ELEMENT OF PRELIMINARY BILLETS, PRELIMINARY BILLETS USING IT, AND METHOD FOR OBTAINING PRELIMINARY BARRELS

摘要

This preform element is characterized by having a tucked portion in at least a portion of a prepreg composed of a reinforced fiber and a thermosetting resin. Provided are a preform element, a preform using the same, and a method for producing the same, wherein the preform element has excellent mechanical properties or filling characteristics with respect to a cavity and is effective in avoiding problems, such as fiber bridging or resin richness or warping, even when a three-dimensional form having thickness variations such as thick parts or projections is obtained through a press molding.