Process for finishing animal hides or pelts

C - Chemistry – Metallurgy – 14 – C

Patent

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C14C 1/04 (2006.01) C14C 3/00 (2006.01) C14C 9/02 (2006.01)

Patent

CA 2214446

In order to make processes for finishing animal hides or pelts less labor-intensive and more environmentally compatible, a process is proposed in which, following a conventionally conducted soak, the animal hides or pelts are treated with a conventional tanning solution in which carbon dioxide has been dissolved under pressure. This makes it possible to reduce considerably the period of time usually required for the production of leather or pelts, since the treatment period is reduced markedly. Furthermore, it is possible in this way to combine conventional treatment steps and to conduct them in only one single treatment step. Instead of the 20 to 40 t of waste water per tonne of leather or pelt which are customary with conventional processes, only about 2 t of waste water per tonne of leather or pelt are now produced. Besides having a sharply reduced environmental impact, the proposed process is also significantly more economic than conventional processes, owing to the considerably shorter overall processing time.

Afin d'obtenir un procédé de préparation de peaux ou de fourrures animales moins laborieux et plus respectant mieux l'environnement, on traite les peaux ou les fourrures animales après une trempe classique dans une solution classique de tannage dans laquelle du dioxyde de carbone est dissous sous pression. On peut ainsi réduire considérablement le temps habituellement nécessaire pour obtenir des cuirs ou des fourrures, étant donné que leur durée de traitement est sensiblement réduite. On peut en outre de cette façon réunir plusieurs étapes classiques de traitement en une seule étape de traitement. Au lieu des 20 à 40 tonnes d'eaux usées habituellement produites par tonne de cuir ou de peaux dans les procédés classiques, seulement 2 tonnes environ d'eaux usées sont produites par tonne de cuir ou de peaux. Ce procédé a non seulement un impact sensiblement réduit sur l'environnement, par rapport aux procédés classiques, mais il est aussi beaucoup plus économique, compte tenu de la réduction considérable de la durée totale de traitement.

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