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Assessment 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)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 1-7 Titre : Assessment of carbon contribution to the East Kolkata Welland Ecosystem (Ramsar Site: 1208) by leather producing units of the Calcutta Leather Complex : Part I Type de document : texte imprimé Auteurs : Sudin Pal, Auteur ; Buddhadeb Chattopadhyay, Auteur ; Subhra Kumar Mukhopadhyay, Auteur Année de publication : 2015 Article en page(s) : p. 1-7 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bilan des émissions de gaz à effets de serre Cuirs et peaux -- Industrie -- Inde Dioxyde de carbone Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the context of addition of carbon to East Kolkata Wetland (EKW) ecosystem, an attempt has been made to provide a comprehensive computation of carbon input by raw hides-skins and different chemicals ; and carbon output by various solid and liquid waste from the leather industry. The calculations are based on the conventional operations of nine tanneries of which three produce bag leather, three gloves and three shoe uppers. The amount of carbon that enters into the leather industry depends upon the selection of raw hides and skins, percentage of chemicals used and purity of chemicals. ln case of bag leather and shoe upper manufacturing units the carbon value changes depending on the tannery specific finishing recipe, spray types and number of coats. Besides this the carbon value also changes with the customeris required finish. Whereas the carbon value of solid and liquid wastes changes depending upon the carbon input, mechanical operations and the binding of chemicals with hides and skins. The analysis of large samples from nine selected tanneries has permitted us to calculate that 396.1 ± 11.67kg carbon are present in one tonne raw cattle hides or skins. The processing of this one tonne cattle raw hides and skins results in 65.54 ± 13.06kg carbon being incorporated with chemicals and, from which 320.75 ± 16.37kg of carbon are discharged in the EKW area through different solid and liquid wastes. The tannery agglomerates at the Calcutta Tannery Complex at Bantala, Kolkata are situated on the boundary of the EKW, a Ramsar site, and so this work is thought to be important to assess the carbon-budget of the EKW ecosystem. Note de contenu : - MATERIALS AND METHODS - RESULTS : Process variations - Bag leather tanneries - Glove leather tanneries - Shoe upper tanneries - DISCUSSION : Soaking - Liming - Pickling and chrome tanning - Mechanical operations and post-tanning - Carbon sources En ligne : https://drive.google.com/file/d/1aVYTSm-19LE3A6Gro5nlskWAaGy2YqXH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23227 [article]

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Synthesis and application of eco-friendly amino resins for retanning of leather under different conditions / Rashid Saleem in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 8-15 Titre : Synthesis and application of eco-friendly amino resins for retanning of leather under different conditions Type de document : texte imprimé Auteurs : Rashid Saleem, Auteur ; Ahmad Adnan, Auteur ; Fahim Ashraf Qureshi, Auteur Année de publication : 2015 Article en page(s) : p. 8-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymère mélamine-formaldéhyde Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de chèvres Ethanedial L'éthanedial ou glyoxal est un composé organique de formule brute C2H2O2 et de formule semi-développé O=CH-CH=O. Ce liquide de couleur jaune est le plus petit dialdéhyde existant. C'est aussi une forme tautomère de l'éthynediol (HO–C≡C–OH) . Retannage Sulfamate de sodium Sulfonation Syntans Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Synthetic tanning agents are indispensable for making any type of leather article. There is a challenge for syntans to be processed without formaldehyde to meet strict regulations in the leather goods and chemicals arena. ln the present study, formaldehyde-free melamine based retanning has been developed using glyoxal as a condensing agent and sodium sulfamate as a sulfonating agent. Sulfonated glyoxylated melamine-based resins were prepared using different mole ratios of melamine, sodium sulfamate and glyoxal. The sodium sulfamate to melamine mole ratio (SS/M) was varied from 0.5 to 3.0 and glyoxal to melamine mole ratio (GIM) was varied from 2 to 6. Fluidity and gelling behaviour of resinous solutions were evaluated with the increasing trend of sulfonation and with increasing mole ratio of glyoxal to melamine. Stabilized resins were applied comparatively as retanning agents on chrome-tanned goatskins against a conventional formaldehyde based melamine resin. Comparative tear strengths, tensile strengths, elongation at break and scanning electron micrographs of glyoxylated melamine and formaldehyde-based melamine-retanned leathers were studied and better performance was found in glyoxylated melamine-tanned leathers. The resin with optimum performance was structurally elucidated by FTIR. Note de contenu : - EXPERIMENTAL PROCEDURE : Chemicals and apparatus - Preparation of sulfonated melamine glyoxylated resin - RESULTS AND DISCUSSION : Schematic route - Rheology resins - Application of resins as tanning agent - Quantitative free formaldehyde analysis in leather - Mechanical characteristics of retanned leather - Organoleptic properties - SEM Examination (JEOL 6490) - Structural elucidation En ligne : https://drive.google.com/file/d/16uBp_X7uveqCR_UT06oA5yfieEZmxp1y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23228 [article]

