JP4175681B2 - Entry board for drilling - Google Patents
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- JP4175681B2 JP4175681B2 JP23643097A JP23643097A JP4175681B2 JP 4175681 B2 JP4175681 B2 JP 4175681B2 JP 23643097 A JP23643097 A JP 23643097A JP 23643097 A JP23643097 A JP 23643097A JP 4175681 B2 JP4175681 B2 JP 4175681B2
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- drilling
- lubricant
- entry board
- copper foil
- phenol resin
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- Laminated Bodies (AREA)
Description
【０００１】
【産業上の利用分野】
この発明はプリント配線板を製造する際の、プリント配線板用基板にドリル穴明け加工を行う工程において、治具板として使用されるエントリーボードに関するものである。
【０００２】
【従来技術】
プリント配線板用基板にドリル穴明け加工を行う場合に、一般に、次のｉ〜ｖのことが要求される。
（ｉ）穴明けされるプリント配線板用基板の表面（ドリル穴明け部以外の表面）に傷を生じさせないこと。
（ｉｉ）ドリル穴明けにおける位置精度が良いこと。
（ｉｉｉ）ドリル加工穴縁部に反り上がりや銅箔バリがないこと。
（ｉｖ）ドリル加工穴内壁面が平滑であること。
（ｖ）ドリルの耐久性を損しないこと。
【０００３】
上記（ｉ）〜（ｖ）の要求に対し、一般に、バックアップボードと共にエントリーボードを使用してドリル穴明け加工が行われている。
プリント配線板用基板にドリル穴明け加工を行う際に用いられるエントリーボードとして、例えば常温固形の水溶性潤滑剤を多孔質基材（例えば紙基材）に含浸した潤滑剤入りシート（以後単に、従来例１と云う）がある（例えば米国特許明細書第４，７８１，４９５号参照）。また、常温固形の水溶性潤滑剤を単独で用いた潤滑剤シート（以後単に、従来例２と云う）がある（例えば特開平０４−９２４８８号公報、特開平０７−９６４９９公報参照）。更にまた、常温固形の水溶性潤滑剤シートを金属箔の片面に貼り合わせた複合シート（以後単に、従来例３と云う）がある（例えば特開平０４−９２４８８号公報、特開平０８−１５５８９６号公報参照）。
【０００４】
【従来技術の問題点】
▲１▼ 従来例１の潤滑剤入りシートは、その製作が比較的容易であり、ドリル加工穴内壁面が平滑化し、潤滑剤がドリル加工穴内壁面等に付着し（スミア発生し）ても、その潤滑剤スミアはメッキ処理工程の前工程である水洗により容易に除去できる等の長所を有するが、ドリル加工穴縁部の銅箔バリ抑制効果に欠ける問題点がある。
またこの潤滑剤入りシートはその保形性に乏しくドリル穴明け加工するプリント配線板用基板の上に積み重ねる作業の取扱い性が悪く、その作業の自動化が困難であると云う問題点もある。
▲２▼ 従来例２の潤滑剤シートは、その製作が比較的容易であり、ドリル加工穴内壁面が平滑化し、潤滑剤がドリル加工穴内壁面等に付着し（スミア発生し）ても、その潤滑剤スミアはメッキ処理工程の前工程である水洗により容易に除去できる等の長所があるが、ドリル加工穴縁部の銅箔バリ抑制作用に欠けると云う問題点がある。
またこの潤滑剤シートはその保形性に乏しくドリル穴明け加工されるプリント配線板用基板の上に積み重ねる作業の取扱い性が悪く、その作業の自動化が困難であると云う問題点もある。
▲３▼ 従来例３の複合シートは、その製作が比較的容易であり、ドリル加工穴縁部の銅箔バリの発生を抑制し、ドリル加工穴内壁面を平滑化し、潤滑剤がドリル加工穴内壁面等に付着し（スミア発生し）ても、その潤滑剤スミアをメッキ処理工程の前工程である水洗により容易に除去できる等の長所がある。
しかしながら、この複合シートは、金属箔の厚みとして少なくとも銅箔バリを抑制するに必要な程度の厚みにすることが必要であるが、この程度の金属箔の厚みでは複合シートとしてその保形性に乏しくドリル穴明けされるプリント配線板用基板の上に積み重ねる作業の取扱い性に欠け、その作業の自動化が困難であると云う問題点もある。仮に、複合シートの保形性を確保するために金属箔の厚みを銅箔バリを抑制するに必要な程度の厚み以上に設定すると、金属箔材料コストが上昇し、ドリルの切刃の摩耗が大になると云う問題が生じる。
【０００５】
【問題点を解決するための手段】
