Online ISSN : 1884-6599
Print ISSN : 0037-2072
ISSN-L : 0037-2072
Volume 62 , Issue 1
Showing 1-10 articles out of 10 articles from the selected issue
  • Yukiko UCHIDA, Tomoko KOSHIBA, Ayano DEMPOYA, FUminori TANABE, Soichi ...
    2021 Volume 62 Issue 1 Pages 44-53
    Published: January 25, 2021
    Released: January 25, 2021

    The aim of this study was to evaluate the thermal comfort by infection-protective clothing (IPC). In Experiment 1, three men wearing five types of IPC (A, B, C, D and E) in a neutral environment (23°C, 50%rh) performed a 20-minute exercise, and followed a 20-minute sitting. In Experiment 2, four women compared three conditions: IPC in the neutral environment, all protective equipment in the neutral environment, and IPC in a hot environment (30°C, 50%rh). As a result, weight loss increased in D and E, which have low air permeability and water vapor permeability. The amount of sweat absorbed by the clothes was large in E, and discomfort sensation continued after the exercise. When exercising with all protective equipment in a neutral environment, the microclimate humidity was about the same as when wearing IP in a hot environment. The thermal comfort of infection-protective clothing is affected by physical properties of the fabrics. Even when working in a neutral indoor environment such as a hospital, wearing all protective equipment will make a hot environment.

    Download PDF (4081K)
  • Kanoko WASHIZU, Kyohei JOKO
    2021 Volume 62 Issue 1 Pages 54-64
    Published: January 25, 2021
    Released: January 25, 2021

    We attempted to dye a diacetate fabric using a logwood extract dye solution as a natural dye. The results showed that the dyeing behavior of logwood pigment species for diacetate fabrics was strongly influenced by the pH of the dye bath and that the dye uptake of logwood pigment at the surface of fabric reached a maximum value around pH 6. The dye uptake increases as the dyeing temperature increases, but the adsorbed pigments desorbs due to the contribution of the endothermic reaction when the temperature rises above 80°C, resulting in a decrease of the dye uptake. In addition, it is possible to mordant the logwood pigment dyed fabrics in the bath containing the active metal ions, such as aluminum, copper, and iron. As a result, we found that the mordant action was possible when the mordanted temperature was higher than the dyeing temperature, but it was preferable to perform the mordant treatment at a higher temperature (>80°C) to completely mordant the logwood pigment.

    Download PDF (3234K)