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Foam systems - A novel type of finishing technology / W. Löbig in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 1 (01-02/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 1 (01-02/1997) . - p. 1-4 Titre : Foam systems - A novel type of finishing technology Type de document : texte imprimé Auteurs : W. Löbig, Auteur Année de publication : 1997 Article en page(s) : p. 1-4 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition Mousse (chimie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : I have chosen the title "Novel type of finishing technology" as, although we had already started back in the 60s to apply foam finishes to leathers, contrary to today's methods, we then used to work with chemical foams. The making of foam at that time was a relatively simple procedure, as long as you were able to handle the necessary products and technologies. We added to the pigment-binder-mixture a so-called propellant, for example trichlorofluoroethane with a defined boiloing poit of 47.6°C and applied the mixture on normal spraying facilities. During the drying process gas escaped from the mixture, leaving a cell-like structure similar to a foam layer which could then be embossed. The basic idea is still the same. Due to price pressure and the decreasing quality of available raw material, we apply with a single process an even foam layer. This method results in an upgrading due to the excellent covering powers of the foam which guarantees to cover all faults and defects in the raw material, like thorn scratches, fire-brands and insect bites. The foam method allows us to increase productivity considerably by keeping the sme equipment and manpower level. The embossing of the leathers is superior to any other conventional finish, as they do not harden and keep their soft and natural touch. The leathers, can be milled and at the same time gives very good fastness values. Last but not least, the leathers possess a very good water vapour permeability. As you will remember, the use of these propellants, however, was limited in the first place and later on forbidden due to effects on the ozone layer and the continuous growth of the so-called ozone hole. These restrictions and environmental issues, inspired us to try to produce foam for leather finishes mechanically. In this connection we would also like to mention that Cliarant GmbH played a pioneer role in the sector of purely aqueous finishing systems. The same applies today for the foam system offered by us ("Melio"), which refers to leather finishing with mechanical foams. En ligne : https://drive.google.com/file/d/1fxyCekp_Mw3bnK-4y3u6_B8_P7VeVkxZ/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8074 [article]

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Extraction of value added byproducts from the treatment of chromium containing collagenous leather industry waste / Maryann M. Taylor in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 1 (01-02/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 1 (01-02/1997) . - p. 5-13 Titre : Extraction of value added byproducts from the treatment of chromium containing collagenous leather industry waste Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Luisa F. Cabeza, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown, Auteur ; C. J. Thompson, Auteur ; Edward J. Diefendorf, Auteur Année de publication : 1997 Article en page(s) : p. 5-13 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Tannage  chrome  Extraction  sous-produits  collagène  Déchets  solides  Industrie  cuir  Traitement  alcali  enzymes  Produits  hydrolisés  Recyclage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the United States, over 60 000 metric tons of chromium containing solid waste is generated by the leather industry each year, and approximately ten times this amount is generated world-wide. Environmental concerns and escalating landfill costs are becoming increasingly serious problems to the leather industry and alternative disposal methods are needed. We have developed two processes in which this waste is treated with alkali and enzymes to extract hydrolyzed and gelable protein products and a recyclable chromium cake. We have demonstrated that these processes are repeatable with respect to their chemical and physical properties and that good and repeatable material balances are obtained. The isolated chromium can be chemically treated and recycled into the tanning process. The recovered protein fractions, practically devoid of chromium, could be used in a wide range of products, including adhesives, cosmetics, films, animal feed and fertilizer. En ligne : https://drive.google.com/file/d/186TYoO7d7ao1ilMwxu-b8rmf_AsfGLuk/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8075 [article]

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Chemical and physical interactions involved in leather dyeing / D. Muralidharan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 1 (01-02/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 1 (01-02/1997) . - p. 14-20 Titre : Chemical and physical interactions involved in leather dyeing Type de document : texte imprimé Auteurs : D. Muralidharan, Auteur Année de publication : 1997 Article en page(s) : p. 14-20 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Teinture  cuir  Colorant  Adsorption  Cinétique  Thermodynamique  Taux  teinture  Chaleur  Poudre  modifiée  Analyse  échantillons  solvants Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Studies on the interactions involved in leather dyeing have been carried out using natural and chemically modified hide powders with five different leather dyes (C.I. Acid Yellow 36, C.I. Basic Brown 4, C.I. Mordant Violet 5, 1:1 chromium III complex of C.I. Mordiant Violet 5 and 1:2 chromium III complex of C.I. Mordant Violet 5). Kinetic and thermodynamic aspects such as the rate of dyeing, heat of dyeing, adsorption and affinity of these leather dyes on native and modified hide powders have been studied to obtain indirect evidence regarding the nature of dye-fibre bonds. Heat of dyeing values for most of the dyes studied were found to be less than 10 kcal mol-1 indicating that physical adsorption was mainly responsible for the uptake. The dyed samples of hide powders were subjected to stripping with different solvent systems for additional data to supplement our findings. En ligne : https://drive.google.com/file/d/19uzIX8Y47CuaBL8IZ8YhUwpM5orBuDjC/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8076 [article]

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Setting of consent limits for tanning industry trade effluents / R. M. Davies in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 1 (01-02/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 1 (01-02/1997) . - p. 32-36 Titre : Setting of consent limits for tanning industry trade effluents Type de document : texte imprimé Auteurs : R. M. Davies, Auteur Année de publication : 1997 Article en page(s) : p. 32-36 Langues : Anglais (eng) Catégories : Chimie industrielle -- Législation Eaux usées -- Analyse Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The companies which comprise the United Kingdom Tanning Industry, almost without exception, discharge all effluents arising from their processes into a suitable public foul sewer The local Water Service Company (WSC) has a responsibility to set appropriate consent conditions. The conditionsmust afford the wastewater network and treatment processes sufficient protection, whilst being both equitable andjust. It is the aim of this paper to assess the potential impact upon WSC assets and to examine the rationale behind setting of consent conditions. Where applicable, the environmental fate of some of the components present has also been assessed. Note de contenu : - INTRODUCTION : UK legislation - Composition of tannery effluents - EFFLUENT COMPOSITION : Sulphides - Sulphates - Chromium - Ammonium compounds - Separable oils & grease - Chlorides - TOXICITY BASED CONSENTS - SETTING CONSENT CONDITIONS : Sewer network - Receiving WwTW - Receiving watercourse En ligne : https://drive.google.com/file/d/1jKmENh9Xn5upREtbprG3bbQA2suP81cT/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33369 [article]

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