JPH029471A - Film thickness control device - Google Patents

Abstract

PURPOSE:To make the thickness of a film in a plate width direction optimal by providing a film thickness gauge which measures the thickness of a film in a plate width direction, scrapers which can be controlled individually to adjust a clearance between the scraper and an applicator roll and a computer which controls the clearance between the scrapers upon a signal from the film thickness gauge. CONSTITUTION:A computer 5 issues a command to a film thickness control section 4, and the control section 4 begins the control of scanning in a plate width direction and analyzing the film thickness by a film thickness gauge 3. The film thickness gauge 3 measures the film thickness in the plate width direction and outputs the data to the computer 5. The computer 5 calculates the profile of the film thickness in the plate width direction based on the film thickness value. Next, if the film thickness value falls within a control range by referring to the profile and a preset film thickness control range, the computer issues a command for the maintenance of a present status to a scraper control section 2. If a film thickness value measured at either one of measurement spots in the plate width direction is outside the control range, the computer 5 calculates any appropriate scraper 1 setting position for such as measurement spot so that the film thickness obtained at the spot meets the control range, then sets the scraper 1 to the setting position.

Description

[Detailed Description of the Invention] [Industrial Field of Application J] The present invention relates to a coating thickness control device, and in particular, to a device for controlling coating thickness, which controls the coating formed on the surface of a traveling plate to have a uniform thickness in the width direction of the plate. The present invention relates to a coating thickness control device.

[Conventional technology J] In recent years, with the aim of improving the surface properties of 1W4 plates, so-called warou-kake JJlWA products, electrical steel sheets with insulating coatings, and organic resin films have been developed, in which the surface of W4 plates is coated with inorganic or organic coatings. Steel plates, etc. have been developed.

In this case, the main raw material of WirM material (glaze for wax, MgO for electromagnetic steel sheet, organic resin such as polyester or epoxy for organic resin) is added to W4 material!! After shaping it into a shape, it is heated to a specified temperature and reacted.

It is common practice to make =i and form a robust l11 film on the surface of the steel material. At this time, in order to obtain good quality characteristics of the coated steel plate, the coating thickness is determined in the width direction of the plate (hereinafter referred to as the C direction) and in the running direction of the plate material (hereinafter referred to as the downward direction).
Keep both at their optimum values! ! 6. A vertical cross-sectional view of a commonly used roll-type 'fi film coating device is shown in FIG. 6. In the coating device shown in FIG. 6,
Conventionally, the coating thickness has been controlled by controlling the traveling speed of the steel plate 6, controlling the circumferential speed of the rolls 9 and IO, and controlling the gap between the rolls 9.1 and 10 (for example, JP-A-58-163467). However, this type of control only controls the film thickness in the L direction, and if variations in film thickness occur in the C direction due to roll wear, etc., it is not possible to control the film thickness to a uniform, optimal film thickness. , the steel properties will vary in the C direction.

[Problem to be Solved by the Invention 1] In order to solve the drawbacks of the prior art described above, the present invention can control the film thickness to the optimum film thickness even in the C direction. The present invention aims to provide a novel film thickness control device.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an apparatus for increasing the film thickness of a film continuously formed on the surface of a traveling plate by an applicator roll that applies a film stock solution. There is a film thickness gauge that measures the thickness of the formed film in the board width direction, and a film thickness meter that is installed above the applicator roll in the board width direction with a gap between the applicator roll and the applicator roll. multiple individually controllable scrapers;
The present invention provides a film thickness control device having a computer that calculates the control of the gap of the scraper based on a signal from a film thickness meter.

[Effect 1 The present invention will be explained using the drawings.

FIG. 1 is a block diagram when the present invention is implemented in a production line for forming a coating on the surface of a steel plate.

While traveling in the direction of the arrow, the steel plate 6 is moved by a pickup roll 9, an applicator roll 10. backup roll 1
1, after the coating solution 8 is applied from the coating solution tank 7 to the surface of the steel plate 6, the temperature is raised to a predetermined temperature using the heating device 12 to cause a reaction, thereby forming a coating. After that, the film-forming steel plate 6a
After being cooled by the cooling device 13, it is wound into a coil.

An explanatory diagram of the vicinity of the applicator roll in Figure 1 is shown in Figure 2.
As shown in the figure.

