Comerio Ercole: New patented hydraulic nip adjustment

A patented hydraulic nip adjustment for calender rolls is said to be the first that combines emergency nip-opening capability (to 3-in. separation) with more precise adjustment of the nip gap than is provided by conventional screw-type mechanical devices. Comerio Ercole SpA in Italy developed the hydraulic-piston opening system five years ago. It has seven installations, including one on a lab calendering line at DuPont Co. The Comerio’s nip adjustment uses Moog servo valves and guarantees accuracy of ±0.1 mil.

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