Comparative analysis of moisture permeability of natural sheepskin and regenerated leather with temperature and time / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 5 (09-10/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 5 (09-10/2023) . - p. 186-188 Titre : Comparative analysis of moisture permeability of natural sheepskin and regenerated leather with temperature and time Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Chen Xiaoting, Auteur ; Huang Zhuo, Auteur ; Fang Songchun, Auteur Année de publication : 2023 Article en page(s) : p. 186-188 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir reconstitué Cuirs et peaux -- Analyse Cuirs et peaux -- Effets de l'humidité Cuirs et peaux de moutons Microscopie électronique à balayage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This paper mainly compares and analyses the moisture permeability of natural sheepskin and regenerated leather with temperature and time. It was found that the effect of temperature on the moisture permeability of natural sheepskin and regenerated leather was significantly greater than that of time. The performance and trend of moisture permeability of recycled leather under both time and temperature are similar to that of sheepskin as a whole. At a low temperature below 50°C, the moisture permeability of recycled leather is comparable to that of natural sheepskin ; as the temperature rises, its moisture permeability gradually opens up the gap with that of sheepskin. By SEM characterisation, it was found that the fibrous tissues of the natural sheepskin papilla layer were tightly connected and the fibrous tissues of the reticulated layer were loose and disordered ; the recycled leather mainly consisted of crushed fibrous waste and adhesive, and the fibres were stuck with adhesive between them. Note de contenu : - EXPERIMENTAL PROCEDURES : Material preparation - Experimental equipment - Experimental procedure - RESULTS AND DISCUSSION : Comparison of the effects of different times and temperatures on the moisture permeability of natural sheep leather and regenerated leather - SEM microscopic analysis En ligne : https://drive.google.com/file/d/19_K5w4JRk7fENRhV_VkOeN0gSwHJCM8I/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39958 [article]

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Comparative analysis of the mechanical properties of cattle leather in different parts / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 4 (07-08/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 4 (07-08/2023) . - p. 145-147 Titre : Comparative analysis of the mechanical properties of cattle leather in different parts Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Huang Zhuo, Auteur ; Zhou Meng, Auteur ; Chen Xiaoting, Auteur ; Fang Songchun, Auteur Année de publication : 2023 Article en page(s) : p. 145-147 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de bovins Microscopie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Because of its inherent growth, the cattlehide varies from one part to another. The purpose of this study is to test and analyse the mechanical properties of different parts of cattlehide. It was found that : the same piece of cattlehide has a large difference in mechanical properties in the transverse direction and in the longitudinal direction. Fracture strength: neck > butt > belly, elongation at break : butt > belly > neck, tensile strength : butt > neck > belly. Fibre density is positively correlated with the fracture strength. The fibre density of the belly was 53% with poor bundling. The butt had a fibre density of 59%, with good bundling and large pores between fibres. The fibre density of the neck was 65%. There were small pores between fibres with loose fibre weaving, and disordered fibre arrangement. Differences in the structural shape of the fibres in the corium layer resulted in differences in the strength of the components. Note de contenu : - EXPERIMENTAL PROCEDURE : Experimental parameters - Experimental materials and apparatus - RESULTS AND DISCUSSION : Analysis of the stress-strain curves for different parts - Comparison of the mechanical properties of different parts - Characterisation of different parts by microscopy - Microscopic molecular analysis of three parts En ligne : https://drive.google.com/file/d/10XKMt60gISMkg8x5JmekXZjDw_sZgKs-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39688 [article]

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Correlation analysis and microscopic simulation of temperature, time and moisture permeability of natural sheepskin and regenerated leather / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 5 (09-10/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 5 (09-10/2023) . - p. 183-185 Titre : Correlation analysis and microscopic simulation of temperature, time and moisture permeability of natural sheepskin and regenerated leather Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Chen Xiaoting, Auteur ; Huang Zhuo, Auteur ; Fang Songchun, Auteur ; Guo Yizi, Auteur Année de publication : 2023 Article en page(s) : p. 183-185 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir reconstitué Cuirs et peaux -- Effets de l'humidité Cuirs et peaux -- Effets de la température Cuirs et peaux de moutons Perméabilité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, the comprehensive effects of environmental temperature and time on the moisture permeability of natural sheepskin and regenerated leather were compared and analysed by using MATLAB fitting and least square method and their regression equations were constructed respectively. The microstructure comparison shows that both natural and recycled leathers are composed of protein fibres, which have many hydrophilic groups in their chains, therefore both have good moisture permeability which varies significantly with temperature. The moisture permeability of regenerated leather is slightly weaker than that of natural sheepskin leather. The reason is that latex molecules fill between the collagen fibres, which reduces the gaps through which water vapour can pass, while the papillary layer of natural sheepskin has a tight structure and has a wicking effect that regenerated leather does not. Note de contenu : - Correlation analysis between temperature and time of the moisture permeability of natural sheepskin and regenerated leather - Microsimulation En ligne : https://drive.google.com/file/d/1dECUNRpYQHcHuWQNxz85sR9fAtC5hvN5/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39957 [article]

