Applying jacket material to corrugated metal shields of telecommunications cable

摘要

In a method of applying a jacket to a metal shield of a cable, the jacket comprises a polyolefin having a modifier provided by a carboxylic acid or its anhydride. As the jacket extrudate passes onto the shield, air pressure is lowered at the surface of the shield to provide intimate overall contact between jacket and shield. Heating, additional to that provided by the extrudate, is employed to raise the outside bonding temperature of the shield up to at least the bonding temperature of the modifier so as to provide a bond between the jacket and the shield.