この発明のドリル加工用エントリーボードは、上記問題点を解決するために、請求項１記載の加工用エントリーボード（以後単に第一発明と云う。）は、滑剤を分散させたワニス状フェノール樹脂を紙基材に塗布含浸し、これを乾燥したプリプレグシート適宜枚数を重ね合せし、全体を加熱加圧成形するようにしたものである。潤滑剤として、高級アルコール又はその誘導体が挙げられる。高級アルコールとしては、例えば炭素数６個以上のステアリン酸・コハク酸などの高級脂肪酸、ステアリン酸鉛、ステアリン酸亜鉛などの高級脂肪酸と金属の塩である金属石鹸、ワックス等が挙げられる。高級アルコール誘導体としては、ポリエチレングリコール・ポリグリセロールなどを用いることができる。潤滑剤の使用量は、フェノール樹脂固形分１００部に対して５〜１００部の範囲であり、これを分散させて用いる。それは、潤滑剤の使用量がフェノール樹脂固形分１００部に対して５部以下になると潤滑効果に欠けてドリル穴内壁面を平滑にできなくなると共に、ドリル先端の切刃部の摩耗が大となるためであり、また潤滑剤の使用量がフェノール樹脂固形分１００部に対して１００部以上になると、フェノール樹脂の架橋密度が下がって、加熱加圧成形してもその成形品が保形性に欠けるものになり、ドリルの直進保持性が失われてドリル穴位置精度が悪くなると共に、ドリル穴縁部の銅箔バリの発生を抑えるための表面の硬度が足りなくなるためである。請求項２記載のドリル加工用エントリーボード（以後単に第二発明と云う。）は、潤滑剤を分散させたワニス状フェノール樹脂を紙基材に塗布含浸し、これを乾燥したプリプレグシート適宜枚数を重ね合せ更にその上に銅箔を積み重ねて、全体を加熱加圧成形するようにしたものである。換言すれば、請求項２記載の第二発明は、第一発明のドリル加工用エントリーボードの片面に銅箔を張り合わせた構成にしたものであると云うことができます。張り合わされた銅箔自身の表面硬度によりドリル穴縁部の反り上がりや銅箔バリの発生を抑える力が第一発明のドリル穴縁部の反り上がりや銅箔バリを抑える力より大になる。銅箔として、その厚みが１０〜５０μｍの範囲にあり且つ外側に位置する側の面の表面粗さが０．３μｍＲａ（ＪＩＳ−Ｂ−０６０１に基づく算術平均粗さを云う）以下のものを好敵に用いることができる。それは、張り合わされる銅箔の厚みが１０μｍ以下で且つ銅箔の外側面の表面粗さが０．３μｍＲａ以上になると、ドリル穴縁部の銅箔バリの発生を抑制する作用に欠けるようになり、また銅箔の厚みが５０μｍ以上になると、ドリルへの負荷が大になりドリルの摩耗が大になるためである。
【０００６】
【作用】
この第一発明、第二発明のドリル加工用エントリーボードは、潤滑剤がフェノール樹脂中に分散含有したワニスを紙基材に塗布含浸させた状態で、加熱加圧によりフェノール樹脂を反応させて全体を一体化したものであるから、このドリル加工用エントリーボードの切り粉の中の潤滑剤成分がドリルの穿孔による摩擦熱により反応固化したフェノール樹脂中から溶出してドリルの回転を潤滑化させてドリル穴内壁面を平滑化するように作用する。
またドリル加工用エントリーボードのプリント配線板用基板と接する面は、潤滑剤がフェノール樹脂中に分散含有したワニスを紙基材に塗布含浸させた状態で、加熱加圧によりフェノール樹脂を反応させて成形しながら固化して全体を一体化させた面であるから、この表面の硬度により銅箔バリの発生を抑制する作用を生じるものである。
【０００７】
【発明の効果】
この発明のドリル加工用エントリーボードは次の効果を奏す。
（１）潤滑剤を使用したドリル加工用エントリーボードであるが、保形性を有し、潤滑剤を用いない従来のドリル加工用エントリーボードの紙基材フェノール樹脂積層板と同様の扱い方をすることができるので、扱い方に利便性がある。
（２）第一発明のドリル加工用エントリーボードは、その切り粉が、従来例１の切り粉のように潤滑剤に紙成分を含んだ粉体ではなく、また従来例２の切り粉のように潤滑剤単独の粉体ではなく、潤滑剤がフェノール樹脂中に均一に分散された混合物に紙成分が含まれた成形物の粉体となるのであって、ドリル穴明け加工時に発生する切り粉の中の潤滑剤成分がドリルに付着することが極めて少なくなり、従来例１や従来例２のようにプリント配線板用基板のドリルの切り粉の排出に悪影響を及ぼさないものとなる。
（３）第一発明のドリル加工用エントリーボードのドリル穴明け加工されるプリント配線板用基板と接する面が、潤滑剤を分散させたワニス状フェノール樹脂を紙基材に塗布含浸し、これを乾燥したプリプレグシート適宜枚数を重ね合せし、全体を加熱加圧成形しながらフェノール樹脂を反応させて固化させた成形面であるから、その表面は平滑な面であり且つ或る程度の硬さを有するものであり、従ってドリル穴縁部の反り上がりと銅箔バリの発生を抑制する効果を生じる。
（４）第二の発明は、第一の発明の上記（１），（２）の効果に加えて、銅箔を張り合わせたことにより、銅箔自身の硬度（バーコール硬さ６５）が作用して上記（３）の銅箔バリ発生の抑制作用がより大になると云う効果を生じる。
（５）第一発明、第二の発明のドリル加工用エントリーボードは、紙基材フェノール樹脂積層板に潤滑剤を分散含有させたことにより、反りが少なくなる効果を生じる。
以下この発明を実施例・比較例を用いて具体的に説明する。
【０００８】
【実施例１】
