JP2002292599A - Multi-layer body sheet for punching work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-layer body sheet for punching work capable of performing punching work accurately in particular causing little axis-vibration of a drill, capable of reducing drill smear and coarse inner walls, and obtaining a high-quality multi-layer body. SOLUTION: The multi-layer body sheet for punching work is so constituted that a mixture of solid lubricant and high polymer chemical compound capable of being mixed with the solid lubricant is laminated on one side of a metal foil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet for drilling a laminate, and more particularly to a laminate for which high precision is required.
The present invention relates to a laminated body drilling sheet which is preferably used even when drilling a small-diameter hole having a diameter of 0.1 to 1.0 mm by a drill.

[0002]

2. Description of the Related Art In recent years, with the spread of personal computers and mobile phones, electronic products have been required to be smaller, lighter and more sophisticated. As a result, the pattern density of printed wiring boards and the like used have been rapidly increasing, and the number of multilayers has rapidly increased.As a result, the line width and spacing of the printed wiring boards have been reduced, and the number of through holes has been reduced as well. Is growing. In addition, high accuracy is inevitably required for the connection hole position. In the future, it is expected that the density of patterns and the number of layers will be further increased, and the number of drilling operations and the reduction in diameter will be further increased.

[0003] In order to perform such small-diameter drilling, in general, a drilling process is performed by laminating a processing sheet on a laminated body, so that the accuracy of the hole position drilled in the wiring board is improved, and burrs are formed. It is known that drilling can be performed without generating a burr.

[0004] The working sheet used here is:
A method of drilling using a thermoplastic film (Japanese Patent Publication No. 7-50831), and a method of drilling a laminate using a sheet in which both surfaces of a metal foil are sandwiched between papers (Japanese Patent Application Laid-Open No. Sho 62)
Japanese Patent Application Laid-Open No. 11-48196), and a method using a sheet in which metal foils are bonded with an adhesive.
And a method of using a sheet made of a water-soluble resin and a water-soluble lubricant for a metal foil (Japanese Patent Application Laid-Open No. 10-335780), etc., have been proposed.

[0005]

[Problems to be solved by the invention]
In the method of drilling using a thermoplastic film described in JP 0831, when a multilayer wiring board is overlapped and drilled, the hole position accuracy is deteriorated. JP-A-62-21
The method of drilling a laminate using a sheet in which both surfaces of an aluminum foil are sandwiched between papers described in Japanese Patent Publication No. 4000 is highly likely to generate paper powder and adversely affect subsequent steps. In the method using a sheet in which an aluminum foil is bonded with an adhesive described in -48196, it is unavoidable that the cost increases because two aluminum foils are bonded.

In the method of using a sheet formed of a water-soluble resin and a water-soluble lubricant on an aluminum foil described in Japanese Patent Application Laid-Open No. 10-335780, the method comprises a water-soluble resin and a water-soluble lubricant. Therefore, there is a problem that it is necessary to control humidity, and furthermore, since the melting point is close to room temperature, temperature control is also required. In addition, entanglement of a water-soluble resin on a drill during processing has been regarded as a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a sheet for drilling a laminated body capable of drilling with high accuracy. It is an object of the present invention to provide a laminated body drilling sheet capable of obtaining a laminated body of high quality by reducing drill smear and inner wall roughness with a small amount.

[0008]