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Analysis of pore-size and related parameters for leather matrix through capillary flow porosimetry technique / Venkatasubramanian Sivakumar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 16-22 Titre : Analysis of pore-size and related parameters for leather matrix through capillary flow porosimetry technique Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; Akshaya Jena, Auteur ; Krishna Gupta, Auteur ; Asit Baran Mandal, Auteur Année de publication : 2015 Article en page(s) : p. 16-22 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : 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. Porosimétrie d'écoulement capillaire Porosité Taille des pores Tannage au chrome Tannage végétal Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather processing involves diffusion of various chemicals through the pores of skin/leather matrix. Pore-size of the matrix has significant impact on the diffusion rates of the substances involved. The determination of pore-sizes and related parameters is necessary for an understanding of the diffusion phenomena in leather processing and related techniques. There are some limitations in existing pore-size measurement techniques for natural fibrous materials like leather; hence there is a need for development of novel techniques with non-influencing character on structure of materials like leather. In this regard, a capillary flow porosimetry technique for pore-size measurement has been applied to two types of leather viz., full-chrome crust leather (FCC) and vegetable-tanned crust (VTC). By utilizing the capillary flow porosimetry technique, important pore-size parameters such as smallest, largest and mean pore-size plus porosity and average Darcy permeability have been determined. The respective values are 0.04p, 0.93p, 0.13p, 59.1% and 0.027 respectively for FCC leather and 0.04p, 0.67p, 0.11p, 49.9% and 0.021 for VTC leather. The results indicate that FCC leather has greater porosity compared to VTC leather; possibly due to chrome tanning providing less filling effect compared to vegetable tanning. Note de contenu : - LIMITATIONS OF EXISTING POROSIMETRY TECHNIQUES : Capillary flow porosimetry technique (CPF) : principle - CPF TECHNIQUES - APPLICATION OF CPF FOR DETERMINING PORE-SIZE PARAMETERS IN LEATHER MATRIX : Structure of leather - MATERIALS AND METHODS - RESULTS AND DISCUSSION : Flow rate vs. pressure - Cumulative filter flow vs. pore diameter - Pore size distribution vs. pore diameter - Number pore size distribution vs. average pore diameter - Surface area - Pore-size parameters En ligne : https://drive.google.com/file/d/1fGKd1bf8KpV_CnsPhEfuyphKtiGyq6x2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23229 [article]

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Characterization of goat leather structure using a metallographic technique / Huayong Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 23-29 Titre : Characterization of goat leather structure using a metallographic technique Type de document : texte imprimé Auteurs : Huayong Zhang, Auteur ; Lu Hongwang, Auteur ; Zan Yongli, Auteur ; Yongmei Xia, Auteur ; Tianduo Li, Auteur Année de publication : 2015 Article en page(s) : p. 23-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Cuir -- Structure Cuirs et peaux -- Analyse Cuirs et peaux de chèvres Microscopie électronique à balayage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A series of cross sections of the goal bluestock using a metallographic technique were first examined with a scanning electron microscopy (SEM) in the back-scattered electrons (BSE) mode and an optical microscope with oblique illumination. Through analyzing and comparing the images obtained in different modes, the different patterns of leather structure were illustrated in detail. The advantages and disadvantages of various examination methods were explained. Note de contenu : - Characteristic of the SEM images of leather samples via metallographic sample preparation - Comparison of the images obtained by SEM and optical microscope - Comparison of the images obtained by optical microscope with vertical illumination and oblique illumination En ligne : https://drive.google.com/file/d/1SHT5App3a5WbHZm-K_JXDxk6jgbVP-0L/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23230 [article]

