Maris America Corp. has introduced two new co-rotating twin-screw extruders from Italian parent Maris SpA, both offering high output, thanks to a larger free-volume capacity.
The HS extruder builds on the performance of the company's high-torque, high-speed HT extruder. The HS has an increased ratio of the barrel diameter to the inside root diameter of the screw, or the D/d ratio, of 1.65, with a maximum screw speed of 1,300 revolutions per minute. The higher D/d ratio means a bigger free volume, boosting output.
Maris said the torque on the HS was increased more than 20 percent over the HT series. The machines are geared toward advanced compounding and reactive extrusion.
The other new compounding extruder, the VM, has an even larger D/d ratio of 1.78, and a maximum screw speed of 1,800 rpm. Maris said the new design improves performance in proc¼esses that require large quantities of soft fillers, which have a low bulk density; require a longer residence time; or, with reactive extrusion, require the removal of volatile components such as solvents and monomers.
Maris SpA is in Turin, Italy. Maris America is in Dover, Del.
Tel. 302-678-1705, fax 302-678-1707, e-mail [email protected]