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Ajouter le résultat dans votre panierLiricure-powder biocide composition for hide and skin preservation / Alan E. Russell in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 4 (07-08/1997)
Titre : Liricure-powder biocide composition for hide and skin preservation Type de document : texte imprimé Auteurs : Alan E. Russell, Auteur ; R. Kohl, Auteur ; H. Tandt, Auteur Année de publication : 1997 Article en page(s) : p. 137-142 Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Environmental concerns, process efficiency and economy are interrelated factors driving technological innovation in the leather industry. In a water-scarce country like South Africa in particular, it has been necessary to explore alternative clean preservation options to conventional salt curing.
Introduction of antiseptic preservation (or "chemical curing") in the 1980s served to provide the industry with a short-term preservation option and reduced dependence on salt forlocal hide holding and transportation. Alternatives to this approach were the chilling of cattlehides (with or without biocide addition) or direct processing of green hides to wet-blue leather, wherever possible.
The need for a comparable "salt-free" preservation method for sheepskins has led to the investigation of direct application of powder preservative compositions to the flesh side of freshly-flayed skins. Undesirable wetting of the wool cover, inherent in other antiseptic methods, was thereby avoided. It avoided. It was found that substantial storage periods were possible by application of a range of antiseptic (organic/inorganic) powder extender mixtures uniforly distributed over the moist flesh surface (approx. 200 g per skin), followded by folding flesh-to-flesh to maintain close contact with the applied preservative composition. Storage/dosage studies at a controlled temperature (25°C) showed a progressive increase in storage time. Application of selected compositions in field storage trials on gloving skins yielded pickled pelt and crust leather quality comparable with normal production after 6 weeks ambient storage.
Extension of the application method to cattlehide necessitated an increase in the application dosage to physically cover the larger hide area (approx. 3 kg per hide) ; treated hides were "saddle-stacked" to maintain contact of the preservative composition with both sides of each hide.
A total of six production hide (winter/summer) storage/transportation trials has been completed using the LIRICURE method over sotrage periods ranging from 1 to 2.5 weeks. The resultant wet-blue and crust auto and shoe upper leather had properties and quality comparable with normal production. Examination of the salt (ash) and moisture contents in Liricure treated stock indicated that substantial reductions in salt usage (approximately ten-fold decrease) were achieved compared with conventional salt curing. The method has been registered as a joint (LIRI Technologies/Meat Board) South African Patent (February, 1995).
The enhanced preservative effect in the Liricure method is attributed to one or more of the following factors :
(a) Initial introduction of high antiseptic concentration in the surface moisture of the skin (or hide) in excess of minimum inhibitory requirements ;
(b) Partial reduction in natural skin moisture due to osmotic effects, thereby removing available water necessary for bacterial growth and development ;
(c) Reduction in water activity in residual skin moisture due to dissolution of solutes (antiseptic, salts), thereby further inhibiting bacterial growth ;
(d) Increase in skin stability in the presence of dissolved salts, rendering it resistant to bacterial enzyme action ;
(e) Shifts in skin surface pH on dissolution of solutes (whether acidic or alkaline) further inhibiting bacterial growth.En ligne : https://drive.google.com/file/d/1kLwssHFus1pjNEx_FSPVKEZCFh9KyXz5/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8013
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 4 (07-08/1997) . - p. 137-142[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007017 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Adsorption of chromium (III) from a tanning wastewater on kaolinite Type de document : texte imprimé Auteurs : E. L. Talvani, Auteur ; C. Volzone, Auteur Année de publication : 1997 Article en page(s) : p. 143-148 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The adsorption of chromium (III) from a tanning wastewater on a kaolinite was studied. Simultaneously, adsorptions of sodium, of chloride and of sulphate were analysed. Tests were carried out using solutions with a chromium (III) content ranging between 0.62-38.27 mmol/L. These solutions were prepared by dilution of the original wastewater without changing the ration of their constituents. The solutions before each adsorption test and the equilibrium solutions were characterised by chemical analysis, by X-ray diffraction, by scanning electron microscopy and by surface chemical analysis using an