JPS6431916A - Method for drying reinforced cylindrical fiber preformed body - Google Patents

Abstract

PURPOSE:To drastically shorten drying time of a fiber preformed body by reducing pressure in inner peripheral zone of the fiber preformed body composing of permeable cylindrical forming die and reinforcing fiber and flowing through hot blast from high pressure zone to low pressure zone. CONSTITUTION:The fiber preformed body 1 composing the permeable cylindrical forming die 2 and the reinforcing fiber is stood on a supporting table 23 with a holder 32 upward, and the branch pipe 25 is positioned in the forming die 2. Current is conducted to a heater 20 and a fan 22 is rotated to heat air from an inlet 18 with a heater 20 and the developed hot blast (about 100 deg.C) is blown toward each preformed body 1 from outlet 19. On the other hand, a blower 28 is driven and the suction action is given in each forming die 2 through suction pipe 24. By this method, the pressure in the inner peripheral zone in the forming die 2 is reduced to make the reduced pressure zone and outer peripheral zone of the preformed body 1 is made to high pressure zone. As a result, the hot blast is flowed through from the hot pressure zone to the low pressure zone and dry of the forming body 1 is executed and uneven distribution of inorganic binder combining the fibers as bundle-state is prevented. By this method, the permeability of the forming body 1 is held to high and the drying time is shortened.