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A novel pickle-free high exhaust chrome tanning method-an appproach for tota dissolved solids management / Victor John Sundar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)
[article]
Titre : A novel pickle-free high exhaust chrome tanning method-an appproach for tota dissolved solids management Type de document : texte imprimé Auteurs : Victor John Sundar, Auteur ; T. Rangasamy, Auteur ; Venkatasubramanian Sivakumar, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2004 Article en page(s) : p. 252-255 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome trivalent -- Absorption
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuirs et peaux -- Propriétés organoleptiques
Déchets -- Réduction
Eaux usées -- Analyse
Tannage au chrome
Température de retrait
Totaux solides dissousLe total des solides dissous (TDS) est une mesure de la teneur combinée dissoute de toutes les substances inorganiques et organiques présentes dans un liquide sous forme moléculaire , ionisée ou microgranulaire (sol colloïdal) en suspension. Les TDS sont souvent mesurés en parties par million (ppm). Le TDS dans l'eau peut être mesuré à l'aide d'un compteur numérique. (Wikipedia)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Serious environmental concerns are being raised with respect to at high Total Dissolved Solids (TDS) contents in spent leather processing liquors. Pickling alone contributes about 35% TDS in the effluents. As cost effective treatments for TDS are not yet available, in-plant control has become a necessity. In the present work, a picklefree chrome tanning method has been coupled with in-situ neutralisation of acid generated during the hydrolysis of chrome salts. The elimination of pickling has given a significant reduction in TDS. Higher uptake and more uniform distribution of chromium in the leather are other benefits of the process. Chemical, physical and microscopical analyses indicate that the leathers’ properties are comparable with those of conventionally processed leathers. It is believed that this new approach could be gainfully employed to overcome the twin concerns of TDS and chromium in the effluent. Note de contenu : - MATERIALS AND METHODS
- PROCESS DETAILS : (All chemical offers are based on the fleshed weight) - Spent liquor analysis - Scanning Electron Microscopic (SEM) examination - Strength properties - Organoleptic properties - Colour value of dyed crust leathers
- RESULTS AND DISCUSSION : Spent tan liquor analysis - Shrinkage temperature and stratigraphic chromium distribution - Scanning Electron Microscopic (SEM) examination - Strength and Organoleptic functional property analysis - Colour value of dyed crust leathers
- Table 1 : Spent tan liquor analysis
- Table 2 : Analysis of wet-blue leathers
- Table 3 : Physical test characteristics of dyed crust leathers
- Table 4 : Organoleptic properties of wet-blue leathers
- Table 5 : Organoleptic properties of dyed crust leathers
- Table 6 : Colour values of dyed crust leather from reflectance measurementsEn ligne : https://drive.google.com/file/d/1QCx2Dhko62huH-NXEDagMdsX0l72qZy6/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39619
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 6 (11-12/2004) . - p. 252-255[article]A novel pre-tanning agent for high exhaustion chromium tannage / Luan Shifang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 4 (07-08/2007)
[article]
Titre : A novel pre-tanning agent for high exhaustion chromium tannage Type de document : texte imprimé Auteurs : Luan Shifang, Auteur ; Liu Yan, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur ; Duan Zhenji, Auteur Année de publication : 2007 Article en page(s) : p. 149-153 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Agents de tannage
Cuirs et peaux -- Propriétés physiques
Epuisement des tanins
Groupement carboxyle
Oxazolidine
Prétannage
Tannage au chrome
