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A device for granulating plastic strands includes an extruder having a nozzle plate with boreholes arranged in front of a manifold and a starting valve connected thereto, and a cutting device with a knife head arranged centrally in a receiving housing wherein the cutting knives of the knife head rot

A device for granulating plastic strands includes an extruder having a nozzle plate with boreholes arranged in front of a manifold and a starting valve connected thereto, and a cutting device with a knife head arranged centrally in a receiving housing wherein the cutting knives of the knife head rotate in the region of emergence of plastic strands which are acted on radially by a coolant. The cooling is accomplished by providing a cutting plate with cooling boreholes aligned axially with the nozzle boreholes of the nozzle plate. These cooling boreholes extend up to an insulating layer except for a recess which is connected to a coolant feedline for releasing at least one flow cross section of coolant which corresponds to the cooling boreholes.

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In a device for granulating plastic strands having a nozzle plate with boreholes arranged in front of a manifold and a starting valve, connected with the latter, of an extruder, and a cutting device with knife head, arranged centrally in a receiving housing, the cutting knives of the knife head rota

In a device for granulating plastic strands having a nozzle plate with boreholes arranged in front of a manifold and a starting valve, connected with the latter, of an extruder, and a cutting device with knife head, arranged centrally in a receiving housing, the cutting knives of the knife head rotating in the region of emergence of plastic strands which are acted on radially by a coolant, the improvement comprising a removable cutting plate and an insulating layer disposed between the nozzle plate and the cutting plate, said cutting plate being provided with cooling boreholes aligned axially with the nozzle boreholes of the nozzle plate and extending up to said insulating layer, an annular recess surrounding a portion of said cooling boreholes and in communication therewith, a feed line connected to said recess to supply coolant thereto and thereby to the cooling boreholes, said cutting plate being connected to said receiving housing to form a unitary structure with said receiving housing and the knife head, and drive means for selectively displacing said unitary structure with the cutting plate and said nozzle plate between separated and engaged positions.