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The determination of some physical properties of leather / W. P. Walker in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 11 (11/1970)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 11 (11/1970) . - p. 398-404 Titre : The determination of some physical properties of leather Type de document : texte imprimé Auteurs : W. P. Walker, Auteur Année de publication : 1970 Article en page(s) : p. 398-404 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés physiques Matériau plein Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Although entitled "The Determination of Some Physical Properties", this paper deals mainly with the determination of one particular physical property, namely the "fullness". This property is best defined in a negative way in that in a full leather there is an absence of intrinsic stiffness. The fullness of a leather sample is the inverse of the bending modulus. The important word in this definition is intrinsic. A manual assessment of the softness of a leather sample is affected not only by the intrinsic stiffness of the fibre weave, but by the thickness of the leather and by other factors. It is important to the tanner to be able to determine the intrinsic stiffness of the leather. This property of fullness we determine on the Pierce Flexometer. This apparatus was originally used by Pierce' to determine the properties of textiles but was subsequently adapted by Conabere2 of the B.L.M.R.A. to the determi¬nation of leather properties. The experimental work used in this paper was carried out by Lee and Whitton using a version of the Pierce Flexometer. For this paper I have taken as illustrations of the usefulness of fullness determinations, two investigations made in our laboratories, the first concerning the production of a white leather of suitable properties, the second the selection of the best blend of synthetic and vegetable materials for retanning chromed stock. In these experiments, mixtures of two tanning materials were used and the properties of the different leathers obtained from the different tanning mixtures were related to the composition of the mixtures used. Using this method a tanner can find the mixture of tanning materials which will give him the desired characteristics in his leather or, as is more usual, the best compromise in characteristics. En ligne : https://drive.google.com/file/d/1fshmpz7mPIq9vp6fr0ip7KoE_MWpuaRi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37023 [article]

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The dyeing of wash and dry cleaning fast chamois leather with vinyl sulphone dyestuffs / R. D. Seyd in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 11 (11/1970)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 11 (11/1970) . - p. 405-408 Titre : The dyeing of wash and dry cleaning fast chamois leather with vinyl sulphone dyestuffs Type de document : texte imprimé Auteurs : R. D. Seyd, Auteur Année de publication : 1970 Article en page(s) : p. 405-408 Langues : Anglais (eng) Catégories : Colorants réactifs Colorants vinyl sulfones Cuirs et peaux -- Teinture Cuirs et peaux de Chamois Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Undoubtedly, the leather dyeing industry is striving to obtain better fastness properties in dyeing. Highest fastness properties are demanded of glove and clothing suede leather. For these good wash and solvent fastness properties are desired. But requirements for light, water and perspiration fastness are also of considerable importance. As chamois tannages are stable to alkali, and also washable, they recently have found use for the manufacture of fashionable dress goods. Reactive dyestuffs with a vinyl sulphone group (which include the Remazol dyestuffs) make comparatively high fastness properties on chamois leather possible, which to a very far degree fulfil the fastness demands mentioned in the above. Amongst other dyestuffs that are used for the dyeing of chamois leather are sulphur dyestuffs and anthrasol dyestuffs, which give dyeings with good light and wash fastness. With sulphur dyestuffs, however, the dyeings to be obtained are rather dull in shade. Anthrasol dyestuffs have extremely high prices. When dyeing with these dyestuffgroups they must be made water soluble or in the case of anthrasol dyestuffs are already available in the water soluble form, which is absorbed by the leather and then irreversibly transformed into an insoluble dyestuff, which is very wet fast. When using Azoic Naphtol AS compounds in combination with Azanil or fast colour salts the dyeing process is similar. When using reactive dyestuffs a genuine chemical linkage between dyestuff and collagen takes place, which is responsible for the fastness properties. Chamois tanned suede leather is one of the few kinds of leather that are stable to washing and mild alkalis. It is therefore possible to dye in alkaline liquors and to use vinyl sulphone dyestuffs, which are dyed from such liquors. Note de contenu : - The vinyl sulphone dyestuffs - Application of vinyl sulphone dyestuffs - Dyeing procedure - Properties of dyeing with vinyl sulphone dyestuffs En ligne : https://drive.google.com/file/d/1zCpn7V0yu7aEOHGuRb0SX0pxZydRE9IW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37024 [article]

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