Sumitomo Plastics Machinery all electric plastic injection molding machines manufacturer

The injection unit of Sumitomo Plastics Machinery's SES all-electric molding machines provides high injection pressures, high speeds and full multi-function, simultaneous operation. Added to this are the advantages of exceptional precision, repeatability and energy efficiency. The result is outstanding injection performance and high overall productivity.

The SES injection unit features two Sumitomo-built AC servo motors with full closed-loop control and digital sensors that give the injection unit its speed, precision and energy efficiency.

The servo motor for injection uses a load cell to provide feedback that dictates the speed and torque required for precision injection, hold pressure and back pressure. The screw drive motor works together with a position transducer. These specially developed, high-capacity, belted motors deliver sufficient torque while keeping the machine reasonably sized and priced.

The use of two, large-load capacity, ball screws in the injection unit motor provides highly efficient power transmission and outstanding durability compared to single screw motors. To ensure against problems associated with belt wear, the belts used are up to one-and-a-half times wider than competitors' belts, and are constructed of polyurethane reinforced with a tough, proprietary synthetic material.

For accurate, stable control of shot size, three plasticizing ramps — soft, standard and sharp — allow the operator to set the plasticizing acceleration and deceleration response.

Unerring injection velocity control from low to high speeds, and exceptional velocity response, are provided by the use of direct digital control with digital sensors that do not require conversion to analog. Ramping of the velocity can also be tailored by selectable soft, standard and sharp ramping modes. And the excellent linearity from low- to high-range velocities allows precision molding of diverse applications, from thick-walled lenses to thin-walled complicated housings and visually critical parts.

The PID temperature control system is designed to optimize melt conditions, regardless of changes in the molding environment. With 2-second sampling and 0.1°C settable barrel zones, this system shortens heat-up time and ensures precision temperature control.

Programmable switchover from velocity to hold — selectable by position, time or pressure — delivers precision filling of the cavity. Hold pressure, with the ability for ramping, is settable and accurate to within 1kgf/cm² from 0 to 2800 depending on machine size.

An internal resin temperature monitor and an inline, needle-type nozzle shut-off are available as options for optimum control of the melt and high-precision shot control.

Please use the Info buttons above at right to read more about SES Series mid-sized all-electric injection molding machines.