Comparative study of moisture permeability of three natural leathers / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 6 (11-12/2020)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 6 (11-12/2020) . - p. 271-274 Titre : Comparative study of moisture permeability of three natural leathers Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Wang Jie, Auteur ; Ling Yali, Auteur Année de publication : 2020 Article en page(s) : p. 271-274 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux de bovins Cuirs et peaux de moutons Cuirs et peaux de porcs Humidité Perméabilité Température Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Pigskin, cowhide and sheepskin are commonly used clothing materials in our life. The study of moisture permeability is very important. In this paper, the effects of temperature and humidity on the moisture permeability of three kinds of leather were studied. The results showed that the moisture permeability of the three kinds of leather increased with the increase of temperature, and the rising trends of pigskin and sheepskin were similar. When the temperature was greater than 20°C, their order of moisture permeability was cowhide > pigskin > sheepskin. With the increase of humidity, the moisture permeabilities of the three kinds of leather were close to each other, the changing trend of moisture permeability of pigskin and sheepskin was very similar. The moisture permeability of sheepskin is greatest at high humidity. By comparing the 3d surface and the mathematical model, it was found that humidity has a greater influence on its moisture permeability than temperature. Note de contenu : Pigskin, cowhide and sheepskin are commonly used clothing materials in our life. The study of moisture permeability is very important. In this paper, the effects of temperature and humidity on the moisture permeability of three kinds of leather were studied. The results showed that the moisture permeability of the three kinds of leather increased with the increase of temperature, and the rising trends of pigskin and sheepskin were similar. When the temperature was greater than 20°C, their order of moisture permeability was cowhide > pigskin > sheepskin. With the increase of humidity, the moisture permeabilities of the three kinds of leather were close to each other, the changing trend of moisture permeability of pigskin and sheepskin was very similar. The moisture permeability of sheepskin is greatest at high humidity. By comparing the 3d surface and the mathematical model, it was found that humidity has a greater influence on its moisture permeability than temperature. En ligne : https://drive.google.com/file/d/1qqfYYxLyy-dux_NUF9qJTPa22QcR-v42/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34903 [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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A novel approach for wet-white leather manufacture based on tannic acid-laponite nanoclay combination tannage / Jiabo Shi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 1 (01-02/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 1 (01-02/2016) . - p. 25-30 Titre : A novel approach for wet-white leather manufacture based on tannic acid-laponite nanoclay combination tannage Type de document : texte imprimé Auteurs : Jiabo Shi, Auteur ; Ren Keshuai, Auteur ; Wang Chunhua, Auteur ; Wang Jie, Auteur ; Lin Wei, Auteur Année de publication : 2016 Article en page(s) : p. 25-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Laponite Nanoparticules Tanins Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Wet-white (tannage) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A novel wet-white tanning approach based on combination tanning with tannic acid (TA) and Laponite nanoclay has been proposed. Thermal stability measurements show that the introduction of Laponite nanoclay gives an obvious increase in the shrinkage temperature (Ta) cf TA-tanned leather, implying the presence of the synergistic effect between TA and Laponite nanoclay in the combination tanning process. The optimized tanning system, i.e. 20% TA combination tanned with 3% Laponite in one-bath for 3 hours al 25°C and final pH '-3.5, confers wet-white leathers with Ta above 89°C, and good storage stability. The introduction of Laponite nanoclay facilitates the fixation of TA in the wet-white leather. Scanning electron microscopie (SEM) results show that the combination tanned leathers exhibit fine isolated collagen fibre networks in cornparison with that of solo TA and solo Laponite tanned leather. The presence of Laponite nanoclay not only improves the mechanical strength of the resulting leather, but also gives an ultraviolet protection property. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Solo TA or laponite tanning process - TA-laponite combination tanning process - Determination of shrinkage temperature - Determination of the uptake of TA - Scanning electron microscopic analysis of crust leathers - Physical properties examination - Anti-UV property measurements - RESULTS AND DISCUSSION : Optimization of solo TA tannage - Optimization of TA-laponite nanoclay combination tannage - Scanning electron microscopic analysis of crust leathers - Physical strength properties of leathers - Anti-ultraviolet property of leathers En ligne : https://drive.google.com/file/d/16MrKQSI3ImRz-Y0Mh4TMm9XBm4IHqnyA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25558 [article]

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Relevant research on moisture permeability of sheepskin and its polyurethane coated version with temperature and time / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 4 (07-08/2021)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 4 (07-08/2021) . - p. 190-192 Titre : Relevant research on moisture permeability of sheepskin and its polyurethane coated version with temperature and time Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Wang Jie, Auteur Année de publication : 2021 Article en page(s) : p. 190-192 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux de moutons Essais (technologie) Humidité Perméabilité Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Natural leather has good moisture permeability, while polyurethane film has good elasticity and water resistance. In order to study the change trend of moisture permeability of natural leather and polyurethane-coated natural leather, this paper tested the moisture permeability of sheepskin and polyurethane-coated sheepskin under different time and temperature conditions. The results showed that the moisture permeability of sheepskin and PU-coated sheepskin increased with the increase of temperature. The moisture permeability of the two leather was: sheepskin>PU-coated sheepskin. Note de contenu : - EXPERIMENTAL PROCEDURES : Experimental materials and instruments - Moisture permeability test - RESULTS AND DISCUSSION : Analysis of micro characteristics - Analysis of moisture permeability - Comparative analysis of 3D surface model En ligne : https://drive.google.com/file/d/1oZi1W_3KBywXT1PZaO7d6QlMZ4DGqZuZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36108 [article]

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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)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 4 (07-08/2022) . - p. 162-164 Titre : Study of the fracture strength of waterbornd PU modified cattle leather at different thicknesses Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Huang Zhuo, Auteur ; Fang Songchun, Auteur ; Wang Jie, Auteur Année de publication : 2022 Article en page(s) : p. 162-164 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de bovins Dioxyde de silicium Essais de résilience Essais dynamiques Matériaux -- Epaisseur Polyuréthanes Résistance à la rupture Revêtements en phase aqueuse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The fracture strength of thin leather is an important indicator of the longevity of leather for apparel. The same cattle leather was cut into 6 thicknesses and waterborne PU (WPU) modified with 4 mass fractions of Si02 was then applied on the leather for tensile comparison. The results showed that the fracture strength of cattle leather differed significantly between the transverse and longitudinal directions. The fracture strength of the cattle leather was greater in the transverse direction than in the longitudinal when the thickness was less than 0.65mm, the longitudinal fracture strength is greater the transverse strength when the thickness is between 0.65mm and 0.8mm,and the transverse strength was greater than the longitudinal strength is thicker than 0.8mm. The effect of the different mass fractions of Si02 modified WPU coating on the fracture strength did not show any significant difference. The regression equation of the effect of thickness and mass fraction of Si02 in modified WPU on the fracture strength of cattle leather was established based on the principle of least squares and surface plots were made. It was found that thickness had a greater influence on the fracture strength of cattle leather than coating modification. Note de contenu : - RESEARCH THEORY - EXPERIMENTAL PROCEDURES : Experimental apparatus - Experimental materials - RESULTS AND DISCUSSION : Comparative analysis of cattle leather cross sections - Effect of thickness on the strength of different cattle leather - The comprehensive effect of thickness and WPU mass fraction on the fracture strength of cattle leather En ligne : https://drive.google.com/file/d/1iccgLr86B8tmHoQjN94VGlIOpD_G_mH8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37880 [article]

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