| 摘要 |
<p>PURPOSE:To reduce air bubbles in a laminated sheet as much as possible by a method wherein a predetermined number of sheet-like base materials are superposed one upon another while continuously transferring to form a superposed base material which is, in turn, coated and impregnated with a solventless liquid thermosetting resin and sheet-like metal foils or release film are superposed on both surfaces of the superposed base material to form a laminated sheet main body. CONSTITUTION:Sheet-like base materials 1 are superposed one upon another by a pair of laminating rolls 2 while continuously transferred to form a superposed base material (a). Copper foils 6 are superposed on both surfaces of the superposed base material (a) as sheet-like metal foils to form a laminated sheet main body (b). Next, a resin composition 4 prepared by mixing aluminum hydroxide and a curing agent with a thermosetting polyester resin is applied to and infiltrated in the superposed base material (a) by a kiss-roll 3. At this time, resin content is set to 80%. Thereafter, the copper foils 6 and release sheets are superposed on the surfaces of the superposed base material (a) by a laminating roll 5 to form a laminated sheet main body (b) which is, in turn, molded and cured in a curing oven 11. By this method, air bubbles in the laminated sheet is reduced as much as possible and quality is enhanced.</p> |
