Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Reexamination Certificate
2002-12-05
2010-12-07
Lee, Edmund H. (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
C264S143000, C264S211230, C264S211130, C264S346000
Reexamination Certificate
active
07846360
ABSTRACT:
Process for the production of granules of expandable thermoplastic polymers by means of extrusion, which comprises: i) melting the polymer in a single- or multi-screw extruder (2); ii) incorporating an expanding agent in the polymer in the molten state; iii) granulating the polymer thus obtained in a device comprising a die (111), containing a series of ducts (115) made of a material having a high thermal conductivity (114), a cutting chamber (118) containing a set of hydraulic nozzles and a cutting system equipped with a set of knives (215) with a cutting edge which is radial with respect to the surface of the die; iv) annealing the granules thus obtained; v) cooling the annealed granules to room temperature.
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patent: 7320585 (2008-01-01), Casalini
patent: 305 862 (1989-03-01), None
Lee Edmund H.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Polimeri Europa S.p.A.
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