Both the distribution of rosin and the water-penetrated portion in handsheet from hardwood BKP (L•BKP) with added some rosin were demonstrated by mapping using Electron Microprobe Analysis (EPMA). Rosin was chemically modified with O
sO
4 in gas phase, and water penetrated portion was labelled by making the sheet to absorb the 15% nickel sulfate solution. The distribution of rosin and the water-penetrated portion were observed from surface side and from cross section side, by observing O
sMα image and NiKα image. As rosin content increased, rosin were found to be distributed with higher concentration on paper surface layer and inside the paper. No NiKα images were found in the emitting portion of O
sMα and no O
sMα images were also found in the NiKα emitting portion.
This shows that the water can not penetrate into the rosin distributed sites. It became clear that the way of penetrating water was different between soap type rosin and emulsion type rosin in paper sheet before heat treatment. It was concluded furthermore that rosin concentration was increased and the water-penetrable portion was decreased by heat treatment of the sheets.
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