The present invention relates to the following. 1. A sheet for drilling a laminate, comprising a mixture of a solid lubricant and a polymer compound that can be uniformly mixed with the solid lubricant, which is laminated on one surface of a metal foil. 2. A laminate characterized in that a sheet obtained by laminating a mixture of a solid lubricant and a polymer compound that can be uniformly mixed with the solid lubricant on one or both sides of a thermoplastic resin film is bonded to one side of a metal foil. Sheet for drilling. 3. Item 3. The sheet for drilling a laminated body according to Item 2, wherein a mixture of a solid lubricant and a polymer compound that can be uniformly mixed with the solid lubricant, a thermoplastic resin film, and a metal foil are laminated in this order. 4. A mixture of a solid lubricant and a polymer compound that can be uniformly mixed with the solid lubricant, a thermoplastic resin film, a mixture of the solid lubricant and a polymer compound that can be uniformly mixed with the solid lubricant, and a metal foil are laminated in this order. Item 3. The sheet for drilling a laminate according to Item 2. 5. Item 3. The laminated body perforating sheet according to Item 2, wherein a thermoplastic resin film, a mixture of a solid lubricant and a polymer compound which can be uniformly mixed with the solid lubricant, and a metal foil are laminated in this order. 6. Item 6. The sheet for drilling a laminate according to items 2 to 5, wherein the polymer compound is a rubber component. 7. Item 7. The sheet for perforating a laminate according to any one of Items 1 to 6, wherein plastic particles having a particle size of 1 to 100 µm are added to the mixture. 8. Item 8. The sheet for drilling a laminate according to any one of Items 1 to 7, wherein the thickness of the metal foil is 50 to 200 µm. 9. Item 9. The sheet for drilling a laminate according to any one of Items 1 to 8, wherein the hardness of the metal foil is H10 or more.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

A specific example of the present invention will be described with reference to the drawings.
As shown in the cross section in FIG. 1A, the laminated body drilling sheet 13 according to the first embodiment of the present invention is a solid lubricant and a polymer that can be uniformly mixed with the solid lubricant. This is a structure in which a mixture layer 15 with a compound is laminated on one side of the metal foil 5.

When drilling the laminated body 9 using the above-described drilling sheet 13, the surface of the metal foil 5 is directed toward the laminated body 9 as shown in FIG. And is machined by the drill 11. Note that a paper phenol plate 17 is superimposed on the lowermost portion of the laminate 9.

Further, as shown in FIG. 2 (A), the laminated body drilling sheet 19 according to the second embodiment of the present invention has a solid lubricant and a uniform lubricant. Sheet 23 formed by laminating a mixture layer 15 with a mixable polymer compound on one surface of a thermoplastic resin film 21
Is a structure bonded to one surface of the metal foil 5.

When the laminated body 9 is perforated by using the perforated sheet 19, the surface of the metal foil 5 is directed toward the laminated body 9 as shown in FIG. And is machined by the drill 11. Note that a paper phenol plate 17 is superimposed on the lowermost portion of the laminate 9.

Further, as shown in the cross section of FIG. 3A, a laminated body piercing sheet 25 according to a third embodiment of the present invention has a solid lubricant and a uniform lubricant. A sheet 27 formed by laminating a mixture layer 15 with a mixable polymer compound on both surfaces of the thermoplastic resin film 21
Is a structure bonded to one surface of the metal foil 5.

When the laminated body 9 is perforated by using the perforated sheet 25, the surface of the metal foil 5 is directed toward the laminated body 9 as shown in FIG. And is machined by the drill 11. Note that a paper phenol plate 17 is superimposed on the lowermost portion of the laminate 9.

Further, as shown in the cross section of FIG. 4A, a laminated body piercing sheet 28 according to a fourth embodiment of the present invention has a solid lubricant and a uniform lubricant. It is configured such that a mixture layer 15 with a mixable polymer compound is sandwiched between a thermoplastic resin film 21 and a metal foil 5.

When a hole is formed in the laminate 29 by using the above-mentioned sheet 28 for forming a hole, the sheet 28 for forming a hole is formed on the thermoplastic resin film 21 as shown in FIG. Is made to adhere to the laminated body 29 and is processed by the drill 11. The laminate 29
A paper phenol plate 17 is superimposed on the lowermost part of the sheet.

When a hole is formed in the laminated body 29 by using the above-described sheet 28 for forming a hole, the sheet 28 for forming a hole is placed on the surface of the metal foil 5 as shown in FIG. Is made to adhere to the laminate 29 and is processed by the drill 11. Note that a paper phenol plate 17 is superimposed on the lowermost portion of the laminate 29.

