Browse Prior Art Database

Technique for Making Flat Cables

IP.com Disclosure Number: IPCOM000044308D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Travieso, R: AUTHOR

Abstract

A technique is described whereby the life of multi-wire flat cables used in electrical assemblies is increased, particularly in applications where cables undergo considerable flexing. Most multi-wire flat cables currently use annealed copper wire for the electrical conductors, which are then insulated with a plastic, such as polyvinyl chloride (PVC). The annealed copper was generally selected for its high conductivity and ductility. This method of manufacture is usually quite adequate in stationary applications. However, in applications where flexing of the cable is required, rupture of the copper wire is experienced. To prevent cable failure, it was determined that, by using hardened copper wire instead of annealed copper wire, the occurrence of failure due to wire rupture was reduced significantly.

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Technique for Making Flat Cables

A technique is described whereby the life of multi-wire flat cables used in electrical assemblies is increased, particularly in applications where cables undergo considerable flexing. Most multi-wire flat cables currently use annealed copper wire for the electrical conductors, which are then insulated with a plastic, such as polyvinyl chloride (PVC). The annealed copper was generally selected for its high conductivity and ductility. This method of manufacture is usually quite adequate in stationary applications. However, in applications where flexing of the cable is required, rupture of the copper wire is experienced. To prevent cable failure, it was determined that, by using hardened copper wire instead of annealed copper wire, the occurrence of failure due to wire rupture was reduced significantly. It was found that the rupture load of hard drawn copper wire was
7.10 - 7.44 kilograms as compared to 3.74 - 3.90 kilograms with the annealed wire. Flexing tests revealed that the fatigue life of the cable using the hardened copper wire is twice that of cable having annealed copper wire. Also, in terms of cost, it was found that hard drawn copper wire is less expensive than annealed copper wire.

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