Showing papers by "General Cable published in 1968"

Metallic sheathed cables with roam cellular polyolefin insulation and method of making

Abstract: The metallic sheathed electrical cables of this invention have foamed cellular polyolefin dielectric insulation which is fusionbonded to the inside of an annealed sheath to obtain better electrical and mechanical characteristics. The sheath is applied to a foam-insulated core and then sunk down by drawing through a die or reducing rolls to make the tube fit the insulated core snugly. Controlled heating of the sheathing melts the part of the insulation, or adhesive material, when used, which is in contact with the sheath to produce the fusion bond. The heating period is short and is followed by a quench. This controlled heating and cooling is also used to anneal the metallic sheath.

Extra high voltage cables

Abstract: For extra high voltage power cables this invention provides insulation consisting of synthetic plastic material with paper bonded to both sides to form a laminated strip. In place of the porous paper previously used, this invention uses very thin paper such as ''''capacitor tissue''''; space for the thermal expansion of the synthetic and passages for the removal of moisture and the introduction of oil are obtained by embossing the strip. To prevent locking of overlying strips when bending the cable, the embossing is preferably embossed with a random pattern, or plain unembossed strips are wrapped alternately between embossed strips. The invention includes the novel strip, cable made with the strip and the method of making the strip.

Apparatus for imparting a predetermined value of twist to a material

Abstract: An apparatus for imparting a predetermined twist to a multistrand cable during takeup in which a cable twisting unit is mounted for rotation about the axis of said cable and includes a twist imparting means of flexible cylindrical material of endless length and coursing a winding path of a plurality of helical turns around said cable and in engagement with said cable thereby transmitting twist force to said cable to provide a predetermined twist in said cable. A braking means is associated with the cable twisting unit to vary the twisting force transferred by the twist imparting means to the cable and is controlled by a twist sensor sensing variations from the predetermined twist.