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Tokuden Offers High-Precision Hybrid Roll System

Japan-based Tokuden Co. Ltd. reports its High-Precision Hybrid Roll® System for coating, calendering and laminating applications offers roll surface temperature accuracies to within ±0.1°C and mechanical accuracies of 1 micron or less within a certain temperature range.

The new system, an updated version of Tokuden’s original Hybrid Roll introduced in 2004, comprises a roll with a maximum diameter of 800 millimeters (mm) and a maximum working face of 2,000 mm, bearings, a rotary joint, temperature sensors, and a temperature-controlled water-supply unit.

The roll features internal drilled jacket chambers and fluid passageways to equalize the roll temperature and reduce thermal loss, and minimize distortions in roll mechanical accuracy. The jacket chambers are partially filled with a thermal medium and vacuum-sealed. Vapor moves from warmer to cooler sections within the chambers to condense on the cooler surfaces and emit latent heat to raise the temperature in those sections, thus equalizing the temperature within each chamber.

The temperature control unit uses induction heating and works in conjunction with a chiller unit to control the fluid outlet temperature accuracy. The unit may be set within a temperature range of 15°C to 95°C when the circulating fluid is water, and 50°C to 220°C when the circulating fuel is oil.

September/October 2006




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