Dépouillements

Mathematical modelling of a vegetable tanning process / D. Sannino in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 4 (07-08/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 4 (07-08/2013) . - p. 139-144 Titre : Mathematical modelling of a vegetable tanning process Type de document : texte imprimé Auteurs : D. Sannino, Auteur ; V. Vaiano, Auteur ; P. Ciambelli, Auteur ; A. M. Manna, Auteur ; D. Caracciolo, Auteur ; Biagio Naviglio, Auteur ; Gianluigi Calvanese, Auteur Année de publication : 2013 Article en page(s) : p. 139-144 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Modèles mathématiques Tannage végétal Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this work a mathematical model of the vegetable tanning process under different operating conditions has been developed and validated. The mathematical model describes the tanning process as a series process involving tannin diffusion into the leather and subsequent reaction with collagen. The external diffusion has been assumed to be very fast because of the high rotation rate of the drum. The change of hide thickness was also considered by analyzing the experimental data. The mathematical model well describes tanning processes for most of the operating conditions examined. En ligne : https://drive.google.com/file/d/1Dx2YbE015iIibs4alKfu_UxwdXOP4MbE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19217 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15393	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Quantitative estimation of hair follicle patterns for leather surface using K-function (L-fonction) Method (i): influence of individual and location differences for goatskins on estimation of L-function / Satoru Dohshi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 4 (07-08/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 4 (07-08/2013) . - p. 145-148 Titre : Quantitative estimation of hair follicle patterns for leather surface using K-function (L-fonction) Method (i): influence of individual and location differences for goatskins on estimation of L-function Type de document : texte imprimé Auteurs : Satoru Dohshi, Auteur Année de publication : 2013 Article en page(s) : p. 145-148 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Comptage Cuirs et peaux -- Analyse Cuirs et peaux de chèvres Follicule pileux Fonctions L Microscopie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The purpose of this work was to investigate the influence of individual and location differences on the quantitative estimation of hair follicle patterns for goatskins using the K-function (L-function) method. Five pieces of chrome-tanned goatskins were used in this study. Hair follicle patterns of butt, shoulder and belly locations for goatskins were observed by a digital microscope and were quantitatively estimated using K-function (L-function) method. As a result, a characteristic L-function for goatskin was observed. No individual differences in hair follicle patterns of goatskins were observed for both observation images and quantitative estimation. On the other hand, since the mean distance betWeen two hair follicles for belly location was longer than those for butt and shoulder locations, small location differences were observed for goatskins. However, for ail samples and locations, the L-function seemed low by comparison with random distribution within the region of the existence of three guard hair follicles. In conclusion, it was found that a characteristic L-function for the hair follicle patterns of goatskin was observed and the K-function (L-function) method becomes a useful tool to quantitatively estimate hair follicle patterns of goatskins. Note de contenu : - Leather sample - Observation by microscope - K(r) (L(r)) method En ligne : https://drive.google.com/file/d/1F5MUEDoL23kRnghySvEOCZeYEKK5wv6P/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19218 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15393	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Rapid determination of six aldehydes in leathers by ultra performance liquid chromatography / Yu Lingyun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 4 (07-08/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 4 (07-08/2013) . - p. 149-153 Titre : Rapid determination of six aldehydes in leathers by ultra performance liquid chromatography Type de document : texte imprimé Auteurs : Yu Lingyun, Auteur ; Zhao Changsheng, Auteur ; Wu Mengru, Auteur ; Dong Wei, Auteur ; Liu Surui, Auteur ; Gou Yun, Auteur ; Jin Jing, Auteur ; Wen Yanqing, Auteur ; Lin Wei, Auteur Année de publication : 2013 Article en page(s) : p. 149-153 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aldéhydes Un aldéhyde est un composé organique, faisant partie de la famille des composés carbonylés, dont l'un des atomes de carbone primaire (relié au plus à 1 atome de carbone) de la chaîne carbonée porte un groupement carbonyle. L'aldéhyde le plus simple est le formaldéhyde (ou méthanal), aussi appelé formol lorsqu'il est en solution aqueuse. Un aldéhyde dérive formellement d'un alcool primaire (oxydation) dont le groupement hydroxyde -OH est en bout de chaîne et se forme suite à l'enlèvement de deux atomes H d'où le nom "alcool déshydrogéné" ou aldéhyde. Chromatographie en phase liquide à hautes performances Cuirs et peaux -- Analyse Extraction par ultrasons