JP3002359B2 - Roller curtain coater equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller curtain coater using a belt as an object to be coated.

[0002]

2. Description of the Related Art Conventionally, as a coating technique using a curtain flow, a slit method and an overflow method are known. For example, the slit method supplies paint to the head,
Discharge from the slit gap to form a curtain. In this method, a predetermined coating film thickness is obtained by adjusting the coating viscosity, the slit interval, and the like. In the overflow method, a paint, which is adjusted to an appropriate paint viscosity by changing properties such as surface tension and viscosity of the paint while diluting the paint with a solvent, is caused to overflow from a container into a curtain shape. In this method, a predetermined coating film thickness is obtained by adjusting the coating viscosity and the like.

Further, in recent years, a curtain coater using a roller system (roller curtain coater) has been developed.
This roller curtain coater discharges paint whose viscosity has been adjusted as necessary from a paint supply device arranged above the roll between a rubber or metal paint roll and a metal doctor roll, and contacts the paint roll. Scrape with a blade. The scraped paint flows down along the blade to form a paint curtain, and is applied to a steel plate or the like passing below the blade.

FIG. 3 shows a conventional roller curtain coater apparatus.
Shown in The paint discharged from the paint supply device (not shown) is stored between the paint roll 1a and the doctor roll 1b, and is rotated from the gap between the paint roll 1a and the doctor roll 1b by the rotation of the paint roll 1a. It is discharged downward along. Reference numeral 2 denotes a blade arranged in the axial direction of the coating roll 1a, which scrapes paint from the surface of the coating roll 1a to form a coating curtain 7 and allows the coating material 6 to fall freely from above a steel plate which is the object 6 to be moved. Painting is done. The remaining paint scraped off by the blade is stored in a paint tank (not shown) provided below.

[0005] This roller curtain coater is used to control the rotation speed of the coating roll 1a, the coating roll 1a and the doctor roll 1a.
By adjusting the gap with b, a paint curtain 7 having a desired film thickness can be obtained. As described above, the curtain coating device is configured by a device that performs coating by freely dropping the paint curtain 7 from above the steel plate, which is the object 6 to be moved.

With this configuration, when the coating of the workpiece 6 is started or when the coating is interrupted or terminated, the paint receiving pan 3 is moved backward and forward using the paint receiving pan forward / backward movement mechanism 4 (see FIG. 1). The paint curtain 7 is changed from the blocking state to the falling state or from the falling state to the blocking state while the paint curtain 7 is being moved forward (to the side opposite to the coating curtain 7) or forward (to the side of the coating curtain 7). Has received all of the paint curtain 7 in the paint receiving pan 3. The paint in the paint receiving pan 3 is connected to the paint outlet 5 from the lower part of the paint receiving pan 3 so that the paint is discharged. In addition, it is the actual state that the apparatus is conventionally constituted by one unit including the paint receiving pan 3, the paint receiving pan forward / backward moving mechanism 4, and the paint outlet 5.

[0007]

When the coating of the object to be coated 6 is started or the coating is interrupted or terminated by the above-described roller curtain coater, the paint receiving pan 3 is moved backward and forward using the forward / reverse mechanism 4 (see FIG. 1). Opposite the paint curtain 7)
Alternatively, the paint curtain 7 is moved forward (on the side of the paint curtain 7) to change the paint curtain 7 from the shut-off state to the falling state or from the falling state to the cut-off state. The tip (the paint curtain 7 side) drags the paint curtain 7, and in the case of paint with low viscosity, the curtain 7 is torn off from the center of the dragged portion and falls in a thick film state. The thick paint that has been dragged away from the tip of the paint receiving pan 3 falls onto the body 6 to be coated, and forms a thick film portion (at the start of painting, the thick film portion 9 at the start of painting). The thick-film portion 9 generates cracks in the subsequent drying and baking in an oven, or becomes unbaked when the film thickness is extremely large, fouling the inside of the oven and causing poor paint appearance of the object 6 to be coated. Also, line troubles such as contamination of the line roll after the oven were often caused.

Further, as shown in Japanese Utility Model Application No. 4-19761, the shape of the cut portion of the paint curtain 7 at the tip (the paint curtain 7 side) of the paint receiving pan 3 has an inner angle of 90 to 180 ° or a smooth circular inclined shape. Although a proposal has been made to make a configuration, the optimum shape differs depending on the paint properties and the thickness of the paint curtain 7, and the optimum shape is obtained for a certain paint properties and the thickness of the paint curtain 7. Also, in general, the same roller curtain coater performs many types of coating, for example, from low viscosity to high viscosity with viscosity, or coating thickness from thin film to thick film. In addition, the tip shape of the paint receiving pan 3 needs to be replaced, and the operation is complicated and not practical.

