Changes in mesh size of polyamide nets as affected by repeated loading and relaxation

Abstract

      The paper presents the results of the study of changes in mesh size of polyamide trawlnets as affected by repeated loading and relaxation.

      The testing of netting strength shows that at mesh stretching the twine very frequently comes out of the knot (slippage) rather than breaks, due probably to inade­quate finishing of the netting.

      At applying three different load ranges (2-6 cN/tex, 6-10 cN/tex and 10-14 cN/tex) the deformations of mesh size were greatest at the first load range connected probably with twine elongation and further knot tightening.

      Under repeated loading-relaxation deformations are greatest during the first cycle.