| 摘要 |
PURPOSE: To provide a reversible thermosensitive recording paper for word processors and printers using recycled pulp of used paper. CONSTITUTION: A base material of paper uses a recycled pulp of 10wt.% or more consisting of used paper, wherein an average fiber length of the recycled pulp is 0.6cm or longer and Canadian standard freeness is made 150 or more, further a dirt number of the recycled pulp surface is made 130pieces/m<2> or lower for 0.08mm<2> or wider, and a total number thereof is made 1250pieces/m<2> for 0.03mm<2> or wider. In this way, there exist small corrugation curls in the case of repeating coloring and discoloring operations by heat, and appears almost no decrease of whiteness degree. |