According to the present invention, in order to solve these problems, the thick film portion of the paint generated when the paint curtain is changed from the shut-off state to the flow-down state or from the flow-down state to the cut-off state does not become a line trouble after the oven. It is an object of the present invention to provide a roller curtain coater having a mechanism for correcting the film thickness to an appropriate thickness or less.

[0010]

DISCLOSURE OF THE INVENTION The present invention advantageously solves the problems of the prior art. To achieve the above object, the present inventors have made intensive efforts, and as a result, the paint curtain has been moved from the closed state. An apparatus capable of correcting a thick film portion of paint generated when changing from a flowing state or a flowing state to a blocking state to an appropriate film thickness or less so as not to cause a line trouble after an oven. The main points are as follows: (1) The paint is scraped off from the surface of the coating roll with a blade.
To form a paint curtain and apply this paint curtain
A roller curtain coater apparatus for forming a coating film on the object to be coated by flow down Butsujo, with disposing the curtain receiving apparatus having a discharge port of the forward-reverse mechanism and coating between the blade and the object to be coated, the In the direction of travel of the painted body ,
A roller curtain coater device comprising a paint film leveling device having a paint thick film portion leveling function and a paint drop prevention function ; (2) a paint film leveling device, To do
Elevating leveling roll or leveling blade and leveling roll
Or, it can go in and out of the leveling line of the leveling blade.
A roller curtain coater according to (1), characterized in that it comprises a paint fall prevention shutter having a mechanism; and ( 3 ) a cleaning pan capable of applying a paint cleaning liquid to the leveling device before use. (2)
The roller curtain coater device described in the above.

[0011]

The present invention will be described below in detail with reference to the drawings.
FIG. 1 is a view of a roller curtain coater apparatus by a roll leveling method according to the present invention immediately after the start of coating. The coating material stored between the coating roll 1a and the doctor roll 1b is discharged downward along the surface of the coating roll 1a from the gap between the coating roll 1a and the doctor roll 1b by the rotation of the coating roll 1a. The discharged paint is scraped off from the surface of the coating roll 1a by the blade 2 to form a paint curtain 7 and flows down. The paint curtain 7 is allowed to freely fall from above the steel plate as the object 6 to be moved. To paint the steel plate surface.

A paint pan 3 having a paint pan forward / backward movement mechanism 4 is provided between the blade 2 and the steel plate as the workpiece 6.
Is arranged. Also roll leveling device is disposed in the traveling direction of the object to be coated 6. Roll leveling device, leveling roll 11, a leveling roll driving apparatus comprising a leveling roll lifting mechanism 12 and the leveling roll forward-reverse mechanism 13, the cleaning roll 14, the cleaning pan 15, the cleaning liquid supply port 16, the cleaning liquid discharge port 17 and the leveling roll cleaning equipment consisting of the shielding plate 31 of the cleaning liquid for scattering prevention, and is composed of a coating material fall prevention equipment to be coated article 6 from smoothing roll of shutter 41 and the shutter forward-reverse mechanism 42 I have.

Before the start of coating, that is, while the paint curtain 7 is shut off, the paint curtain 7 is received by the paint receiving pan 3 advanced by the paint receiving pan forward / backward movement mechanism 4, and the paint in the paint receiving pan 3 is subjected to the paint receiving. Paint outlet 5 from the bottom of bread 3
To prevent the paint from being discharged and falling onto the object 6 to be coated. The leveling roll 11 is raised and retracted by the leveling roll elevating device 12, and the shutter 41 is moved forward between the leveling roll 11 and the object 6 by the shutter forward / reverse mechanism 42. As a result, the paint adhered to the leveling roll 11 is prevented from falling onto the object 6 to be coated. At this time, the leveling roll 11 is immersed in the cleaning pan 15 if necessary, or
1 is located at the top.

When the coating is started, the paint receiving pan 3 is moved backward by using the paint receiving pan forward / backward moving mechanism 4, and the paint curtain 7 is changed from the cut-off state to the flow-down state.
At this time, the tip of the paint receiving pan 3 (the paint curtain 7 side) drags the paint curtain 7, and in the case of a paint having a low viscosity, the curtain is torn from the center of the dragged portion and falls in a thick film state or a paint having a high viscosity. Then, the paint curtain 7 is dragged, and the paint in a thick film state detached from the tip of the paint receiving pan 3 falls on the object 6 to be formed, forming a thick film portion 9 at the start of coating.

