To easily manufacture at low cost material granulate for frictional material without requiring a special device by a method wherein primary granulate which are formed by granulating a starting material containing the fibrous material of the frictional material, a powder material and a binder, are crushed.
In order to produce material granulate for frictional material (or secondary granulate) suitable for the manufacturing of the frictional material used in the brake, clutch or the like of various vehicles, industrial equipments or the like, first of all, primary granulated matters are produced. Concretely, a fibrous material, a powder material and a binder, which are metered so a to form a predetermined mixing ratio, are charged in a mixing device so as to uniformly mix these materials in order to obtain a starting material. Next, by adding the proper amount of water to the mixing device and then rolling the starting material, a primary granulate 1 is obtained. After that, by crushing the primary granulate 1 in the same mixing device, the secondary granulate 2 are obtained. The crushing is performed by a method, in which a rolling speed (or the rotating speed of the rotating blade of the device) is made faster than that at the granulating time of the primary granulate 1 is made higher in order to collide the primary granulate with one another, or the like.
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