Measurements of clothing pressure were made both on foot model (solid) and human subjects fitted with samples of men's socks of various designs. A sensory test was further made on the human subjects. Based on the relation between the clothing pressure and the sensory evaluation of the subjects, we discuss designs for comfortable socks. The results were as follows: 1) Clothing pressures at the top of the socks, Malleolus lateralis, and Facies posterior of the Calx of the foot model were higher than those of the human subjects. Therefore, it is important that clothing pressure is examined on the living subjects. 2) According to their evaluation, subjects felt comfort at around 10mmHg pressure at the top of their socks. And comfortable socks were those which had very little sliding at the top and a pressure of 5-10mmHg at the ankle, where stiches easily followed leg motion. 3) Sample with short foot length measured 35.6mmHg at the Facies laterales of the Digitus 1. Subjects felt tightness and complained of extreme discomfort at this value. This indicates that foot length must be adequate so as not to hinder the movement of the toes.
Static electricity of kimono fabrics is considered to be one of the factors contributing to the wearing comfort of kimono (Japanese traditional costume), especially its“susosabaki (easiness of walking around bottom of kimono) ”. The factors affecting static generation of kimono such as relative humidity, materials of kimono and its underwear“juban”, the combination of them, and the measuring site on kimono were examined by using a newly developed walking device. The results obtained showed high reproducibility, and the four factors mentioned above were all statistically significant (P<0.01) . The static charge of the kimono was the highest when it was measured on the left side and on 10 cm above the bottom of the kimono in low relative humidity. Under this condition, the silk kimono showed the highest static charge of all; maximum 4, 0kV, while the antistatic polyester kimono showed the lowest; less than 0.5kV, and the regular polyester one the middle value, maximum 2.5kV, of them. The combinations with antistatic polyester kimono or juban resulted in the decrease of the static charge of another fabric.
The surface of polyethylene terephthalate plain-woven fabric (PET) was sulfonated by reaction with sulfuric acid aqueous solutions having concentrations of 69, 72 and 75%. It was confirmed that the aliphatic and aromatic sulfonic acid groups were formed on the surfaces of the treated fabrics by FTIR-ATR method. The flexural rigidity of treated PET altered very little. The detergent efficiency after soiling in lamp black particles dispersed in CCl4solution was 44.0% and 64.5% before and after the treatment, respectively. The soiling ratio in a 1×10-2% concentration lamp black particles dispersed in detergent solution was decreased from 31.6% to 8.0% by treatment. These detergency and soiling results obtained were attributed to the interfacial electrical property. The zeta-potential of the treated PET fabrics increased a negative charge from -10.0mV to around -20.0mV and a negative charge of lamp black particles was -56.0mV. The difference zeta potential between the PET fabrics and the lamp black particles lowered, and so a repulsive force between the two strengthened after the treatment. It was considered that the remarkable improvement of the detergency and soiling of the treated PET fabrics originated in the zeta-potential change. The fiber surface damage during the treatment, however, affected the detergency and soiling more effective than the electrostatic effect. The fiber surface damage and fabrics structure were detected by SEM using twill-woven cationic dyeable polyester and plain-woven cotton fabrics. The former soiled easily than the latter did, but the detergent efficiency of the former was higher than that of the latter.