An effect of the temperature of 20-50°C and relative humidity of 0-100% has, from the kinetical point of view, been investigated on the amount of formaldehyde liberated from fabrics finished with melamine, urea or glyoxal resins. If a temperature raises, a remarkable increase in the amount of free formaldehyde has been found for all fabrics. However, comparing the amount of free formaldehyde of each finished fabrics, the fabric finished with melamine resins tends to produce the greatest increase in amount of formaldehyde except under the high humidity. The results have been analyzed from the view point of the potential amount (FP) of formaldehyde liberated from the fabrics finished with resins. The value FP has been derived from the analysis of the rate of the formaldehyde release. It has been concluded that the increase of the liberated formaldehyde due to raise of temperature and relative humidity is caused by the increase of the value FP.
Clothings (combination of upper garments and skirts) worn by women in streets have been photographed in 1975-1976 and classified into several patterns by a cluster analysis. One typical clothing has been selected from each pattern. These typical clothings have been represented by the item and category. The item, category and scores of the image of the clothing have been analyzed by the quantification theory. type 1, to obtain the numerical value of clothing category contributing to the visual image. The item and category of a clothing contributing to the visual image have shown the visual image of the clothing remarkably differ from season to season. This is due to the different degree of contribution to the image for each factor of clothing. Moreover, a possibility has been found to estimate the image of any given clothing using a category weight obtained by this analysis.
The differential threshold or the least concentration of the fluorescent brightening agents in laundering solution which affects the visual colour of the plain dyed fabrics have been investigated on the thirteen kinds of cotton broad fabrics by using the psycho-physical method of mimimal change. The light pinkish and two kinds of white fabrics, i.e., commercial fabrics finished or unfinished with a fluorescent brightening agent, have shown an effect of fluorescent brightening agents even under lower concentration of fluorescent brightening agents than those of normal laundering solution. However, bluish and grayish fabrics have shown an effect under rather higher concentration. Other broad fabrics of eight kinds of colours have shown no visual effect even though fabrics have been treated in the solution containing a fluorescent brightening agents of 55 times concentration of normal laundering solution. In addition, the correlationship has been analysed between the results of sensory tests and the variation of colour due to absorption of fluorescent brightening agents, i.e., intensity of fluorescent light, spectral reflectance, dominant wave length, excitation purity, or brightness (Y value) . Analyses has shown that the fabrics treated with fluorescent whitening agents have higher reflectance value in the range of short wave and, moreover, reflectance value and intensity of fluorescent light are more accelerated by a sorption of fluorescent brightening agents in the range of short wave.