Patent ID: 8470451
Filing Date: 2013-06-25
Classification: B05D,B43L,G03B,Y10T

Abstract:
1. A projection blackboard, comprising: at least one enamel layer on a metallic substrate, wherein an outermost surface enamel layer of the at least one enamel layer is positioned as an outermost layer of the projection blackboard, said outermost surface enamel layer being an enameling upper glaze comprising a blend of particles coated with titanium dioxide and a transparent mat glaze, the surface enamel layer having, i) a color tone with a brightness V prescribed in JIS Z 8721-1993 from 3.0 to 7.0, ii) a surface characteristic with a surface roughness Rz prescribed in JIS B 0601-200from 5 to 25 μm, and iii) a reflective characteristic with a peak gain of 0.28 or more.