有結節蛙又結節網地および無結節網地の重量

概要

論文の詳細を見る
An estimation method for the weight of netting was proposed and weight properties of several knotted and knotless netting were examined. Netting weight (W) could be expressed as a function of number of yarns (n) and mesh size (2L) by the following linear relation, W/(n•de)=A+B•(√n•de/p/2L) where A and B are constants respectively expressed as follows; A=23.8q(kD)2 and B=A(b-2a)kD, where q and kD are the degree of packing of netting twine and a constant relating to the twine diameter, and a and b are constants depending on the type of the knot. The values of A and B calculated from the netting weight table (W(n, 2L) data) for knotted and knotless netting were found to be constant regardless of the kind of fiber. However, A was different depending on the kind of netting (knot type and twine construction). The value of B was found to be remarkedly different between knotted and knotless netting; B=0.00134 for knotted netting while B=0.00003-0.00009 for knotless netting. It was shown that the weight ratio of both netting changed in the range of 0.7 to 3 depending on the size of 2L and n.
日本水産學會の論文