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Optimum chrome tanning ofhides and modified Thrublu process for lime-split hides / Samir Dasgupta in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 17-21 Titre : Optimum chrome tanning ofhides and modified Thrublu process for lime-split hides Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 2005 Article en page(s) : p. 17-21 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning for a long lime enjoyed a unique position amongst tanners all over the world and almost 90% of leather produced is chrome tanned. Of all these benefits, high shrinkage temperature bas been the paramount feature in favour of chrome tanning as this cannot be achieved by any other tanning systems. A number of studies have been published recently suggesting that Chromium(III) itself may be toxic at higher levels under certain ligand environment and Chromium(VI) is a known carcinogen. So, tanners have to consider how best to modify their chrome tanning process for better exhaustion of chrome and look for alternative means to minimise the impact of tanning on the environment. LASRA research has shown that none of the alternatives to chrome free tanning systems are as cost effective and cheap than chrome tanning. The best commercial option is, therefore, to develop an effective chrome management system for the tannery. Several chrome management technologies have emerged recently. Among the options available is the no pickle ThruBlu process, first introduced for lambskins in 1993 at LASRA Conference by DasGupta and further developed and subsequently extended to split hides tannages. h is is the most cost effective and easily adoptable. But this novel system challenges the basic established theory of chrome tanning and therefore demands conviction from tanners. The partial substitution of chromium with alternative tanning agents like Oxazolidine E (Zolidine E, Angus Chernicals), THPS (Albrite AD, Rhodia) is also promising because this combines benefits of both the tanning materials. To develop an effective optimum system, a tanner must first find out what is the minimum amount of chrome that is required to satisfy his customer requirements, both in respect of dye ability and other performance requirements. This is a must before subsequent options can be considered, such as : - Simply recycling the chrome exhaust in pickle - Precipitate the chrome in the exhaust liquor, then deposit the cake in land fill - Precipitate the chrome in the exhaust liquor, regenerate as chrome tanning agent for reuse. This report outlines systems which give an optimum chrome tanning of hides. Further, LASRA ThruBlu process that was originally devised for delimed hides, has been modified for chrome tanning of pickled hides to minimise chrome in exhaust liquors. Note de contenu : - The optimum chrome tannage of hides - Modification of the Thrublu process : Residual formaldehyde in the modified Thrublu leather - Panel 1 : 1. Effect of chrome offer on shrinkage temperature of wet blue sides, °C - 2 : Effect of chrome offer on the residual chrome in exhaust liquor - 3 : Layerwise distribution of chrome in side leather - Panel 2 : 1 : Tear and tensile strength of chrome tanned side leather - 2 : Grain strength of chrome tanned side leather - Panel 3 : The original LASRA ThruBlu process - Panel 4 : 1. Effect of tannage on the shrinkage - 2. Layerwise distributionof chrome in leather - Panel 5 : 1. Tear and tensile strength of chrome side leather - 2. Grain strength of chrome tanned side leather - Panel 6 : Softness of chrome tanned side leather - Panel 7 : Formaldehyde content of chrome tanned side leather En ligne : https://drive.google.com/file/d/1rfPARWOhJl1od96TFxYmhydX-2k77r0M/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32492 [article]

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A new salt-free approach to tanning in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 23 Titre : A new salt-free approach to tanning Type de document : texte imprimé Année de publication : 2005 Article en page(s) : p. 23 Langues : Anglais (eng) Catégories : Polycarbamoyl sulfonates Tannage sans sels Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The following paper provides an overview of a different approach to tanning. The technique is managed in the 'non-swelling' pH zone, and thus eliminates the need for salt within the conventional acid pickle. The fibre stabilisation provided—somewhat similar to a pretannage with glutaraldehyde—allows strong leather characteristics, such as those provided by conventional chrome tannage, to be developed within a main tanning or retanning stage. En ligne : https://drive.google.com/file/d/1AydAqqHdpDC8GItMb04J5q2_oiOfKgCE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32493 [article]