ポリエチレングリコールをフェノール樹脂固型分１００部に対し５部分散させた、固型分５０％のワニス状フェノール樹脂を坪量２００ｇ／ｍ２のクラフト紙に塗布し、これを乾燥させ樹脂比率４０％のプリプレグシートを得た。
このプリプレグシート２枚を重ね合わせ、温度１５０℃・圧力８０ｋｇ／ｃｍ２・時間６０分の条件で加熱加圧成形して、０．４ｍｍ厚のドリル加工用エントリーボードを得た。
このドリル加工用エントリーボードの表面硬度をＪＩＳ−Ｋ−６９１１熱硬化性プラスチックス一般試験方法の５．１６．２項に準拠して試験し、その結果を表１に示した。
次に、厚み０．２ｍｍのＦＲ−４プリント配線板用基板を４枚積み重ねた上に、このドリル加工用エントリーボードを重ね合わせて用い、直径０．３ｍｍφのドリルにより回転数７０，０００ｒｐｍで２０００ショット穴明け加工して、１９８１ショットから２０００ショットまでの間のドリル加工穴の銅箔バリ量を４００倍の顕微鏡観察により調べ、穴壁面の粗さをＪＩＳ−Ｃ−５０１２プリント配線板試験方法の６．２項に準拠して、最大粗さの平均値及び最大粗さの最大値を調べ、更にドリル先端の切刃部の摩耗の程度を４００倍の顕微鏡観察により調べて、その結果を表１に示した。
【０００９】
【実施例２】
ポリエチレングリコールをフェノール樹脂固型分に対し１００部分散させた以外は実施例１と同様の方法でドリル加工用エントリーボードを得た。
このドリル加工用エントリーボードの表面硬度を実施例１と同様の方法で試験し、その結果を表１に示した。
次に、このドリル加工用エントリーボードを用いて実施例１と同様に加工穴の銅箔バリ量、穴内壁面の最大粗さ、及びドリル先端の切刃部の摩耗を調べ、その結果を表１に示した。
【００１０】
【実施例３】
実施例１で用いたプリプレグを２枚重ね合わせ、更にその上に、表面粗さＲａ０．３μｍで厚さ１８μｍの銅箔を積み重ね、これを温度１５０℃圧力８０ｋｇ／ｃｍ２で６０分間加熱加圧成形して、０．４ｍｍ厚のドリル加工用エントリーボードを得た。
このドリル加工用エントリーボードの表面硬度を実施例１と同様の方法で試験し、その結果を表１に示した。
次に、このドリル加工用エントリーボードを用いて実施例１と同様に加工穴の銅箔バリ量、穴内壁面の最大粗さ、及びドリル先端の切刃部の摩耗を調べ、その結果を表１に示した。
【００１１】
【比較例１】
ポリエチレングリコールがフェノール樹脂固型分に対し０部である以外は実施例１と同様の方法でドリル加工用エントリーボードを得た。
このドリル加工用エントリーボードの表面硬度を実施例１と同様の方法で試験し、その結果を表１に示した。
次に、このドリル加工用エントリーボードを用いて実施例１と同様に加工穴の銅箔バリ量、穴内壁面の最大粗さ、及びドリル先端の切刃部の摩耗を調べ、その結果を表１に示した。
【００１２】
【比較例２】
ポリエチレングリコール５０％の水溶液を坪量２００ｇ／ｍ２のクラフト紙を２枚重ねを用いて塗布含浸し、これを乾燥させ樹脂比率４０％のドリル加工用エントリーボードを得た。
このドリル加工用エントリーボードの表面硬度を実施例１と同様の方法で試験し、その結果を表１に示した。
次に、このドリル加工用エントリーボードを用いて実施例１と同様に加工穴の銅箔バリ量、穴内壁面の最大粗さ、及びドリル先端の切刃部の摩耗を調べ、その結果を表１に示した。
【００１３】
表１によれは、この発明のドリル加工用エントリーボードは、銅箔バリの発生が少なく、ドリル加工穴内壁面の平滑性に優れ、ドリルの切刃の耐摩耗性に優れるドリル穴明け加工ができることが解る。[0001]
[Industrial application fields]
The present invention relates to an entry board used as a jig plate in a process of drilling a printed wiring board substrate when manufacturing a printed wiring board.
[0002]
[Prior art]
When drilling a printed wiring board substrate, the following i to v are generally required.
(I) Do not cause scratches on the surface of the printed wiring board substrate to be drilled (the surface other than the drilled portion).
(Ii) Good position accuracy in drilling.
(Iii) Drilled hole edges should not be warped or have copper foil burrs.
(Iv) The drilled hole inner wall surface is smooth.
(V) Do not impair the durability of the drill.
[0003]
