JPH05269715A - Molding device of green sheet - Google Patents

Abstract

PURPOSE:To provide a molding device of a green sheet which can mold efficiently the green sheet superior in precision. CONSTITUTION:A doctor blade 2 is provided substantially the central part of a base rest 1 perpendicularly to the longitudinal direction. On the other hand, a smooth sheet molding stage 4 moving on the base rest 1 toward a green sheet molding side from a raw material supply side while being guided by a rod 3 provided in the longitudinal direction of the base rest 1 is provided on the lower side of the doctor blade 2. Then the title device is constituted so that the sheet molding stage 4 to which raw material slurry is supplied is moved by passing underneath the doctor blade 2, through which a green sheet which has a fixed thickness and is superior in smoothness is molded. Then on the contrary, the sheet molding stage 4 is fixed and the doctor blade 2 is provided movably on the upper part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a green sheet forming apparatus capable of efficiently forming a highly accurate green sheet.

[0002]

2. Description of the Related Art For example, a green sheet forming apparatus used for forming a ceramic substrate or the like is provided with a ceramic raw material slurry which is supplied onto a carrier film such as polyethylene terephthalate resin and which is passed under a doctor blade to obtain a constant amount. A so-called doctor blade coater is commonly known in which a thick green sheet is formed and the carrier film and the green sheet are sequentially wound.

However, in the conventional green sheet molding apparatus, since tension is applied to the carrier film, it is difficult for the film to undulate and it is difficult to maintain a smooth surface, so that undulation occurs in the molded green sheet. There is a problem in that it is not possible to obtain a highly accurate product because the sheet is made uneven or the thickness of the sheet becomes uneven. Furthermore, the apparatus itself is complicated and large, and the mold changing work and maintenance work are complicated, and the installation space is large.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, does not cause the waviness of the sheet, and can control the thickness of the sheet to a constant level, which is excellent in accuracy. Completed with the objective of providing a green sheet forming device that can form green sheets efficiently, is structurally simple and compact, and can easily perform mold changing work and maintenance work. It is a thing.

[0005]

DISCLOSURE OF THE INVENTION The present invention made to solve the above-mentioned problems is to provide a doctor blade at a substantially central portion of the base at right angles to the longitudinal direction, and to provide a base below the doctor blade. A green sheet forming apparatus is provided with a smooth sheet forming stage which is guided by a rod provided in a longitudinal direction of the sheet and moves on a base from a raw material supply side toward a green sheet forming side. According to the present invention, a sheet forming stage having a smooth surface is provided on a base, and a doctor blade that moves while forming a green sheet with a constant thickness of the supplied raw material is provided above the sheet forming stage. A green sheet forming apparatus characterized by the above is a second invention.

[0006]

The present invention will now be described in detail with reference to the illustrated embodiments. The drawing shows an apparatus for forming a green sheet for a ceramic substrate, in which 1 is a base and 2 is a doctor blade provided at a substantially central portion of the base 1 at right angles to the longitudinal direction. Yes, the base 1 has 2
The parallel rods 3 and 3 of the book are provided along the longitudinal direction, and the rod 3 is provided with a sheet forming stage 4 which is freely movable on the rods via a bracket 4a.

The sheet forming stage 4 is made of, for example, a stainless steel plate or a polished glass plate having excellent hardness and smooth surface. A smooth green sheet forming area 5 is formed on the upper surface side of the sheet forming stage 4 and is located on the right side in FIG. 1 from the raw material supply side A for supplying the raw material slurry 10 to the left side. It is configured to move through the lower side of the doctor blade 2 while maintaining a predetermined distance toward the green sheet forming side B located at.

A carrier film such as polyethylene terephthalate resin may be laid in the molding area 5 so that the product on the green sheet molding side B can be easily taken out. In this case, unlike the conventional case. No tension is applied to the film, so smoothness is not impaired.

