Device for granulating a thermoplastic, which is extruded from nozzles

Device for granulating thermoplastic materials issuing from orifices (5, 6), said orifices (5, 6) being provided in a substantially circular arrangement in an orifice plate (4) and being swept by blades (8, 9) rotating about a blade carrier shaft (11), said blades (8, 9) being held by a blade carrier (10, 7) in an oblique position with respect to the radial direction, the blade carrier shaft (11) extending centrally of the circular arrangement, the blade carrier (10, 7) being provided in a housing having an essentially round cavity with the blade carrier shaft (11), the housing (13) extending up to the orifice plate (4), and a cooling medium being supplied to the orifice plate (4) and to the blades (8, 9) for cooling the granulated plastic materials, characterized in that a coolant inlet (18) joins into the housing (13) in a generally tangential direction relative to the round cavity for producing an annular flow in the cavity, the housing (13) being penetrated by the blade carrier shaft (11) from a side of the blade carrier (10, 7) directed away from the orifice plate (4), whereby the cooling medium rotates in the housing (13) substantially with a velocity and direction of rotation corresponding to the rotational velocity and direction of rotation of flow openings (20) in the blade carrier (10), through which flow openings (20) the cooling medium reaches the blades (8, 9).