Patent ID: 8840392

Claim:
A temperature gradient controller device in parts of machines for processing plastic materials configured for manufacturing tubular articles and/or articles having at least one inner cavity having an inner diameter smaller than or as small as 1.5 millimeters, said device comprising heating means to be operatively activated on at least one part of a machine, said heating means comprising vector means configured to transfer a predetermined amount of heat to said part of said machine by remote radiation, the vector means comprising an electromagnetic-radiation beam; wherein said part is an extrusion head which comprises an outer boundary portion and at least one force plug coaxially mounted inside said outer boundary portion and having an inflow channel formed in the force plug, the vector means acting on said force plug, wherein the device also comprises an impact body inserted in the inflow channel at a focus located at an outlet end of the inflow channel and adapted to receive said electromagnetic-radiation beam, wherein said vector means is adapted to carry out said remote radiation without conductive heat fluxes through intermediate pieces or parts interposed between an energy source and said impact body, and wherein the electromagnetic-radiation beam is collimated towards the force plug in said focus.