JPH0779068B2 - Method for laminating ceramic green sheets - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laminating a ceramic green sheet which is useful when manufacturing an electronic component using a ceramic laminated body.

[0002]

2. Description of the Related Art An electronic component using a ceramic laminated body, for example, a laminated ceramic capacitor, uses a ceramic laminated body formed by laminating internal conductors via ceramics in a manufacturing process thereof.

The ceramic laminates described above are generally made from PET.
A step of applying a ceramic slurry in a sheet shape on the film, a step of printing a conductor pattern for internal electrodes on the surface of the green sheet on the film, and a green after printing
While peeling off the film from the sheet, the printed portion is cut out in a rectangular shape and taken out, and a predetermined number of the cut sheets are stacked on a table, and the stacked cut sheets are pressure-bonded to form a laminated sheet. It is manufactured from a step of obtaining and a step of cutting the laminated sheet after pressure bonding into a predetermined shape. The unfired ceramic laminated body obtained after cutting is then fired, and conductive paste for external electrodes is attached and formed on each end to form a laminated ceramic capacitor. Depending on the type, there is also one in which conductive paste is adhered and formed on both ends of an unfired ceramic laminate and then fired.

By the way, a laminating apparatus as shown in FIG. 4 is used in the above step of stacking a predetermined number of cut sheets cut out from the green sheet after printing.

This laminating apparatus comprises a main roller 1 wound around a printed green sheet Si (hereinafter, simply referred to as a printing sheet Si) having a film F, and a film F.
A winding roller 2 for winding the film, a peeling roller 3 for peeling the film F from the printing sheet Si, and a suction belt having a large number of suction holes and driven to rotate intermittently in a predetermined direction. Four
A suction table 5 having a large number of suction holes arranged on the upper and lower surfaces of the suction belt 4, a container 6 for accommodating the punched sheet Su, and a printed portion cut into a rectangular shape, and It is composed of a cutter 7 to be conveyed and a stacking stand 8 on which the cut sheets Sk are stacked. The cutter 7 is a cutter body 7 having a rectangular bottom surface with a large number of suction holes.
a, a cutter blade 7b that is vertically movable around the cutter main body 7a, and a heater 7c built in the cutter main body 7a. It is possible to move vertically and vertically.
The stacking table 8 has a heater 8a built-in, and can be moved in the vertical direction by a drive mechanism (not shown).

The laminating apparatus described above performs the following laminating operations. First, the peeling roller 3 and the suction belt 4 are operated to peel off the film F from the printing sheet Si and wind it by the winding roller 2, while sending only the printing sheet Si onto the suction belt 4. . Then, the cutter 7 is lowered toward the print sheet Si stopped on the suction belt 4 to cut the print portion into a rectangular shape, and the cut sheet Sk is cut.
Is adsorbed and held on the bottom surface of the cutter body 7a and transferred to the stacking table 27 (see the chain double-dashed line), where the stacking table 8 is raised to move the cut sheet Sk to the upper surface thereof. The cut sheet Sk after cutting out is the heat of the cutter body 7a.
The sheet 7c is softened by heating, and the cut sheet Sk placed on the upper surface of the stacking stand 8 is also softened by heating by the heater 8a. Stacked with their surfaces closely attached. By repeating this a predetermined number of times, a predetermined number of cut sheets Sk are stacked on the stacking table 8.

[0007]

By the way, in the conventional laminating method, the cut sheets Sk and the laminated base 8 are cut out so that the cut sheets Sk can be stacked with high accuracy and can be taken out easily after the lamination. Each of the upper cut sheets Sk is heated to be softened to improve mutual adhesion, and then pressure is applied to temporarily fix the sheets to each other.

That is, since the cut sheet Sk is entirely heated from the start to the end of stacking, the stacked cut sheet Sk and the conductor pattern undergo thermal contraction, and both are smaller than the set size. There is a drawback. If the heating temperature is lowered and the pressure during stacking is increased in order to suppress this heat shrinkage, the cut sheet Sk and the conductor pattern conversely expand and spread.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent deformation of the cut sheet and the conductor pattern and to perform proper stacking of the ceramic green sheet. To provide a method of laminating.

[0010]

In order to achieve the above object, in the present invention, the printed portion is formed in a predetermined shape while peeling the film from the printed green sheet on which the conductor pattern is printed. A ceramic green sheet that is cut and taken out, and a predetermined number of cut sheets are stacked on a table.
In the method of stacking sheets, the unprinted portion is left at the peripheral edge of the cut sheet when the green sheet after printing is cut, and the cut sheet is stacked when the cut sheet is stacked on the table. The peripheral portions of the are fixed to each other.

