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Approach towards safe and efficient enzymatic unhairing of bovine hides / Mei Chen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 2 (02/2018)
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Titre : Approach towards safe and efficient enzymatic unhairing of bovine hides Type de document : texte imprimé Auteurs : Mei Chen, Auteur ; Mingfang Jiang, Auteur ; Min Chen ; H. Cheng Année de publication : 2018 Article en page(s) : p. 59-64 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caséine Les caséines sont des protéines qui constituent la majeure partie des composants azotés du lait. La première phase de la fabrication du fromage est leur précipitation par adjonction d'un acide ou de présure. Le mot caséine est issu du latin caseus, "fromage".
- Caractéristiques : La quantité des caséines d'un lait varie selon les espèces animales : 82 % (des protéines) pour le lait de vache et 40 % pour le lait humain.
L'hydrolyse d’une caséine fait ressortir des teneurs élevées en acide glutamique, proline, leucine, lysine, sérine et thréonine.
- Caséines bovines : Il y a plusieurs types de caséines dans le lait de vache. Les plus présentes sont les caséines αS1 (40 %), β (35 %), κ (12 %), αS2 (10 %) et γ (3 à 7 %).
La caséine du lait de vache précipite facilement en caillots blancs, soit par abaissement du pH au voisinage de son point isoélectrique (pH 4,6), soit par action enzymatique (présure). La caséine du lait humain ne précipite pas par simple acidification. Cependant, la précipitation à un pH de 6 est immédiate en présence du suc gastrique du nourrisson à cause de la présure qu'il contient (la chymosine pour être précis).
- Caséines humaines : Les caséines représentent 40 % des protéines du lait humain contre 82 % dans le lait de vache. Elles forment également des micelles plus petites qui expliquent en plus de la haute teneur en protéine solubles la coagulation plus fine du lait maternel dans l’estomac du nourrisson. (Wikipedia)
Cuirs et peaux de bovins
Epilage enzymatique
Hydrolyse enzymatique
Ions métalliquesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Unhairing is an essential step in leather manufacturing. The traditional hair-burning technology brings huge sulfide pollution and large COD, BOD in the effluent. Hair-saving enzymatic unhairing is a popular method for displacing sulfide unhairing. However, some of the problems associated with enzymatic unhairing are need for greater control over process parameters and possibility of grain damage to the pelt. To overcome these challenges, an attempt has been made to utilize bivalent metal ions for safe and efficient enzymatic unhairing on bovine hides. The effect of metal ions such as Ca(II), Mg(II), Mn(II), and Zn(II) ions on the activity of AS1.398 protease for hydrolyzing collagen and casein was investigated. The findings were corroborated with the bovine hide unhairing and the resultant leathers were of appreciable quality. The outcomes of this study could add to the knowledge of enzymatic unhairing leading to cleaner leather manufacturing in a safe and efficient way. Note de contenu : - MATERIALS AND METHODS : Enzymatic activity assays - Effect of metal ions to collagen hydrolytic activity - The procedure of enzymatic unhairing with metal ions - Determination of the total protein content - Determination of the hydroxyproline content - Physical properties testing
- RESULTS AND DISCUSSION : Effect of metal ions to AS1.398 hydrolyzing of collagen fibers - Effect of metal ions to AS1.398 hydrolyzing of casein - Application on enzymatic unhairing processEn ligne : https://drive.google.com/file/d/1Q0ApdHCgWu1jtinc_Um-xzBwSplvAn9-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29953
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Code-barres Cote Support Localisation Section Disponibilité 19539 - Périodique Bibliothèque principale Documentaires Disponible Approach towards zero discharge tanning : exploration of NaOH based opening up method / Palanisamy Thanikaivelan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 6 (06/2001)
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Titre : Approach towards zero discharge tanning : exploration of NaOH based opening up method Type de document : texte imprimé Auteurs : Palanisamy Thanikaivelan, Auteur ; T. Ramasami, Auteur ; Balachandran Unni Nair, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2001 Article en page(s) : p. 222-233 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Beam house processes are known to contribute 60-70% of the total pollution load in leather processing. The chemicals, namely sodium sulphide and lime, were not quantified and employed without proper rationale. Lime has a potential to drive swelling in a gradual manner due to its low solubility but lacks in environmental concern. Huge amounts of lime sludge and total solids formation are the main drawbacks of lime. In an earlier attempt, lime has been totally avoided for dehairing purpose. However, lime has been indispensable for the purpose of opening up of fibre bundles. Sodium hydroxide for this purpose was thought to be an improper choice due to its high alkaline nature. In this investigation an optimum concentration (1.0% offer at 350% float) of sodium hydroxide has been established for optimal opening up of fibre bundles. This has been substantiated through scanning electron microscopic, spent alkali liquor and pelt analysis, softness measurements and stratigraphic chrome distribution analysis. Performance of the leathers is shown to be on par with conventionally treated leathers through physical and hand evaluation. Especially softness of the leathers is numerically proven to be comparable with that of control. The process also enjoys elimination of deliming process coupled with a 45% reduction in total solids load on environment. En ligne : https://drive.google.com/file/d/1FMDazk_Ue4XcI_64aCdPZPIZDhE5qDlW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4374
