Titre : |
Do leather anisotropic properties have an effect on shrinkage temperature ? |
Type de document : |
texte imprimé |
Auteurs : |
Ewa Marcinkowska, Auteur ; Gabriela Zielinska, Auteur |
Année de publication : |
2018 |
Article en page(s) : |
p. 163-171 |
Note générale : |
Bibliogr. |
Langues : |
Américain (ame) |
Catégories : |
Anisotropie Chrome Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Essais dynamiques Glutaraldéhyde Statistique Tannage Température de retrait Traction (mécanique)
|
Index. décimale : |
675 Technologie du cuir et de la fourrure |
Résumé : |
Herein are the results of studies of mechanical properties and shrinkage temperature of cowhide leather tanned with modified glutaraldehyde and chrome. The tests were carried out on samples cut from both kinds of leather parallel and perpendicular to the backbone. The aim of these studies was determining whether the sample orientation to the backbone, thus leather anisotropic properties defined by its tensile strength and ultimate extension, has an effect on shrinkage temperature and kinetics of this process.
Mechanical properties were tested according to PN-EN ISO 3376:2012 Leather – Physical and mechanical tests – Determination of tensile strength and percentage extension. The conditions for shrinkage temperature measurements were set according to guidelines specified in PN-EN ISO 3380:2015-11 Leather – Physical and mechanical tests – Determination of shrinkage temperature up to 100°C. The experiment was carried out by using an instrument of our own design enabling automatic recording of leather specimen length changes during measurement.
The results of mechanical tests allowed the determination of the degree of differentiation of obtained tensile strength and ultimate extension values depending on test sample orientation to the backbone. For leather tanned with modified glutaraldehyde the coefficient of variation with respect to tensile strength in both directions was 0.31, while for chrome tanned leather was 0.44. The coefficient of variation for ultimate extension calculated for both directions was 0.55 and 0.42 for glutaraldehyde and chrome tanned leathers, respectively.
The slope of obtained regression lines was compared to find any statistically significant differences in leather shrinkage rate depending on orientation to the backbone. The results of analyses performed for two differently tanned leathers show no statistically significant differences in shrinkage rate depending on cut orientation. Thus, anisotropy of mechanical properties of leather samples under investigation does not affect both shrinkage temperature and the rate of this process. |
Note de contenu : |
- MATERIAL
- METHODS : Mechanical properties test method - Method to measure and analyze leather shrinkage temperature - Methods of statistical analysis
- TABLES : 1. Tensile strength and ultimate extension for themodified glutaraldehyde-tanned leather - 2. Tensile strength and percentage extension for the chrome-tanned leather - 3, 4, 5, 6 - Summary results of fitting a model y=A*+B at α = 0.05 |
En ligne : |
https://drive.google.com/file/d/1CtzGHhwPpBlMy9Wp8yw3WGOKxayuLAE5/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30534 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 5 (05/2018) . - p. 163-171