| 摘要 |
PURPOSE:To maintain the whiteness of recording paper high even if the paper thickness is reduced by mingling or coating fine powder form members in the recording paper then applying pressing. CONSTITUTION:At the time of reducing paper thickness through treatment such as pressing or the like, various kinds of fine powder form members are mingled in recording paper or once coated on the recording paper then the paper is subjected to pressing so that the fine powder form members are buried in the recording paper. As the abovementioned powder members, the white ones enumerated below are used: These include aluminum oxide, zirconium oxide, zinc oxide, tin oxide, tantalum oxide, titanium oxide, calcium carbonate, barium carbonate, silicon dioxide, calcium sulfate, barium sulfate, etc. |
