JPH02106809A - Ceramics substrate green sheet molding device - Google Patents

Abstract

PURPOSE:To execute adjustment of the thickness of a slurry to be applied automatically with a little time lag by providing a slurry thickness meter by which the thickness of the slurry immediately after being applied is measured, and a controller by which the space of a doctor blade is automatically set. CONSTITUTION:A slurry thickness meter 4 is formed just behind a doctor blade 2 to measure the thickness of a slurry before it is put into a hot air drying oven 5, and a controller 8 is provided by which the space of the doctor blade 2 is automatically adjusted. A coefficient of contraction K is determined from the thickness A0 of the slurry measured by the slurry thickness meter 4 and from the thickness B0 of a green sheet measured after passing through the hot drying oven 5 by a green sheet thickness meter 6. The space D1 of the doctor blade in adjustment condition is calculated from a product standard value G of the thickness of the green sheet, the space D0 of the initial doctor blade 2, and the thickness A0 of the slurry, and from the coefficient of contraction K, so as to automatically adjust the space of the doctor blade 2 based on the value by the controller 8. The green sheet 9 of the thickness of product standard can thus be produced without the generation of time lag.

Description

[Detailed Description of the Invention] [Summary] Regarding the improvement of a ceramic substrate green sheet forming device and the method of controlling the thickness of slurry in the green sheet forming process, it is possible to obtain a green sheet with a thickness that accurately meets product specifications. With the aim of providing a ceramic substrate green sea 1 molding device and slurry film thickness control method that can reduce product loss in the manufacturing process, the slurry in the liquid tank is transferred onto a carrier film using a doctor blade. The carrier film coated with the slurry is passed through a hot air drying oven to form a green sheet, and the thickness of the green sheet measured by a green sheet thickness meter is fed back to the doctor blade to dry the slurry. A ceramic substrate green sheet forming apparatus that winds up the green sheet with a winding drum while correcting the application thickness setting, the device comprising: a slurry thickness gauge that measures the thickness of the slurry immediately after application; and a doctor blade. and a controller that automatically sets the interval between the slurry and the green sheet, and the thickness of the slurry measured by the slurry thickness meter immediately after application using the ceramic substrate green sheet forming apparatus, and the thickness of the green sheet;
The controller is configured to adjust the gap between the doctor blades using the product standard thickness of the green sheet.

[Industrial application field]

The present invention relates to the production of ceramic green sheets, and particularly to improvements in a ceramic substrate green sheet forming apparatus and a method for controlling the thickness of slurry in a green sheet forming process.

In ceramic substrate green sheet forming equipment, in order to form a green sheet with a thickness that meets product standards, the thickness of the green sheet after drying in a hot air drying oven is measured using a green sheet thickness meter, and the green sheet is The thickness of the slurry is fed back to the doctor blade, and the spacing between the doctor blades is adjusted to set the slurry thickness.

However, because the position of the green sheet thickness gauge and the position of the doctor blade are far apart, a time lag occurs in feedback for adjusting the thickness of the green sheet.

Due to the situation described above, there is a need for a ceramic substrate green sheet forming apparatus and a slurry film thickness control method that can form green sheets with a thickness that meets product standards without any time lag. There is.

[Prior Art] A conventional ceramic substrate green sheet forming apparatus and slurry film thickness control method will be explained with reference to FIG.

FIG. 3 is a diagram showing a schematic structure of a conventional ceramic substrate green sheet forming apparatus.

In the figure, the slurry 1a in the liquid tank 1 is uniformly applied to the surface of the carrier film 3 according to the spacing between the doctor blades 2, and is dried into a green sheet 9 while passing through a hot air drying oven 5. It is wound up by the winding drum 7.

In this case, the thickness of the green sheet 9 can be adjusted by measuring the thickness of the green sheet 9 after passing through the hot air drying oven 5 with a green sheet thickness gauge 6, and using that value and the product standard value for the thickness of the green sheet. This is done by the operator manually changing the setting of the spacing between the doctor blades 2.

The position of the thickness gauge is about 15 meters away from the hot air drying oven, and the distance between the doctor blades is manually adjusted based on the measured value of the green sheet thickness gauge, resulting in a time lag in feedback. There was a problem in that it was difficult to obtain green sheets that met the product specifications, and there was also a problem in that the green sheets within this 15 m distance became defective until the spacing between the doctor blades was adjusted.

The present invention provides a ceramic substrate green sheet forming apparatus and a slurry forming apparatus capable of obtaining a green sheet having a thickness that accurately meets product specifications and reducing product loss in the manufacturing process. The purpose is to provide a film thickness control method.