Further, in the embodiment, the entire upper surface side of the sheet forming stage 4 is used as a forming area 5 for forming a green sheet, and the obtained green sheet is cut into a predetermined shape in a subsequent step, if necessary. However, it is also possible to form the molding area 5 in the shape of a groove corresponding to the predetermined shape of the green sheet to be molded. Further, as shown in FIG. 4, a sheet forming smooth plate 6 having a smooth surface such as a glass plate may be detachably mounted in the concave groove-shaped forming area 5. In this case, The molded green sheet is taken out together with the sheet-forming smoothing plate 6 and dried at another place (necessary for about 20 to 30 minutes), while a new sheet-forming smoothing plate 6 is formed in the forming area 5. By mounting and forming the next green sheet, the forming can be performed extremely efficiently.

[0010]

The thus constructed green sheet 1 having a constant thickness is obtained by passing the supplied ceramic raw material slurry 10 under the doctor blade 2.
2 is similar to the conventional apparatus of this type, but in the present invention, as shown in FIG. 3, the raw material slurry 10 is supplied to the sheet forming stage 4 having a highly accurate smooth surface. In addition, the green sheet 12 is formed by moving the sheet forming stage 4 from the raw material supply side A toward the green sheet forming side B under the doctor blade 2 with a predetermined gap therebetween. Both surfaces of No. 12 are extremely smooth without undulations, and their thickness is controlled to be constant, so that a product with excellent dimensional accuracy can be obtained.

The relationship between the doctor blade 2 and the sheet forming stage 4 may be such that one of them moves relatively, and contrary to the above, the base 1
A sheet forming stage 4 having a smooth surface is provided on the upper portion, and a doctor blade 2 that moves while forming a green sheet with a constant thickness of the supplied raw material is provided on the upper portion of the sheet forming stage 4. Can also

(Example 1) A carrier film made of polyethylene terephthalate resin is laid in the molding area of a sheet molding stage made of a glass plate, and a raw material slurry having a viscosity of 15,000 cps is supplied from the raw material supply side for sheet forming. Move the stage at a speed of 0.3 m / min to achieve zero thickness.
A 75 mm alumina green sheet was molded. As a result of measuring the smoothness of the obtained sheet, the maximum amplitude from the reference value is
15 micron or less, average waviness 10 micron, and the maximum amplitude obtained by a conventional doctor blade coater is 30 micron or less, average waviness
It was confirmed that it has excellent smoothness as compared with 20 μm.

[0013]

As is apparent from the above description, the present invention efficiently forms a green sheet of excellent precision without causing waviness of the sheet and controlling the thickness to be constant. In addition to being structurally simple and small, it is possible to easily perform mold changing work and maintenance work. Therefore, the present invention, as a green sheet forming apparatus that eliminates the conventional problems, greatly contributes to industrial development.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view showing a main part in FIG.

FIG. 4 is a vertical cross-sectional view showing another embodiment.

[Explanation of symbols]

 1 base 2 doctor blade 3 rod 4 sheet forming stage 5 forming area 6 sheet forming smooth plate

Claims (3)

[Claims] 1. A doctor blade (2) is provided substantially at the center of the base (1) at a right angle to the longitudinal direction, and a doctor blade (2) is provided below the doctor blade (2) in the longitudinal direction of the base (1). rod
A smooth sheet forming stage that is guided by (3) and moves on the base from the raw material supply side toward the green sheet forming side.
(4) A green sheet forming apparatus characterized by being provided. 2. A sheet forming stage (4) having a smooth surface is provided on a base (1), and the sheet forming stage is also provided.
An apparatus for forming a green sheet, characterized in that a doctor blade (2), which moves while forming the green sheet with a constant thickness of the supplied raw material, is provided above the (4). 3. A recessed groove-shaped forming area (5) is provided on the upper surface of the sheet forming stage (4), and the forming area (5) is formed.
The green sheet forming apparatus according to claim 1 or 2, wherein a sheet forming smooth plate (6) is detachably mounted therein.