B - Operations – Transporting – 30 – B
Patent
B - Operations, Transporting
30
B
26/198, 92/4
B30B 15/16 (2006.01) D21G 1/00 (2006.01)
Patent
CA 1264973
INVENTOR: ROLF LEHMANN INVENTION: METHOD AND CONTROL APPARATUS FOR SEPARATING THE ROLLS OF A CALENDER ABSTRACT OF THE DISCLOSURE The bottom roll of a roll stack in a calender is constructed as a controlled deflection roll equipped with a non-rotatable carrier or support beam and a roll shell rotatable about the non-rotatable carrier. The roll shell is supported on the non-rotatable carrier by means of hydraulic support or pressure elements. The non-rotatable carrier is supported with respect to the calender stand by means of hydraulic carrier support devices. For the rapid opening of the calender and to avoid damage to the roll shell, initially the pressure exerted on the roll shell support elements is reduced in a sudden manner and only after a predetermined -time-delay is there reduced the pressure exerted on the carrier support devices. The time-delay is chosen such that the pressure peak occurring in the roll shell support elements due to the springing back or recovery of the non-rotatable carrier has dropped to a safe value and the risk of damage to the roll shell, such as would occur in the case of a simultaneous pressure drop, is avoided. - 1 -
529850
Lehmann Rolf
Perley-Robertson Hill & Mcdougall Llp
Sulzer-Escher Wyss Ag
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