Conditioning hides and pelts for leather mfr. - with preserving soln. contg. (in)organic aluminium salt(s) and pref. biocide

摘要

Hides and pelts for further working to leather are conditioned by treatment with a preserving soln. contg. pref. 1-10 (2-6) wt.%, w.r.t. green wt. of hides and pelts, of at least 1 Al salt. (In)organic acid-derived Al salts can be used, esp. (i) the chloride, sulphate or sulphite and (ii) the acetate, formate, tartrate, oxalate, lactate, glycolate, adipate, salicylate, benzoate, p-hydroxy-benzoate, sorbate, naphthalene sulphonate or glutarate. The preserving soln. can be filled in the barrel, mixer or tanning machine. Liquor vol. should not exceed 30-80% and is esp. 20-30% w.r.t. hide wt. In addn. to the Al salt, the preserving soln. can contain at least 2 wt.% standard hide- and pelt-preservative, partic. a biocide, esp. a bisulphite, fluoride, quat. ammonium cpd. and/or phenolic cpd. and/or a biocidal organic acid. The process can be applied to all leather types, e.g. shoe soles- and shoe upper-leather, furniture, clothing and glove leather. Soaking liquor salt content is reduced. The hides are easily unhaired in lime liquor. The treated hides are no longer slippery after airing, but can be stacked and stored at room temp.