Mathematical model of soaking. Part I / A. Blaha 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. 136-140 Titre : Mathematical model of soaking. Part I Type de document : texte imprimé Auteurs : A. Blaha, Auteur ; Karel Kolomaznik, Auteur Année de publication : 1989 Article en page(s) : p. 136-140 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper we describe the construction of a mathematical model of washing and of soaking salted raw hide materials. The methodology corresponds to the use of the chemical engineering methods in tannery research. The possibilities of binding the sodium chloride to hide substance, the mechanics of sodium chloride transfer in the hide under the conditions of swelling taking place during the process, and the washing out of soluble proetins have been considered. The mathematical model is proposed on the basis of the following presumptions : the sodium chloride sorption of the hide substance is small and may be simply neglected, the mass transfer in the hide under laboratory conditions occurs by a diffusion mechanism. The diffusion occurs along the actual pore length and the same is very little altered by swelling. A lower velocity of sodium chloride removal is observed in the case of a hide with high degree of dry matter, because of the closed structure due to agglutination resulting from over-drying, and also in the case of a hide with increased quantities of fat on the flesh side. En ligne : https://drive.google.com/file/d/1__jE21A9ZJHWWBLCoI8WlZOIKl8HU-aH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8843 [article]

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Mathematical model of the soaking process, part II / A. Blaha 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. 172-174 Titre : Mathematical model of the soaking process, part II Type de document : texte imprimé Auteurs : A. Blaha, Auteur ; Karel Kolomaznik, Auteur ; T. Dederle, Auteur Année de publication : 1989 Article en page(s) : p. 172-174 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The validity and application of the mathematical model of the soaking process under actual production conditions has been investigated. Four full scale soaking tests were run in mixers with an effective capacity of 12m3. The measured values obtained have confirmed the validity of the diffusion mathematical model and the possibility of its application to process optimisation. The kinetics of the process depend significantly upon the dyness of the raw hide - the process is conclusively slower for hides with high dry substance value. En ligne : https://drive.google.com/file/d/1__jE21A9ZJHWWBLCoI8WlZOIKl8HU-aH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8857 [article]

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Non-ammonia deliming of cattle hides with magnesium lactate / Karel Kolomaznik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXXI, N° 1 (01/1996)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXXI, N° 1 (01/1996) . - p. 18 - 20 Titre : Non-ammonia deliming of cattle hides with magnesium lactate Type de document : texte imprimé Auteurs : Karel Kolomaznik, Auteur ; A. Blaha, Auteur ; David G. Bailey, Auteur ; Maryann M. Taylor, Auteur ; T. Dedrle, Auteur Année de publication : 1996 Article en page(s) : p. 18 - 20 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Due to effluent limitations there is a great deal of interest in the tanning industry to find a replacement for ammonium salts currently used in the deliming process. Considerable attention has been paid to magnesium salts, in particular to magnesium sulfate or magnesium chloride, either as the salt alone or in combination with various acids. Leather resulting from deliming with these magnesium salts is comparable and in some ways superior to leathers delimed with ammonium sulfate. This paper proposes the use of magnesium lactate for non-ammonia deliming of white hides. Magnesium lactate combines the advantages of deliming with lactic acid (increased solubility over the calcium salt of the acid) and the advantages of magnesium salts (improved grain quality of the finished leather). The detailed procedures and the results of tannery scale evaluations using magnesium lactate are presented. An inexpensive source of this chimical is described, prepared from a dairy industry waste effluent. En ligne : https://drive.google.com/file/d/1SS0Imvrwbb8tA6GQFNZ1CZWPVFe3FSVP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7860 [article]

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