Patent ID: 8021517
Filing Date: 2011-09-20
Classification: D21G,D21H,G01N

Abstract:
1. An on-line method of monitoring the presence of at least one selected component in a traveling web composition that comprises the steps of: (a) forming an initial web composition at a first location that comprises at least one selected component and at least one species of fluorescent nanoparticles, wherein the amount of the least one species of fluorescent nanoparticles relative to the amount of the at least one selected component is known wherein the at least one selected component is not attached to the at least one species of fluorescent nanoparticles; (b) exposing the web composition to a light source that causes the at least one species of fluorescent nanoparticles to emit fluorescent light; (c) measuring fluorescent light that is emitted by the at least one species of fluorescent nanoparticles in the web composition at a second location that is downstream from the first location; and (d) correlating the fluorescent light measurements made in step (c) to concentrations of the at least one selected components in the web composition wherein the at least one selected component exhibits drainage patterns that are different from those of the at least one species of fluorescent nanoparticles and step (d) applies this difference in correlating the fluorescent light measurements to the concentrations of the at least one selected components.