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The treatment of collagen fibre and cattle hide with transglutaminase in supercritical carbon dioxide / Cheng Haiming in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 5 (09-10/2014)
[article]
Titre : The treatment of collagen fibre and cattle hide with transglutaminase in supercritical carbon dioxide Type de document : texte imprimé Auteurs : Cheng Haiming, Auteur ; Wu Lian, Auteur ; Yin Zhonglong, Auteur ; Chen Min, Auteur ; Li Zhiqiang, Auteur Année de publication : 2014 Article en page(s) : p. 216-221 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène
Cuirs et peaux de bovins
Fluides supercritiques
Réticulants
Température de retrait
TransglutaminaseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : It was reported that supercritical fluids could increase the reaction rates and stability of enzymes. The transglutaminase (TGase) was used as a cross-linking agent for collagen fibre and cattle hide in supercritical carbon dioxide (SCF-CO2) medium. The denaturation temperature (Td) and shrinkage temperature (Ts) of the cross-linked samples were determinated. SCF-CO2 could improve the cross-linking reaction of the TGase with the collagen fibre and cattle hide according to the denaturation temperature determination. For collagen fibre, the Td of TG-SCF-Collagen is about 20°C higher than that of TG-Collagen in water medium. While the Td of cattle hide treated with TGase in SCF-CO2 is about 10°C higher than that of in water medium. Interestingly, the shrinkage temperature of the cattle hide did not show any change while it was treated by TGase both in SCF-CO2 medium and in water. However, the appearence of the hide after TGase treatment was tighter and finer with the area reduction. The results implied that intermolecular cross-linking created by TGase did not like the cross-linking by chrome (III)tanning agents, which formed rigid structures among the collagen fibrils that play the main role for the increase of shrinkage temperature of leather. Note de contenu : - MATERIALS AND METHODS : Materials - Collagen fibre treated with TGase in SCF-CO2 - Cattle hide treated by TGase in SCF-CO2 - Differential Scanning Calorimetry (DSC) - Determination of the shrinkage temperature - Appearance - Physical properties determination
- RESULTS AND DISCUSSION : Collagen fibre treated by TGase in SCF-CO2 - Cattle hide treated with TGase in SCF-CO2En ligne : https://drive.google.com/file/d/1_LvTHftpV-xR6GWNHBdkPlVwSLotld8u/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22273
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Code-barres Cote Support Localisation Section Disponibilité 16629 - Périodique Bibliothèque principale Documentaires Disponible 16621 - Périodique Bibliothèque principale Documentaires Disponible The use of profilometry to characterise the leather surface / Prosper Mhute in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 1 (01-02/2017)
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Titre : The use of profilometry to characterise the leather surface Type de document : texte imprimé Auteurs : Prosper Mhute, Auteur ; Karl Flowers, Auteur ; Alex J. Goddard, Auteur ; William R. Wise, Auteur Année de publication : 2017 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Cuirs et peaux -- Analyse
Cuirs et peaux de bovins
Cuirs et peaux de chèvres
ProfilométrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The quality of finished leather is often deterrnined based on the grain characteristics or pattern. The grain characteristics of leathers vary according to the age of the animal, breed, gender, climate, animal husbandry practices and processing conditions. However, the assessment of the leather surface or grain characteristics is often subjective. In this study, the grain characteristics were determined using a profilometry technique. Profilometry, a metrological method, is essentially the measurement or assessment of surface texture which is interrelated with its friction and wear properties.
The aim of the study was to define and grade the leather surface based on a given scale as well as to analyse the affect of various leather-making operations, including tanning, on the grain texture of leather from species of different origine.
Hides (bovine) and skins (caprine) were subjected to various processing conditions, including deliberately extreme conditions, such as extended timing processes and a shrunken grain tannage. The topography of the grain surface was analysed using an optical profilometer ; with the 3-dimensional stitched scans produced verified by scanning electron microscopy.
