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Accelerated liming process using phase transfer catalyst / N. Vedaraman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 5 (05/2016)
[article]
Titre : Accelerated liming process using phase transfer catalyst Type de document : texte imprimé Auteurs : N. Vedaraman, Auteur ; K. V. Sandhya, Auteur ; K. C. Velappan, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2016 Article en page(s) : p. 171-177 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Catalyse par transfert de phase
Chaulage
Cuirs et peaux de chèvres
Gonflement (physique)
Hydroxyde de tétraméthylammonium
Productivité
Travail de rivière (cuir)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the present work, effect of using phase transfer catalysts (PTC) was studied in liming and re-liming processes of goat skin, for decrease in the processing time, thereby increasing productivity. Three different Phase Transfer Catalysts; Tetramethylammonium Hydroxide (TMAH), Tetraethylammonium Hydroxide (TEAH) and Tetrabutylammonium Hydroxide (TBAH) were chosen and experiments were conducted on liming and re-liming of goat skin to select suitable catalyst in comparison with the conventional liming process. The monitoring parameters were ease of hair removal and increase in pelt weight to find the maximum swelling and plumping. After determining the optimal PTC amount, studies were also carried out on reuse of liquor containing PTC with replenishment. Use of TMAH in liming process was found to bring about significant time reduction and could bring improved swelling in liming and re-liming processes. Note de contenu : - EXPERIMENTAL : Materials - Method - Liming of goat skin using three different phase transfer catalysts - Optimization of amount of TMAH required for liming process - Reusing of lime liquor with additional TMAH replenishment - The effect of TMAH in re-liming of goat skin - Reusing of relime liquor with additional TMAH replenishment
- RESULTS AND DISCUSSION : Average value of three experiments - Average value of three evaluationsEn ligne : https://drive.google.com/file/d/17eQLi6rCFWCWdf0pdsh3ByZsXHrPt3Sh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26218
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 5 (05/2016) . - p. 171-177[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18051 - Périodique Bibliothèque principale Documentaires Disponible Action of pancreatin on residual epidermis of goatskin-examination via histological changes during bating / Ding Haiyan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 4 (07-08/2005)
[article]
Titre : Action of pancreatin on residual epidermis of goatskin-examination via histological changes during bating Type de document : texte imprimé Auteurs : Ding Haiyan, Auteur ; Liegang Sun, Auteur ; Liang Chengjian, Auteur Année de publication : 2005 Article en page(s) : p. 141-144 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Cuirs et peaux -- Analyse
Cuirs et peaux de chèvres
Epiderme
Pancréatine
Peau -- HistologieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The histological changes of the epidermis of goatskin under different bating conditions were observed at the ultrastructure level by TEM and SEM. The results showed that the residual epidermal matter was obviously removed from the surface of delimed pelt by pancreatin in the normal bating process and this action will be strengthened by both an increase of the amount of pancreatin and by prolonging the bating time. Evidence is provided of the function of pancreatin in bating, eliminating scud and clarifying the grain surface. Note de contenu : - Sample preparation
- Sampling and fixation
- Specimen preparation for TEM
- Specimen preparation for SEMEn ligne : https://drive.google.com/file/d/1QycDHpTwbj8x1N0qDVsipv-7Dub3lvSU/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39244
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 4 (07-08/2005) . - p. 141-144[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Aluminum tanning of hide powder and skin pieces under microwave irradiation / Yue Liu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)
[article]
Titre : Aluminum tanning of hide powder and skin pieces under microwave irradiation Type de document : texte imprimé Auteurs : Yue Liu, Auteur ; Bin Song, Auteur ; Jinwei Zhang, Auteur ; Carmen Gaidau, Auteur ; Haibin Gu, Auteur Année de publication : 2020 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Analyse thermique
Cuirs et peaux
Cuirs et peaux de chèvres
Eaux usées -- Analyse
Fourier, Spectroscopie infrarouge à transformée de
Micro-ondes
Microscopie électronique à balayage
Poudre de peaux
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium
ThermogravimétrieIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The application and mechanism study of microwave irradiation in traditional industries have attracted considerable attention owing to the unique thermal and athermal effects that could lead to unexpected benefits in high-efficiency and clean production. Herein, we report the investigation of the aluminum tanning under microwave irradiation upon using hide powder and skin pieces, respectively, as simulants of real hide or skin. The aluminum tanning process and the tanned products under microwave heating (MWH) were studied and compared with those of conventional water bath heating (WBH) as the controls. For the tanning system of hide powder, the tanning effluents were analyzed in terms of pH, conductivity, dielectric constant and aluminum content, and the tanned powder was investigated by differential scanning calorimetry (DSC), thermogravimetric (TG) analysis, and FT-IR spectroscopy. For the skin piece system, the pH and aluminum content of tanning effluents were also determined, and at the same time, DSC, TG, SEM, FT-IR and shrinkage temperature were used to illustrate the actions of microwaves on the structure and properties of the tanned pieces. The results show that aluminum reactivity in the penetration and binding process of collagen fibers in hide powder and skin pieces improved using microwave treatment. The residual aluminum content was greatly reduced by microwave heating action, and the increased amount of aluminum with evener distribution was observed in the tanned products. Microwave irradiation also resulted in the tanned products with better thermal stability and thermal decomposition resistance. This work further promotes application of microwave treatments for aluminum-based tanning in leather industry. Note de contenu : - EXPERIMENTAL : Materials - Aluminum tanning of hide powder - Aluminum tanning of goatskin pieces - Analysis of tanning effluent, tanned hide powder and skin pieces
- RESULTS AND DISCUSSION : Effect of microwave irradiation on the aluminum tanning of hide powder - Effect of microwave irradiation on the aluminum tanning of skin pieces
- Table 1 : Analysis for the tanning effluents of hide powder under different heating methods
- Table 2 : TG analysis of tanned hide powder obtained under different heating methodsDOI : https://doi.org/10.1186/s42825-020-00037-w En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00037-w.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37456
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 13 p.[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire An experimental comparative study of the effect of skin type on the stability of vegetable leather under acidic condition / Alireza Koochakzaei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 11 (11/2018)
[article]
Titre : An experimental comparative study of the effect of skin type on the stability of vegetable leather under acidic condition Type de document : texte imprimé Auteurs : Alireza Koochakzaei, Auteur ; Hossein Ahmadi, Auteur ; Shadpour Mallakpour Année de publication : 2018 Article en page(s) : p. 345-351 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Colorimétrie
Cuir végétal
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de chèvres
Cuirs et peaux de moutons
Essais accélérés (technologie)
Etudes comparatives
Extraction (chimie)
Mimosa et constituants
pH -- Mesure
Tanins végétaux
Température de retraitIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Vegetable tanned leather is very sensitive to environmental factors, especially acidic pollutants. In addition to environmental factors, the type of animal and tannin consumed highly influences the structure and deterioration of leather. Therefore, this comparative study aimed at evaluating the stability of sheep and goat leather, tanned with mimosa extract, during the accelerated aging process. The leathers were submitted to accelerated aging for two weeks at 40°C, 50% RH and 100 ppm SO2 concentration. The attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, colorimetry, fiber-optics reflectance spectroscopy (FORS), pH measurements, investigation of mechanical properties and shrinkage temperature (Ts) were used to investigate influence of the accelerated aging condition on physical and chemical properties of leather. Results showed that sheep leather has better structural stability against acidic deterioration with compared to goat leather. While, goat leather showed higher color stability than sheep leather. Moreover, results revealed that deterioration level in grain layer was more severe than corium. Note de contenu : - Samples preparation and accelerated aging
- ATR-FTIR
- Tannins extraction from leather and UV-Vis spectroscopy
- Colorimetry
- Fibre-optics reflectance spectroscopy (FORS)
- pH measurement shrinkage temperature
- Mechanical propertiesEn ligne : https://drive.google.com/file/d/1eexKpyKxbX_ihP6bvwHI2Of8KgkNT6cw/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31200
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 11 (11/2018) . - p. 345-351[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20339 - Périodique Bibliothèque principale Documentaires Disponible An integrated eco-friendly tanning method for the manufacture of upper leathers from goatskins / Subramanian Saravanabhavan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 4 (07-08/2003)
[article]
Titre : An integrated eco-friendly tanning method for the manufacture of upper leathers from goatskins Type de document : texte imprimé Auteurs : Subramanian Saravanabhavan, Auteur ; Rathinam Aravindhan, Auteur ; Palanisamy Thanikaivelan, Auteur ; B. Chandrasekaran, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2003 Article en page(s) : p. 149-158 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coût-Efficacité
Cuir -- teneur en chrome
Cuirs et peaux de chèvres
Déchets -- Réduction
Eau -- Consommation -- Réduction
Eaux usées -- Analyse
Epilage enzymatique
Tannage au chromeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Present leather-making processes cause difficulties, with regard to their perceived environmental impact. Pre-tanning and tanning processes contribute more than 90% of the total pollution load from leather processing.