Ultrasons Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A simple pre-column derivatization method using (2,4-Dinitrophenylhydrazine, DNPH) as pre-column labeling reagent followed by ultra performance liquid chromatography (UPLC) with a Photo-Diode Array detector (PDA) has been developed for the determination of six aldehydes: glyoxal, formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, glutaraldehyde in leather samples. Acetonitrile and 0.1% sodium dodecyl benzene sulfonate aqueous solution (1:1, VN) was used for the ultrasonic extraction at 40°C. A derivatizing parameter — temperature was investigated in detail. Under optimal conditions, the quantification limits were obtained for the desired compounds ranging from 25 to 45pg P. The recoveries were higher than 90.6%. The proposed method was successfully applied to the determination of the target compounds in leather samples with a higher sensitivity than traditional high performance liquid chromatography (HPLC) and UV — visible scenery spectrophotometry (UV-Vis) methods. Note de contenu : - EXPERIMENTAL PROCEDURE : Apparatus - Reagents - Extraction - Derivatization procedure - UPLC conditions - Quantification - RESULTS AND DISCUSSION : Effect of reaction temperature on derivatization - Sample extraction - UPLC separation - Linearity and detection limit - Recoveries and precision - Comparison of the proposed method with standard methods - Application En ligne : https://drive.google.com/file/d/1KdBAVZn101fx86dKDDKiGZQMp3bo5wkG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19219 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15393	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Antimicrobial leather : preparation, characterization and application / Wang Zhiyuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 4 (07-08/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 4 (07-08/2013) . - p. 154-165 Titre : Antimicrobial leather : preparation, characterization and application Type de document : texte imprimé Auteurs : Wang Zhiyuan, Auteur ; Haibin Gu, Auteur ; Wuyong Chen, Auteur Année de publication : 2013 Article en page(s) : p. 154-165 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens Caractérisation Encapsulation Huile de clou de girofle Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In order to produce a new kind of functional antimicrobial leather, that has the lasting ability to kill or inhibit microorganisms, we investigated the preparation and properties of PU-microencapsulated clove oil (PU-MCO). Firstly, the microcapsules were prepared by interfacial polymerization using polyurethane (PU) as the wall material. Results of optimization experiments show that when the ratios of shell-core, PEG-TDI and 0/W phase are 1:3 (w/w), 1:3 (mol ratio) and 15:85(w/w), respectively, the PU-MCO emulsion obtained is very stable and the encapsulation rate of clove oil can reach 94.3%. Laser particle, zeta potential analyzer, SEM, FT-IR, TG and GC-MS were used to characterize its size, shape, structure, components and stability. Results indicate that the microcapsule particles assume the spherical shape with average size of 0.2-1.0unn, and the main content of clove oil is not significantly affected by the microencapsulation. However, its heat stability has greatly improved and the starting decomposition temperature can be improved to 110°C or so. Meanwhile, the microencapsulated clove oil shows a good controlled-release property. Results of antimicrobial tests reveal that, although the minimum inhibitory concentrations (MICs) of the microcapsule product are higher than that of crude clove oil, it still has sufficient antimicrobial activity against bacteria, yeasts and moulds. Finally, the PU-MCO was applied in retanning goat garment leather. The leather shows good antimicrobial property which persists for a long time at room temperature and is not significantly affected by perspiration or washing because of the firm physical and chemical combination between the PU wall material and leather fibres. Thus, using the microencapsulated natural clove oil, we successfully provided a feasible method to prepare an antimicrobial leather with a non-toxic nature and long-term effectiveness. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of PU-microencapsulated clove oil - Characterization of PU-microencapsulated clove oil (Particle size - Optical microscope - Scanning electron microscope (SEM) - Gas chromatography-mass spectrometry (GC-MS) - Encapsulation rate - FT-IR - Thermal analysis - Release property - Antimicrobial activity) - Application of PU-MCL to wet-blue (Shrinkage temperature (Ts) - Antimicrobial activity of crust leathers - Controlled-release test - Water-washing test - Perspiration test) - RESULTS AND DISCUSSION : Optimization of preparation conditions of PU-MCO (Particle size - Diversity and shape - GC-MS - FT-IR - TG and DSC - Release property - Antimicrobial activity) - Properties of antimicrobial leathers produced by PU-MCO (Antimicrobial property - Durability of antimicrobial property) En ligne : https://drive.google.com/file/d/1jgZWx7SPuuAdcuvh4qjmtgEaJ-E_mA7y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19220 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15393	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Minimal bactericidal concentration for a quaternary ammonium compound used in soak liquors / Canan Veyselova in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 4 (07-08/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 4 (07-08/2013) . - p. 166-171 Titre : Minimal bactericidal concentration for a quaternary ammonium compound used in soak liquors Type de document : texte imprimé Auteurs : Canan Veyselova, Auteur ; Meral Birbir, Auteur ; Didem Berber, Auteur Année de publication : 2013 Article en page(s) : p. 166-171 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ammoniums quaternaires Antibactériens Concentration minimale bactéricide Peaux brutes -- Trempe Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The soaking process is an ideal environment for bacterial growth and bacterial activity during this process causes severe damages on hides. The use of an effective bactericidal agent during soaking is very important to prevent the detrimental effect of bacteria on hides. A quaternary ammonium compound (QAC) containing 12.5% didecyl dimethyl ammonium chloride and 12.5% benzyl dimethyl ammonium chloride which is used in soaking liquors in Turkiye was examined for its effect on Bacillus licheniformis, Bacillus pumilus, Staphylococcus intermedius, Pseudomonas luteola, Enterobacter cloacae, Vibrio fluvialis and Enterococcus faecium. Staphylococcus intermedius, Pseudomonas luteola, Enterobacter cloacae and Enterococcus faecium were isolated from soak liquor containing 0.8g/L of the test agent. Bacillus licheniformis, Bacillus pumilus and Vibrio fluvialis were isolated from salt-pack-cured hides. These bacteria were commonly found in isolates from salted hides. Thé effect of the test agent at different concentrations on the bacteria was examined by the Kirby-Bauer disk diffusion method on Mueller Hinton Agar both at 25°C and at 37°C. In addition, the Minimal Bactericidal Concentration of the agent for the bacteria and the mixed population of these bacteria was also determined in Mueller Hinton Broth at 37°C. All concentrations of the agent produced an inhibition zone for all of the test bacteria. Inhibition zone diameter changed according to concentration of agent and the species of bacteria. The agent was found to be more effective at 25°C than at 37°C. 2.97g/L of the agent in Mueller Hinton Broth was found to kill both the bacteria and mixed culture at exposure times of both 8 and 24 hours at 37°C. It was concluded that the agent should be used in higher concentrations in soak liquors to inactivate the bacteria that might cause major damages on hides. Note de contenu : - INTRODUCTION : The range of products employed - Resistance to antibacterials - Categories of agent - Previous study - EXPERIMENTAL PROCEDURES : Test bacteria and agent - Determination of protease activity - Determination of lipase activity - Assessment of the efficiency of the test agent on the test bacteria at different concentrations at 25°C and at 37°C by Kirby-Bauer disc diffusion method - Determination of the Minimal Bactericidal Concentration of the test agent on the test bacteria and their mixed culture at 37°C - Bacteria isolated from soak liquor treated with QAC - Bacteria previously found on salt-pack-cured hides - Proteases and lipases found in this study - Previous studies - Results of present study En ligne : https://drive.google.com/file/d/12n4-3uVqGRrYZLcklkvihC_-s-X855_H/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19221 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15393	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Sheepskin in ulcer prevention : a pressure relieving assessment / Zou Jin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 4 (07-08/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 4 (07-08/2013) . - p. 172-175 Titre : Sheepskin in ulcer prevention : a pressure relieving assessment Type de document : texte imprimé Auteurs : Zou Jin, Auteur ; Tang Qiuyue, Auteur ; Xu Bo, Auteur ; Wuyong Chen, Auteur Année de publication : 2013 Article en page(s) : p. 172-175 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de moutons Escarres de décubitus -- Prévention Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Although the sheepskin has been used in clinical care for ulcer prevention, no assessment has been reported on its effect on pressure relieving. Thereby this study aimed at quantitatively evaluating the effectiveness of sheepskin (SSM) in pressure relief. The pressure distributions of 18 students lying in supine posture on the standard hospital mattress (SHM) with and without the sheepskin mattress were measured by the mFLEX system. Variables of peak pressure (mmHg) (PP), average pressure (AP) and contact area (cm2) (CA) at total, back, sacrum and heel region were provided for comparisons. A paired-T test with a significance level of 0.05 shows that, when the overlay of SSM was used on an SHM, total CA was significantly increased by 19.3% and PP and AP were reduced by 8.8% and 10.8% respectively. A similar reduction rate was also obtained at the sacrum position. Except for the heel area, ail outcomes were proven to be reliable. Overall, sheepskin is an effective ulcer prevention product giving pressure relief. En ligne : https://drive.google.com/file/d/1Ex4ZTFu254RKO2Ui02ROa1lIIArpcnHm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19222 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15393	-	Périodique	Bibliothèque principale	Documentaires	Disponible