To solve a problem that an elastic member loses an elasticity by an age variation for a short period of time from when a usage is started, is bent and does not rub a tank wall, thereby a mixing/stirring effect is reduced in the case where the elastic member mounted to a tip end of a stirring arm provided on a rotary driving shaft of a stirring treating tank so as to be projected from the tip end of the stirring arm is made to a rubber plate, which elastic member is urged to the tank wall with bending and rubs the tank wall when the stirring arm is rotated accompanying with a rotation of the rotary driving shaft and a muddy substance and a liquid are mixed and stirred in the stirring treating tank.
The elastic member mounted to a tip end of the stirring arms 11...18 so as to be projected from a tip end of the stirring arm is formed by a textile 21 obtained by weaving a yarn made of synthetic resin.
SAKATA KEN
SAHASHI YUKIO
MITSUDA MASAHIKO
