Soaking of hides and skins

Back to Subsection DC leather

General description

Soaking is carried out to allow hides and skins to reabsorb any water which may have been lost after flaying, in the curing process, or during transport. Soaking also cleans the hides and skins (removal of dung, blood, dirt, etc.) and removes interfibrillary material. The soaking methods used depend on the state of the hides. The process is mostly carried out in two steps: a dirt soak to remove the salt and dirt, and a main soak. The duration of soaking can range from several hours to a few days. Putrefying bacteria can thrive during soaking and biocides may be added to curtail their activity. Depending on the type of raw materials being soaked, other additives may be used, such as surfactants and enzyme preparations.

Typical process parameters

Process	Temperature [°C]	Heat transfer medium	Residence time	Details	Literature
Soaking	28 °C	water and chemicals	continious		BASF. (2007). Pocket book for the leather technologist (4. Auflage).

Source: Joint Research Centre, Best Available Techniques (BAT) Reference Document for the Tanning of Hides and Skins, 2013

Back to Subsection DC leather