Detalhes do Documento

Reduction of indigo backstaining by post-washing

Autor(es): Andreaus, Juergen cv logo 1 ; Campos, Raquel de cv logo 2 ; Paulo, Artur Cavaco cv logo 3

Data: 2001

Identificador Persistente: http://hdl.handle.net/1822/12729

Origem: RepositóriUM - Universidade do Minho


Descrição
The undesired redeposition of indigo during the enzymatic ageing of denim garments with cellulases is a problem widely known in industrial laundries. Today, the usual procedure carried out to reduce the undesired side-effect is post-washing, but so far little information can be found in literature about efficient methods to achieve a maximum blue-white contrast in denim garments. This article deals with the possibilities of removing physically adsorbed indigo from cotton fabrics and of reducing the undesired effect of indigo backstaining in a post-washing step. Different chemical reaqents and textile auxiliaries were tested and compared, Up to 80% of the initial colour could be easily removed with one-component washing-solutions and under conditions of high mechanical agitation. Ethoxylated linear fat alcohols and a modified poly acrylic acid were found to be the most efficient chemical reagents at low concentrations to desorb indigo from cotton. Non-ionic surtactants desorbed more indigo-with a decreasing degree of ethoxytation. With non-ionic surfactants the desorption at indigo improved with a decreasing degree of ethoxylation. The best results were achieved with a complex standard detergent
Tipo de Documento Artigo
Idioma Inglês
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Fundação para a Ciência e a Tecnologia Universidade do Minho   Governo Português Ministério da Educação e Ciência Programa Operacional da Sociedade do Conhecimento União Europeia