I. Overview

The braid is one of the main structural elements of the wire and cable. This structural element has the advantages of good softness, strong continuity and easy Point, so far still widely used in wire and cable.

(A) the function of the braid

In the structure of the wire and cable, the weaving layer mainly has the following functions:

1. Used as an electromagnetic shielding

Communication cables, signal cables, instrumentation cables, control cables and thermocouple extension cables and other products, if the cable itself (group) between the core, or between the cable and the outside world, from or reduce the electromagnetic interference between each other, It is necessary to have a shielding effect on the electromagnetic field in the structure of the product. Metal wire weaving is a commonly used shield, it has a certain shielding effect of electromagnetic Dang, usually with tinned copper or copper wire for weaving.

2. Used as a mechanical strength reinforcement layer

A braided layer consisting of a galvanized low carbon steel wire can be used as a general mechanical protective layer for the cable. Such as marine cables, there are many specifications are galvanized low carbon steel wire braid layer coated on the surface of the rubber sheath to improve the cable in the laying and use of mechanical strength. The metal braid layer to ground, but also play a role in electrical safety protection. The use of galvanized or tinned high strength medium carbon steel wire composed of braided layer, with high mechanical strength. These are made of high strength fiber yarn braided layer, not only soft, good flex performance, but also has a certain mechanical strengthening. There is also a knitting layer mixed with a metal wire and a fiber thread, which has the advantage of moderate mechanical protection and flexing performance, but is generally only placed between the inner and outer sheaths. Such as rubber insulation cotton yarn braided wax, rubber insulated wax yarn weaving soft wire and other products, these fiber braid layer is the role of mechanical protection of the wire.

3. Used as an external conductor for coaxial communication cables

The use of copper braid as a coaxial communication cable outside the conductor, has been widely used.