Apparatus and method for fabricating polycarbonate skylights

摘要: A method for molding a polycarbonate plastic sheet into skylight dome or the like. clamp frame is preheated to first temperature. thereafter clamped around its perimeter in and approximately The unclamped portion of heated about 300° by ovens soften forming. softened then subjected forming pair coacting peripheral molds form steps pushes immediately adjacent frames. vacuum drawn over center free-form dome. are separated formed article removed from frame. preheating heating prevents distortion flange area slylight step push areas