In the present invention, solid lubricants include solid paraffin such as whale wax, beeswax, china wax, stone wax, etc.
Examples include polyethylene wax and ester type. Here, there is a role of improving the drill lubricity by melting during the processing of the solid lubricant. The effect is considered to be due to the melting of the solid lubricant during drilling. The melting point is preferably 30 to 100 ° C. Further, in order to further improve the lubricity, a lubricating oil such as a synthetic oil represented by a diphenyl ether type, an ester type or a silicone type, or a mineral oil may be added to the solid lubricant.

The polymer compound used here may be any compound that can be mixed with a solid lubricant, and particularly preferably a compound that can be mixed uniformly. Specific examples of the polymer compound include polyethylene, polypropylene, vinyl chloride, synthetic rubber such as butyl rubber and acrylic rubber, and natural rubber. However, its melting point is 80-25
0 ° C. is preferred. When the melting point of the polymer compound is low, fusion to the drill becomes remarkable, and the roughness of the inner wall of the hole tends to increase. In an extreme case, the drill may be broken. Further, if the melting point is too high, it is difficult to melt and the film tends to be difficult to form.
It is in the range of 00 ° C. Further, synthetic rubber or natural rubber having no melting point can be dissolved in a solvent or the like and mixed with a solid lubricating material, but the range of the thermal decomposition temperature is preferably from 150 to 400 ° C. If the thermal decomposition temperature is too low, the thermal stability is poor and production conditions such as film formation are extremely limited. On the other hand, if the thermal decomposition temperature is too high, it may cause a problem in drilling during drilling, which lowers the dischargeability of chips and deteriorates hole quality. A more preferred range is 200 to 350 ° C.

The method of mixing the solid lubricant with the polymer compound includes melting, dissolving with a solvent, and the like, but is not limited thereto.

The amount of the solid lubricant to be added is preferably 10 to 60 parts by weight based on 100 parts by weight of the polymer compound. If the amount of the solid lubricant used is too small, the lubricity of the drill decreases, the inner wall roughness of the hole increases, and the life of the drill is shortened. On the other hand, if the amount of the solid lubricant is too large, the flexibility of the mixture layer is reduced, which causes the adhesion to the aluminum foil to be reduced. A more preferred range is 20 to 50 parts by weight. The amount of lubricating oil to be added to the solid lubricant is 10
70 parts or less is preferable with respect to 0 parts. If the amount of the lubricating oil is too large, the cohesive force of the mixed polymer is reduced and the adhesion to the aluminum foil tends to be reduced. More preferably, it is 50 parts or less.

Further, the thickness of the mixture layer is 10 to 3
00 μm is preferred. When the thickness of the mixture layer is reduced, the effect of improving the lubricity of the drill tends to decrease. When the mixture layer is too thick, the displacement of the drill is caused, which may adversely affect the hole position accuracy. When a mixture layer is formed by coating, it is possible to form a mixture layer by one coating.
It is difficult to obtain a thickness of 0 μm or more, but if plastic particles are added to the mixture, a coating thickness of 50 μm or more can be easily obtained. More preferably 30 to 200
μm.

The plastic particles used here include:
Examples include, but are not limited to, particles of an acrylic resin such as polystyrene and polymethyl methacrylate, and a hollow plastic body. In addition, the particle diameter of the plastic particles is preferably 1 to 50 μm.
More preferably, it is 3 to 20 μm. If the particle size is too small, the dispersibility in a solid lubricant and a polymer compound tends to decrease.If the particle size is too large, it interferes with drilling, and has an adverse effect such as an increase in the inner wall roughness of the hole and a decrease in hole position accuracy. Tend to be different. The addition amount of the plastic particles is preferably 3 to 30 parts with respect to 100 parts of the solid lubricant. If the added amount of the plastic particles is small, the coating thickness cannot be obtained. More preferably 5-
20 parts.

The metal foil used in the present invention includes:
There are aluminum foil, copper foil and the like. By using metal foil,
There is an effect that it is possible to suppress burrs in a peripheral portion formed by drilling. The metal foil is preferably used in close contact with the laminate to be drilled.
The effect is greater as the thickness of the metal foil is larger, but the cost is higher. Similarly, the higher the hardness of the metal foil, the higher the effect of suppressing the burr height, and the hardness of the metal foil 5 is preferably equal to or higher than the hardness H10 specified in JIS H0001.

