Quantification of fiber quality in Egyptian cotton varieties and promising crosses

Quantification of the quality of cotton fiber is an interesting field of textile research because of cotton may have conflicting standards in terms of different fiber quality. Therefore, the ranking or grading of cotton fibers in terms of different quality will certainly not be the same. The solution should imply an index of quality of cotton fiber (quantitative measurements), and the index should incorporate all the important fiber properties, also that fiber properties should be commensurate with their importance on the final yarn quality. Therefore, it is imperative in this investigation to quantify the quality of cotton fiber by using the methods, premiumdiscount index (PDI), fiber quality index (FQI) and Spinning consistency index (SCI). The most important results were 1- Based on the percentage contribution of fiber property (Ci %) and the difference factor (Di), the premium-discount index (PDI) could be calculated using the following equation PDI = 3.88 (D UHML) + 2.48 (D FS) - 4.81 (DSFC) - 7.75 (Doric) 2- The % contribution (Ci %) cleared that, the most positive %contribution to carded ring skein strength was Upper Half Mean Length (UHML), on the contrary, Short Fiber Content (SFC) was the most negative % contribution, in next from the standardised 'P' coefficient values in the premium-discount index equation (PDI) we can receive a clear idea of the influence of fiber properties on skein strength. 4- Values of Spearman rank correlation (Re) cleared that, the differences between the three methods PDI, SCI, FQI were marginal, beside the highest values of (RS) were in favor of Premium-Discount Index (PDI). 5- The model of Premium-Discount Index (PDI) can be used in quantification of cotton fiber quality, and estimating skein strength values by using the regression equation which belongs it within Rz = 0.82.