Patent ID: 7735219
Filing Date: 2010-06-15
Classification: H05K,Y10T

Abstract:
1. A method for machining a board, comprising: forming a backup board: supporting the board by the backup board; and machining the board while the board is supported by the backup board, wherein the backup board has a fibrous layer and a surface layer formed on one side of the fibrous layer, the surface layer being in contact with the board during said supporting the board and said machining the board, and wherein said forming the backup board includes: forming an impregnated fibrous mat by impregnating a thermosetting adhesive into a fibrous mat of the kenaf fibers, the kenaf fibers being adhered together by the thermosetting adhesive and having an average length of about 10-200 mm and an average diameter of about 10-300 μm; forming the fibrous layer having a density of about 600-900 kg/m forming a resin paper by impregnating a thermosetting resin into a paper; and forming the surface layer on said one side of the fibrous layer by curing the resin paper.