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Les chaleurs spécifiques de la peau en tripe et des cuirs / R. G. Mitton in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXI (Année 1969)
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Titre : Les chaleurs spécifiques de la peau en tripe et des cuirs Type de document : texte imprimé Auteurs : R. G. Mitton, Auteur Année de publication : 1969 Article en page(s) : p. 10-13 Langues : Français (fre) Catégories : Cuir
Déshydratation
Peaux en tripe
Tannage au chrome
Tannage végétal
TempératureIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Les chaleurs spécifiques de peau en trip déshydratée à l'acétone et de cuirs tannés de diverses manières ont été mesurées dans un champ de 15 à 105°C. Pour des matériaux complètement secs, la chaleur spécifique de la peau en tripe est de 1,36 joules/gC°, selon le genre de tannage et la quantité de tannin incorporé. Si le cuir contient de l'humidité, la capacité thermique du cuir humide est approximativement égale (mais peut être légèrement plus grande) à la somme des capacités thermiques et l'humidité et de celle du même cuir complètement sec. Note de contenu : - Matériaux utilisés
- Méthode de mesure
- Chaleurs spécifiques de cuirs secs et de peau en tripe
- Tableau 1 : Analyses des cuirs
- Tableau 2 : Chaleurs spécifiques de cuirs secs et de peau en tripeEn ligne : https://drive.google.com/file/d/1_3NuXoAYCvPZBd2qeyw-AbxVPnsrIu8V/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36641
in REVUE TECHNIQUE DES INDUSTRIES DU CUIR > Vol. LXI (Année 1969) . - p. 10-13[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008568 - Périodique Bibliothèque principale Documentaires Disponible Low strain characteristics of leather / R. G. Mitton in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 2 (02/1970)
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Titre : Low strain characteristics of leather Type de document : texte imprimé Auteurs : R. G. Mitton, Auteur ; C. Price, Auteur Année de publication : 1970 Article en page(s) : p. 44-53 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaussures
Cuir
Cuirs et peaux de veaux
Déformations (mécanique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Upstone and ward have shown that, in the region of strains below 2% shoe upper leathers frequently have a low elastic modulus, which is much smaller than that for greater extensions. This is likely to be advantageous, because it permits a shoe to take up the shape of the foot without undue pressure, and yet resist deformations large enough to cause unsightliness and loss of shape.
Experiments show that the shape of the stress/strain curve if frequently (and perhaps always) due to stresses in different layers of an unstrained leather, the grain layer being usually in tension when the leather if flat, and the corium and flesh in compression. Any leather strip which does not have this characteristic can be given it by suitable heat 'setting', such that an unstressed flat strip of the leather is left with its grain permanently in tension. Whether the 'steps' of the stress/strain curves are sufficiently large to be of practical importance is not clear. It is possible that heat setting during shoe making relaxes any differential stresses otherwise present, and that the steps consequently disappear in the made up shoe.Note de contenu : - Elastic and plastic changes of length
- The shapes of extension/load curves
- Extension/load curve for a poromeric
- The mechanism of step formation
- Table 1 : Observed and predicted values for two strips of chrome calf leather
- Table 2 : Curvature and apparent extension of a composite stripEn ligne : https://drive.google.com/file/d/11f3gGPrFKiu4dEpWP1xuX6v9abNQ5oSN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36597
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 2 (02/1970) . - p. 44-53[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007080 - Périodique Bibliothèque principale Documentaires Disponible The sampling of sides at edge locations / R. G. Mitton in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 6 (06/1970)
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Titre : The sampling of sides at edge locations Type de document : texte imprimé Auteurs : R. G. Mitton, Auteur ; D. Otterway, Auteur Année de publication : 1970 Article en page(s) : p. 210-216 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux
EchantillonnageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The extensive American work on sampling locations 12, 3, showed which locations give the most accurate estimates of mean values for whole sides. In this work, extreme edge locations were not considered, possibly because they were regarded as unlikely to be satisfactory. However, routine control testing is much more likely to be used in tanneries if the samples can be taken from the edges, where the cutting of the leather is less obvious and less damaging. We have accordingly examined various edge locations for physical tests on sides. An area on the britch edge, 280 mm from the back bone and between 50 and 125mm from the britch edge appears to be only slightly inferior to the best sampling position within the side, and is quite suitable for routine physical testing. The results of chemical analyses are less dependent on location, and the same position could be used for chemical analyses. For smaller sides and skins the distance from the backbone should be decreased to give an anatomically similar location. Note de contenu : - Plan of the experiments : Locations tested - Tests - Calculation of correlation coefficients
- Results and conclusions : Difficulties of finding (or specifying) locations - Correlation coefficients
- Fig. 1 : NBS system for marking locations on sides.
- Fig. 2 : Locations of sampling positions
- Table 1 : Correlation coefficients r for the properties
- Table 2 : Geometric mean values for various ratios
- Table 3 : Within-group variances, standard deviations and coefficients of variationEn ligne : https://drive.google.com/file/d/1ifSsax0pveqBIhqyb0ouFbDaEPyYgkrx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40713
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Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Water vapour absorption by full chrome leather / R. G. Mitton in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 7 (07/1970)
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Titre : Water vapour absorption by full chrome leather Type de document : texte imprimé Auteurs : R. G. Mitton, Auteur Année de publication : 1970 Article en page(s) : p. 248-266 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Cuir
Humidité -- Absorption
HystérésisL'hystérésis (ou hystérèse) et signifiant "après" ou "plus tard", est la propriété d'un système qui tend à demeurer dans un certain état quand la cause extérieure qui a produit le changement d'état a cessé.
Vapeur d'eauIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Absorption and desorption isotherms for water vapour in full chrome leather at 5, 20 and 35°c are given. They agree satisfactorily with those previously found by the author and by Kanagy, but uptakes are higher than obtained by most other investigators, probably because they allowed insufficient time for complete equilibrium. The moisture content at 65% r.h. is far higher than usually assumed in leather analysis. At high humidities, regains exceed 70 %.
Although the outline of the hysteresis cycle was measured by slow approach to equilibrium (years), this period was only necessary because of slow diffusion of moisture through air; the equilibrium values obtained by rapid equilibration in a vacuum are little different. At humidities up to about 60%, the shape of the ascending humidity isotherm is different if the specimens are heated to 100°c beforehand. The descending branch is little changed.
The usual hysteresis cycle defines an area which is crossed by isotherms descending from points on the rising boundary curve, or ascending from points on the descending boundary curve. A number of these isotherms are shown.
Data are given for absorption and desorption at 20°c, 65 % r.h. of leathers with different chrome contents. The width of the hysteresis cycle under these conditions increases with chrome content, probably because crosslinking by chromium reduces swelling during absorption, and reduces shrinking during desorption.Note de contenu : - Leathers used for the experiments
- Measurements of dry weights
- Method of conditioning
- Times to reach equilibrium
- The hysteresis loop
- The hysteresis loop for chrome leather dried without heating
- The hysteresis loop for chrome leather dired at 105°C
- States within the boundary hysterisis loop
- Absorption and desorption at other temperatures
- Application of the brunauer, Emmett and Teller equation
- TABLE 1 : Values estimated from the B.E.T. equation for ascending and descending isothermsEn ligne : https://drive.google.com/file/d/1jvvQhHqMDmm-ON4XBuVrqOcWHHNNKhLO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37017
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 7 (07/1970) . - p. 248-266[article]Réservation
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