3 is sublimated or evaporated by the heat roller 5 and further sucked by the suction roller 7, so that it can penetrate into the inside of the base paper 2. When the ink 3 is charged by the corona charger 4 and sublimated or evaporated by the heat roller 5 and polarized, the electric field applied between the rollers 5 and 7 further transforms the ink 3 into lines of electric force. It is possible to promote penetration into the inside of the base paper 2 along the lines. Furthermore, when the ribbon 1 manufactured as described above is calendered using calender rollers 9 and 10, the ribbon 1 becomes dense, the front surface becomes almost flat, and the back surface becomes even more flat, so that the thermal conductivity of the ribbon 1 increases. get well.

In the above embodiment, the ink 3 was heated by the heat roller 5 equipped with a heating means, but it may also be heated by hot air or the like. Further, the outer periphery of the heat roller 5 is covered with an insulating layer 6 such as rubber.
However, the insulating layer 6 may be provided on the suction roller 7 side, or if the insulation between both rollers 5 and 7 is maintained by another method, the insulating layer 6 is not necessarily provided. Furthermore, the structure of the suction roller 7 is not limited to that shown in FIG. 3.

As explained above, in the ribbon manufacturing method of the present invention, the ink is sublimated or evaporated by heating the ink side of the ribbon using a heating means, and the ink is sucked from the opposite side of the ribbon by a suction roller, so that the ink is absorbed into the inside of the base paper. Penetration allows the ribbon to be used multiple times and prevents it from fusing with the printing paper, eliminating unevenness in recorded images on the printing paper.

In addition, in the ribbon manufacturing method of the present invention, the ink on the ribbon is charged with a corona charger, and then the ink side of the ribbon is heated with a heating means to sublimate or evaporate the ink and polarize it, and an electric field is applied. The ink can be further absorbed into the base paper by suctioning it with a suction roller from the opposite side of the base paper.

Further, in the ribbon manufacturing method of the present invention, the ink side of the ribbon is heated by a heating means to sublimate or evaporate the ink, and the opposite side of the ribbon is sucked by a suction roller to infiltrate the ink into the base paper, and then calendering is performed. Therefore, as the thickness of the ribbon decreases, it becomes denser, and both sides of the ribbon become flat, improving thermal conductivity. Therefore, it is not necessary to raise the temperature of the heat-sensitive head more than necessary during recording, which has the advantage of preventing fatigue of the heat-sensitive head and increasing the recording speed.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventional ribbon, Fig. 2 is a schematic diagram showing the manufacturing process of an embodiment of the present invention, Fig. 3 is a cross-sectional view of a suction roller, and Fig. 4 is a ribbon manufactured by the present invention. FIG. In the figure, 1 is ribbon, 2 is base paper, 3 is ink, 4
5 is a corona charger, 5 is a heat roller, 6 is an insulating layer, 7 is a suction roller, 8 is a power source, and 9 and 10 are calender rollers.

Claims (1)

[Claims] 1. A ribbon is formed by coating the surface of a base paper with an ink containing a disperse dye suitable for thermal recording devices, and the ribbon is heated by heating the surface of the ribbon with a heating means. Increasing the temperature to a temperature at which the ink applied to the surface sublimates,
A method for manufacturing a ribbon, characterized in that a suction means is brought into contact with the back surface of the ribbon so that the ink sublimated by the heating means permeates into the inside of the base paper. 2. A ribbon is formed by coating the surface of a base paper with an ink containing a disperse dye suitable for thermal recording devices, and the ink is applied to the surface of the ribbon by heating the surface of the ribbon with a heating means. Increasing the temperature to a temperature at which the ink sublimes,
A suction means is brought into contact with the back surface of the ribbon to allow the ink sublimated by the heating means to penetrate into the base paper, and then the front and back surfaces of the base paper are calendered. A method for manufacturing a ribbon. 3. After coating the surface of the base paper with an ink containing a disperse dye suitable for thermal recording devices to form a ribbon, and charging the ink coated on the surface of the ribbon with a corona charger,
A heating roller that abuts against the front side of the ribbon heats the ink until it sublimates, and a suction roller that abuts the back side of the ribbon moves the sublimated ink into the inside of the base paper. A method for manufacturing a ribbon, characterized in that an electric field is applied between the heating roller and the suction roller to further promote the penetration of the sublimated ink.