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A pre-tanning agent (OXD) which contains carboxyl, hydroxyl and tetra-amino groups was synthesized and applied in high exhaustion chrome tannage. This pre-tanning agent is able to react with the pendent amino groups of collagen and thus improves the hydrothermal stability when the additional carboxyl, hydroxyl and amino groups are introduced into the backbone of collagen. In the tanning process, the introduced carboxyl groups and the intrinsic carboxyl groups themselves of collagen coordinate with chromium and form uni- or multi-point bound chromium complexes, which seems to contribute to the final leather’s excellent chromium combination fastness and high chrome exhaustion. In a practical tannage, hide or skin pre-tanned with 2wt% OXD-I followed by a traditional chromium tannage, the absorption of chromium increased from 70.6% to 96.5%, and the content of Cr2O3 in the wastewater decreased from 1.76g/L to 0.16g/L. The shrinkage temperature of the leather also shifted from 104°C to 114°C. In a comparison with traditional chromium tannage, leathers pretreated with OXD followed by a chromium tannage showed good fullness and higher area yield as well as higher chromium combination fastness. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and instruments - Tannage - Interaction between OXD and collagen - Coordination between OXD and chromium - Determination of the chromium combination fastness in leather - Physical properties of leather
- RESULTS AND DISCUSSION : Interaction between OXD-I and collagen - Co-ordination reaction between OXD-I and chromium - Effects of carboxyl groups of OXD on the exhaustion of chromium - Optimization techniques for OXD-I - Chromium combination fastness in leathers
- Table 1 : Effects of carboxyl groups of OXD on absorption of chrome and shrinkage temperature of leather
- Table 2 : Effect of OXD-I used as a pretannage and as a retannage on the exhaustion of chrome and leather performance
- Table 3 : Effect of dosage of OXD-I pretannage on exhaustion of chrome and Ts of leatherEn ligne : https://drive.google.com/file/d/1Pkwv8zNmUM_M4uObdG0xZ4XdcXtI3Yci/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39020
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 4 (07-08/2007) . - p. 149-153[article]On the shrinkage kinetic of collagen / Guillermo O. Sarli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60, N° 4 (07-08/1976)
[article]
Titre : On the shrinkage kinetic of collagen Type de document : texte imprimé Auteurs : Guillermo O. Sarli, Auteur ; J. Raul Grigera, Auteur Année de publication : 1976 Article en page(s) : p. 113-117 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène -- Stabilité
Température de retraitIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The shrinkage kinetic of collagen was first used by Weiri to measure the activation enthalpy and entropy of the fibre-random coil transition of collagen.
The early results shown a relative simple kinetic, characterised by a single parameter, namely the half time of the process. Later on, a more sophisticated inter-pretation of the kinetic was suggested. The curves shown in these works are very simple.
The stability of collagen fibres is widely measured by means of the shrinkage temperature. This parameter is very easy to measure and, if the process is as simple as was described, it may well characterise the transition with enough accuracy. It is probable that on this account there have not been many new works published on shrinkage kinetic.
However, by using a more refined measuring method to follow the shrinkage kinetic, we can show that the denaturation of collagen fibres is a process too complex to be characterised by the shrinkage temperature.
The present note is intended to give some details of the measuring technique.Note de contenu : - Fig. 1 : Diagram of the apparatus
- Fig. 2(a) : Shrinkage kinetic of rat tail tendon hydrated 24h in bidistilled water. (a) Shrunk in water
- Fig. 2(b) : Shrunk in aqueous solution of dioxane 4.100 molal.En ligne : https://drive.google.com/file/d/1NBQSXEFcgv_cWRfShkCnoB3elCrpObb0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34116
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60, N° 4 (07-08/1976) . - p. 113-117[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007107 - Périodique Bibliothèque principale Documentaires Disponible On the shrinkage kinetic of collagen / Guillermo O. Sarli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)
[article]
Titre : On the shrinkage kinetic of collagen Type de document : texte imprimé Auteurs : Guillermo O. Sarli, Auteur ; J. Raùl Grigera, Auteur Année de publication : 1976 Article en page(s) : p. 113-114 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène
Cuirs et peaux
Température de retrait
ThermocinétiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The shrinkage kinetic of collagen was first used by Weirl to measure the activation enthalpy and entropy of the fibre-random coil transition of collagen.
The early results shown a relative simple kinetic, characterised by a single parameter, namely the half time of the process. Later on, a more sophisticated intepretation of the kinetic was suggested. The curves shown in these works are very simple.
