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- Title
INFLUENCE OF ENZYME PRE-TREATMENTS ON NATURAL DYEING OF PROTEINIC SUBSTRATES.
- Authors
Alina, POPESCU; Laura, CHIRILA; Carmen Pyerina, GHITULEASA; Constanta, HULEA; Mariana, VAMESU
- Abstract
This study presents dyeing behavior aspects with Allium Cepa infusion of 100% wool yarns and 70% wool/30% Angora mohair blended yarns. Variants of yarns that were pre-treated according to the classical procedure of scouring were compared with variants of yarns that were subjected to proteolytic enzyme pretreatment. The pre-mordanting technique with potassium alum was experimented. The influence of pretreatments on natural dyeing was studied in terms of dyeing intensity, colour fastness to washing, artificial light, acid and alkaline perspiration, physical-mechanical and physical-chemical characteristics. Colour measurements have evidenced an increase of the tinctorial affinity to natural dye of wool fibre subjected to preliminary enzyme treatment followed by pre-mordanting. In the case of wool-Angora mohair blended yarns the tinctorial affinity to natural dye does not improve. Colour fastness to washing, acid and alkaline perspiration is good and very good for all the variants of treatment applied. Pre-mordanting has not positively influenced the colour fastness to light. Preliminary processes applied either in the classical or in the enzyme variant followed by pre-mordanting and dyeing induced a decrease of the breaking strength of 100% wool yarns by approx. 20% in the case of classical treatment and by 16% in the case of enzyme treatment while they do not negatively influence the breaking elongation values. For wool-Angora mohair blended yarns the enzyme treatment was much more aggressive compared to the classical one, leading to much lower values of the breaking strength, compared to the raw witness yarns, the decreases reaching up to 40%.
- Subjects
ENZYMATIC analysis; NATURAL dyes &; dyeing; SUBSTRATES (Materials science); POTASSIUM compounds; ALUM; YARN
- Publication
Annals of the University of Oradea. Fascicle of Textiles, Leatherwork, 2014, Vol 15, Issue 1, p83
- ISSN
1843-813X
- Publication type
Article