| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a (reversible) multilayer cardboard capable of using both side surfaces of its front layer surface and back layer surface as an outer surface, and a method for producing the same. <P>SOLUTION: This multilayer cardboard consisting of a front layer, back layer and an intermediate layer of one layer or≥2 layers is characterized by having 120-300 g/m<SP>2</SP>range unit weight, 10-400 sec range smoothness of both of the front layer surface and back layer surface and 3-200 g/m<SP>2</SP>range water absorption of the front layer surface and back layer surface at 10 sec contact time with water in accordance with JIS P8140. Also the method for producing the multilayer cardboard is provided by using both 200-420 cm<SP>3</SP>Canadian standard water filterability paper making raw material pulp for the front layer and back layer and smooth-treating both front layer surface and back layer surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
