| Titre : |
Some properties of wet-blue leathers produced from recycled chrome tanning liquors |
| Type de document : |
texte imprimé |
| Auteurs : |
John R. Barlow, Auteur ; S. W. Ip, Auteur |
| Année de publication : |
1977 |
| Article en page(s) : |
p. 29-33 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Chrome -- Recyclage
Couleur
Produits chimiques -- Consommation -- Réduction
Résistance à la déchirure
Résistance à la traction
Tannage au chrome
Température de retrait
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
A simple recycling system was used in the preparation of wet-blue leathers, with the residual chrome tanning liquor being replenished with acid and salt before being used for pickling the next batch of bated hide. Chrome tanning powder was added to the liquor on completion of pickling, to give a total offer of the required amount, with the wet blues thus produced being compared to those prepared by a conventional process. Two series of experiments were carried out to give either "low chrome" (1.8 % Cr203, dry weight basis) or "normal chrome" (2.5 % Cr203) wet blues. Within each series, the initial properties and storage behaviour were unaffected by the use of recycled, rather than fresh, chrome tanning liquors. Low chrome and normal chrome samples displayed similar stability under the storage conditions used, with neither set showing deterioration of the measured properties after the prescribed holding time. Colour measurements on the wet-blues before and after storage showed that the leathers from recycled liquors did not undergo changes greater than those of the control samples, and that between-batch colour differences should not be a problem in practical application. Wastage of chrome tanning salt, and hence concentration of chrome in the effluent, was reduced by approximately 90 % by recycling the residual tanning liquor, rather than discarding it as in a normal process. Overall consumption of chrome tanning salt was reduced by 13 (low chrome series) and by 24% (normal chrome series) compared to that of similar, conventional processes. |
| Note de contenu : |
- INTRODUCTION : 1. Storage behaviour - 2. Initial colour and between-batch colour vriation
- METHODS : Starting material
- TESTING OF WET-BLUES : Shrinkage temperature - Tensile strength and tear strength - Colour
- RESULTS : a) Effects of recycling on initial properties of wet-blues and on chemical consumption during processing - b) Change in properties of wet-blues during storage - c) The effect of recycling on the colour of wet-blues - d) Comparison of low chrome with normal chrome
- Fig. 1 : Processing schedule
- Table 1 : Some chemical and physical properties of wet-blue leathers methods
- Table 2 : Chemical consumption-comparison of standard and recycling
- Table 3 : Percentage changes in the value of some properties of wet-blues after three months' storage
- Table 4 : Colour of leathers from recycled liquors, compared to that of leathers from control process
- Table 5 : Savings in chrome tanning Salts (£/annum) by recycling liquors, assuming 20% reduction in usage |
| En ligne : |
https://drive.google.com/file/d/1IQRJ-9WYI38akuFUe8kWH_9V0PgrIyuE/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34118 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 61, N° 2 (03-04/1977) . - p. 29-33
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Some properties of wet-blue leathers produced from recycled chrome tanning liquors in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61, N° 2 (03-04/1977)
