| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a recording paper sheet capable of reducing its curlling even when its moisture is high. <P>SOLUTION: In the recording paper sheet using at least cellulose pulp as raw material, permanent set ε in a CD direction of the paper sheet expressed by a following expression is within 0.001 to 0.050%. The permanent set ε(%) in the CD direction of the paper sheet = (ΔL/L)×100. In the expression, ΔL expresses the dimensional variable (μm) of a paper sheet sample having 4 mm width and 30 mm length, which is obtained three seconds after maximum value of tensile stress is applied when the tensile stress is released to 0.0025 N/mm<SP>2</SP>at the speed of 15 N/sec immediately after the tensile stress is applied to 1.4 N/mm<SP>2</SP>at the speed of 15 N/sec after the paper sheet sample is left under environment of 50°C and 65% RH as it is for twenty minutes while the tensile stress of 0.0025 N/mm<SP>2</SP>is applied thereto, and L expresses the initial dimension (μm) of the paper sheet sample. <P>COPYRIGHT: (C)2008,JPO&INPIT |
