Dépouillements

A systematic study on the role of chilling temperatures on the curing efficacy of hides and skins / Chandra Babu Narasimhan Kannan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 11 (11/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 11 (11/2012) . - p. 362-374 Titre : A systematic study on the role of chilling temperatures on the curing efficacy of hides and skins Type de document : texte imprimé Auteurs : Chandra Babu Narasimhan Kannan, Auteur ; R. Karthikeyan, Auteur Année de publication : 2012 Article en page(s) : p. 362-374 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Conservation Entreposage frigorifique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chilling is considered an alternative curing method for salt-free short-term preservation of hides and skins, but no systematic studies has been carried out with this method. In the present study, an attempt was made to investigate the role of chilling temperatures on the preservation efficacy. The experiments were done in a cold temperature cabinet using goat skins and cow hides. The samples of the hides and skins, chilled to different temperatures, were analyzed for the bacterial count, soluble nitrogen and hydroxyproline. The data suggested that 4oC is the optimum temperature for 7 days storage. The results of the chilling profile study indicate the need for a blast chiller to chill down to the target temperature in less than 2 hours in order to minimize the chance for bacterial damage. The optical microscopic studies of the chilled hides and skins at different temperatures show that the fiber compaction increases with the decrease in temperature compared to the skins preserved with common salt. The leathers produced had also the required qualities and strength properties to fulfill the trade requirements as evidenced from the organoleptic assessment, physical testing and scanning electron microscopic studies. Note de contenu : - MATERIALS AND METHODS : Effect of chilling temperature on the curing efficacy - Determination of bacterial count - Determination of soluble nitrogen content in chilled hides and skins - Determination of soluble hydroxyproline content in chilled hides and skins - Determination of shrinkage temperature - Histological studies on chilled hides and skins - Processing of chilled hides and skins into leathers - SEM studies on leathers - Physical testing and organoleptic assessment of the leathers - RESULTS AND DISCUSSION : Assessment of curing efficacy of chilling method - Subjective assessment of preserved hides and skins - Soluble nitrogen and hydroxyproline contents in the hides and skins - Assessment of curing efficacy by bacterial count - The effect of chilling on the hydrothermal stability - Chilling and warming (natural) profiles of cow sides for different temperatures - Histological studies on chilled skins and sides - Effect of chilling on the fiber structure of leather - Effect of chilling method on the quality of the leathers En ligne : https://drive.google.com/file/d/1msBbK3ax-I30R0ID6kmQxHzQDixkqLmZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16520 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
14323	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Production of high carbon ferrochromium alloy from footwear leather waste ash through a carbothermic reduction in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 11 (11/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 11 (11/2012) . - p. 375-383 Titre : Production of high carbon ferrochromium alloy from footwear leather waste ash through a carbothermic reduction Type de document : texte imprimé Année de publication : 2012 Article en page(s) : p. 375-383 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliage fer-chrome Carbone Chrome -- Recyclage Combustion Cuirs et peaux -- Déchets -- Recyclage Energie Incinération Oxydes de chrome Thermodynamique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The majority of hazardous solid waste generated in “Rio Grande do Sul” State, Brazil, is produced from footwear leather industry. Thermal treatment leather waste is considered as a good alternative to deal with this problem, by generating energy. It is also possible to recover chromium from the ash generated during incineration. The aim of this work is to evaluate high carbon ferrochromium alloy production from leather waste ash, through computational and laboratory analysis. Computational thermodynamics was used to simulate ash Cr2O3 carbothermic reduction and to determine composition of the laboratory alloys. Several runs were done using a laboratory furnace at 1600oC to get ferrochromium alloys from the ashes. Different kinds of analyses were done to determine alloys and slags compositions. It was demonstrated that it is possible to use the chromium from leather waste ash for a production of high carbon ferrochromium alloy through carbothermic reduction at 1600oC. The results obtained showed a new opportunity for hazardous solid waste management of the leather industry, in the context of energy generation from combustion of leather waste. The computational thermodynamics simulations presented good agreement with experimental results. Note de contenu : - METHODOLOGY : Materials - Experimental procedure and apparatus - Thermodynamic simulations - RESULTS AND DISCUSSION : Equipment reproducibility - Chromium - Phosphorus - Sulphur - Silica - Carbon - Other elements - Conversion En ligne : https://drive.google.com/file/d/1KUS1CjDnYl6rTS_ZbsygJpyL71JCQYd_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16521 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
