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Machine translation
1. (WO1979000712) METHOD OF TANNING RAWHIDE
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1979/000712    International Application No.:    PCT/JP1979/000041
Publication Date: 04.10.1979 International Filing Date: 21.02.1979
IPC:
C14C 1/08 (2006.01), C14C 3/06 (2006.01)
Applicants:
Inventors:
Priority Data:
78/20517 23.02.1978 JP
Title (EN) METHOD OF TANNING RAWHIDE
(FR) METHODE DE TANNAGE DE PEAUX VERTES
Abstract: front page image
(EN)A method of tanning rawhide by pickling the rawhide after the preparatory operation has been finished, and then treating the pickled rawhide with chromium salt to thereby prepare leather. According to this invention, the pickling process is performed in the presence of urotropin (hexamethylene tetramine), whereby the pH value in a tanning bath of chromium salt may be easily adjusted, the coupling of rawhide with basic complex salt of chromium may be increased, and the amount of the residual chromium in the waste liquid may be minimized. Further, in order to improve the operation efficiency in the finishing step, to further enhance the quality of the leather, and to render the chromium content in the waste liquid almost zero, the tanned leather is treated with ammonia or weakly acidic ammonium salt in the used chromium bath.
(FR)Methode de tannage de peaux vertes consistant a mettre en jusee les peaux vertes une fois la phase preparatoire terminee, puis a traiter les peaux vertes en jusee avec un sel de chrome pour preparer ainsi le cuir. Selon l"invention, le procede de mise en jusee a lieu en presence d"urotropine (tetramine d"hexamethylene), ce qui permet d"ajuster facilement la valeur du pH dans un bain de tannage de sel de chrome, d"ameliorer le couplage entre les peaux vertes et un sel complexe basique de chrome, et de reduire au minimum la quantite de chrome residuel dans le liquide perdu. De plus, de maniere a augmenter l"efficacite dans la phase finale, a ameliorer Ia qualite du cuir et a ramener la teneur en chrome dans le liquide perdu presque a zero, le cuir tanne est traite avec de l"ammoniaque ou un sel d"ammonium faiblement acide dans le bain de chrome utilise.
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)