Combination tannages with vegetable tannins and aluminium / Juan F. Hernandez in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIX (Année 1984)

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXIX (Année 1984) . - p. 182-206 Titre : Combination tannages with vegetable tannins and aluminium Type de document : texte imprimé Auteurs : Juan F. Hernandez, Auteur ; Waldo E. Kallenberger, Auteur Année de publication : 1984 Article en page(s) : p. 182-206 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tannage with a polyphenolic substance followed by the application of dissolved metal salt, specifically vegetable tannins followed by aluminium salts, produces unexpectedly high thermal stability and acid resistance in the final leather. Several explanations have been proposed for these observations, but none realistically account for the synergestic effect, or the specific need to apply the tannage carefully using polyphenolic first followed by the application of metal salt. By demonstrating through laboratory experiments the need to modify the more traditional ideas about straight mineral tannage with respect to the effect of the metal salt reaction, a new, more logical concept of polymer formation is developed and supported through laboratory experimental evidence. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9373 [article]

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Comparative tanning ability of extracts from four north american species of acacia / David. S. Seigler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIV (Année 1989) . - p. 315-322 Titre : Comparative tanning ability of extracts from four north american species of acacia Type de document : texte imprimé Auteurs : David. S. Seigler, Auteur ; Juan F. Hernandez, Auteur Année de publication : 1989 Article en page(s) : p. 315-322 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acacia et constituants Etudes comparatives Tannage végétal Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The percentages of tannins in four common Acacia species, A. berlandieri, A. farnesiana, A. greggii, and A. rigula and the efficacy of these tannins for the production of leather have been determined. Tannins were extracted with 70% acetone-water. Hide samples were treated in the conventional manner and suspended in tannin solutions. Tannins from A. farnesiana, A. berlandieri and A. rigidula penetrated the hide in 9 days and grave acceptable color. The yields of leather were best for A. rigidula and A. greggii. Water-soluble portions of the aqueous-acetone extracts of wattle. Tannins from A. greggii occur in too small amounts to be useful and have some undesirable properties. Because of the widespread distribution and abundance of these plants, they may have potential as sources for commercial tannins. Note de contenu : - EXPERIMENTAL : Plant materials - Extraction of bulk collections - Solubilization of the insoluble fractions - Determination of tannin content and other parameters - Tanning of hide samples En ligne : https://drive.google.com/file/d/1ehdoJhpP4rYFy_mhBVqFTeke5b_ch0Db/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17369 [article]

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