The stability of collagen fibres is widely measured by means of the shrinkage temperature. This parameter is very easy to measure and, if the process is as simple as was described, it may well characterise the transition with enough accuracy. It is probable that on this account there have not been many new works published on shrinkage kinetic.Note de contenu : - Fig. 1 : Diagram of the apparatus
- Fig. 2a : Shrinkage kinetic of rat tail tendon hydrated 24 h in distilled water, a) Shrunk inwater
- Fig. 2b : Shrunk in aqueous solution of dioxane 4:11 molal.En ligne : https://drive.google.com/file/d/1NBQSXEFcgv_cWRfShkCnoB3elCrpObb0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35261
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 113-114[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008596 - Périodique Archives Documentaires Exclu du prêt Oxidising degradation of Valonia extract and utilisation of the products. Part 2. Combination tannages of degraded product using 10% H2O2 with Cr(III) and AI(III) / Bi Shi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 1 (01-02/2001)
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Titre : Oxidising degradation of Valonia extract and utilisation of the products. Part 2. Combination tannages of degraded product using 10% H2O2 with Cr(III) and AI(III) Type de document : texte imprimé Auteurs : Bi Shi, Auteur ; Ying Di, Auteur ; Lijiang Song, Auteur Année de publication : 2001 Article en page(s) : p. 19-23 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Chrome
Cuirs et peaux -- Propriétés physiques
Liqueurs de tannage -- Analyse
Oxydation
Résistance à la transpiration
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium
Tannage végétal
Température de retrait
Valonia et constituantsValonia est un genre d'algues vertes de la famille des Valoniaceae. La taille d'une seule cellule pluri-nucléée peut atteindre 2 cm chez certaines espèces. (Wikipedia)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Trials described in this paper showed that Perval-10, the oxidised degradation product of valonia extract using 10 % H2O2(w/w), had a synergistic effect with Cr(III). The combination tannages using 5 7 % Perval-10 and 1.0-1.5 % Cr2O3 produced leather with shrinkage temperatures above 100°C, higher than that of the corresponding chrome tannage and a combination tannage using 15 % valonia extract. The synergistic reaction of Perval-10 and Al(III) was not as effective as with Cr(III), but still produced leather with a shrinkage temperature above 100°C, when 7 % Perval-10 was used. The tanning sequence in combination tannages using Perval-10 is not critical, perhaps due to its moderate astringency and rapid penetration rate. The vegetable tanned characterer of leathers tanned by combination tannages using Perval-10 was largely eliminated, so that the tannages are suitable for producint quality leathers similar to a chrome tannage. Note de contenu : - EXPERIMENTAL PROCEDURES : 1) Vegetable-Cr (III) combination tannage - 2) Cr(III)-vegetable combination tannage - 3) Vegetable-Al(III) combination tannage
- DETERMINATIONS OF Cr2O3 CONTENTS IN SPENT TANNING LIQUORS AND PHYSICAL PROPERTIES OF LEATHERS
- RESULTS AND DISCUSSION :
- Table 1 : Shrinkage temperature ( C) of leather in vegetable compound-Cr(III) combination tannage
- Table 2 : Filling property (%) and grain feature of oxidised valonia-Cr(lll) combination tannage
- Table 3 : Shrinkage temperature ( C) of leather in Cr( III )-Perval-10 combination tannage
- Table 4 : Filling property (%) and features of leather in Cr(lll)-Perval-10 combination tannage
- Table 5 : Contents (g/l) of Cr2O3 in waste float of combination tannage
- Table 6 : Physical properties of leathers of combination tannages
- Table 7 : Perspiration resistance of leathers of combination tannages
- Table 8 : Shrinkage temperature ( C) of tannin compound-AI(III) combination tannageEn ligne : https://drive.google.com/file/d/1eWaszcdmTeLeVu8OO7t-FeQ5vT9I-HJG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40590
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 1 (01-02/2001) . - p. 19-23[article]Oxidizing degradation of Valonia extract and utilization of the products - Part 3 : Auxiliary tanning effects of degraded producs using 20% and 30% H202 / Ying Di in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 5 (09-10/2001)
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PermalinkPerformance evaluation of hybrid formulations consisting of antioxidant and crosslinking agents for the treatment of acid degradation in historic vegetable-tanned leathers / Alireza Koochakzaei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 8 (08/2022)
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PermalinkPreparation and application of vinyl polymer-mmt nano tanning agent / Ma Jianzhong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 5 (09-10/2005)
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PermalinkPretreatment with condensate of glyoxal and n-thioureidopyromellitamic acid for a stable aluminium tannage / Hongru Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 4 (07-08/2004)
PermalinkQualité du cuir obtenu à partir de peaux brutes n'ayant pas subi de traitement de conservation / Wiktor Pietrzykowski in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXIV (Année 1972)
PermalinkSalinity reduction in the production of nappa skins by using agents with non-swelling capacity in pickling/tanning / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 6 (11-12/2005)
PermalinkSalt free preservation of raw goat skin using swietenia mahogany (seed) extract / Md. Abdur Razzaq in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 2 (02/2022)
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