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Code-barres Cote Support Localisation Section Disponibilité 001564 - Périodique Bibliothèque principale Documentaires Disponible AQEIC BOLETIN TECNICO / Asociación QuÃmica Española de la Industria del Cuero / Barcelona [Espagne] : Asociación QuÃmica Española de la Industria del Cuero
[périodique] Voir les bulletins disponibles
Titre : AQEIC BOLETIN TECNICO Type de document : texte imprimé Auteurs : Asociación QuÃmica Española de la Industria del Cuero, Auteur Editeur : Barcelona [Espagne] : Asociación QuÃmica Española de la Industria del Cuero ISBN/ISSN/EAN : 0365-5873 Note générale : Année de publication 1960 =>
Suite de : Boletín de la Asociación Química Española de la Industria del Cuero (ISSN 0211-6731)
Périodicité : Mensuel
Etat de la collection : 1960 => 1982 (manque les années 1961 et 1971)Langues : Espagnol (spa) Catégories : Cuirs et peaux -- Périodiques Index. décimale : 675 Technologie du cuir et de la fourrure Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2241 [périodique] Voir les bulletins disponiblesAqueous finishing of leather / Wolfang Wenzel in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVI, N° 11 (11/1991)
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Titre : Aqueous finishing of leather : Products, processes and problems Type de document : texte imprimé Auteurs : Wolfang Wenzel, Auteur Année de publication : 1991 Article en page(s) : p. 442-455 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : These days, ecology is a matter of top priority in many countries.Even in areas where less importance is placed on the environment,it is only a matter of time before the problems of effluent, exhaust air and waste disposal will have to be solved before permission is given for the operation of production facilities.Some industrialized countries already have extremely stringent statutory regulations on pollution of ground water and air.The leather industry,which is dependent on the use of a wide variety of chemicals,is particularly hard hit by such regulations,in both the wet processing and finishing sectors.This paper looks at finishing systems that have little or no impact on the air.
The main ecological problem connected with leather finishes is the use of organic solvents,especially in "effect" finishes and topcoats,where they are needed to dissolve the polymers used.Once the solvents have fulfilled their function in the application of the finish,they have to be removed from the finish layer and the leather.Whether this occurs in the spraying booth,the drying tunnel or by evaporation in air, all the solvents used are released into the air over a given time.
Instead of cleaning the waste air the most promising alternative is the use of aqueous systems.
How far advanced are aqueous systems and what are the main problems that still have to be solved?
En ligne : https://drive.google.com/file/d/1GPQrku-DjyKV0vAqpIcUToixwCpeW-8R/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8421
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Code-barres Cote Support Localisation Section Disponibilité 006886 - Périodique Bibliothèque principale Documentaires Disponible Aqueous finishing with polyisocyanate cross-linked binders / Lluis Ollé in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)
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Titre : Aqueous finishing with polyisocyanate cross-linked binders Type de document : texte imprimé Auteurs : Lluis Ollé, Auteur ; M. Cobos, Auteur ; O. Solé, Auteur ; Anna Bacardit, Auteur Année de publication : 2009 Article en page(s) : p. 222-228 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition
Liants
Polyacryliques
Polyisocyanates
Polyuréthanes
Réactions chimiques
Réticulants
Réticulation (polymérisation)
Solutions aqueuses (chimie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Due to increasingly stringent environmental legislation the leather industry has to produce eco-friendly articles. At the same time, it needs to manufacture fashionable and high-quality articles in order to increase competitiveness. As part of this, factories have to replace solvent-based products by water-based products in their finishing formulations to reduce the level of volatile organic compounds. The addition of a cross-linker is required in most cases in order to obtain high performance aqueous finishes. The aim of the present work is to explore the cross-linking reaction between polyisocyanate and both acrylic binders and polyurethanes.
