Abstract
A layered structure of the paperboards manufactured from two different consistency levels of pulp slurry was examined by measurement of the fiber orientation in the paper thickness direction. The standard deviation of the probability density distribution function of the fiber orientation in the paperboard made from 3.3% (high consistency) pulp slurry was found to be higher than that from 0.9% (low consistency) slurry. This indicates that the paperboard from a high consistency pulp suspension has rather a felt-like structure. The felt-like sheet structure of the high consistency paperboard was proved to be attributable to the core layer structure. The standard deviation of the fuction in the cross machine direction in all of the paperboards tested was higher than that in the machine direction. This implies the existence of microstriation in the papers which was probably introduced during the drying process.
