Patent ID: 6989061

Claim:
In a rotational casting apparatus for coating a body with an elastomer comprising a main frame for supporting a body to be coated with elastomer, a mixing head in which a liquid elastomer is contained, and dispensing means operatively connected with said mixing head for dispensing liquid elastomer onto a body to be coated supported by said main frame, the improvement comprising: said dispensing means comprising nozzle means having an interior flow passageway through which the liquid elastomer from said mixing head flows; said interior flow passageway defining a straight longitudinal axis along the length thereof, and having an inlet section in fluid cooperation with said mixing head, an intermediate section, and an outlet opening; said intermediate section comprising a plurality of different portions, each said portion having a cross-sectional shape along said longitudinal axis different from a cross sectional shape of another of said plurality of different portions; each said cross-sectional shape being defined in a plane transverse to said longitudinal axis; each said cross-sectional shape of each of said plurality of different portions defining a cross-sectional area substantially equal to the cross-sectional area of another said cross-sectional shape of said plurality of different cross-sectional shapes; said outlet opening having a substantially elongated-like shape and having a cross-sectional area greater than said cross-sectional area of each said cross-sectional shape of said plurality of different cross-sectional shapes, whereby substantial laminar flow through said intermediate section and substantial equality of dwell-time of each hypothetical section of flowing liquid elastomer in said intermediate section occurs.