Fractional and higher lobed co-rotating twin-screw elements
AssigneeSteer Engineering (P) Limited
InventorBabu Padmanabhan
Life of this patent
Estimating the term…
Abstract
A twin-screw extrude having a novel fractional element has been invented that can provide different tip angles. The twin-screw extruder is suitable for processing thermo plastic, thermo set and other material. It has a barrel with two parallel intersecting bores, two sets of co-rotating fully intermeshed extruder elements that are linked to each other in non rotary manner forming continuous chain, each element operating in one of the bores and each screw being provided with multi lobbed elements that has special geometry.
Claims20
A twin-screw extruder comprising:
- a barrel defining a first cylindrical bore and a second cylindrical bore, wherein the first cylindrical bore and the second cylindrical bore intersect to form a chamber;
- a first shaft that rotates within the first bore about an axis;
- a second shaft that rotates within the second bore about an axis;
- and
- a first set of fractional elements coupled to the first shaft and a second set of fraction elements coupled to the second shaft, each set having a first fractional element with a first lobe defining a first tip angle, a second lobe defining a second tip angle, and a third lobe defining a third tip angle that is different from the first tip angle and the second tip angle.
A conjugate pair of fractional elements for a twin-screw extruder having a first shaft and a second shaft, comprising:
- a first fractional element adapted to be coupled to the first shaft;
- and a second fraction element adapted to be coupled to the second shaft;
- wherein the first fractional element and the second fractional element each have a first lobe defining a first tip angle, a second lobe defining a second tip angle, and a third lobe defining a third tip angle that is different from the first tip angle and the second tip angle.
A fractional element for a twin-screw extruder, comprising:
- a first lobe defining a first tip angle, a second lobe defining a second tip angle, and a third lobe defining a third tip angle that is different from the first tip angle and the second tip angle.
Dependencies are inferred from the claim text.