Examples of the material of the thermoplastic resin film used in the present invention include polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, and ethylene-vinyl acetate copolymer. Its melting point is preferably from 80 to 180 ° C. When the melting point is low, fusion to a drill tends to be conspicuous, and when the melting point is high, film formation tends to be difficult. The above-mentioned thermoplastic resin film may be subjected to an antistatic treatment, a corona treatment or the like, and may be a single layer or a multilayer film of two or more layers.

The laminated body punching sheet 13 according to the first embodiment is provided on the metal foil 5 with a mixture layer comprising a mixture of a solid lubricant and a polymer compound which can be mixed with the solid lubricant. 15 can be produced by laminating them. Examples of the method include extrusion lamination, coating of a solution or melt of the mixture on the metal foil 5, lamination of the metal foil and the mixture sheet, and the like.
However, it is not limited to this. However, the coating which can easily laminate the mixture layer 15 on the metal foil 5 is generally a coating dissolved in a solvent or the like, and a rubber component such as butyl rubber or acrylic rubber which can be easily dissolved in an organic solvent. It is more advantageous to use As the organic solvent, general-purpose solvents such as toluene, MEK, and ethyl acetate are used.

The sheet 23 or 27 for punching a laminate according to the second or third embodiment has a mixture layer 15 formed on one or both sides of a thermoplastic resin film 21. Can be produced by bonding together. At this time, an extrusion lamination for directly extruding a mixture of the molten solid lubricant onto the metal foil 5 and a polymer capable of being uniformly mixed onto the metal foil, a method of applying an adhesive to a lubricant sheet or a metal foil and applying an adhesive thereto. Lamination, and a method such as heat fusion lamination in which the lubricant sheet is melted and bonded by heating, etc., are exemplified, but not limited thereto.

The laminated body punching sheet 28 according to the fourth embodiment can be formed by laminating the thermoplastic resin film 21, the mixture layer 15, and the metal foil 5, and is similar to the above method. It can be produced by a method, but is not limited thereto.

An object to be drilled using the processed sheet in the present invention is a laminate of a metal foil and an insulator. More specifically, an object to be drilled is a printed wiring board, which is not particularly limited, but a multilayer board having two or more layers is particularly suitable. Drilling is mainly processing of through holes in the laminate. The drill used at this time is not particularly limited. In the drilling process using the processed sheet in the present invention, at high rotation, the diameter of 0.1 ~
Even a drill for drilling holes as small as 1.0 mm can be suitably drilled. The processed sheet in the present invention,
At the time of drilling, it is preferable to laminate the metal foil surface to the laminate to be processed, and further to the thermoplastic resin film surface toward the entry side of the drill. It is preferable that a backup board is placed on the lowermost layer and the four corners are temporarily fixed using an adhesive tape or the like. The equipment is NC
It is a general processing method to perform drilling using a processing machine. In the present invention, by arranging lubricating oil on the front or back surface of the object to be drilled and performing drilling with a drill or the like, smear can be eliminated and wall roughness inside the hole can be reduced. In order to arrange the lubricating oil, the above-mentioned processed sheet may be interposed, and other lubricating oil or a base material impregnated with the lubricating oil or a mixture of the thermoplastic resin or the solid lubricant (the base material may be polyester fiber, glass (A woven or nonwoven fabric such as fiber) may be interposed, or a sheet or the like in which the base material and the metal foil are bonded via a thermoplastic resin film may be interposed.

[0031]

EXAMPLES Hereinafter, first to third embodiments of the present invention will be described based on examples, but the present invention is not limited to these examples.

(Example 1) In accordance with the first embodiment, 100 parts by weight of SEBS-based adhesive G-1657 (manufactured by Shell Chemical) and 30 parts by weight of solid paraffin WSSEN-8 (manufactured by Nippon Seiro) Was adjusted to a concentration of 50% with toluene, and the thickness of the aluminum foil 5 having a hardness of H18 was 100 μm.
(Sumite Light Metal Co., Ltd.) was used as a sample.

