Claims
- 1. A process for producing paper or paperboard from pulp in the presence of at least one additive, which comprises employing pulp that comprises fibres of which 60 weight-% or below have equal or greater length than 1.68 mm and employing as the at least one additive starch, which has been degraded to a viscosity level of 10-500 mPas (5%. 60° C. Brookfield) and cationized to a charge level of 0.36-1.46 meq/g.
- 2. The process as claimed in claim 1, wherein the additive is added to the pulp prior to web formation.
- 3. The process as claimed in claim 2, wherein the amount of the additive is 0.5-5 kg per ton produced paper.
- 4. The process as claimed in claim 2, wherein the amount of the additive is 0.5-3 kg per ton produced paper.
- 5. The process as claimed in claim 1, wherein 50 weight-% or below of the fibres have equal or greater length than 1.68 mm.
- 6. The process as claimed in claim 1, wherein 45 weight-% or below of the fibres have equal or greater length than 1.68 mm.
- 7. The process as claimed in claim 1, wherein the starch has been degraded by peroxide oxidation method.
- 8. The process as claimed in claim 1, wherein the starch has been degraded to a viscosity level of 40-300 mPas (5%, 60° C., Brookfield).
- 9. The process as claimed in claim 1, wherein the starch has been degraded to a viscosity level of 100-200 mpas (5% 60° C., Brookfield).
- 10. The process as claimed in claim 1, wherein the starch has been cationized with solution cationization method.
- 11. The process as claimed in claim 1, wherein the starch has been cationized with dry cationization method.
- 12. The process as claimed in claim 1, wherein the starch has been cationized to a charge level of 0.36-1.10 meq/g.
- 13. The process as claimed in claim 1, wherein the starch has been cationized to a charge level of 0.72-1.46 meq.g.
- 14. The process as claimed in claim 1, wherein the starch has been cationized to a charge level of 0.72-1.10 mEq/g.
- 15. The process as claimed in claim 1, wherein the starch has been degraded before being cationized.
- 16. The process as claimed in claim 1, wherein the starch has been cationized before being degraded.
- 17. The process as claimed in claim 1, wherein the additive is used together with conventional wet end starch.
- 18. The process as claimed in claim 17, wherein the additive is dosed before the conventional wet end starch.
- 19. A pulp composition for producing paper orpaperboard which comprises pulp having fibres of which 60 weight-% or below have equal or greater length than 1.68 mm and a starch additive, which has been degraded to a viscosity level of 10-500 mPas (5%, 60° C. Brookfield) and cationized to a charge level of 0.36-1.46 meq/g.
Priority Claims (2)
Number |
Date |
Country |
Kind |
981586 |
Jul 1998 |
FI |
|
990227 |
Feb 1999 |
FI |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This a continuation-in-part of our U.S. application Ser. No. 09/743,355 filed Jan. 9, 2001 now U.S. Pat. No. 6,398,912 entitled “Additive for Paper Making”, disclosure of which is incorporated herein by reference which is a 371 of PCT/FI99/00601 filed Jul. 7, 1999.
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Entry |
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Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09/743355 |
|
US |
Child |
10/134497 |
|
US |