Nissei Plastic Industrial Co. Ltd. has developed a special all-electric injection press, replacing a Nissei hydraulic press, for molding large, light guide plates for notebook computers and other large electronic products.
Nissei also made a special mold to produce the very thin, mirror-surface parts, which are used inside of a back-light unit that leads the light to liquid crystals in a liquid crystal display. The guides can measure 15 inches across.
The all-electric press uses two servomotors for injection and mold clamping. A ball screw and servomotor are tied directly to a driving servomotor.
A newly designed screw, a high-quality barrel and a temperature-control system uniformly melts and holds the resin.
Nissei of Nagano, Japan, said the all-electric press can mold the large, light guide plates on a cycle of less than 30 seconds, vs. 50-70 seconds on a hydraulic press.
Nissei America Inc. is based in Anaheim, Calif.
Tel. (714) 693-3000, fax (714) 693-7777, e-mail [email protected]