This was laminated on a laminate of three copper-clad laminates of four layers with the surface of the aluminum foil facing, and a paper phenol plate 17 was laminated on the bottom. Further, using a drill 11 having a diameter of 0.3 mm, 60 krpm, 1.8 m / min, 30 μm
Drilling 4000 holes under the condition of / rev
For the 20 holes from 1 to 4000 shots, the presence or absence of smear, hole position accuracy, and hole wall roughness of the uppermost multilayer plate hole were observed. Table 1 shows the results.

Example 2 This example relates to the second embodiment, in which 100 parts by weight of SEBS-based adhesive G-1657 (manufactured by Shell Chemical), solid paraffin, WELSSEN-
8 (manufactured by Nippon Seiro Co., Ltd.) was prepared to a concentration of 50% with toluene, dried on one side of a 50 μm PET film (manufactured by Teijin) and then coated with a 50 μm coating thickness on one side with an acrylic adhesive. A sheet 19 for punching was prepared by laminating an aluminum foil having a hardness of H18 and a thickness of 100 μm (manufactured by Sumitomo Light Metal Co., Ltd.) to which an agent SK-Dyne 1498B (manufactured by Soken Chemical) was applied at a thickness of 10 μm. Others were tested similarly to Example 1. Table 1 shows the results.

(Example 3) According to the fourth embodiment, crosslinked acrylic particles MR-20G (manufactured by Soken Chemical) were mixed with a mixture of SEBS-based adhesive and solid paraffin.
0 parts were added. Others were tested similarly to Example 1. Table 1 shows the results.

Example 4 The amount of solid paraffin added was 1
The test was conducted in the same manner as in Example 1 except that the amount was 5 parts by weight. Table 1 shows the results.

Example 5 The amount of solid paraffin added was 4
The test was conducted in the same manner as in Example 1 except that the amount was 5 parts by weight. Table 1 shows the results.

Example 6 The amount of solid paraffin added was 1
The test was conducted in the same manner as in Example 2 except that the amount was 5 parts by weight. Table 1 shows the results.

Example 7 The amount of solid paraffin added was 4
The test was conducted in the same manner as in Example 2 except that the amount was 5 parts by weight. Table 1 shows the results.

Example 8 The amount of solid paraffin added was 1
The test was conducted in the same manner as in Example 3 except that the amount was 5 parts by weight. Table 1 shows the results.

Example 9 The amount of solid paraffin added was 4
The test was conducted in the same manner as in Example 3 except that the amount was 5 parts by weight. Table 1 shows the results.

Comparative Example 1 The amount of solid paraffin added was 0
The test was performed in the same manner as in Example 1 except that the weight was used. Table 1 shows the results.

[0043]

[Table 1] (Note 1) Smear presence ○: No smear ×: Smear present (Note 2) Average hole position accuracy of 3981 to 4000 shots (μm) (Note 3) Maximum roughness of inner wall of hole of 3981 to 4000 shots (μm) As shown in Table 1, in Examples 1 to 9, smear did not occur, and hole position accuracy and hole wall roughness were good. On the other hand, in Comparative Example 1, since the amount of solid paraffin added was small, the effect of increasing the slip of the drill 11 was reduced, and the roughness of the hole wall was increased.

The present invention is not limited to the above-described embodiment, but can be embodied in other forms by making appropriate changes.

[0045]

According to the present invention, the diameter at the time of manufacturing a laminate is 0.1 mm to 1.0 mm.
In the step of drilling a small-diameter hole such as mm, the hole is drilled using the laminated body drilling sheet according to any one of claims 1 to 9 of the present invention, so that smear does not occur and burrs do not occur. , And a high-quality laminate having a small hole wall roughness can be obtained. In addition, there is an effect of preventing breakage of the drill and extending the life.

According to the first or second aspect of the present invention, the mixture of the solid lubricant and the polymer compound can be melted at the time of processing to improve the lubricity of the drill, and the metal foil is used in close contact with the laminate. Burrs during drilling can be suppressed by the metal foil.