The results demonstrate a technique that could be used in forensic, quality control and research contexte to provide tanners with an indication of the impact of the processing on the grain pattern of their leather.En ligne : https://drive.google.com/file/d/1XZqwwWJkGzgsf1wbY-Jmr8XJYJG284qc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27997
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Code-barres Cote Support Localisation Section Disponibilité 18711 - Périodique Bibliothèque principale Documentaires Disponible Thermal characterization and pyrolysis of waste leather treated with CoCl2 and MnCl2 / E. Bañón in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 2 (02/2021)
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Titre : Thermal characterization and pyrolysis of waste leather treated with CoCl2 and MnCl2 Type de document : texte imprimé Auteurs : E. Bañón, Auteur ; A. Torro, Auteur ; A. N. GarcÃa, Auteur ; M. León, Auteur ; A. Marcilla, Auteur Année de publication : 2021 Article en page(s) : p. 46-57 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse multivariée
Caractérisation
Catalyse
Chlorure de manganèse (II)
Chromatographie en phase gazeuse
CoCl2
Cuir -- Déchets
Cuirs et peaux de bovins
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Spectrométrie de masse
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather tanned with different agents was pyrolyzed in the presence of CoC12 and MnC12 catalysts. A bovine leather sample tanned with two inorganic tanning agents (chromium and titanium salts) and two organic tanning agents (glutaraldehyde and methylacrylic resin) has been used in this study. The samples were soaked in solutions of CoC12 or MnC12 of known concentration. The influence on decomposition temperature and the resultant pyrolysis compounds has been evaluated by using thermogravimetric analysis (TG/DTG) and flash pyrolysis (Py-GC/MS). A multivariate analysis has been applied to the pyrolysis products obtained confirming the effect of the catalyst treatment on leather, specifically on samples tanned with organic agents. According to the results, CoC12 (higher Lewis acidity) shows a greater influence than the MnC12 (lower Lewis acidity). The results indicate that the presence of chlorides affects the nature of the pyrolysis products, increasing the yield of the aromatic compounds in ail the samples, thus improving the added-value of the volatiles. These catalysts reduced slightly the decomposition temperature. Note de contenu : - MATERIALS AND EXPERIMENTAL EQUIPMENT : Materials - Thermobalance - Pyroprobe connected online with a gas chromatograph (Py-GC/MS)
- EXPERIMENTAL PROCEDURE : Thermobalance - Pyroprobe connected online with a gas chromatograph (Py-GC/MS) - Chloride treatment process - Multivariate analysis
- RESULTS AND DISCUSSION : Thermogravimetric study - Flash pyrolysis in a Py-GC/MS system
- Fig. 1 : TG curves of treated and untreated samples
- Fig. 2 : DTG curves of treated and untreated samples
- Fig. 3 : GC-MS chromatograms of tanned samples and GC-MS chromatograms of tanned sample
- Fig. 4 : Dendrogram obtained from the analysis of the hierarchical clusters
- Table 1 : Temperatures for maximum decomposition rate of leather tanned with different tanning agents before and after chloride soaking treatment
- Table 2 : Area percentage of identified compounds
- Table 3 : Classification and area percentage of identified compounds
- Table 4 : Principal component analysis (PCA). Total variance explainedDOI : https://doi.org/10.34314/jalca.v116i2.4235 En ligne : https://drive.google.com/file/d/1XzEcWBzqqQGPJylMwdVk5-hn4qCSpgvk/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35308
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Code-barres Cote Support Localisation Section Disponibilité 22600 - Périodique Bibliothèque principale Documentaires Disponible Thermophysical and functional-consumer qualities of shoe upper leather / Nataliia Pervaia in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 1 (01-02/2020)
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Titre : Thermophysical and functional-consumer qualities of shoe upper leather Type de document : texte imprimé Auteurs : Nataliia Pervaia, Auteur ; Olga Andreyeva, Auteur ; Lesia Maistrenko, Auteur ; Larysa Ocheretna, Auteur Année de publication : 2020 Article en page(s) : p. 19-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux -- Propriétés thermiques
Cuirs et peaux de bovins
Maléique, Acide
Perméabilité
Porosité
Résistance à la traction
Résistance thermique
Tige de la chaussure
Vapeur d'eauIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Nowadays, the production of shoes having certain functional-consumer qualities requires materials, which meet all final product requirements, are environmentally safe and do not overcomplicate the production cycle. In this paper the influence of conditions of using a polymeric material based on maleic acid prior to dyeing the bovine shoe upper leather was studied. According to the results of electron microscopic examination, as well as evaluation of the physico-mechanical and thermophysical properties of the leather it was revealed that the use of polymeric material contributes to the formation of structure and such important indices of the derma as tensile strength, grain strength, extension, water vapour permeability, apparent density, porosity, heat resistance and thermal absorptivity. On the basis of a generalised objective function, optimal processing variants were defined. Recommendations of leather production parameters taking into account the season of shoe exploitation (autumn/winter, spring/summer) have been made. Note de contenu : - EXPERIMENTAL SECTION : Materials - Leather semi-ifinished product processing techniques - Research methods and equipment
