Improved uptake of basic chromium salts in tanning operations using keratin hydrolysate / G. Ramamurthy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 73 (Année 1989)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 73 (Année 1989) . - p. 168-171 Titre : Improved uptake of basic chromium salts in tanning operations using keratin hydrolysate Type de document : texte imprimé Auteurs : G. Ramamurthy, Auteur ; Praveen Kumar Sehgal, Auteur ; Mahendra Kumar, Auteur Année de publication : 1989 Article en page(s) : p. 168-171 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Mineral tanning practices have become increasingly more common in recent years and there is increasing concern that chromium discharged in the effluent after chrome tanning may cause ecological problems. Keratin hydrolysate (KH) prepared from keratinous material like poultry feather and tannery hair is found to tanning and rechroming operations. In chrome tanning KH was added in the tanning bath after basification and in rechroming, KH was added in the same float either before or after rechroming. Control sets without KH were run simultaneously under identical conditions. All of the experiments were done on goat skins. Total chrome in the exhaust liquor and in the leather both before and after addition of KH was estimated for each set. Data on physical parameters of leather were also measured. It is also seen that the use of KH helps to reduce the percentage of syntans and fillers required for retanning. Using the data obtained from laboratory tests the process was scaled up in our tannery permitting us to assess the commercial aspects of the use of KH in leather processing. En ligne : https://drive.google.com/file/d/1wqtvm0tMcKIoYkUpuraX8PHCgP4LcxQj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8856 [article]

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Unhairing of goat skins by an alternative non-enzymatic and sulphide free process / Praveen Kumar Sehgal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 80, N° 3 (05-06/1996)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 80, N° 3 (05-06/1996) . - p. 91-92 Titre : Unhairing of goat skins by an alternative non-enzymatic and sulphide free process Type de document : texte imprimé Auteurs : Praveen Kumar Sehgal, Auteur ; G. Ramamurthy, Auteur ; Chellappa Muralidharan, Auteur ; K. B. Gupta, Auteur Année de publication : 1996 Article en page(s) : p. 91-92 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux Cuirs et peaux de chèvres Epilage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Goatskins have been unhaired using nickel carbonate instead of sodium sulphide. The skins were treated with a paste of 1 % nickel carbonate, 1 % sodium hydroxide, 3 % lime and a filler like kaolin or china clay plus water. The skins were covered and left for 16 h. at room temperature (28°C). The unhaired skins were further processed by conventional techniques and converted into crust leather. The results obtained are comparable with sulphide lime system in terms of duration and efficacy of the process. Unlike sodium sulphide unhairing, the skins unhaired with nickel carbonate have a natural colour and the crust leather was softer than the control leathers. En ligne : https://drive.google.com/file/d/1oXftqzG29Y8A9rzKgZcfwf3xF5GfwHhd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8155 [article]

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