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675.2 : Préparation du cuir naturel. Tannage |
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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)
[article]
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 Ultrasound assisted diffusion in vegetable tanning for leather processing / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 10 (10/2008)
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Titre : Ultrasound assisted diffusion in vegetable tanning for leather processing Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; M. V. Harikrishnan, Auteur ; K. Gopi, Auteur Année de publication : 2008 Article en page(s) : p. 330-337 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Vegetable tanning is one of the more versatile tanning methodologies involving natural materials. The problem associated with this tanning method is that it takes longer time for diffusion of vegetable tanning agents (VTA) thoug the pelt matrix. Therefore, there is a pressing need to transform this traditional eco-friendly tanning process into a tanner friendly efficient methodology by way of augmentation techniques such as the use of ultrasound. In the present paper, influence of ultrasound on vegetable tanning process has been studied. The influence of important process parameters such as process time, ultrasonic power, pre-tanning on VTA uptake has been investigated. The effect of ultrasonic power on shrinkage temperature of tanned leather has also been studied. The results indicate that there is a significant enchancement in vegetable tanning process due to the use of ultrasound. There is about 30-40 % increase in % uptake of VTA of VTA due to the use of ultrasound for 120-210 watts. In order to find out the possible mechanism for the enhancement with ultrasound, effect of pre-sonication of substrate (pelt matrix) as well as substance (VTA) has been studied. There is an appreciable reduction in the particle-size of VTA due to sonicationprior to tanning process aiding penetration. diffusion coefficient (D) of VTA during the tanning process has been calculated from the experimental data which indicates nearly two fold increase in the D value 2.64 x 10-5 cm2/sec) due to ultrasound under the given process conditions. Therefore, ultrasound application in vegetable tanning proccess could improve the diffusion rate leading to significant savings in process time and enhancementn in quality of the tanned leather. This methodology can be easily adopted in existing paddle or tanning pit systems for large scale production. Hence, this novel technique is a viable option for tanners in near future. En ligne : https://drive.google.com/file/d/1oPyAT4I2Qw5rbeLgjuo6crxAzjyIEY41/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2409
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Code-barres Cote Support Localisation Section Disponibilité 010719 - Périodique Bibliothèque principale Documentaires Disponible Ultrasound assisted enhancement in wattle bark (Acacia Mollissima) vegetable tanning extraction for leather processing / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 11 (11/2009)
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Titre : Ultrasound assisted enhancement in wattle bark (Acacia Mollissima) vegetable tanning extraction for leather processing Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; G. Swaminathan ; P. Srinandini ; V. Shriram ; J. Jayapriya, Auteur Année de publication : 2009 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux
TannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This paper analyzes the effect of ultrasound on a batch wattle bark tannin extraction process. Extraction from wattle bark presents a unique case of a two-component system in the form of condensed tannins and non-tannins. Hence, quantitative analysis of tannin content in the extract by spectrophotometery as well as total extracts analysis has been performed. The influence of various process parameters such as ultrasonic power, time, agitation and temperature on extraction has been studied. The results show significant 2-3 and 1.2-1.7 fold improvement respectively for total extract and tannin content due to the use of ultrasound 40-120 W as compared to control at 30°C suggesting mass transfer enhancement in leaching of strongly bound tannins from wattle bark due to ultrasound. The results indicate total extract and tannins obtained in ultrasonic process (80 W), devoid of external heating is better than control at 30°C. Better total extraction and comparable tannin content obtained using ultrasound, 120 W when compared to control at 60°C. Efficacy of tannin extract has been analyzed which indicates significant improvement in rate of tannin uptake for ultrasonic extract as compared to control extract by the bovine pelt. Therefore, the present study clearly indicates use of ultrasond in wattle tannin extraction is a viable enhancement with added advantages even dispensing with external heating. En ligne : https://drive.google.com/file/d/1SVkD-hx9VgcIZye6wptdeVMBzrgq1YDQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6386
