The effects of hole-diameter and the extrusion velocity on the maximum draft, at which all filaments break, were studied with spinometer and ammonium sulfate coagulation bath, to avoid the influence of regeneration of cellulose. The results are as follows:
1) The maximum draft is determined mainly by the linear extrusion velocity, regardless of hole-diameter or delivery volume.
2) Müller's bath gives slightly higher maximum draft than ammonium sulfate bath, but shows similar behavior. Therefore, the regeneration affects slightly on the maximum draft ratio.
3) The maximum draft shows nearly parallel correlation with the spinnability and may be applicable as the qualitative measure.

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Creep phenomena of polyethylene terephthalate fiber were measured under 1g/d load at the room temperature. The amorphous fibers of various birefringences were drawn at various draw ratio for the samples used.
As the result it was observed that the creep velocity decreases:
(1) with increase of draw ratio,
(2) with increase of initial birefringence at the same draw ratio, and
(3) for the higher degree of polymerisation at the same draw ratio and birefringence of amorphous fibers.

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First, the dropping waste from each machine was collected and analysed by “Shirley Analyser” and from the amount of trash in the original or bale cotton the residual amount at any stage was calculated by deducting the amount removed in the waste.
On the other hand, the cleaning action of each machine was investigated by the following formula: where R: weight percentage for original cotton, r: weight percentage for each sample, C_a: cleaning action, L_l: lint loss, E₁ or E₂: index of cleaning effect, and suffix, t: trash content, l: lint content, i: process number.
The results may briefly be summarised in the following manner. The Crighton Opener is the most effective for cleaning action in blowroom machinery. And large step in cleaning are associated with beater of the Porcupine or Exhaust Opener and Finisher Scutcher.
The index of cleaning effect of each machine are nearly equal to the Crighton Opener except the Hopper type machinery.

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Experimental data is presented on shrinkage by soaking, in warp direction, of wool fabrics set in hot water, and correlations of setting temperature, soaking temperature, and shrinkage by soaking are disecused. Different tendencies in shrinkage at wet state and dry state after soaking at various temperatures and that they depend on setting temperature were observed. Sudden increase in shrinkage above took place from 75 to 85°C in soaking temperature, and it was especially remarkable in day state. Shrinkage and setting temperature had linear relation in wet state, but, often in dry state, had a minimum value in shrinkage. The latter case is due mainly to shrinkage during setting in water of high temperature. These phenomena were analysed from a set of single fibers of wool, their stress relaxation and stretch by swelling in soaking, and their recovery in drying.

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The effects of hot water-treatment and steam heat-treatment on the dyeing property of Amilan (6-Nylon) with a levelling acid dye (Fast Red EA acid salt, old CI No.182) was studied, and following results were obtained.
(1) The amount of dye up-take at equilibrium (C_∞) was decreased by hot water-treatment, and the apparent diffusion coefficient (D) was not altered at 80°C, it increased at >80°C, and decreased at <80°C.
This may be due to the fact that the crystalization was brought about by hot watertreatment, but at the same time the lowered orientation by the treatment counterbalanced in the cross on the value of D.
(2) Though Amilan is decreased in C_∞ its D increased by steam heat-treatment, and accordingly the dyeing property was considerably improved.

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The absorption isotherms of Azoorseillin, Azo Blue (C. I. No.463) and Dianil Azurine G (C. I. No.502) at 90°C, from baths containing 0.05×10^-3, 0.1×10^-3 and 0.5×10^-3 mol dye with varying salt concentration of 0.05_??_3.0 mol NaCl per kg dyeing liquor were determined. The relations between the chemical structure, the aggregating properties of dye ions (N. Ando; J. Chem. Soc., Japan, 64, 1431 (43″), C. A. 41, 3299e) and the affinity for cotton were studied. The time to obtain each equilibrium absorption of these dyes is longer than for Aizen Direct Blue BBH (C. I. No.406), Diamine Blue 3 B (C. I. No.477) and Nippon Sky Blue (C. I. No.520), and the time required is same for Congo Red (C. I. No.370) and Benzopurpurine 4 BKX (C. I. No.448). The mean standard affinity was calculated by Vickerstaff's method. The values of Congo Red, Benzopurpurine 4 BKX, Azoorseillin, Azo Blue, Dianill Azurine G, Aizen Direct Blue BBH, Diamine Blue 3B, and Nippon Sky Blue were 5.8 Kal, 5.9 Kal, 5.6 Kal, 4.9 Kal, 5.8 Kal, 5.1 Kal, 5.2 Kal and 5.8 Kal, respectively. The effects of the presence of OCH₃, CH₃, OH, NH₂ group in the dye molecule on dyeing property were (1) the hydration of fibre, (2) the hydration of dye, (3) the affinity of dye for cotton, (4) interaction between dye ions in solution. Azoorseillin did not indicate the correlation of aggregation with substantivity.

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