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’.

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’.

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’.

Abstract: A process for preparing a blend having a styrene resin and a polyphenylene ether in a co-rotating twin screw processor is described. A blend having a styrene resin and a polyphenylene ether is also described. A co-rotating screw processor for preparing a blend having a styrene resin and a polyphenylene ether comprising two processing zones is also described.

Abstract: A barrel alignment structure for a pair of barrel sections each defining an end surface configured to abut each other is disclosed. The barrel alignment structure comprises of a plurality of alignment pins distributed on the end surface of the first barrel section. The barrel alignment structure further comprises of a corresponding number of slots defined on the end surface of the second barrel section, each slot configured to receive one alignment pin, wherein the slot has a width substantially equal to that of the alignment pin and a length larger than the width of the alignment pin permitting relative thermal expansion between the pair of barrel sections. An extruder barrel section is also disclosed. The extruder barrel section defining an end surface configured to abut the end surface of another extruder barrel section. The extruder barrel section comprises of a plurality of alignment pins distributed on its end surface.

Abstract: An extruder barrel section is disclosed. The extruder barrel section comprises of a first barrel pad and a second barrel pad. The first and second barrel pad co-operating to define a recess configured to receive an extruder liner. The length of the first and second barrel pad is less than the length of the extruder liner such that the extruder liner defines an end surface that projects beyond the extruder barrel section on at least one side. The end surface is configured to abut the end surface of another extruder liner. The extruder barrel section further comprises of a locking structure configured to lock the first barrel pad to the second barrel pad with the extruder liner therebetween.

Abstract: A system for efficient torque transmission, consisting of at least one driving member and at least one driven member, which uses a complementing spline profile having almost nil stress concentration which enhances the overall torque transmission capacity of a shaft with a given diameter.

Abstract: A system for clamping together a pair of extruder barrel sections of an extruder is disclosed. The system comprises of a clamp that includes an upper arm, and a lower arm connected to the upper arm at one edge of the upper arm. The upper and lower arms cooperating to define a recess configured to receive a pair of extruder barrel sections. The clamp further includes a locking structure configured to lock the upper arm to the lower arm with the pair of extruder barrel sections therebetween. The system further comprises of a support structure for the clamp that includes a bracket connected to the clamp and a column connected to a base of the extruder. The bracket and column are connected to each other such that relative movement between the bracket and the column is permitted axially along the extruder barrels sections. An extruder is also disclosed.

Abstract: A barrel alignment structure for a pair of barrel sections each defining an end surface configured to abut each other is disclosed. The barrel alignment structure comprises of a plurality of alignment pins distributed on the end surface of the first barrel section. The barrel alignment structure further comprises of a corresponding number of slots defined on the end surface of the second barrel section, each slot configured to receive one alignment pin, wherein the slot has a width substantially equal to that of the alignment pin and a length larger than the width of the alignment pin permitting relative thermal expansion between the pair of barrel sections. An extruder barrel section is also disclosed. The extruder barrel section defining an end surface configured to abut the end surface of another extruder barrel section. The extruder barrel section comprises of a plurality of alignment pins distributed on its end surface.

Abstract: A system for clamping together a pair of extruder barrel sections of an extruder is disclosed. The system comprises of a clamp that includes an upper arm, and a lower arm connected to the upper arm at one edge of the upper arm. The upper and lower arms cooperating to define a recess configured to receive a pair of extruder barrel sections. The clamp further includes a locking structure configured to lock the upper arm to the lower arm with the pair of extruder barrel sections therebetween. The system further comprises of a support structure for the clamp that includes a bracket connected to the clamp and a column connected to a base of the extruder. The bracket and column are connected to each other such that relative movement between the bracket and the column is permitted axially along the extruder barrels sections. An extruder is also disclosed.

Abstract: An extruder capable of improved mixing is disclosed. The extruder comprises of a housing having at least two cylindrical housing bores, each housing bore having an axis disposed parallel to the other axis. The extruder further comprises of at least a first screw shaft and a second screw shaft being disposed in the first and second housing bores. The first and second screw shaft being provided with extruder processing elements that defines a mixing zone. The first and second screw each having extruder D and a screw root diameter d. The first and second screw shaft each having a volumetric ratio of at least 1.4 wherein the volumetric ratio is defined by the extruder diameter D divided by the screw inner diameter d.

Abstract: An extruder barrel section is disclosed. The extruder barrel section comprises of a first barrel pad and a second barrel pad. The first and second barrel pad co-operating to define a recess configured to receive an extruder liner. The length of the first and second barrel pad is less than the length of the extruder liner such that the extruder liner defines an end surface that projects beyond the extruder barrel section on at least one side. The end surface is configured to abut the end surface of another extruder liner. The extruder barrel section further comprises of a locking structure configured to lock the first barrel pad to the second barrel pad with the extruder liner therebetween.