Back-up material and method for drilling printed circuit boards

Details Back-up material and method for drilling printed circuit boards Back-up material and method for drilling printed circuit boards

H - Electricity

05

K

H05K 3/00 (2006.01) B23B 35/00 (2006.01)

Patent

CA 2146278

A back-up board for use in drilling holes in printed circuit boards is disclosed. The inventive back-up board comprises outer layers of paper impregnated with a high-density resin, and a core consisting of alternating layers of paper impregnated with low-density resin and dry paper.

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