TY - JOUR JF - goljaam JO - goljaam VL - 2 IS - 2 PY - 2006 Y1 - 2006/6/01 TI - Purifying the Leftovers from the Process of Dyeing the Yarn by Applying Nano-membranes TT - تصفیه پسابهای رنگرزی خامه فرش دستباف با استفاده از نانو غشاها N2 - New nanofiltration membranes were produced in the form of unfilled fibers through the photopolymerization method. Parastyrene sodium sulfonate was used as the vinyl monomer to reform the polysulphone ultra-filtration membranes. The modified membranes were used to purify colored solutions of three different pigments consisting acidic, reactive and direct (suitable for dyeing pile yarns and warps), in order to refine and reuse the pigment solutions. The effect of various parameters like pressure, electrolyte, time, and the kind of pigment on the extent to which the pigment is confined and the flux of the membrane outflow was assessed. Results showed that besides the effective function of bleaching, the problem of barred pores observed in most commercial membranes built of polyamide also reduced significantly in the new membranes. SP - 37 EP - 46 AU - Akbari, Ahmad AD - Member of the scientific board for carpet studies, Faculty of Architecture and Art, Kashan University KW - nano-membranes KW - pigments in carpet weaving industry KW - dyeing leftover solution KW - wool yarns KW - bleaching UR - http://goljaam.icsa.ir/article-1-344-en.html ER -