JP2001341121A - Method for cutting high hardness sheet body and adhesive sheet used in the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the life of a diamond blade in a method in which a high hardness sheet body is adhered/fixed to an adhesive sheet, and the sheet body is cut. SOLUTION: In the adhesive sheet, an abrasive particle layer and an adhesive layer are laminated in turn. In the abrasive particle layer, abrasive particles 20-100 μm in average particle size the Vickers hardness of which is 4,000 or below and higher than the Vickers hardness of the sheet body and the hardness of a diamond blade base material are dispersed in a ratio of 60-90 wt.% in a resin. In the diamond blade, fine diamond particles 2-100 μm in average particle size are dispersed in a ratio of 1-50 vol.% in a base material the Vickers hardness of which is 100-2,000.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a high-hardness sheet and a pressure-sensitive adhesive sheet used therefor.

[0002]

2. Description of the Related Art Conventionally, a high-hardness sheet body, for example, a ceramic sheet used for a circuit board such as a multilayer ceramic capacitor, a multilayer board made of glass fiber and epoxy resin, a ceramic MR (magnetoresistive) head, and a ceramic have been developed. It is known that a high-hardness sheet body such as a green sheet contained at a content rate is completely cut into small pieces in a state of being fixedly adhered on an adhesive sheet. In this case, a diamond blade is generally used for the cutting. When a high hardness sheet is cut with a diamond blade as described above, the cutting performance of the diamond blade deteriorates as the cutting is repeated many times, and it is necessary to sharpen or replace the diamond blade. Performing these operations frequently is not preferable because it takes a lot of time. In order to extend the life of the diamond blade and reduce the number of replacements, a high-hardness sheet body is previously adhered to the adhesive layer surface of an adhesive sheet having an abrasive layer and an adhesive layer formed on the upper surface thereof, A method of completely cutting the blade by lowering the tip of the blade until the blade is positioned within the abrasive layer of the adhesive sheet has been proposed (Japanese Patent Publication No. 2-24872).
No.). However, even in this method, the effect of extending the life of the diamond blade is not yet sufficient, and there is a demand for a longer life of the diamond blade.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a method for completely cutting a high-hardness sheet with an adhesive sheet and completely cutting the sheet with a diamond blade.
It is an object of the present invention to provide a method for extending the life of the diamond blade and a pressure-sensitive adhesive sheet used therefor.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. That is, according to the present invention, the Vickers hardness is 5
A method for cutting a high-hardness sheet body of at least 00 into small pieces, comprising: (i) bonding the high-hardness sheet body to the adhesive layer surface of an adhesive sheet having an abrasive layer and a removable adhesive layer formed on the upper surface thereof; (Ii) lowering the high-hardness sheet body, which has been pressure-fixed on the pressure-sensitive adhesive sheet, from the surface thereof with a diamond blade until the blade tip is positioned in the abrasive layer of the pressure-sensitive adhesive sheet; A cutting step of completely cutting the high-hardness sheet body, whereby the pressure-sensitive adhesive sheet is formed by laminating an abrasive layer and a pressure-sensitive adhesive layer on one surface of a sheet substrate in this order, The particle layer has a Vickers hardness of 4000 or less in the resin,
And a structure in which abrasive grains having a Vickers hardness higher than the Vickers hardness of the high-hardness sheet body and higher than the hardness of the base material of the following diamond blade and having an average particle size of 20 to 100 μm are dispersed at a ratio of 60 to 90 wt%. On the other hand, the diamond blade has an average particle size of 2 to 10 in a base material having a Vickers hardness of 100 to 2000.
A method for cutting a high-hardness sheet is provided, which has a structure in which 0 μm diamond fine particles are dispersed at a ratio of 1 to 60 vol%. According to the present invention,
The pressure-sensitive adhesive sheet used in the method, wherein the pressure-sensitive adhesive sheet is formed by laminating an abrasive layer and a removable adhesive layer on one side of a sheet substrate in that order, and the abrasive layer is formed in a resin. Abrasive grains having a Vickers hardness in the range of 2000 to 4000 and an average particle size of 20 to 100 μm are 60 to 90 wt.
% Is provided.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The pressure-sensitive adhesive sheet of the present invention is a sheet in which an abrasive layer and a removable pressure-sensitive adhesive layer are laminated on one surface of a sheet substrate in that order. The sheet substrate includes paper and a synthetic resin film, but a synthetic resin film is suitable. Specific examples of such sheet substrates include polyolefin (polyethylene, polypropylene, polymethylpentene, etc.), polyvinyl chloride, polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), polyimide, polyamide, polyurethane, etc. Can be mentioned. Further, those in which these films are superposed (by co-extrusion or lamination) or a laminated film of a synthetic resin film (single layer or multiple layers) and a metal layer can also be used. The thickness of the sheet substrate is 25 to 250 μm, preferably 50 to 125 μm.

