rotor will encounter the clockwise facing portion 52 of each of the baffles 50 which will tend to redirect that stock both toward the center of the tub and also downwardly with this redirecting force increasing as the stock climbs higher the major component of movement of the stock along the tub wall is vertical rather than circumferential as a climbing wall of relatively self supporting pulp and the peak 54 along which the baffle surfaces 52 are joined and especially the point 51 where they join the portions 53 tend to cut or otherwise to subdivide the climbing wall of pulp into strips which are more easily redirected back into the tub under usual operating conditions all such climbing stock will be redirected back into the tub before it reaches the upper sides 52 of any of the baffles 50 but if any stock should climb that high it will tend to slide by gravity back into the tub along the smooth surfaces of the baffle sides 53 which are inclined downwardly at angles in the range of 40 u00b0 to 50 u00b0 satisfactory results have been obtained in testing the invention with a pulper equipped with only three of the baffles 50 which will effectively cover one half of the cylindrical wall 10 but it has also been found desirable to provide an additional baffle 55 in each of the spaces between adjacent baffles 50 each of the baffles 55 has four generally triangular sides 56 of the same dimensions to provide a generally diamond shape with a point 57 these diamond shaped baffles 55 supplement the action of the baffles 50 in.