Glyoxylic acid : an interesting contribution to clean technology / Karlheinz Fuchs in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVIII, N° 1 (11/1993)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVIII, N° 1 (11/1993) . - p. 402-415 Titre : Glyoxylic acid : an interesting contribution to clean technology Type de document : texte imprimé Auteurs : Karlheinz Fuchs, Auteur ; Rainer Kupfer, Auteur ; John W. Mitchell, Auteur Année de publication : 1993 Article en page(s) : p. 402-415 Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In nearly all countries on earth the protection of the environment has become increasingly a very serious concern. As a result, those producing idustrial and consumer products must strive to reduce environmental strain. Main causes of concern for tanners are the chrome-containing effluents from chrome tanning, washing, neutralization, retanning, and dying. These have been studies in Hoechst and the authors are pleased to now present a constructive solution: a glyxylic acid pickling process for chrome tanning that considerably reduces the chronium content of tannery effluents (extraordinary fixation, minuscule leaching). It is already well established in many tanneries in Germany, Europe and other parts of the world. Glyoxylic acid becomes an aid to tanning by converting amine groups in collagen to carboxyl groups, creating additional sites for chrome to combine with the collagen, witch causes the chrome offered to be better exhausted and more strongly fixed than a conventional tannage. Advantages of the glyoxylic acid pickle include: exceptional chrome exhaustion; leaching is drastically reduced during wringing, washing, and retanning; conventional chrome tanning salt is used; chrome is offered at a reduced level; grain wrinkles level; and it is liquid for automated feed systems. En ligne : https://drive.google.com/file/d/1obRwOG5evU3usqEg3-S-XQMtJdZfuX-Q/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8143 [article]

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Silicone dioxyde : environmentally friendly alternative for wet white manufacture / Karlheinz Fuchs in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXX, N° 6 (06/1995)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXX, N° 6 (06/1995) . - p. 164-176 Titre : Silicone dioxyde : environmentally friendly alternative for wet white manufacture Type de document : texte imprimé Auteurs : Karlheinz Fuchs, Auteur ; Rainer Kupfer, Auteur ; John W. Mitchell, Auteur Année de publication : 1995 Article en page(s) : p. 164-176 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Silicon and oxygen are the most abundant elements on earth. When chemically combined they form naturally occuring silicon dioxyde and silicates with widely differing structures. Minerals found in nature and based on these elements are numerous. Silicates have been widely used in technical applications for a long time. Pure silicon as a material for electronic components laid the foundations of the computer age has had a crucial influence on our era. In leather manufacture, by contrast, the silicon compounds have so far been of only minor importance. With the development of a specific colloidal aqueous suspension of silicon dioxyde gel, a major step has been taken toward making this class of substances accessible to and usable in leather manufacture. This compound enables pelts to be processed into wet white, a stabilized hide material that can be subjected to mechanical operations and then can be subjected to mechanical operations and then to any kind of tanning. the hide waste producted in splitting, shaving, and trimming is free from environmentally polluting chemicals and presents no problems in disposal or recycling. Since the collagen is hardly altered by silica (unlike wet white processed with tanning agents that affect the collage fibre structure), subsequently tanned hides retain their charactéristic properties and undergo no adverse changes. This also means no restrictions need be placed on the collagen offal of trimming and shaving, which expands the array of their possible uses and value in the market. Note de contenu : - INTRODUCTION : In the beginning ... the claims - Environmental audit - Wet white economics - EXPERIMENTAL : Silicon dioxide wet white system - Health and toxicity - Stability of the dispersion - RESULTS AND DISCUSSION : Influence of pH - Interaction of feliderm W with collagen - Does it tan ? - Further work - How to tan the ECO leather En ligne : https://drive.google.com/file/d/18sl4hEUCFj5nc-4xIxu6o9xqmmZr-wyd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7941 [article]

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The crocodile skin / Karlheinz Fuchs / Frankfurt am Main [Germany] : Chimaira (2006)

Titre : The crocodile skin : Important characteristics in identifying crocodilian species Type de document : texte imprimé Auteurs : Karlheinz Fuchs, Auteur Editeur : Frankfurt am Main [Germany] : Chimaira Année de publication : 2006 Collection : Frankfurter Beiträge zur Naturkunde, ISSN 1613-2327 Importance : 175 p. Présentation : ill. Format : 22 cm ISBN/ISSN/EAN : 978-3-89973-455-3 Prix : 69 E Note générale : Trad de : "Die @Krokodilhaut" - Index - Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de Crocodiles Peau -- Anatomie et histologie Tannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The amended and revised edition of 'Die Krokodilhaut', for the first time published in English, will assist identification and enforcement at all levels : export and import, and within tanning and manufacturing facilities. For customs officers at the point of export, import and re-export, who do not necessarily have the skilled scientific knowledge needed for fine forensic identification, it should at least allow preliminary determinations to be made, based on key characters described and illustrated in the book. Skins at least should be easily identifiable to species. Karlheinz Fuchs is truly a remarkable person who has gained a worldwide reputation within both the scientific and industrial communities. His scientific research on taxonomy and his research into tanning chemistry and technologies are both areas where he has achieved international leadership. He has channelled his professional activities with both passion and enthusiasm for more than four decades, often in an honorary capacity. This has provided the trade with high-quality biological resources for the reptile skin industry, whilst directing the same passion to the conservation of crocodilians and other herpetofauna in both developed and developing nations around the world. As a Iongstanding member of the Crocodile Specialist Group of die Species Survival Commission (SSC), of the IUCN-World Conservation Union, he has always committed himself to the principle of sustainable use. He has often used his charming and cosmopolitan manner to influence authorities in many countries — to prioritise the conservation of threatened species as a critical first step towards achieving sustainable use. As Chairman of the IUCN-SSC Crocodile Specialist Group I am simply delighted that an updated English version of 'Die Krokodilhaut' is now available. I know it will become a standard text for those with an interest in taxonomy, anatomy and enforcement. h will assist in the ongoing implementation of CITES, and as such, will contribute in a real way to die ongoing conservation of die world's crocodilians and to die principles of sustainable use that will ultimately underlie the ability of people to have both abundant wild crocodile populations and the products made from crocodilians. Note de contenu : - 1. Introduction - 2. Material and methods of identification - 3. Histology and microscopic anatomy of the crocodilian skin - 4. Short introduction to tanning technology - 5. Brief explanation of some technological terms used in reptile leather manufacture - 6. Key to the identification of crocodilian belly skins - 7. Identification of crocodilian species Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34027

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