Dépouillements

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)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 6 (06/1970) . - p. 210-216 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 Echantillonnage Index. 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 variation En ligne : https://drive.google.com/file/d/1ifSsax0pveqBIhqyb0ouFbDaEPyYgkrx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40713 [article]

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Electron microscopy in leather research / V. Mohanaradhakrishnan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 6 (06/1970)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 6 (06/1970) . - p. 217-225 Titre : Electron microscopy in leather research Type de document : texte imprimé Auteurs : V. Mohanaradhakrishnan, Auteur ; P. L. Muthiah, Auteur Année de publication : 1970 Article en page(s) : p. 217-225 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène Cuirs et peaux Cuirs et peaux -- Analyse Irradiation Microscopie électronique Prétannage Recherche Tanins Tannage Température de retrait Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : While the chemical composition of a substance is conveniently determined by analytical chemical means and the gross structure assessed by microscopical techniques, the borderline area—ranging from tens of ángströms to a few millimicrons—could well be investigated using an electron microscope. One can not only observe the various entities and study their morphology but also follow the reactions that a substance undergoes when subjected to several treatments. The advantages of modern electron microscopy include, apart from the require ment of small quantities of sample, stereoscopic view, possibility of heating or cooling the sample, and observation of the specimen under moist conditions. The results obtained from electron microscopical analyses can broadly be discussed under the following headings : (a) Raw material-Collagen (b) Tanning materials (c) Effect of pre-tanning and tanning operations on collagen (d) Other modifications such as irradiation (e) Miscellaneous Note de contenu : - Raw material-collagen : Fibrils - Other Forms of Collagen Aggregates - The molecules - Amino acids - Intra- and inter-molecular crosslinks - Tanning material - Effect on collagen of pre-tanning and tanning operations : Beam-house operations - Tanning operations - Other modifications of collagen : Shrinkage - Irradiation - Miscellaneous En ligne : https://drive.google.com/file/d/1XOZ9XZzzhxB2uhOr4HtFkgZuQntDhfmO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40714 [article]

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Studies on shoe climate contributing to comfort / Y. Nayudamma in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 6 (06/1970)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 6 (06/1970) . - p. 226-236 Titre : Studies on shoe climate contributing to comfort Type de document : texte imprimé Auteurs : Y. Nayudamma, Auteur ; D. H. Kamat, Auteur ; P. L. Muthiah, Auteur ; N. Ramanathan, Auteur Année de publication : 1970 Article en page(s) : p. 226-236 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaussures Confort Humidité Transpiration Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather is the traditional material for the fabrication of boot and shoe, the reasons being probably (a) its aesthetic value, and (b) the comfort it can impart in wear. The comfort in shoe wear depends on the physical and physicochemical properties of the shoe material and on the physiological and psychological aspects of the wearer. The physiological feeling of comfort depends, as is well known, on the ambient relative humidity and temperature. Hence it is important to determine the temperature and relative humidity over the feet enclosed in shoes and to correlate the resultant values with the feeling of comfort or other wise so as to understand how far the properties of shoe materials influence these values and in order to know which materials impart greater physiological comfort. Studies have been made to determine the increase in the weight of the shoes due to accumulation of perspiration.”2The properties of shoe materials have been investigated.3—’Attempts have also been made to determine the shoe climate. Gran8used leather pieces, conditioned to equilibrium, to determine the relative humidity inside shoes. Kennedy2et a!. improved the method of determination of relative humidity using woollen pieces conditioned at O°/ r.h. However, the data for the relative humidity and temperature inside shoes was not available (a) for different hours of wear and (b) when the shoes would become comfortable or uncomfortable in wear. Hence, in the present study, the relative humidity and temperature at several regions of the foot were determined after various periods of wear. In addition, the shoes were made deliberately uncomfortable in wear, by covering the nylon socks, usually worn, by plastic socks which acted as an impermeable barrier. The relative humidity and temperature were determined when the subjects expressed discomfort. Using these values, an attempt is made to arrive at an index, the maximum and minimum values of which might give an idea as to under what conditions of temperature and relative humidity persons might feel comfortable in shoes. Note de contenu : - EXPERIMENTAL : Determination of relative humidity - Temperature measurement - measurement of various properties of shoe leathers - RESULTS AND DISCUSSION : Effect of cold climate on comfort in shoes - Table 1 : Relative humidity and temperature inside the shoe with chrome tanned upper - Table 2 : Relative humidity and temperature inside the leather shoe with chrome retanned upper - Table 3 : Physical properties of materials used for construction of shoes - Table 4 : Relative humidity and temperature inside the shoe with chrome tanned upper and with impermeable plastic socks over nylon socks - Table 5 : Feeling of comfort in shoes at various periods of wear - Table 6 : Temperature humidity index (itti) for shoes with chrome tanned upper - Table 7 : Temperature humidity index (ith) for shoes with chrome retanned upper - Table 8 : Temperature humidity index (ith) for shoes with plastic socks over nylon socks - Table 9 : Effect of cold climate on relative humidity and temperature inside the shoe with chrome upper leather - Table 10 : Temperature humidity index (itit) in cold climate for shoe with chrome tanned upper En ligne : https://drive.google.com/file/d/1bUZXspip_ECuf5LS0eNnwEttvoBJo17L/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40715 [article]

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