Extrusion screw for thermoplastic matter
AssigneeAdvanced Recycling Technology Ltd.
InventorPhilippe Julien
Life of this patent
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Abstract
The extrusion screw for thermoplastic material comprises a helical thread, having a trapezoidal profile with a flat crest and inclined flanks, the pitch and the width or the root of which remains constant, while the inside diameter of the screw increases from the entry of the screw in the direction of the exit.
Claims5
An extrusion screw for thermoplastic matter having opposite first and second ends, a core with an inside diameter, and a helical thread having a root, a flat crest and inclined flanks, characterized in that the pitch and the width of the root of the thread are constant, while the inside diameter of the core increases from the first end toward the second end of the screw and in that the width of the crest of the thread increases as the diameter of the core increases.
Dependencies are inferred from the claim text.