JPH04214381A - Metal band plate printing and coating method - Google Patents

Abstract

PURPOSE:To enable printing to be continuously performed on a metal band plate by performing gravure printing and to simplify apparatuses of printing and coating lines when printing and varnishing coating are performed on one side surface of the metal band plate and successively coating is performed on the other side surface. CONSTITUTION:In gravure printing ink is forcibly pushed into a cell of a plate cylinder 2d. Besides, temperature of the ink of an ink fountain dish 2a, a pickup roll 2b and a fountain roll 2c is measured, and the ink is kept at specific temperature in a cooling device 2h. In addition to that, temperature of an outer surface of the plate cylinder is measured, and a transferring amount of the ink from an inside of the cell is increased by raising this temperature 20 deg.C or over higher than the ink temperature.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention involves printing and burnishing on one side of a metal strip, and painting on the other side.
Regarding the painting method.

0002

2. Description of the Related Art An example of a conventional printing and painting equipment line is shown in Japanese Patent Application Laid-Open No. 52-29312. As shown in Figure 3, this line consists of a device A that feeds out metal sheets cut into predetermined dimensions, and an offset printing device B.
, ink curing device C, burnishing paint coating device D,
The line is composed of a paint curing device E1, a metal sheet reversing device F, an internal paint coating device G, a paint curing device E2, a drying and baking device H, and a conveying device J that sequentially conveys the metal sheet to each of the above devices. UV cure paint is used for printing ink, and UV cure paint is also used for burnishing paint and inner surface paint.

0003

[Problems to be Solved by the Invention] The above-mentioned conventional printing and painting equipment lines use offset printing equipment, which has the drawback of requiring an enormous amount of line equipment, and because printing and painting are performed on metal sheets. However, there is a drawback that it takes time and effort to transport the metal sheet obtained by cutting the metal strip. The object of the present invention is to provide a printing and painting method that eliminates the above-mentioned drawbacks.

0004

[Means for Solving the Problems] The printing and coating method of the present invention includes a metal strip feeding device, a printing device, a pre-drying device, a burnishing paint coating device,
This is a method of printing and painting a metal strip by sequentially passing the metal strip through an inner surface paint coating device, printing ink and paint drying device, and the metal strip feeding device is an uncoiler.
This is gravure printing in which the printing device passes the metal strip to be printed between a metal plate cylinder and a backup roll. This is a metal strip printing and coating method characterized in that the ink adhering to the outer surface of the plate cylinder is scraped off with a ─ plate, and the temperature of the outer surface of the plate cylinder at this time is made 20°C or more higher than the temperature of the ink to be supplied. .

[0005]

[Function] In the method of the present invention, ink is forcibly pushed into the cells on the outer surface of the plate cylinder for gravure printing, and the pushed ink is heated by means such as plate cylinder heating.
By setting the temperature difference between the ink plate cylinder and the ink to 20° C. or more, the ink expands and the expanded ink can be transferred to the metal strip. This makes it possible to perform continuous gravure printing on metal strips. Therefore, according to the present invention, the printing device itself becomes simple, and furthermore, the device for conveying the metal strip to each device only needs an uncoiler and a coiler. ,
Equipment can be greatly simplified as an equipment line.

[0006]

[Embodiment] One embodiment of the present invention will be explained with reference to FIGS. 1 and 2. Figure 1 shows the line of this example, where 1 is an uncoiler;
2 is a gravure printing device, 3 is a pre-drying device, 4 is a burnishing paint coating device, 5 is an internal paint coating device, 6 is an ink paint drying device, 7 is a coiler, and 8 is a metal band plate, as shown in FIG. Each device was arranged in the order described above. All of the above devices except the gravure printing device 2 are well-known devices.

As shown in FIG. 2, the gravure printing apparatus includes a pick-up roll 2b that is partially immersed in ink 9 in an ink reservoir pan 2a and rotates counterclockwise, and a pick-up roll that rotates clockwise. A rubber fountain roll 2c receives the ink 9 from the fountain roll 2b, a metal plate cylinder 2d rotates counterclockwise and receives ink into a cell (not shown) in pressure contact with the fountain roll 2c, and a metal plate cylinder 2d rotates clockwise. It consists of a backup roll 2e that sandwiches and feeds the metal strip 8 between the plate cylinder 2d and a doctor blade 2f that contacts the outer surface of the plate cylinder at a point before the plate cylinder comes into pressure contact with the metal strip 8. The plate cylinder 2d has a cylinder 2 therein so as to heat the plate cylinder by passing hot water therein.
It has a layered structure, and a cooling device for cooling the ink is incorporated in the ink reservoir pan 2a. Also, plate cylinder 2
You may install an electric heater instead of hot water inside the room.

