JOURNAL of the JAPAN RESEARCH ASSOCIATION for TEXTILE END-USES

Show abstractHide abstract

Effects of fabrics and dyestuffs on the blocking property against UV-rays have been studied for the purpose of protecting human skin from the harmful UV-rays. Polyester taffeta fabrics dyed with eight types of disperse dyes in different chemical structures and colors (two red dyes, three yellow dyes and three blue dyes) were examined. The effect of molar absorption of dye in the UV wave length on UV-rays blocking property^* was discussed. Besides, the relation between the effects of coloring by disperse dye-stuffs on the polyester fabrics and its UPF (Ultraviolet-ray Protection Factor^**) were discussed in com-parison with direct dyes on the cotton fabrics. The results were as follows:
1) The U V-rays blocking property of a non-dyed polyester fabric is much higher than that of a non-dyed cotton fabric. Moreover, the UV-rays blocking property is higher in the UVB region than in the UVA region. Accordingly, the dyeing with dyes having high molecular absorption at the UVA region would provide a polyester fabric with an effective UV-rays blocking property.
2) The disperse dye, Yellow 3, has a high molar absorption coefficient not only at UVA region but also at UVB region.
3) Disperse yellow dyes have a high luminous reflectance on deep shade fabrics, and their blocking prop-erties against UV-rays are excellent.
4) If UV-rays blocking property is indicated as UPF, ninety percent of UV-rays blocking property would correspond to thirty of UPF.
^*The UV-rays blocking property of a fabric is expressed as a function of the transmittance of the light at the UV-ravs region using an instrumentation device.
^**UPF of a fabric is expressed as functions of erythermal effectiveness under the solar irradiation and transmittance at UV-rays region with an instrumentation device.

View full abstract

Download PDF (1313K)

Register with J-STAGE for free!