| 摘要 |
PROBLEM TO BE SOLVED: To provide a writing plate which solves the problem that an image acquired from a variation of light penetration, the concentration of a drawing line are small from the structure since a material which constitutes a sheet material is composed of an inorganic pigment and a bonding agent, and which is easy to erase and writable for a brush drawing line, produces no dregs, has light weight, and can also carry refractility. SOLUTION: In the writing plate which is made by sticking porosity sheet layers made of resin and opaque and colored layers at least, writing down on the porosity sheet layer surface made of the resin with a transparent ink including water or an organic solvent, thereby impregnating the transparent ink to the porosity sheet and raising the light transmittance of the porosity sheet and making the color of the layers opaque underlayer and colored through the part of the written drawing line; the porosity sheet layers made of the resin consists of the surface of a diameter r1 of average passage whose relation of the diameter of the passage is r1>r2 and the surface of the diameter r2 of the average passage. The problem is solved by turning and sticking the surface of the average passage r2 to the opaque and colored layers. COPYRIGHT: (C)2007,JPO&INPIT
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