[0011]

In the laminating method of the present invention, when the cut sheets are stacked on the table, the peripheral portions of the cut sheets, that is, the unprinted portions of the conductor patterns are fixed to each other. The stacked cut sheets and conductor patterns are not deformed.

[0012]

1 to 3 show an embodiment of the present invention. FIG. 1 is a schematic view of a laminating apparatus, FIG. 2 is a top view of a cut sheet, and FIG. 3 is a cut sheet after heat ray irradiation. FIG. In this embodiment, the same reference numerals are used for the parts having the same configurations as those of the conventional example shown in FIG.

In the figure, 1 is a main roller around which the printing sheet Si is wound, 2 is a winding roller around which the film F is wound, and 3 is peeling for peeling off the film F from the printing sheet Si. Roller 4 has a large number of suction holes and is intermittently driven to rotate in a predetermined direction. Reference numeral 6 denotes a container for accommodating the punched sheet Su after cutting.

Reference numeral 9 denotes a cutter which cuts a printed portion into a rectangular shape and conveys it. The cutter main body 9a has a rectangular bottom surface provided with a large number of suction holes, and is vertically movable around the cutter main body 9a. It is composed of a cutter blade 9b arranged in the. The cutter 9 can be moved horizontally and vertically by a drive mechanism (not shown).

Reference numeral 10 denotes a stacking base on which the cut sheets Sk are stacked, which can be moved in the vertical direction by a drive mechanism (not shown).

Reference numeral 11 denotes a heater for wearing a cut sheet, which comprises a total of eight irradiation fibers 1 capable of radiating heat rays such as far infrared rays.
1a is provided downward along a peripheral edge Sk1 of a cut sheet Sk described later. The heater 11 can be moved in the horizontal direction by a drive mechanism (not shown), and a light source for generating far infrared rays is connected to each irradiation fiber 11a.

The laminating operation by the laminating apparatus will be described below.

First, the peeling roller 3 and the suction belt 4 are operated to peel off the film F from the printing sheet Si and wind it by the winding roller 2, while only the printing sheet Si is sucking belt 4. Send it on.

Next, the cutter 9 is lowered toward the printing sheet Si stopped on the suction belt 4, and when the bottom surface of the cutter body 9a comes into contact, the cutter blade 9b is moved to the meat of the printing sheet Si. Lower the conductor pattern by a distance corresponding to the thickness
Cut the printed part of the screen into a rectangular shape. As shown in FIG. 2, the cutting is performed so that the peripheral portion Sk1 of the cut sheet Sk has a portion on which the conductor pattern is not printed.

Further, except when the first sheet is cut by the cutter 9, the heater 1 is used for the above-mentioned cutting.
1 is moved to the upper side of the laminating table 8, and the laminating table 8 is moved upward so that the cut sheet Sk on the table is irradiated with the irradiation fiber 11.
Far infrared rays are radiated from each irradiation fiber 11a toward the peripheral edge portion Sk1 of the cut sheet Sk in the vicinity of a. In this irradiation, as shown in FIG. 3, the peripheral portion Sk1 is partially heated to a temperature of about 180 to 200 ° C., and eight softening portions P having a width of several mm are formed in a portion corresponding to each irradiation fiber 11a. It

Next, while the heater 11 is avoided from the stacking table 10, the cut sheet Sk is transferred onto the stacking table 27 while being held by suction on the bottom surface of the cutter body 9a, and the stacking table 10 is raised again here. Then, the cut sheet Sk on the table is pressed against the cut sheet Sk on the cutter 9 side. By this pressure contact, the softened portion P becomes an adhesive portion and the cutter 9
The cut sheet Sk on the side is the cut sheet Sk on the side of the stacking table 1
Fasten to. After that, if the stacking table 10 is lowered, the cut sheet Sk on the cutter 9 side can be taken out from the cutter 9 and stacked on the table.

By repeating the above procedure a predetermined number of times, a predetermined number of cut sheets Sk can be stacked on the stacking table 8.

As described above, according to the above-mentioned stacking method, when the cut sheets Sk are stacked on the stacking table 10, the far-infrared rays are irradiated from the irradiation fiber 11a to the peripheral edge Sk1 where the conductor pattern is not printed. Since several softening points P are formed by using the above-mentioned softening points P as an adhesive portion to fix the sheets to each other, the stacked cut sheets Sk are stacked.
Also, the sheets can be properly stacked without causing deformation of the conductor pattern.