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Air permeability and moisture penetration performance of leather from a microscopic view / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 30-32 Titre : Air permeability and moisture penetration performance of leather from a microscopic view Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Jiang Xuewei, Auteur ; Liu Jiajun, Auteur ; Xu Wei, Auteur Année de publication : 2015 Article en page(s) : p. 30-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène -- Détérioration Cuirs et peaux -- Analyse Cuirs et peaux -- Détérioration Microscopie Perméabilité Simulation par ordinateur Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, the microscopic spatial structure change of natural leather collagen Ill (i.e. 1bkv collagen) was simulated using Tinker software. The dynamics of the process for 1bkv [amino acid sequence number of Type III collagen] collagen was simulated at 300K, 320K, 340K and 360K, Through a series of analyses we find that Rg (radius of gyration) of all of the atoms of 1bkv collagen molecules increases with the increase of chosen temperature, and its average value decreases from 24.9Ã… to 21.0Ã…. Considering this along with the simulation trajectory of dynamics at different temperatures, people can find that the molecular chains of collagen gradually will become curved, and there's a large degree of bending at 360K. This is further evidence that the atomic distance between collagen molecules is getting smaller with the increase of the experimental set temperature, and it can also explain the mechanism of performance degradation of natural leather. Note de contenu : - EXPERIMENTAL PRINCIPLE - EXPERIMENTAL TOOLS - RESULTS AND DISCUSSION : Change with time of 1bkv collagen's value of Rg for all the atoms at different temperatures - The trajectory of 1bkv collagen at different temperatures En ligne : https://drive.google.com/file/d/1r-Il8X57OmRFYR_VvW63MCguMFHZyfl4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23231 [article]

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Effect of chrome content in the chrome tanning liquid of the leather tanning machine on the properties of leather / Wang Xue-Chuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 33-38 Titre : Effect of chrome content in the chrome tanning liquid of the leather tanning machine on the properties of leather Type de document : texte imprimé Auteurs : Wang Xue-Chuan, Auteur ; Zhang Feifei, Auteur ; Qiang Tao-Tao, Auteur ; Xi Ying, Auteur Année de publication : 2015 Article en page(s) : p. 33-38 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de tannage -- Teneur en chrome Caractérisation Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Mesure Tannage -- Appareils et matériels Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The effect of chrome content in chrome tanning liquid on the physical and mechanical properties of leather when using the specially designed leather tanning machine were studied and the leather was characterized by EDS and SEM. The results showed that, considering the chrome content in leather and the physical and mechanical properties of leather, the best chrome content in the chrome tanning liquid was 16g/L. The EDS results showed that the distribution of chrome in leather was relatively uniform. The SEM results showed that the collagen fibre dispersion of leather tanned with the leather tanning machine was better than the leather tanned by drum. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Equipment - Experiment operation - Testing characterization - RESULTS AND DISCUSSION : The effect of chrome content in chrome tanning liquid on the shrinkage temperature of leather - The effect of chrome content in chrome tanning liquid on physical and mechanical properties of leather - EDS analysis - SEM analysis En ligne : https://drive.google.com/file/d/1UTIWJ4VvzIQFcgthQU-xPoAjPPglqI3m/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23232 [article]

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Adsorption kinetics of collagen fibre toward Cr(III) / Yang Chengjie in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 39-46 Titre : Adsorption kinetics of collagen fibre toward Cr(III) Type de document : texte imprimé Auteurs : Yang Chengjie, Auteur ; Chen Jie, Auteur ; Liu Haiteng, Auteur ; Jia Jizhang, Auteur Année de publication : 2015 Article en page(s) : p. 39-46 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Collagen fibre is used to simulate the chrome tanning of pickled hide. The adsorption properties of collagen fibre toward Cr(III) under different conditions were analyzed. The adsorption kinetic of the collagen fibre toward Cr(IlI) was studied. The Lagrange pseudo-first-order kinetic model, pseudo-second-order kinetic model and intra-particle diffusion model were employed to study the adsorption kinetics behaviour. FT-IR, SEM-EDS, XRD, TGA and fon distributor analysis were employed to characterize the difference between collagen fibre and Cr(III) leather collagen fibre. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Apparatus - Preparation of collagen fibre - Adsorption experiments - Characterization - RESULTS AND DISCUSSION : Effect of reaction condition - Adsorption kinetics of collagen toward Cr(III) - CHARACTERIZATION : The IR spectra of CF and CF-Cr - The SEM-EDS analysis of CF and CF-Cr - The XRD spectra of CF and CF-Cf - The TGA analysis of CF and CF-Cr(III) En ligne : https://drive.google.com/file/d/18ECNmLdodmYtivtV0fo5b4e7DV_kgvAQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23233 [article]

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