Claims
- 1. A method for recovery of branch knot wood from oversize chips, comprisinggrinding the oversize chips to splinter, drying the splinter, mixing the dry splinter with water, and recovering sedimented splinter containing high concentrations of extractive substances and having a high specific weight.
- 2. The method of claim 1, wherein the oversize chips are screened with a strong air stream in order to separate a chip fraction with an increased specific weight, which only then is ground to splinter.
- 3. The method of claim 1, wherein the oversize chips are ground to splinter having an average length of 5 to 70 mm, and a thickness of 2 to 10 mm.
- 4. The method of claim 3, wherein said splinter has an average length of 5 to 30 mm and a thickness of from 2 to 7 mm.
- 5. The method of claim 1, wherein the splinter is dried to a dry matter content of at least 85%.
- 6. The method of claim 5, wherein said splinter is dried to a dry matter content of at least 87%.
- 7. The method of claim 1, wherein the sedimented splinter is fractioned and extracted in order to obtain at least one extractive substance selected from the group consisting of lignans, flavonoid, stilbens, tannins, isoflavonoids and phenolic acids at a dry matter content of at least 85 %, advantageously at least 87 %.
- 8. The method of claim 7, wherein said extractive substance has a dry matter content of at least 87%.
- 9. A method for recovery of normal wood for the production of pulp from oversize chips, comprisinggrinding the oversize chips to splinter, drying the splinter, mixing the dry splinter with water, so that splinter rich in extractive substances and having a high specific weight is sedimented, and so that splinter rich in normal wood and having a lower specific weight will float up to the water surface, separating the splinter which is sedimented in the water from the splinter floating up to the water surface and having a lower specific weight, and recovering the splinter floating up to the water surface.
- 10. The method of claim 9, wherein the oversize chips is ground to splinter having an average length of 5 to 70 mm and a thickness of 2 to 10 mm.
- 11. The method of claim 10, wherein said splinter has an average length of 5 to 30 mm and a thickness of 2 to 7 mm.
- 12. The method of claim 9, wherein the splinter is dried to a dry matter content of at least 85%.
- 13. The method of claim 12, wherein said splinter is dried to a dry matter content of at least 87%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
20001739 |
Aug 2000 |
FI |
|
Parent Case Info
This application is a U.S. National Stage of International application PCT/FI01/00691, filed Aug. 2, 2001.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/FI01/00691 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO02/09893 |
2/7/2002 |
WO |
A |
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
Country |
74493 |
Oct 1987 |
FI |