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Three-dimensional spatial distribution analysis of fibre in wet-blue pig leather / Jing Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
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Titre : Three-dimensional spatial distribution analysis of fibre in wet-blue pig leather Type de document : texte imprimé Auteurs : Jing Li, Auteur ; Honglei Teng, Auteur ; Suqing Liu, Auteur ; Jing Xu, Auteur ; Tianduo Li, Auteur Année de publication : 2018 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse
Cuirs et peaux de porcs
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the paper, the ratio of spatial distribution of fibre in wet-blue leather obtained from the spinal region of adult pigskin is researched in both horizontal and vertical directions. Furthermore, the regularity of spatial distribution of fibre is further analysed by the Hurst exponent H. Such spatial structure analyses are essential to obtain true 3D data, including the shape, size and orientation of fibres. We demonstrate that the data sets can be obtained by serial paraffin sections using a series of improved techniques, such as serial-sectioning, SEM imaging and locating techniques. In the study, stacks of several hundred sections 4µm thick have been obtained to evaluate their spatial relationships. We find that the ratio of spatial distribution of fibre is always fluctuation in a narrow range in both horizontal and vertical directions in wet-blue leather. The information studied in the paper will be of central importance in leather structure research for providing a scientific path to analyse intrinsic leather strength and the process of chemical treatment. Note de contenu : - EXPERIMENTAL PROCEDURES : A Sample preparation and serial sections - B. Imaging and locating
- RESULTS AND DISCUSSION : A. Serial-sectioning - B. Imaging - C. Location - D. Quantitative measurements
- Fig. 1 : The high-contrast images obtained using a low-vacuum SEM at a magnificationof (A) 50X, (B) 500X, (C) 1000X and (D). Spot size : 6.3 ; contrast : 90 ; brightness : 10
- Fig. 2 : The light microscopy images obtained from six consecutive slices paraffin-embedded with little deformation by serial-sectioning technique
- Fig. 3 : The curves showed the locating precision throughout a stack of images from the fibre network
- Fig. 4 : The SEM images showing mean area occupied by fibres (black) and by interspaces (white)
- Fig. 5 : he curve shows the ratio of spatial distribution of fibre in vertical direction in wet-blue leather. The magnification of images is 40X
- Fig. 6 : The curve shows the ratio of spatial distribution of fibre in vertical direction in wet-blue leather. The magnification of images is 100X
- Fig. 7 : The curve shows the ratio of spatial distribution of fibre in horizontal direction in wet-blue leather. The magnification of images ranged from 50X to 6000XEn ligne : https://drive.google.com/file/d/1KexZvlIdAv2aSjxJOXNxHdZR_SncUZPF/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30790
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Code-barres Cote Support Localisation Section Disponibilité 20058 - Périodique Bibliothèque principale Documentaires Disponible Short-term hide preservation with acid and salt / Jaume Soler in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
[article]
Titre : Short-term hide preservation with acid and salt Type de document : texte imprimé Auteurs : Jaume Soler, Auteur ; Mercè Saborit, Auteur ; Esther Bartoli, Auteur ; Josep Maria Morera, Auteur Année de publication : 2018 Article en page(s) : p. 118-124 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse
Cuirs et peaux -- Conservation
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
Formique, Acide
Sels de sodium
Sulfurique, AcideIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A hide preservation method based on salt and formic or sulfuric acid has been developed. This method allows 74% salt savings compared to the salt consumption in the conventional salting system. World-avide such savings would involve approximately 3 million tons of salt. This salt is now eliminated as contaminated solid waste or dissolved in residual waters. The change in the preservation system cuts the expenses by at least 48 %. Results show that the new method is effective for short-term preservations (1 month) as leathers of equal or superior quality are obtained. This method may also be used in longer term preservations as long as the elongation and the tensile strength requirements are not a priority in the final article. Note de contenu : - MATERIALS AND METHODS : Materials - Methodology
- RESULTS AND DISCUSSION : Determination of salt content in the pieces of hide preserved with acid and salt - Tests to determine putrefaction depending on the type of preservation - Physical and organoleptic properties of leathers depending on the type preservation - Comparison on the salt employed in each of the preservation systems - economic considerationsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30791
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 3 (05-06/2018) . - p. 118-124[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20058 - Périodique Bibliothèque principale Documentaires Disponible A study of quantifying the emotional quality applied to a materials analysis method for genuine automotive leather / Jeong Chan Ho in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
