Characterization of alligator, ostrich and emu skins and comparisons to traditional leathers

Exotic skins and leathers have enjoyed a recent resurgence, as current fashion magazines illustrate. Louisiana would like to increase its niche in the exotic skins market by increasing alligator, ostrich and emu skin usage, mainly by inspiring designers to incorporate them into their repertoire. The possibilities are endless from apparel and trim to upholstery and other home furnishings to accessories; Louisiana exotic skins have significant market potential. In order to assist in these traditional textile applications, characterization of the various skin properties needs to be completed. The research was carried out in three stages. For the preliminary research, one emu skin was thoroughly tested by standard and modified methods to characterize the physical properties of the skins. In the second phase, testing techniques determined effective for emu skin were used to measure properties of alligator skins. As a result, a database of physical properties was created that permitted comparisons of the exotic skins to their more traditional leather counterparts. The final stage of the research was to test ostrich and traditional leathers by the established methods and perform statistical comparisons of the skins, to compare exotic to traditional leather. There were very few significant differences between the exotic and traditional leathers. Finish had an impact on the performance of the skins. Garment finished skins were more extensible than skins with classic finishes, had a softer hand and less stiffness. Deer, pig and cowhide had higher tensile extensilbilities than the alligator skins, which were stiffer. In colorfastness testing, alligator and ostrich samples were similar to cowhide, goat and buffalo, and superior to suede, deer, lamb and pig in staining fibers with which the skin was in contact during dry-cleaning. Based on their similar physical properties, the exotic skins can successfully be substituted for their more traditional counterparts. If destruction of a hide is not an option, preliminary research indicates that NIR can predict Young’s modulus as measured by the tensile test, which can be correlated to other physical properties

TEXTILE TECHNOLOGY Modeling of Water Content in Cotton Before and After Cleaning With the Shirley Analyzer

ABSTRACT The role of botanical trash in the observed water content of ginned cotton has not been elucidated. Recently, a reference method for water content in raw and cleaned cottons based on Karl Fischer Titration was evaluated. The objective of this study was to compare -by modeling and Karl Fischer Titration -the water content in lint from two cultivars before and after mechanical cleaning with the Shirley analyzer. Models were developed as a function of the mass fraction of the aggregate trash removed in cleaning, and the water contents in the trash and cleaned cotton. Water content was also measured in the isolated trash after correction for entrained lint. The grand means in water content across both cultivars were : raw, 7.83%; after cleaning, 7.73%; and trash, 14.81%. Thus, the directly measured grand means difference in water content before and after cleaning was only 0.10%. This compared well with the predicted difference from modeling using the averaged mass fraction of isolated trash of 0.0135 from published work on six cottons. The water content in the trash particles was about twice that of the cleaned fibers; the mass fraction of trash was minute. Clearly, the mass fraction of impurities is the controlling factor in establishing the difference in water content before and after cleaning. Although only a limited number of cultivars were studied, these data suggest a decrease in water content of < 0.5% due to removal of botanical trash in screening studies from the bale to the yarn

Comparison of image analysis systems for their ability to detect the white speck phenomenon

M.S.Mary Lynn Realf

Infrared Imaging of Cotton Fiber Bundles Using a Focal Plane Array Detector and a Single Reflectance Accessory

Infrared imaging is gaining attention as a technique used in the examination of cotton fibers. This type of imaging combines spectral analysis with spatial resolution to create visual images that examine sample composition and distribution. Herein, we report on the use of an infrared instrument equipped with a reflection accessory and an array detector system for the examination of cotton fiber bundles. Cotton vibrational spectra and chemical images were acquired by grouping pixels in the detector array. This technique reduced spectral noise and was employed to visualize cell wall development in cotton fibers bundles. Fourier transform infrared spectra reveal band changes in the C–O bending region that matched previous studies. Imaging studies were quick, relied on small amounts of sample and provided a distribution of the cotton fiber cell wall composition. Thus, imaging of cotton bundles with an infrared detector array has potential for use in cotton fiber examinations

Hydrogen Peroxide Generation of Copper/Ascorbate Formulations on Cotton: Effect on Antibacterial and Fibroblast Activity for Wound Healing Application

Greige cotton (unbleached cotton) is an intact plant fiber that retains much of the outer cotton fiber layers. These layers contain pectin, peroxidases, and trace metals that are associated with hydrogen peroxide (H2O2) generation during cotton fiber development. When greige cotton is subjected to a nonwoven hydroentanglement process, components of the outer cotton fiber layers are retained. When hydrated, this fabric can generate H2O2 (5–50 micromolar). This range has been characterized as inducing accelerated wound healing associated with enhanced cell signaling and the proliferation of cells vital to wound restoration. On the other hand, H2O2 levels above 50 micromolar have been associated with bacteriostatic activity. Here, we report the preparation and hydrogen peroxide activity of copper/ascorbate formulations, both as adsorbed and in situ synthesized analogs on cotton. The cooper/ascorbate-cotton formulations were designed with the goal of modulating hydrogen peroxide levels within functional ranges beneficial to wound healing. The cotton/copper formulation analogs were prepared on nonwoven unbleached cotton and characterized with cotton impregnation titers of 3–14 mg copper per gram of cotton. The copper/ascorbate cotton analog formulations were characterized spectroscopically, and the copper titer was quantified with ICP analysis and probed for peroxide production through assessment with Amplex Red. All analogs demonstrated antibacterial activity. Notably, the treatment of unbleached cotton with low levels of ascorbate (~2 mg/g cotton) resulted in a 99 percent reduction in Klebsiella pneumoniae and Staphylococcus aureus. In situ synthesized copper/ascorbate nanoparticles retained activity and did not leach out upon prolonged suspension in an aqueous environment. An assessment of H2O2 effects on fibroblast proliferation are discussed in light of the copper/cotton analogs and wound healing