Effect of acid swelling and its impact on the properties of cow industrial glove leathers / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 6 (06/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 6 (06/2023) . - p. 235-244 Titre : Effect of acid swelling and its impact on the properties of cow industrial glove leathers Type de document : texte imprimé Auteurs : Murali Sathish, Auteur ; Palanisamy Thanikaivelan, Auteur ; Nayan Sarkar, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2023 Article en page(s) : p. 235-244 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides organiques Colorimétrie Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés thermiques Cuirs et peaux de bovins Gants Gonflement (physique) Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Post-tannage Stabilité thermique Tannage au chrome Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The development of commercially successful salt-free chrome tanning technology is the need of global leather sector to reduce the total dissolved solids in wastewater. Though some attempts have been made to develop salt-free chrome tanning technology, drawbacks such as slow diffusion of chromium, unevenness in softness and other organoleptic properties are the major concern. The generation of localized acid swelling might be a reason for the above drawbacks and no scientific literature available for the same. Hence, it is important to analyze the effect of acid swelling and its impact on the diffusion of chromium, ageing characteristics of wet-blue leather and physical properties of crust leather. The results show that the acid swelling delays the diffusion of chromium in tanning process and also enhances the growth marks on wet-blue leather. The ageing study reveals that the wet-blue obtained from acid swollen system dehydrates faster than the conventional salt based chromium tanning system. In addition, the wet-blue leather from acid swollen system is prone to fungal attack. The industrial glove leather obtained from acid swollen system has reduced strength characteristics viz., 15% reduction in tensile strength, 17% reduction in tear strength and 20% reduction in grain crack/bursting strength. Further, the degree of heterogeneity in softness is high for crust leather obtained from acid swollen system and also more looseness with internal emptiness. Color value measurements reveal that the crust leather obtained from the conventional tanning system is lighter in shade than the acid-swollen system. The results will be useful to design commercially viable salt-free or low-salt tanning systems as well as to tackle the inadvertent industrial scenario where the tanners are looking for solutions for accidental acid swelling and subsequent salvage of the leathers for possible recovery and applications. Note de contenu : - INTRODUCTION : Pickling with non-sweeling acid - Pre-treatment with weak organic acid - MATERIALS AND METHODS : Chromium tanning and post-tanning process - Analysis of thermal stability - Ageing characteristics of wet-blue leather - Microscopic analysis - Physical strength characteristics and organoleptic properties - Color value measurements - Table 1 : Process recipe for tanning the delimed cow pelts - Table 2 : Process recipe for the manufacture of cow industrial glove leather from chrome tanned cow wet blue (Thickness: 1.0-1.1 mm) - Table 3 : Changes in weight of cow pelts and leathers - Table 4 : Changes in thickness and area of cow pelts and leathers - Table 5 : Hydrothermal shrinkage temperature at different processing stages - Table 6 : Physical properties of crust leathers - Table 7 : Organoleptic properties of crust leathers - Table 8 : Color value measurement of wet-blue and crust leather DOI : https://doi.org/10.34314/jalca.v118i6.7657 En ligne : https://drive.google.com/file/d/1oHLiX_RkSCNDjpuZpyhxxvz0C-oPiGFq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39480 [article]

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