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Establishment and prediction of correlation model between moisture permeability, thickness and temperature of cattle and sheep leather / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 3 (05-06/2022)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 3 (05-06/2022) . - p. 117-119 Titre : Establishment and prediction of correlation model between moisture permeability, thickness and temperature of cattle and sheep leather Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Fang Songchun, Auteur ; Wang Jie, Auteur ; Zhao Jinlong, Auteur Année de publication : 2022 Article en page(s) : p. 117-119 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Effets de l'humidité Cuirs et peaux -- Effets de la température Cuirs et peaux -- Epaisseur Cuirs et peaux de bovins Cuirs et peaux de moutons Modèles mathématiques Perméabilité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This paper mainly studied the relationship between moisture permeability, thickness and temperature of cattle and sheep leather. The arrangement of protein fibres was obtained by scanning electron microscope and the effect of temperature on the moisture permeability of cattle and sheep leather was analysed from the microscopic point of view. The fitting equation of the relationship between moisture permeability of cow and sheep leather and thickness and temperature at one atmospheric pressure was obtained. Cow leather equation: Yl = —0.07556x2 .2099xT + 0.03592T2 + 0.4021x — 2.579T + 60.04 Sheep leather equation: = —0.05995x2-0.1565xT + 0.0316672 + 3.475x — 2.254T + 47.34 The automatic generation curve of temperature, thickness and moisture permeability was established by MATLAB, and the moisture permeability of sheepskin and cowhide under the condition of unknown temperature and thickness can be predicted. Note de contenu : - EXPERIMENTAL PROCEDURES : Experimental instruments - Experimentals materials - RESULTS AND DISCUSSION : Microscopic analysis of the effect of temperature on the moisture permeability of leather - Establishment of mathematical model - Automatic generation of associative curves En ligne : https://drive.google.com/file/d/1bcx4UjoB8izN0cq7iU3fgavruWRzR4XH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37755 [article]

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Mechanical microscopic analysis in the process of stretching cowskin collagen / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 1 (01-02/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 1 (01-02/2023) . - p. 16-18 Titre : Mechanical microscopic analysis in the process of stretching cowskin collagen Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Huang Zhuo, Auteur ; Fang Songchun, Auteur ; Zhou Meng, Auteur Année de publication : 2023 Article en page(s) : p. 16-18 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de bovins Etirement (mécanique) Microscopie Traction (mécanique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The tensile properties of cowskin leather are expressed in terms of its important mechanical properties. Variation in the collagen of cowhide is the microscopic cause of the tensile properties of cowhide. The aim of this study was to perform molecular dynamics simulations for the collagen stretching process of clothing cowhide at the rate of 0.01nm/ps, on lengths of 10nm. The changes in the RMSD (root square mean deviation of atomic position), SASA (solvent accessible surface), potential energy, and hydrogen bonding of collagen throughout the stretching process were obtained. The RMSD of the collagen fluctuated during the stretching process and tended to equilibrate. SASA increased with increasing voltage and reached a critical condition at 900 ps. In the molecular unwinding and uncoiling stage, the potential energy remained constant and it increased rapidly in the stage of stretching backbone. The numbers of hydrogen bonds within the collagen gradually decreased but increased between collagen and the aqueous solvent, with both hydrogen bonds reaching a turning point at 900ps. Note de contenu : - Research theory - Experimental procedures - Results and discussion : RMSD analysis - SASA analysis - Potential energy analysis - Hydrogen bonds analysis En ligne : https://drive.google.com/file/d/1_x0hOgHg-Dpk_o9VVc7w3D9eLZfokaEg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38868 [article]

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Micro analysis of moisture permeability and its changing trend in thin cowhide / Abigail Clare in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 2 (03-04/2022)  

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Microscopic analysis of the tensile properties of cattle collagen / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 6 (11-12/2022)  

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Research and micro analysis of thin sheep leather and its moisture permeability after adding an acrylic coating / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 4 (07-08/2022)

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Study of the fracture strength of waterbornd PU modified cattle leather at different thicknesses / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 4 (07-08/2022)  

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Study on moisture permeability and microscopic analysis of two kinds of coated thin sheep leather / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 5 (09-10/2022)  

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The ecotoxicity of leathers under different tanning methods / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 2 (03-04/2022)  

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