The abrasive layer formed on the sheet substrate has a Vickers hardness of 2000 to 4000, preferably 2 in the resin.
000-3000, and higher than the Vickers hardness of the high hardness sheet body, preferably 500-150.
It has a structure in which abrasive grains having a high Vickers hardness of about 0 are dispersed. Examples of the abrasive grains include alumina (white Morundum; Vickers hardness: 2300), silica (Vickers hardness: 600), diamond powder (Vickers hardness: 7000), glass fragments (Vickers hardness: 600), and cerium oxide (Vickers hardness). Hardness: 50
0) and the like. In the present invention, among these abrasive grains, it is particularly preferable to select alumina.

The thickness of the abrasive layer is 25 to 2
It is 00 μm, preferably 50 to 150 μm. The content of the abrasive grains is 60 to 90 wt%, preferably 70 to 90 wt%.
%. The average grain size of the abrasive grains is 20 to 100 μm, preferably 30 to 70 μm. If less than 20 μm, the polishing effect on the diamond blade is insufficient,
On the other hand, if the thickness exceeds 100 μm, no particular improvement in the polishing effect is obtained, and conversely, it becomes difficult to roll the product adhesive sheet in a roll. Further, if the content of the abrasive grains is less than 60 wt%, the effect of sharpening the abrasive grain layer with respect to the tie or the Monde blade becomes insufficient. On the other hand, if it exceeds 90%, it becomes difficult to roll the product granular sheet in a roll.

[0008] A binder resin is used in the abrasive layer to bind the abrasive to the sheet substrate. The binder resin includes a thermoplastic resin and a curable resin. The curable resin includes a thermosetting resin, a photocurable resin, and the like. As these resins,
Conventionally known various types can be used. In the present invention, when a thermoplastic resin is used, an abrasive layer containing the resin having a glass transition temperature in the range of 10 to 40 ° C. is preferably used. When a curable resin is used, the glass transition temperature of the abrasive layer containing the cured resin is 10 to 40 ° C.
Are preferably used. If the glass transition temperature is less than 10 ° C., if the sheet is wound into a roll before the application of the adhesive layer, the abrasive layer is likely to be blocked, causing a problem in production. Its glass transition temperature is 40
If the temperature is higher than ℃, when the pressure-sensitive adhesive sheet is manufactured in a roll form, cracks are liable to occur in the abrasive grain layer, and the pressure-sensitive adhesive sheet is liable to curl. In the present invention, it is preferable to use a thermosetting acrylic resin composition, urethane resin composition, or epoxy resin composition from the viewpoints of heat resistance, solvent resistance, workability, and the like of the abrasive layer.

The abrasive layer can be obtained by a conventionally known method, for example, by applying a coating solution containing abrasive particles and a binder resin on a sheet substrate and heating the coating solution. In this case, a known auxiliary additive such as a leveling agent, a thixotropic agent, and a defoaming agent may be added to the coating solution.

In the present invention, an adhesive layer is formed on the upper surface of the abrasive layer. In this case, the adhesive layer has removability. Removable adhesive layer is a method of applying a material such as ceramic to the adhesive layer and then applying heat or irradiating ultraviolet rays or electron beams to the adhesive layer. It means a pressure-sensitive adhesive layer capable of reducing the force and releasing the pressure-sensitive adhesive layer (pressure-sensitive adhesive sheet) from the material. Such an adhesive layer is conventionally known. In this case, the strength for peeling the adhesive layer from the material (peel strength: peel adhesive strength measured by a 180-degree peel method according to JIS Z 0237) is preferably 0.49 N / 25 mm or less. In the present invention, the pressure-sensitive adhesive layer is preferably a pressure-sensitive adhesive layer containing a thermal foaming agent.
This adhesive layer, by heating, the thermal foaming agent foams,
It greatly reduces the adhesive strength of the adhesive layer. The ratio of the thermal foaming agent contained in the adhesive layer is 5 to 40% by weight. If it is less than 5%, it is difficult to peel off due to insufficient foaming during heating. Also 40
%, The function of the adhesive layer cannot be obtained. Known heat-expandable globules can be used as the thermal foaming agent. To be specific, microspheres F-1400D and F-50D manufactured by Matsumoto Yushi Co., Ltd. are exemplified. As the pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer, various conventionally known pressure-sensitive adhesives such as acrylic, rubber, urethane, and silicone can be used.

