Comparative study of colour yield of cotton knitted fabric made by torque‐free ring‐spun yarns

Textile Research Journal

Wong

2010

Torque-free ring spinning is a new spinning technology that produces yarns with low twist and balanced torque. This study examined whether the impact of cellulase treatment was different on denim fabrics having torque-free ring spun yarn in the warp direction. Commercially produced torque-free ring spun cotton yarn was used for manufacturing denim fabric. One specimen of denim fabric had torque-free ring spun yarn in the warp direction and conventional ring spun yarn in the weft direction while the other had normal conventional ring spun yarn in both warp and weft directions. Both warp yarns of the fabrics were dyed with the same indigo dyeing process. The denim fabric samples were treated with neutral cellulase under the same conditions, and weight change and color properties, such as reflectance, K/S value, CIE Lab values, and color fastness ratings, were measured. Experimental results showed that the weight loss percentages of the denim fabric samples after cellulase treatment were very similar. The specimen with torque-free ring spun yarn in the warp direction produced a lower reflectance value and higher color yield compared with the specimen with conventional ring spun yarn in both warp and weft directions. Meanwhile the denim fabric manufactured by torque-free ring spun yarn demonstrated a larger color difference but no significant effect on colorfastness properties after cellulase treatment.

Section: Reflectance Curvementioning

confidence: 98%

“…Sample 1 and 2 denim fabrics have similar fabric constructions and the only difference is that the sample 2 warp yarn is bulkier due to its low-twist characteristic. The dye uptake of the sample 2 denim fabric is better because the yarn is bulkier, 14 providing more accessible surface area for dye particles.…”

Section: Cie Color Coordinatesmentioning

confidence: 99%

Color properties of cellulase-treated cotton denim fabric manufactured by torque-free ring spun yarn

Textile Research Journal

Wong

2010

“…Post hoc test, shown in Table 6 , suggests that fabrics made with twist yarn have higher UPF value than the corresponding ESTex one irrespective of yarn fineness (p<0.05). ESTex yarn, a commercial torque-free ring spun yarn, is produced by a new spinning technology which can produce low twist yarns with balanced torque [ 30 ] but broadly the same strength [ 31 – 33 ]. Table 6 also shows that the UPF value of twist-combed Supima cotton fabric is significantly higher than the corresponding ESTex-combed Supima fabric (p<0.05).…”

Section: Resultsmentioning

confidence: 99%

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

2015

PLoS ONE

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.

“…The higher the K/S value, the greater the dye uptake, resulting in better color yield. 14 Eq. 1 K is the absorption coefficient (dependent on colorant concentration), S is the scattering coefficient, and R is the reflectance of the dyed sample.…”

Section: Plasma Treatmentmentioning

confidence: 99%

Effect of Low Temperature Plasma Treatment on the Dyeability of Regenerated Bamboo/Cotton Blended Fabrics

Lam

2017

aatcc j res

In this research, regenerated bamboo (viscose)/cotton blended fabrics were treated with low temperature plasma under various treatment conditions (i.e., oxygen flow rate, jet-to-substrate distance, and plasma treatment time) to evaluate how these parameters influenced fabric dyeing properties. It was shown that low temperature plasma treatment can modify polymer surfaces and change the substrate's properties, such as wettability. In this study, plasma-treated fabrics were dyed with mono-functional and bi-functional reactive dyes to check for changes in CIELAB, ΔE*, and color yield values. The study concluded that color yield of the plasma-treated fabric was better when dyed to a color depth of 3%.