Application 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)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 4 (07-08/2003) . - p. 135-137 Titre : Application of an enzymatic bate from local materials Type de document : texte imprimé Auteurs : M. M. Ahmed, Auteur ; G. A. Gasmelseed, Auteur Année de publication : 2003 Article en page(s) : p. 135-137 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Confitage enzymatique Cuirs et peaux -- Propriétés chimiques Cuirs et peaux -- Propriétés physiques Cuirs et peaux de chèvres Cuirs et peaux de moutons Travail de rivière (cuir) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Over the years the enzymatic bating process for both hides and skins has become indispensable, it renders the leather soft, resilient and smooth. The basic raw materials for a bate have ranged from dog dung and pigeon faeces to synthetic enzymes. The application of the formerly used natural materials was difficult and the quality of the leather produced was not reproducible and was inconsistent. The skins might be over -bated or under -bated depending on the activity of the bate and the enzyme content of the material used. The current material used for the preparation of a bate is cow pancreas, blended with a carrier substance at a suitable concentration giving an activity of about 1300 units. The leather produced using such materials is compared with that produced using a widely applied commercial bating material (Oropon, Rohm and Haas) with regard to quality, strength and softness. Various compositions were used starting from 0.5% at increments of 0.25% to 1.5% based on limed weight. These trials were compared with a controlled experiment using 0.5% of the commercial bating material which has a strength of 1500 units as checked by the method of analysis adopted in this work (Appendix A). 72 wet-salted sheep and goat skins were divided equally into two groups, each group contained 6 skins of either type. The skins of the two groups were processed through soaking, unhairing, liming deliming, bating, pickling, chrome tannage, retannage, drying, and finishing. The leather produced is of good quality and it does not differ from the leather produced using imported bating materials. Note de contenu : - Producing the bate - Experimental work - Results and discussion : Summary of production - Application and results - Table 1 : Factors and their levels - Table 2 : Physical properties sheepskins - Table 3 : Physical properties of goat skins - Table 4 : Chemical properties of sheep skins En ligne : https://drive.google.com/file/d/1X0u0JoI8LOtbwsilfsGczdL9N62JX3XD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39768 [article]

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Chromium sulphate recovery in a triple-effect evaporator / G. A. Gasmelseed in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 1 (01-02/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 1 (01-02/2002) . - p. 26-29 Titre : Chromium sulphate recovery in a triple-effect evaporator Type de document : texte imprimé Auteurs : G. A. Gasmelseed, Auteur Année de publication : 2002 Article en page(s) : p. 26-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coût-Efficacité Cuirs et peaux -- Analyse Evaporation Modèles mathématiques Récupération (Déchets, etc.) Sulfate de chrome Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chromium sulphate is used extensively in Sudanese tanneries, however its exhaustion in processing is limited and a considerable quantity is passed as waste to the drain with consequent risk of pollution and environmental hazard. In this investigation spent chromium liquor was concentrated by evaporation in a triple-effect evaporator. The concentrated liquor was blended with fresh make-up chromium and re-used in tannage. The advantage of this process, in addition to its economical and environmental benefits is the continuous recovery with closed-loop recycling without loss of chromium to the drain. A complete control system is recommended. Note de contenu : - Method of operation - Mathematical model - Experimental work : Tannage 1-pickled pelts - Tannage 2-delimed pelts - Table 1 : Evaporator stage parameters - Table 2 : Properties of recycled chrome liquor before evaporation - Table 3 : Properties of recycled chrome liquor after evaporation (third stage) - Table 4 : Leather analysis, Recipe No. 1 - Table 5 : Leather analysis, Recipe No. 2 - Table 6 : Cost estimation per year En ligne : https://drive.google.com/file/d/1HJI6fDJYQEO-H5mpnngAVigGRrxR_L_9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40193 [article]