According to the third aspect of the present invention, the lubricating property of the solid lubricant can be further improved by the high molecular compound of the rubber component.

According to the seventh aspect of the present invention, by adding plastic particles, the thickness of the mixture can be increased, so that the lubricity of the drill can be improved. In addition, since the particle diameter of the plastic particles is 1 to 100 μm, it does not hinder drilling, and does not adversely affect the inner wall roughness of the hole or the hole position accuracy.

According to the eighth aspect of the present invention, since the thickness of the metal foil is 50 to 200 μm, burrs at the peripheral portion where the hole is formed can be suppressed at low cost.

According to the ninth aspect of the present invention, since the hardness of the metal foil is H10 or more, the burr height at the time of drilling can be suppressed.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a laminated body drilling sheet according to a first embodiment of the present invention, and FIG. 1B is a drilling method using the laminated body drilling sheet of FIG. FIG.

FIG. 2 (A) is a cross-sectional view of a laminated body drilling sheet according to a second embodiment of the present invention, and FIG. 2 (B) is a drilling method using the laminated body drilling sheet of (A). FIG.

FIG. 3A is a cross-sectional view of a laminated body drilling sheet according to a third embodiment of the present invention, and FIG. 3B is a drilling method using the laminated body drilling sheet of FIG. FIG.

FIG. 4A is a cross-sectional view of a laminated body drilling sheet according to a fourth embodiment of the present invention, and FIG. 4B is a drilling method using the laminated body drilling sheet of FIG. FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 Laminate drilling sheet 3 Thermoplastic resin film 5 Metal foil [aluminum foil] 7 Adhesive 9 Laminate (of first embodiment) 11 Drill 13 Laminate (of second embodiment) 15 Mixture Layer (of solid lubricant [solid paraffin] and polymer compound) 17 Paper phenol board 19 Laminate (of the third embodiment) 21 Thermoplastic resin film 23, 27, 28 Sheet 25 Laminate (fourth embodiment) 29 printed wiring board

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Atsushi Inoue 1150 Goshomiya, Odate, Shimodate-shi, Ibaraki F-term in Goshomiya Office, Hitachi Chemical Co., Ltd. 3C060 BA05 BG01 4F100 AB01B AB10 AB33B AK01A AK01C AK01D AK25G AK42 AK80 AN00A AN00D BA02 BA04 BA07 BA10B BA10D CA19A CA19D DE01A DE01D GB43 JB16C JK12B JL01 YY00A YY00B YY00D

Claims (9)

[Claims] 1. A sheet for drilling a laminated body, comprising a mixture of a solid lubricant and a polymer compound that can be mixed with the solid lubricant, laminated on one surface of a metal foil. 2. A method in which a sheet in which a mixture of a solid lubricant and a polymer compound which can be uniformly mixed with the solid lubricant is laminated on one or both sides of a thermoplastic resin film is bonded to one side of a metal foil. Characteristic sheet for drilling laminates. 3. The sheet for drilling a laminate according to claim 2, wherein a mixture of a solid lubricant and a polymer compound that can be uniformly mixed with the solid lubricant, a thermoplastic resin film, and a metal foil are laminated in this order. 4. A mixture of a solid lubricant and a polymer compound that can be uniformly mixed with the solid lubricant, a thermoplastic resin film, a solid lubricant, a mixture with a polymer compound that can be uniformly mixed with the solid lubricant, and a metal. The sheet for drilling a laminate according to claim 2, wherein the sheet is laminated in the order of foil. 5. The laminated body perforating sheet according to claim 2, wherein a thermoplastic resin film, a solid lubricant, and a mixture of a polymer compound capable of being uniformly mixed with the solid lubricant and a metal foil are laminated in this order. 6. The sheet according to claim 2, wherein the polymer compound is a rubber component. 7. The sheet according to claim 1, wherein plastic particles having a particle size of 1 to 100 μm are added to the mixture. 8. The sheet according to claim 1, wherein the thickness of the metal foil is 50 to 200 μm. 9. The sheet according to claim 1, wherein the metal foil has a hardness of H10 or more.