Negri Bossi USA Inc. is offering a direct-drive, all-electric injection press, called Elma, from 100-330 tons, then jumping up to 935 tons of clamping force.
The machines have no drive belt or pulleys, even in the 930-ton press, said Liam Burns, general manager.
At NPE 2003, Negri Bossi showed two Elma presses, models of 100 and 180 tons. The firm launched those sizes two years ago at K 2001, later added several other sizes, and then rolled out the 935-tonner at the Plast Milan 2003 show in Italy in May.
Burns said the Elma machines match Negri Bossi's hydraulic presses in shot size and nozzle contact force. The company also is touting high-speed, fast-operation, high-torque and fast screw rotation. Each Elma has four servomotors and one standard electric motor.
One unusual feature: Two motors tied to a gear mechanism work together to turn the screw and move it forward and back. Burns said the motors switch back and forth from spinning in the same direction to spinning in the opposite direction - so they handle both functions.
Movement of the injection carriage is powered by a regular electric motor.
A cantilever, powered by another servomotor, runs the part ejection.
Burns runs Negri Bossi USA, which the company established in Newark, Del. Negri Bossi SpA is based in Milan, Italy.