Planographic Paste Application to Sheet Type Parts
Original Publication Date: 1978-Apr-01
Included in the Prior Art Database: 2005-Feb-20
Spacers for gas panels are usually bonded to the glass plates by hot-tip reflowing of a small deposit of glass. This glass is applied to the spacer in the form of paste containing frit, while the spacers are still attached to a sheet of foil from which they were etched. The spacers typically have a cross-section of about 0.1 mm square and are 8 mm long. Consequently, a small dot about 0.08 mm diameter must be printed in the center of one surface without contaminating the other three surfaces with glass paste. Screen printing has been tried, but produced erratic results because of tolerance buildup, screen resolution and paste deterioration. It is also a slow manufacturing process, and has very poor paste utilization.