JP2004160739A - Method for working ceramic green sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for working a ceramic green sheet by which its releasability from a carrier film after cutting is enhanced and the successful conveyability of the carrier film can be ensured. <P>SOLUTION: The method for working this ceramic green sheet comprises the following steps: the carrier film 1 with the ceramic green sheet 2 formed to a specified thickness on the surface is conveyed onto a cutting table 10 and sucked/retained there; a cutting edge 21 is lowered to cut the sheet 2 to a specified shape; and the cut sheet 2' is sucked/retained using a suction cup 22 and released from the carrier film 1. In addition, an underlay sheet 12 formed of an air-permeable elastic material is arranged on the table face of the cutting table 10, then the carrier film 1 is conveyed over the underlay sheet 12 and the sheet 2 is cut while the carrier film 1 is sucked/retained through the underlay sheet 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of processing a ceramic green sheet when manufacturing a multilayer electronic component such as a multilayer ceramic capacitor and a multilayer LC filter.
[0002]
[Prior art and problems]
Conventionally, in the case of an electronic component such as a multilayer ceramic capacitor, as shown in FIG. 3, a ceramic green sheet 2 is formed on a cut table 10 provided with a suction hole 11 and provided with a suction holding function. The carrier film 1 is fed in, and while the carrier film 1 is being sucked and held, the cutting head 20 composed of the cutting blade 21 and the suction plate 22 is lowered to punch the ceramic green sheet 2 into a predetermined shape, and the punched ceramic green After the sheet 2 is sucked and held by the suction board 22 and peeled off from the carrier film 1, the sheet 2 is conveyed to a lamination stage which is the next step.
[0003]
By the way, in recent years, with the miniaturization and large capacity of the multilayer electronic component, further thinning of the ceramic green sheet has been required, and it has become difficult to peel off the carrier film after cutting it on a cut table. ing. In particular, as shown in FIG. 3, when the carrier film 1 is sucked and held directly on the hard cutting table 10, the cutting edge of the cutting blade 21 only bites into the carrier film 1 and the cut end of the ceramic green sheet 2 is It is difficult to obtain a trigger for peeling off from No. 1 and the peeling may not be performed smoothly.
[0004]
Further, in the conventional cut table and the peeling table, since the table surface (transport surface) is hard, if the parallelism between the table surface and the suction plate is out of order, the suction plate hits the sheet one-sidedly. There is also a risk of damaging the sheet. This means that the adjustment of the parallelism between the table surface and the suction plate and the adjustment of the position of the cutting blade are delicate and complicated.
[0005]
[Patent Document 1]
JP-A-10-284346 (particularly, FIG. 7, paragraphs 0021 and 0032)
[0006]
In addition, in Patent Document 1, as a pre-process of laminating the ceramic green sheets, in a process of cutting the ceramic green sheets on the carrier film, elastic material such as rubber or an elastomer material is provided at a portion of the peeling table which receives the lateral cutting blade. It is disclosed to bury the embedment.
[0007]
However, Patent Literature 1 does not elucidate the causal relationship between embedding a resilient material such as rubber in a portion receiving a cutting blade and the ease of peeling of a cut ceramic green sheet.
[0008]
Therefore, an object of the present invention is to provide a method for processing a ceramic green sheet having improved peeling performance from a carrier film after cutting. Another object of the present invention is to provide a method of processing a ceramic green sheet, which has good transportability of a carrier film on a cut table and does not cause a shift in a cutting position. It is still another object of the present invention to provide a method for processing a ceramic green sheet in which the position of a transfer surface of a cut table and a suction plate or a cutting blade can be easily adjusted.
[0009]
Means and Action for Solving the Problems
In order to achieve the above object, the present invention provides a carrier film having a ceramic green sheet formed on a surface thereof having a predetermined thickness, which is conveyed onto a cutting table and held by suction, and the cutting blade is lowered to lower the ceramic green sheet. Is cut into a predetermined shape, and the cut ceramic green sheet is sucked and held by the suction plate and peeled from the carrier film. The carrier sheet is placed on the underlay sheet, the carrier film is conveyed onto the underlay sheet, and the ceramic green sheet is cut by sucking and holding the carrier film via the underlay sheet.
[0010]
In the processing method according to the present invention, when cutting the ceramic green sheet by lowering the cutting blade, the tip of the cutting blade cuts into the underlay sheet through the carrier film, and the underlay sheet and the carrier film are locally smallly curved. I do. At the time of this small bending, a shift (slip) occurs between the carrier film and the ceramic green sheet, which triggers peeling. As a result, when the cut ceramic green sheet is suction-held by the suction board, the releasability of the sheet from the carrier film is improved.