electron microprobe. The results obtained permitted us to determine the principal physico-chemical aspects of the adsorption of chromium (III) on kaolinite. Monomeric and polymeric species of chromium (III) were detected in the tannin gwastewater and in each of the solutions prepared from the original wastewater. The adsorption of chromium (III) rose steeply at low equilibrium concentrations and showed negligible changes at high equilibrium concentrations. The maximum chromium (III) adsorption determined was 0.108 meq/g of kaolinite over the concentration range studied. The Langmuir equation was used to quantify the chromium (III) adsorption. It was determined that d(001) spacing and crystal size of kaolinite changed with the chromium content, whereas, the changes of clay texture were minimal after each adsorption. Finally, it was established that the presence of chromium (III) was not homogeneous in the kaolinite bulk. En ligne : https://drive.google.com/file/d/1slEIL98qUe-wAk_rrZHskAPKfQc8kXWe/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8021
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 4 (07-08/1997) . - p. 143-148[article]Réservation
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Titre : Identification of additional peaks observed during the GC-MS analysis of arylamines relusting from the reductive cleavage of azo dyestuffs Type de document : texte imprimé Auteurs : D. Muralidharan, Auteur Année de publication : 1997 Article en page(s) : p. 149-151 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : During the course of our studies on the detection and determination of arylamines from azo dyestuffs by GC-MS, two additional peaks with m/z 256 and 279 amu respectively were observed. The peaks were identified as due to sulphur formed from sodium ditionite used for the reductive cleavage of the azo groups and from dioctyl phthalate, a contaminant of the chromatographic system. Even though these compounds do not undergo fragmentation to produce ions having masses identical with that of the 20 aryl amines forbidden by the German Government, co-elution of these compounds with any of the arylamines in question will result in complex mass spectra possibly leading to unreliable analytical reports. En ligne : https://drive.google.com/file/d/1348RmkzWGTLPuAoed-P85oXPWf_FXcTM/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8022
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 4 (07-08/1997) . - p. 149-151[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007017 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Studies of the bending behaviour of chrome tanned leather Type de document : texte imprimé Auteurs : W. Yu, Auteur ; Geoffrey E. Attenburrow, Auteur Année de publication : 1997 Article en page(s) : p. 152-155 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Three-point bend test methodology has been applied tocharacterise and investigate the bending behaviour of chrome tanned leather. Of particular interest has been the influence of thickness on the force required to bend the leather by a given amount. Results are presented for crust leather before and after staking as well as for finished leather. For each type of leather it was found that the form of the bending force-thickness relationship departed from the expectation of the standard theory of bending. It is shown that these discrepancies may be acciybted for by using a modified theory which incorporates differentes stiffness values for grain and corium layers. En ligne : https://drive.google.com/file/d/1PgZMZDJ4axQBeH7thC4kQ_ESrfqAGuZn/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8023
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 4 (07-08/1997) . - p. 152-155[article]Réservation
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Titre : Drying of raw goat and sheepskins by heat pump : an alternative to salting Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; E. Gratacos, Auteur ; M. Portavella, Auteur Année de publication : 1997 Article en page(s) : p. 156-159 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In wet countries, the curing of raw woolskins is carried out by salting however, this method causes problems to the tanners given the high salt content in the soaking effluents. In order to avoid this salinity problem, the curing of woolskins by drying is preferred. But in countries where climatic conditions are not adequate, hot air drying can be used, which may cause irreversible damage to the skins.
In this paper, laboratory drying trials on raw woolskin at different temperatures are reported to demonstrate the damage arising from inadequate drying conditions. In additions, some recommendations on the most suitable drying conditions are offered. Briefly, drying must be carried out under the following conditions :
. Well stretched out skins with the flesh side outwards
. Gentle air flow, at no more than 20°C, at low relative humidity.
These conditions which are rarely supplied by the climate in many countries can be easily achieved by means of a heat pump dryer.
