(57) In providing a dried insulation layer (46) upon conductor (12), a covering fluid
layer (46) is initially provided by a process and apparatus in which the layer is
formed from composite material (24) comprising magnetically permeable particles homogeneously
mixed with a fluid carrier. The fluid layer is formed by passing the conductor through
a reservoir of the material and then vertically through a die (26, 64). The reservoir
of fluid applies pressure atthe die orifice and this pressure is adjustable to vary
the rate at which the material passes through the orifice and thus varies the diameter.
This pressure is controllable by adjusting the height of the reservoir above a die
orifice or by adjusting gas pressure acting downwardly upon the material. The diameter
of the layer is advantageously measured after it is dried and variation in measured
diameter from that desired effects a change in pressure to alter the diameter towards
that desired. The diameter of the layer may, however, be measured with the layer in
fluid form.
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