JPH078877A - Roller curtain coater device - Google Patents

Abstract

PURPOSE:To prevent the drop of a coating material to a material to be coated by disposing a curtain receiver and a shutter above and below with a coating material curtain as a boundary, allowing the coating material curtain to flow down or to cut off the curtain with the curtain receiver and receiving the coating material of the curtain receiver with the shutter. CONSTITUTION:The coating material 8 is discharged downward from the spacing between a rotating coating roll 1a and a doctor roll 1b. The discharged coating material 8 is scraped off by a blade 2 and is made to flow down by forming the coating material curtain 7; thereafter, the coating material is applied on the front surface of the traveling material 6 to be coated. A coating material receiving pan 3 is positioned by a forward and backward moving mechanism 4 for the pan in a retreat position where the coating material curtain 7 is not shut off. On the other hand, the shutter 13 is positioned right under the coating material receiving pan 3 by this forward and backward moving mechanism 14 without shutting off the coating material curtain 7, by which the drop of the coating material 8 stuck to the coating material receiving pan is received. As a result, the dropping of the coating material 8 infiltrating to the outside of the coating material receiving pan 3 to the material 6 to be coated is completely prevented.

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 device having a belt-shaped body as an object to be coated.

[0002]

2. Description of the Related Art Conventionally, a slit method and an overflow method are known as a coating technology by curtain flow. For example, the slit method supplies paint to the head,
Discharge from the slit gap to make a curtain shape. In this method, the paint viscosity and slit spacing are adjusted to obtain a predetermined coating film thickness. Further, in the overflow method, while the paint is diluted with a solvent, properties such as surface tension and viscosity of the paint are changed to adjust the paint viscosity to an appropriate value, and the paint is overflowed from a container to form a curtain. In this method, the paint viscosity is adjusted to obtain a predetermined coating film thickness.

Further, in recent years, a roller type curtain coater (roller curtain coater) has been developed,
This roller curtain coater discharges the paint whose viscosity is adjusted beforehand as needed from the paint supply device installed on the upper part of the roll between the rubber or metal coating roll and the metal doctor roll, and makes it contact the coating roll. Scrape with a blade. The scraped paint is a method of flowing down along a blade to form a paint curtain, and applied to a steel plate or the like passing below the blade.

FIG. 4 shows a conventional roller curtain coater device.
Shown in. The coating material discharged from the coating material supply device (not shown) is stored between the coating roll 1a and the doctor roll 1b, and the coating roll 1a is rotated by the rotation of the coating roll 1a.
And the doctor roll 1b is discharged downward along the surface of the coating roll 1a. Reference numeral 2 denotes a blade arranged in the axial direction of the coating roll 1a, scraping the coating material from the surface of the coating roll 1a to form a coating curtain 7 and allowing it to fall freely from above the steel plate, which is the object 4 to be coated. Is painted. The remaining paint scraped off by the blade is stored in a paint tank (not shown) provided in the lower part.

This roller curtain coater uses the rotation speed of the coating roll 1a, the coating roll 1a and the doctor roll 1
The paint curtain 7 having a desired film thickness can be obtained by adjusting the gap with b. As described above, the curtain coating device is constituted by a device for performing free coating by dropping the paint curtain 7 from above the steel plate which is the object 6 to be coated.

Under this structure, when the coating of the object 6 is started or the coating is interrupted or terminated, the paint receiving pan 3 is moved backward and forward by using the paint receiving pan forward / backward moving mechanism 4. The paint curtain 7 is set to the flow-down or blocking state by advancing (opposite side of the paint curtain 7) or advancing (on the side of the paint curtain 7). It is received in the pan 3. The paint in the paint receiving pan 3 is connected to the paint discharge port 5 from the lower part of the paint receiving pan 3 so that the paint is discharged. Moreover, conventionally, in reality, it is composed of one unit including the paint receiving pan 3, the paint receiving pan forward / backward moving mechanism 4, and the paint discharge port 5.

[0007]

The paint receiving pan 3 is used when starting the coating of the object 6 to be coated or when the coating is interrupted or finished by the above-mentioned roller curtain coater device.
Using the forward / backward movement mechanism 4, the paint curtain 7 is moved backward (opposite the paint curtain 7) or forward (the paint curtain 7 side) to release or cut off the paint curtain 7. However, in the roller curtain coater device described above. When the end (paint curtain side) of the paint receiving pan 3 passes directly under the paint curtain, the paint is outside the paint receiving pan 3 (paint curtain side).
On the back side, and dripping on the coated object 6 over time,
During coating, this coating material drop caused a poor surface appearance of the coating film, and even during non-painting, it dropped onto the strip (steel plate) running and stopped at the bottom, often causing line troubles. . In addition, Jpn.
Proposal has also been made of disposing two pairs of forward / backward moving mechanisms and a curtain receiving pan having a discharge port for paint in the opposite direction at upper and lower step positions with a paint curtain as a boundary between the blade and the object to be coated as in No. However, at the start of painting, the upper and lower paint receiving pans are retracted (on the opposite side of the paint curtain 7) by using the forward / backward movement mechanism to release the cutoff of the paint curtain. ) Passes directly under the paint curtain, the paint goes around the outside of the upper paint receiving pan (on the side of the paint curtain) and drips onto the object 6 to be coated over time. It is impossible to prevent the occurrence of poor surface appearance.

In order to solve the above problems, the present invention applies a coating material to the outside of the paint receiving pan 3 (on the side of the coating material curtain) when the coating material curtain is unblocked or cut off. An object of the present invention is to provide a roller curtain coater device that completely shuts it off so that it does not drop on an object, and that it does not fall onto a strip (steel plate) that is running or stopped even during non-painting. .

