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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Waterproofing of sole leather / P. L. Muthiah in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 5 (05/1970)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 5 (05/1970) . - p. 183-201 Titre : Waterproofing of sole leather Type de document : texte imprimé Auteurs : P. L. Muthiah, Auteur ; V. Mohanaradhakrishnan, Auteur Année de publication : 1970 Article en page(s) : p. 183-201 Langues : Anglais (eng) Catégories : Alun Couleur Cuir Décapage Essais (technologie) Humidité -- Absorption:Eau -- Absorption Imperméabilisation Produits de nourriture du cuir Retannage Semelles Traitement chimique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The continued and increasing competition from synthetic materials in ail branches of leather industry emphasises the importance of investigations concerned with the improvement of water resistance of leather. Literature survey indicates that a wide variety of materials and methods have been used for improving the water resistance of leather. A suitable material for this purpose demands the following qualities : (a) with a minimum quantity of the material considerable increase in water resistance ; (b) uniform effect throughout the thick-ness of the leather, otherwise the effect will be lost in short time ; (c) preservation of the air and water vapour permeability ; (d) retention of the qualities such as : grip, flexibility and colour ; (e) non-attainment of thermoplastic properties, i.e. the leather must be soft and flexible in a cold climate and should not be sticky at high temperature ; (f) the method of application must be simple ; (g) the materials must be easily available in the market in large quantities and must be cheap. In order to find a suitable waterproofing material for vegetable tanned sole leather, a preliminary study was undertaken using various waterproofing materials and methods, viz. impregnation with different materials, retanning with zirconium, chromium and aluminium salts and basic aluminium sulphate treatment. Preparation of crust vegetable sole leather and the sampling method were the same as described earlier. The well known Kubelka's apparatus was used for determining the water absorption of leathers. Note de contenu : - Impregnation with different materials - Retanning with zirconium, chromium and aluminium salts : Studies using basic aluminium sulphate - Studies on the improvements - Neutralisation of colour - Chemical treatments - Field tests - Results and discussion : Effect of impregnation - Retanning - Studies using basic aluminium sulphate - Effect of oiling before alum treatment - Effect of oiling after alum treatment - Mechanism of waterproofing - Studies on the improvement of colour - Field tests - Table 1 : Effect of waterproofing with various materials - Table 2 : Effect of retanning and alum dipping - Table 3 : Effect of stripping - Table 4 : Effect of re-use of alum liquor - Table 5 : Effect of oiling - Table 6 : Colour of the leathers, processed by various methods - Table 7 : Water absorption of leathers after different treatments En ligne : https://drive.google.com/file/d/1j4LfXSuut-MMCX_O2ejEjIaa-jVTxilK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37008 [article]

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