Search

En tecnología textil, el estudio de los fenómenos de fricción de fibras, hilos y tejidos tiene un gran interés puesto que permite conocer y predecir su comportamiento a lo largo del ciclo textil. El acabado silk-like es una práctica industrial que tiene por objeto conseguir que los tejidos de PES 100% presenten unes propiedades de cayente y mano similares a la seda natural. En este estudio se ha analizado la influencia de los parámetros del proceso de acabado silk-like sobre las propiedades friccionales de los tejidos de calada acabados mediante este método. In textile technology, the study of the friction phenomena of fibres, yarns and fabrics is of great interest because it allows to know and to predict their behaviour throughout the textile cycle. Silk-like finishing, is used to obtain 100% PES fabrics mimicking natural silk in drape and hand. In this study, the influence of the parameters of the silk-like finishing process on the frictional properties of the polyester fabrics finished by this method have analyzed, Postprint (published version)

This work was conceived to investigate for the first time the effectiveness of the combined use of xylanase and laccase for the removal of hexenuronic acids (HexA) and lignin from sisal pulp fibres. To this end, xylanase (X) and laccase (L) treatments were used in an XLQPo sequence (where Q denotes a chelating stage and Po an oxygen-reinforced peroxide multi-step treatment) that was applied to pulp in order to obtain sisal fibres with a high cellulose content. The results of the XLQPo sequence were compared with those of an LQPo sequence. The L stage of both sequences was performed in the presence of either the natural compound sinapyl aldehyde (SLD) or the synthetic compound violuric acid (VA), employed as mediators, in order to compare their efficiency in aiding pulp bleaching and HexA removal. Changes in HexA content and the contributions of lignin and HexA to kappa number during each sequence were examined. The xylanase treatment was found to remove 47% of lignin, 15% of xylan and 27% of HexA from the initial pulp, whereas the laccase–VA system removed 28% of HexA and exhibited higher efficiency than the laccase–SLD system in reducing kappa number and increasing brightness. In any case, when the X treatment was applied, the sequence including laccase–SLD treatment resulted in the strongest delignification effect. The effluents from each stage of the bleaching sequences were analysed for COD, colour and toxicity, which peaked after the L stage and were significantly higher with SLD than with VA, Postprint (published version)