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Anaerobic digestion of tannery sludge : lowering salinity to reduce sludge volume / J. P. Barnard in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 24-28 Titre : Anaerobic digestion of tannery sludge : lowering salinity to reduce sludge volume Type de document : texte imprimé Auteurs : J. P. Barnard, Auteur Année de publication : 2005 Article en page(s) : p. 24-28 Langues : Anglais (eng) Catégories : Boues résiduaires Déchets -- Réduction Digestion anaérobie Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : An investigation was performed to minimise the volume of tannery sludges by bio-degradation. To overcome the inhibiting effects caused by inorganic solubles used in leather manufacture, a nove! technique was employed to reduce the salts content of these sludges. The investigation proved a success, and achieved a significant reduction in the volume of the sludge. In a partnership between UNIDO and Zimbabwe's Bata Shoe Company, the 18-month research programme was conducted under the technical supervision of consultant Johan Barnard, Envirotan Water from South Africa. Bata (Zimbabwe) supported the effort with hardware and day-to-day manpower while UNIDO funded the consultant expertise under the ongoing project "Assistance in Tannery Pollution Control" (US/ZIM/98/069). Note de contenu : - The research concept - The pilot study - The tannery and waste water plant - The pilot anaerobic digester plant - The start-up phase - The loading phase - Control of the digester - Temperature effects - Inhibiting chemicals - Gassing studies - Findings from the investsigation - Panel 1 : Anaerobic digester pilot plant - Panel 2 : pH stabilisation at start-up - Anaerobic digestion of tannery sludge - Panel 3 : Digester space load rate - Anaerobic digestion of tannery sludge - Panel 4 : Percentage reduction of washed sludge En ligne : https://drive.google.com/file/d/1PgzH9jsWDYAsXhBgVh6Qb6tt8jDb9jNC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32494 [article]

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The effect of salinity on the the treatment of tannery effluents and sludges / Richard Daniels in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 30-32 Titre : The effect of salinity on the the treatment of tannery effluents and sludges Type de document : texte imprimé Auteurs : Richard Daniels, Auteur Année de publication : 2005 Article en page(s) : p. 30-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eaux usées -- Epuration Salinité Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Note de contenu : - ANAEROBIC SYSTEMS : Anaerobic lagooning methods - The upflow anaerobic sludge blanket systems - The nitrification/denitrifiation process for removing nitrogen from tannery effluents - SALINITY AND ANAEROBIC METHODS OF TREATMENT : Literature studies - SALINITY AND AEROBIC METHODS OF TREATMENTS - BENEFITS FROM TREATING EFFLUENTS WITH LOW SALINITY VALUES En ligne : https://drive.google.com/file/d/1Zi1F-Pz5hovC-ayCTbebIqC1zlqB0Dhz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32495 [article]

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Modifying the skin structure / Richard Daniels in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 34 Titre : Modifying the skin structure Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Walter Landmann, Auteur Année de publication : 2005 Article en page(s) : p. 34 Langues : Anglais (eng) Catégories : Cuirs et peaux Peaux brutes -- Structure Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Before first time drying and the formation of a flat stable substrate, the conversion of hides and skins into leather can be viewed as two distinct stages. Note de contenu : - The removal of unwanted skin components - The location of specific materials within the collagen structure - The outcome of undected change - PanelE8/1 : Collagen fibre structure in butt and belly areas En ligne : https://drive.google.com/file/d/1WV1aFvxWMW_cHiBe-CmVDqex6IyUOcmK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32496 [article]

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Interactions : hides & skins, and mechanical forces / Richard Daniels in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 35 Titre : Interactions : hides & skins, and mechanical forces Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Walter Landmann, Auteur Année de publication : 2005 Article en page(s) : p. 35 Langues : Anglais (eng) Catégories : Contraintes (mécanique) Cuirs et peaux Traitement chimique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : It is appreciated that the role of the process vessel in leather manufacture is greater than that of a chemical reactor. While chemical reactions take place, considerable forces are applied to the goods undergoing process. The way that these forces are received, and the outcome—flexing, extension, compression and relaxation—strongly affects the chemical distribution within each hide or skin. Consequently, these physical interactions not only help achieve aesthetic qualities that can be attributed to good hide relaxation, but are significant within the development of the technical properties of the leather. Note de contenu : - Physical interactions between pieces and machines - When the outcome is non-predictable - Seeking normality - Shifts from normality En ligne : https://drive.google.com/file/d/1gXtTAjQvjIK6ujWaHtYq4EH0-0t1zSGj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32497 [article]

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Fleshing from back-breaking labour to throughfeed technology in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 37-46 Titre : Fleshing from back-breaking labour to throughfeed technology Type de document : texte imprimé Année de publication : 2005 Article en page(s) : p. 37-46 Langues : Anglais (eng) Catégories : Cuirs et peaux -- Appareils et matériels Index. décimale : 675 Technologie du cuir et de la fourrure Note de contenu : - Fig. 1 : Manual fleshing on beams (Netherlands Natinal Library) - Fig. 2 : Fleshing in a multi-roller fleshing machine - Fig. 3 : Spiral blades of a fleshing cylinder overlap in the centre - Fig. 4 : Hydraulic actuator for transport roller on a Poletto flesher - Fig. 5 : Conventional whole hide flesher mounted on a steel gantry - Fig. 6 : TreP 'Pirana' throughfeed fleshing machine for whole hides - Fig. 7 : Outfeed side of persico machine with diverter conveyor (Pittards plc) En ligne : https://drive.google.com/file/d/1o30AiJIQ7-N_u24Yhj6lEaM5o_5cXRz2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32498 [article]

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