H - Electricity – 01 – B
Patent
H - Electricity
01
B
H01B 7/02 (2006.01) D04C 1/00 (2006.01) D04C 1/12 (2006.01) H01B 13/08 (2006.01)
Patent
CA 2124528
In an electric cable or other elongate body, a tubular textile braid comprises two sets of yarns each made up of a plurality of synthetic monofilaments, the yarns of the two sets extending in opposite directions around the axis of the braid (and so corresponding to upper and lower yarns in the braiding machine) differing in twist to an extent such that the more twisted yarns have their tensile strength increased by at least 10% but do not have their cover in the braid decreased by more then 25%, both by comparison with an otherwise identical yarn having the same twist of those of the less twisted set. Preferably the twist in the upper yarns is zero. The invention allows higher production speed and reduced down-time without significant loss of cover, because the small extra twist in the lower yarns gives them better abrasion resistance to withstand passage through their greater exposure in the braiding machine.
Dans un fil électrique ou dans un autre corps allongé, une tresse de textile tubulaire comprend deux groupes de fils, chacun étant fait de plusieurs monofilaments synthétiques; les fils des deux ensembles se prolongent dans des directions opposées autour de l'axe de la tresse (correspondant ainsi aux fils supérieurs et inférieurs dans la tresseuse); la torsion diffère à tel point que les fils les plus tordus ont une augmentation de force de traction ultime d'au moins 10 p.100, mais sans que leur couvrant dans la tresse diminue de plus de 25 p. 100, les deux par comparaison avec un fil autrement identique ayant la même torsion que ceux des groupes moins tordus. Il est préférable que la torsion des fils supérieurs soit à zéro. L'invention permet d'accélérer la production et de réduire les interruptions sans perte importante de couvrant parce que la légère torsion supplémentaire des fils inférieurs donne une meilleur résistance au frottement lors du passage dans la tresseuse.
Bicc Public Limited Company
Fetherstonhaugh & Co.
LandOfFree
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