PSI-Polymer Systems Inc. of Conover, N.C., introduced a new servo drive for its EGP and CIP series of gear pumps. The company said the drives allow a level of precision for starting, stopping and ramping that is not possible with standard DC or AC motors.
Gear pumps originally were created for continuous polymer extrusion, but they have expanded into applications which now include precision, repeatable small-volume dispensing, in areas such as medical, adhesive and other specialty applications.
The servo drive gear pump technology improves on older-style piston pumps by combining the linearity of the constant volumetric output per revolutions per minute with the precision positional control of a servo drive. That means there is no gear box, zero coasting of the motor, extremely fast reaction times, instant start/stop and fast ramp-up/ramp-down times and a new feature, reversing, according to PSI-Polymer Systems.
In other news, the company has developed a truly leak-free screen changer seal for high-temperature, low-viscosity extrusion coating.
PSI-Polymer Systems has resolved slide-place screen changer leakage problems for extrusion coating through a proprietary upgrade of its patented, lifetime pressure-activated seal. The company sold its first five-layer system in 2015 to a major international engineering form, and is operating in Asia.
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