| 摘要 |
<P>PROBLEM TO BE SOLVED: To objectively and visually provide an accountable time for a gel sheet to a user. <P>SOLUTION: The gel sheet with a base of sheet-like nonwoven fabric, a hydrous gel layer mounted on one side of the base and a film layer covering the hydrous gel layer sequentially, includes a chromic material with changeable reflectivity due to hydration or a chromic material becoming transparent with hydration. <P>COPYRIGHT: (C)2013,JPO&INPIT |
