JPH04187261A - Device and equipment for continuously coating bandlike body - Google Patents

Abstract

PURPOSE:To completely prevent infiltration of coating and liquid cutting by equipping a slitlike nozzle lengthened in the width direction of a bandlike body in an equalizing chamber into which coating is introduced, and forming a lip arranged to the downstream side of a brush. CONSTITUTION:Lips 5a, 5b are formed of a brush lengthened to the opening direction of nozzle holes 4. Coating is extruded between the lips 5a, 5b from the nozzle holes 4 and passed through the small gaps of the brush and raised. Coating is uniformly supplied on the surface of a bandlike body allowed to abut against this brush. A coating equipment is shown wherein a roll coater B is arranged to the downstream side in the travelling direction of the bandlike body 7 in this coating device A. The roll coater B used herein is constituted so that a coating roll 8 is brought into contact with the bandlike body 7 and a pickup roll 10 immersed in a coating tank 97 is brought into contact with the coating roll 8, arranged and rotated following the coating roll 8. After preliminary coating is performed by the coating device A, normal coating is performed by this roll coater B. Thereby continuous coating is stably achieved at high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coating device that continuously applies paint to the surface of a strip of metal or synthetic resin foil or thin plate while running the strip.

(Prior art) Reverse coaters are widely used as this type of coating equipment, but since coating is likely to occur at high speeds, uneven coating is likely to occur, so it is recommended to apply preliminary coating to prevent uneven coating. Yes (see Japanese Patent Application Laid-open No. 119876/1983).

This preliminary coating is a method of spraying paint onto the board surface, that is, JP-A No. It is customary to use a spray nozzle such as that described in Japanese Patent No. 59058.

(Problems to be Solved by the Invention) When painting with a spray nozzle, the paint adheres unevenly between the portions of the painted surface facing the nozzle holes and the portions between these holes, resulting in uneven coating. This uneven coating can be improved by adjusting the orientation of the nozzle holes, but it is difficult to completely prevent the paint from going around or running out when the board width changes suddenly or the board meanders.

The object of the present invention is to propose a coating device which solves the above-mentioned problems and is particularly advantageous for preliminary coating.

(Means for Solving the Problem) The inventors conducted various experiments on a means for uniformly coating a moving strip with paint, especially a paint with low wettability to the board surface, and found that the coater We have confirmed that a so-called fountain coater is advantageously suitable for this type of coating, and as a result of repeated research on this fountain coater type coating equipment, we have found that by devising the lip of the fountain coater, it is possible to achieve coating without uneven coating. Heading, this invention was completed.

That is, the present invention is a fountain coater-type painting device that applies continuous coating to a traveling strip, and is provided with a pressure equalizing chamber into which paint is introduced, a slit-shaped nozzle extending in the width direction of the strip. A band-shaped body, characterized in that a pair of lips extending in the opening direction of the pinch nozzle hole are provided along the longitudinal direction of the slit-like nozzle, and at least the lip arranged on the downstream side in the running direction of the band-shaped body is formed of a brush. This is a continuous coating device.

Further, the present invention is a continuous coating facility that combines the above-mentioned coating device and a roll coater disposed on the downstream side of this device in the direction in which the strip travels.

(Function) The coating device according to the present invention uniformly extrudes the paint whose pressure has been equalized in the pressure equalizing chamber from the slit-shaped nozzle in its longitudinal direction, and then fills the gap between the surface of the strip and the slit-shaped nozzle to form a weir. The paint rises between the lips and fills the space between the lips, where the paint seeps into the brush that constitutes the lip disposed at least on the downstream side in the running direction of the strip, and the paint penetrates into the surface of the running strip. It is transferred to the surface of the strip while being agitated with the brush, and is reliably applied to the entire surface without leaking.

Further, if a roll coater is disposed downstream of the coating device in the traveling direction of the strip, it is possible to reapply and flatten the coating material, thereby making it possible to form a coating film of uniform thickness.

