Fluid drop ejection

Abstract

A drop ejection system includes a flow regulator that can regulate the fluid flow to enhance fluid purging from the fluid ejection head and other system operations. The drop ejection system can include a drop ejection head with a plurality of nozzles, a pumping chamber, and a fluid purge unit capable of purging the fluid from the nozzles by generating a negative pressure outside of nozzles. The flow regulator can increases the flow resistance of the fluid flow to the drop ejection head when the fluid is purged out of the nozzles.

Description

technical field [0001] This application relates to the field of droplet ejection. Background technique [0002] In many inkjet systems, a piezoelectric crystal having a pressure-generating surface in communication with a channel is usually used to apply successive cycles of decreasing and increasing pressure to the ink in the channel, thereby providing the ink with a drop-by-drop pattern. Chambers or channels connected by pores of ink. If the ink introduced into the channel contains dissolved air, the depressurization of the ink during the pressure reducing portion of the pressure cycle will cause the dissolved air to form small bubbles in the ink within the channel. Repeated depressurization of the ink in the chamber causes these air bubbles to grow, and these air bubbles may lead to malfunction of the inkjet device. Also, air bubbles can be introduced into the ink channels by suction at the nozzles, flowing in from a reservoir or canister as the ink temperature cycles du...

AI Technical Summary

Problems solved by technology

Therefore, the effectiveness of the pressure ink cleaning method to remove air bubbles is fundamentally limited

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