Skins and pelts one-step treatment - to effect soaking, unhairing, skin disintegration and drenching, using aq. bath contg. fungus- and bacterial proteinase

摘要

Unhaired hides ready for tanning to high quality leather are prepd. by treating the raw material, washed free from preserving salt, in a vat or mixer, using an aq. bath contng. dissolved (a) fungus proteinase having optimum activity towards casein at pH 7, (b) bacterial proteinase having optimum activity towards haemoglobin at pH 9, (c) a pri. sec. or tert. amine or cpd. dissociating to form such an amine and opt. (d) a reducing organic S cpd., and adjusting bath to pH 9-12. Pref. proportions of fungus- and bacterial proteinases used are such that proteolytic activity of fungus proteinase in bath is higher than that of bacterial proteinase. Fungus proteinase is derived esp. from aspergillus niger or -flavus cultures, and is used in mixture contng. esp. bacillus subtilis-generated proteinase.