PREPARATION OF LAMINATED SHEET

摘要

PURPOSE:To obtain excellent capacity by the uniform impregnation with a resin by superposing long striplike base materials each impregnated with resin varnish on the under surface side thereof one over another and arranging a metal foil to the upper and lower surfaces of the superposed one and laminating the obtained laminates to perform molding. CONSTITUTION:In the manufacturing of a laminated sheet used in electronic machinery, communication machinery or the like, a long strip like base material is subjected to the contact impregnation with resin varnish from the under surface and a required number of the obtained impregnated base materials are superposed one over another and a metal foil is arranged to the upper surface and/or lower surface of the superposed one to form a laminate while a required number of the laminates are continuously laminated and molded. As the long striplike base material, glass cloth or paper having high thickness control effect is desirable. As the resin varnish, an unsaturated polyester resin, a vinyl ester resin, a modified resin thereof and a mixture thereof are used. The resins used in primary and secondary impregnation processes may be same or different. A resin amount is 5-20wt.%, pref. 40-60wt.% as a whole in contact impregnation. As the metal foil, a single or composite foil composed of copper or aluminum is used. As a lamination molding method, a method capable of performing lamination molding continuously may be employed.