It consists of a concrete chest,horizontal impeller,drive mecharism etc.When the impeller rotates,the mixture of paper stock and water is drawn into the center axis and flung out with high speed by impeller,and then produce intensified turbulent flow and circulation.Since different flow speed and tear in pulp happened at impeller vane result in an intensive internal friction and kneading effect,the paper stock is disintegrated and fiberized.Accepts pass though the screen perforations and pumped to the next process.