Abstract
Glass fiber reinforced plastics are used as important industrial materials. Generally the role of GF is a reinforcement of plastics.But recently new concept is suggested that the GF itself to be a structural element. The injection expanded molding is an example.It combines spring-back force of long fiber and core-back technology at injection mold to get the light and rigidity structure.In this paper mechanical properties and the structure of the injection expanded mold of GFPP are investigated.The structure of expanded mold consists of an unexpended layer of surface and an expanded layer inside.This expanded mold has higher rigidity than rib structure with high impact strength.The new method that fiber is used for the structure element of mold is confirmed to be useful.
