| 摘要 |
The floors of industrial areas must have escape route lines. These lines have a short service life, inasmuch as they are subject to the hard wear of transport trucks. The object of the present invention is to extend the service life by means of each line being constructed out of at least three layers (13, 14 and 15), where one layer (13) contains a tint colour, a second layer (14) contains phosphorescent powder and a third layer (15) is translucent, and where all the layers are constructed out of a methyl methacrylate. |
