This machine is used for deflaking, applied for deflaking and evening kinds of stock (wood, straw, waste paper, etc.) which has been cleaned (heavy rejects and metals). The machine is widely used. It is presently the commonly applied and relatively ideal corollary equipment both at home and abroad. Single set or multi sets in series are allowed. As required by process, it also can be used in series with big-tapered refiner or double disc refiner.