A Statistical Consideration of Wool Felting : Factorial Experimentation of Ternary System Comprising Detergent, Concentration and Mechanical Action

羊毛の収縮率測定には従来多くの方法があるが,主体は毛織物の収縮に限定され,しかも精度が充分でないばかりか,多量の材料を要する欠点がある。我々は毛糸編物の縮絨について,所謂中性洗剤(アルキルアリルスルフオン酸塩型及びアルキル硫酸エステル塩型)の影響をしらべる目的で,平織,ガーター編,メリヤス編等の編物試片を作製し,その洗浄に際しての収縮を測定したが,精度,再現性共に不良で,定量的な結論は殆ど得られなかつた。そこで,直接毛糸の収縮率を測定すると共に,編物に於ける糸の相互作用をも考慮に入れた比較的精度の高い実験方法を案出し,異つた温度條件毎に,洗剤の種類,洗剤の濃度,機械作用,を三因子とする要因分析を行つた結果,興味ある二三の成果を得たので,茲に報告する。There were introduced a number of procedures for quantitative determination of wool shrinkage, but owing to their inaccuracy we were unable to come to any general conclusion in the case of wool yarn. Therefore, a simple but well controlled testing method was devised by us for wool yarn shrinkage. After repeated preliminary experiments, a statistical method was adopted for experiments. The results of the experiments underwent variance analysis of theternary system consisting of alkyl-arylsulfonate and alkylsulfate type detergents, their concentration and mechanical action, and the following conclusions were reached. (1) Detergent type causes a considerable degree of felting. (2) Shrinkage is affected by decrease in detergent concentration, and pure water is most responsible for felting. (3) Increasing mechanical action increases shrinkage. (4) Temperature also has a remarkable effect on felting. (5) Na-carbonate solution has almost no effect on shrinkage