Process for tanning fish skins
OwnerNorberto O. S. Regoinventor
Life of this patent
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Abstract
Tanned fish skins of good quality may be obtained by (a) contacting dry fish skins with an aqueous solution of a neutral salt said solution having a pH adjusted into the range 1.5 to 3.5, (b) subjecting said fish skins to a two step tanning operation wherein after said first tanning step said skins are washed at a temperature of not more than 35.degree. C. and the second tanning step is carried out using a more concentrated solution than the first tanning step at a temperature of not less than 35.degree. C. and (c) washing the tanned skins and treating them in an aqueous bath with an anionic grease and then an oil and then with an alkali metal salt of a weak organic acid followed by an alkali to raise the pH to at least 6.
Claims17
A process for the production of tanned fish skins which comprises:
- (a) contacting dry fish skins with an aqueous solution of a neutral salt said solution having a pH adjusted into the range 1.5 to 3.5,
- (b) subjecting said fish skins to a two step tanning operation wherein after said first tanning step said skins are washed at a temperature of not more than 35.degree. C. and the second tanning step is carried out using a more concentrated solution than the first tanning step at a temperature of not less than 35.degree. C. and
- (c) washing the tanned skins and treating them in an aqueous aqueous bath with an anionic grease and then an oil and then with an alkali metal salt of a weak organic acid followed by an alkali to raise the pH to at least 6.
Dependencies are inferred from the claim text.