Storage qualities of wet-blue leathers / Alan E. Russell in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 41-48 Titre : Storage qualities of wet-blue leathers Type de document : texte imprimé Auteurs : Alan E. Russell, Auteur ; Desmond R. Cooper, Auteur Année de publication : 1975 Article en page(s) : p. 41-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de tannage -- Teneur en chrome Cuirs et peaux -- Analyse Durée de stockage pH Stabilité chimique Stabilité physique Température Wet-blue -- Stockage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The physical and chemical stability of low-chrome wet-blue stock was investigated at various storage pH values, temperatures and times. Chrome contents were varied between 20% and 80% of normal tannage to determine minimum levels required to protect the hide structure from bacterial and hydrolytic damage Behaviour of the leathers under storage was assessed from physical tests on the leathers in the wet condition as well as after fatliquoring and drying and from analysis of the interstitial liquor for free chrome and nitrogen. A feature of the results was the comparative stability of the tanned stock under storage at all levels of chrome content. Shifts in physical properties with chrome content were normal trends, while increases observed in grain extension at crack, slit tear and lastometer loads after storage represented beneficial changes. The low levels of soluble nitrogen and chrome in the leather liquors throughout storage indicated that degradation of the hide structure or breakdown of the chrome complexes in the hide was minimal. The experimental results demonstrate the feasibility of extended storage of wet-blue at extremely low levels of chrome application. Note de contenu : - EXPERIMENTAL DESIGN : Statistical design - Preparation of wet-blue leathers - RESULTS : A)Changes in leather liquors during storage - B) Examination of leathers in the wet condition - C) Examination of finished leathers - Summary of significant changes in physical tests - Table 1 : Chrome content of liquors (ppm) AB x C chrome offered x initial pH (***) - Table 2 : Change in liquor chrome content (ppm) AB x D chrome offered x storage temperature (**) - Table 3 : Property : Shrink. Temp. Change on drying. Unit : Degree cent ABC chrome offered x storage pH (**) - Table 4 : Property : Load at break (wet leathers). Unit : MPa ABE chrome offered x storage time (**) - Fig. 1 : Variation in chrome content of wet-blue leathers with chrome offered - Fig. 2 : Variation in shrinkage temperature of wet-blue leathers with amount of chrome offered - Fig. 3 : Variation of shrinkage temperature of wet-blue leathers with chrome content En ligne : https://drive.google.com/file/d/1bmEsGz0HXovXZcRO8GbJKanKUvNQ_Kpl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35299 [article]

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