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    • 100. 发明授权
    • Projection blackboard
    • 投影黑板
    • US08470451B2
    • 2013-06-25
    • US12065510
    • 2005-11-28
    • Kazuhiro Hayashi
    • Kazuhiro Hayashi
    • B32B15/04B32B15/18B32B15/20B32B18/00
    • B05D3/0209B43L1/04B43L1/10G03B21/60Y10T428/12535Y10T428/12618Y10T428/12993
    • A projection blackboard having both of an excellent blackboard function and an excellent screen function, and a process for producing the same. The surface enamel layer that is an outermost layer of the enamel layers is formed by using a enameling upper glaze wherein at least titanium oxide coated particles, or a titanium oxide glaze together therewith is blended into a. transparent mat glaze, so as to render the layer an enamel layer having a predetermined color tone, a surface characteristic that the Rz is from 5 to 25 μm and a reflective characteristic that the peak gain is 0.28 or more, or having these properties and a glossiness Gs(75°)of 1 to 30%. This makes it possible to produce a blackboard excellent in both of blackboard function and screen function. The titanium oxide coated particles are preferably particles wherein surfaces of mica particles are coated with titanium oxide.
    • 具有优异的黑板功能和优异的屏幕功能的投影黑板及其制造方法。 作为搪瓷层的最外层的表面搪瓷层通过使用搪瓷上釉而形成,其中至少将氧化钛涂覆的颗粒或与其一起的氧化钛釉料混合到其中。 透明垫釉,以使层具有预定色调的搪瓷层,Rz为5至25μm的表面特性和峰值增益为0.28或更大的反射特性,或具有这些性质和 光泽度Gs(75°)为1〜30%。 这使得可以生产黑板功能和屏幕功能均优异的黑板。 氧化钛涂覆的颗粒优选是其中云母颗粒的表面被氧化钛涂覆的颗粒。