The diamond blade used in the present invention for completely cutting a high hardness sheet body has a structure in which diamond particles are dispersed in a low hardness base material.
In this case, the matrix material has a Vickers hardness of 1
00-2000, preferably 200-600 materials are used. The Vickers hardness of the base material is preferably set to a Vickers hardness lower by about 10 to 1500 than the Vickers hardness of the abrasive grains. Such a base material includes a metal or a metal compound (such as an oxide). Specific examples thereof include copper, bronze, cobalt, and electroplated nickel. The average particle size of the diamond fine particles dispersed in the base material is 2 to 100 μm.
m, preferably 3 to 20 μm. If the average particle size is larger than the upper limit of the above range or smaller than the lower limit of the above range, there arise problems such as the effect of the pressure-sensitive adhesive sheet being hardly obtained. The ratio of the diamond fine particles contained in the diamond blade is 1 to 60 vol%, preferably 5 to 50 vol%.
vol%. If the ratio of the diamond fine particles is more than the above range, the problem of weakening the force for holding the diamond fine particles and the falling off of the fine particles will occur.

The method for producing the diamond blade is not particularly limited, and various conventionally known methods, for example, a sintering method in which a mixture of diamond fine particles and a base material particle is molded and pressure-sintered, There is an electroforming method or the like in which fine particles of diamond are present and a base metal is bonded by electroplating, and the fine diamond particles are fixed with a plated metal (base metal). In the electroforming method, in order to obtain a diamond blade having a predetermined thickness, a step of electroplating a base metal in the presence of fine diamond particles on its metal plating surface may be repeated.

In the present invention, the cutting material used for cutting the high-hardness sheet body is a rotating body whose outer peripheral end is formed on a diamond blade (cutting blade).
The overall structure of the rotating body is not particularly limited as long as the outer peripheral end of the rotating body is formed on a diamond blade.
Conventionally known structures, for example, those having a structure in which a diamond blade is disposed at the outer peripheral end of a disk such as stainless steel, and a disk-shaped molded body having a structure in which diamond fine particles are dispersed in a base material as a whole, There is one in which the outer peripheral end is formed on a blade (blade tip).

The high-hardness sheet used as the object to be cut in the present invention includes those having a Vickers hardness of 500 or more, especially 700 or more. The upper limit of the Vickers hardness is usually about 3000. Examples of the high-hardness sheet include a ceramic sheet and a sheet containing ceramic. Such a high-hardness sheet body includes, for example, a ceramic sheet used for a circuit board such as a thin-layer ceramic capacitor, a laminated board made of glass fiber and epoxy resin, a ceramic MR (magnetic resistance) head, and a high content of ceramic. And the like. In a high hardness sheet body, the thickness is usually 0.1 mm.
5 to 3 mm, its vertical length is 50 to 150 mm, and its horizontal length is about 50 to 300 mm.

In order to completely cut (full-cut) a high-hardness sheet body according to the present invention, first, the high-hardness sheet body is adhesively fixed to the surface of the pressure-sensitive adhesive sheet on the removable adhesive layer (adhesion step). Such an adhesion step can be performed by a conventionally known method. Next, the high-hardness sheet adhered and fixed on the pressure-sensitive adhesive sheet is completely cut from its surface by a diamond blade (cutting step).
In this case, the tip of the diamond blade is lowered to a position in the abrasive layer of the adhesive sheet. Thereby, the tip of the diamond blade is polished by the abrasive grains in the abrasive grain layer. As described above, a cut product in which small pieces of the high-hardness sheet are adhered to the pressure-sensitive adhesive sheet is obtained, which is sent to a subsequent processing step, and after being subjected to appropriate processing, the pressure-sensitive adhesive sheet The small pieces are peeled from the pressure-sensitive adhesive sheet by utilizing the re-peelability of the adhesive.

