<p>PURPOSE:To enable maceration in a short time without requiring a collision plate effective in regulating the number of revolutions of macerating blades according to the kind of materials which are composed of a paper material for maceration and promoting the maceration. CONSTITUTION:Plural maceration blades 31 rotatable about the shaft center are installed in a maceration tank 21 into which a material 51 which is composed of a paper material for maceration and a liquid 52 are introduced and the plural macerating blades 31 are rotated and driven in the same direction with a rotating and driving means 41 to produce eddy collisions (Vo).</p>