14323	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Quantifying uncertainty for the determination of formaldehyde in leather by colorimetric method / Rajkumar Dewani in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 11 (11/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 11 (11/2012) . - p. 384-393 Titre : Quantifying uncertainty for the determination of formaldehyde in leather by colorimetric method Type de document : texte imprimé Auteurs : Rajkumar Dewani, Auteur ; Farman Ahmed, Auteur ; Muhammad Saleemuddin, Auteur ; Munawwer Rasheed, Auteur ; Muhammad Kashif Pervez, Auteur ; Sarwat Jahan Mahboob, Auteur Année de publication : 2012 Article en page(s) : p. 384-393 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorimétrie Cuir -- Teneur en formaldéhyde Cuirs et peaux -- Analyse Dichromate de potassium Etalonnage Incertitude de mesure Volumétrie (chimie analytique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The uncertainty in the analysis of formaldehyde in leather by colorimetric method was investigated and estimated according to ISO 17025 requirements. A total of sixteen various components contributing to the uncertainty of analysis result were identified and quantified, with separate uncertainty budgets. Among them, seven were related to volumetric measurements whereas the other nine were non volumetric. The study suggests that repeatability holds the largest uncertainty followed by formaldehyde recovery and standard calibration curve, while molecular weight and purity of potassium dichromate held the lowest uncertainty. Under carefully controlled experimental conditions the expanded uncertainty of the result is found to be plus or minus 0.676 mg/kg for a mass fraction of 30.73 mg/kg of formaldehyde in leather. Furthermore, the affect of uncertainty contribution from standard calibration curve and extraction temperature on the expanded uncertainty is explored to formulate valid suggestions for regulating the combined standard uncertainty. Note de contenu : - ANALYTICAL PROCEDURE : Definitionof the measurand - Identification of uncertainty sources - Non-volumetric sources - Volumetric sources - EXPERIMENTAL : Standards and reagents - Calibration - Application example - Bias study - Additional aspects En ligne : https://drive.google.com/file/d/15iGpLQCQ9w7qg3bDE8W7K_JS1y4V6IsK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16522 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
14323	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Ultrasound extraction of valonea tannin and its effects on extraction yield / Cigdem Kilicarislan Ozkan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 11 (11/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 11 (11/2012) . - p. 394-403 Titre : Ultrasound extraction of valonea tannin and its effects on extraction yield Type de document : texte imprimé Auteurs : Cigdem Kilicarislan Ozkan, Auteur ; Hasan Ozgunay, Auteur Année de publication : 2012 Article en page(s) : p. 394-403 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Extraction par ultrasons Tanins végétaux Ultrasons Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ultrasound extraction of valonea tannin from the acorn cups of the Quercus species was investigated and compared to the conventional extraction method. Effects of ultrasonic power, time and temperature on extraction were examined. Considering the highest extraction yields and tannin contents of two extraction methods, it was found out that ultrasound extraction result in 17.16% increase in extraction yield and 6.61% in tannin amount. Additionally, apart from the temperature study, the sound effect on extraction yields that occurred during ultrasound extractions was also determined. The results were evaluated statistically by using One-Way ANOVA and Duncan tests with the SPSS 15 statistic program. The results showed that ultrasonic extraction method can be used as an alternative to conventional method for extraction of tannin (valonea) from acorn cups. Note de contenu : - MATERIALS AND METHODS : Material - Methods : Determination of moisture content of acorn cups - Determination of maxiumm extractable material (MEM) - Extractions - Conventional extraction of acorn cups - Ultrasonic extraction of acorn cups - Tannin analysis - Statistical analysis - RESULTS AND DISCUSSION : Moisture content and maximum extractable material (MEM) of acorn cups - Extraction yield and tannin content of acorn cups by conventional method - Extraction yield and tannin content of acorn cups by ultrasonic method En ligne : https://drive.google.com/file/d/17U5clEtm8VNQRynXfOlVYHfKEh5P8nvE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16523 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
14323	-	Périodique	Bibliothèque principale	Documentaires	Disponible