抄繊糸の研究

第13報 撚数が糸の強伸度におよぼす影響について

抄録

In Report IV, the effects of moisture content in cut-material, and the weight of traveller upon the dry strength and elongation of the yarn while twisted were reported, and in this experiment then effects using the same samples upon the wet strength and elongation are tested. The result, showns that when the heavier traveller is used and the moisture regain of the cut-material is 50%, more wet strength can be obtained. Then the changes of strength and elongation of both the twisted and untwisted yarn were measured. when the yarn is more twisted or untwisted under the dry condition, the strength of yarn decreases. But when the moisture regain of cut-material is 50%, whether the yarn is twisted or untwisted with the possible heaviest traveller, the decrease of strength is very small, especially, of the wet strength. After testing the strength of commercial paper yarns and spun yarn under the same treatment, the results and then comparing them compared with those cited above show that decrease of the strength is caused by the decreased contact of the yarn.