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Coloring of leather using henna - natural alternative material for dyeing / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 5 (05/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 5 (05/2009) . - p. 183-190 Titre : Coloring of leather using henna - natural alternative material for dyeing Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; Balaraman Madhan, Auteur ; W. Madhulatha, Auteur ; Jonnalagadda Raghava Rao, Auteur ; G. A. Gasmelseed, Auteur ; S. Sadulla, Auteur Année de publication : 2009 Article en page(s) : p. 183-190 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Synthetic dyes are widely used in the leather industry; some of these are carcinogenic in nature. Environmental concern leads one to seek dye products based on natural resources, which have several advantages like less toxicity, biodegradability, etc. The research work presented in this paper focuses on an eco-friendly dyeing process of the leather using aqueous henna leaves extract that contain lawsone, 2-hydroxy 1,4 naphthaquinone, the most prominent member of alpha – hydroxynaphthaquinone, natural dye class. The aqueous extraction from the henna leaves was studied and the best extraction conditions were found to be the maceration of the ground henna leaves in water, at temperature (> 80°C) for 60 minutes in a water bath without agitation. The color of the leather had become deeper with increasing amount of henna extract and multiple colors have been obtained depending on the type of mordants used. The henna dyeing had resulted in leathers with good rub (dry and wet) and perspiration fastness characteristics, while the light fastness characteristics were found to be moderate. En ligne : https://drive.google.com/file/d/1CW56u-TUPgTxFPrHbzc3eElLF5qzkeeO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5220 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011294	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Combination tanning system for manufacture of shoe upper leathers : cleaner tanning process / A. E. Musa in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 6 (11-12/2012)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 6 (11-12/2012) . - p. 239-245 Titre : Combination tanning system for manufacture of shoe upper leathers : cleaner tanning process Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; G. A. Gasmelseed, Auteur Année de publication : 2012 Article en page(s) : p. 239-245 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants Chaussures Déchets -- Réduction Sulfate de tétrakis hydroxyméthyl phosphonium Le sulfate de tétrakis hydroxyméthyl phosphonium est un myxobactéricide qui offre une prévention efficace contre les biofilms microbiens dans les eaux de traitement, et ce, pour une vaste gamme de micro-organismes formant des biofilms. Le sulfate de tétrakis (hydroxyméthyl) phosphonium agit principalement en augmentant la perméabilité de la membrane externe de l'enveloppe de la cellule microbienne, ce qui entraîne la libération rapide de protéines et d'autres substances cellulaires par les cellules. En outre, le sulfate de tétrakis (hydroxyméthyl) phosphonium inhibe le processus de sulfatoréduction dans les bactéries réductrices de sulfate. Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Tannage végétal Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Nowadays people are seeking natural products, and advocating the preparation of leather products from green chemicals. Therefore, it becomes an important task of chemists in leather manufacture to research and develop clean and green tanning agents to replace chromium-containing tanning agents. In this study, a combination tanning process based on garad powder (Acacia nilotica sub. sp. nilotica) and tetrakis hydroxymethyl phosphonium sulphate (THPS) for the production of upper leathers is presented as a cleaner alternative. Two tanning methods, garad followed by THPS (garad-THPS) and THPS followed by garad (THPS-garad), have been tried. The combination tannage, employing 20% garad powder and 1.5% THPS results in leathers with shrinkage temperatures of 100°C. The change in the order of addition of gard and THPS showed a marginal difference in thermal stability, but significant variations were observed in the physical characteristics of leathers. The combination tanning system provides a significant reduction in the discharge of total dissolved solids in the wastewater. The characteristics of the leathers indicate that the garad-THPS combination tanning system provided leathers with good organoleptic properties and comparable strength properties. The leathers were further characterized by chemical analysis. The work presented in this paper establishes the use of garad and THPS as an effective alternative cleaner tanning method. Note de contenu : - Materials - Garad-THPS combination tannage - Measurement of hydrothermal stability of leathers - Handle and appearance of the crust leather - Physical testing - Analysis of spent liquors from tanning trials - APPENDIX : data concerning author's comment on toxicity of chromium - Toxicity of Cr(III) reference - Analysis of exhaustion of tanning spent liquors - Safe disposal method for chrome leathers - Possible risks of THPS exposure - Chemical analysis En ligne : https://drive.google.com/file/d/1ANwnCAjinHnBByzF5RxC4vYLp57WVhEW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16803 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
14414	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Henna extract : Can it be an alternative retanning agent ? / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 6 (06/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 6 (06/2008) . - p. 188 - 193 Titre : Henna extract : Can it be an alternative retanning agent ? Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; G. A. Gasmelseed, Auteur ; S. Sadulla, Auteur ; W. Madhulatha, Auteur ; Balaraman Madhan, Auteur Année de publication : 2008 Article en page(s) : p. 188 - 193 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Extract from the leaves of lawsonia inermis (henna), widely distributed in Sudan, has been evaluated for its utilization in the retanning of the leather and presented in this paper. Leaves of henna have been extracted for 1 hour with distilled water (1:10 w/v) at temperature above 80°C. The henna extract prepared has been used for the retanning of wet blue leathers. The effectiveness of henna extract in retanning of wet blue leathers has been compared with wattle retanning. The organoleptic properties of the leathers viz. softness, fullness, grain smoothness, grain tightness (break), general appearance, uniformity of dyeing of henna retanned leather have been evaluated in comparison with wattle retanned leathers. Henna retanning resulted in leathers with good grain tightness. Dyeing characteristics of henna retanned leathers have been found to be better than wattle retanned leathers. Also physical strength characteristics, shrinkage temperature and economic viability were noted. The effluent arising from this retanning system has been analyzed for its environmental impact. En ligne : https://drive.google.com/file/d/1PjhdcJB92GZqU_JJ2W2U1YWRNlL1dv2g/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2562 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010401	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Recycling of unhairing lime liquors / K. Eldin A. Mohamaed in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 3 (05-06/2003)  

Permalink

Studies on combination tanning based on henna and oxazolidine / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 10 (10/2009)  

Permalink

Studies on the henna-glutaraldehyde combination tanning system / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 3 (03/2011)  

Permalink

Upgrading 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)  

Permalink

---

1 (1 - 9 / 9)