Extruder screw element
AssigneesCompagnie Generale Des Etablissements Michelin, Michelin Recherche et Technique S.A.
InventorsTimothy Mazzocca, Andrew Hudson, Michael Brickey
Life of this patent
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Abstract
A screw element (100) for an extrusion machine is provided. The screw element (100) includes a first section (200) and a second section. The first section (200 has a first core (212) with a plurality of facets (214) connected to each other along splines (216). The facets (214) and splines (216) extend longitudinally along the screw element (100). The facets (214) and splines (216) can be helically-shaped. The first core (212) increases in diameter in a continuous manner along the direction of flow of material. The first and second sections (200, 300) include one or more helically-shaped flights (218,219) wrapped around the longitudinal axis of the screw element (100).
Claims15
An extrusion machine, comprising:
- a screw element defining longitudinal, circumferential, and radial directions, the screw element comprising a first section and a second section positioned sequentially along the longitudinal direction;
- the first section comprising
- a first core including a plurality of facets positioned adjacent to each other in the circumferential direction, each facet extending in the longitudinal direction over the first section, each facet joined to an adjacent facet along non-intersecting splines extending longitudinally over the first section, wherein the first core has a diameter that increases in a continuous manner along the longitudinal direction towards the second section;
- a first helically-shaped screw flight wrapped around the first core of the screw element, the first helically-shaped flight extending longitudinally over the first section and projecting radially outward of the plurality of facets;
- the second section comprising
- a second core extending along the longitudinal direction and having a cylindrically-shaped surface;
- and
- a second helically-shaped screw flight wrapped around the second core of the screw element, the second helically-shaped flight extending longitudinally over the second section and projecting radially outward from the second core.
Dependencies are inferred from the claim text.