A new concept of pretanning without chrome / Marcel Siegler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIV (Année 1979)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXIV (Année 1979) . - p. 288-300 Titre : A new concept of pretanning without chrome Type de document : texte imprimé Auteurs : Marcel Siegler, Auteur Année de publication : 1979 Article en page(s) : p. 288-300 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chaux 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 physiques Fleur du cuir Prétannage sans chrome Refente sur chaux Stratigraphie Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The manufacture of grain and split leather is simplified by pretanning cattle hides, either after bating or during pickling, with a chromium-free tanning agent until the shrinkage temperature reaches between 170° and 185°F. The pretanned hide is then split to provide a grain and a split intermediate, then these components are shaved and tanned. The entire hide treatment sequence can be effected in two stages : first, beaming, lime fleshing (if necessary), bating, and pretanning before or during pickling ; second, wringing, splitting, sorting, and shaving. The tanning is done after shaving in the the second stage and is followed by coloring and fatliquoring. The resulting chrome-tanned leather has very good physical properties, good fullness, and produces a higher area yield. The pretanned splits can be sorted and shaved for different types of leather, such as vegetable tan, chrome-vegetable tan, etc., and thus be increased in their value. The shavings contain no chromium and very littls salt. Hence they have many moreuses, or they can be disposed of by dumping without significant environmental impact. Much less chrome is needed to tan the leather because the tanning chemicals are used only on the shaved weight. Also, there is less spent chrome to be recycled and reused. The spent liquor can be used either as the float for a new batch of grains or for tanning the splits. Note de contenu : - Table 1 : Shrinkage temperatures at various stages of pretanning process - Table 2 : Take-up of the pretanning product with time of tanning - Table 3 : Chrome distribution by stratigraphic test regular tanning process - Split in blue versus seton special process (SSP) - Table 4 : Comparison of the physical properties of crust leathers derived from hides processed by lime splitting,blue splitting, and the SSP pretanning process - SSP pretanning procedure on regular delimed stock - SSP pretanning procedure on completely delimed stock - Tanning procedure for the grains - Physical properties of SSP leathers En ligne : https://drive.google.com/file/d/1ww_q_dWcvIGk6Usu7pBqWdiTGV_Undii/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37222 [article]

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