| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a porous fiber unit having changeable indicating function and/or invisible information rewriting function, and to provide a sheet using the porous fiber. <P>SOLUTION: The porous fiber unit 11 comprises a porous fiber having many void parts 12 and a display material and/or recording material 13 varying corresponding to outside stimulation, which display material and/or recording material 13 is included in the porous fiber void parts, and a porous fiber unit 11 comprising a porous fiber having many void parts and hollow parts larger than other void parts at the center part of the void parts, and a display material and/or recording material 13 varying corresponding to outside stimulation, which display material and/or recording material 13 is included in the porous fiber void parts and the hollow parts. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
