Quarterly Scientific-Research Goljaam

UV irradiation was known as an important factor for skin cancer and also textile fibers and dyes degradation. UV rays have high energy photons degrading dyes and fibers causing fading and rotting of textiles when they are exposed to sunlight. The sun blocking properties of a textile are enhanced when a dye, pigment, delustrant, or UV absorber is present which absorbs UV radiation and releases heat. They block the transmission of UV and inhibit the dye and fiber exposure. In this study, natural dye of madder with different mordants and two organic acids including: tannic acid and citric acid were selected for dyeing wool. Impacts of tanninc acid and madder on UV transmission were investigated. Also the effects of madder on protecting fabrics against UV were determined by measuring their tensile strength. The results indicate that tannic acid has positive influences on blocking UV and even increasing the tensile strength. The results also reveal that silver nitrate and copper sulphate are the best UV blocking among others. Finally, the wool fabric sample treated with silver nitrate and dyed with madder along with tannic acid exhibits the highest protection against UV.

This research work involves the dyeing of wool yarns with saffron petals as a source for green color. At first step woolen pile yarns treated with four different mordents, namely: tin chloride, copper sulfate, aluminum sulfate and iron(II) sulfate in acidic condition using acetic, oxalic, citric and lactic acids respectively. In this study the possibility of using saffron petals as a natural dye for wool yarn was investigated. By using different mordents a range of hues from green to yellow and brown was obtained. Color parameters, washing fastness, rubbing fastness (wet & dry) and light fastnesses of the dyed yarns were measured. It can be concluded that the best mordents for dyeing wool yarn with saffron petal to obtain green color are tin chloride and aluminum sulfate. The results of fastness tests of samples treated with tin chloride are poorer so that the best suggested mordent for dyeing wool with saffron to get green color is aluminum sulfate.