FIG. 1 is an explanatory state diagram in the case where a high hardness sheet is cut by a diamond blade. In FIG. 1, 1 is a diamond blade, 2 is a blade support, 11 is a high-hardness sheet, 15 is an adhesive sheet, 12 is a removable adhesive layer, 13 is an abrasive layer, and 14 is a sheet substrate. The length L from the lower end surface of the blade support 2 to the tip of the blade 1 indicates the length of the blade. This blade length is the blade length before use and is represented by the following equation. 10 × T ≦ L ≦ 30 × T (1) In the above formula, L indicates the blade length, and T indicates the thickness of the blade. The blade thickness T is usually 0.01 to 0.5 m
m, preferably about 0.05 to 0.2 mm. The length β of the blade 1 before use from the lower end of the blade support 2 indicates an ineffective blade length. On the other hand, the blade length α obtained by removing the ineffective blade length β from the length from the upper surface of the high hardness sheet body 11 to the lower end of the blade support indicates the effective blade length. Ineffective blade length β
Is the blade length required to eject a cooling medium (cooling water or the like) from the tip of the liquid nozzle and collide with the blade to cool the blade. The blade length β is usually about 0.1 to 1 mm. Effective blade length α
Is the allowable length of wear when the blade wears from its tip and becomes shorter due to its use. The effective blade length α
Is lost, the blade needs to be replaced.
Therefore, the life of the blade is determined by the effective blade length α.

The effective blade length α is represented by the following equation. α = L− [β + T (11) + T (15)] (2) In the above formula, β is the length of the ineffective blade, T (11) is the thickness of the high-hardness sheet, and T (15) is the thickness of the adhesive sheet. Indicates the thickness. The effective blade length α is preferably as long as possible because the shorter the effective blade length α, the shorter the life of the blade.However, if the effective blade length α is too long, the blade is easily bent, so that a high-hardness sheet body can be cut with high precision. Disappears. As described above, the blade according to the present invention is designed so as to have a structure in which diamond particles having a Vickers hardness of 100 to 2000 and an average particle size of 2 to 100 μm are dispersed at a ratio of 1 to 60 vol%, On the other hand, the abrasive layer of the adhesive sheet is designed to contain a large amount of abrasive particles of high Vickers hardness, and the blade tip is effectively polished by the abrasive layer, so the cutting performance of the blade is:
Regardless of the number of times the high-hardness sheet body is cut, high performance is always maintained. In the case of the present invention, the blade effective length α is such that the cutting performance of the blade is always maintained at a high level, so that the high hardness sheet body can be cut smoothly. As a result, since bending stress is less likely to occur on the blade, the effective blade length α can be increased, and a blade with an extended life can be obtained. In the case of the present invention, the effective blade length α can be set to 20 to 30 times the blade thickness T.

When the high-hardness sheet is completely cut as described above, the high-hardness sheet can be cut with high precision, and the life of the diamond blade can be significantly extended. That is, in the case of the present invention, the diamond blade has a structure in which diamond fine particles are dispersed in a base material having a low hardness as described above, and the abrasive layer of the pressure-sensitive adhesive sheet has an abrasive layer having a high hardness. When the diamond blade tip is lowered to a position in the abrasive layer of the pressure-sensitive adhesive sheet to completely cut the high-hardness sheet body, the tip surface of the diamond blade is The abrasive layer is strongly polished by the abrasive grains. By the polishing with the abrasive grains, the low-hardness base material that has constituted the diamond blade and has served as a binder for the diamond fine particles is removed by abrasion. When the low hardness base material is removed from the blade tip surface, the base material is dispersed (buried) in the base material.
The fine diamond particles that have been removed are also removed from the blade tip surface. As a result, new diamond fine particles are exposed at the tip surface of the diamond blade, and good cutting performance of the diamond blade is maintained. In this way, the tip surface of the diamond blade is always maintained at a high level of cutting performance, so that when the blade is lowered to cut the high-hardness sheet body, the cutting can be performed smoothly. That is, in this cutting, substantially only a stress that vertically lowers the blade is applied to the blade, and substantially no bending stress is generated on the blade. Therefore, even if the effective blade length α is increased, the blade can be prevented from bending at the time of cutting, and the life of the blade can be greatly extended.
The amount of wear of the blade was about 0.
It is about 1 to 1 mm, and in the case of the present invention, one new blade can usually perform 20,000 or more cuts.

