EFFECT OF DRYING METHODS ON DYEING CAPACITY OF VARIOUS PLANTS
This paper presents a study on the effect of drying methods on dyeing capacity of Eucalyptus globulus L.bark and Allium cepa L.peels on chemical pulp.These plant materials are rich in polyphenolic compounds such as tannins,anthocyanins and other flavonoids,which are natural colorants.In the frames of this work,three different drying methods were examined,the natural,the air and the freeze drying method,in various conditions.Moreover,the effects of extraction conditions on the dyeing capacity of both plant samples were also examined.The plant materials that were dried naturally show weak dyeing result in comparison with the air and freeze dried ones.Moreover,freeze drying gave similar dyeing result with air drying.In the case of air drying,the stronger dyeing results were achieved from plant materials that were dried at low temperature and high relative humidity (T = 30 oC and 95% RH).Referring to the extraction conditions,the dyeing result depends primarily on the extraction temperature while the residence time shows minor impact.
air drying Allium cepa L. chemical pulp dyeing constant Eucalyptus globulus freeze drying natural colorants natural drying
S.Papadaki M.Krokida D.Economides A.Vlyssides E.Koukios
School of Chemical Engineering,National Technical University of Athens Zografou Campus,Athens,GR-15700,Greece
国际会议
The 18th International Drying Symposium Conference(第十八届国际干燥学术大会(IDS2012))
厦门
英文
1-5
2012-01-11（万方平台首次上网日期，不代表论文的发表时间）