B - Operations – Transporting – 04 – B
Patent
B - Operations, Transporting
04
B
26/158, 233/9
B04B 7/08 (2006.01) B29C 53/66 (2006.01)
Patent
CA 1311731
COMPOSITE MATERIAL CENTRIFUGE ROTOR ABSTRACT OF THE DISCLOSURE A composite material centrifuge rotor and process of construction of the rotor is disclosed. A rotor having high stiffness of fibers, preferably carbon, bound together with resin is disclosed. The rotor in- cludes a top disk, a bottom disk and a spacer belt spac- ing the two disks apart to form a rotor assembly. The top and bottom disks are fabricated by overlying multi- ple layers of tape, the tape being made from longitudi- nally extending and parallel fibers held together with resin. The tapes are stacked in multiple layers normal to the spin axis of the rotor so as to lie within the plane of the centrifugal force exerted by the rotor. Successive layers of tape are oriented so as to vary the longitudinal direction of the fiber with respect to a preselected radius vector from the spin axis of the rotor. When the tape is compiled in multiple layers to a thickness of the top and bottom disk, the tape is compressed between two metal plates and cured at a tem- perature well above the expected autoclave temperature of sterilization of the rotor. Thereafter, a spacer belt consisting of a spirally wound resin impregnated and cured fiber is placed to space the top and bottom disks apart. Thereafter, the entire assembly is wound by a peripheral belt with resin impregnated high stiff- ness fiber. This fiber is cured and shrinks during curing to exert hoop tension around the periphery of the rotor assembly. This hoop tension in turn radially prestresses the rotor equal and opposite to the radial tension forces of centrifugal force when the rotor is in use. B4/11169-8 Beckman 8D-507
568145
Beckman Instruments Inc.
Macrae & Co.
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