JPH07204561A - Coating device for slit nozzle - Google Patents

Abstract

PURPOSE:To provided a coating device eliminating a clearance gauge, reducing the maintenance cost, obviating a film thickness adjusting work at a coating stage by a remote control and improving working efficiency by automatically adjusting a slit width adjusting bolt operation to shorten an adjusting time and to rise a device working efficiency and providing a discharged film thickness measuring sensor at downward of the nozzle. CONSTITUTION:The slit width adjusting bolt 3 increasing and decreasing a slit opening area at an arbitrary place in a longitudinal direction of a slit nozzle main body 1 and a motor driven adjusting mechanism 20 for the bolt is provided at a side surface of the slit nozzle main body 1, and also, a pair in back and forth discharged film thickness measuring sensor 28 is provided at a downward vicinity of the slit nozzle main body 1, moreover, a controller 31 executing the remote control of a discharged flow rate from the slit nozzle is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention continuously forms a coating film on a surface of an object to be coated, such as a strip of steel, which is continuously running, by continuously flowing a coating liquid from a slit coater equipped with a slit nozzle. Slit nozzle type coating device.

[0002]

2. Description of the Related Art FIG. 3 is a side view of a conventional slit nozzle type coating apparatus, and FIG. 4 is a front and side view of the nozzle body. As shown in the figure, the strip material 11 to be coated is wound around the backup roll 9 and continuously runs. The slit nozzle body 1 is disposed above the backup roll 9 so as to face it, and the coating liquid 13 supplied through the liquid supply pipe 7 by a pump (not shown) flows out from the slit portion through the coating liquid flow path 5 and the strip 11 It is designed to form a coating film on the surface.

When adjusting the discharge flow rate of the coating liquid 13 (hereinafter referred to as the discharge film thickness), the liquid supply is stopped and the surplus liquid recovery pan 12 is mounted directly below the nozzle, and then each screw is processed to form the lock pin 6. The slit width adjusting bolt 3 (in the nozzle longitudinal direction 3A, 3B, 3 in the nozzle longitudinal direction) is composed of a bolt 4a fixed to the slit width adjusting plate 2 and a cylindrical rotary bolt 4b.
C ...) is manually rotated to the left or right to finely move the slit width adjusting plate 2 in the spreading direction or the crawling direction, and the width is measured using a clearance gauge or the like, and the slit width and the coating that have been verified in advance are applied. The film thickness is measured from the film thickness relation value. The coating film thickness dimension check at the time of running after the slit width setting is completed is performed by continuously traversing the coating film thickness dimension measurement sensor 14 arranged behind the nozzle in the width direction of the strip 11.

[0004]

The conventional coating apparatus described above has the following problems. (1) When changing the coating thickness, stop the line and manually adjust each slit width adjustment bolt (longitudinal direction 3A,
3B ... 3F) is rotated and the slit width is adjusted while measuring with a clearance gauge, so that the adjustment work requires a long time. (2) When coating is started after the film thickness is set and the film thickness setting error is found by the coating film thickness measurement sensor 14, fine adjustment of the slit width is required and the line must be stopped again for safety. In addition to the reason (1) above, the operating efficiency of the device was low. (3) As the number of slit width measurements is repeated, scratches are generated on the inner surface of the slit due to insertion of a clearance gauge, and the discharge flow from the slit part is subtly disturbed, causing defective coating. Is required and maintenance cost is required. (4) When adjusting the slit width on the coating stage, it is necessary to wear a gas mask due to evaporation of the solvent in the paint, which leads to a reduction in work efficiency.

The present invention has been proposed in order to solve such a problem. The slit width adjusting bolt operation is automatically adjusted to shorten the adjusting time, improve the operation efficiency of the apparatus, and discharge the film below the nozzle. Since the thickness gauge sensor is provided, a clearance gauge is not required, maintenance costs can be reduced, and there is no need to adjust the film thickness on the coating stage by remote control, which improves work efficiency. The purpose is to provide.

[0006]

In order to achieve the above-mentioned object, a slit nozzle coating apparatus according to the present invention is provided with a slit nozzle opposed to a strip material which is continuously wound around a backup roll and wound at an arbitrary angle. In a slit nozzle type coating apparatus for causing a coating liquid to flow from the slit-shaped opening of the slit nozzle opened in the width direction of the strip to the surface of the strip, and forming a coating film on the surface of the strip, A means for increasing / decreasing the slit opening area at any position in the slit longitudinal direction of the slit nozzle is provided, and a sensor for measuring the film thickness of the discharged film is provided near the downward direction of the slit nozzle, and the discharge flow rate control from the slit nozzle is remotely controlled. It is characterized in that means for performing is provided.

[0007]

According to the above construction, the automatic adjusting mechanism attached to the slit nozzle is moved by remote control to an arbitrary slit width adjusting bolt position in the longitudinal direction of the nozzle and connected, and the slit width adjusting bolt is rotated in the left and right directions. As a result, the width of the slit portion in the control area is expanded or reduced. Further, in response to a signal from a discharge film thickness measurement sensor provided in the vicinity of the lower side of the nozzle, the control means causes the strip material surface coating to be performed through a pre-input relational program between the discharge film thickness dimension value and the strip traveling speed. The film thickness dimension value can be calculated and transmitted to a display panel or the like on the operation panel.

[0008]

1 is a front view of a slit nozzle coating apparatus according to an embodiment of the present invention, and FIG. 2 is a view taken along the line A--A. In FIGS. 1 and 2, the same members as those in FIGS. 3 and 4 according to the conventional example are denoted by the same reference numerals, and duplicate description will be omitted.