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Code-barres Cote Support Localisation Section Disponibilité 011708 - Périodique Bibliothèque principale Documentaires Disponible Ultrasound-assisted process intensification in leather making : diffusion rate enhancement in retanning process / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 7 (07/2013)
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Titre : Ultrasound-assisted process intensification in leather making : diffusion rate enhancement in retanning process Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; P. T. Anusha, Auteur ; Radhika Narayan, Auteur ; M. Shravya, Auteur Année de publication : 2013 Article en page(s) : p. 277-287 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Cuirs et peaux
Cuirs et peaux -- Finition
Diffusion (physique)
Granulométrie
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Phénols
Polyacryliques
Retannage
Statistique
Syntans
UltrasonsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Retanning is one of the essential steps in leather processing. It follows the primary tanning process, utilizing synthetic tanning agents (syntans) in order to impart certain functional properties to the final leather. This research study aimed at investigating the effect of ultrasound (US) on the uptake of syntans in the retanning process as compared to magnetic stirring (MS) process control. Different types of syntans based on phenolic, melamine resin and acrylic compound were investigated. The influence of process parameters such as US power, process time, float, syntan offer, US pulse mode were studied. The effects of pre-sonication of substrate (leather) as well as substance (syntan solution though particle size analysis) were also investigated. There was the possibility of about 10% to 60% increase in exhaustion due to the use of US over MS for different syntans under various process conditions. The Apparent Diffusion coefficient (D) of syntan through the leather matrix was calculated from the experimental uptake data, which indicates significant improvement (~1.5 times) in the D value due to US over MS under the given process conditions. Therefore, the present study clearly indicates positive influence of ultrasound on diffusion of these special types of organic compounds (syntans) through more complex porous matrix such as leather, leading to significant improvements in diffusion rate of syntans, considerable savings in process time and subsequent enhancement in the quality of retanned leathers. Note de contenu : - Ultrasound in leather application
- Experimental set-up
- Process details (all the % based on shaved wet-blue weight) - Analytical procedure
- Calculation of process intensification parameters enhancement in uptake of retanning agents
- Diffusion co-efficient of syntans through leather matrix
- Effect of process parameters, effect of ultrasound and type of syntan on uptake on syntan
- Effect of ultrasound on apparent diffusion coefficient of syntans - Effect of ultrasound on substrate : pre-sonication of leather
- Effect of ultrasound on substance : particle-size analysis of syntans - Effect of ultrasound pulse mode
- Effect of combination of syntans
- Effect of retanning with two pieces
- Effect of ultrasound and type of syntan on uptake on syntan (a. phenolic syntan, b. melamine resin syntan, c. acrylic syntan)
- Statistical analysisEn ligne : https://drive.google.com/file/d/1nEKS3fHXRhiWa_xxak8YLWRhXXNFjYET/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19012
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Code-barres Cote Support Localisation Section Disponibilité 15337 - Périodique Bibliothèque principale Documentaires Disponible Ultrasound assisted vegetable tannin extraction from myrobalan nuts for leather application / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 2 (02/2018)
[article]
Titre : Ultrasound assisted vegetable tannin extraction from myrobalan nuts for leather application Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; A. Princess, Auteur ; C. Veena ; R. Lakshmi Devi Année de publication : 2018 Article en page(s) : p. 53-58 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eau
Essais (technologie)
Extraction par solvant
Extraction par ultrasons
Myrobalan et constituants
Tanins végétaux