In other words, by placing the device of the present invention, which has an excellent ability to apply paint all over the board surface, in the front stage, and placing the roll coater, which has an excellent ability to uniformize the coating thickness and flatten the painted surface, in the rear stage, A good coating film can be obtained even with paints that have poor wettability and poor coating properties.

(Example) FIGS. 1(a) and 1(b) show a cross section of a coating device which is a preferred example of the present invention.

In the figure, 1 is a pressure equalization chamber, 2 is an introduction pipe that leads the paint into the pressure equalization chamber 1,
3 is a slit-shaped nozzle formed by a large number of nozzle holes 4 that eject paint in parallel in the axial direction of the pressure equalization chamber 1; 5a and 5b are a pair of lips provided along the nozzle with the slit-shaped nozzle 3 sandwiched therebetween; Reference numeral 6 denotes an edge mask that moves in the axial direction of the pressure equalizing chamber 1 and adjusts the number of nozzle holes 4 of the slit-shaped nozzle 3 to be opened.

The lips 5a and 5b are brushes extending in the opening direction of the nozzle hole 4, and the paint extruded from the nozzle hole 4 between the lips 5a and 5b rises through a small gap between the brushes and reaches the surface of the strip that comes into contact with the brush. This helps in evenly supplying paint to the area. In the illustrated example, both the lips 5a and 5b are brushes, but at least the lip disposed on the downstream side in the traveling direction of the strip may be a brush.

Furthermore, since the edge mask 6 is provided at a position facing the side end of the strip, it is possible to completely prevent the paint from going around. It is preferable to add a mechanism that can roughly detect the width and position when the band width changes or meander, and adjust the position of the edge mask. This makes it possible to prevent uneven coating due to paint going around or paint shortage.

Next, the coating device A described above in Fig. 2 is applied to preliminary coating,
A coating facility is shown in which a roll coater B is disposed downstream in the traveling direction of the strip 7 to the coating device. The roll coater B used here has a structure in which a pick-up roll 10 immersed in a paint tank 9 is placed in contact with the coke roll 8 brought into contact with the strip 6 and rotates with the coke roll 8. Coater B performs the main coating.

Furthermore, the coating equipment shown in FIG. 3 is of a type in which the strip 6 is passed through vertically, as opposed to the type shown in FIG. 2 in which the strip 6 is passed horizontally. 6
Preliminary coating is performed by coating device A, and then main coating is performed by roll coater B.

(Effect of the invention) According to this invention, particularly low wettability (for example, high viscosity,
It is possible to achieve coating without any leftovers or uneven coating, which are likely to occur when applying paint (such as high-density slurry paint) at high speed, and it is possible to stably achieve continuous painting at high speed.

[Brief explanation of drawings]

FIG. 1(a) is a cross-sectional view of the coating equipment according to the present invention, FIG. 1(b) is a cross-sectional view taken along line bb in FIG. 1(a), FIG. The figure is a schematic diagram of another painting equipment. 1... Pressure equalization chamber 2... Introducing pipe 3... Slit-shaped nozzle 4... Nozzle hole 5a, 5b... Lip 6
...Edge mask 7...Strip body meter...Coke roll 9...Paint tank 10...Pickup rolls 11, 12...Deflection roll

Claims (1)

[Scope of Claims] 1. A fountain coater type painting device that applies continuous coating to a traveling strip, which is equipped with a slit-shaped nozzle extending in the width direction of the strip in a pressure equalizing chamber into which paint is introduced; A pair of lips sandwiching the slit-shaped nozzle and extending in the opening direction of the nozzle hole are provided along the longitudinal direction of the slit-shaped nozzle, and at least the lip arranged on the downstream side in the running direction of the strip is formed with a brush. Continuous coating equipment for strips. 2. Continuous coating equipment for strips, which is a combination of the continuous coating device according to claim 1 and a roll coater disposed on the downstream side of this device in the traveling direction of the strips.