日本水産学会誌
Online ISSN : 1349-998X
Print ISSN : 0021-5392
ISSN-L : 0021-5392
漁網染料の防腐効力に就て
宇野 道夫
著者情報
ジャーナル フリー

1934 年 3 巻 2 号 p. 83-86

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抄録
The object of the present paper is to know the influence of preservative dye on the weakening of cords in the sea. The results of the test examination carried out by the Nippon Teitigyogyô Kenkyû-kwai (The Japanese society for the study of the fixed net fishery) were analysed after the method adopted by Dr. M. TAUTI in the study of the weakening of netting cords. The results obtained are as follows: -
(1) The weakening of the dyed cord in the sea is represented by the following equation, logT/T0-T=-K loget+const., where T is the breaking strength after t days' submersion, T0 the strength of the cord saturated with water but not acted on by the decomposing agents, and K a constant.
(2) The value of K is indifferent to the kind of dye of common use, not containing tar, and it is the same whether dyed or not.
(3) Most dyes containing tar as a chief constituent reduces the value of K of the dyed cords which hang down freely in the sea but the reduction is not notable when they are subject to the fishing operation.
(4) If t1 represent the days of submersion when the value of T is equal to T0/2, the difference of the value of t1 of a dyed cord from that of the white cord may be taken as a measure of the preservative effect of the dye. The preservative effect of most dyes in the case, where the dyed corbs are subject to the fishing operation, is nearly proportional to that in the case, where the dyed cords hang down freely in the sea.
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