| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a multilayered hardboard which has easy and high disintegrating properties on a dissolution treatment even in an unopened packed state receiving confidential report waste paper, can hold a sufficient strength, is excellent in ruled line-bending resistance suitability and printing suitability, can be used for high quality waste paper while being recovered and received the confidential report waste paper, and can be used for outer sheaths, cores and inner sheaths. <P>SOLUTION: There is provided a multilayered hardboard which can be used as at least one of the outer sheath, core and inner sheath of a corrugated board sheet constituting a corrugated board case for recovering, receiving waste paper and has at least a front surface layer and a back surface layer, wherein a mechanical pulp fiber content determined by a discrimination method using a C dyeing liquid in accordance with JIS P 8120 (1998) is 3 to 30 mass%; the brightness of hand-made paper prepared from pulp disintegrated by a method based on JIS P 8220 (1998), is not less than 75% by a method based on JIS P 8222 (1998); and the basis weight is 80 to 220 g/m<SP>2</SP>. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
