Near Infrared Measurement of Cotton Fiber Micronaire, Maturity and Fineness - a Comparative Investigation

Textile Research Journal

Fortier

Montalvo

et al. 2010

Self Cite

In the U.S.A., cotton is classed (primary quality parameters) by the Uster ® High Volume Instrument (HVI), which must be maintained under tightly controlled laboratory environmental conditions. Improved and fast response quality measurement systems and tools are needed to rapidly assess the quality of cotton. One key area of emphasis and need is the development and implementation of new fast-response quality measurements that can be used not only in the laboratory but which also can be adapted to field and at-line quality measurements. A program was implemented to determine the ability of portable nearinfrared (NIR) instrumentation to monitor critical fiber properties of cotton samples in the laboratory, at-line, and in the field, with initial emphasis on the laboratory measurement of cotton fiber micronaire. Micronaire is a key cotton property, and it is an indicator of the fiber's maturity and fineness. Distinct NIR spectral differences between samples with varying micronaire were observed. A comparative evaluation was performed to determine optimum instrumental conditions for laboratory cotton micronaire measurements. The comparative evaluation established that the optimum instrumental conditions for laboratory measurements of micronaire was obtained with the use of a glass-covered sampling port and increased instrumental gain, with high R 2 values, low residuals, and with ≤ 12% outliers. For a NIR measurement with potential for multiple simultaneous analyses and non-laboratory measurements, the micronaire measurement was fast (< 3 min per sample) and easy to perform. The rapid and accurate laboratory measurement of cotton fiber micronaire with portable NIR instrumentation was demonstrated.

mentioning

confidence: 99%

Near Infrared Measurement of Cotton Fiber Micronaire by Portable Near Infrared Instrumentation

Textile Research Journal

Fortier

Montalvo

et al. 2010

Self Cite

“…The amount of light reflected or transmitted is dependent of both chemical (molecular absorbance) and physical (scattering/reflective) properties of the sample, and they arise from the overtones and valence vibrations of XH n , groups or combination of the valence and bending vibration of such groups (CH n , NH n , and OH). 6,7 According to Liu et al 8 and Rodgers et al 9 the broad absorptions between approximately 1150-1300 nm are from the second overtones of CH stretching modes, and their first overtones appear in the spectral region of approximately 1675-1860 nm. The absorptions between the spectral region of approximately 1300-1400 nm is ascribed to combination bands of CH n vibrations, and the absorptions between the spectral regions of approximately 1400-1500, 1900-2000, and 2050-2250 nm are due primarily to OH overtone and combination bands.…”

Section: Near-infrared Overviewmentioning

confidence: 99%

“…Typical NIR absorbance spectra for cotton fibers are presented in Figure 3. The primary 9 Spectral differences were observed for the MicroNIR 2200 NIR absorbance spectra, especially between the baselines for the spectra (Figure 3). The spectra differences were not in the order of increasing micronaire; one rationale for the mis-order of spectra with micronaire was the shifts in the spectrum baselines.…”

Section: Micronir 2200mentioning

confidence: 99%

“…Rodgers and colleagues examined the ''universal'' nature of the NIR measurement of micronaire with four different bench-top scanning instruments on a common sample set of samples with a wide micronaire range. 9 The four NIR instruments included both dispersive and Fourier transform near-infrared (FT-NIR) units with an overall spectral range of approximately 800-2500 nm. For micronaire, very similar results were observed between the four bench-top instruments, with low residuals (<0.15) and R 2 s in the range of 0.91-0.98.…”

Section: An Overview Of Cotton Fiber Micronaire Measurements By Near-mentioning

confidence: 99%

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Cotton Micronaire Measurements Using Small Portable Near-Infrared (NIR) Analyzers

Zumba

2016

Appl Spectrosc

Self Cite

A key quality and processing parameter for cotton fiber is micronaire, which is a function of the fiber's maturity and fineness. Near-infrared (NIR) spectroscopy has previously shown the ability to measure micronaire, primarily in the laboratory and using large, research-grade laboratory NIR instrumentation. International interest has been expressed by the industry in the measurement of fiber micronaire using small, portable NIR spectroscopy instruments for both laboratory and outside the laboratory (e.g., field or greenhouse) locations. New, very small NIR micro-spectrometers have been commercialized that offer the potential advantages of smaller size and lower weight, lower cost, and increased portability over current portable units. A program was implemented to determine the feasibility of a small NIR microspectrometer to measure fiber micronaire both in the laboratory and outside the laboratory, with initial emphasis on laboratory measurements prior to moving to field evaluations. In the laboratory, distinct spectral differences with increasing micronaire were observed. Optimal sampling and instrumental procedures and protocols for two units (different spectral wavelength capabilities) were established. Comparative evaluations established very good method micronaire agreement between the micro-spectrometer and a standard portable spectrometer, with high Regression (R) value, low residuals, and few outliers (less than 20%). The NIR micro-spectrometer measurements were fast (<1 min per sample), required no sample preparation, and were easy to perform. All end-state criteria were exceeded. The rapid and accurate laboratory measurement of fiber micronaire with a NIR micro-spectrometer was demonstrated.

“…Another examination quite beneficial to the textile industry provided an overview on the analysis of textiles using NIR [13]. NIR spectroscopy has been used to quantitatively measure cotton quality parameters, both in and outside the laboratory [14][15][16][17][18][19][20]. Blend analyses, which include determining cotton content, have been performed with NIR spectroscopy [21,22].…”

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confidence: 99%

Preliminary Examinations for the Identification of U.S. Domestic and International Cotton Fibers by Near-Infrared Spectroscopy

Fortier

2014

Fibers

Self Cite

Abstract:Cotton is and has been a large cash crop in the United States and abroad for many years. Part of the widespread interest and utility of this product is due to its attractive chemical and physical properties for use in textiles. The textile industry could benefit from the presentation of a quick, reliable method to classify U.S. from foreign cottons so that the appropriate tariffs can be levied for non-American cottons. In addition, there is some interest in avoiding cotton identity theft. Thus, an accurate and precise instrumental method would be of interest to correctly identify the country of origin of cotton. This study provides an analytical method to identify domestic and foreign cotton fibers using near-infrared (NIR) spectroscopy coupled with principal component analysis (PCA). Samples from American cottons were evaluated along with a representative amount of international samples. The results provide a proof of concept that indicates that PCA analysis can be used to separate the respective domestic and foreign cotton groups.