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Vegetable tannins and tanning / J. C. Bickley in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 76, N° 1 (01-02/1992)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 76, N° 1 (01-02/1992) . - p. 1-5 Titre : Vegetable tannins and tanning Type de document : texte imprimé Auteurs : J. C. Bickley, Auteur Année de publication : 1992 Article en page(s) : p. 1-5 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The paper presents a necessarily brief review of tannins and tanning, covering the following topics. Tannins : Occurence of tannins in nature, reason for existence and relationship to plant metabolims. Chemical types - classification into condensed tannins, ellagitannins and gallotannins. Tanning : Tannin/protein interaction - electrovalent and hydrogen bonds and hydrophobic interaction. Equilibrium between tannin and protein-tanning as a polar absorption. Principles of vegetable tanning. Importance of acids, salts and other osmotic considerations. En ligne : https://drive.google.com/file/d/1Dq2C9c9znRo7b0CKqkoU4U8KIKIpcakX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8640 [article]

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Precision measurements in the determination of chrome and substances soluble in dichloromethane / M. J. Holt in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 76, N° 1 (01-02/1992)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 76, N° 1 (01-02/1992) . - p. 6-10 Titre : Precision measurements in the determination of chrome and substances soluble in dichloromethane Type de document : texte imprimé Auteurs : M. J. Holt, Auteur ; N. Seville, Auteur Année de publication : 1992 Article en page(s) : p. 6-10 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In conjunction with the Chemical Analysis committee of the SLTC, Interlaboratory trials were organised for the testing of chrome as Cr203 and substances soluble in dichloromethane usine BS 1309. Initial results indicated problems with specific laboratories who could not provide results to an adequate level of precision. These problems have been resolved on an individual basis and highlighted errors in equipment, methodology and calculation. The results from all laboratories indicate more general problems in using BS 1309. En ligne : https://drive.google.com/file/d/1pUNFz_sJBC97mmF4Bp_cEOBfotoJDgER/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8641 [article]

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Chitosan in leather production. Part 2 / Stephen M. Burkinshaw in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 76, N° 1 (01-02/1992)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 76, N° 1 (01-02/1992) . - p. 11-16 Titre : Chitosan in leather production. Part 2 : Further studies of the dyeing behaviour of chitosan treated leather Type de document : texte imprimé Auteurs : Stephen M. Burkinshaw, Auteur ; M. F. Karim, Auteur Année de publication : 1992 Article en page(s) : p. 11-16 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The rate and extent of uptake of C. I. acid yellow 83 onto chrome grain leather were enhanced by means of pretreatment with chitosan, the extent of this enhancement being greater for chitosan formate than for chitosan acetate. The pH of application of the polyaminosaccharide had a marked effect upon adsorption of C. I. acid yellow 83 with pH 4 yielding maximum dye uptake ; pretreatment also improved the dry cleaning fastness of the dye on chrome grain leather. Optical micrographs of the grain side of chrome grain leather which had been pretreated with chitosan and dyed using C. I. acid yellow 83 showed the presence of a distinct dye-chitosan "layer" situated at the fibre surface. SEM micrographs revealed that pretreatment also improved the fullness of the leather. Pretreatment with the cationic polymer was found to reduce both the rate and extent of uptake of C. I. acid brown 75 and C. I. acid direct 106 onto chrome grain leather possibly as a result of the high substantivity and low diffusional power of the two dyes. En ligne : https://drive.google.com/file/d/1eACqGnDfmzGwcSkBZuP9RayHMc67vGe-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8642 [article]

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Environmental & safety issues - clean technology and environmental auditing / K. T. W. Alexander in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 76, N° 1 (01-02/1992)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 76, N° 1 (01-02/1992) . - p. 17-23 Titre : Environmental & safety issues - clean technology and environmental auditing Type de document : texte imprimé Auteurs : K. T. W. Alexander, Auteur ; D. R. Corning, Auteur ; N. J. Cory, Auteur ; V. J. Donohue, Auteur ; R. L. Sykes, Auteur Année de publication : 1992 Article en page(s) : p. 17-23 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather production yields emissions to water, land and air - all of which are increasingly subjected to legislative control. Furthermore, safety for employees within the work place has to ensured. Compliance with this increasingly complex regulatory system precludes single objective approaches. Environmental auditing is a systematised approach to identifying the problems within a particular sector or production unit. To ensure that the leather industry can effectively reduce its environmental impact, BLC is co-ordinating two international projects to provide reliable information on the real, as distinct from claimed, status of clean technologies applicable to this sector. Monitoring of the work place and its emissions makes analytical demands beyond the scope of traditional tannery laboratories and recent developments will be reported. En ligne : https://drive.google.com/file/d/1YDQawlXsLkT4uOQdj7KGlpXsTmYHa83Y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8643 [article]

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