Patent ID: 7320585

Claim:
A device for the hot granulation of thermoplastic polymers, optionally expandable, which consists essentially of: a) a die, consisting of a cylindrical body having a thermostat-regulator for maintaining the die at a temperature close to or higher than the softening point of the polymer, containing on the outer surface a plurality of small plates, equipped with a plurality of extrusion holes, and a plurality of feeding ducts of the molten polymer, situated inside the cylindrical body in correspondence with and connected to the perforated small plates, lined with a material having a high thermal conductivity; b) a cutting chamber comprising a set of spraying nozzles which create a jet of drops of a themostat-regulating liquid used for cooling and removing of the cut granules, nebulized and sprayed against the die; c) a cutting system comprising a cutting plate, firmly constrained to a rotating shaft, supporting a set of knives arranged so that the cutting profile of the knife is radial with respect to the surface of the die which faces said cutting system.