Featuring a greater range of shot sizes, 20% faster dry cycles, and 30% more clamping rigidity, the EC-SX series of all-electric presses was introduced by Toshiba Machine Corp., Elk Grove Village, Ill. The presses have been proven in the Japanese market since 2008, and more than 60 units are already installed in North and South America.
The units boast five screw/barrel sizes for each injection unit, up from three previously. Based on Toshiba’s EC-NII all-electric platform, the new series has wider tiebar spacing and greater daylight (the latter to accommodate popular valve-gate hot-runner molds). EX-SX units are faster due to low-friction linear bearings instead of tiebar bushings. A new toggle design concentrates more force toward the center, and deflection is reduced by two-piece platens with bolt-on plates separated by a small gap, which absorb toggle lock-up force. Longer mold life is said to result from shockless acceleration/deceleration programming. Shielded ballscrews improve cleanliness.
Also new is the V50 controller with 40% faster communication, 8X faster scan time, and a 3-in. larger touchscreen than previous models. Clamp force, barrel temperatures, and injection transfer points can be adjusted automatically with new dynamic self-tuning (DST) software to compensate for changes in resin viscosity or other conditions.
Current EC-SX sizes are 55 to 390 tons; 500- and 610- models are coming soon, and 950- and 720-tonners next year. A 110-ton model with robot costs roughly $150,000 to $160,000.