[0019]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Example 1 A Vickers hardness of 200 was added to 100 parts by weight of a solution obtained by dissolving a thermosetting acrylic polyol (having a hydroxyl value of 18: solid) in an organic solvent so as to have a content of 50 wt%.
0, 150 parts by weight of alumina having an average particle diameter of 30 μm are mixed and dispersed, and an isocyanate-based curing agent (NCO content: 13 mol%: solid) is dissolved in an organic solvent so as to have a content of 75 wt%. Is blended so that the NCO content and the acrylic polyol are equivalent,
An abrasive layer forming coating solution was prepared. Apply this coating solution to a thickness of
An abrasive layer is formed on a PET (polyethylene terephthalate) film (hereinafter referred to as a first PET film) having a thickness of 100 μm by a roll coater so that the thickness of the abrasive layer after drying is 100 μm. This was made into a film, which was wound into a roll on a core material having a diameter of 6 inches. The abrasive layer formed on this film has a structure in which abrasive particles are dispersed in the cured resin in an amount of 75 wt% (based on the abrasive layer). The glass transition temperature is determined by the TMA penetration mode method (JIS).
It was 32 ° C. when measured by a test method according to K 7196). In the process of unwinding the film from the roll-up, no blocking or cracking of the abrasive layer coating was observed.

Acrylic adhesive (mostly n-butyl acrylate having a weight average molecular weight of 390000: liquid)
Is dissolved in an organic solvent to a content of 45 wt% in 100 parts by weight of a heat-expandable sphere (average particle diameter of 1).
5 μm: Microsphere F-50 manufactured by Matsumoto Yushi Co., Ltd.
D) 11.3 parts by weight of a solution prepared by dissolving a TDI (tolylene diisocyanate) -based crosslinking agent (NCO content: 13 mol%: solid) in an organic solvent so as to have a content of 45 wt%. Was added to prepare a coating solution for forming a removable adhesive layer. This coating solution is applied to a silicone film-treated PET film (hereinafter referred to as a “second PET film”) with a pressure-sensitive adhesive layer having a thickness of 5 after drying with a roll coater.
A film having an adhesive layer is formed by applying the film so as to have a thickness of 0 μm, and drying by heating. The film is formed by unwinding the film from the roll of the film on which the abrasive layer is formed, on the adhesive layer of the film. The layer surfaces were stuck, and this stuck film was wound up in a roll around a 6-inch diameter core material. The resulting film has a four-layer structure. That is, on the first PET film, an abrasive layer, a removable adhesive layer,
The second PET film has a structure laminated in this order. In the step of unwinding the film from the roll of the film on which the abrasive layer was formed, the film could be smoothly unwound without the problems of blocking and cracking caused by the abrasive layer.

Next, the sheet-like four-layer structure is set on the pedestal of the cutting device, and the second member located at the uppermost position is set.
Was peeled off, and the removable adhesive layer was exposed to form an adhesive sheet. Next, a sheet-like glass cloth is impregnated with the epoxy resin composition, thermally cured, and then provided with a copper foil layer on the surface, and has a Vickers hardness of 800 and has a sheet-like laminate (thickness 1 mm, width 500 mm, length 500mm)
Was pressure-fixed onto the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet, and was completely cut by lowering the tip of the pressure-sensitive adhesive sheet to a position in the abrasive layer of the pressure-sensitive adhesive sheet with a diamond blade. As a diamond blade, 25 vol. Of diamond fine particles (Vickers hardness: 7000 or more) having an average particle diameter of 30 μm in a copper alloy having a Vickers hardness of 400 are used.
% Was used. This blade was attached to the outer peripheral end of a disk-shaped base metal (outside diameter 2 inches, thickness 0.1 mm) to obtain a cutting member. The details of the blade in this cutting member are as follows. Blade length L: 2 mm Blade thickness T: 0.1 mm Effective blade length α: 0.68 mm Non-effective blade length β: 0.1 mm

The cutting conditions are as follows: the number of revolutions of the disk-shaped cutting member: 30,000 times / minute, the feeding speed of the diamond blade in the direction along the surface of the laminated plate: 60 mm / sec, the cutting depth from the upper surface of the adhesive layer of the blade. : 100 μm.