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Titre : A study of quantifying the emotional quality applied to a materials analysis method for genuine automotive leather Type de document : texte imprimé Auteurs : Jeong Chan Ho, Auteur ; Keumhyang Lee, Auteur ; Minchul Shin, Auteur ; Wonju Kim, Auteur ; Eunchul Shin, Auteur Année de publication : 2018 Article en page(s) : p. 125-129 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse sensorielle
Consommateurs -- Préférences
Cuir dans les automobiles
Cuirs et peaux -- Analyse
Evaluation visuelle
Souplesse (mécanique)
ToucherIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study is concerned with the technique of quantifying and digitizing four kinds of emotions felt by customers with products, utilising the material quality control analysis methods to control leather materials for vehicles. Through the measurement of protein quantity and microscopic observation, this study conducted an authentication of natural leather and the discrimination of the grade of leather ; customers' emotions, sensory characteristics, such as touch sensibility and flexibility were defined through an analysis of the fatiiquoring agent contained in leather. As for visual characteristics, the luxury felt when we look at the leather surface composed of a dense structure was analysed in relation to the pore density of the leather surface, the phenomenon of loose grain or creases was investigated by an analysis of the pores between the fibrous layers of leather and the density. The developed comprehensive analysis technique can enable the development of the optimum material that reflecfs the customer's needs and be widely utilized in improving leather materials through investigating the causes for the problem of quality. Note de contenu : - Table 1 : Protein contents of a variety of leather by elemental analysis
- Table 2 : Leather classification by optical microscope
- Table 3 : Comparison of pore density by microscopy
- Table 4 : Analysis of shape according to wrinkling (by microscopy)
- Table 5 : ATR result of coating material
- Table 6 : Type and content of softener oil (fatliquor)
- Fig. 1 : BET result of bad and good grades
- Fig. 2 : Panel test of surface feelEn ligne : https://drive.google.com/file/d/1X68z6fDqv2XbQwtdztXP5co9mOGfH7id/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30792
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Code-barres Cote Support Localisation Section Disponibilité 20058 - Périodique Bibliothèque principale Documentaires Disponible Examination of catabolic activities of enterobacteriaceae isolated from soaked sheep skins and cattle hides / Eda Yazici in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
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Titre : Examination of catabolic activities of enterobacteriaceae isolated from soaked sheep skins and cattle hides Type de document : texte imprimé Auteurs : Eda Yazici, Auteur ; Meral Birbir, Auteur Année de publication : 2018 Article en page(s) : p. 130-140 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bactéries -- Identification
CatabolismeLe catabolisme est l'ensemble des réactions de dégradations moléculaires de l'organisme considéré. Il est le contraire de l'anabolisme, ensemble des réactions de synthèse. Le catabolisme et l'anabolisme sont les deux composantes du métabolisme.
Les réactions de catabolisme sont des oxydations (ou des déshydrogénations) et elles sont thermodynamiquement favorables, c'est-à -dire qu'elles sont exergoniques (cédant de l'énergie chimique, produisant de l'énergie).
Les réactions du catabolisme des protides, glucides, lipides, acides nucléiques, etc., sont toutes intimement liées. Il s'agit d'un enchaînement de réactions chimiques.
Cuirs et peaux -- Conservation
Cuirs et peaux de bovins
Cuirs et peaux de moutons
EntérobactériacéesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Detailed examination of the members of family Enterobacteriaceae found on soaked sheepskins and cattle hides offers important information about enteric species on the samples, the efficiency of antibacterial agents used in soaking process against these enteric species and their roles in deterioration of skins or hides during soaking process. Hence, the goal of this study was to examine members of the family Enterobacteriaceae on soaked sheepskins and cattle hides treated with antibacterial agent. In this study, bacterial species belonging to the family Enterobacteriaceae on five soaked sheepskins and ten cattle hides were identified using API® 20E test kits and the other biochemical tests. While Citrobacter freundii, Citrobacter koseri, Cronobacter sakazakii, Enterobacter amnigenus, Enterobacter cloacae, Kluyvera intermedia, Morganella morganii, Proteus mirabilis and Providencia rettgeri were isolated from the soaked sheepskins, Citrobacter koseri, Cronobacter sakazakii, Ewingella americana, Kluyvera intermedia, Morganella morganii, Providencia rettgeri, Serratia marcescens, Serratia plymuthica and Serratia rubidae were obtained from the soaked cattle hides. A fairly high percentage of soaked skin and hide samples contained Enterobacteriaceae members which have catabolic activities for deterioration of skins and hides. The presence of the members of Enterobacteriaceae on the soaked skin and hide samples was thought to be related to faecal contamination, the animal itself, environmental sources and inadequate preservation. As a conclusion, efficient antibacterial treatments should be applied in soaking process to kilt Enterobacteriaceae members which may adversely affect leather quality. Note de contenu : - EXPERIMENTAL PROCEDURES : Soaked sheepskin and cattle hide samples - Examination of pH values of the soaked sheepskin and cattle hide samples - Isolation of members of the family enterobacteriaceae from the soaked hide and skin samples and their identification - Oxidase activities of the enteric bacteria - Catalase activities of the enteric bacteria Protease activities of the enteric bacteria - Lipase activities of the enteric bacteria En ligne : https://drive.google.com/file/d/1wcGfsLt1Q4tlCVMjs4ATOYomxtrNZd8F/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30793
