[article]
| Titre : |
The use of ambient temperatures in the liritan sole leather system |
| Type de document : |
texte imprimé |
| Auteurs : |
David A. Boast, Auteur ; Stanley G. Shuttleworth, Auteur ; Desmond R. Cooper, Auteur |
| Année de publication : |
1987 |
| Article en page(s) : |
p. 242-252 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Résumé : |
Pilot plant studies have been carried out on the use of the LIRITAN "Flip Flop" sole leather system with mimosa extract at ambient temperatures. The temperature of the small experimental tanks (circular pits) made from plastic was controlled solely by climatic conditions over the 26 week period of assessment, with the ambient temperature varying mainly in the region of 16° to 27°C in the summer months of this experiment. The variation of temperature in the circulation tanks was much less than this as these were insulated. In the case of commercial production in large pits there would be more of a heat-sink and the temperature variations would be less severe. This work was done to try to produce acceptable leather in tanneries which lack adequate heating facilities for a warm circulator system, thus extending the area of use of the LIRITAN system and cutting costs. One of the advantages of a warm circulator system is that the sludge formation is reduced. In this trial the accumulation of sludge at the lower temperatures has been overcome by the use of a dispersing sytan (PELLUTAX 64 – HENKEL).
Using the established warm (35°C) circulator LIRITAN system, 8 days was found to be sufficient for a satisfactory degree of tannage, using a tan liquor of 118° Barkometer (15.5° Baumé). In this trial the tannage time has been extended to two weeks with the tan strength maintained at 118° Barkometer, in order to obtain the same degree of tannage as the 8 day warm circulator system.
As a mean of comparison, each piece of leather was halved after the initial 2 weeks ambient temperature tannage. One half was processed directly after the ambient tannage and the other half was given an additional tannage by hot pitting at 40°C and 140° Barkometer (18° Baumé) for 4 days.
The results indicate that satisfactory sole leather can be produced in a two week ambient tannage, but that the addition of a 4 day hot pit system improved the degree of tannage, increased the density and reduced the water absorption. Whether the additional advantages conferred by the hot pitting is worth the extra effort, time, cost and installation of a limited heating system would have to be determined by each individual tanner. |
| En ligne : |
https://drive.google.com/file/d/1Wx9Uq4kw6kkINlYyqFGB_GLOw0-2PQbH/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9036 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXII (Année 1987) . - p. 242-252
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The use of ambient temperatures in the liritan sole leather system in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)
