| Résumé : |
In spite of the considerable progress made in the technical development of leather manufacture, there are still many problems as far as liming and tanning are concerned. Labor is hard and dirty for the worker. Therefore, tanners are working in one drum or mixer, from soaking to chrome tannage, without changing the vessel. The tanner bypasses mechanical treatment, such as fleshing, splitting, and cleaning the grain side, although even today these processes are of great importance and should be placed after liming, where they are there better situated than in soaking or after chrome tannage.
However, the beamhouse processes create the most problems with respect to the effluent. This contains large amounts of proteins, sulfide, and lime, and the volume is still very large today.
I would like to present to you a process which has been published in an initial form in JALCA in the December, 1973, issue. In the meantime, some improvements have been made.
The process can be divided into three parts. The first part is a painting step from the hair side, performed in the manner of a conveyer belt process, and lasting 1/2 hour. The second part is a treatment with ten percent sodium peroxide solution to open up the hide structure. It takes one hour. This treatment is stopped by neutralization with acid. The third part covers the following processes : fleshing, splitting, pickling, and chrome tanning. |
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A very rapid liming and tanning process in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
