| 摘要 |
PURPOSE:To eliminate a clouded film, which is attached on the surface of glass and remains, completely, by washing a cap, in which plate glass is bonded to a metal shell with low-melting-point glass, with acid, finishing the surface by plating, and immersing the cap in soda hypophosphite solution. CONSTITUTION:A glass sealed cap 1 is washed with acid and finished with plating. Then, a clouded film 8 is formed and attached on the inner and outer surfaces of low-melting-point glass 5 of the cap 1. The cap is immersed in soda hypophosphite solution 10 in a tank 9. The soda hypophosphite solution includes, e.g., 10% soda hypophosphite, and the solution is kept at a temperature of 90 deg.C. The cap 1 is immersed in the solution for 10-15 minutes. Then, the cloud contamination of the film 8, which is attached to the surface of the low- melting-point glass 5 of the cap 1 disappears. |
