A colored thin glass layer (0. 1-0. 2 μm thick) was formed on a glass surface by the dippingwithdrawing coating method : A glass plate was immersed in colored coating solutions, which consisted of tetraethoxysilane or methyltriethoxysilane, ethanol, water, and cationic organic dyes in the presence of acid, and withdrawn at 1 mm/s. Cationic dyes, such as triphenylmethane dyes, phenoxazine dye, and phenothiazine dye, can be soluble uniformly by such the silica sol processing conditions. The effects of nickel complexes and matrix gels on the photofading of the colored thin glass films by the irradiation of filtered visible light (>390 nm) using 500 W Xe lamp were studied. It was found that bis (o, o'-diethylphosphorodithiolato) nickel was the most effective in inhibiting the photofading of the thin glass film colored with cationic dyes.
We produced a continuous annular-stirred bead mill (Spike mill) for trial and investigated the grinding efficiency of the mill. The mill has a cylindrical rotor with regularly arranged rhombic protuberances on the surface in the grinding chamber. In order to investigate the effect of the shape of the protuberances on wet grinding efficiency, we produced several rotors with protuberances which differed in the angle to the rotational direction of the rotor. Furthermore, with the grinding energy, defined by the energy input per unit solid volume as the grinding energy, the grinding efficiency of the Spike mill was compared with that of a disk-stirred bead mill, which has been widely used in industry. As a result of the grinding tests, it was found that a rotor with the protuberance, the side of which is vertical to the rotational direction of the rotor, has the highest grinding efficiency. It was also found that the Spike mill could yield a product that was fine and had a narrow particle size distribution at a lower grinding energy than the disk-stirred bead mill because the flow behaviour of the feed in the grinding chamber was close to plug flow, i. e., the grinding of the feed through the mill was uniform. Further, we investigated the effect of various grinding factors on the grinding efficiency of the Spike mill.
We produced a continuous annular-stirred bead mill (Spike mill) for trial and investigated the grinding efficiency of the mill. The Spike mill has a cylindrical rotor with regularly arranged rhombic protuberances on the surface in the grinding chamber. In this paper, we investigated the effect of various grinding factors, such as gap between the cylindrical rotor and the static vessel, height of the rhombic protuberance, circumferential speed of the rotor, filled ratio of the grinding medium, volumetric solid concentration of the grinding feed and apparent residence time, on the grinding efficiency of the Spike mill and two types of disk-stirred bead mill, which have been widely used in industry.