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 3 (05-06/2018) . - p. 130-140[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20058 - Périodique Bibliothèque principale Documentaires Disponible Viscosity properties of collagen solutions : influence of pH, salt type and salt concentration / Kai Lei in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
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Titre : Viscosity properties of collagen solutions : influence of pH, salt type and salt concentration Type de document : texte imprimé Auteurs : Kai Lei, Auteur ; Yulong Li, Auteur ; Congde Qiao, Auteur ; Tianduo Li, Auteur Année de publication : 2018 Article en page(s) : p. 137-140 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène
Cuirs et peaux
Lumière -- Diffusion
Mesure
pH
Solutions (chimie)
ViscositéIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this work, the effects of pH, salt type, and salt concentration on the viscosity behaviour of collagen solutions were investigated by a photoelectric viscometer. The results show that the viscosity behaviour as polyelectrolytes or polyampholytes depended on the charge distribution on the polypeptide chains, which can be tuned by the value of pH of the collagen solution. The intrinsic viscosity of collagen in Na2SO4 solution at pH2.0 first decreases and then increases with increasing salt concentration, while a monotonic decrease of the intrinsic viscosity of collagen is observed in NaCl solution. The intrinsic viscosity of collagen in Cr(OH)SO4 solution at pH4.0 is found to be increased first and then decreased with an increase in salt concentration, whereas an opposite trend is observed in same solution at pH2.0. We suggest that the complicated viscosity behaviour of collagen solution is attributed to the comprehensive effects of shielding, overcharging and crosslinking caused by the introduction of the different counterions. In addition, the viscosity result is also confirmed by dynamic light scattering (DLS) experiment. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Viscosity measurements - Measurement of dynamic light scattering (DLS)
- RESULTS AND DISCUSSION : Effect of counterion valency on the intrinsic viscosity of collagen in salt solutions - Effect of pH on the intrinsic viscosity of collagen in Cr(OH)SO4 solutions - Effect of pH on the average hydrodynamic radius (Rh) of collagen in Cr(OH)SO4 solutionsEn ligne : https://drive.google.com/file/d/1mHRj_sabaPR_JWSuEA8KzjGUOKEDncMx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30794
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Code-barres Cote Support Localisation Section Disponibilité 20058 - Périodique Bibliothèque principale Documentaires Disponible The hydrolytic activities of two fungal species isolated from historical quranic parchment manuscript / Saada N. S. in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
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Titre : The hydrolytic activities of two fungal species isolated from historical quranic parchment manuscript Type de document : texte imprimé Auteurs : Saada N. S., Auteur ; Gomaa Abdel-Maksoud, Auteur ; Ahmed M. Youssef, Auteur ; Mohamed S. Abdel-Aziz, Auteur Année de publication : 2018 Article en page(s) : p. 141-148 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antiquités (objets anciens) -- Analyse
Champignons microscopiques
Hydrolyse
ParcheminIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Two fungal strains were isolated from a historical parchment manuscript found in Al-Azhar library, Egypt and were identified using the molecular technique 18S rRNA. New parchment samples (see 2.1) were placed on the surface of agar plates and inoculated with the two identified fungi and incubated at 30°C for 10, 20 and 30 days. The parchment samples were checked for degradation by measuring its mechanical properties (elongation and tensile strength), and ATR-FTIR analysis to identify structural changes induced in the collagen triple helix. SEM analysis was also carried out to investigate the change of surface morphology of bio-deteriorated collagen fibres. The colour changes in the fungal-treated parchment samples were also examined in order to determine the proteolytic activity caused by the tested fungal strains and their impact on the parchment properties. The results obtained revealed that Aspergillus fumigatus and Talaromyces spectabilis denature collagen as a result of their proteolytic activity, leading to loss of mechanical properties and the fibre network, so the parchment becomes brittle and discoloured. Note de contenu : - MATERIALS AND METHODS : New parchment samples - Sampling and fungal isolation