- RESULTS AND DISCUSSION : Crusting processes planning matrix
- Table 1 : Variation intervals and levels of factors
- Table 2 : Crusting processes planning matrixEn ligne : https://drive.google.com/file/d/1Va3RwRsD7eUSc4oOwpONqicTwMW2rSNw/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33539
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Code-barres Cote Support Localisation Section Disponibilité 21508 - Périodique Bibliothèque principale Documentaires Disponible Two-stage temperature change chrome tanning : A more sustainable tanning process / Hui Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 5 (05/2019)
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Titre : Two-stage temperature change chrome tanning : A more sustainable tanning process Type de document : texte imprimé Auteurs : Hui Zeng, Auteur ; Weixing Xu, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : p. 153-162 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Caractérisation
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de bovins
Surfaces -- Analyse
Tannage au chrome
Température
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Under the guidance of molecular simulation of Cr(III) species in water solution, a novel chrome tanning process, the two-stage temperature change chrome tanning, was developed. In stage I, the pickled cattle hide was first tanned by a small amount of chrome tanning agent under room temperature to obtain basic hydrothermal stability. Then, in stage II, the pre-tanned wet-blue was tanned again under a high temperature (≥ 60°C) to enhance the reactivity of Cr(III) with collagen fibers. The shrinkage temperature of crusts, the absorptivity of chrome tanning agent and fatliquoring agent, the mechanical property and surface morphology of crusts were characterized to evaluate the tanning effect. The results showed that when the dosage of chrome tanning agent in two stages was 2 wt% (tanned under room temperature) and 1 wt% (tanned under 60°C), respectively, the best performances of crust were achieved. In these conditions, the shrinkage temperature of crust was 104.6°C. The comprehensive absorptivity of chrome tanning agent reached up to 96.3%. The absorptivity of fatliquoring agent in wet-blue was 90.2%. The mechanical property and grain fineness of the crust were comparable to those of conventional chrome tanned crust with 6 wt% chrome tanning agent. As a result, an efficient and more sustainable chrome tanning process with less offer of chrome tanning agent was achieved. Note de contenu : - EXPERIMENTAL : Materials and equipment - preparation of chrome tanned samples (wet-blue/crusts) - The main Cr(III) species under different temperature - Measurements and instruments
- RESULTS AND DISCUSSION : The states of Cr2(SO4)3 in water solution at penetration stage and combination stage of chrome tanning - Effect of tanning conditions on properties of wet-blue/crusts - Effect of tanning conditions on Ts of crusts - Effect of tanning conditions on comprehensive absorptivity of chrome tanning agent
- Effect of tanning conditions on Cr2O3 content of wet-blue - Effect of tanning conditions on mechanical property of crusts - Effect of tanning conditions on grain morphology of crusts - Effect of tanning conditions on the chrome distribution in experimental wet-blue - Further optimization of the temperature change chrome tanning technology - Effect of chrome tanning agent dosage in stage II on tanning effect of experimental wet-blue/crusts - Effect of the chrome tanning agent dosage in stage II on the properties of experimental crustsEn ligne : https://drive.google.com/file/d/1wQIwx4fNXcMH-sJ-KpQZiW-bbAkzYMCd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32475
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Code-barres Cote Support Localisation Section Disponibilité 20910 - Périodique Bibliothèque principale Documentaires Disponible Ultrastructural observations of skin samples obtained from various parts of animal and human body / P. L. Muthiah in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
PermalinkUltrastructural observations of skin samples obtained from various parts of animal and human body / P. L. Muthiah in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61, N° 1 (01-02/1977)
PermalinkUnhairing of bovine skin with fungal enzymes by immersion and spread throughout the epidermis / Maria Laura Garro in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 1 (01-02/2019)
PermalinkUtilisation of phenolsulphonic acid to hydrolyse chrome shavings in preparation of composite condensates for leather retanning / Junqing Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 4 (07-08/2018)
PermalinkVieillissement du collagène pendant la conservation et le stockage des peaux / Wiktor Pietrzykowski in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXVI (Année 1974)
PermalinkWithin and between skin variation of physical properties in bovine leather / A. W. Landmann in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 3 (05-06/1979)
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