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

Kan CW, Au CH - PLoS ONE (2015)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.

ABSTRACT
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. In-vitro 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.

No MeSH data available.


Related in: MedlinePlus

UPF values of various fabrics in red colour.
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pone.0133416.g002: UPF values of various fabrics in red colour.

Mentions: The relationship between lightness of fabrics and UPF is shown in Fig 11. It can be observed that UPF value is negatively related to L* value and is dependent on dye concentration. The lighter the colour of the fabric, the lower the UPF value is. For example, in case of combed twist 30Ne fabric samples dyed with reactive red dye, its CIE L* value decreases from 74.8 to 58.9 and then further to 44.3 when dye concentration increases from 0.1% to 1% and then to 5%. Fig 2 shows that UPF value of this fabric (i.e. combed twist 30Ne reactive dyed red fabric) increases from 11.67 to 30.40 when dye concentration increases from 0.1% to 5%. CIE L* value affects UV transmittance in both UVA and UVB regions as dye concentration affects both the reflectivity and the absorption of UV photons when the dye molecules are present on the fabric. When developing and choosing fabrics with UV protection ability, dyes that generate colours with small CIE L* values are recommended. However, colour must be considered in combination with other physical properties known to enhance the UV transmission.


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

Kan CW, Au CH - PLoS ONE (2015)

UPF values of various fabrics in red colour.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4519329&req=5

pone.0133416.g002: UPF values of various fabrics in red colour.
Mentions: The relationship between lightness of fabrics and UPF is shown in Fig 11. It can be observed that UPF value is negatively related to L* value and is dependent on dye concentration. The lighter the colour of the fabric, the lower the UPF value is. For example, in case of combed twist 30Ne fabric samples dyed with reactive red dye, its CIE L* value decreases from 74.8 to 58.9 and then further to 44.3 when dye concentration increases from 0.1% to 1% and then to 5%. Fig 2 shows that UPF value of this fabric (i.e. combed twist 30Ne reactive dyed red fabric) increases from 11.67 to 30.40 when dye concentration increases from 0.1% to 5%. CIE L* value affects UV transmittance in both UVA and UVB regions as dye concentration affects both the reflectivity and the absorption of UV photons when the dye molecules are present on the fabric. When developing and choosing fabrics with UV protection ability, dyes that generate colours with small CIE L* values are recommended. However, colour must be considered in combination with other physical properties known to enhance the UV transmission.

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.

ABSTRACT
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. In-vitro 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.

No MeSH data available.


Related in: MedlinePlus