A comparision of results shows that polyisocyanate presents a very fast reticulation (cross-linking) speed at room temperature and has a pot-life of only 4 hours. In order to obtain optimum fastness values, different amounts of polyisocyanate are required, the amounts depend on the type of leather used and the physical characteristics of the binders employed.Note de contenu : - FIGURES : 1. Reaction initiation of the isocyanate group - 2. Reaction between isocyanate and functional groups - 3. Diisocyanates most commonly used in industry - 4. Evolution of the cross-linking reaction of acrylic binders A over time. Chrome leather with chrome retanning. 25 wet rubs - 5. Comparaison between cross-linked acrylic binders on chrome leather with chrome retanning. 25 wet rubs, 7 days'storage - 6. Comparaison between cross-linked acrylic binders on vegetable leather. 25 wet rubs, 7 days'storage - 7.Comparaison between cross-linked acrylic binders on chrome leather with res-syn-veg retanning. 25 wet rubs, 7 days'storage - 8. Comparaison between cross-linked polyurethane binders on chrome leather with chrome. 25 wet rubs, 7 days'storage - 9. Comparaison between cross-linked polyurethane binders on vegetable leather. 25 wet rubs, 7 days'storage - 10.Comparaison between cross-linked polyurethane binders on chrome leather with res-syn-veg retanning. 25 wet rubs, 7 days'storage
- TABLES : 1. Coating formulations - 2. Physical characteristics of acrylic binders - 3. Physical characteristics of polyurethane binders - 4. Results of colour fastness to dry rubbing. Acrylic binders - 5. Results of colour fastness to wet rubbing. Acrylic binders - 6. Results of colour fastness to dry rubbing. Polyurethane binders - 7. Results of colour fastness to wet rubbing. Polyurethane binders - 8. Results of dry flex resistance - number of rubs x 1000 - 9. Results of wet flex resistance - number of rubs x 1000 - 10. Determination of binder acidityEn ligne : https://drive.google.com/file/d/17et4UOXjaozggPe2HNaiDqR7M_LV0Miu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25650
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Code-barres Cote Support Localisation Section Disponibilité 011791 - Périodique Bibliothèque principale Documentaires Disponible Are indexes characterizing the efficiency of biological treatment of wastewater reliable criterIa for the assessment of the impact of chromium compounds on activated sludge ? / Barbara Felicjaniak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 4 (07-08/2009)
PermalinkArea measurement of leather and its use in commerce / Axel Landmann in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 1 (01-02/2012)
PermalinkArea retention studies for vacuum-dried leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 10 (10/2002)
PermalinkArea weight yields in dressing EI crust stock in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 4 (04/1970)
PermalinkArt et techniques du cuir / Jean-Louis Peyre / Dourdan : Editions Vial (2019)
PermalinkAssessment of carbon contribution to the East Kolkata Welland Ecosystem (Ramsar Site: 1208) by leather producing units of the Calcutta Leather Complex : Part I / Sudin Pal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)
PermalinkAssessment of carbon contribution to the East Kolkata Wetland ecosystem (Ramsar Site : 1208) by leather producing units of the Calcutta leather complex : Part II / Sudin Pal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 2 (03-04/2015)
PermalinkAssessment of properties and effect of heterogeneous cultures of aerobic micro-organisms in the bio technology of tannery wastewater / J. Kupec in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 4 (07-08/2001)
PermalinkAssessment of the thermal resistance of leather / Anna Matz in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 68 (Année 1984)
PermalinkAssociated use of enzymes and hydrogen peroxide for cowhide hair removal / Eliane Andrioli in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 2 (02/2014)
PermalinkAtmospheric pollutants and the deterioration of leather / H. V. Piltingsrud in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 2 (03-04/2022)
PermalinkAttenuated total reflectance spectroscopy as a tool for determining water resistance / A. Z. Trifonov in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 74 (Année 1990)
PermalinkAuthentic Material, la start-up qui valorise les chutes de cuir / Juliette Sebille in LEATHER FASHION DESIGN (LFD), N° 1 (02/2019)
PermalinkAuto interior material types / Abigail Clare in INTERNATIONAL LEATHER MAKER (ILM), N° 53 (05-06/2022)
PermalinkAutomated clean leather dyeing assisted by wringing, ultrasound and microwave / Ying Gong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 4 (04/2011)
PermalinkAutomated grading with Al and traceability / Neil Martin in INTERNATIONAL LEATHER MAKER (ILM), N° 49 (09-10/2021)
PermalinkPermalinkAutomated hide identification / Tom Hogarth in INTERNATIONAL LEATHER MAKER (ILM), N° 57 (01-02/2023)
PermalinkAutomated optical inspection / Johannes Hoehne in INTERNATIONAL LEATHER MAKER (ILM), N° 63 (01-02/2024)
PermalinkAutomatic determination of shrinkage temperature from shrinkage data of leather / E. Mäntysalo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 2 (02/1994)
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