Pulp insulation for telephone cables

After some 40 years of service spirally wrapped paper insulation is rapidly being displaced for interoffice and subscriber loop cables, by a pulp insulation applied directly to the conductor by a process which brings the paper mill into the cable plant and combines the paper making and insulating operations into one process with the elimination of a number of costly intermediate steps. In addition, this process makes possible the use of a less expensive material as an insulating medium.