[0011]
Moreover, since the underlying sheet made of elastic material is arranged on the table surface, the positional relationship between the table surface and the suction plate or the cutting blade is so strict compared to the case where the sheet is processed on a hard table surface. Alignment is not required, and these position adjustments are facilitated.
[0012]
Furthermore, since the underlay sheet has air permeability, it does not impair the suction holding function of the cut table, there is no possibility that the set position of the positioning detection mark varies, and thus the accuracy of the lamination position is reduced. Can be prevented.
[0013]
In the processing method according to the present invention, the underlay sheet is preferably made of an elastic material having a low coefficient of friction. Since the underlay sheet constitutes a low-friction transport surface, the tension acting on the film is excellent in transportability of the carrier film. There is no fluctuation, and the mark for positioning detection is not distorted. Therefore, it is possible to accurately position the sheet.
[0014]
Further, it is preferable to use a porous sheet as the underlay sheet, and its porosity is suitably about 15 to 50%, and its thickness is preferably about 100 to 500 μm. The thickness of the underlay sheet is suitably 2 to 5 times the thickness of the film in relation to the carrier film.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a method for processing a ceramic green sheet according to the present invention will be described with reference to the accompanying drawings.
[0016]
In the method for processing a ceramic green sheet according to the present invention, first, a ceramic slurry is applied to a surface of the carrier film 1 shown in FIG. 1 to a predetermined thickness and dried to form a ceramic green sheet 2. Internal electrodes (not shown) are formed on the sheet 2 in a predetermined pattern. Further, a mark (not shown) for positioning detection is also provided on the sheet 2.
[0017]
In order to facilitate the peeling of the ceramic green sheet 2 from the carrier film 1 after the cutting step described below, a release agent or the like is applied to the surface of the film 1 before the sheet 2 is formed. It is preferable to keep it.
[0018]
The carrier film 1 has a thickness of 30 to 50 μm, and a polyester (PE) film, a polypropylene (PP) film, a polyethylene terephthalate (PET) film, or the like is used. The ceramic green sheet 2 is applied by a doctor blade method, a die coater method, a gravure printing method, or the like, and has a thickness of 1 to 30 μm.
[0019]
The carrier film 1 provided with the sheet 2 is conveyed as shown by an arrow A in FIG. The cut table 10 has a large number of suction holes 11 formed in the table surface, and an underlay sheet 12 is arranged on the table surface over the entire area of the table surface on which the carrier film 1 is conveyed.
[0020]
The underlay sheet 12 is made of an elastic material having air permeability and a low coefficient of friction, for example, a high-molecular polyethylene resin, and has a thickness of 100 to 500 μm, preferably 2 to 5 times the thickness of the carrier film 1, and a porosity of 15 to 50. %, And a coefficient of dynamic friction with respect to the carrier film 1 of 0.2 or less is preferably used. In order to fix the underlay sheet 12 to the table surface, a spray glue or the like is used, or a plate-shaped fixing jig (not shown) is used.
[0021]
To illustrate the characteristics of the underlay sheet 12 used in the present embodiment, the dynamic friction coefficient at 20 to 100 ° C. is 0.05 to 0.2, and the tensile strength is 1.5 to 3.5 kg / 25 mm width. Further, the dynamic friction coefficient when the underlay sheet 12 is in contact with the flat surface and the carrier film 1 is in contact with the spherical surface is 0.05 to 0.1. The dynamic friction coefficient when the underlay sheet 12 is in contact with the spherical surface and the carrier film 1 is in contact with the flat surface is 0.1 to 0.2.
[0022]
Immediately above the cut table 10, a cutting head 20 including a cutting blade 21 and a suction plate 22 is installed so as to be able to move up and down. The cutting blade 21 is for cutting (punching) the ceramic green sheet 2 on the carrier film 1 into a predetermined rectangular shape, and is arranged around the suction disk 22. The suction plate 22 has a large number of suction holes 23 formed on its suction surface (lower surface). The suction plate 22 sucks the cut sheet 2 ′ as described below, and conveys the cut sheet 2 ′ to a laminating table which is the next step.
[0023]
The carrier film 1 provided with the sheet 2 is fed onto a cut table 10 as shown by an arrow A, and is conveyed on an underlay sheet 12. Then, the mark for positioning detection attached to the sheet 2 is detected by a figure identification device (not shown), and is fixed at a predetermined position with respect to the cutting blade 21. This fixation is performed by operating the suction function of the cut table 10 to suction-hold the carrier film 1 via the underlay sheet 12.
[0024]
The cutting blade 21 and the suction plate 22 are lowered with respect to the ceramic green sheet 2 whose position is fixed as described above, the sheet 2 is cut into a predetermined rectangular shape by the cutting blade 21, and the cut sheet 2 'is sucked. It is adsorbed by the board 22 and peeled off from the carrier film 1.
