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June 12, 2006 02:00 AM

Nissei all-electrics boast improvements

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    Nagano, Japan-based Nissei Plastic Industrial Co. Ltd. passed the 100,000 mark for injection press shipments on Jan. 19.

    The history-making press was an all-electric Elject NEX50 — and Nissei also announced major changes to that line of machines. Nissei moved from its 90,000th machine to 100,000 in less than three years, as the company reports strong overall demand in 2003 and 2004 and steady demand for the Elject NEX series, which debuted in mid-2003.

    Nissei started making injection presses in 1957.

    Turning to NEX changes, Nissei announced a model change for its NEX presses, to boost precision, stability and speed. Changes include: clamping force feedback control for automatic clamping-force correction, faster injection speed and response and a new version of Nissei's TACT controller.

    Nissei engineers developed automatic correction of clamping force to realize a “direct-pressure” type of toggle mechanism. With a toggle mechanism, the clamping force initially set can change over time because of thermal expansion of the mold and tie bars as they get hotter. Also, actual clamping force is unknown, and adjustment cannot be carried out during continuous production.

    The new design solves those problems, Nissei said.

    Also, low-inertia servomotors now employed on NEX machines enable injection speed on presses from 33-121 tons. For example, injection speed on the 55-ton NEX is about 1.5 times as fast as the previous machine. Nissei is targeting thin-wall molding with the innovation. NEX comes in 10 sizes, from 16.5 tons to 507 tons.

    The company's U.S. headquarters is Nissei America Inc. in Anaheim, Calif.

    Tel. 714-693-3000, fax 714-693-7777, e-mail [email protected]

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