Claims
- 1. A method of measuring the quality properties of paper and/or board on moving webs, comprising using a contactless optical method to provide continuous optical spectra which are measured and evaluated by chemometric methods comprising a first modeling stage in which basic properties including material composition of the paper or board are determined from the measured spectra; a second modeling stage in which filter properties including freeness of the paper or board are determined from the measured spectra and the basic properties determined in the first stage; and a third modeling stage in which individual variables of said paper or board are determined.
- 2. The method as claimed in claim 1, wherein said determination of said basic properties of said paper or board comprise determination of grammage of said paper or board.
- 3. The method as claimed in claim 1, wherein said determination of said basic properties of said paper or board comprise determination of moisture of said paper or board.
- 4. The method as claimed in claim 1, wherein said determination of said basic properties of the paper or board comprise determination of a thickness of said paper of board.
- 5. The method as claimed in claim 1, wherein during said determining of said material composition a content of fibrous materials is determined.
- 6. The method as claimed in claim 1, wherein during said determining of said material composition a content of cellulose material is determined.
- 7. The method as claimed in claim 1, wherein during said determining of said material composition a content of auxiliary materials is determined.
- 8. The method as claimed in claim 1, wherein during said determining of said freeness mechanical values of said paper or board are determined.
- 9. The method as claimed in claim 8, wherein said mechanical values determined comprise tearing lengths.
- 10. The method as claimed in claim 8, wherein said mechanical values determined comprise bursting strength.
- 11. The method as claimed in claim 8, wherein said mechanical values determined comprise tear propagation resistance.
- 12. The method as claimed in claim 8, wherein said mechanical values determined comprise modulus of elasticity.
- 13. The method as claimed in claim 8, wherein said mechanical values determined comprise extension at break.
- 14. The method as claimed in claim 1, wherein said determining said individual variables comprises determining optical properties.
- 15. The method as claimed in claim 14, wherein said optical properties determined comprise a light scattering coefficient.
- 16. The method as claimed in claim 14, wherein said optical properties determined comprise a light absorption coefficient.
- 17. The method as claimed in claim 14, wherein said optical properties determined comprise opacity.
- 18. The method as claimed in claim 14, wherein said optical properties determined comprise a reflectance.
- 19. The method as claimed in claim 1, further comprising detecting a cross-machine profile of the basic and further properties of the paper or board on the moving web.
- 20. The method as claimed in claim 19, wherein a measurement of data for determining the input variables for said modeling is carried out on said web without traversing.
- 21. The method as claimed in claim 20, wherein said measurement is carried out with a sensor array.
Priority Claims (1)
Number |
Date |
Country |
Kind |
198 50 825 |
Nov 1998 |
DE |
|
SPECIFICATION
This application is a continuation of PCT/DE99/03510, filed Nov. 3, 1999.
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Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/DE99/03510 |
Nov 1999 |
US |
Child |
09/849016 |
|
US |