Centrifugally Powered Pelletizing Machine And Method
Centrifugally powered pelletizing machine and method
A centrifugal pelletizing machine has a hollow electrically and thermally conductive rotor with a series of orifices along its outer rim portion for centrifugally powering strands of heated thermoplastic material from a body of said material in a flowable state within the interior of the rotor. A knife mounted on the frame adjacent the rotor orifices severs the strands into pellets of a predetermined length. A molten material feed tube with fins therein at the exit end to divide the flow extends into a rotor housing to direct flow in a uniform manner to an axially opposite impeller on the rotor and control single screw extruder , which have a peripheral magnetic flux conducting plate system extending to and forming a part of the housing creating a flux field which is interrupted by the spinning rotor to induce currents in the rotor which heat it according to the temperature sensed.
In accordance with the disclosure which follows, a hollow rotor having radially directed orifices in its peripheral rim portion is mounted for rotation within a housing about a horizontal axis. A severing band device, positioned to direct severed extruder machine in a path tangential to the rotor into a water spray duct, extends generallyparallel to the twin screw extruder axis across the path of strands expressed from the rotor orifices to cut pellets from the distal ends of the strands. A magnet powered system, mounted to permit opening of the front cover of the rotor housing to provide readyaccess to the rotor housing, is provided to heat the rotor, and the rotor temperature is continuously sensed to control current supply to the magnets and achieve the desired rotor temperature necessary to maintaining the particular polymer at its optimumextrusion temperature.
Other objects and advantages of the pelletizing machine will be pointed out specifically or will become apparent from the following description when it is considered in conjunction with the appended claims and the accompanyingdrawings.