Cellulosic Microfibril Moisture Binding Mechanisms in Packaging
Microfibril moisture binding follows GAB sorption kinetics where mesopore condensation above M0 plasticizes fiber networks, requiring crosslinking to preserve barriers.
BJH Pore Analysis
Porosity Measurement Method
Pore size distribution measurements quantify the volume of voids within a coating layer or a paper structure to determine its liquid absorption characteristics. Using the bjh pore analysis method involves calculating the volume of pores based on the amount of nitrogen gas that evaporates from the sample at specific pressures. This technique provides a map of the internal structure that is too small to see with a standard microscope.
Analytical Procedure
The calculation assumes that the pores are cylindrical and that the liquid nitrogen forms a layer on the walls of the voids. As the pressure decreases, the liquid evaporates from the largest pores first. This step by step measurement allows scientists to determine the exact diameter of the channels that carry ink into the paper.
The data is plotted as a distribution curve to show the range of pore sizes present in the coating.
Coating Assessment
Paper manufacturers use this information to optimize the surface of high quality printing papers. A coating with many small pores will hold the ink on the surface for better color density. This analysis is a standard part of the research into new pigments and binders for the packaging industry.