JP2003251621A - Method for cutting of ceramic green sheet laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for cutting a ceramic green sheet laminate of a high productivity since it is free from occurrence of a flash and a distortion of a shape to be generated in each chip in cutting. <P>SOLUTION: A pressure sensitive adhesive sheet is allowed to lie between, and a plurality of ceramic green sheet laminates are piled and fixed by pressure to make one block. The product is cut in a block state. The pressure sensitive adhesive sheet is separated by heating after cutting. The pressure sensitive adhesive sheet has preferably a property that a tackiness is extinguished by foaming on heating. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting process of a ceramic green sheet laminated body in a manufacturing process of a laminated ceramic electronic component, and more particularly to a cutting method using a double-sided adhesive sheet.

[0002]

2. Description of the Related Art Recently, the progress toward miniaturized integration of parts has been remarkable. Among them, the demand for monolithic ceramic electronic components is increasing. As parts that use laminated ceramics,
There are laminated ceramic capacitors, laminated chip coils, laminated ceramic substrates, and the like. With the downsizing of electronic components, high dimensional accuracy is required for the ceramic green sheet laminates constituting them, and reduction in manufacturing cost is also required.

As shown in FIG. 2, a plurality of ceramic green sheets 11 are stacked and a ceramic green sheet laminate 12 is prepared by hot pressing or hydrostatic pressing. When the created ceramic green sheet laminate 12 is cut, each ceramic green sheet laminate is aligned and fixed to a support base. The ceramic green sheet laminated body fixed to the support is rotated by a rotary blade composed of a disk having a blade on the periphery to bring the blade edge into contact with the ceramic green sheet laminated body and cut into chip sizes 14 of individual products.

In order to prevent burrs and shape distortions from occurring in individual chips during cutting, there is a limit to the cutting speed by the rotary blade, and usually 10 to cut one sheet.
It is necessary to take 15 minutes.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is free from burrs and shape distortions generated in individual chips at the time of cutting and has high productivity. It is intended to provide a method for cutting the body.

[0006]

In order to solve the above problems, a method of cutting a ceramic green sheet laminate of the present invention is a method of cutting a plurality of ceramic green sheet laminates by interposing a double-sided adhesive sheet and press-bonding them. One block is made into one block, and the block is cut in the state of the block, and after cutting, the double-sided pressure-sensitive adhesive sheet is separated into individual chips.

Further, the double-sided pressure-sensitive adhesive sheet is characterized in that it has the property of being foamed by heating and losing its adhesiveness.

According to the method for cutting a ceramic green sheet laminate of the present invention, a plurality of ceramic green sheet laminates are stacked with a double-sided pressure-sensitive adhesive sheet interposed and pressure-bonded to form one block, which is cut into a product size. To do. If, for example, four ceramic green sheet laminates are stacked into one block without increasing the cutting speed, the productivity of the cutting process is quadrupled. Therefore, it is possible to provide a method for cutting a ceramic green sheet laminate, which does not change the cutting speed and does not cause burrs or shape distortions that occur in individual chips during cutting and has high productivity.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a method for cutting a ceramic green sheet laminate according to the present invention will be described in detail with reference to FIG. FIG. 1 is a diagram showing a method of cutting the ceramic green sheet laminate of the present invention.

As an example, 15 parts by weight of a resin, 5 parts by weight of a plasticizer, 2 parts by weight of a dispersant, and 100 parts by weight of a solvent are added to a ceramic powder having an average particle size of 0.3 μm, and then 24 together with a medium such as zirconia balls is used. Ball mill mixing is performed for an hour to prepare the raw material mixture for the ceramic green sheets. This mixture is mixed with 10 at a pressure of about 0.005 MPa.
The mixture is stirred and degassed for minutes, and the obtained slurry is used to prepare a green sheet 1 having a thickness of 20 to 40 μm by a method such as a doctor blade method.

After punching the prepared green sheet 1 into a square with a predetermined size, punching is performed using a mega punch or a laser punch, a pattern is printed with a conductor paste, and, for example, several tens of green sheets are laminated to form a green sheet. Perform press molding for 100 seconds at a pressure of 50 MPa at a temperature of 80 ° C,
Ceramic green sheet laminate 2 with a thickness of about 0.5 mm
Are created (see FIGS. 1A and 1B).

