Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Reexamination Certificate
2005-02-01
2005-02-01
Mayes, Melvin C. (Department: 1734)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
C264S259000, C264S271100, C264S275000, C264S279000, C264S279100
Reexamination Certificate
active
06849220
ABSTRACT:
The invention relates to a method of manufacturing a rotor (12) for a helical screw machine that includes a metal shaft (2) and helical lobes (9) mutually separated by intermediate grooves (13), comprising the steps of providing the shaft (2) with a blind axially extending passageway (10); connecting the passageway (10) with the barrel surface of the shaft (2) by means of at least one channel (11) extending outwardly from the shaft; inserting the rotor shaft (2) in a mold (1) that includes two mutually spaced end-walls (4, 5) which have respective rotor shaft receiving openings (6and7), said openings (4, 5) embracing the rotor shaft (2, 19) at least in a generally sealing fashion; heating the mold (1) and the shaft (2) to the curing temperature of the polymer; delivering polymer-forming materials to the mold (1); maintaining the barrel wall (3) of the mold (1) at said curing temperature until the polymer has cured; and removing the rotor from the mold (1). The method is characterized by the further steps of disposing the outwardly extending channel (11) on the shaft (2) such that said channel will be located generally in the middle of the mold (1) when the shaft (2) is inserted therein; and pressing the polymer into the axially extending passageway (10) at an overpressure of at least 1 bar.
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Sundström Mats
Timuska Karlis
Frishauf Holtz Goodman & Chick P.C.
Mayes Melvin C.
Sevenska Rotor Maskiner AB
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