Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Reexamination Certificate
2005-09-20
2005-09-20
Alvo, Steve (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
C162S061000, C162S076000, C073S053030, C436S164000, C436S171000
Reexamination Certificate
active
06946056
ABSTRACT:
Method for enabling the paper pulp production process to be controlled in such a way that the hexenuronic acid content in the pulp can be minimized and the color reversion of the pulp and/or the pulp products thereby minimized. The method is based on measurements of the optical properties of a fiber containing substance or process stream in the wavelength region 232±5 nm and another wavelength interval. A significant value for the current hexenuronic acid content is formed by correcting the intensity in the spectrum around 232 nm by the corresponding optical quantity at the other wavelength interval. The content of the hexenuronic acid content that is determined by the analysis is then used for controlling conditions in the process stage.
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Alvo Steve
Kvaerner Pulping AB
Rolf Fasth Fasth Law Offices
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