How to Choose the Type of Selvage When We Purchase the Chain Link Mesh
How the top and bottom (where the woven strands of wire are bent together) of the chain link mesh is finished is referred to as the selvage. Usually, there are two ways to deal with the edge of the chain link mesh: knuckle and twist (barb). Therefore, the chain link mesh can produce three different types during production. knuckled (KK), knuckled mixed with barbed (KB) and barbed (BB).
Knuckle edge is obtained by interlocking adjacent pairs of wire ends and then bending the wire ends back into a loop. The loop shall be closed or nearly closed to a measurement less than the diameter of the wire.
Twist or barb edge is obtained by twisting adjacent pairs of wire ends together in a close helix of 1-1/2 machine turns, which is equivalent to 3 full twists, and cutting the wire ends at an angle. The wire ends beyond the twist shall be at least 1/4 in. long. This type of salvage is not used on fabric with a mesh size of less than 2 in. Knuckle is more round and much safer because it has no sharp points to catch on clothing or people. However, twisted or barbed have sharp ends for high security.
There are three important factors to be considered before selvage selection. First, the height of the fence, second, the mesh size, the third, the applications. Fabrics with 2 or 2-1/8 in. mesh in heights 60 in. or less shall be knuckled at both selvages. Fabric 72 in. high and over shall be knuckled at one selvage and twisted at the other. The selvages of fabrics with meshes of less than 2 inches shall be knuckled. Generally speaking, residential chain link fence system will have bent over on both top and bottom ends. For commercial especially for the high-security fence, both top and bottom have barb selvage.