網糸と網糸との摩耗

概要

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Testing methods for studing the abrasion caused to netting twines have been mainly ex-plored by examining the consequence of its rubbing with other objects, other than itself. The present paper deals with abrasion caused to cremona and polyethylene netting twines due to self-rub by using a special apparatus. The number of rubs were measured while under stress until the netting twines wore away to breaking point. The results obtained are as follows; 1) The netting twines under dry conditions wore away more rapidly than those under wet conditions. 2) The number of rubs necessary for fracture decreased with the increase of twine load and increased with the increase of the frictional angle (the cross angle of two netting twines). 3) The number of rubs necessary for fracture (N) is indicated by the following equation: N=k[(T-W)D/Wcos2 φ ]n where the various letters have the following meanings respectively: k, a constant; T, tensile strength; W, load; D, diameter of netting twines; φ, twist angle of common helix; n, index number.
公益社団法人日本水産学会の論文