Anomalies of pigskin structure / R. Monastyrska-Przybylak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 66 (Année 1982) . - p. 74-78 Titre : Anomalies of pigskin structure : Part III. Analysis of leather structure through fatigue and density tests Type de document : texte imprimé Auteurs : R. Monastyrska-Przybylak, Auteur Année de publication : 1982 Article en page(s) : p. 74-78 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Structure Cuirs et peaux -- Analyse Cuirs et peaux -- Défauts Cuirs et peaux de porcs Densité cutanée Essais de résilience Essais dynamiques Matériaux -- Fatigue Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this part of the paper we try to define the influence of leather compactness in four topographic areas tested in an electron scanning microscope, namely, neck, croupon, butt and belly, on a behaviour of pigskin leather under wear conditions. Fatigue tests in the range 0-20 % extensions and apparent density tests were performed. Total compactness of the structure was defined for tested topographic areas by means of loosening ability. It was found that the butt, commonly considered to be the most compact region of pigskin, shows the highest ability to loosening (apart from belly parts) under wear conditions. Lesser ability to loosening shows neck area and the least, croupon area. The results of apparent density tests confirmed the compactness of structure defined by fatigue tests in several topographic locations. Note de contenu : - Table 1 : Elasticity modulus values at 20 % extension before and after fatigue tests for fatliquored and non-fatliquored pigskin leathers - Table 2 : Student's "t" values for differences before and after fatigue (critical values with 5 % error risk in parentheses), fatliquored leathers - Table 3 : The area of field under hysteresis loop before and after fatigue tests - Table 4 : Apparent Mass in g/cm3 En ligne : https://drive.google.com/file/d/1EmIPBtjvEeZengkEvU8rwXSR79Rp9iZe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34213 [article]

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Characterization 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)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 23-29 Titre : Characterization of goat leather structure using a metallographic technique Type de document : texte imprimé Auteurs : Huayong Zhang, Auteur ; Lu Hongwang, Auteur ; Zan Yongli, Auteur ; Yongmei Xia, Auteur ; Tianduo Li, Auteur Année de publication : 2015 Article en page(s) : p. 23-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Cuir -- Structure Cuirs et peaux -- Analyse Cuirs et peaux de chèvres Microscopie électronique à balayage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A series of cross sections of the goal bluestock using a metallographic technique were first examined with a scanning electron microscopy (SEM) in the back-scattered electrons (BSE) mode and an optical microscope with oblique illumination. Through analyzing and comparing the images obtained in different modes, the different patterns of leather structure were illustrated in detail. The advantages and disadvantages of various examination methods were explained. Note de contenu : - Characteristic of the SEM images of leather samples via metallographic sample preparation - Comparison of the images obtained by SEM and optical microscope - Comparison of the images obtained by optical microscope with vertical illumination and oblique illumination En ligne : https://drive.google.com/file/d/1SHT5App3a5WbHZm-K_JXDxk6jgbVP-0L/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23230 [article]

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Micro-computed tomography studies for three-dimensional leather structure analysis / E. Bittrich in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 11 (11/2014)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 11 (11/2014) . - p. 367-371 Titre : Micro-computed tomography studies for three-dimensional leather structure analysis Type de document : texte imprimé Auteurs : E. Bittrich, Auteur ; K. Schladitz, Auteur ; Renate Meyndt, Auteur ; H. Schulz, Auteur ; M. Godehardt, Auteur Année de publication : 2014 Article en page(s) : p. 367-371 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Structure Cuirs et peaux -- Analyse Tomographie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The use of micro-computed tomography for the elucidation of tree-dimensional microstructure of leather is described. Layers of leather, fiber bundles with their branches and inner structure are detectable. For the fine-fibered and dense-structured grain layer techniques with higher resolution are required, such as SEM. Problems encountered in image analysis with respect to automated segmentation are discussed and alternative solutions are presented. Note de contenu : - Analysis of the system of collagen fiber bundles - Analysis of individual fiber bundles En ligne : https://drive.google.com/file/d/1xSSPhxhKYhRXVVMctp0wLh5OGzW8o6nF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22277 [article]

