Electric presses handle long hold times.
Niigata also upgraded its larger all-electric machines, exemplified by the new 198-ton model MD180W i6.5. Its platens are 60 mm wider and mold height is 100 mm greater than on the previous model. Max. injection speed is 200 mm/sec, and a Long Holding Pressure (LP) feature allows for dwell times up to 200 sec at 19,575 psi for molding thick parts. This feature utilizes high-output, low-torque motors and a special reduction control that prevents the electric servo motors from heating up or bunting out during long hold times.
Niigata has also brought the LP function to vertical presses. Its MDVR50 S-IV LP model for lens molding can maintain 19,575 psi holding pressure for 60 sec.
Also new from Niigata at the show was a new 715-ton electric press with compression molding/coining capability for large, flat, thin-wall articles such as diffuser plates for tv screens or light-guide plates for computers. Such products previously were possible only through "extrusion molding," Niigata says. The MD650S-IV AP achieves mold-gap positions accurate to +/-0.02 micron using Niigata's Active Press (AP) control. Tel: (630) 875-0202 * PT Direct: 842 FF
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|Title Annotation:||KEEPING UP WITH Injection Molding|
|Date:||Dec 1, 2005|
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