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Auteur Alberto Sofia |
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Hydrolysis of chrome shavings : application of collagen hydrolysate and "crylic-protein" in post tanning operations / Carlos S. Cantera in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 5 (09-10/1997)
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Titre : Hydrolysis of chrome shavings : application of collagen hydrolysate and "crylic-protein" in post tanning operations Type de document : texte imprimé Auteurs : Carlos S. Cantera, Auteur ; M. de Giuste, Auteur ; Alberto Sofia, Auteur Année de publication : 1997 Article en page(s) : p. 183-191 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The tanning industry is a generator of liquid wastes as well as tanned and non-tanned solid wastes plus those derived from the waste water treatment plant. This situation requires the introduction of "cleaner leather technologies" and of treatment systems for both effluents and solids wastes, so that pollutant discharge standards can be reached.
Particularly, solid wastes from chrome tanned leather require special attention because of their volume and of the requirements by authorities for their direct disposal in landfill sites. A technological alternative for upgrading these xastes is the detanning of chrome shavings (and wet-blue trimmings) through alkaline hydrolysis assisted by the action of proteolytic enzymes at a moderate temperature (55°C), so as to obtain a collagen hydrolysate and a "chrome cake", both with potential applications in the tanning industry.
This paper describes experiments performed inthe application of collagen hydrolysates and of "acrylic-protein" polymers (acrylic acid/ Hydrolysed collagen polymers) in post-tanning processes for the manufacture of bovine leather for "softy" uppers. The retanning capacity of synthesized polymers and the positive effects attained from hydrolysates in the fatliquoring process ("nutrient and cosmetic effects") were assessed by means of a subjective evaluation and through a statistical analysis of the physico-mechanical strengths of the leathers.
Results are also shown from a laboratory test with chrome tanned hide powder aimed at assessing the "retanning degree" of these products. The test was developed to allow the comparison of the retanning agents under analysis and to complement the retanning test.En ligne : https://drive.google.com/file/d/15bK0n34z8cwVpX9jMpvXdLo-dZthWjqc/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8008
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 5 (09-10/1997) . - p. 183-191[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007018 - Périodique Bibliothèque principale Documentaires Disponible Rapid sole leather tannage using quebracho extract / Alberto R. Angelinetti in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 4 (07-08/1979)
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Titre : Rapid sole leather tannage using quebracho extract Type de document : texte imprimé Auteurs : Alberto R. Angelinetti, Auteur ; Carlos S. Cantera, Auteur ; Alberto Sofia, Auteur ; Juan Martinez, Auteur Année de publication : 1979 Article en page(s) : p. 77-78 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux
PicklageLe picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu.
QuebrachoLe quebracho est un arbre à écorce ligneuse, mesurant 30 mètres de haut, à feuilles tannées et à fleurs tubulées blanches.
Quebracho est l'un des noms communs, en espagnol, d'au moins trois espèces similaires d'arbres originaires du Gran Chaco, en Amérique latine : Schinopsis lorentzii (quebracho colorado santiagueño), de la famille des Anacardiaceae ; Schinopsis balansae (quebracho colorado chaqueño), de la même famille ;
Aspidosperma quebracho-blanco (quebracho blanc), de la famille des Apocynaceae.
Ces trois espèces sont riches en tanin et fournissent un bois très dur, particulièrement résistant. Leur nom provient de l'espagnol quiebrahacha, qui signifie brise-hache.
Semelles
Sulfate de sodium anhydre
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Dry tannage in drums using quebracho extract is a very interesting process because it permits one to obtain a sole of good quality in a short time. Nevertheless certain difficulties that do not exist in tannages using pits and drums arise, therefore a preliminary treatment of the pelt is very important to obtain the best results. En ligne : https://drive.google.com/file/d/1vmrj1o2-GqnN40VFnJGabdLPPeoecCqi/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40499
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 63, N° 4 (07-08/1979) . - p. 77-78[article]Relationship of leather break to grain and flesh layers stress - Strain properties / Jorge A. Vergara in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 2 (03-04/1979)
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Titre : Relationship of leather break to grain and flesh layers stress - Strain properties Type de document : texte imprimé Auteurs : Jorge A. Vergara, Auteur ; Alberto Sofia, Auteur ; José Hidalgo van Dick, Auteur ; Victor D. Vera, Auteur Année de publication : 1979 Article en page(s) : p. 25-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Emulsions
Homopolymères
Matériaux -- Imprégnation
Polyacrylate d'éthyle
Polyacrylate de butyle
Polyacrylate de méthyle
Polymérisation en émulsion
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
Rigidité (physique)
Rupture (mécanique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Four impregnating resins (homopolymers) were produced from methyl acrylate, ethyl acrylate, butyl acrylate and methyl methacrylate monomers respectively. The emulsion polymerisation method and other chemical agents were maintained constant. Upper leathers were impregnated with these resins following a statistical design which included non-impregnated leathers as controls. Leather break and stiffness were assessed before and after the impregnating process. The elasticity modulus at 2% extension was measured for ail leathers and also in their respective grain and flesh layers after splitting. From the results obtained several concrete facts emerged. First, the leather break and stiffness increased in the following resins order: butyl acrylate < ethyl acrylate= methyl methacrylate < methyl acrylate. Relationships of the grain layer elasticity modulus to the flesh layer one for the impregnated leathers (Mi grain/Mi flesh) and for the control leathers (Mc grain/Mc flesh) were calculated. It was found that an increase in the difference between these two relationships correlated very well with the increase found in the leather break. On the other hand, when the leathers were impregnated with film forming polymers, their elasticity modulus increased proportionally to the polymer hardness increase. Note de contenu : - EXPERIMENTAL : Impregnating emulsions - Leather ande application of the impregnating resin
- RESULTS : Leather break - Stiffness - Elasticity modulus
- Table 1 : Emulsion composition
- Table 2 : Break (0 = poor ; 10 = escellent) control leather score = 5.0
- Table 3 : Stiffness (0 = soft ; 5 = extremely rigid) (control leather score = 2.0
- Table 4 : Impregnated leather elasticity modulus measured at 2% of strain (g/mm2) (control leather elasticity modulus = 1.444 g/mm2)
- Table 5 : Relative variation of elasticity modulus (ΔMR) of grain and corium layers of impregnated leather referred to the control and break increase obtained with each resin emulsionEn ligne : https://drive.google.com/file/d/1NNJQVVSKaupq3f55T1L04_U_ORQefQ0e/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34137
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 63, N° 2 (03-04/1979) . - p. 25-27[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007120 - Périodique Bibliothèque principale Documentaires Disponible