In the above embodiment, the heater 11 provided with the heat ray irradiating fiber is used as a means for fixing the peripheral portion Sk1 of the cut sheet Sk, but various fixing means other than the irradiating fiber are adopted. Yes, and some of the specific examples below.

In FIG. 5, a cut sheet S is used as a fastening means.
Shown is an applicator 12 for applying adhesive to the periphery of k. The attaching device 12 has a total of 12 attaching pins 12a facing downward along the peripheral edge of the cut sheet Sk, and can be moved in the horizontal direction and the vertical direction by a drive mechanism (not shown). Adhesive tank 12b arranged horizontally
Cut the adhesive attached to the attachment pin 12a with S
It can be attached to the peripheral edge of k. That is, the cut sheets Sk are fixed to each other by the adhesive agent attached to the peripheral portion thereof. If the adhesive pins are formed in a nozzle shape and the adhesive can be supplied to each of the adhesive pins from the adhesive tank attached to the adhesive device side, the adhesive can be adhered only by the vertical movement. .

In FIG. 6, a cut sheet S is used as a fastening means.
Protrusions 13 are shown that increase the pressure at the periphery of k. The protrusion 13 is formed on the upper surface of the stacking base 10 by a cut sheet S.
It is formed upward along the peripheral edge of k. That is,
The cut sheets Sk are partially deformed by receiving high pressure on the protrusions 13 at the time of stacking, and are fixed to each other by the deformation.

In FIG. 7, a cut sheet S is used as a fastening means.
The support needle 14 is shown penetrating the peripheral edge of k. The support needles 14 are arranged on the upper surface of the stacking table 10 so as to be vertically movable in correspondence with the four corners of the peripheral edge of the cut sheet Sk, and cut sheets that are stacked while being pushed downward by the pressure during stacking. It can penetrate through Sk. That is, the cut sheets Sk are fixed to each other by the support needles 14 inserted in the peripheral portion thereof.

In FIG. 8, a cut sheet S is used as a fastening means.
A holding claw 15 for holding the peripheral portion of k is shown. The holding claws 15 are provided on the peripheral edge of the upper surface of the stacking table 10 in an upward direction corresponding to the four corners of the peripheral edge of the cut sheet Sk, and are held outwardly in synchronization with the conveyance of the cut sheet Sk. After stacking, the upper sheet can be held and the downward pressing force can be applied. That is, the cut sheet S
The peripheral edges of k are pressed by the holding claws 15 and fixed to each other.

In the above embodiment, the present invention is applied to the manufacturing process of a monolithic ceramic capacitor, but other electronic parts such as a monolithic inductor element and a piezoelectric actuator which are formed by using the same ceramic laminate. The present invention can be applied to the manufacture of

[0030]

As described in detail above, according to the present invention,
When the cut sheets are stacked on the table, the peripheral portions of the cut sheets on which the conductor patterns are not printed are fixed to each other, so that the cut sheets and the conductor patterns are stacked. It is possible to properly stack the sheets without causing any trouble.

[Brief description of drawings]

FIG. 1 is a schematic view of a laminating apparatus according to the present invention.

FIG. 2 is a top view of the cut sheet.

FIG. 3 is a top view of the cut sheet after the heat ray irradiation.

FIG. 4 is a schematic view of a conventional laminating apparatus.

FIG. 5 is a diagram showing another example of fastening means.

FIG. 6 is a view showing another example of fastening means.

FIG. 7 is a diagram showing another example of fastening means.

FIG. 8 is a view showing another example of fastening means.

[Explanation of symbols]

Si ... Printing sheet, F ... Film, Sk ... Cut sheet
Tok, Sk1 ... peripheral part, 9 ... cutter, 10 ... stacking stand, 1
1 ... Heater, 12 ... Adhesive device, 13 ... Protrusion, 14 ... Support needle, 15 ... Holding claw.

Claims (1)

[Claims] 1. A printed grease printed with a conductor pattern.
In the method of laminating the ceramic green sheet, the printed portion is cut out in a predetermined shape and taken out while peeling the film from the sheet, and a predetermined number of cut sheets are stacked on the table. -When the sheet is cut, an unprinted portion is left on the peripheral portion of the cut sheet, and when the sheet is stacked on the table, the peripheral portions of the cut sheet are fixed to each other. A method for laminating ceramic green sheets, characterized in that