As described above, when 100 laminates were cut one after another, all the laminates could be cut smoothly. In this case, the blade has a length of 0.05 mm
Disappeared due to wear. On the other hand, the effective blade length is 0.
Since it is 68 mm, the blade can cut 1200 sheets of the laminate. After cutting into small pieces, the pressure-sensitive adhesive sheet was subjected to a heat treatment at 150 ° C. for 10 seconds, so that the small pieces had no adhesive residue and could be easily peeled from the pressure-sensitive adhesive layer. The softening temperature is J
It is measured according to IS K 7196.
In this case, the indenter for measurement is 1.0 ± 0.05 mm
A column having a length of 10 mm is used. The rate of temperature rise during the measurement was 10 ° C./min, and the pressure on the indenter was 5 gf. The Vickers hardness is measured by a microhardness test method according to JIS G0202.

Example 2 A pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1 except that the content of abrasive grains in the abrasive layer of the pressure-sensitive adhesive sheet was 60 wt%, and an experiment was carried out in the same manner except that this pressure-sensitive adhesive sheet was used. As a result, in this case as well, it was confirmed that 100 laminates could be cut smoothly, and the laminate could be cut smoothly until the effective blade length α disappeared.

Comparative Example 1 An adhesive sheet was prepared in the same manner as in Example 1 except that the content of abrasive grains in the abrasive layer of the adhesive sheet was 50 wt%, and an experiment was conducted in the same manner except that this adhesive sheet was used. As a result, in this case, when the 300 laminated boards were cut, clogging with the resin was caused at the tip of the blade, and the cutting performance of the blade was greatly reduced.

[0027]

According to the present invention, a high-hardness sheet member can be completely cut smoothly and with high precision by a diamond blade having an extended life.

[Brief description of the drawings]

FIG. 1 is an explanatory state diagram in a case where a high-hardness sheet body is completely cut by a diamond blade according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diamond blade 2 Blade support 11 High hardness sheet body 12 Removable adhesive layer 13 Abrasive grain layer 14 Sheet substrate 15 Adhesive sheet

Continued on the front page (72) Inventor Torao Hayashi 4-1-2-1, Ginza, Chuo-ku, Tokyo Inside Somaru Corporation (72) Inventor Satoshi Asai 4-1-2-1, Ginza, Chuo-ku, Tokyo Inside Somaru Corporation (72) Inventor Yukio Sumida 144-7 Tachinai, Okuma Ushibukuro Tatenai, Watari-cho, Watari-gun, Miyagi Pref. (72) Inventor Kenichi Kimura 144-7 Tachinai, Okuma Ushibukuro Tateuchi, Watari-cho, Watari-gun, Miyagi Pref. F term (reference) 3C069 AA01 BA04 CA03 EA03 4J004 AA03 CA04 CA05 CA06 CC02 CE01 DB04 FA05 FA08

Claims (3)

[Claims] 1. A method for cutting a high-hardness sheet body having a Vickers hardness of 500 or more into small pieces, wherein (i) the high-hardness sheet body has an abrasive layer and a removable adhesive layer formed on an upper surface thereof. A pressure-sensitive adhesive step of pressure-sensitively fixing the pressure-sensitive adhesive layer on the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive sheet; A cutting step of completely cutting the high-hardness sheet body by lowering it to a position in the layer, and forming the adhesive sheet by laminating an abrasive layer and an adhesive layer in this order on one surface of a sheet substrate. The abrasive layer has a Vickers hardness of 4,000 or less in the resin, is higher than the Vickers hardness of the high hardness sheet body, and is a base material of a diamond blade described below. Average particle size of the abrasive grains of 20 to 100 [mu] m 60 to 90 having a higher Vickers hardness than degrees
The diamond blade has a Vickers hardness of 100 to 2000.
A method for cutting a high-hardness sheet body, characterized by having a structure in which fine diamond particles having an average particle diameter of 2 to 100 µm are dispersed in a matrix material at a ratio of 1 to 60 vol%. 2. The pressure-sensitive adhesive sheet used in the method according to claim 1, wherein the pressure-sensitive adhesive sheet is formed by laminating an abrasive layer and a removable adhesive layer on one surface of a sheet substrate in that order, The abrasive layer has a Vickers hardness of 2000 to 2000 in the resin.
An adhesive sheet having a structure in which abrasive grains having an average particle diameter in a range of 4000 and having an average particle diameter of 20 to 100 µm are dispersed at a rate of 60 to 90 wt%. 3. The glass transition temperature of the abrasive layer is 10 to 40.
3. The pressure-sensitive adhesive sheet according to claim 2, wherein the temperature is ℃.