Why are wire elongation & the annealing process so important in high-strength, black-annealed automatic baling wire?
A number of manufacturers sell balers with automatic tiers that use high-tensile (75,000 psi) black-annealed wire either from 50lb or 100 lb. coils in boxes or from 1,500 lb. coils on carriers. As baler manufacturers produce more powerful balers, greater demands are put on the wire used to contain the bale. It has been our experience that wire elongation of greater than 25% is a necessity for these balers for the following reasons: First, a bale expands after it is ejected from the baling chamber and the amount of expansion depends primarily on the products being baled. The baling wire must have sufficient elongation to allow for this expansion or the wire will break. Second, whenever a metal is worked, i.e. twisted, it hardens and loses some of its original elongation. Therefore, the wire at the knot has less elongation than the wire around the bale. If the original baling wire has low elongation, for example – 15% or less, then the wire adjacent to the knot will have insufficient elo
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