Analysis of the Effect of Constructional Parameters and Dye Class on the UV Protection Property of Cotton Knitted Fabrics

201810_a bcmaVersion of RecordPublishe

Profile plots showing the interaction effect of fibre type with (a) yarn spinning method, (b) fineness of yarn, (c) dye concentration, (d) dye class, and (e) colour.

<p>Profile plots showing the interaction effect of fibre type with (a) yarn spinning method, (b) fineness of yarn, (c) dye concentration, (d) dye class, and (e) colour.</p

Profile plots showing the interaction effect of colour with (a) types of fibre, (b) yarn spinning method, (c) yarn fineness, (d) dye concentration, and (e) dye class.

<p>Profile plots showing the interaction effect of colour with (a) types of fibre, (b) yarn spinning method, (c) yarn fineness, (d) dye concentration, and (e) dye class.</p

Results of Post hoc tests showing the comparisons of fabrics made with 30Ne and 40Ne yarn under the interaction effect of other variables.

<p>* The mean difference is significant at the 0.05 level.</p><p>Results of Post hoc tests showing the comparisons of fabrics made with 30Ne and 40Ne yarn under the interaction effect of other variables.</p

UPF values of various control fabrics (without dyeing).

<p>UPF values of various control fabrics (without dyeing).</p

Results of Post hoc tests showing the comparisons of fabrics treated with 0.1% dye, 1% dye and 5% dye under the interaction effect of other variables.

<p>* The mean difference is significant at the 0.05 level.</p><p>Results of Post hoc tests showing the comparisons of fabrics treated with 0.1% dye, 1% dye and 5% dye under the interaction effect of other variables.</p

Results of Post hoc tests showing the comparisons of fabrics made with reactive dye, direct dye and sulphur dye under the interaction effect of other variables.

<p>* The mean difference is significant at the 0.05 level.</p><p>Results of Post hoc tests showing the comparisons of fabrics made with reactive dye, direct dye and sulphur dye under the interaction effect of other variables.</p

<i>In-Vitro</i> Analysis of the Effect of Constructional Parameters and Dye Class on the UV Protection Property of Cotton Knitted Fabrics

<div><p>Cotton knitted fabrics were manufactured with different yarn types (conventional ring spun yarn and torque-free ring spun yarn) with different fibre types (combed cotton and combed Supima cotton) and yarn fineness (Ne30 and Ne40). These fabrics were then dyed with three types of dye (reactive, direct and sulphur dye) with three dye concentrations (0.1%, 1.0% and 5.0% on-weight of fabric (owf)) in three colours (red, yellow and blue). This study examined the impact of constructional parameters and dyeing on ultraviolet (UV) protection properties of cotton knitted fabric. <i>In-vitro</i> test with spectrophotometer was used for evaluating the UV protection property of dyed cotton knitted fabrics. Among the six parameters investigated, fineness of yarn and dye concentration were the most significant factors affecting UPF while the color effect is the least significant. Experimental results revealed that the UPF value of dyed fabrics made from combed cotton is generally higher than the combed Supima cotton since combed cotton is composed of shorter fibres which facilitate the blocking or absorption of UV radiation. Second, fabrics made with twist yarn (i.e. ring spun yarn) have higher UPF value than the corresponding ESTex one (i.e. torque-free yarn) in general since fabrics made with ring spun yarn tend to shrink during wet processing and so it is more compact. Third, the UPF value of fabrics made with 30Ne yarn was higher than the 40Ne one since it is thicker and has lower fabric porosity. Fourth, fabrics dyed with lower concentration of dye gave the lowest UPF. Fifth, the sulphur dyed samples performed worse than the reactive and direct dyed samples in terms of UV protection property. Sixth, there is no significant difference in UPF for red, yellow and blue coloured fabrics. Seventh, this study also demonstrated that lightness of fabric is negatively related to UV protection property.</p></div

Profile plots showing the interaction effect of dye concentration with (a) types of fibre, (b) yarn spinning method, (c) yarn fineness, (d) dye class, and (e) colour.

<p>Profile plots showing the interaction effect of dye concentration with (a) types of fibre, (b) yarn spinning method, (c) yarn fineness, (d) dye class, and (e) colour.</p