JPH06290986A - Apparatus and method for manufacturing green sheet - Google Patents

Abstract

PURPOSE:To increase the utilization efficiency of a green sheet and a carrier sheet in the manufacture of the green sheet using the film-forming apparatus of the doctor blade method. CONSTITUTION:In a unitized construction of a blade coater 12a with a base and a sidewall, this apparatus manufactures a green sheet by permitting a carrier sheet 13 to pass inside it to form a slurry 15 into a film in a gap with a blade 11. This enables the material utilization efficiency to improve and a flat and uniform green sheet 14 free from projections and recesses to be obtained over the whole width of the carrier sheet 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a green sheet by a doctor blade method, and more particularly to a structure in which a frame base of a blade coater unit is integrated and a method for manufacturing a green sheet using the carrier sheet effectively. .

[0002]

2. Description of the Related Art A conventional film coater using a blade coater is used for manufacturing a green sheet. Figure 3
4 is a schematic view of the equipment for blade coater film formation, FIG. 4 is a perspective view of the periphery of the blade coater portion, and FIG. 5 is a cross-sectional view taken along the line BB of FIG. Referring to these drawings,
Is mounted by a blade so that the groove portions formed on the inner surfaces of the both side plates 2a, 2b can be vertically moved and adjusted. These are attached to the base 7, and when the carrier sheet 3 is sent out, the ceramic powder, the organic solvent, the plasticizer and the binder are kneaded by the side plates 2 and the blade 1 which form the blade coater part. Produce a sheet. At this time, the sludge 5 is poured, the position of the blade is moved up and down to determine the position, and the carrier sheet 3 is pulled out in the traveling direction, whereby the green sheet 4 is placed on the carrier sheet 3.
Can be obtained.

[0003]

By the way, the film forming apparatus using the doctor blade method has a structure in which the blade portion is sandwiched from both sides, and since the blade coater portion is installed on the carrier sheet 3, the entire surface of the carrier sheet is However, there is a drawback that the green sheet 4 cannot be coated and a margin is required, resulting in poor utilization efficiency of the carrier sheet.

Further, since the blade coater portion is installed on the carrier sheet 3, there is a drawback that the surface of the carrier sheet 3 is damaged. In addition, since the blade coater portion arranged on the substrate 7 is installed with the carrier sheet 3 interposed, the friction resistance between the carrier sheet 3 and the base 7 becomes large, and the friction and deformation are increased depending on the frequency of use. However, the green sheet 4 having a predetermined thickness cannot be obtained easily, and the green sheet 4 having irregularities is formed, which causes a portion in which a desired film thickness cannot be obtained.

Further, since the green sheet 4 is not formed on the entire surface of the carrier sheet 3, there is a difference due to the thermal influence of the carrier sheet 3 between the portion with the green sheet and the portion without the green sheet during the drying process of the green sheet 4. Therefore, there is a drawback that the carrier sheet 3 is thermally deformed. Therefore, it is desired to improve a film forming apparatus that eliminates these defects and a green sheet manufacturing method using the film forming apparatus.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention has been proposed to solve the above-mentioned problems, in which a substrate and a side wall are integrally provided with a mud replenishing section, and the width is the same as that of a carrier sheet. Disclosed is a manufacturing apparatus and a manufacturing method of a green sheet for forming a film.

According to the present invention, there is provided a green sheet manufacturing apparatus in which a doctor blade unit is attached to a blade coater unit in which a base and a side wall are integrally formed, and a tank unit for supplying mud is provided.

Then, a method for producing a green sheet is presented, in which a film of mud is formed on the entire upper surface of the carrier sheet.

[0009]

In the structure of the film forming apparatus described above, the entire width of the carrier sheet corresponds to the lower side of the blade portion, and the green sheet made of mud is formed on the entire width surface.

Further, a blade coater portion composed of a base and a side wall plate is integrally formed. In the structure of the blade coater, the weight on the base is only the weight of the mud, the frictional resistance as in the conventional structure is reduced, the base plate is not worn or deformed, and there is no unevenness in the uniform green. A sheet can be formed.

Further, since the green sheet is formed on the entire surface of the carrier sheet, the thermal influence of the dry magnetic of the green sheet on the carrier sheet becomes uniform, and thermal deformation at both ends of the carrier sheet can be eliminated.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a film forming apparatus for forming a green sheet for a monolithic ceramic capacitor by a doctor blade method, which is an embodiment showing a situation in which a carrier sheet is coated with mud.

In the figure, the film forming apparatus includes a blade coater portion 12a having a side wall integrally formed with a blade portion 11 as a base.
It is composed of There is mud 15 inside this integrated frame
Is supplied, and the green sheet 14 is coated on the carrier sheet 13 passing through the inside of the bottom surface thereof. At this time, since the base plate of the blade coater unit 12 only bears the weight of the replenished mud 15, the carrier sheet 13 is not damaged in any way, and the wear of the base plate thereabove is significantly suppressed. It Therefore, it is possible to obtain a uniform mud film without unevenness.

For example, when a carrier sheet having a width of 300 mm is formed by a conventional film forming apparatus by a conventional method,
The green sheet 14 could be formed only in a width of about 280 mm out of the total width of 300 mm. Further, the end portion 5 mm on one side of the green sheet cannot be used practically because it is considered to have unevenness, and a good product as a green sheet has a width of about 270 mm. According to the present invention, this is the carrier sheet 13 having a width of 270 mm from the beginning.
By using, it is possible to coat the entire surface, and the entire width can be utilized as a non-defective film, so that the utilization efficiency of the carrier sheet as well as the utilization efficiency of the green sheet as mud can be improved.

[0016]

As described above, according to the present invention, since the bottom base of the blade coater and the side wall plate are integrally formed, the entire surface of the carrier sheet can be coated with a green sheet. In addition, scratches on the carrier sheet during film formation and less wear of the base plate are alleviated, whereby a flat and uniform green sheet with no irregularities can be obtained.

Further, it has great industrial value such that the utilization efficiency of the carrier sheet and the utilization efficiency of the green sheet can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a film forming apparatus according to the present invention and a periphery of a green sheet formed by the film forming apparatus.

2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic view of equipment for a film forming method using a blade coater unit.

FIG. 4 is a peripheral perspective view of a conventional blade coater portion.

5 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 11 Blade Section 12 Blade Coater Section 13 Carrier Sheet 14 Green Sheet 15 Mud 16 Direction of Carrier Sheet

Claims (3)

[Claims] 1. A green sheet manufacturing apparatus in which a doctor blade section is mounted on a blade coater section in which a base and a side wall are integrally molded, and a carrier sheet which moves to the base surface side by the supply of mud is arranged. 2. The green sheet manufacturing apparatus according to claim 1, wherein the carrier sheet of the blade coater has a green sheet of mud on its entire surface. 3. A method for producing a green sheet, which comprises forming a film of sludge in the same width as a carrier sheet.