CONTINUOUS PRODUCTION OF BOARD FOR FLEXIBLE PRINTED WIRING BOARD

摘要

PURPOSE:To inexpensively prepare a flexible metal foil clad laminated sheet excellent in thickness accuracy, soldering heat resistance and dimensional stability by a continuous lamination method by continuously applying a release agent to the contact surface with an impregnated base material of an air shielding film on the spot before laminating the air shielding film to the impregnated base material. CONSTITUTION:The long base material unwound from a reel 1 is passed through a dryer 2 if necessary to be dried and continuously impregnated with a radical curable resin solution after drying by a resin impregnating coater 3. The uncured laminate 10 is successively guided to a heating furnace 7 to be usually heated to 70-150 deg.C. As a catalyst, org. peroxide is used. Next, the laminated sheet 11 is continuously taken up by a taking-up machine 8 to be taken up by a product winder 9. When a reel 4 is a film-like air shielding body, the laminated sheet is peeled off from the product by the taking-up machine 8 to be taken up by a winder 12. When a metal foil 5 is laminated to a single surface and an air shielding film 4 is laminated to the other surface, a solution of a silicone release agent is applied to the contact surface with the base material of the air shielding film unwound from the reel 4 by a gravure coater 14 and the coated one is passed through a drying zone 15 to remove a solvent. The air shielding film taken up by the winder 12 is supplied to the reel 4 and the release agent is applied to said film to repeatedly use the film.