Methods for Determination of Dyeing Properties of Polyester Fibres

Abstract

A comparison of dyeing properties of polyester fibres of various producers by dyeing with disperse dyestuffs (Orbodispers plava S-BGL) in dependence on the temperature of dyeing, with or without a carrier, is presented in this paper. For the quantity of dyestuff in the fibre and for the colour intensity two methods were used and compared: dyestuff extract from the fibre with NN-dimethyl formamide and registering of reflectance spectra of dyed patterns. It was found out, that the analytic method of dyestuff removing from the dyed patterns with NN-dimethyl formamid is not reliable if dyeing with a carrier. Method of registering of reflectance spectra is reliable disregarding the method used (with and without a carrier). The results obtained showed that the differencies among the investigated polyester fibres can be obtained if dyeing at the temperature of 100 °C. The differencies in the colour intensity of the investigated samples become insignificant at the temperature of 115 °C and more. If dyeing is carried out with a carrier, the differencies are insignificant at the temperature of 105 °C. It was found out, that among three polyester fibres (Vartilen, Grilen, Maklen) Vartilen and Grilen, are sensitive to the temperatures of dyeing, while Maklen shows an excellent receptivity for dyes at the dyeing temperature of 100 °C.