Tannage végétal -- AnalyseIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Ultrasound (US) assisted preparation of tannins from Terminalia Chebula nuts (myrobalan) through solid-liquid extraction process using water as solvent even dispensing with conventional heating/stirring is presented in this paper. The results indicate there is a significant enhancement in myrobalan extraction due to the influence of US, in extract %yield and tannin contents respectively as compared to different control processes (static/stirring). Whereas, ultrasound probe at 120 W in 50°C water bath gave the best overall %yield and tanning content. Some of the important scale-up parameters could be a significant savings of 427,184 and 188 kg per ton of raw material usage as extrapolated values based on Lab-scale results in terms of % yield, tannin content and tanning agent offer respectively due to the use of US as compared to control process. The process involves : i). Clean technology with physical activation (US) in aqueous medium at ambient condition - no additional chemicals ii). Green and Eco-benign process with natural materials - useful in all extract applications, iii. Tannins extract as generic product for better functional properties, iv). Better diffusion of plant extract through skin matrix in tanning process for leather making, v). Sustainable solution and ecoconservation through better yields Note de contenu : - EXPERIMENTAL : Experimental Set up - Experimental Procedure - Tanning Trials - Analytical methods - Quantitative analysis of tannin content
- RESULTS AND DISCUSSIONS : Myrobalan extraction in ultrasonic tank - Effect of extraction in US probe - Effect of US power, temperature and stirring in extration - Enhancement factors for myrobalan extraction with ultrasound - Effect of distance of material from US probe tip - Mechanism tor the ultrasound assisted extraction - Two-stage extraction - Efficacy of extract in tanning process - Experimental results and process scale-up considerationsEn ligne : https://drive.google.com/file/d/1Nfgs9Mp-HnCkG6Q4zlf4t-oXsI-oBK3b/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29951
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Code-barres Cote Support Localisation Section Disponibilité 19539 - Périodique Bibliothèque principale Documentaires Disponible Ultrasound extraction of valonea tannin. Part II : Effects on tannin structure and tanning ability in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 2 (02/2013)
PermalinkUnderlying principles in chrome tanning : Part 1. Conceptual design of pickle-less tanning / Wondu Legesse in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 12 (12/2002)
PermalinkUnderlying principles in chrome tanning : Part 2. Underpinning mechanism in pickle-less tanning / Palanisamy Thanikaivelan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 2 (02/2004)
PermalinkUnderstanding the basics of tanning / Bokamoso Mmapatsi in LEATHER INTERNATIONAL, Vol. 213, N° 4813 (08/2011)
PermalinkUnhairing method identified as source of n-nitrosodimethylamine in tannery atmosphere / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)
PermalinkUnique biocide for the leather industry ; essential oil of oregano / Eser Eke Bayramoglu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 11 (11/2007)
PermalinkUpgrading of rural garad-tanned crust leathers / A. E. Musa in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 1 (01-02/2012)
PermalinkUse of alternative energy sources in tanneries / Luisa F. Cabeza in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 3 (05-06/2007)
PermalinkUse of an elastomer formed in situ for softening leather / F. Scholnick in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 8 (08/1994)
PermalinkUse of Cangilones drums to give water and energy savings in the beamhouse / Josep Maria Morera in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 1 (01-02/2007)
PermalinkUse of poly(vinyl stearate) for fatliquoring / F. Scholnick in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVIII, N° 1 (10/1993)
PermalinkUse of silk hydrolysate in chrome tanning / G. Itirli Aslan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 5 (09-10/2014)
PermalinkUse of TOC as an alternative to COD for monitoring the biooxidation of tannery unhairing waste / J. E. Cooper in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXV (Année 1980)
PermalinkUses for chrome leather waste - Chromium-enriched brewers yeast in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 1 (01-02/2006)
PermalinkUsing ashes from incineration of chromium sulphate tanned leather scrap - Part 1 : Characterization of ashes and chromium extraction in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 6 (11-12/2000)
PermalinkUsing ashes from incineration of chromium sulphate tanned leather scrap. Part 2 : Tanning liquors, additives in footwear adhesives and fillers in mortars / M. J. Ferreira in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 6 (11-12/2001)
PermalinkUtilisation of effluent sludges from Sidi Khalifa tannery, Libya / A. Bilyk in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 72 (Année 1988)
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)
PermalinkPermalinkUtilization of calcium alginate beads as adsorbent for removal of dyes from tannery wastewaters / Rathinam Aravindhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 6 (06/2006)
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