The results of a semi-industrial drying trial on raw wollskin in a pilot plant operated by a heatpump are reported. Satisfactory drying was achieved in 20 hours using air at a temperature between 28-22°C and a relative humidity of 30-40 %.En ligne : https://drive.google.com/file/d/11m5Fao05AffbB69nqvWFfznwWB_FAnyt/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8024
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 4 (07-08/1997) . - p. 156-159[article]Réservation
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Titre : A new approach to the synthesis and formulation of 2-(thiocyanomethylthio)-benzothiazole Type de document : texte imprimé Auteurs : L. Muthusubramanian, Auteur ; R. B. Mitra, Auteur ; V. S. Sundara Rao, Auteur ; T. Ramaswamy, Auteur Année de publication : 1997 Article en page(s) : p. 160-161 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Previously fungal attack in the leather industry has been prevented by using pentachlorophenol, but its use is no longer acceptable due to the possibility of the formation of chlorinated dibenzodioxine a poisonous compound. 2-(Thiocyanomethyltio)-benzothiazole (TCMTC), which is a currently used replacement is insoluble in water, and therefore has to be applied as an emulsion to wet blue leather.
This paper reports on the synthesis and formulation of TCMTB. The synthesis of TCMTB is characterised by infrared spectroscopy, nuclear magnetic resonance and by mass spectrometry.En ligne : https://drive.google.com/file/d/1stV8VMKelb6rKgAGnMDjy_98Nfn_AOQ7/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8025
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 4 (07-08/1997) . - p. 160-161[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007017 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Dyeing of compact tanned skins Type de document : texte imprimé Auteurs : Anita Przepiórkowska, Auteur Année de publication : 1997 Article en page(s) : p. 162-169 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : For several years we have been working on the application of tanning preparations which have a full fatliquoring effect on leather. The studies preformed confirm that during thereaction of chrome (III°with sulphoxidated waste pig fat in the ethylene glycol medium, complexed compouds of chrome with fats or their derivatives are formed. The presence of such complexes in the tanning/fatliquoring preparations facilitate the penetration of the preparation into the skin and, at the same time, its binding with the collagen network compounds regulates the fibre cohesion.
Chemical bonds between the skin proteins and the fatliquoring compounds give the skins specific properties such as fastness to washing and to organic solvent (dry cleaning).
The substances introduced into the skin during the compact tanning process may influence the dyeing properties of the manufactured leather. The purpose of the present study was the assessment of the dyeing properties of the skins tanned with the tanning fatliquoring preparations containing chrome III.En ligne : https://drive.google.com/file/d/1UbN0rhqEW1eUUsdvUDEoSMh-xC8P0FRR/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8026
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 4 (07-08/1997) . - p. 162-169[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007017 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Oil tannage for improved utilization of internal bovine stomach membranes Type de document : texte imprimé Auteurs : M. S. Khan, Auteur Année de publication : 1997 Article en page(s) : p. 170-172 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Internal bovine stomachs membrane is a by-product form the slaughter house.
Quality exotic chamois leather with a grain : a different variety from an ordinary velvety chamois may be obtained if the membranes, after preliminary beamhouse operations, are pickled and pre-tanned with formalin or glutaraldehyde, followed by a cod oil tannage.
The leather was soft, stretchy (50-65.8 % elongation at break), with rapid water absorption, lightweight, yellow/light brown colour with an adequate thickness (0.7-1.4 mm) and shrinkage temperature (Ts61°C-68°C). However the water absorption was limited due to the lower porosity of the typical fibres of the membranes.
The leather processed from this non-conventional source has been found suitable for manufacturing fancy small leather goods like ladies handbags, purses wallets, and also for covering handles of tennis racquets and hockey sticks.En ligne : https://drive.google.com/file/d/1bMHqbAngLOvVtbljIG0-x0VqRJrzA63s/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8027
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 4 (07-08/1997) . - p. 170-172[article]Réservation
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| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| 007017 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |
