A new servoelectric screw drive optimizes press performance when a job requires a large volume of resin to be plasticated at low rpm rates. Available as an option on all Boy A-Series machines, the servoelectric screw drive reportedly runs quieter, faster, more efficiently, and with more homogenous melt. The drive is optional for Boy?s 14.2-ton 12A, 24.2-ton 22A, 33.7-ton 30A, 60-ton 55A, and 100-ton 90A presses. To show the inherit benefits, Boy performed a comparison of a traditional hydraulically driven screw and the new servoelectric drive. Boy used two 30A presses, each with a different drive, to mold an 11.55g tumbler made from polystyrene. The cooling units? initial temperature was 37 to 39F, and the screw diameters were 28 mm. The servodrive reduced cycle time by 25.8 percent since it rotates independently of the machine?s hydraulics, and energy input was 31.6 percent lower per kilogram of material for the servodrive. Assuming two-shift operation, Boy said the servodrive?s savings would allow for a two-year ROI.
Boy Machines, Exton, PA