Shielding tape for cables
AssigneeThe Dow Chemical Company
InventorRaymond C. Mildner
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Abstract
A cable shielding tape comprising a first layer of substantially pure aluminum bonded to a second layer of aluminum alloy which can beneficially be used in cable constructions designed for the transmission of electric power or communications. The cable shielding tape may be formed as a strip having one or both sides coated with or laminated to an adhesive thermoplastic resinous polymer. The tape is disposed within a cable at the desired location to provide good mechanical and electrical properties therein. In addition to providing good mechanical and electrical properties for a cable, the aluminum/aluminum alloy shielding tape substantially reduces the problem of bi-metallic galvanic corrosion caused as a result of interfacing metals having widely differing electrolytic potentials.
Claims30
A cable shielding tape comprising a first layer of substantially pure aluminum bonded to a second layer of aluminum alloy, said aluminum alloy having an elongation to break of at least about 15 percent, a yield strength of at least about 13,000 pounds per square inch, a brinell hardness of at least about 30 and an electrolytic solution potential within about 0.05 volts of the substantially pure aluminum on the basis of N/10 calomel electrodes.
A cable shielding tape comprising at least one layer of aluminum which is at least about 99 weight percent pure aluminum bonded to at least one layer of aluminum alloy, said alloy comprising aluminum having a weight of less than 99 percent and a component selected from the group consisting essentially of magnesium having a weight percent from about 0.2 to about 6, manganese having a weight percent from about 0.1 to about 2, chromium having a weight percent from about 0.1 to about 0.5, copper having a weight percent from about 0.1 to about 1, zinc having a weight percent from about 0.05 to about 2.5, silicon having a weight percent from about 0.1 to about 2, iron having a weight percent from about 0.1 to about 1 and mixtures thereof.
A cable for the transmission of electric power or communications comprising a core including insulated conductor means, a shield completely surrounding the circumference of said core and an outer jacket of insulation over the outside of said shields, said shield comprising a tape having a first layer of substantially pure aluminum bonded to a second layer of aluminum alloy, said aluminum alloy having an elongation to break of at least about 15 percent, a yield strength of at least about 13,000 pounds per square inch, a brinell hardness of at least about 30 and an electrolytic solution potential within about 0.05 volts of the substantially pure aluminum on the basis of N/10 calomel electrodes.
Dependencies are inferred from the claim text.