Analysis of moisture permeability of sheepskin in different parts based on microscopic and water contact angle / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 3 (05-06/2024)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 3 (05-06/2024) . - p. 138-141 Titre : Analysis of moisture permeability of sheepskin in different parts based on microscopic and water contact angle Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Chen Xiaoting, Auteur ; Huang Zhuo, Auteur ; Hu Jingxian, Auteur ; Bian Jing, Auteur ; Liu Shaopu, Auteur Année de publication : 2024 Article en page(s) : p. 138-141 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Cuirs et peaux -- Analyse Cuirs et peaux de moutons Humidité Perméabilité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This paper mainly analyzes the moisture permeability of different parts of sheepskin based on microscopic and water contact angle. Firstly, the moisture permeability of the neck, belly, back and hip of natural sheepskin was tested and the change rule of moisture permeability was analyzed. Then the SEM electron microscope pictures and water contact angle data were obtained. Through the analysis of the fibre distribution, the tight arrangement of fibres and the tension of leather surface in different parts of natural sheepskin, the reasons for the formation of this moisture permeability rule were explained. The study found that under the same temperature and humidity conditions, the moisture permeability of sheep skin in different parts is different. On the whole, the moisture permeability of different parts of sheep skin showed the order of belly > hip > back > neck. Microstructure analysis showed that the order of fibre tightness in different parts was neck > back > hip > belly. The natural sheepskin fibres in the belly and hip are loosely arranged, and their water contact angles are also small, which facilitates the passage of water vapour, so they have excellent performance in moisture permeability; the fibres on the back and neck of natural sheepskin are closely arranged, with less voids, and the water contact angle of the skin is also large, which affects the passage of water vapour. Therefore, the performance of moisture permeability is not as good as that of the belly and hip. Note de contenu : - EXPERIMENTAL METHODS : Material preparation - Experiment equipment - Theory - RESULTS AND DISCUSSION : Analysis of moisture permeability of sheepskin in different parts - Microscopic analysis - Water contact angle analysis Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41139 [article]

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Analysis of the influence of quality parameters on the moisture permeability of natural sheepskin / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 2 (03-04/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 2 (03-04/2024) . - p. 86-89 Titre : Analysis of the influence of quality parameters on the moisture permeability of natural sheepskin Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Chen Xiaoting, Auteur ; Huang Zhuo, Auteur ; Guo Yizhi, Auteur ; Bian Jing, Auteur ; Liu Shaopu, Auteur Année de publication : 2024 Article en page(s) : p. 86-89 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse relationnelle grise Cuirs et peaux -- Analyse Cuirs et peaux de moutons Humidité Perméabilité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Based on the grey system theory, this paper analyzes the comprehensive influence of the quality parameters of sheep leather on the moisture permeability of different parts of sheep leather. The differences in specific surface area and average pore size of sheepskin in different parts were analyzed, and the grey correlation analysis between the three influencing parameters and the moisture permeability of sheepskin in different parts was carried out. The study found that the specific surface area and average pore size of sheep skin in different parts were different. The specific surface area of sheep skin in different parts was ranked as follows: belly > back > neck > hip, and the average pore size was ranked as follows: neck > back > belly > hip. Through the comprehensive analysis of grey correlation, it is found that the order of influence of quality parameters on the moisture permeability of natural sheepskin is: average pore size > thickness > specific surface area. Note de contenu : - EXPERIMENTAL DETAILS : Experimental equipment - Experimental material - RESEARCH THEORY : Specific surface area - Average pore size - Grey system theory - RESULT AND DISCUSSION : Analysis of the influence parameters of different parts - Analysis of the influence of quality parameters on the moisture permeability of natural sheep leather - Fig. 1 : Flow chart of grey model - Table 1 : Natural sheepskin in different parts - Table 2 : Data used in grey correlation analysis En ligne : https://drive.google.com/file/d/1Ih6okLhfAxI1EHNR0fWXtc8SRsH4pSRG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40935 [article]

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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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