抄録
Polyvinyl alcohol (PVA) is used as a surface sizing agent of paper sheets. This report deals with the penetrability of PVA into the paper sheet structures. For paper sheet surface-sized by PVA, the PVA distribution in the paper sheet affects paper properties and printing qualities. Therefore, it is important to obtain information on the PVA distribution. However, the PVA distribution in paper sheet cannot be observed exactly by conventional methods. In the present study, we apply a new technique by combining the FIB method with EPMA after iodine labeling of PVA to the paper sheet, in order to obtain exact information on the interaction between the substrate structure and PVA. This novel technique enable us to clearly observe the distribution of PVA that has penetrated into the paper structure. Furthermore, we found that the difference in the distribution of PVA that penetrated into the paper structure influenced the liquid permeability of the oil type ink applied to the paper sheet.
