STUDY OF THE EFFECT OF INTERTWINE ON THE LIGHTFASTNESS OF COLOURS OF COTTON KNITTED FABRICS

Abstract

The goal of the work is to determine the dependence of lightfastness of colours obtained by reactive dyes on the interlacing of cotton knitted fabrics. The study was carried out using cotton knitted fabrics of various interlacing: plain, rib  knitted  fabric  1×1  and  pique.  Samples  of  knitted  fabric  were  previously  prepared  by  the  combined method of washing and peroxide bleaching. Dyeing was carried out by reactive dyes brand Bezaktiv Cosmos periodically. The insolation of the dyed samples was carried out on a device with a mercury-tungsten lamp. The lightfastness of the samples was evaluated according to BS 1006 UK/TN standard by determining color differences at regular intervals using a colorimeter.  The paper presents the results of a study of the effect of interlacing of cotton knitted fabric on the resistance of colours obtained by reactive dyes to light. It is established that the surface structure of knitted fabric affects the fading of colours with reactive dyes to varying degrees. It has been proven that a knitted fabric with a uniform smooth surface loses colour less under the action of light due to its ability to evenly  distribute  energy and  reflect incident light compared to  knitted fabrics with  an  uneven  and  rough
surface.  Based  on  the  data  obtained,  the  mechanism  of  the  effect  of  light  on  knitted  fabrics  of  various interlacing is given.
Originality. The influence of the interlacing of cotton knitted fabric on the lightfastness of colours obtained by reactive dyes was studied. Practical  value.  According  to  the  results  of  the  study,  interlacing  of  cotton  knitted  fabric  were determined,  which  provide  colours  with  reactive  dyes  with  high  resistance  to  light  exposure,  as  well  as interlacing, which require light-shielding treatment under the same conditions.