| 摘要 |
PURPOSE:To obtain a molded item with high elastic modulus even when the thickness of the molded item is thicker than usual by a method wherein one kind or more of polymer, at least one kin of which is thermotropic polymer, are continuously composite-injection-molded in multilayers from the respective injection units of an injection molder having two or more injection units. CONSTITUTION:Multilayer composite-injection-molded items with various cross- sectional shapes are obtained by composite-injection-molding one kind or more of polymers in multilayers with an injection molder having two or more injection units. The thermotropic polymer used is a main chain type thermotropic polymer such as thermotropic polyester or the like. The higher the elastic modulus of thermotropic polyester, the better. The multilayer composite molded item in concern consists of only thermotropic polymers in same kind or in different kinds having the thickness of one layer of 0.2mm or more. By composite- molding, such as sandwich-molding, those thermotropic polymers in multilayers, the elastic modulus of the multilayer molded item can be nearly equal to that of a single layer molded item. |