[0025]
When cutting the ceramic green sheet 2 by lowering the cutting blade 21, as shown in FIG. 2, the tip of the cutting blade 21 bites into the underlay sheet 12 via the carrier film 1, and the underlay sheet 12 and the carrier film 1 are separated. Small, locally curved. At the time of this small bending, a displacement (slipping) occurs between the carrier film 1 and the ceramic green sheet 2, which triggers peeling. As a result, when the cut sheet 2 ′ is suction-held by the suction board 22, the sheet 2 ′ is easily peeled off from the carrier film 1.
[0026]
In the present embodiment, since the underlay sheet 12 made of an elastic material is arranged on the table surface, compared with the case where the sheet is processed on the hard table surface, the table surface and the suction plate 22 or the cutting blade 21 are not used. The positional relationship is not required to be so strict, and these positional adjustments are easy.
[0027]
In addition, since the underlay sheet 12 is made of a material having a low friction coefficient and forms a transport surface, the transportability of the carrier film 1 is good, and the tension acting on the film 1 does not vary, and positioning is performed. The sheet 2 can be accurately positioned without the detection mark being distorted.
[0028]
Furthermore, since the underlay sheet 12 has air permeability, the suction holding function of the cut table 10 is not impaired, the set position of the positioning detection mark does not vary, and the cut sheet 2 ' The accuracy of the stacking position does not decrease.
[0029]
(Other embodiments)
The method for processing a ceramic green sheet according to the present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the gist.
[0030]
In particular, the present invention is applicable not only to the manufacturing process of the multilayer ceramic capacitor but also to the manufacturing process of a wide variety of multilayer electronic components such as a multilayer inductor, a multilayer LC filter, a multilayer noise filter, and a multilayer substrate. Can be. Of course, an electronic component manufactured using a single ceramic green sheet may be used. In some cases, plain ceramic green sheets on which internal electrodes are not formed are handled.
[0031]
【The invention's effect】
As apparent from the above description, according to the present invention, since the underlay sheet made of an elastic material having air permeability is arranged on the table surface of the cut table having the suction holding function, the ceramic green sheet on the carrier film is provided. Can be cut with good releasability. Moreover, since the ceramic green sheet is cut not on a hard table surface but on an elastic underlay sheet, the degree of parallelism between the table surface and the suction plate and the positional relationship between the cutting blade and the cutting blade are required to be so strict. Therefore, these position adjustments are facilitated.
[0032]
Furthermore, since the underlay sheet has air permeability, it does not impair the suction holding function of the cut table, there is no possibility that the set position of the positioning detection mark varies, and the accuracy of the lamination position of the cut sheet is reduced. Can be prevented.
[0033]
Also, if an underlay sheet made of an elastic material having a low coefficient of friction is used, the carrier film can be transported well, the tension acting on the film during transport is not varied, and the mark for positioning detection is distorted. In addition, the ceramic green sheet can be accurately positioned.
[Brief description of the drawings]
FIG. 1 is a sectional view showing one embodiment of a method for processing a ceramic green sheet according to the present invention.
FIG. 2 is an explanatory diagram when a ceramic green sheet is cut in the processing method shown in FIG. 1;
FIG. 3 is an explanatory diagram when a ceramic green sheet is cut in a conventional processing method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Carrier film 2 ... Ceramic green sheet 2 '... Cut ceramic green sheet 10 ... Cut table 11 ... Suction hole 12 ... Underlay sheet 20 ... Cutting head 21 ... Cut blade 22 ... Suction board A ... Transport direction

Claims (5)

A carrier film having a ceramic green sheet formed to a predetermined thickness on the surface is conveyed onto a cut table and suction-held, the cutting blade is lowered to cut the ceramic green sheet into a predetermined shape, and the cut ceramic is cut. In a method of processing a ceramic green sheet, in which a green sheet is sucked and held by a suction board and peeled from a carrier film,
An underlay sheet made of a breathable elastic material is arranged on the table surface of the cut table, and the carrier film is conveyed onto the underlay sheet, and the carrier film is sucked and held through the underlay sheet to form the ceramic green. Cutting sheets,
A method for processing a ceramic green sheet. The method according to claim 1, wherein the underlay sheet is made of an elastic material having a low coefficient of friction. The method according to claim 1, wherein a porous sheet is used as the underlay sheet. The method of processing a ceramic green sheet according to claim 1, wherein the underlay sheet has a porosity of 15 to 50%. The method according to claim 1, wherein the underlay sheet has a thickness of 100 to 500 μm. 6.

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