The coating solution is taken out from the coating solution tank 7 by a pick-up roll 9 and transferred to 134 via an applicator roll 10.
Applied to the m6 surface. A plurality of scrapers l capable of v+m are installed in the sheet width direction above the applicator roll 10 with a gap between them and the applicator roll lO, and this gap is individually set to v+m. The gap with lO is controlled. The scraper has a structure in which the scraper is driven up and down by an oil or air cylinder or the like, and a plurality of scrapers are installed in a line in the width direction of the plate. By adjusting the gap between the scraper tip and the applicator roll by moving the scraper up and down, the amount of coating solution applied from the applicator roll to the 14 plates can be controlled to achieve the desired film thickness on the steel plate surface. A film can be formed.

FIG. 3 shows an explanatory diagram of the film thickness meter. The film thickness meter 3 travels in the direction of the solid line arrow 11! In the board width direction (
Measure the film thickness while scanning the dotted line arrow). Control of scanning and the like of the film thickness meter 3 is performed by a film thickness meter control section 4.

The flowchart of the apparatus of the present invention is shown in FIG. This will be explained according to Figure 1g4.

When the computer receives the start command (step 111), it issues a film thickness meter operation start command to the film thickness meter control section (step 112).
), the il thickness gauge control unit receives the command and starts scanning the film thickness gauge in the board width direction and film thickness analysis (step 116), measures the film thickness in the board width direction (step 117), and sends the film to the computer. Output the thickness. The calculator uses the film thickness value sent to it.
Calculate the film thickness profile in the board width direction (Step 11
3) Next, the computer determines from the calculated profile and the preset film thickness management range in step 114.
), if all the film thickness values in the board width direction are within the control range, issue a command to maintain the current status to the scraper controller (step 118), the scraper controller maintains the current set position.

If the film thickness value measured at any location in the board width direction is outside the control range, proceed to step 115 and bring the film thickness at the location outside the control range in the board width direction into the control range. , calculates the set position of the scraper corresponding to the location, and issues a command to the scraper control (pressing part). The scraper control part controls the scraper to the set position based on the sent command.

By repeating the above flow as one cycle,
The film thickness is stably controlled within the control range in the board width direction.

[Example 1] The present invention was installed as shown in FIG. 1 on a line for producing colored steel sheets whose surfaces were coated with acrylic resin. The coating film thickness was 50 g/ba, and the control range was ±5 g/rn', and the control was performed to stay within this range.

After carrying out the present invention, the film thickness distribution in the width direction of the cut steel plate was measured using an electric thickness meter, and the results are shown in FIG. 5. As is clear from FIG. 5, in the conventional method (B),
The coating is thicker at the center of the plate than the control range (-dotted chain line), and thinner at the edge of the plate, but the film thickness distribution (A
), it can be seen that the coating film thickness in all width directions of the board is controlled within the control range.

In this example, an infrared film thickness meter was used as a film thickness meter installed on the line, and the film thickness was determined by measuring the amount of infrared light absorbed by the resin. A thickness gauge must be used.

Further, in this embodiment, the film thickness gauge was installed behind the cooling device in the traveling direction of the steel plate, but it is not limited thereto, and may be placed anywhere after the applicator roll after the amount of coating stock solution is controlled.

[Effects of the Invention] By using the apparatus of the present invention, a uniform film can be produced not only in the L direction but also in the C direction in a production line where a film stock solution is applied to the surface of a moving plate by an applicator roll to form a film continuously. It became possible to form a thick film. Therefore, the conventional problem of variations in film thickness due to changes in line speed and wear of the rolls is solved, and it has the excellent effect of stably producing steel materials with excellent surface properties.

[Brief explanation of the drawing]

Figure 1 is a block diagram when the present invention is implemented in a production line that forms a coating on the surface of a steel plate, Figure 2 is an explanatory diagram of the vicinity of the applicator roll in Figure 1, and Figure 3 is an explanatory diagram of a film thickness meter. , FIG. 4 is a flow diagram of the apparatus of the present invention, FIG. 5 is a diagram showing the relationship between the board width direction and the coating film thickness, and FIG. 6 is a longitudinal cross-sectional view of the roll-type film coating apparatus. ■...Scraper 2...Scraper control section 3
...Film thickness meter 4...Film thickness meter control section 5...
Weighing machine 6...Steel plate 6a...Wave film forming m plate 7...Coating stock solution tank 8...Coating stock solution 9...Pickup roll 10...Applicator roll 11...Backup roll

Claims (1)

[Scope of Claims] 1. A device for controlling the thickness of a coating continuously formed on the surface of a running plate by an applicator roll that applies a coating solution, the device measuring the thickness of the formed coating in the width direction of the plate. A film thickness gauge, a plurality of scrapers installed above the applicator roll in the sheet width direction with a gap between them and the applicator roll, and whose gaps with the applicator roll can be individually controlled; A coating thickness control device comprising: a computer that calculates the control of the gap of the scraper based on a signal.