An evaluation of the effect of detergent, wash temperature and drying on the colourfastness of indigo and azo dyed cotton fabrics
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Date
2003-11
Authors
Lenka, Mosele Mathapelo
Journal Title
Journal ISSN
Volume Title
Publisher
University of the Free State
Abstract
English: An experimental study was carried out to evaluate the effect of detergent, wash
temperature and drying on the colourfastness of indigo and azo dyed cotton fabric. After
repeated laundering treatments (50 wash cycles) at wash water temperature of 40°C and
60°C, samples were laundered in a Launder-Ometer for 45 minutes in 200 ml of wash
solution with 0,3g detergent, and line dried both indoors and outdoors in open air and
extensive sunlight between 10:00 and 15:00. Colour loss was measured in daylight
(D65/10), UV-light (Woolworths Storelight F11/10) and Tungsten (A/O), using
spectraflash.
Treated indigo and azo dyed cotton fabrics were subjected to colourfastness tests for
washing, crocking, light and staining.
In a colour transfer test where multifibre test strips were used, wool, polyester and nylon
were the fibre types most severely affected by water without detergent (control) none of
the dyes in both fabrics were transferred to fibres treated with the two brands of
detergent.
A correlation of the data by dye used shows that:
• Colour loss increase with the number of wash cycles.
• Indigo dyed cotton loose more colour than azo dyed cotton
• Sunlight causes more colour loss
• More colour loss is experienced at 60°C wash temperature
• Detergents cause more colour loss than water without detergent
• More staining to other fabrics take place without a detergent
• More crocking takes place in the wet than the dry state.
Afrikaans: Die doel van die eksperimentele studie was om die wasfaktore wat kleurverlies van aso en indigo gekleurde katoenstof veroorsaak te ondersoek. Die aso en indigo gekleurde katoestof is 50 keer by onderskeidelik 40°C en 60°C gewas. Die wasaksie is in 'n Launder-Ometer uitgevoer. Elke wassiklus was 45 minute lank en elke houer het 200ml wasvloeistof met 0,3 g detergent A of B asook water sonder 'n detergent bevat. Die monsters is daarna vir 4 ure onderskeidelik binneshuis en in direkte sonlig tussen 10:00 en 15:00 gedroog. Kleurverlies is gemeet in daglig (065/10), UV-lig (Woolworths F11/10) en Wolfram (A/IO) ligstoestande met die spectraflash apparaat. Monsters is van 5, l0, 15, 20, 30, 40 en 50 siklusse onttrek vir toetsing. Kleurafvrywing is m.b.v. die Crockmeter in die nat en droë toestand bepaal. Kleuroordraging na katoen, asetaat, rayon, nylon, poliëster en akriel is deur grysskaal metings bepaal na die eerste aantal wassiklusse. Korrelasie van die data het aangetoon dat: • kleurverlies toeneem met die toename in aantal wassiklusse • indigo gekleurde katoen meer kleur verloor as aso gekleurde katoen • sonlig meer kleurverlies veroosaak meer kleur verlies waargeneem word by 60°C as by 40°C • detergente meer kleurverlies veroorsaak as water sonder detergent • meer kleur na ander vesels oorgedra word sonder die teenwoordigheid van 'n detergent (herneerlegging) • meer kleurafvrywing in die nat toestand plaasvind
Afrikaans: Die doel van die eksperimentele studie was om die wasfaktore wat kleurverlies van aso en indigo gekleurde katoenstof veroorsaak te ondersoek. Die aso en indigo gekleurde katoestof is 50 keer by onderskeidelik 40°C en 60°C gewas. Die wasaksie is in 'n Launder-Ometer uitgevoer. Elke wassiklus was 45 minute lank en elke houer het 200ml wasvloeistof met 0,3 g detergent A of B asook water sonder 'n detergent bevat. Die monsters is daarna vir 4 ure onderskeidelik binneshuis en in direkte sonlig tussen 10:00 en 15:00 gedroog. Kleurverlies is gemeet in daglig (065/10), UV-lig (Woolworths F11/10) en Wolfram (A/IO) ligstoestande met die spectraflash apparaat. Monsters is van 5, l0, 15, 20, 30, 40 en 50 siklusse onttrek vir toetsing. Kleurafvrywing is m.b.v. die Crockmeter in die nat en droë toestand bepaal. Kleuroordraging na katoen, asetaat, rayon, nylon, poliëster en akriel is deur grysskaal metings bepaal na die eerste aantal wassiklusse. Korrelasie van die data het aangetoon dat: • kleurverlies toeneem met die toename in aantal wassiklusse • indigo gekleurde katoen meer kleur verloor as aso gekleurde katoen • sonlig meer kleurverlies veroosaak meer kleur verlies waargeneem word by 60°C as by 40°C • detergente meer kleurverlies veroorsaak as water sonder detergent • meer kleur na ander vesels oorgedra word sonder die teenwoordigheid van 'n detergent (herneerlegging) • meer kleurafvrywing in die nat toestand plaasvind
Description
Keywords
Azo, Colour loss, Crockfastness, Detergent, Dyes, Indigo, Laundering, Lightfastness, Staining, Cotton fabrics, Colorfastness (textiles) -- Testing, Laundry, Dissertation (M.Sc. Home Economics (Microbial, Biochemical and Food Biotechnology))--University of the Free State, 2003