As shown in the figure, the strip material 11 to be coated is wound around the backup roll 9 and continuously runs. And
The slit nozzle body 1 is disposed above the backup roll 9 so as to face it, and the coating liquid supplied through the liquid supply pipe 7 by a pump (not shown) flows out from the slit portion through the coating liquid flow path 5 to Forming a coating film on the surface is the same as in the conventional example.

On the side surface of the slit nozzle body 1, an electric adjusting mechanism 20 for remotely changing the coating film thickness is provided. This electric adjustment mechanism 20 is operated and operated by an operation panel (not shown), and when the moving motor 21 is started, the power thereof is transmitted from the motor gear 21a and the traveling gear 22 to the rack rail 23 so that the electric adjustment mechanism mounting base 24 is optional. The slit width adjusting bolts 3A, 3B, 3C ... 3F are configured to move to any position.

The adjusting bolt transmission gear 25 provided on the lower portion of the electric adjusting mechanism mounting base 24 is provided with one of the slit width adjusting bolts 3 when the lock power motor 26 is activated.
The gears of the rotary bolts 4b in A, 3B, 3C ... 3F are connected and locked, and are rotationally driven by the adjusting power motor 27. Further, by operating the operation panel, the pair of front and rear discharge film thickness dimension measuring sensors 28 at substantially the same timing as the electric adjustment mechanism 20,
By driving the sensor moving motor 30 on the round rail 29, it can be moved below the slit adjusting portion. The detection signal of the discharge film thickness dimension measuring sensor 28 is input to the controller 31.

Therefore, when the supply of the coating liquid is started at the predetermined slit width adjusting position and flows out from the slit portion, the controller 31 causes the discharge film thickness which is input in advance based on the signal from the discharge film thickness dimension measuring sensor 28. A dimensional value of the coating thickness of the surface of the strip is calculated by a relational expression program between the dimension measurement value and the traveling speed of the strip, and the calculated value is displayed on the display unit on the operation panel (not shown). The target setting value of the coating film thickness is controlled while monitoring the size of the display unit. When the adjusting power motor 27 is started and the adjusting bolt transmission gear 25 is rotated to the right, the slit width is adjusted by rotating the slit width adjusting bolt 3 described above. The adjusting plate 2 is pushed inward and the slit width is narrowed,
Spread by rotating left. When the slit width setting is completed, the lock power motor 26 is started to release the connection lock between the adjusting bolt transmission gear 25 and the slit width adjusting bolt 3,
Move the electric adjustment mechanism 20 to the next adjustment position ... (Repeat thereafter).

When the slit width adjustment in all of the longitudinal direction is completed, the line running is started after the surplus liquid recovery pan 12 mounted before the adjustment is loaded and unloaded, and the surface of the strip 11 is coated. The coating film thickness dimension on the surface of the running belt material 11 is further confirmed by a coating film thickness measurement sensor 14 provided on the rear side of the nozzle and continuously traversing in the width direction of the belt material 11 for measurement. . When the unevenness of the coating film thickness distribution or the setting error is confirmed in the width direction of the strip material 11, the fine adjustment is performed by the operation of the operation panel without stopping the line.

[0014]

As described above, according to the present invention, the nozzle width is adjusted by providing an automatic adjustment mechanism on the side surface of the nozzle, which can be remotely controlled, so that the following effects can be obtained. (1) The nozzle width adjustment time can be greatly shortened, and the coating film thickness can be finely adjusted by remote control without stopping the line, and the operation efficiency of the apparatus can be improved. (2) Scratches on the inner surface of the nozzle caused by the insertion of the clearance gauge and damage such as unevenness on the sharp edges are eliminated, and the maintenance cost of the inner surface polishing performed by disassembling the nozzle can be reduced. (3) The work of wearing protective gloves and a gas mask in the coating stage is eliminated, which leads to improvement of the work environment and safety.

[Brief description of drawings]

FIG. 1 is a front view of a slit nozzle coating apparatus according to an embodiment of the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a side view of a conventional slit nozzle type coating apparatus.

4A and 4B are explanatory views of the nozzle body, in which FIG. 4A is a front view and FIG. 4B is a side view.

[Explanation of symbols]

 1 Slit Nozzle Main Body 2 Slit Width Adjusting Plates 3A, 3B, 3C ... Slit Width Adjusting Bolt 5 Coating Liquid Flow Path 6 Lock Pin 9 Backup Roll 11 Band Material 14 Coating Thickness Measuring Sensor 21 Moving Motor 22 Running Gear 23 Rack Rail 24 Electric Adjustment Mechanism Mounting Base 25 Adjustment Bolt Transmission Gear 26 Lock Power Motor 27 Adjustment Power Motor 28 Discharge Thickness Measurement Sensor 31 Controller

Front page continuation (72) Keiji Tanizaki, 4-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Institute (72) Yoshiaki Takeishi 4-chome, Kitahama, Chuo-ku, Osaka-shi, Osaka No. 33 Sumitomo Metal Industries, Ltd. (72) Inventor Seishi Yamamoto 4-5-3 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd.

Claims (1)

[Claims] 1. A slit nozzle is arranged to face a strip material which is wound around a backup roll at an arbitrary angle and continuously runs,
Letting the coating liquid flow from the slit-shaped opening of the slit nozzle opened in the width direction of the strip to the surface of the strip,
In the slit nozzle type coating apparatus for forming a coating film on the surface of the strip material, a means for increasing or decreasing the slit opening area at any position in the slit longitudinal direction of the slit nozzle is provided, and a discharge film is provided near the slit nozzle downward direction. A slit nozzle coating device equipped with a thickness measurement sensor and means for remotely controlling the discharge flow rate control from the slit nozzle.