- Identification of the fungal strains (N1 and N2) - Identification of fungal cultures - Fungal degradation of the parchment samples - Mechanical properties - Fourier transform infrared spectroscopy (FTIR) - SEM examination - Colour change
- RESULTS AND DISCUSSION : Molecular identification of the fungal isolate N1 and N2 - mechanical properties - Fourier Transform Infrared Spectroscopy (FTIR) - Investigation of the surface morphology by SEM - Change of colourEn ligne : https://drive.google.com/file/d/1MAObPBVQX1iS6sYrheyyQwNsmY50T6Kx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30795
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Code-barres Cote Support Localisation Section Disponibilité 20058 - Périodique Bibliothèque principale Documentaires Disponible Effect of histological feature of leather on acrylic resin retanning / Ying Song in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
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Titre : Effect of histological feature of leather on acrylic resin retanning Type de document : texte imprimé Auteurs : Ying Song, Auteur ; Yunhang Zeng, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 149-154 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique
Cuirs et peaux de bovins
Cuirs et peaux de moutons
Cuirs et peaux de porcs
Peau -- Histologie
RetannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The effect of histological features of leather on acrylic resin retanning was investigated by retanning pigskin, cattle hide and sheepskin leathers with fluorescein-labelled poly(acrylic acid) (PAA). A deeper penetration and a higher uptake rate of PAA were observed in the belly area of pigskin leather compared to in its butt area. This led to a greater increase in leather thickness of the belly. As for cattle hide and sheepskin leathers whose structural difference in various parts is not obvious, the differences in penetration and uptake of PAA and increase in leather thickness between their butts and their bellies were relatively slight. These results indicated that acrylic resins penetrate and fill the thinner and looser parts of the leather more easily. This fact gives acrylic resins a good selective filling property and is helpful to level out the structure of leather. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation and analyses of AF-labelled PAA (AF-PAA) - Observation of penetration and distribution of AF-PAA in leather - Determination of uptake rate of PAA in leather - Determination of increase in leather thickness
- RESULTS AND DISCUSSION : Effect of histological features of leather on penetration and distribution of acrylic resin in leather - Effect of histological features on leather on uptake of PAA in leather - Effect of histological features of leather on increase in thickness of leatherEn ligne : https://drive.google.com/file/d/1x84FMU9IsuftPQIMVIWNwd3yh7JcqZCZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30796
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Code-barres Cote Support Localisation Section Disponibilité 20058 - Périodique Bibliothèque principale Documentaires Disponible Effect of novel synthetic clay on the property of waterborne polyurethane leather finishing agent: enhanced thermal, mechanical and UV-resistant performance / Wang Chunhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
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Titre : Effect of novel synthetic clay on the property of waterborne polyurethane leather finishing agent: enhanced thermal, mechanical and UV-resistant performance Type de document : texte imprimé Auteurs : Wang Chunhua, Auteur ; Mu Changdao, Auteur ; Lin Wei, Auteur Année de publication : 2018 Article en page(s) : p. 155-159 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Cuirs et peaux -- Finition
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés thermiques
Laponite
Polymères en émulsion
Polyuréthanes
Résistance au rayonnement ultravioletIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Waterborne polyurethane/laponite composites used for leather finishing have been prepared via the solution mixing method. The dispersion stability of laponite and composite emulsions were determined by atomic force microscopy (AFM) and dynamic light scattering (DLS). Thermogravimetric analysis (TGA), tensile testing and UV-Vis spectra were used to test the performance of the resulting films. The results indicate that the nano-particles with negative charges can form highly stable aqueous dispersion under alkaline condition and exhibit good compatibility with anionic waterborne polyurethanes. The emulsions possess good storage stability with an average particle diameter of 80-94nm. The uniformly dispersed clay platelets can markedly improve the thermal stability and mechanical properties of the composites. In addition, the incorporation of small-sized clay is capable of maintaining the transparent appearance of the film and giving an UV-resistant property. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of polyurethane/laponite (LPU) emulsions and films - Characterisation of laponite, WPU and LPU
- RESULTS AND DISCUSSION : Dispersion stability of laponite - Stability of polyurethane emulsions - Thermal stability - Mechanical property measurement - UV-Vis spectra analysisEn ligne : https://drive.google.com/file/d/1qbu9GWV-X22_dw3rlg9nh36Ku5k4rKOM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30797
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