Claims
- 1. A process for finishing animal hides or pelts, comprising:
- soaking the animal hides or pelts in a soak solution; and
- after soaking, treating the hides or pelts with a tanning solution in which carbon dioxide has been dissolved under pressure.
- 2. The process according to claim 1, including washing the hides or pelts before the treating step.
- 3. The process according to claim 1, wherein the tanning solution additionally comprises fats which are emulsified in an aqueous phase.
- 4. The process according to claim 1, wherein after the treating step, the animal hides or pelts are dried and then treated with fat which is dissolved in pressurized carbon dioxide.
- 5. The process according to claim 1, including conducting the treating in a countercurrent manner, wherein fully tanned hides or pelts are treated with fresh tanning solution while untanned hides or pelts are treated with partially spent tanning solution.
- 6. The process according to claim 1, including dissolving carbon dioxide in the soak solution under pressure.
- 7. The process according to claim 1, wherein the carbon dioxide pressure is 5 to 300 bar.
- 8. The process according to claim 1, wherein the solution in which carbon dioxide has been dissolved under pressure has a temperature in the range from 0 to 60.degree. C.
- 9. The process according to claim 1, wherein a mass ratio between the soak solution and the animal hides or pelts is in the range from 1:1 to 4:1.
- 10. The process according to claim 1, including conducting the treatment under carbon dioxide pressure for a period of about 30 minutes to about 3 hours.
- 11. The process according to claim 2, wherein after the treating step, the animal hides or pelts are dried and then treated with fat which is dissolved in pressurized carbon dioxide.
- 12. The process according to claim 2, including conducting the treating in a countercurrent manner, wherein fully tanned hides or pelts are treated with fresh tanning solution while untanned hides or pelts are treated with partially spent tanning solution.
- 13. The process according to claim 4, including conducting the treating in a countercurrent manner, wherein fully tanned hides or pelts are treated with fresh tanning solution while untanned hides or pelts are treated with partially spent tanning solution.
- 14. The process according to claim 2, including dissolving carbon dioxide in the soak solution under pressure.
- 15. The process according to claim 4, including dissolving carbon dioxide in the soak solution under pressure.
- 16. The process according to claim 5, including dissolving carbon dioxide in the soak solution under pressure.
- 17. The process according to claim 1, wherein the carbon dioxide pressure is 15 to 50 bar.
- 18. The process according to claim 4, including conducting the treatment under carbon dioxide pressure for a period of about 30 minutes to about 3 hours.
- 19. The process according to claim 6, including conducting the treatment under carbon dioxide pressure for a period of about 30 minutes to about 3 hours.
Priority Claims (1)
Number |
Date |
Country |
Kind |
195 07 572 |
Mar 1995 |
DEX |
|
BACKGROUND OF THE INVENTION
This application is a 371 of PCT/EP96/00882 filed Mar. 1, 1996.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/EP96/00882 |
3/1/1996 |
|
|
11/19/1997 |
11/19/1997 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO96/27682 |
9/12/1996 |
|
|
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5326377 |
Tuohimaa et al. |
Jul 1994 |
|
5512058 |
Gavend et al. |
Apr 1996 |
|
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Number |
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EPX |
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EPX |
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EPX |
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Nov 1992 |
DEX |
9408054 |
Apr 1994 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Sharphouse, The Leatherworker's Handbook, pp. 37-42 (month unknown), 1963. |