An air permeability model for leathers / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 3 (05-06/2006)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 3 (05-06/2006) . - p. 108-111 Titre : An air permeability model for leathers Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Fang Wang, Auteur ; Jie Liu, Auteur ; Jinglong Liu, Auteur ; Wang Quanjie, Auteur Année de publication : 2006 Article en page(s) : p. 108-111 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Air Cuir Cuirs et peaux -- Analyse Modèles techniques Perméabilité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : We have constructed a model of air permeability taking into account appropriate parameters. Two of the parameters which represent the capillary radius and the amount of capillaries in a definite area of leather, respectively r and n have been deduced. Researches on the locational differences in air permeability based on the model, show that different locations of leather have different values for r and n. The capillary radius of samples near the head location ranges from 452.9nm to 479.1nm, while the quantity of capillaries in the same sample is the greatest, from 7.948 x 1011/m2 to 8.617 x 1011/m2. The capillary radius (r) of a sample from a near centre location is the largest at 581.0nm and the capillary amount (n) is the lowest at only 5.262 x 1011/m2. The capillary radii of samples near the tail and centre of the leather are about 530nm. Neither the thickness nor aperture ratio can successfully represent the air permeability of leathers. The air permeability process is rather complex. Using only the capillary radius (r) or the quantity of capillaries in a definite area (n) does not allow us to express the air permeability adequately. Note de contenu : - Foundation of the air permeability model and the deduction of parameters - Experimental procedure - Materials and apparatus - Procedures - Table 1 : Original data and parameters r and n En ligne : https://drive.google.com/file/d/1HjUKWAETMsGqiIcbYipmlDvDSEoWHkjd/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39142 [article]

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Influence of sweat on hide and leather / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 1 (01-02/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 1 (01-02/2007) . - p. 30-35 Titre : Influence of sweat on hide and leather Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Fang Wang, Auteur ; Jinglong Liu, Auteur ; Wang Quanjie, Auteur Année de publication : 2007 Article en page(s) : p. 30-35 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Effets de la transpiration Cuirs et peaux de bovins Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Various samples, including untanned, chrome tanned, glutaraldehyde tanned and formaldehyde tanned cattlehide collagen fibres, were prepared and treated in artificial perspiration. Preliminary studies on their dry heat shrinkage and thermal degradation behaviours were completed followed by study of changes in thermal behaviours due to the perspiration exposure. The mechanism of these changes is discussed. The influence of perspiration on the water vapour permeability and the hydrothermal stability of the crust leathers are also discussed. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and Apparatus - PROCEDURES : Treatment of the cattlehide collagen fibres samples in perspiration - Treatment of crust leather in perspiration - RESULTS AND DISCUSSION : Influence of perspiration and tanning agents on the dry heat resistance of samples - Influence of perspiration soaking on the thermal degradation activation energy of different samples - Influence of perspiration on the water vapour permeability of samples - Influence of perspiration soaking on the chrome content in samples - Influence of perspiration on the hydrothermal shrinkage temperature of samples - Table 1 : Components of perspiration solution - Table 2 : Thermal degradation activation energy of samples before and after being perspiration soaked for 15 days En ligne : https://drive.google.com/file/d/1r9-t-IoWIKq1611LwwfOu159yXo7jmfq/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39045 [article]

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Influence of sweat-soaking on the thermal stability of retanned and fatliquored cattlehide collagen fibers / Pengxiang Jia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 7 (07/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 7 (07/2007) . - p. 227-233 Titre : Influence of sweat-soaking on the thermal stability of retanned and fatliquored cattlehide collagen fibers Type de document : texte imprimé Auteurs : Pengxiang Jia, Auteur ; Keyong Tang, Auteur ; Jinglong Liu, Auteur ; Xuejing Zheng, Auteur Année de publication : 2007 Article en page(s) : p. 227-233 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanned cattlehide collagen fibers were retanned and fatliquored by different chemicals. The samples were immersed in artificial sweat for 3 to 15 days. The sweat-soaked collagen fibers were then heated in air. The shrinkage temperature (Ts) and shrinkage ratio were recorded to characterize the thermal stability of the collagen fiber samples. It was found that the shrinkage ratio decreased after the processes of retanning and fatliquoring. After sweat-soaking treatment, the shrinkage temperature of the retanned and fatliquored collagen fibers was decreased and shrinkage ratio was increased, indicating an impaired thermal stability. The Ts decreased with the increase of the sweat soaking time. The chrome retanning liquor and GTA retanned collagen fibers exhibit slow decrease of shrinkage temperature with the increase of sweat-soaking time, showing great resistance to sweat. Compared with that fatliquored by other fatliquoring agents studied, collagen fibers fatliquored by neats- foot oil has better sweat-resistant property. En ligne : https://drive.google.com/file/d/1XJKs4BWu6JiNfPotO7hXC_f4TOjfmrRg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3350 [article]

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Preliminary studies on the thermal degradation kinetics of cattlehide collagen fibers / K. Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 10 (10/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 10 (10/2004) . - p. 401-408 Titre : Preliminary studies on the thermal degradation kinetics of cattlehide collagen fibers Type de document : texte imprimé Auteurs : K. Tang, Auteur ; Jinglong Liu, Auteur ; Jie Liu, Auteur ; F. Wang, Auteur Année de publication : 2004 Article en page(s) : p. 401-408 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, samples of un-tanned cattlehide collagen fibers, chrome tanned cattlehide collagen fibers, and glutaraldehyde tanned cattlehide collagen fibers are prepared and preliminary studies of their thermal degradation behavior completed. The methods of both Flynn-Wall-Ozawa and SatavaÅ esták, which have been being widely and successfully used in the study of thermal degradation kinetics of synthetic polymers, are used to process the data obtained from thermo-gravimetric analysis of the three samples at different heating rates. The results obtained indicate that the thermal degradation activation energy of un-tanned cattlehide collagen fibers is 130-160 kJ/mol. After tanning with chrome, it can reach 225-255 kJ/mol. However, in the case of a sample tanned with glutaraldehyde, its thermal degradation activation energy is only 120-163 kJ/mol, very close to the value of un-tanned cattlehide collagen fibers. The results suggest that the crosslink bonds between collagen molecules formed in the chrome tanning process are much more stable at high temperature than those formed in the glutaraldehyde tanning process. En ligne : https://drive.google.com/file/d/1hJZlVrBVTouywbe7a81hwME6IyYjqi6C/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4222 [article]

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