In response to the above requirements (i) to (v), drilling is generally performed using an entry board together with a backup board.
As an entry board used when drilling holes in a printed wiring board substrate, for example, a sheet containing a lubricant in which a porous base material (for example, a paper base material) is impregnated with a room-temperature solid water-soluble lubricant (hereinafter simply referred to as a board) (Refer to US Pat. No. 4,781,495, for example). Further, there is a lubricant sheet (hereinafter, simply referred to as Conventional Example 2) using a water-soluble lubricant that is solid at room temperature alone (see, for example, JP-A Nos. 04-92488 and 07-96499). Furthermore, there is a composite sheet (hereinafter simply referred to as Conventional Example 3) in which a room temperature solid water-soluble lubricant sheet is bonded to one side of a metal foil (for example, Japanese Patent Laid-Open Nos. 04-92488 and 08-155896). See the official gazette).
[0004]
[Problems of the prior art]
(1) The lubricant-containing sheet of Conventional Example 1 is relatively easy to manufacture, and even if the drilled hole inner wall surface is smoothed and the lubricant adheres to the drilled hole inner wall surface (smear), Lubricant smears have the advantage that they can be easily removed by washing with water, which is a pre-process of the plating process, but there is a problem that the effect of suppressing the copper foil burrs at the drilled hole edge is lacking.
In addition, this lubricant-containing sheet has a problem that its shape-retaining property is poor, the handling of the work to be stacked on the printed wiring board substrate to be drilled is poor, and the work is difficult to automate.
(2) The lubricant sheet of Conventional Example 2 is relatively easy to manufacture, and even if the drilled hole inner wall surface is smoothed and the lubricant adheres to the inner wall surface of the drilled hole (smear occurs), the lubrication is possible. The agent smear has an advantage that it can be easily removed by washing with water, which is a pre-process of the plating process, but there is a problem that the copper foil burr suppressing action at the drilled hole edge is lacking.
