All Electric Injection Molding Machines
SHC Models General Purpose Injection Molding Machines 
SGM Models Ultra High Speed Injection Molding Machines   

      The high speeds and pressures of high-performance hybrid and hydraulic machines
      The exceptional energy efficiency and cleaner molding environment of other all-electric machines
      Ultra-high precision and repeatability that exceed belt-and-pulley driven all-electric machines

Available in various model sizes up to 200 tons, the SED Injection Molding Machines features four direct-drive, Sumitomo-built, AC servo motors with full closed-loop  control and digital sensors. All four motions — plasticizing, injection, clamping and ejection-are controlled by these motors. Each motion except  plasticizing uses a ball screw, and all four motors are beltless, providing  superior mechanical efficiency, repeatability and durability, and avoiding  the problems associated with belt wear/adjustment and belt dust. 

Extensive R&D has gone into the design of the SED motors to achieve a lighter, more compact, low inertia design with the best mechanical configuration for each motion. The result is a low inertia system that draws power only as it is needed, is easier and faster to stop and start, and is exceptionally precise. And the use of permanent magnet stators has made these synchronous motors even more energy efficient. 

When you make the comparison with other manufacturers' all-electrics and hybrids, the SED Injection Molding Machine's difference is clear due to features such as:

      Up to 50-millisecond velocity response for narrow pitch
       connectors and micromolding 
      Unerring velocity control, from .01 mm/sec to maximum for
       improved precision on a wide range of parts 
      SK-II Control option for the industry's highest level of fill precision
       and density control
      New CPP clamp design with increased platen rigidity and
       improved force distribution
      Faster, quieter clamp open/close speed (1200mm/sec)
      Added width between tie bars and a larger overall platen area
      Unique auto lube system that protects the ball screws and allows
       a clean molding environment
     Easy-to-use N-VIII control with 12" touch screen, internal memory
       for 200 mold setups and full SPC/QC capabilities
      3 days free in-plant training
      24/48 Month Warranty


The Injection Unit

SED Series	Previous Series

This diagram compares the compact, low-inertia, direct-drive configuration of the SED (left) with the previous model. The SED's motor for injection uses a load cell to provide feedback that dictates the speed and torque required for precision injection pressure. The screw drive motor works together with a position transducer. 

Sumitomo's commitment to continuous improvement is evident throughout the SED Series. You'll find a wider range of available injection units. Improved performance and energy efficiency. Plus innovative new features that "push the envelope" of precision and repeatability.

The SED's direct-drive motors feature a lighter, more compact, low inertia design — and the advantages of this design are substantial.

First, there's the higher injection power (torque) and velocity. With injection speeds up to 500mm/sec, and injection pressures up to 2900 kgf/cm² the SED provides the performance capabilities for the most demanding applications. 

Second, there's faster velocity response, unaffected by belt elasticity. Well-suited for narrow pitch connectors and micro-sized parts, the SE30D, for example, has a 50-millisecond velocity response with a maximum injection velocity of 500 mm/sec. 

Third, the SED delivers unerring velocity control from .01 mm/sec to the maximum velocity, providing improved precision on wide range of parts including thick-wall lenses, visually critical and thin-wall parts.

Simultaneous with these performance improvements, the energy efficiency of the motors has been further improved through the use of permanent magnet stators. Being synchronous rather than induction type motors, power is not drawn to maintain position, thus lowering energy use. The new motors also have been designed to accept a broader range of incoming power without requiring a transformer.

For accurate, stable control of shot size, three plasticizing programs allow the operator to set the plasticizing end position and select sharp, standard or soft ramping of screw speed. There are also now 10 modes available for ramping control of injection fill and hold, and screw pullback delay has been added as standard.

The SED's PID temperature control system optimizes melt conditions with 2-second sampling and 0.1°C settable barrel zones. A Fine Flow Control screw assembly, for easier color change and superior pressure transmission, is standard. 

Programmable switchover from velocity to hold — selectable by position, external signal, or pressure — delivers precision filling. Hold pressure is settable and accurate to 1kgf/cm² from 0 to 2400 depending on machine size.

Flash Speed Mode (Standard)-At injection speeds of 300mm/sec and higher, the SED automatically goes into Flash Speed mode. In this mode, fast response control of velocity and pressure, before and after V/P switchover, prevents short shots and warp from overpacking.

Synchro-Plast Control (Option)-For resins with low viscosity or uneven pellet size, this option optimizes the control of both screw position and back pressure, ensuring plasticizing stability.

The Industry's Most Advanced Injection Control
The SK-ll Control option uses a specially designed screw tip assembly and control software to:

      Eliminate back flow during screw pull back
      Improve shot density control by pre-set pressure and forward
       screw speed, automatically compensating for any changes in
       resin properties
      Achieve new levels of fill precision (weight and density) and
       peak pressure stability

On completion of recovery, the check ring is mechanically sealed, completely shutting off material flow (or back flow). Pressure is then put on the screw prior to injection. When the pre-set pressure is reached, the machine control calculates the required density correction for the next shot to achieve the correct shot weight. The pressure and speed at which the forward motion occurs are set on the Injection Option control screen for the SK-ll.

The Clamp

For clamping and ejection, the SED features two, direct-drive, digitally controlled AC servo motors. Full closed-loop control of mold open/close position and speed, plus monitoring by precise optical encoders, ensure maximum mold protection and consistent molding cycles. 

The SED has "raised the bar" for clamping performance with several significant
improvements and added features.

      New direct-drive technology has allowed the clamp open/close
       speed to be increased 50% — to 1200mm/sec — and vibration has
       been lowered, for improved cycle times and smooth, quiet operation

      Faster response time and a higher ejector speed of 333mm/sec
       are also made possible by the SED's direct-drive technology

     The new CPP (Center Press Platen) clamp design plus the
       SED's increased platen rigidity provide improved force
       distribution, elimination of short-short and flash problems,
       and improved mold protection

      The horizontal clearance between tie bars has been
       extended, allowing for the installation of larger mold 
       bases and ease of mold changeover 

      Connecting ejector rods from the mold to the knockout
       plate is easier now, too, due to added access space

      A new ejector impact absorber feature helps prevent parts
       from sticking to the ejector pins

      Moving platen supports have been redesigned with a larger
       shoe for added support area-and they've been made a
       standard feature

      Other features added as standard include an emergency
       stop button on the non-operation side and a clear, PMMA
       window on the clamp guard

Applications flexibility and superior mold protection

SED clamp operation also provides the capabilities needed for a wide range of applications. Three-stage mold open/close speed control can be used to tailor machine operation to specific mold requirements. Excellent clamp force linearity, from low to high tonnage, enables optimum setting of clamp force to suit parts with different projected areas. And selectable auto-ramping modes can be used to optimize clamp open and close profiles for fast cycling with shock-free movement.

Optional multi-toggle clamp force control offers two modes: a high-cycle mode in which filling can begin during clamping for improved cycle time; and a gas-release mode in which filling can begin during low-pressure clamping for improved part quality.

Plus, mold protection is never an issue with the SED. With low pressure mold protection settable to 0.3mm, and mold open/close positions settable to 0.1mm, precision mold protection is ensured and there's no banging — even at high speeds. Mold open stop position accuracy of 20 microns, an important factor for take-out robots and 3-plate molds, is ensured with monitoring by precise optical encoders and full closed-loop control.