Highly viscous fluid e.g. ink, drop ejector for drop-on demand system, has inlet pipe coupled to nozzle, where low pressure field is applied in nozzle area via pipe so that fluid remaining in nozzle is sucked off if no fluid is ejected

摘要

The ejector has a sealing seat that ejects fluid drops by the movement of a displacement device and closes a discharge nozzle (3) when no fluid is ejected. A lateral inlet pipe (8) is connected to a discharge nozzle (3) that is proximal to a discharge opening. Additional low pressure field is applied within a defined area of the nozzle via the pipe, such that the fluid remaining in the nozzle is sucked off when no fluid is ejected.