Design of a pilot plant for complete processing of by-products of the tanning industry. Preparation of a collagenic material with "zero" chrome content / J. Cot in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVI, N° 4 (04/1991)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVI, N° 4 (04/1991) . - p. 141-158 Titre : Design of a pilot plant for complete processing of by-products of the tanning industry. Preparation of a collagenic material with "zero" chrome content Type de document : texte imprimé Auteurs : J. Cot, Auteur ; Albert M. Manich, Auteur ; C. Aramon, Auteur ; M. Baucells, Auteur ; M. Roura, Auteur ; G. Lacort, Auteur Année de publication : 1991 Article en page(s) : p. 141-158 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure En ligne : https://drive.google.com/file/d/1I48t7HRlpSGblpkvJ0PiVBLgzfGj6_S9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8547 [article]

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Design of a pilot plant for complete processing of tanning industry by-products. Preparation of a collagenic material with zero chrome level / J. Cot in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 75 (Année 1991)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 75 (Année 1991) . - p. 114-121 Titre : Design of a pilot plant for complete processing of tanning industry by-products. Preparation of a collagenic material with zero chrome level Type de document : texte imprimé Auteurs : J. Cot, Auteur ; Albert M. Manich, Auteur ; C. Aramon, Auteur ; M. Baucells, Auteur ; M. Roura, Auteur ; G. Lacort, Auteur Année de publication : 1991 Article en page(s) : p. 114-121 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The future of the tanning industry is concerned fundamentally with three areas : (a) raw materials, (b) energy and (c) environment. With regard to raw materials the trend is towards making the fullest possible use of these products, which involves the processing of all by-products of the tanning industry. In this work a pilot plant for the treatment of the different by-products of the tanning industry has been devised. The essential chemical process is based on the oxidising action by hydrogen peroxide in an alkaline medium of the chrome (III) present in the by-products, which permits the formation of inter and intrafibrilar peroxochromate compounds which have great oxidising capacity. By adjusting the amount of hydroxyl ions in the bath,the amount of hydrogen peroxide and the volume of the bath ; we may obtain either, the total solubilization of the by-products, or a dechroming effect, whilst maintaining the original macromolecular fibrous structure. Furthermore, the chemical process of dechroming is without doubt of great importance due to the overall volume of chromed by-products generated by mechanical operations, such as : splitting, shaving, and trimming are chrome tanned. For this reason, we sought to produce a collagenic material with unchanged physico-chemical characteristics and with a zero chrome level. To this end, we made an optimization study of the Box-Behnken type to enable us to study the most signficant variables that intervene in this process and, to allow us to obtain the optimum conditions in order to achieve an end product with a zero chrome level. Thus, this represents new openings for the application of chromed by-products in the fields of medicine, food, cosmetics with a substantial increase in the added value of the recovered final product. En ligne : https://drive.google.com/file/d/1_ZqN-yqBr8i5JD2Mgp8k5zaJjeGR5u3Z/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8682 [article]

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A study of the grain layer using a scanning electron microscope (SEM) fitted with an energy dispersive X-ray analyser : Part 1 / J. Cot in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 73 (Année 1989)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 73 (Année 1989) . - p. 42-46 Titre : A study of the grain layer using a scanning electron microscope (SEM) fitted with an energy dispersive X-ray analyser : Part 1 : The contribution to quality improvement in defective chrome tanned leathers Type de document : texte imprimé Auteurs : J. Cot, Auteur ; C. Aramon, Auteur ; M. Marsal, Auteur Année de publication : 1989 Article en page(s) : p. 42-46 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Woolled sheepskins showing partial hair-slip were extensively studied. This defect is detected in the "crust" state. Shearlings are first fully dechromed, subsequently de-woolled and chrome tanned. The influence of either a partial or complete beamhouse operation on the finished layer is examined. On the grain layer, these leathers show modifications of the collagen, which show up in the form of irreversibly dried areas, different degrees of overheating (bare areas), residual epidermal layer and cementing materials (e.g. mucoids and mucopolysaccharides), as a consequence of not having had a proper liming and bating treatment. By means of the scanning electron microscope (SEM) coupled to an X-ray dispersive energy analyser (EDAX) it is possible to explore, first, the morphology of the grain layer and, secondly, the surface distribution of the inorganic elements, such as : sodium, potassium, calcium, chlorine, sulphur and chromium, especially the two latter elements. A quantitative analysis can carried out, in order to compare faulty and undamaged areas, by means of this advanced technique which makes it possible. : a) to determine how the chrome is distributed on the surface, b) to make a detailed "mapping" of the areas studied and to visualise them through photography, where both maximum and minimum accumulation of surface chrome can be observed, c) to detect and diagnose similar defects in much smaller areas, to be found in leathers intended for processing into "nappa" (processing without either wool or hair) and in "wet-blue" imported leathers. Once the nature of the defect becomes known and, provided that no irreversible alterations in the collagen protein have taken place, it will be possible to optimise processing in order either to eliminate or to reduce such a defect to negligible levels. In this manner, the quality of the end-product will be improved substantially. En ligne : https://drive.google.com/file/d/16TPegrXtY8TcLXo_Vc9WVIuJKc_JU301/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8826 [article]

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Waste processing in the tannery : production of gelatin, reconstituted collagen and glue from chrome-tanned leather splits and trimmings subjected to a modified detanning process / M. Baucells in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 70 (Année 1986)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 70 (Année 1986) . - p. 69-76 Titre : Waste processing in the tannery : production of gelatin, reconstituted collagen and glue from chrome-tanned leather splits and trimmings subjected to a modified detanning process Type de document : texte imprimé Auteurs : M. Baucells, Auteur ; C. Aramon, Auteur ; M. Roura, Auteur Année de publication : 1986 Article en page(s) : p. 69-76 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Note de contenu : 1. INTRODUCTION : By-products of the leather industry / General aspects of research on by-products recovery. 2. EXPERIMENTAL : Process of maximumchrome removal / Determination of residual chromium content by means of inductively coupled plasma atomic emission spectrometry (ICP) : Apparatus and working conditions - Reagents - Sample preparation - Procedure and results / Operative conditions of detanning (dechroming) of this type of by-product. 3. INDUSTRIAL APPLICATIONS OF PROCESSED BY-PRODUCTS : Treatment after dechroming : maceration and extraction / Production of blud and/or gelatin / Reconstitued collagen. Conservation of physico-chemical character and of conformation in the collagen molecule / Production of protein flour / Economic considerations on quality of gelatin, re-constitued collagen, glue and protein flour, obtained by this method. Study to be carried out in future. En ligne : https://drive.google.com/file/d/1mzh0ITY1I9Kc-hwQZ_wXHJQm76U5ZArr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9209 [article]

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