Before the coating start tip thick film portion 9 reaches the position of the leveling roll 11, the shutter 41 is retracted by the shutter forward / reverse mechanism 42, and the leveling roll 11 is lowered by the leveling roll elevating device 12, It is in contact with the object 6 to be coated. When the coating start tip thick film portion 9 reaches the leveling roll 11, it is leveled between the leveling roll 11 and the object 6 to a film thickness that does not cause burning or baking by drying and baking in an oven. It is averaged thinly and exits from the leveling roll 11. Thereafter, the leveling roll 11 is raised and retracted by the leveling roll elevating device 12, and the shutter 41 is advanced between the leveling roll 11 and the object 6 by the shutter forward / reverse mechanism 42. The paint adhered to the leveling roll 11 does not fall on the object 6 to be coated.

The leveling roll 11 to which the paint has adhered is cleaned as required. The cleaning method may be any method,
For example, the leveling roll 11 is retracted by the leveling roll forward / reverse mechanism 13, retracted to the upper portion of the cleaning pan 15, further lowered by the leveling roll elevating device 12 to an intermediate height (cleaning height) position, and The cleaning is performed by driving the cleaning roll 14 and bringing the leveling roll 11 and the cleaning roll 14 into contact with each other and driving them. In addition, a shielding plate 31 is arranged below the cleaning pan 15, and the cleaning liquid does not fall on the object 6 to be coated. This operation may be automatic or manual.

In this manner, the coating start tip thick film portion 9 generated at the start of the coating is prevented from being burnt or unburned by the subsequent drying and baking in the oven, thereby contaminating the inside of the oven and coating. The appearance of the paint on the body 7 was inferior, or the line roll after the oven was contaminated, and no line trouble was caused.

If the cleaning liquid is applied to the surface before the leveling roll 11 is brought into contact with the thick end portion 9 of the tip, smoother leveling can be performed. The same applies to when the coating is interrupted or terminated.

FIG. 2 is a view of the roller curtain coater apparatus by the blade leveling method according to the present invention immediately after the start of coating. The configuration of the roll leveling method and the leveling device is the same as the roll leveling method except for the difference between the roll and the blade. In this case, cleaning of the blade 21 may be performed by any method, for example, ultrasonic cleaning or the like (not shown) is allowed.

[0020]

According to the present invention, the thick film portion of the paint which is generated at the start of coating, at the time of coating interruption or at the end of coating, may be burnt or unburned by the subsequent drying and baking in an oven. Is prevented, and the inside of the oven is soiled,
The occurrence of line troubles by causing poor paint appearance on the object to be coated or contaminating the line roll after the oven is eliminated.

[Brief description of the drawings]

FIG. 1 is a view of a roller curtain coater apparatus by a roll leveling method according to the present invention immediately after the start of coating.

FIG. 2 is a view of a roller curtain coater apparatus by a blade leveling method according to the present invention immediately after the start of coating.

FIG. 3 is a view of a conventional roller curtain coater immediately after the start of coating.

[Explanation of symbols]

 1a Paint Roll 1b Doctor Roll 2 Blade 3 Paint Receiving Pan 4 Paint Receiving Pan Forward / Backward Mechanism 5 Paint Receiving Pan Paint Outlet 6 Painted Object 7 Paint Curtain 8 Paint Pool 9 Paint Start Tip Thick Film 11 Smoothing Roll 12 Smoothing Roll raising / lowering mechanism 13 Leveling roll forward / backward moving mechanism 14 Cleaning roll 15 Cleaning pan 16 Cleaning liquid supply port 17 Cleaning liquid outlet 18 Cleaning liquid 21 Leveling blade 22 Leveling blade raising / lowering mechanism 23 Leveling blade forward / backward moving mechanism 31 Shielding plate 41 Shutter 42 Shutter Forward and reverse mechanism

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Mochida 1 Kimitsu, Kimitsu City, Chiba Prefecture Nippon Steel Corporation Kimitsu Works (56) References JP-A-1-299667 (JP, A) Special Table Hei 2-503884 (JP, A) Tables Hei 5-501987 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05C 5/00 103 B05D 1/30 B05D 7/00- 7/14

Claims (3)

(57) [Claims] (1) A paint is applied from the surface of a coating roll by a blade.
Scrape to form a paint curtain, this paint curtain
A roller curtain coater apparatus for forming a coating film on the object to be coated by flow down onto the material to be coated, and disposing the curtain receiving apparatus having a discharge port of the forward-reverse mechanism and coating between the blade and the object to be coated A roller curtain coater device further comprising a coating film leveling device having a coating thick film portion leveling function and a coating falling prevention function on the side of the object to be coated in the traveling direction. 2. A paint film leveling device for leveling a paint thick film portion.
A leveling roll or leveling blade that can be raised and lowered
It can move in and out of the elevating line of the roll or leveling blade
The roller curtain coater device according to claim 1, further comprising a paint fall prevention shutter having a suitable forward / backward movement mechanism . 3. A roller curtain coater according to claim 2, further comprising a cleaning pan for applying a paint cleaning liquid to the leveling device before use.