Control system and method for wire insulating line

Abstract

An insulator composition of foamed synthetic resin is supplied to an extruder 3, and the synthetic resin is extruded onto a wire 4a continuously supplied to the extruder 3 at a temperature higher than or equal to a foaming temperature, to cover the wire 4a with the insulator composition. Then, the wire 4a covered with the insulator composition is solidified by cooling in a water-cooling trough 6 movable towards and away from the extruder 3 in a direction of supply of the wire 4a. In this operation, an outer diameter D and a capacitance C of the insulator composition are controlled such that when the water-cooling trough 6 reaches its movable limit, either a deviation .DELTA.D of a detection value of the outer diameter D from its target preset value or a deviation .DELTA.C of a detection value of the capacitance C from its target preset value is selected as a deviation (.DELTA.D or .DELTA.C) that may first exceed a tolerance range upon changing an amount of supply of the insulator composition to the extruder 3, and then the amount of supply is controlled so that the other deviation (.DELTA.C or .DELTA.D) is decreased under the condition where the selected deviation (.DELTA.D or .DELTA.C) falls within the tolerance.

Dependencies are inferred from the claim text.