Continued from the previous report, the preventive effect of an anionic polyvinyl alcohol (PVA) on the deposition of α-Fe₂O₃particles onto cotton and polyester fabrics in the solution containing surfactant has been investigated.
The results obtained were as follows:
1) Although the SDS concentration of about 6 mmol/lshowed the highest preventive effect against deposition, the effect was not found, independently of the concentration, in the polyoxyethylene-nonyl-phenolether (APE) solution.
2) When APE was added to an anionic PVA solution, the preventive effect against the deposition was found even in the lower concentration comparing to the solution without adding the APE.
3) A remarkable preventive effect against the deposition was recognized in an anionic PVA of higher degree of saponification in the system of coexistence of anionic PVA and SDS. However, an anionic PVA of lower degree of saponification did not show the preventive effect against the deposition. Thus, the preventive effect of the anionic PVA solution with the surfactant was considered to be an interaction between the surfactant and an anionic PVA with various degree of saponification.

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A preventive method against seam puckers by using a differential feed in the lookstitch sewing machine has been studied.
The results obtained were as follows:
(1) The differential feed mechanism was effective on the prevention of seam puckers. The seam shrinkage ratio was affected by the differential feed ratio and the pressure of a presser foot. Especially in the case of fabrics with a stretchability the satisfied results were obtained. But the feed marks were observed near a seam line in the case that the fabrics have low elastic recovery and high movability of woven yarns.
(2) As shown in Figs. 4 ( (i) - (iii) ), the shapes of feed dogs were changed so that the differential feed effect concentrates on a seam line. These feed dogs were very effective on the preventions of seam puckers and feed marks.
(3) The uniformity of stitch pitch in a seam was not degraded by using the feed dogs mentioned above.

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As a fundamental study on the removal of blood protein stain from fabrics, the amount of the blood protein stained on the various fabrics, the solubility of these stains into water, the influence of temperature and pH on the solubility were studied using the fabrics artificially soiled with bovine blood by the dipping method.
The amount of the blood protein stained on the fabrics increased in proportion to the concentration of the blood protein and was more on hydrophobic fabrics than on hydrophilic ones. At the same protein concentration, the amount of the blood serum protein stained on fabrics was more than that of the whole blood protein. As to the solubility into water of the blood protein stained on the fabric, the blood protein stained on to a fabric in a state of film forming was difficult to be dissolved, while that stained on the fabrics as multi-layers was easily dispersed. The blood protein stains were easily solubilized from silkhabutae, nylon and polyester muslin, while it was difficult to be solubilized from cotton calico and acryl muslin. The solubility into water of the blood protein stains markedly decreased at 80°C and showed the minimum at pH of isoelectric point of the blood protein.

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