Center heated die plate for underwater pelletizer

Details Center heated die plate for underwater pelletizer Center heated die plate for underwater pelletizer

2008-07-22

2008-07-22

Heitbrink, Tim (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

Including heating or cooling means

C425S067000, C425S313000, C425S463000, C425S464000

Reexamination Certificate

active

11041865

ABSTRACT:
A center heated die plate for an underwater pelletizer radiates heat outwardly to the extrusion orifices and die faces of the die plate thereby maintaining the die plate and extrusion orifices at an elevated temperature to obtain optimum flow of molten polymer through the extrusion orifices. In one embodiment, a centrally located heating plate is mounted in a recess on the upstream face of the die plate inwardly of the nose cone. In a second embodiment, a cylindrical heating coil is placed in a hollow central core of the die plate between the nose cone on the upstream side and an insulation plug or plate on the downstream side. Heating leads extend through a single radial hole in the die plate to provide power to the center heating element.

REFERENCES:
patent: 3521325 (1970-07-01), Schippers
patent: 4071307 (1978-01-01), Porro
patent: 4123207 (1978-10-01), Dudley
patent: 4621996 (1986-11-01), Hundley, III
patent: 4728276 (1988-03-01), Pauley et al.
patent: 5403176 (1995-04-01), Bruckmann et al.
patent: 5624688 (1997-04-01), Adams et al.
patent: 6474969 (2002-11-01), Ready et al.
patent: 196 09 065 (1997-01-01), None

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