[0009]

SUMMARY OF THE INVENTION The present invention advantageously solves the problems of the prior art, and as a result of the inventors' earnest efforts to achieve the above object, the paint curtain is unblocked or released. When shutting off, the paint lining the outside of the paint pan 3 (on the side of the paint curtain) is completely shut off so that it does not fall onto the object to be coated during painting, and it is running or stopped at the bottom even when not painting. A device capable of completely shutting it off so that it does not fall onto a strip (steel plate) inside, and the gist of the invention is (1) passing through a paint curtain to be dropped onto an object to be coated. In a roller curtain coater that forms a coating film, it has a forward / backward mechanism and a curtain receiver and forward / backward mechanism with a paint discharge port with the paint curtain as a boundary between the blade and the object to be coated. Roller shutters arranged in the same direction at upper and lower step positions so that the curtain receiving device allows the paint curtain to flow down or shut off and the shutter adheres to the paint adhering to the curtain receiving device. Coater equipment. (2) At least at a position where the shutter stop position is below the curtain receiving device in the paint curtain blocking position, below the curtain receiving device in the retracted position, and at a position further retracted from the curtain receiver in the retracted position when viewed from the paint curtain. The roller curtain coater device according to (1), which has three positions. It is in.

[0010]

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a diagram of a roller curtain coater apparatus according to the present invention during coating on an object 6 to be coated. The paint 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 coating material is applied by blade 2 to coating roll 1a.
The paint is scraped off from the surface of the steel sheet to form a paint curtain 7, and the paint curtain 7 is freely dropped from above the steel sheet, which is the running object 6 to be coated, to paint the steel sheet surface.

A paint receiving pan 3 having a paint receiving pan forward / backward moving mechanism 4 is provided between the blade 2 and the steel plate which is the object 6 to be coated.
A shutter 13 having a shutter forward / backward moving mechanism 14 is arranged vertically. At this time, the paint receiving pan 3 is located at the retracted position where it does not block the paint curtain 7. The shutter 13 is placed directly below the paint receiving pan 3 without blocking the paint curtain 7,
The structure is designed to receive all of the paint that has adhered to.

FIG. 2 is a view of the roller curtain coater apparatus according to the present invention during non-painting on the object 6 to be painted. At this time,
The paint receiving pan 3 is located at a position where the paint curtain 7 is blocked. All the paint curtain 7 that is flowing down is received in the paint receiving pan 3, and the paint in the paint receiving pan 3 is connected to the paint discharge port 5 from the lower part of the paint receiving pan 3 to discharge the paint. Further, the shutter 13 is arranged directly below the paint receiving pan 3 and has a structure for receiving all the drops of the paint attached to the paint receiving pan 3.

FIG. 3 is a view of the roller curtain coater apparatus according to the present invention immediately after the start of coating on an object to be coated. At this time, the paint receiving pan 3 is located at the retracted position where it does not block the paint curtain 7. Further, the shutter 13 is temporarily retracted to a position where it does not adhere to the shutter 13 even when the paint curtain 7 is disturbed when the paint receiving pan 3 blocks the paint curtain 7. Thus, the shutter 1
The paint does not adhere to the outside of 3 and the paint is prevented from falling from the shutter 13. After the paint curtain 7 becomes stable, the shutter 13 uses the shutter forward / backward movement mechanism 14 to move forward, is placed immediately below the paint receiving pan 3, and receives all the drops of the paint adhering to the paint receiving pan 3. (Figure 2).

Also, when the coating is interrupted or ended, if necessary, the shutter 13 is retracted to a position where it will not adhere to the shutter 13 even if the paint curtain 7 is temporarily disturbed, as in the case of starting the coating. Let

[0015]

According to the present invention, the paint lined outside the paint receiving pan (on the side of the paint curtain) when the paint curtain is unblocked or blocked is prevented from falling onto the object to be coated during painting. In addition to completely shutting off, it was possible to shut off completely so as not to drop onto the strip (steel plate) running underneath and stopping even during non-painting.

[Brief description of drawings]

FIG. 1 is a view of a roller curtain coater apparatus according to the present invention during coating on an object to be coated.

FIG. 2 is a view of the roller curtain coater apparatus according to the present invention during non-painting on an object to be painted.

FIG. 3 is a diagram of the roller curtain coater apparatus according to the present invention immediately after the start of coating on an object to be coated.

FIG. 4 is a diagram of a conventional roller curtain coater device.

[Explanation of symbols]

 1a coating roll 1b doctor roll 2 blade 3 paint receiving pan 4 paint receiving pan forward / backward moving mechanism 5 paint receiving pan paint discharging port 6 coated object 7 paint curtain 8 paint 13 shutter 14 shutter forward / backward moving mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Yamamoto, 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Kimitsu Steel Co., Ltd.

Claims (2)

[Claims] 1. A roller curtain coater device for forming a coating film on an object to be coated by passing a dripping paint curtain, wherein a forward / backward movement mechanism and a paint outlet are provided with a paint curtain as a boundary between the blade and the object to be coated. The curtain receiver with the shutter and the shutter with the forward / backward mechanism are arranged at the vertical step positions in the same direction, and the curtain receiver allows the paint curtain to flow down or be blocked and to receive the paint adhered to the curtain receiver with the shutter. A roller curtain coater device characterized in that 2. The stop position of the shutter is further retracted below the curtain receiving device at the blocking position of the paint curtain, below the curtain receiving device at the retracted position, and at the retracted position when viewed from the paint curtain. The roller curtain coater apparatus according to claim 1, wherein the roller curtain coater apparatus has at least three positions.