PURPOSE: To surely crack dehydrated cake and to generate no fragments having sharp edges even when hard cake of low water content is cracked by giving minute projecting and recessed parts to the surfaces of a pair of rollers opposite to each other and also making the difference between the rotation peripheral velocities of opposite rollers.
CONSTITUTION: On the surfaces of a pair of rollers 26, 37 opposite arranged, small projecting and recessed parts are worked by, for example, a knurling tool or the like. Further, by making the diameters of the rollers 26, 37 the same to provide the difference between the revolutions thereof or providing the difference between the diameters of the rollers 26, 37 to rotate them at the same revolution, the difference is provided between the rotation peripheral velocities of the rollers 26, 37. Or the differences between both the diameters and the revolutions of the rollers 26, 37 may be provided. Therefore, when dehydrated cake is passed through a clearance between a pair of the rollers made in such a surface state that the dehydrated cake is easily bitten by the minute projecting and recessed parts on the surface, pressure is applied to roll the dehydrated cake, and at the same time, the difference is provided between the velocities of the rollers, allowing shearing force to be acted on the bitten dehydrated cake to loosen it in good condition.
UCHIYAMA SHIGEYUKI
URYU SHUNJI
SHIMODA MASAO
