| 摘要 |
PROBLEM TO BE SOLVED: To improve warp of an entry board and a backup board by using an unsaturated polyester resin laminated board where uniform heating is performed and warp is negligible. SOLUTION: In this boring method, boring is performed by using a drill in the state that a laminated board which is composed of unsaturated polyester resin and paper and 0.1-2.0 mm in thickness is brought into closely contact with the surface of a copper clad laminated board.
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