Process for manufacturing prepregs for use as electric insulating material

摘要

In a process for manufacturing a prepreg for use as an electrically insulating material, a main epoxy resin composition and a subsidiary resin composition containing a hardener which have been separately filtered and metered are quickly mixed into a mixture resin composition, a reinforcing member (1) is coated with a uniformly thin film of the mixture resin composition by a die coater (7) under specific temperature, average residence time and low shear conditions, the coated reinforcing member is heated in non-contact manner by an infrared ray heater (9) to have the member impregnated with the resin composition of the film, the member is further heated in non-contact manner by a floating dryer (10) to have the resin composition semi-hardened, and the member is unified through compaction rolls (11,11',15,15'), whereby the prepreg in the form of a sheet-shaped fiber reinforced composite material (B) is continuously manufactured.