Statistično načrtovanje postopka apretiranja viskoznih tkanin iz močno vite preje - 1. del: Apretiranje z reagenti z nizko vsebnostjo formaldehida

The results of mathematical-statistical method for optimizing cross-linking of fabrics made from hard twisted yarn by using a reagent with low formaldehyde content - methylated dimethyloldihydroxyethylene urea (DMDHEU) are presented in the paper. The influence of the concentration of a cross-linking reagent, catalyst and non-ionic softener on certain applicability properties of finished viscose fabric is investigated. The following parameters were monitored: the degree of viscose fibres swelling, the breaking force, the breaking elongation and the angle of decreasing, as well as the influence of the finishing process on the colour of viscose fabrics made from hard twisted yarn. By using a cross-linking reagent with low formaldehyde content the following has been obtained: the decrease of viscose fibres swelling by 29.5 % - 62.7 %, the increase of the angle of decreasing by 18.4 % - 144.3%, the reduction of breaking force (by 7.2 % - 22.9 %) and the breaking elongation (by 6.2 % - 20.9 %). The process of cross-linking does not cause any noticeable colour deviations on dyed fabrics.