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The relationship between the organoleptic properties of leather and the aggregate structure of collagen fibres / Ren Bianli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 6 (11-12/2018)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 6 (11-12/2018) . - p. 289-292 Titre : The relationship between the organoleptic properties of leather and the aggregate structure of collagen fibres Type de document : texte imprimé Auteurs : Ren Bianli, Auteur ; F. Qi, Auteur ; Chai Yuye, Auteur ; Lan Yunjun, Auteur ; Zou Xianglong, Auteur Année de publication : 2018 Article en page(s) : p. 289-292 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène Cuir -- Structure Cuirs et peaux -- Finition Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux de moutons Distribution et orientation des fibres Retannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sample of chromed sheep leather were prepared to establish the relationship between the organoleptic properties of leather and its structure after being retanned and oiled. The organoleptic properties and structure of them were characterized by stress-stain analysis, SEM and organoleptic test. The relationship was investigated from the point of fibre mobility. The results show that, when fibre bundles become thin and porosity increases, fibre mobility increases, as does softness, but tightness weakens. With the extent of fibre orientation decreasing, thicknessincreases, and smoothness decreases. Fullness is a special parameter related of leather thickness and fibre mobility. As collagen fibres have better motion capability when there is a decrease in the degree of orientation, fullness improves. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - SEM observation - Extent of orientation of the collagen fibres - Organoleptic test - RESULTS AND DISCUSSION : Effects of AR on the leather's organoleptic properties - Effects of AR on collagen fibres' aggregate structure - Analysis of the relationship between the organoleptic properties and the collagen fibres' aggregate structure En ligne : https://drive.google.com/file/d/1fPHIhuT41jQwtelgmcgLpJ7L_V3uWDW_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31322 [article]

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The structural and chemical properties of the nile perch fish leather / Peter Maina Wairimu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 8 (08/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 8 (08/2020) . - p. 288-293 Titre : The structural and chemical properties of the nile perch fish leather Type de document : texte imprimé Auteurs : Peter Maina Wairimu, Auteur ; Esther W. Nthiga, Auteur ; Moses A. Ollengo, Auteur Année de publication : 2020 Article en page(s) : p. 288-293 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Structure Cuir -- teneur en chrome Cuirs et peaux -- Propriétés chimiques Cuirs et peaux -- Teneur en humidité Cuirs et peaux de Poissons Perche du Nil Tannage au chrome Température de retrait Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The conversion of skin to leather involves structural, chemical and physical changes to the material. The changes to the material is often after every subsequent process that the skin goes through before getting to the final leather. The leather processing involves three sub stages; pretanning, tanning and post tanning. The aim of the study was to determine the structural and chemical properties of chrome tanned Nile perch fish leather. The structural properties were determined using scanning electron microscope (SEM). The materials were analyzed for both the surface and cross section. The structural properties were carried out on the raw material then the material was subjected to tanning and there after the structural properties were determined in order to note the change that the tanning has on the structural properties of this particular material. Chrome content was analyzed using atomic absorption spectrometer (AAS) and amount was reported in percentage content. The moisture content was quantified and reported in percentage value. From the structural analysis it was noted that the raw material is less compacted as compared to the chrome tanned leather. The fibers of the materials runs in one direction. The speed of the drum needs to be regulated to reduce the destruction of the collagen fibers which largely affects the physical properties of the leather. The average values of chemical properties were reported as follows: Chrome content of 2.45 % and Moisture content of 13.33 ± 1.88 % .The chrome content that was offered in the leather was satisfactory to give it a good hydrothermal stability. Note de contenu : - MATERIALS AND METHODS : Raw material - Tanning process - Structural analysis of the leather - Chrome content determination - Determination of shrinkage temperature - Moisture content determination - RESULTS AND DISCUSSION : Chrome content - Moisture content DOI : https://doi.org/10.34314/jalca.v115i8.3845 En ligne : https://drive.google.com/file/d/1wBCcyBARHrqzvrjNUygHoiaXmaD_mN4v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34435 [article]

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