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Effect of chromium and tanning method on the drape of goat suede apparel leathers / K. Krishnaraj in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 3 (03/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 3 (03/2010) . - p. 71-77 Titre : Effect of chromium and tanning method on the drape of goat suede apparel leathers Type de document : texte imprimé Auteurs : K. Krishnaraj, Auteur ; B. Chandrasekaran, Auteur ; Palanisamy Thanikaivelan, Auteur Année de publication : 2010 Article en page(s) : p. 71-77 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux de chèvres Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tanning stabilizes the skin matrix permanently and is considered as the heart of leather processing. In commercial practice, vegetable and chrome tanning methods are widely employed. Between these two methods, chrome tanning is the most commonly used tanning method. Hence, it is logical to study the relationship between the chromium content and drape related properties of garment leathers. In this study, the bending length and drape parameters were measured for goat suede leathers with different chromium contents and analyzed. The goat suede leathers were prepared in three different ways namely full chrome (FC), semi chrome (SC) and full vegetable (FV) methods. Whereas FC and FV goat suede leathers had increasing drape coefficient values, the drape coefficient for SC goat suede leathers was the lowest in the range of 35.1±7.2 %. Further, softness, bending length and number of nodes for SC goat suede leathers were statistically superior in the stand point of drape ability compared to FC and FV goat suede leathers. Hence, it is validated that the semi chrome goat suede leathers possess better drape ability compared to full chrome as well as full vegetable goat suede leathers. Consequently, the presence of chromium in the leathers plays a major role in the draping ability of goat suede apparel leathers ; however, it is also infered that more amount of chromium in the leathers (FC) did not yield better drape ability. En ligne : https://drive.google.com/file/d/1JgOhogXe-emjSdEt5tW24YniW_hopZPc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8732 [article]

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An environmentally friendly leather-making process based on silica chemistry / Yuansen Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 3 (03/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 3 (03/2010) . - p. 84-93 Titre : An environmentally friendly leather-making process based on silica chemistry Type de document : texte imprimé Auteurs : Yuansen Liu, Auteur ; Chen Yi, Auteur ; Jian Yao, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur ; Biyu Peng, Auteur Année de publication : 2010 Article en page(s) : p. 84-93 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : An environmentally friendly leather process involving a lime-free liming process and a nano-SiO2 tanning process based on silica chemicals was investigated. The investigation included evaluation of the environment characteristics of this process, gelatin recovery from shavings together with the hydrothermal stability and mechanical properties of resultant leathers. The results indicated that the lime-free liming process based on sodium silicate and enzyme had an equivalent effect on fiber opening compared with conventional liming process. The physical strength and shrinkage temperature of the resultant leather tanned with nano-SiO2 were all higher than the stipulated chinese standards of chrome-free leather and were close to the chrome tanned leather control. More importantly, the lime sludge and chromium were at zero discharge because lime and chrome were not used in this experimental in this experimental proces. The total water consumption, raw shin basis, was decreased from 16.15L./Kg to 14.20L/Kg. At the same time, the values of biochemical oxygen demand (BOD5), the chemical oxygen demand (COD), the total nitrogen content (TNC) and total solids (S) in wastewater were all lower than the conventional process, showing reductions of 30 %, 45 %, 55 % and 72 %, respectively. BOD5/COD analysis revealed that the waste water from experimental treatment was more biodegradable than that of control treatment. Another interesting result was that the nano-SiO2 shavings produced in this process could be easily reused. High quality gelatin without chromium was obtained and large amount of water and chemical materials was saved in recovery process, so the secondary pollution caused by the traditional recovery of chrome shaving could be avoided. En ligne : https://drive.google.com/file/d/12yIYt3clTocc0TfDF3GZQ0P6CG6X2IxL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8733 [article]

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Thermal shrinkage effects on the mechanical behavior of leathers / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 3 (03/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 3 (03/2010) . - p. 94-99 Titre : Thermal shrinkage effects on the mechanical behavior of leathers Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Dominick J. Casadonte, Auteur ; Xuejing Zheng, Auteur ; Pengxiang Jia, Auteur ; Dennis C. Shelly, Auteur Année de publication : 2010 Article en page(s) : p. 94-99 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Thermal shrinkage will take place when leathers are heated to a high temperature, usually resulting in a decrease in its value and utility. In this paper, changes in mechanical behavior by thermal shrinkage of leathers are studied systematically for the first time, and the influencing mechanism of thermal shrinkage on the mechanical behaviors of leathers are investigated and analyzed. The results indicate that, by thermal shrinkage, the aperture ratios of leathers are decreased and such mechanical properties of leathers as elastic modulus, tensile strength, and elongation at break are increased. The improvement in mechanical behaviors by hydrothermal shrinkage is at the cost of loss of utility and economic value of leathers. The results indicate that shrunken leather may have a host of new applications because of their excellent mechanical behavior. En ligne : https://drive.google.com/file/d/1sjBf-VkgfBN_tLGI1ODfnNk76RaLpUfg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8734 [article]

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Cost effective fixing process for post tanning operation / N. N. Fathima in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 3 (03/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 3 (03/2010) . - p. 100-106 Titre : Cost effective fixing process for post tanning operation Type de document : texte imprimé Auteurs : N. N. Fathima, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2010 Article en page(s) : p. 100-106 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Post tanning is an important unit process in leather manufacturing because it imparts bulk properties to leather. Formic acid is used as a fixing agent during the post tanning operation for fixing the post tanning chemicals ; namely, dye, fatliquor and retanning agents. However, formic acid, being an organic acid, is expensive in nature. In order to make the fixing operation a cost effective process, replacement of formic acid by other mineral acids has been attempted in this study. Various combinations of organic and mineral acids were attempted to achieve the desired properties. Both sulfuric and hydrochloric acids have been used as fixing agents in the presence of formic acid either as serial addition or as combined addition. It has been observed that both the acids can be used for fixing in admixture with formic acid, with HCI giving slightly better organoleptic properties. Leathers obtained from various studies indicate that both sulfuric and hydrochloric acid in combination with formic acid resulted in properties comparable to that of the control leathers. Estimation of water solubles from experimental leathers indicated that the pH and leaching of dye are similar to that of the control leathers. No significant changes in the organoleptic and strength properties, and fiber structure of leathers were observed. Hence, fixing with a combination of mineral and formic acid is a feasible cost effective alternative for fixing of post tanning chemicals. En ligne : https://drive.google.com/file/d/1P9Tdn5HlHKdPiaYbTN5DtuqckWhFAnps/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8735 [article]

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