In addition, this lubricant sheet has a problem that it is difficult to automate the operation of stacking the printed sheet on a printed wiring board substrate to be drilled by poor shape retention.
(3) The composite sheet of Conventional Example 3 is relatively easy to manufacture, suppresses the occurrence of copper foil burrs at the edge of the drilled hole, smoothes the inner wall surface of the drilled hole, and the lubricant is the inner wall surface of the drilled hole. Even if it adheres to the surface (smear occurs), the lubricant smear can be easily removed by washing with water, which is a pre-process of the plating process.
However, the composite sheet needs to have at least a thickness necessary for suppressing copper foil burrs as the thickness of the metal foil. There is also a problem that the work to be stacked on the printed wiring board substrate that is poorly drilled is not easy to handle and it is difficult to automate the work. If the thickness of the metal foil is set to a thickness more than necessary to suppress the copper foil burrs in order to ensure the shape retention of the composite sheet, the metal foil material cost increases and wear of the cutting edge of the drill is reduced. The problem of becoming bigger arises.
[0005]
[Means for solving problems]
In order to solve the above problems, an entry board for drilling according to the present invention has a varnish-like phenol resin in which a lubricant is dispersed. A paper base material is coated and impregnated, and a suitable number of dried prepreg sheets are overlaid, and the whole is heated and pressed. As a lubricant, higher alcohols or their derivatives. As the higher alcohols, such as higher fatty acids such as C 6 or more stearic acid succinate, lead stearate, metal soap is a higher fatty acid and metal salts such as zinc stearate, wax. As the higher alcohol derivative, polyethylene glycol, polyglycerol or the like can be used. The amount of the lubricant used is in the range of 5 to 100 parts with respect to 100 parts of the phenol resin solid content, and is used by dispersing it. This is because when the amount of lubricant used is 5 parts or less with respect to 100 parts of phenol resin solid content, the lubrication effect is lacking and the inner wall surface of the drill hole cannot be smoothed, and the wear of the cutting edge part at the tip of the drill increases. In addition, when the amount of lubricant used is 100 parts or more with respect to 100 parts of the phenol resin solid content, the cross-linking density of the phenol resin is lowered, and the molded product lacks shape retention even when heated and pressed. This is because the straight-line holding property of the drill is lost and the accuracy of the drill hole position is deteriorated, and the hardness of the surface for suppressing the occurrence of copper foil burrs at the edge of the drill hole is insufficient. An entry board for drilling according to claim 2 (hereinafter simply referred to as a second invention) is obtained by applying and impregnating a paper base with a varnish-like phenol resin in which a lubricant is dispersed, and drying the prepreg sheet appropriately. In addition, a copper foil is further stacked thereon, and the whole is heated and pressed. In other words, it can be said that the second invention described in claim 2 has a structure in which the copper foil is laminated on one side of the entry board for drilling of the first invention. Due to the surface hardness of the bonded copper foil itself, the force to suppress the warpage of the drill hole edge and the generation of copper foil burrs is greater than the force to suppress the warpage of the drill hole edge and copper foil burrs of the first invention. A copper foil having a thickness in the range of 10 to 50 μm and a surface roughness on the outer side of 0.3 μm Ra (referring to arithmetic average roughness based on JIS-B-0601) or less is preferable. Can be used on enemies. That is, when the thickness of the copper foil to be bonded is 10 μm or less and the surface roughness of the outer surface of the copper foil is 0.3 μm Ra or more, the effect of suppressing the generation of copper foil burrs at the edge of the drill hole is lacking. In addition, when the thickness of the copper foil is 50 μm or more, the load on the drill is increased and the wear of the drill is increased.
[0006]
[Action]
The entry board for drilling of the first invention and the second invention is a whole in which the phenol resin is reacted by heating and pressurizing in a state in which the varnish in which the lubricant is dispersed and dispersed in the phenol resin is applied to the paper base material. As a result, the lubricant component in the chips of the drilling entry board elutes from the phenolic resin that has been reacted and solidified by frictional heat generated by drill drilling to lubricate the drill rotation. It acts to smooth the inner wall surface of the drill hole.
