A supply device for supplying a friction material to a conveyor provided in a devolatizing device. The friction material is agitated by an agitator and discharged therefrom to the conveyor. The supply device includes a pair of roller members each having at its outer periphery a plurality of annular grooves and a plurality of annular land portions. The annular grooves and the land portions extend circumferentially of the roller member and alternate. The axes of the pair of roller members are disposed parallel to each other. The land portions of one of the two roller members are engaged respectively in the annular grooves of the other roller member, and the land portions of the other roller member are engaged respectively in the annular grooves of the one roller member. The pair of roller members are adapted to be driven for rotation in opposite directions, and a gap for allowing the friction material to pass therethrough is formed between the bottom of a respective one of the annular grooves and a respective one of the land portions engaged therein.
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