By using a spool geometry to create rapid switching between operating modes on the injection axis, Moog was able to boost the injection and ejection speed of Sumitomo (SHI) Demag’s new El-Exis SP injection molding machines. The Moog D680 Proportional Valves that were used were optimized in conjunction with Sumitomo (SHI) Demag, and, going forward, the company reports that all sizes of its El-Exis SP machines will use the Moog D680 Proportional Valve Series because of the faster response times due to high valve dynamics created by the direct operated pilot valve. Moog also stated that the pilot valve is energy efficient as well since there’s very little oil leakage when the valve spool is in the center position.
Moog said injection pressure levels were drastically reduced from 100% to 10%, while acceleration time was cut from 120 to 35 milliseconds and absolute pressure decreased to 800 bar. Moog noted that D680 valves on the ejector axis also compressed cycle time and boosted the accuracy of the ejection movement, translating into better production efficiency.
Sumitomo (SHI) Demag said earlier models of the El-Exis SP machine had secured a foothold in closures and thin-walled packaging, markets where energy and process efficiency are a must. In a statement, Hans Juergen Popp, director of technology for Sumitomo (SHI) Demag, said, “Moog valves are the fastest and most reliable on the market for high-speed plastic machines.”