PRODUCTION OF LAMINATED SHEET

PURPOSE: To enhance punching processability and the level of dimensional change/warpage without lowering electric capacity characteristics and other various characteristics by superposing two prepregs so that the coating surfaces of them become inside and arranging metal foil on at least the single surface thereof and molding the whole under heating and pressure. CONSTITUTION: Both surfaces of a long base material are coated with thermosetting resin varnish by respectively using a coater 3 and a roll coater 4. Thereafter, the coated base material is passed through a dryer 5 to be heated and dried to obtain a thermosetting resin impregnated prepreg which is, in turn, cut into predetermined length by a cutter 6. Two prepregs thus obtained are superposed one upon another so that the surfaces coated with the inorg. filler- containing varnish of them become inside to be molded under heating and pressure. By this constitution, a laminated sheet lowered in warpage characteristics, dimensional change and bidirectional thermal expansion and not generating the lowering of moisture absorbing insulating properties and excellent in punching processability and cost reduction is obtained.