Also, the surface of the drilling entry board that contacts the printed wiring board substrate is made by reacting the phenolic resin with heat and pressure in a state where the varnish containing the lubricant dispersed in the phenolic resin is applied and impregnated on the paper base material. Since the surface is solidified while being molded and integrated as a whole, the hardness of this surface causes an effect of suppressing the occurrence of copper foil burrs.
[0007]
【The invention's effect】
The entry board for drilling according to the present invention has the following effects.
(1) Although it is a drilling entry board that uses a lubricant, it has the same shape-retaining property as the paper base phenolic resin laminate of a conventional drilling entry board that does not use a lubricant. Because it is possible, it is convenient to handle.
(2) In the entry board for drilling of the first invention, the swarf is not a powder containing a paper component in the lubricant as in the swarf of Conventional Example 1, but as in the swarf of Conventional Example 2. This is not a powder of lubricant alone, but a powder of a molded product containing a paper component in a mixture in which the lubricant is uniformly dispersed in a phenolic resin, and is generated during drilling. As a result, the lubricant component in the adhesive is extremely less likely to adhere to the drill, and unlike the conventional examples 1 and 2, it does not adversely affect the discharge of chips from the printed wiring board substrate.
(3) The surface contacting the printed wiring board substrate to be drilled of the entry board for drilling of the first invention is coated and impregnated with a varnish-like phenolic resin in which a lubricant is dispersed, Since the dried prepreg sheet is a molded surface obtained by superimposing a suitable number of sheets and reacting and solidifying the phenol resin while heating and pressing the whole, the surface is smooth and has a certain degree of hardness. Therefore, the effect of suppressing the warpage of the drill hole edge and the occurrence of copper foil burrs is produced.
(4) In the second invention, in addition to the effects (1) and (2) of the first invention, the hardness of the copper foil itself (Barcoal hardness 65) acts by bonding the copper foil. As a result, the effect of suppressing the occurrence of copper foil burrs in (3) becomes larger.
(5) The entry board for drilling of the first invention and the second invention has an effect of reducing warpage by dispersing the lubricant in the paper base phenolic resin laminate.
Hereinafter, the present invention will be specifically described with reference to examples and comparative examples.
[0008]
[Example 1]
A varnish-like phenolic resin having a solid content of 50%, in which 5 parts of polyethylene glycol is dispersed with respect to 100 parts of the phenolic resin solid content, is applied to kraft paper having a basis weight of 200 g / m 2 and dried to obtain a resin ratio of 40%. Prepreg sheet was obtained.
The two prepreg sheets were superposed and heated and pressed under conditions of a temperature of 150 ° C., a pressure of 80 kg / cm 2, and an hour of 60 minutes to obtain a 0.4 mm thick entry board for drilling.
The surface hardness of the entry board for drilling was tested in accordance with 5.16.2 of the general test method of JIS-K-6911 thermosetting plastics, and the results are shown in Table 1.
Next, four FR-4 printed wiring board substrates having a thickness of 0.2 mm were stacked and this entry board for drilling was used in an overlapping manner, and a drill with a diameter of 0.3 mmφ was used at a rotational speed of 70,000 rpm and 2000 Shot hole drilling, the copper foil burr amount of drilled holes between 1981 shots and 2000 shots was examined by microscopic observation at 400 times, and the roughness of the hole wall surface of the JIS-C-5012 printed wiring board test method In accordance with Section 6.2, the average value of the maximum roughness and the maximum value of the maximum roughness are examined, and the degree of wear of the cutting edge portion of the drill tip is examined by microscopic observation at 400 times, and the result is shown in the table. It was shown in 1.
[0009]
[Example 2]
An entry board for drilling was obtained in the same manner as in Example 1 except that 100 parts of polyethylene glycol was dispersed with respect to the phenol resin solid component.
The surface hardness of the drilling entry board was tested in the same manner as in Example 1, and the results are shown in Table 1.
Next, using this entry board for drilling, as in Example 1, the amount of copper foil burrs in the processed hole, the maximum roughness of the inner wall surface of the hole, and the wear of the cutting edge at the tip of the drill were examined. It was shown to.
