Apparatus for forming films of constant thickness
AssigneeE. I. Du Pont de Nemours and Company
InventorDaniel G. Tynan
Life of this patent
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Abstract
Counter-rotating intermeshing rotors are employed to generate films of viscous material to enhance processing. The rotors are configured that they trap viscous material in open-ended chambers defined by the rotor surfaces. As rotation proceeds the chambers decrease in volume and the material is expelled through the ends of the chambers as a film. Longitudinally adjacent rotors each have a different angular orientation about their centers of rotation to provide a sawtooth stepped helix to convey material longitudinally.
Claims3
In an apparatus for processing fluid material that includes a housing having a plurality of cylindrical bores and a rotor in each of said bores intermeshed with each other, said rotors being counter-rotating at equal rotational speeds, the improvement of which comprises:
- each of said rotors having a peripheral surface configuration of radial curved portions followed by curves tangent to circles of constant diameter centered about points located on a prolate epicycloid, the radial portions of one rotor coacting with the prolate epicycloid related curved portion of the other rotor during rotation, to provide a constant clearance between the closest point of the rotors to each other and to form an open-ended chamber which diminishes in volume as rotation proceeds so that material in said chamber is expelled through said ends of said chamber as a film.
Dependencies are inferred from the claim text.