METHOD FOR MANUFACTURING A GLASS PANEL FOR A CATHODE RAY TUBE

摘要

The invention relates to a method for press-forming a cathode ray tube panel, in which, before the panel is removed from the press, a heat radiation controlling means (26, 27) is provided at a small distance from the panel, parallel to the panel surface. Said means comprises an area with a high reflectivity for heat radiation, which first area is near the center of the panel. The result of this measure during the cooling of a panel is a more even temperature distribution over the surface of the panel. In particular, the temperature gradient between center and edges of the panel is reduced. Because of the glass wedge of (Real) Flat panels the center of the panel is thinner than the edge of the panel. The thinner part will normally cool down faster because of the lower heat capacity. Local temperature differences over the surface of the panel during cooling down will lead to so-called 'membrane' stresses. The method of the invention will minimize these stresses.