Abstract: The roll gap control system for a calender having first and second rolls (18, 19) rolling a raw material (B) includes a load measuring unit (11) for detecting a rolling load change between the first and second rolls (18, 19), a roll shaft position adjusting device (41) for increasing/decreasing a roll gap and a controller (46) for computing a roll gap change (.DELTA.h) based on the rolling load change (.DELTA.P) and for activating the roll shaft position adjusting device (41) to compensate for the roll gap change (.DELTA.h). A spring constant (k) of first and second rolls (18, 19) and mechanical members (24, 25, 28) supporting these rolls of the calender is calculated, and the rolling load change (.DELTA.P) is divided by the spring constant (k). The quotient (.DELTA.P/k) is the roll gap change (.DELTA.h).

Abstract: Methods of and apparatus for controlling a startup process of a wire insulating line until a desired outside diameter of an insulated wire is obtained. A startup control apparatus according to the invention comprises an extruder for supplying an insulating material around a core conductor, a take-up device for taking up the insulated wire, a diameter measuring device for measuring an outside diameter of the insulated wire and a processor for monitoring and controlling the line startup process. In a method of controlling the startup process of the wire insulating line, the processor calculates a target speed ratio r between the extruder and take-up device, performs a first correction in which a demanded take-up speed CA' is increased by a predetermined increment .DELTA.CA if a measured wire diameter D is equal to or greater than a target wire diameter D.sub.0, followed by a second correction in which a demanded extruder speed EX' is increased by a predetermined increment .DELTA.