Thesis Details

Thesis Title: Effect of cotton maturity as measured by the HVI near infrared reflectance analysis (NIRA) maturity tester on ring spun yarn characteristics
Thesis Author: Robert Keller
Abstract: with the continuing widespread use of high volume instrumentation (HVI), manufacturing plants now have access to information about cotton in the laydown that was not easily available only a few years ago. So revolutionary is the high volume instrumentation system that the united States Department of Agriculture (USDA) is changing the system of cotton grading, beginning in 1991, to one centered around HVI use. The USDA has resolved to discover a quick, reliable method for testing cotton maturity, which to this point has not been available on the system. The advent of the HVI near infrared reflectance analysis (NlRA) maturity tester was developed at the Institute of Textile Technology for the purpose of providing manufacturing plants with information on cotton maturity without another laboratory process. with the ability to detect changes in cotton maturity, potential problems in yarn manufacturing, fabric formation, and wet processing may be avoided. The first part of this work was to determine the relationships between the HVI NlRA unit and the Technicon InfraAlyzer 400, IIC-Shirley Fineness/Maturity Tester Model II, and the IIC-Shirley Fineness/Maturity Tester Model III. In each case, a low correlation coefficient, but high predictability, was the result. Due to poor correlations and processing difficulties with the HVI NlRA unit, further analysis in this work was conducted using data from the Technicon InfraAlyzer 400 and IIC-shirley FMT Model II. To determine the relationships between the ring spun yarn characteristics and the InfraAlyzer and Shirley FMT Model II, a multiple regression analysis was used with other fiber properties. Relationships were derived with low risk factors. The final portion of this research involved correlating the dye uptake of knitted fabric to InfraAlyzer and FMT II maturity. Again, a low correlation coefficient was the result, but at a 99.9% confidence level. From statistical analysis of test data, it was surmised that changes can be made to the experimental HVI NlRA unit to improve its usefulness in cotton classing and textile manufacturing. certain flaws which exist in the software of the instrument will be corrected prior to market introduction and other design changes will facilitate ease of operation and reliability of data. The HVI NlRA instrument is essentially useful, but remains in a developmental phase. Once the software and design changes are enacted, an exciting new dimension shall be added to the HVI line.