Changes to bovine hides during leather processing / L. J. Stephens in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 77, N° 3 (05-06/1993)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 77, N° 3 (05-06/1993) . - p. 71-74 Titre : Changes to bovine hides during leather processing Type de document : texte imprimé Auteurs : L. J. Stephens, Auteur ; J. A. Werkmeister, Auteur ; John A. M. Ramshaw, Auteur Année de publication : 1993 Article en page(s) : p. 71-74 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Immunohistology has enabled the identification and localisation of individual connective tissue components in bovine hides. This approach allows examination of components which may not be readily studied by chemical analysis because they are present in only small amounts, for example type VII collagen. The changes in these components during the initial stages (liming, bating and pickling) of hide processing into leather have been followed, particularly in the grain enamel (surface). The data showed no clear changes to major structural components of the hide, for example types I, III and VI collagens. Type VII collagen remained in the grain layer, where it may still be anchoring residual components of the basement membrane, after liming, bating and pickling steps. The use of bating during processing may change the coposition of the grain enamel by causing more effective removal of certain components such as laminin. However, use of a processing strategy known to cause grain damage, led to complete loss of reactivity to type IV and type VII collagens and laminin. These date support the role of components of the basal lamina in providing the final surface of leather. En ligne : https://drive.google.com/file/d/1zDmLLv-yfCgsW8P7OEtgICQMAgLd--8M/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8497 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
006992	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Colorimetric assessment of wool fabric staining as a model for studying reduction of chromium staining during tanning of woolly sheepskins / L. J. Stephens in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 67 (Année 1983)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 67 (Année 1983) . - p. 1-4 Titre : Colorimetric assessment of wool fabric staining as a model for studying reduction of chromium staining during tanning of woolly sheepskins Type de document : texte imprimé Auteurs : L. J. Stephens, Auteur Année de publication : 1983 Article en page(s) : p. 1-4 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite. L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement. L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium. Chimie textile Chlore Chrome Colorimétrie Cystéique, Acide Laine de mouton Tannage au chrome Textiles et tissus Traitement chimique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A technique of colour measurement has been used on standard wool fabric to evaluate the colour differences between various treatments in the chrome tanning system and to enable the best system to be chosen for tanning trials. The variability of wool colour between and within skins is eliminated in this evaluation procedure. Of the additives testes, this work has shown aluminium sulphate to be the most effective in the tanning bath to reduce chromium staining of the wool. Note de contenu : - Wool fabric - Apparatus - Chlorine treatment - Pretreatment experiments - Simulated tanning treatment - Colour measurement - Cysteic acid analyses - Aluminium and chromium content - Table 1 : Chromium contents and ΔE values obtained after chrome "tanning" of variously pre-treated wool fabrics - Table 2 : ΔE values comparing chlorine-treated wool fabric with the same fabric after chromium "tanning" with various additives in the chromium bath. (chlorine treated cloth with a cysteic acid content of 69 µ mol g-1) - Table 3 : As table II using chlorine-treated fabric with a cysteic acid content of 56 µmol g-1 and including chromium and aluminium congtents of some of the wools in mg g-1 En ligne : https://drive.google.com/file/d/1hw5l57Qz-UFn64gIoF_leIvY1yl0wzGR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34167 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
007130	-	Périodique	Bibliothèque principale	Documentaires	Disponible

