Back to results
US 5,908,535 AGranted
Method for determination of filler content in paper
AssigneeStfi
InventorsPer-Ivar Fransson, Lars Granlof, Mats Hagberg, Matts Jegeback
Life of this patent
Estimating the term…
Abstract
A method of determining the filler content of paper, wherein the paper stock is examined prior to delivering the stock to the de-watering section of the paper machine, and wherein the volume concentration of particles in the stock that have a size which is greater than the characteristic size of the filler is determined at varying mechanical working of the pulp, and the amount of filler retained in the paper is predicted from the result of at least two such determinations.
Claims8
A method of determining a filler content of paper comprising the steps of:
- examining paper stock prior to delivery to a de-watering section of a paper machine;
- measuring a volume concentration of particles in the stock that have a size greater than the size of the filler while the paper stock is subjected to at least two degrees of mechanical working;
- determining the amount of filler retained in the paper from a change in measured volume concentration between at least two such determinations of volume concentration.
Dependencies are inferred from the claim text.