A plurality of ceramic green sheet laminates 2
After the pressure-sensitive adhesive sheet 3 is sandwiched between the ceramic green sheet laminates 2 and 2 and laminated, the plate-shaped block 4 is prepared by pressure bonding. Here, the pressure-sensitive adhesive sheet 3 has a property of being foamed by heating and losing its adhesiveness. At this time, each ceramic green sheet laminate 2, 2
Positioning is performed with a jig so that each chip size can be accurately cut with one cutting. In FIG. 1, the number of integrated ceramic green sheet laminates is two, but of course the present invention is not limited thereto (see FIGS. 1 (c) and 1 (d)).

The plate-shaped blocks 4 are aligned for each block, and the blocks 4 are fixed to the support base. A plate-shaped block 4 fixed to a support is rotated by a rotary blade composed of a disk having a blade on the periphery to bring the blade edge into contact with the surface of the block 4 and cut into individual product chip sizes. After cutting, a large number of individual chip size ceramic greensheet laminate blocks 5 are obtained (FIG. 1).
(See (e)).

The block 5 is composed of a plurality of ceramic green sheet laminates 6 cut into individual chip sizes and joined in the vertical direction via an adhesive sheet 7. By heating this to about 150 ° C., the individual chip-size ceramic green sheet laminates 6 are separated from the bonded adhesive sheets 7 (see FIG. 1 (f)).

The pressure-sensitive adhesive sheet 3 is a sheet having a double-sided adhesiveness and a thickness of about 150 μm, and one side thereof is foamed by heating to lose the adhesiveness. For example, Riva Alpha (trade name) manufactured by Nitto Denko Corporation is suitable. By stacking two of these sheets, both surfaces of the sheet are foamed when heated and lose their adhesiveness, and the both surfaces are joined to the respective ceramic green sheet laminates 2, 2.

According to the method of cutting the ceramic green sheet laminate described above, a plurality of ceramic green sheet laminates can be cut at a time to obtain individual chip size ceramic green sheet laminates.
Productivity is dramatically improved. Although it depends on the chip size, it takes about 10 to 15 minutes to cut one block. It takes about 10 minutes to separate and screen the pressure-sensitive adhesive sheet, but if the number of ceramic green sheet laminates to be integrated is increased, the effect of saving man-hours becomes large.

When the dimensions of the individually divided chips were measured, the occurrence rate (%) of chips having nonstandard dimensions was found to be:
The larger the number of ceramic green sheet laminates to be integrated, the larger the tendency. It is considered that this is because the influences of stacking misalignment at the time of integrating the blocks and distortion at the time of cutting increase as the number of ceramic green sheet stacks to be integrated increases. Therefore, it is desirable to keep the thickness of the block to 3 mm or less. The situation is summarized in Table 1.

[0018]

[Table 1] Here, the integrated number is the number of ceramic green sheet laminated bodies to be integrated.

Although one embodiment of the present invention has been described so far, it is needless to say that the present invention is not limited to the above embodiment and may be implemented in various different forms within the scope of the technical idea thereof.

[0020]

As described above, according to the present invention, a plurality of ceramic green sheet laminated bodies are superposed and pressure-bonded with an adhesive sheet interposed therebetween to form one block, which is cut into a product size. As a result, for example, a ceramic green sheet laminate is
The productivity of the cutting process is 4 if the sheets are stacked into one block.
Doubled. Therefore, according to the present invention, it is possible to provide a method of cutting a ceramic green sheet laminate, which is free from burrs and shape distortions that occur in individual chips during cutting and has high productivity.

[Brief description of drawings]

FIG. 1 is a diagram showing a method of cutting a ceramic green sheet laminate of the present invention.

FIG. 2 is a diagram showing a method for cutting a conventional ceramic green sheet laminate.

[Explanation of symbols]

1 Green Sheet 2 Ceramic Green Sheet Laminate 3 Adhesive Sheet 4 Block 5 Cut Block 6 Ceramic Green Sheet Laminate 7 Cut to Chip Size Adhesive Sheet 11 Green Sheet 12 Ceramic Green Sheet Laminate 13 Cut Ceramic Green Sheet Laminate 14 Ceramic green sheet laminate cut to chip size

Claims (2)

[Claims] 1. A method for cutting a ceramic green sheet laminate, comprising stacking a plurality of ceramic green sheet laminates with a double-sided pressure-sensitive adhesive sheet interposed between them, press-bonding them into one block, and cutting and cutting in the state of the block. A method for cutting a ceramic green sheet laminate, which comprises separating the double-sided pressure-sensitive adhesive sheet by post-heating. 2. The method of cutting a ceramic green sheet laminate according to claim 1, wherein the double-sided pressure-sensitive adhesive sheet has a property of losing the pressure-sensitive adhesiveness by heating.