[Problem to be solved by the invention]

In the conventional ceramic substrate green sheet forming apparatus described above, the green sheet measures the position where slurry is applied and the thickness of the green sheet. As shown in FIG. 1, the slurry in the liquid tank 1 is applied onto the carrier film 3 using the doctor blade 2, and the carrier film 3 coated with this slurry is passed through the hot air drying oven 5 to make it green. A sheet 9 is formed, and the thickness of the green sheet 9 measured by the green sheet thickness meter 6 is fed back to the doctor blade 2 to correct the setting of the slurry application thickness, while the green sheet 9 is rolled by the winding drum 7. The present invention is a ceramic substrate green sheet forming apparatus for winding up a green sheet, and is configured to include a slurry thickness gauge 4 for measuring the thickness of slurry immediately after coating, and a controller 8 for automatically setting the spacing between doctor blades. The slurry film thickness control method uses this ceramic substrate green sheet forming apparatus, and the slurry thickness is 80 and the green sheet thickness is B, which are measured using a slurry thickness meter immediately after coating. The gap D+ between the doctor blades is adjusted using the controller 8 and the product standard thickness G of this green sheet.

[Effect]

That is, in the present invention, as shown in FIG. 2, the initial spacing of the doctor blades. The initial thickness of the slurry applied to the carrier film was measured using a slurry thickness gauge before entering the hot air drying oven, and this value was A. and the initial slurry thickness A. and early green sea 1 ~ thickness B. It becomes possible to manufacture a green sheet having the thickness of the product standard value by adjusting the spacing of the doctor blades using the controller based on the shrinkage rate of the slurry obtained from and the product standard value G of the thickness of the green sheet. .

That is, the thickness of the slurry in the initial state is 8. , the thickness of the slurry in the adjusted state is B, and the thickness of the green sheet in the initial state is B.

, If the product standard thickness of the green sheet is G, then Ao G-(Ao Bo) (G Bo) Both sides are 8. Dividing by , we get .

This value can be determined from the measured values of the green sheet thickness meter and the green sheet thickness meter, so if this value is K, and the spacing of the doctor blade is properly adjusted and the slurry thickness is At, then BO-
G, so in that case, 1--to-8.

Increased spacing between doctor blades. If the thickness of the slurry is 8. , if the thickness of the slurry is A when the spacing between the doctor blades is Dl, then D+ At Do is 80, and substituting equation (1) here, it becomes 8. (1 K) That is, the distance between the doctor blades in the adjusted state is the distance between the doctor blades in the initial state. , the product standard thickness G of the green sheet, and the initial slurry thickness A
. Since it can be calculated from equation (2) from the shrinkage rate and the shrinkage rate, by automatically setting the doctor blade spacing to Dl using the controller, it is possible to manufacture green sheets with standard values without causing a time lag. becomes possible.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a diagram showing a schematic structure of a ceramic substrate green sheet forming apparatus according to an embodiment of the present invention.

As shown in the figure, in this embodiment, a slurry thickness meter 4 is provided immediately after the doctor blade 2 to measure the thickness of the slurry before entering the hot air drying oven 5, and the spacing between the doctor blades 2 is automatically adjusted. It has the same structure as a conventional ceramic substrate green sheet forming apparatus, except that it is equipped with a controller 8 for adjusting the temperature.

In this embodiment, the thickness of the green sheet 9 is adjusted based on the thickness of the slurry (80) measured with the slurry thickness meter 4 before entering the hot air drying oven 5, and the thickness of this slurry and the thickness of the slurry The shrinkage rate (
K), the product standard value of the thickness of the green sheet (G),
By automatically adjusting the spacing of the doctor blades 2 using the controller 9 so that the spacing of the doctor blades 2 in the adjusted state (Dl) is calculated from the initial spacing (Do) of the doctor blades 2. , it becomes possible to manufacture Green Sea 1-9 having the thickness of the product standard without causing a time lag.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, by providing a slurry thickness gauge and a controller, the thickness of the slurry applied by the doctor blade can be automatically adjusted by the controller with less time lag. It becomes possible to provide a ceramic substrate green sheet molding apparatus that can produce green sheets.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a schematic structure of a ceramic substrate green sheet forming apparatus according to an embodiment of the present invention, Fig. 2 is a diagram showing the principle of the present invention, and Fig. 3 is a diagram showing a schematic structure of a conventional ceramic substrate green sheet forming apparatus. The figure shown is, . In the figure, 1 is the liquid tank, 1a is the slurry, 2 is the doctor blade, 3 is the carrier film, 4 is the slurry scratch, 5 is the hot air drying oven, 6 is the green sea 1 - thickness gauge, 7 is the winder Tram, shows. 8 is the controller, 9 is Green Sea 1~,

Claims (1)

[Claims] [1] Applying the slurry (1a) in the liquid tank (1) onto the carrier film (3) using a doctor blade (2),
The carrier film coated with the slurry (1a) (
3) through the drying oven (5) to dry the green sheet (9).
), and the thickness of the green sheet (9) measured by the green sheet thickness meter (6) is fed back to the doctor blade (2) while correcting the setting of the coating thickness of the slurry (1a). , winding drum (7
) is a ceramic substrate green sheet forming device that winds up the green sheet (9) with a slurry thickness meter (4) for measuring the thickness of the slurry (1a) immediately after application, and a doctor blade (2). a controller (8) for automatically setting intervals; and a controller (8) that automatically sets the interval, and the thickness of the slurry (1a) measured by the slurry thickness meter (4) immediately after application, the thickness of the green sheet (9), and the green sheet. A ceramic substrate green sheet forming apparatus characterized in that the gap between the doctor blades (2) is adjusted by the controller (8) using the product standard thickness of the sheet (9).