Method of treating hides
AssigneeAGA Aktiebolag
InventorsTimo Tuohimaa, Aila Ukkonen
Life of this patent
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Abstract
There is described a method for treating delimed and bated hides, i.e. pelts. According to the inventive method, the pelts are brought to a suitable mineral tanning state and then tanned with mineral salts. The inventive treatment process corresponds to the conventional processes of pickling, tanning and basifying. The inventive method includes the treatment of pelts with weakly acid treatment liquids while supplying carbon dioxide and additions of tanning mineral substances subsequent to pretreatment, without or with the addition of solely a small amount of liquid, wherein the quantity of treatment liquid is supplemented after a predetermined treatment time.
Claims16
A method of pre-treating and mineral-tanning hides or pelts which have been delimed and bated, characterized by agitating the pelts in a treatment vessel with a wash liquid containing 0.2-0.5 weight percent of acid based on the weight of the pelts;
- supplying carbon dioxide to said liquid during the treatment process in an amount corresponding to 0.5-5 percent of the weight of the pelts;
- draining the washing liquid from said pelts;
- optionally repeating the treatment with washing liquid at least once;
- and tanning said pelts with a mineral tanning substance after draining, or in case of repeated washing, final draining of washing liquid from the pelts.
Dependencies are inferred from the claim text.