The heating device 2g provided in this embodiment is attached to the plate cylinder 2.
d The temperature of the outer surface is maintained at a predetermined temperature based on the signal from the temperature detection sensor 10 on the outer surface, and the cooling device 2h includes the pickup roll 2b, the ink temperature detection sensors 12 and 14 on the outer surface of the fountain roll 2c, and the ink reservoir tray. 2a
The ink in the ink reservoir tray 2a is maintained at a predetermined temperature based on the signal from the temperature detection sensor 11 inside. These reduce the temperature difference between the ink in the ink reservoir pan and the outside surface of the plate cylinder by 20
It was kept at ℃.

In the printing and painting equipment line of this embodiment, 0.
A 25 mm thick aluminum strip was transported at a speed of 150 m/min and red ink having an ink viscosity of about 130 cps (at 25°C) was printed on a plate cylinder 2d having 30,625 cells per inch square at 100°C. The printing ink is pre-dried for 1 second in a hot air pre-drying device 3, and then a well-known burnishing paint is applied on top of the printing ink. After applying the paint, it was dried for 19 seconds using a floating hot air dryer 6, and the aluminum strip was wound up. While unrolling this strip, I punched out a can lid. The printed surface (outer surface) of this lid was clear and free of scratches, and the inner surface was also free of scratches.

Table 1 shows the ink temperature, viscosity, plate cylinder temperature, and printing results.

[0011]

[Table 1]

As is clear from this, remarkable results were observed when the temperature difference between the ink and the plate cylinder was 20°C or more;
At temperatures below 20°C, sufficient results were not obtained.

In the above embodiment, one color printing was performed, but two to four gravure printing devices are arranged in series, and the printing start position of the plate cylinder is set for each plate cylinder, and wet printing and ink half printing are performed. By performing semi-wet printing while drying, it is possible to create a multicolor printing line.

[0014] In place of the above-mentioned gravure printing device, a metal plate cylinder having a cell size of #175 screen lines, an injection nozzle for spraying ink onto the metal plate cylinder at a pressure of 5 to 50 kg/cm2, and a plate cylinder are used. Clear printing was also achieved on a 0.25 mm pressure aluminum strip using a printing and coating equipment line equipped with a gravure printing device equipped with a doctor and a backup roll on the outer surface.

Table 2 shows the ink temperature, viscosity, plate cylinder temperature, and printing results in this case.

[0016]

[Table 2]

As is clear from Table 2, the method of supplying ink to the cells on the outer surface of the plate cylinder using a jet nozzle also has a remarkable effect when the difference between the ink temperature and the plate cylinder temperature is 20°C or more. Ta.

Furthermore, when the viscosity of the ink used in the method of the present invention is set to 90 cps or more, the effect of pushing and swelling the ink when scraping off the ink on the outer surface of the plate cylinder with a doctor blade is reduced to small cells with a large number of screen lines (#20
0) is also clearly recognized. Also, 500
If it exceeds cps, it will be difficult to enter the #250 cell, so the viscosity of the ink used in the printing device should be 90 to 50.
It is desirable that it be 0 cps.

[0019]

[Effects of the Invention] In the printing and painting method of the present invention, printing is performed using a gravure printing device that can directly print onto a metal plate from a plate cylinder, so compared to a line equipped with a conventional offset printing device, printing equipment is required. Moreover, by using gravure printing equipment, it is possible to print on metal strips at high speed, and the advantage is that the metal plate conveying device that was previously required can be replaced with an uncoiler and a coiler. We are prepared.

[Brief explanation of the drawing]

[Figure 1] One of the lines in which the printing and painting method of the present invention was implemented
An explanatory diagram of the arrangement of the embodiment.

FIG. 2 is an explanatory diagram of the configuration of the gravure printing apparatus shown in FIG. 1;

FIG. 3 is an explanatory diagram of a conventional line arrangement.

[Explanation of symbols]

1 is an uncoiler, 2 is a gravure printing device, 3 is a pre-drying device, 4 is a burnishing paint coating device, 5 is an inner surface coating device, 6 is a drying device, 7 is a coiler, 8 is a metal band plate,
2a is the ink reservoir plate, 2b is the pickup roll, 2c
is a fountain roll, 2d is a plate cylinder, 2e is a backup roll, and 2f is a doctor blade.

Claims (2)

[Claims] Claim 1: The metal strip is sequentially passed through a metal strip feeding device, a printing device, a pre-drying device, a burnishing paint coating device, an internal paint coating device, and a printing ink and paint drying device. A method of printing and painting,
The metal strip feeding device is an uncoiler, and the printing method is gravure printing in which the metal strip to be printed is passed between a metal plate cylinder and a backup roll. Forcibly push and supply,
Metal strip printing characterized in that ink adhering to the outer surface of the plate cylinder is scraped off with a doctor blade, and the temperature of the outer surface of the plate cylinder at this time is made 20°C or more higher than the temperature of the ink to be supplied. , painting method. 2. The method of printing and coating a metal strip according to claim 1, wherein ink having a viscosity of 90 to 500 cps is used in the printing device.