Extruder mixing element
AssigneeSteer Engineering Private Limited
InventorBabu Padmanabhan
Life of this patent
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Abstract
A dispersive mixing element for co-rotating twin screw extruder is disclosed. The element for co-rotating twin screw extruder comprises of a continuous flight helically formed thereon having a lead ‘L’, wherein either the flight transforms at least once from an integer lobe flight into a non-integer lobe flight in a fraction of the lead ‘L’ and transforms back to an integer lobe flight in a fraction of the lead ‘L’ or the flight transforms at least once from a non-integer lobe flight into an integer lobe flight in a fraction of the lead ‘L’ and transforms back to a non-integer lobe flight in a fraction of the lead ‘L’.
Claims20
An element for a co-rotating twin screw extruder comprising a continuous flight helically formed thereon having a lead ‘L’, the lead ‘L’ comprising a plurality of fractions;
- wherein either the flight transforms from a first integer lobe flight into a non-integer lobe flight in a first fraction of the lead ‘L’ and back to the first integer lobe flight in a second fraction of the lead ‘L’ or the flight transforms from a first non-integer lobe flight into an integer lobe flight in the first fraction of the lead ‘L’ and transforms back to the first non-integer lobe flight in the second fraction of the lead ‘L’;
- and
- wherein the transformation either from the first integer lobe flight into the non-integer lobe flight and back to the first integer lobe flight or the transformation from the first non-integer lobe flight into the integer lobe flight and back to the first non-integer lobe flight takes place a plurality of times along a lead of the element.
A co-rotating twin screw extruder system comprising:
- a housing having a first housing bore and a second housing bore, the first housing bore having an axis disposed parallel to an axis of the second housing bore;
- at least one first screw shaft being disposed in the first housing bore and at least one second screw shaft being disposed in the second housing bore, the at least one first screw shaft and the second screw shaft having at least one element comprising a continuous flight helically formed thereon having a lead ‘L’, the lead ‘L’ comprising a plurality of fractions;
- wherein either the flight transforms from a first integer lobe flight into a non-integer lobe flight in a first fraction of the lead ‘L’ and back to the first integer lobe flight in a second fraction of the lead ‘L’ or the flight transforms from a first non-integer lobe flight into an integer lobe flight in the first fraction of the lead ‘L’ and back to the first non-integer lobe flight in the second fraction of the lead ‘L’;
- and
- wherein the transformation either from the first integer lobe flight into the non-integer lobe flight and back to the first integer lobe flight or the transformation from the first non-integer lobe flight into the integer lobe flight and back to the first non-integer lobe flight takes place a plurality of times along a lead of the element.
An element for a co-rotating twin screw extruder system, the element comprising a continuous flight having a non-zero flight width helically formed thereon, the element having a lead ‘L’, the lead ‘L’ comprising a plurality of fractions;
- wherein either the flight transforms from a first integer lobe flight into a non-integer lobe flight in a first fraction of the lead ‘L’ and back to the first integer lobe flight in a second fraction of the lead ‘L’ or the flight transforms from a first non-integer lobe flight into an integer lobe flight in the first fraction of the lead ‘L’ and back to the first non-integer lobe flight in the second fraction of the lead ‘L’;
- and
- wherein the transformation either from the first integer lobe flight into the non-integer lobe flight and back to the first integer lobe flight or the transformation from the first non-integer lobe flight into the integer lobe flight and back to the first non-integer lobe flight takes place a plurality of times along a lead of the element.
Dependencies are inferred from the claim text.