4. Conclusions
In the case of the two disperse dyes on the nonwoven, knitted and woven PET fabrics, the colour strength of the dyeings followed the order: nonwoven >> knitted > woven. Differences in surface reflection were considered to be not responsible for the fk behaviour, as the PET fibres employed in the construction of the nonwoven, knitted and hydroentangled woven fabrics were of similar fineness; furthermore, all three types of PET fabric comprised fibres of broadly similar specification (w37e40 mm mean fibre length and circular cross section). Despite differences in the degree of crystallinity (xc) between the different types of PET fabrics, the magnitude of these differences did not explain the observed differences in fk values; in a similar manner, variations in
melting temperature (Tm) recorded for the three PET fibres were not deemed to be influential in terms of the trends in observed