Extruder maker American Kuhne Inc. has introduced a new barrier screw for fractional melt high density polyethylene, and a new process controller for extruders.
The touch-screen Aktive extrusion process controller provides a single location for setting and adjusting controls, intuitive process adjustment with graphic touch screen, computer-assisted creation and storage of unlimited recipes, coordinated control of drives, real-time monitoring of multiple process variables trends and alarms.
Aktive is designed for pipe, custom profile and tubing manufacturers that need more automated information to reduce scrap and improve efficiency.
In screw news, Edward Seward, director of process technology, designed the HP-2 barrier screw for fractional melt HDPE in high-pressure applications. Kuhne said the new HP-2 provides up to 20 percent more output than previous designs, when back pressure is 3,500 pounds per square inch or greater.
Seward said the screw is ideally suited for HDPE pipe, sheet, small profiles and blow molding where the processor is forced to live with a restrictive die situation.
The Norwich, Conn., company also introduced a low-cost barrel air-cooling system called Turbo Air-Cooling System, which has a high level of heat removal capacity approaching that of water cooling. The new design can hold existing barrel set points on extruders with screw diameters from 2½ inches through 6 inches, in the vast majority of applications that require water cooling.
In another cooling-related development, Kuhne said its research has shown that its Even-Flow water-cooled technology gives a simple, low-cost modification to eliminate “one-sided” cooling that can damage water-cooled extruders. Kuhne documented this so-called “siphon effect” during an intensive study at its research and development laboratory. Problems happen at the plumbing “T” connection where the water flow is split to the left and right heater halves.
Tel. (860) 886-7745, fax (860) 887-7621.