Conventional process methods subject the skin to wide variations in pH. Such pH changes, lead to salt formation which results in a net increase in COD, TDS, chlorides, sulphates and chromium levels in tannery wastewaters.
In this study, a three-step process sequence has been explored to limit the pH range in leather processing to between 4.0-8.0. A sequence of operations, viz. enzyme unhairing, NaOH based fibre opening and pickle-less chrome tanning produces leathers matching the functional performance of conventionally processed leathers but leading to substantial environmental benefits in the reduction of COD and total solids by 43 and 70%, respectively. Water consumption for processing is reduced to 17.81/Kg raw hide. The process sequence explored appears to be economically viable.Note de contenu : - EXPERIMENTAL METHODS :
- Standardisation of dehairing process
- Standardisation of opening up of fibre bundles
- Experimental tanning process (E)
- Conventional tanning process (C, as followed in India)
- EXAMINATION OF THE LEATHERS :
- Input-output analysis
- Scanning electron microscopic examination
- RESULTS AND DISCUSSION :
- Standardisation of dehairing system
- Standardisation of NaOH for opening up of fibre bundles
- INTEGRATED THREE STEP TANNING PROCESS : AN APPRAISAL
- Softness measurements
- Scanning electron microscopic analysis
- Chromium in leather
- OBJECTIVE AND SUBJECTIVE METHODS OF EVALUATION OF THE LEATHER
- Strength characteristics
- Tactile properties
- Environmental benefits
- Techno-economic viability
- INPUT-OUTPUT AUDIT OF THE EXPERIMENTAL AND CONTROL PROCESS
control process
- Table 1 : Composition of depilatory mixture* for different methods of application
- Table 2 : Extent of swelling and cross section pH of the pelts from preliminary fibre opening trials
- Table 3 : Compression measurement and gradient data for control (C) and experimental (E) crust Leathers
- Table 4 : Comparison of chromium content in wet blue leathers from control (C) and experimental (E) processes
- Table 5 : Physical testing data of control (C) and experimental (E) leathers
- Table 6 : Composite liquor analysis
- Table 7 : Comparison of water requirement and discharge for control (C) and experimental (E) leather processing of 1 kg raw skins
- Table 8 : Time and power consumption for the conventional (C) and experimental tanning (E) processes
- Table 9 : Cost estimates of the conventional (C) and experimental tanning (E) processes
- Table 10 : Input-output audit for both control and experimental processEn ligne : https://drive.google.com/file/d/1jxj7vQuxr9IAA_lOPXzd04eZ-44Kkiva/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39771
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 4 (07-08/2003) . - p. 149-158[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Anti-ectoparasite activity of medicinal herbal plant in terms of reducing ectoparasites effect on sheep and goat skins / Fitsum Etefa Ahmed in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 11 (11/2023)
PermalinkAntibiotic susceptibility patterns of gram-negative moderately halophilic bacteria isolated from salted skins / Pinar Caglayan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 2 (03-04/2020)
PermalinkApplication of acid protease for eco-friendly pre-treatment of goat skin to improve antimicrobial finish using herbal natural extracts / Mona Vajpayee in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 6 (06/2023)
PermalinkApplication of an enzymatic bate from local materials / M. M. Ahmed in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 4 (07-08/2003)
PermalinkApplication of Y-shaped polyurethane and polyacrylic acid as a complex retanning agent in aldehyde-tanned goat leather / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 11 (11/2017)
PermalinkAugmentation of garment sheepskin type properties in goatskins : Role of chromium-silica tanning agent / N. N. Fathima in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 6 (11-12/2003)
PermalinkBiochemical and physical changes in goatskin during bacterial putrefaction / Vimudha Muralidharan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 6 (06/2021)
PermalinkBiodegradation of chrome-free goat garment leathers in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 2 (03-04/2012)
PermalinkCarbonization region measurement in vegetable tanned goat leather using machine vision system for evaluating performance measures of leather cut contour edges / S. Vasanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 2 (02/2022)
PermalinkChamois leathers - An approach for accelerated oxidation / Victor John Sundar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)
PermalinkCharacterization 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)
PermalinkChromium-keratin tanning compound - preparation, characterization and application in tanning process / R. Karthikeyan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 5 (05/2012)
PermalinkColoring sheepskins / Raymond Hart in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)
PermalinkA combination tannage based on aluminium and glycine-modified lignosulfonate / Zhou Jian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 5 (09-10/2011)
PermalinkA comparative study of uniaxial and biaxial breaking stress and strain profiles of goat upper / M. D. Naresh in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 2 (03-04/2001)
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