Methods of forming seams in moisture barriers for cables
Abstract
Abstract A COMMUNICATIONS CABLE SHEATH IS PROVIDED WITH A SEALED METALLIC BARRIER TO PREVENT MOISTURE DIFFUSION INTO TRANSMISSION COMPONENTS OF THE CABLE. THE BARRIER IS FORMED OF A LONGITUDINALLY APPLIED METALLIC STRIP IN WHICH A RESULTANT OVERLAPPED SEAM IS SEALED WITH AN ACRYLIC ACID-ETHYLENE COPOLYMER THAT HAS BEEN INSERTED INTO THE SEAM, IN TAPE FORM AND SUBSEQUENTLY HEATED BY THE EXTRUSION OF A THERMOPLASTIC SHEATH OVER THE METALLIC STRIP OR, IN THE ALTERNATIVE, IS HEATED BY PASSING THE FORMED METALLIC STRIP AND THE ASSOCIATED TRANSMISSION COMPONENTS THROUGH AN INDUCTION TYPE OR OTHER APPROPRIATE HEATING DEVICE. AN ALTERNATE EMBODIMENT INVOLVES A CABLE SHEATH IN WHICH THE COPOLYMER IS APPLIED AS A PRECOATING ON THE INSIDE SURFACE OF THE METALLIC STRIP, HEAT TRANSFER FROM THE THERMOPLASTIC EXTRUSION OPERATION TO THE OVERLAPPED SEAM CAN TAKE PLACE WITHOUT ENCOUNTERING AN INSULATING BARRIER OF THE COPOLYMER. THE LATTER EMBODIMENT CAN BE PRACTICED WITH VIRTUALLY NO CHANGE TO CONVENTIONAL CABLE SHEATHING EQUIPMENT AND APPARTUS.
Inventors
- 👤 Roger R Wahlberg
Bibliographic Details
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