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US 6,708,531 B1Granted
Ecofriendly bio-process for leather processing
AssigneeCouncil of Scientific and Industrial Research
InventorsPalanisamy Thanikaivelan, Jonnalagadda Raghava Rao, Balachandran Unni Nair, Thirumalachari Ramasami
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Abstract
The present invention relates to an eco-friendly beam house process for de-hairing of leather using commercially available enzymes that obviates the use of lime and other alkalis. The present invention also provides an alternate process for opening the fibers of leather using commercially available enzymes. The present invention further provides a three-step process for tanning hide or skin in a narrow pH range of from about 7.5 to about 8.5.
Claims23
A leather processing technique comprising the steps of:
- i) applying to raw skin or hide a dehairing paste comprising one or more enzymes either individually or in combination with a de-hairing enhancing compound;
- ii) seasoning the skin or hide of step (i) for 8-20 hrs;
- iii) de-hairing the seasoned skin or hide of step (ii);
- iv) applying to the de-haired skin or hide of step (iii) one or more collagen fibre bundle opening enzymes or an alkali;
- v) fleshing and washing the skin or hide of step (iv) to obtain clean pelt having cross section pH of from about 7.5 to about 8.5, and
- vi) tanning the pelt.
3 more elements
Dependencies are inferred from the claim text.