Influence of Different Base Papers on the Water Retention Capacity
This application report uses rotational rheology to show how two different coating masses using different base influence the water retention. Variations in the rheological behavior (viscosity over time) concerning the coating process were detected. Those measurements are helpful for the pulp and paper industry, as well as for all applications where dewatering of a sample is important. In research and development, for example, new formulations and material combinations can be established. The used base papers have different properties such as grammage, surface structure and morphology.
The retention capacity of the liquid phase of a homogeneous sample plays an important role in various applications. A well-known example is the pulp and paper industry. In the so-called coating process, the coating mass is applied to the paper. Depending on the type of mill, the liquid content is reduced by using e.g. the roller coater method, film press method or squeegee method. The influence of different base paper samples can be described by the water retention capacity. Using the Anton Paar immobilization cell in combination with a rheometer provides data (viscosity over time) to understand the behavior of different sample combinations. The water retention capacity is described by a strong increase of the viscosity in the measurement. This can be useful, for example, in research and development to investigate improved or new formulations.
Depending on the base paper sample, the retention capacity is stronger or weaker, occurs earlier or later and leads to a very strong or rather weak increase in viscosity.
The aim of this report was to show the influence of different base paper samples on the shear rate to simulate different process conditions. Two different coating masses were selected.
In addition to the pulp and paper industry, the concept can be used in every single process where the liquid retention capacity of a sample is of interest.
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