An electrohydrodynamic printhead capable of de-charging ink droplets

Abstract

The invention belongs to the related technical field of electro hydrodynamic spray-printing equipment, and discloses an electro hydrodynamic printing spray head capable of eliminating ink droplet charge. The electro hydrodynamic printing spray head comprises a nozzle joint, a nozzle electrode arranged at one end of the nozzle joint, a nozzle connected to the other end of the nozzle joint, an electrode connecting piece and a plurality of needle electrodes. The nozzle electrode is used for connecting the positive electrode of jet flow power supply. The electrode connecting piece is cylindrical,one end of the electrode connecting piece is connected to the nozzle joint in a threaded mode, and the needle electrodes are connected to the other end of the electrode connecting piece The needle electrodes comprise needle-shaped ends, the needle-shaped ends and the nozzle are accommodated in the electrode connecting piece, and a nozzle opening formed opposite to the needle-shaped ends is formedin the nozzle. The needle electrodes are used for connecting the negative electrode of discharge power supply. According to the electro hydrodynamic printing spray head capable of eliminating the inkdroplet charge, the charge carried by an ink droplet is removed through the needle electrodes, so that the positioning accuracy and the printing effect are improved.

Description

technical field [0001] The invention belongs to the related technical field of electrohydrodynamic jet printing equipment, and more specifically relates to an electrohydrodynamic print nozzle capable of eliminating the charge of ink droplets. Background technique [0002] The electrohydrodynamic jet printing technology is to apply high voltage between the nozzle and the substrate, and the meniscus at the nozzle will have induced charges under the action of the substrate electrodes, so that the meniscus at the nozzle will be affected by the electric field force. The meniscus at the nozzle forms a Taylor cone under the action of gravity, electric field force, surface tension of the liquid, and pressure exerted by the ink supply system. The Taylor cone breaks under certain conditions to form ink droplets, which then fall on the substrate. [0003] In the printing process of electrohydrodynamic jet printing technology, the Taylor cone is actually ejected. The size of the Taylor...

AI Technical Summary

Problems solved by technology

1. The meniscus at the nozzle has an induced charge under the action of the electrode, so that when the ink drop is formed, the ink drop also has an induced charge, and the amount of the induced charge is proportional to the surface area of ​​the ink drop. The droplet is always affected by the electric field force in the process of flying from the nozzle to the substrate; 2. The existing electrojet printing device cannot form a uniform electric field between the nozzle and the substrate, which means that the droplet is in the process of flying 3. Considering the unique high resolution of electrojet printing technology, high positioning accuracy is required when using electrojet printing technology, otherwise it will This kind of high resolution is meaningless, and the trajectory of the ink droplet during flight is unpredictable, which in turn leads to the unpredictable position of the ink droplet falling on the substrate, resulting in a certain deviation, which cannot be compensated in advance; 4 .After the charged droplets land on the substrate, the charge will not be eliminated immediately, which will make the droplets falling on the substrate repel each other. This repulsive force will not only affect the droplets that have already landed on the substrate, but also A macroscopic manifestation of this effect is that when printing at high frequencies, the droplets repel each other and cause the lines deposited on the substrate to break

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