Community Research and Development Information Service - CORDIS

Chemical preparation of the hides for mechanical dehairing using traditional chemical agents, amines/mercaptanes, reducing chemical agents, enzyme/other agents

Several chemical agents have been studied to perform the hair loosening in order to prepare the hides for the mechanical dehairing.
Sodium sulphide and sodium sulphydrate are the reducing agents more efficiency. Working with small quantities of NaHS (0.3-0.4%) and NaOH (0.7-0.9%), in relatively short times, good hair loosening results were obtained. However, the resulting hides are not totally clean.
Besides, good results for the wet-salted as well as the hair dried hides were obtained with enzymatic soaking, immunization with lime, mixture of amine and mercaptane together with a small quantity of sodium sulphide.

The use of protheolytic enzymes such as soaking auxiliary or such as principal agent of unhairing is a good system to perform an efficient hair loosening. The use of enzymes needs an accurate control of the working parameters to avoid the nubuck effect on grain surface.

Reported by

Conceria INCAS SpA
56022 Castelfranco di Sotto
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