Lime-free unhairing : Part 2 / Virgilijus Valeika in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 3 (05-06/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 3 (05-06/1998) . - p. 95-98 Titre : Lime-free unhairing : Part 2 : Influence of added salts on NaOH unhairing and on hide properties Type de document : texte imprimé Auteurs : Virgilijus Valeika, Auteur ; J. Balciuniene, Auteur ; Kestutis Beleska, Auteur ; A. Skrodenis, Auteur ; V. Valeikienè, Auteur Année de publication : 1998 Article en page(s) : p. 95-98 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The influence of the system containing NaOH, Na2S and a salt such as NaCl, Na2SO4, HCOONa or Na2HPO4 on the properties of pelt in the unhairing process was investigated. The process of unhairing was separated into two stages : (i) degradation of the hair and (ii) opening up the dermal structure. The opening up stage was carried out in the liquor from the hair degradation after dilution with water. It was established that the above salts added to the solution for opening up the dermal structure influence the kinetics of the removed collagen and non-collagen proteins and also swelling of the hide. The supplementary use of salts is not convenient because it is more convenient to regulate the properties of the pelt by using a suitable quantity of water in the opening up the stage. The technology of lime-free production of pelt was developed based on the results of these investigations. Application of this technology of lime-free production of pelt was developed based on the results of these investigations. Application of this technology showed that the quality indexes of the garment leather produced using this method meet the manufacturer's requirements. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7901 [article]

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Use of NaOH for unhairing hides and the influence of the addition of salts on the process and on the hide properties / Virgilijus Valeika in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 2 (03-04/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 2 (03-04/1997) . - p. 65-69 Titre : Use of NaOH for unhairing hides and the influence of the addition of salts on the process and on the hide properties Type de document : texte imprimé Auteurs : Virgilijus Valeika, Auteur ; J. Balciuniene, Auteur ; Kestutis Beleska ; A. Skrodenis ; V. Valeikienè Année de publication : 1997 Article en page(s) : p. 65-69 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The influence of the system containing NaOH, Na2S and a salt such as NaCl, Na2SO4, HCOONa or Na2HPO4 on the properties of hair in the process of unhairing was investigated. The influence of alkaline process conditions such as concentration of NaOH and salt, temperature and duration of the process on the degradation of collagen and non-collagen proteins, the swelling and the quality of unhairing was also studied. It was established that addition of various salts influences the degree of opening up of the dermal structure. This is observed when the amounts of additional salts are not less than 4-5 % of NaCl, Na2SO4, HCOONa and 1-2 % of Na2HPO4. The unhairing efficiency decreased when these amounts of salts were used with the exception of NaCl. The temperature is of great importance. It must be no more than 30°C. The tendency towards swelling does not follow the tendency to destruction of the collagen. Under certain conditions of the alkaline treatment, the swelling decreases and degradation of collagen increases. The addition of various salts during alkaline treatment widens the range of possibilities of using NaOH for unhairing hides. En ligne : https://drive.google.com/file/d/1BfVgJjT0zJ7Xeo0SuMWdQWAc6-xDDgzj/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8054 [article]

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