초록 ▼

A control device in particular in a multi-roll press (22 to 24) of a calender intended for the glazing of a continuous thin web, such as a paper web, which said press comprises a compensated upper roll (22), a compensated lower roll (24), and at least one press roll (23) fitted between the rolls. Th

A control device in particular in a multi-roll press (22 to 24) of a calender intended for the glazing of a continuous thin web, such as a paper web, which said press comprises a compensated upper roll (22), a compensated lower roll (24), and at least one press roll (23) fitted between the rolls. The control device itself comprises a press-load control circuit (B, C, D, 11, 14, 15; A, 29, 30), a compensation circuit (E, 16, 17) for the upper roll (22), as well as a compensation circuit (F, 27, 28) for the lower roll (24). According to the invention, both of the compensated circuits (E, 16, 17 and F, 27, 28) are, via their own feedbacks (12 and 13), connected to the control circuit (B), which is fitted so as to select the most slowly changing one from among the signals of the feedbacks (12 and 13) and to brake down the roll (22 or 24) whose compensation is being varied most rapidly. By means of the invention, the calender will always be loaded in a constant way, whereby a better paper quality and constant running values are obtained.

대표청구항 ▼

A device for bending-compensation control of a multi-roll press of a calender for glazing of a continuous thin web, such as a paper web, which press comprises an upper roll (22) with a first compensation circuit (E), a lower roll (24) with a second compensation circuit (F), and at least one press ro

A device for bending-compensation control of a multi-roll press of a calender for glazing of a continuous thin web, such as a paper web, which press comprises an upper roll (22) with a first compensation circuit (E), a lower roll (24) with a second compensation circuit (F), and at least one press roll (23) arranged between the upper and the lower roll, said device comprising: a press-load control circuit (A, B, C, D) comprising a first part (A) acting upon the lower roll (24) and a second part (D) acting upon the upper roll (22), a first feedback (13) for transfering from the first compensating circuit (E) to the control circuit (A, B, C, D) a first signal indicating the rate of compensation of the first compensation circuit (E), a second feedback (12) for transfering from the second compensating circuit (F) to the control circuit (A, B, C, D) a second signal indicating the rate of compensation of the second compensation circuit (F), means (B) in the control circuit (A, B, C, D) for selecting, among the first and second signals, the signal that indicates the slower rate of compensation and to brake down the roll (22 or 24) that has the higher rate of compensation, a third feedback (29, 31) connecting the first part (A) of the control circuit (A, B, C, D) to the first compensation circuit (E), a fourth feedback (30) connecting the first part (A) of the control circuit (A, B, C, D) to the second part (D) of the control circuit (A, B, C, D), and a fifth feedback (18, 19) connecting the second part (D) of the control circuit (A, B, C, D) to the first compensating circuit (E).