A comparative morphology of kangaroo and bovine leathers / J. H. Bavinton in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXII (Année 1987) . - p. 197-199 Titre : A comparative morphology of kangaroo and bovine leathers Type de document : texte imprimé Auteurs : J. H. Bavinton, Auteur ; D. E. Peters, Auteur ; L. J. Stephens, Auteur Année de publication : 1987 Article en page(s) : p. 197-199 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux de bovins Cuirs et peaux de kangourous Morphologie (matériaux) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Collagen fibre bundles, which are the structural components of skin and leather, are organized in a variety of ways. Each species of animal has a characteristic arrangement, although in many cases they are similar. In animals which are commonly used for leather production, such as cattle and sheep, the arrangement of the fibre bundles has been well studied, and the existence of a relationship between the fibre bundle orientation and the physical properties of the leather is recognized. Diseases of the collagen may also have a profound effect on skin strenth. The strength of leather depends therefore on the arrangement of the collagen fibre bundles and, presumably also on the strength of the collagen itself. Although kangaroo leather has not been studied to the same extent as the more commonly used leathers, recent studies on its physical properties and stratigraphic strength analysis have shown that there are differences between kangaroo and other leathers. To ensure that full use may be made of its capabilities, a better understanding of its structure is needed. This paper reports a histological study of kangaroo leather and compares it with bovine leather. En ligne : https://drive.google.com/file/d/1DG1ODE2PPey865TN7K87_gDWewPiwa55/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8994 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008087	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Reduction of chromium staining of wool during sheepskin taning - effect of aluminium sulphate / L. J. Stephens in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 69 (Année 1985)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 69 (Année 1985) . - p. 68-70 Titre : Reduction of chromium staining of wool during sheepskin taning - effect of aluminium sulphate Type de document : texte imprimé Auteurs : L. J. Stephens, Auteur Année de publication : 1985 Article en page(s) : p. 68-70 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : During chromium tanning of wooly sheepskins, weathered areas of the wool take up chromium and the resultant green colour persists through to the finished product. Testing of skins using both recycled bath and single-bath situations after additions of aluminium sulphate to the tanning bath has shown reduction of the chromium content and colour of the wool on the tanned skins. Limited physical testing of these skins has aslo shown no change in properties tested compared with skins tanned without aluminium added, with the exception of lower tear strength. Note de contenu : EXPERIMENTAL : Skins - Small-scale recycle tanning - Larger scale batch tanning - Analyses - Physical testing. En ligne : https://drive.google.com/file/d/1GIfy_kjfBaSAiUy8Sn0qdFeeJPzVoHVB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9401 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
007132	-	Périodique	Bibliothèque principale	Documentaires	Disponible

A simple method for the combined determination of both zirconium and aluminium in leather and tanning solutions / L. J. Stephens in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. N° 71 (Année 1987)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. N° 71 (Année 1987) . - p. 10-11 Titre : A simple method for the combined determination of both zirconium and aluminium in leather and tanning solutions Type de document : texte imprimé Auteurs : L. J. Stephens, Auteur Année de publication : 1987 Article en page(s) : p. 10-11 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The determination of zirconium and aluminium in solution has been documented previously and the complexometric titration method for zirconium using EDTA has proved successful for rapid and single analyses of both tanning baths and leather in this laboratory. During experiments with zirconium tanning in the presence of high concentrations of aluminium, a method was developed for determining both metals, with one simple titration, without the usual need to separate the two prior to analysis. The preferred method of analysis for aluminium when titrating with EDTA involves a back-titration in the presence of excess EDTA. Determination of aluminium by direct titration, due to its slow reaction with the low concentration of EDTA available at acid pH., causes difficulty in assessing the end-point. Also, the interference by aluminium in the titration of zirconium with EDTA is due to some reaction of the aluminium under the titration conditions. As this reaction is slow and pH-dependent, a study of titre versus pH was undertaken to determine if there were conditions where each metal could be titrated independently of the other. The method developed gave reduced accuracy for aluminium analysis compared with the back-titration method or with the standard method using CDTA as titrant. En ligne : https://drive.google.com/file/d/19XSmwok4OHLshotyO5RUABq5atl116Hx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9142 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
007135	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Stratigraphic analysis of kangaroo leathers / L. J. Stephens in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)  

Permalink

The effect of preservation by freezing on the strength of kangaroo leathers / L. J. Stephens in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)  

Permalink

The physical properties of leather from kangaroo skins I - Comparison between species and sexes / D. E. Peters in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)  

Permalink

The physical properties of leather from kangaroo skins II - Variation in properties with sampling position / L. J. Stephens in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)  

Permalink

The physical properties of leather from kangaroo skins III / L. J. Stephens in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)  

Permalink

The physical properties of leather from kangaroo skins IV - Comparison of tannages for hair-on skins / D. E. Peters in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)  

Permalink

The physical properties of leather from Kangaroo skins V. Comparison of hair-on and unhaired tannage / L. J. Stephens in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXV (Année 1990)  

Permalink

---

1 (1 - 12 / 12)