Assessment of the thermal resistance of leather / Anna Matz in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 68 (Année 1984)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 68 (Année 1984) . - p. 1-7 Titre : Assessment of the thermal resistance of leather Type de document : texte imprimé Auteurs : Anna Matz ; Czeslaw Krawiecki, Auteur ; Miroslaw Mrozowski, Auteur Année de publication : 1984 Article en page(s) : p. 1-7 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Contraintes thermiques Cuirs et peaux -- Propriétés thermiques Evaluation Résistance thermique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A great deal of attention has been paid recently to leathers designed for production of protective clothing worn under "hot" conditions. Several tanning technologies and methods for assessing leather properties have been developed. Relatively few papers have appeared which discussed the phenomena occurring in leather under the influence of heat in an air-dry medium. The practical measure of the leather thermal resistance, which cannot be overlooked in its assessment, is the temperature at which the visible deformation of leather occurs. Depending on conditions in which the leather remains while heated, we may differentiate between (a) the autonomous deformation occurring under the influence of leather-free shrinkage and (b) the deformation under the influence of stresses in leather. The first case of deformation occurs in leathers of small area used in a loose state. Macromolecules, under the influence of heating in such samples, are subjected only to small internal stresses. When affected by a given thermal energy they may increase their entropy and assume the most thermodynamically advantageous shape at a given degree of their crossilinkage. On a macroscale this appears as a certain shrinkage of material. In the case of leathers of greater area or of those used for products with more rigid construction, e.g. footwear, the shrinkage proceeds under slightly different conditions. On a macroscale, the shrinkage does not occur freely as a result of immobilisation of leather edges. On a microscale, the macromolecules have a limited possibil¬ity of changing their shape for they are interconnected by cross-linking. Considering this fact, there tends to be a maximum entanglement of chains, under given conditions, the stresses within the leather being higher the greater the number of macromolecules orientated towards the tested direction which participate in this phenomenon. An outer stress applied to the specimen influences the shrinkage rate and the temperature at which intensive shrinkage begins. The effect of temperature on leathers, under isometric conditions, is a limiting example of the shrinkage to stress ratio. The purpose of our work was to evaluate the thermal resistance of leathers heated in an air-dry medium. The behaviour of leathers heated under free and isometric conditions has been investigated. Note de contenu : - Conditions of test - Examination of thermal resistance of leathers deformed under free conditions - examination of the thermal resistance of leathers undergoing deformation in a stressed state - Cyclic heating cooling of specimens - Changes in leather subjected to constant temperature En ligne : https://drive.google.com/file/d/1xc3X6iSqmmDPSKw6kXXdfr6G8kuHGcbu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34141 [article]

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Water sorption capacity of tanned collagen fibres / K. J. Bienkiewicz in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 61 et 62 (Années 1977 et 1978) . - p. 34-41 Titre : Water sorption capacity of tanned collagen fibres Type de document : texte imprimé Auteurs : K. J. Bienkiewicz, Auteur ; Czeslaw Krawiecki, Auteur Année de publication : 1978 Article en page(s) : p. 34-41 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption Adsorption Alumine Chrome Collagène Cuirs et peaux Eau Glutaraldéhyde 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 Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Water sorption capacity of tanned, spun collagen fibres has been examined and compared with that of standard, tanned and acylated hide powders. Chromium, chromium-alumina, glutaraldehyde and combined tannages have been applied. In spite of that the applied tannages engage different functional groups-only small differences in water sorption capacity have been observed-these do not exceed 20% of total value. Note de contenu : - Tables : Sorption capacity of collagen fibres En ligne : https://drive.google.com/file/d/1iETJn5Ph3AIRJoChQimXKDLa3w_C25a3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31846 [article]

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Water sorption capacity of tanned collagen fibres / K. J. Bienkiewicz in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61, N° 2 (03-04/1977)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 61, N° 2 (03-04/1977) . - p. 34-41 Titre : Water sorption capacity of tanned collagen fibres Type de document : texte imprimé Auteurs : K. J. Bienkiewicz, Auteur ; Czeslaw Krawiecki, Auteur Année de publication : 1977 Article en page(s) : p. 34-41 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption Adsorption Alumine Chrome Collagène Cuirs et peaux Eau 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 Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Water sorption capacity of tanned, spun collagen fibres has been examined and compared with that of standard, tanned and acylated hide powders. Chromium, chromium-alumina, glutaraldehyde and combined tannages have been applied. In spite of that the applied tannages engage different functional groups-only small differences in water sorption capacity have been observed-these do not exceed 20% of total value. Note de contenu : - Tables : Sorption capacity of collagen fibres En ligne : https://drive.google.com/file/d/1iETJn5Ph3AIRJoChQimXKDLa3w_C25a3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31880 [article]

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