Method for compression molding a fixed centrifuge rotor having s

Details Method for compression molding a fixed centrifuge rotor having s Method for compression molding a fixed centrifuge rotor having s

1995-11-21

1998-11-10

Silbaugh, Jan H.

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

264257, 264258, 264277, 494 12, 494 16, 494 20, 494 31, 494 33, 494 43, 494 81, 494 85, 74572, 74573R, 74574, B27N 502, B29C 4318

Patent

active

058339086

ABSTRACT:
In the compression molding of a fixed angle centrifuge rotor utilizing discontinuous fibers, sample tube apertures cores present in the net-shape mold are covered with pre-cured sample tube aperture inserts. The sample tube aperture inserts have a constant and unchanging inside diameter and are formed from composite fiber. This composite fiber extends from the closed bottom of the inserts, upwardly along the sides of the inserts to the open top of the inserts to provide tensile strength longitudinally of the sample tube aperture inserts. The sample tube aperture inserts have a regular and smooth inside for first accommodating the sample tube aperture cores when the rotor is compression molded and later the sample tubes themselves when the rotor is fully fabricated. These inserts have an irregular outside for forming an interference fit with the subsequently formed compression molded rotor body. Finally, the sample tube aperture inserts have a tapered thickness with the top and open portion of the inserts having a thick wall construction and the bottom and closed portion of the inserts having a thinner wall construction. In use, and when the compression mold is loaded, the sample tube aperture inserts are placed over the sample tube aperture cores. When the mold is fully loaded, and compression molding occurs, the inserts integrally form to the rotor body and the sample tube aperture cores are removed.

REFERENCES:
patent: 1979954 (1934-11-01), Bergman
patent: 2028040 (1936-01-01), Benge
patent: 2128097 (1938-08-01), Mains
patent: 2372983 (1945-04-01), Richardson
patent: 2525469 (1950-10-01), Anderson
patent: 2594693 (1952-04-01), Smith
patent: 2965220 (1960-12-01), Naul
patent: 5362301 (1994-11-01), Malekmadani et al.

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