Patent ID: 7008203

Claim:
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 ).