[0010]
[Example 3]
Two prepregs used in Example 1 were stacked, and further a copper foil having a surface roughness Ra of 0.3 μm and a thickness of 18 μm was stacked thereon, and this was heated and pressed at a temperature of 150 ° C. and a pressure of 80 kg / cm 2 for 60 minutes. Molding was performed to obtain a 0.4 mm thick entry board for drilling.
The surface hardness of the drilling entry board was tested in the same manner as in Example 1, and the results are shown in Table 1.
Next, using this entry board for drilling, as in Example 1, the amount of copper foil burrs in the processed hole, the maximum roughness of the inner wall surface of the hole, and the wear of the cutting edge at the tip of the drill were examined. It was shown to.
[0011]
[Comparative Example 1]
An entry board for drilling was obtained in the same manner as in Example 1 except that polyethylene glycol was 0 part relative to the phenol resin solid component.
The surface hardness of the drilling entry board was tested in the same manner as in Example 1, and the results are shown in Table 1.
Next, using this entry board for drilling, as in Example 1, the amount of copper foil burrs in the processed hole, the maximum roughness of the inner wall surface of the hole, and the wear of the cutting edge at the tip of the drill were examined. It was shown to.
[0012]
[Comparative Example 2]
An aqueous solution of 50% polyethylene glycol was applied and impregnated with two kraft papers having a basis weight of 200 g / m 2 and dried to obtain an entry board for drilling with a resin ratio of 40%.
The surface hardness of the drilling entry board was tested in the same manner as in Example 1, and the results are shown in Table 1.
Next, using this entry board for drilling, as in Example 1, the amount of copper foil burrs in the processed hole, the maximum roughness of the inner wall surface of the hole, and the wear of the cutting edge at the tip of the drill were examined. It was shown to.
[0013]
According to Table 1, the entry board for drilling according to the present invention has less copper foil burrs, is excellent in the smoothness of the inner wall surface of the drilled hole, and can perform drilling with excellent wear resistance of the drill cutting edge. I understand.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23643097A JP4175681B2 (en) | 1996-09-21 | 1997-07-28 | Entry board for drilling |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8-285783 | 1996-09-21 | ||
| JP28578396 | 1996-09-21 | ||
| JP23643097A JP4175681B2 (en) | 1996-09-21 | 1997-07-28 | Entry board for drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10217199A JPH10217199A (en) | 1998-08-18 |
| JP4175681B2 true JP4175681B2 (en) | 2008-11-05 |
Family
ID=26532671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23643097A Expired - Lifetime JP4175681B2 (en) | 1996-09-21 | 1997-07-28 | Entry board for drilling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4175681B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103029169A (en) * | 2012-12-21 | 2013-04-10 | 深圳市柳鑫实业有限公司 | Novel cover plate for PCB (Printed Circuit Board) drilling and manufacturing method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4201462B2 (en) | 2000-06-05 | 2008-12-24 | 利昌工業株式会社 | Entry board for drilling |
| JP4551654B2 (en) * | 2003-12-09 | 2010-09-29 | 株式会社神戸製鋼所 | Resin-coated metal plate used for drilling printed circuit boards |
| TWI307308B (en) * | 2005-01-31 | 2009-03-11 | Ps Japan Corp | Material of backup board for drilling and cutting operation, and its molded product |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58110247A (en) * | 1981-12-25 | 1983-06-30 | 住友ベークライト株式会社 | Manufacture of laminated board |
| JPH04122506A (en) * | 1990-09-10 | 1992-04-23 | Nippon Kemu Tec Kk | Drilling presser plate and drilling method |
| JP3169026B2 (en) * | 1991-12-18 | 2001-05-21 | 三菱瓦斯化学株式会社 | Lubricating sheet for small holes |
| JPH08290396A (en) * | 1995-04-18 | 1996-11-05 | Risho Kogyo Co Ltd | Backup board for drilling |
-
1997
- 1997-07-28 JP JP23643097A patent/JP4175681B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103029169A (en) * | 2012-12-21 | 2013-04-10 | 深圳市柳鑫实业有限公司 | Novel cover plate for PCB (Printed Circuit Board) drilling and manufacturing method |
| CN103029169B (en) * | 2012-12-21 | 2016-01-20 | 深圳市柳鑫实业股份有限公司 | A kind of boring blind flange of PCB and manufacture method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10217199A (en) | 1998-08-18 |
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