Patent ID: 6045615
Filing Date: 2000-04-04
Classification: H05K

Abstract:
A paste or viscous liquid material dispensing system for dispensing the paste onto a ceramic greensheet substrate comprising:a reservoir for holding the paste, the reservoir having at least one opening in the bottom thereof;nozzle means secured to the bottom of the reservoir comprising a nozzle housing having an open bottom and an inlet opening and an outlet opening at opposed upper ends thereof with the inlet and outlet openings communicating with the reservoir, and a nozzle plate at the base of the nozzle housing having a nozzle plate opening therein communicating during dispensing with the opening at the bottom of the nozzle housing and through which nozzle plate opening the paste is dispensed onto a greensheet substrate;paste moving means within the nozzle housing which recycles paste from the reservoir to the nozzle housing and back to the reservoir by drawing paste from the reservoir through the inlet opening into the nozzle housing, advancing the paste entering the nozzle housing along the length of the nozzle housing to the outlet of the nozzle housing and forcing the paste back to the reservoir through the outlet opening;means for communicating the nozzle plate opening with the opening in the nozzle housing so that in the open position the nozzle plate opening and the opening in the nozzle housing are in communication and paste is both recycled to the reservoir through the nozzle housing outlet and forced through the nozzle plate opening to the substrate and, in a closed, non-communicating position, the paste is only recycled.