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Mathematical model of raw hide curing with brine / Eduard Hernàndez Balada in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 5 (05/2008)

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 5 (05/2008) . - p. 167 - 173 Titre : Mathematical model of raw hide curing with brine Type de document : texte imprimé Auteurs : Eduard Hernàndez Balada, Auteur ; Robert L. Dudley, Auteur ; Peter H. Cooke, Auteur ; Karel Kolomaznik, Auteur ; William N. Marmer, Auteur Année de publication : 2008 Article en page(s) : p. 167 - 173 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The most common method of preserving raw hides is brine curing with sodium chloride. However, this process has three important disadvantages : first, the length of time that it takes, which is a minimum of 18 hours ; second, the insufficient degree of curing reached in some hides due to an overload and possibly the low efficiency of the brine raceway ; and finally, the environmental impact associated with the discharge of large quantities of electrolytes in the soaking step. Our long term goal is to address all three issues. Initially, we have carried out a study of the salt uptake and its diffusion mechanism in order to attempt a reduction in the curing time. A continuous reaction mathematical model of a closed one dimensional system that describes the diffusion of sodium chloride in the hide during the curing process was chosen in the search for the optimum brine curing conditions such as the optimum brine concentration and percent float. The effect of these two parameters on the values of transport coefficient lambda was reported. Brine diffusion into the hide was tracked by measurement of the chloride concentration of the residual brine solution. In addition, a piece of hide was cured with a fluorescently labeled brine solution and analyzed by means of epifluorescent microscopy for direct visualization of the sodium location within the hide. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2563 [article]

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Factors that influence the physical properties of goatskins : polymeric derivatives and optimization of the process / Ramón Palop in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 5 (05/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 5 (05/2008) . - p. 167 - 173 Titre : Factors that influence the physical properties of goatskins : polymeric derivatives and optimization of the process Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Agusti Marsal, Auteur ; Albert M. Manich, Auteur Année de publication : 2008 Article en page(s) : p. 167 - 173 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The most common method of preserving raw hides is brine curing with sodium chloride. However, this process has three important disadvantages : first, the length of time that it takes, which is a minimum of 18 hours ; second, the insufficient degree of curing reached in some hides due to an overload and possibly the low efficiency of the brine raceway ; and finally, the environmental impact associated with the discharge of large quantities of electrolytes in the soaking step. Our long term goal is to address all three issues. Initially, we have carried out a study of the salt uptake and its diffusion mechanism in order to attempt a reduction in the curing time. A continuous reaction mathematical model of a closed one dimensional system that describes the diffusion of sodium chloride in the hide during the curing process was chosen in the search for the optimum brine curing conditions such as the optimum brine concentration and percent float. The effect of these two parameters on the values of transport coefficient lambda was reported. Brine diffusion into the hide was tracked by measurement of the chloride concentration of the residual brine solution. In addition, a piece of hide was cured with a fluorescently labeled brine solution and analyzed by means of epifluorescent microscopy for direct visualization of the sodium location within the hide. En ligne : https://drive.google.com/file/d/1cFBFfjGvXtRi6bn53Nu2lV_WLzL18MzJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2564 [article]

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Glove leather manufacture from sheepskins : influence of fatliquors and syntans on the gloving properties / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 5 (05/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 5 (05/2008) . - p. 182 - 190 Titre : Glove leather manufacture from sheepskins : influence of fatliquors and syntans on the gloving properties Type de document : texte imprimé Auteurs : Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; S. Sadulla, Auteur ; Swarna Vinodh Kanth, Auteur ; Rathinam Aravindhan, Auteur ; G. Balaji, Auteur Année de publication : 2008 Article en page(s) : p. 182 - 190 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The post tanning auxiliaries like syntans and fatliquors are known to significantly influence the properties of glove leathers. The right choice of fatliquors and syntans is critical to obtain the leathers with good gloving property. Hence, in the present work an attempt has been made to study systematically the influence of various fatliquors and syntans on the gloving properties of leather made from sheep skins. Combinations of six different types of fatliquors and four syntans have been studied for their influence on the gloving properties viz., run, softness, strength properties and other subjective properties like smoothness and stretch. It is observed that the combination of fatliquors based on sulfited fish oil, sulfochlorinated paraffin wax and lecithin along with glutaraldehyde and polymeric retanning agents result in leathers with better gloving characteristics. En ligne : https://drive.google.com/file/d/1SbWduKdKigMOHOQZruYLGlD_LvfszrUl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2565 [article]

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Synthesis, application and comparison of aqueous polyurethane / Shuling Chai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 5 (05/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 5 (05/2008) . - p. 191 - 199 Titre : Synthesis, application and comparison of aqueous polyurethane Type de document : texte imprimé Auteurs : Shuling Chai, Auteur ; Lihong Fu, Auteur ; Huimin Tan, Auteur Année de publication : 2008 Article en page(s) : p. 191 - 199 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A series of aromatic and aliphatic cationic aqueous polyurethane dispersions were successfully prepared with polypropylene glycol, polypropylene polyol, toluene diisocyanate(TDI), and isophorone diisocyanate(IPDI) as raw materials. The structure and properties of the synthesized aqueous polyurethane dispersions were characterized with FTIR, UV spectra, TEM, DSC, TGA, electronic tensile machine, and the aliphatic and aromatic cationic aqueous polyurethane were compared. Both the aliphatic and the aromatic cationic aqueous polyurethanes are all two phase structure systems. Their two glass transitions took place in the range of-100°C to +220 °C, respectively corresponding to the glass transitions of soft segments and hard segments. Their thermal decomposition also exhibited two stages, respectively corresponding to thermal decompositions of hard segments and soft segments. The strong Pi-Pi* transition absorption peaks took place when X was in the vicinity of 220nm. With the increasing of isocyanate (NCO) group content, the tensile strengths of the films increased and their elongations at break decreased. The particle morphologies of aromatic and aliphatic dispersions both are spherical. They both could be used as the base sealing of pig leather. They also could be used in the sandwich finishing system for pig garment leathers. Compared to the aromatic cationic aqueous polyurethane, the aliphatic series is lower at the glass transition of hard segments, better at photo-resistance; greater in the elongation at break, and lower in tensile strength. The aliphatic cationic aqueous polyurethane can be used as the finishing system of shallow color pig leather or white pig leather, and its UV spectra did not show a characteristic B absorption peak. En ligne : https://drive.google.com/file/d/1eLd_nFVJTdFoUPfEnEMuTTRqf8jnJ9B6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2566 [article]

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