Sumitomo Plastics Machinery all electric plastic injection molding machines manufacturer

For the injection unit, the Sumitomo Plastics Machinery’s SE-HY Series injection molding machines feature an AC servo motor for plasticizing and accumulator-assisted hydraulics for injection unit displacement, injection, hold pressure, back pressure and screw pull back. Injection rates for the SE-HY range from 3141 to 4021 cm³/sec dependent on model and screw diameter selected.

The SE-HY's accumulator-assisted hydraulics are similar in design to the hydraulics employed on Sumitomo's widely field-proven SGM Series ultra-high-speed toggle machines. On the SE-HY, two accumulators work together with a digital servo valve with highly sophisticated measuring and feedback devices for fast-response, precision injection control. The direct interaction between the velocity transducer and this servo valve provides faster response for injection control. The large-capacity, bladder-type accumulators ensure stable pressure control, eliminate the need for special nitrogen tanks and reduce variation due to ambient temperature changes. The oil and nitrogen pressure sensor circuit provides consistent pressure control and smooth transition. PID control of oil temperature delivers uniform response for accurate, repeatable profiling.

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.

The SE-HY is also equipped with oil temperature PID control and readout, an in-line return filter and a suction strainer with blockage alarm. 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 SE-HY Info buttons above at right to read more about SE-HY Series ultra-high-speed hybrid injection molding machines.