CN106240159A - A kind of predrive method accurately processing the first drop in ink-jet printing technology - Google Patents

Abstract

The invention provides a pre-driving method for accurately processing the first liquid droplet in the inkjet printing technology. Before the inkjet printing machine is officially driven to eject ink, the inkjet printing machine is loaded with a pre-driving voltage for pre-driving, simulating the actual The ink filling process during jetting makes the nozzle fully filled with ink, but no ink drops are ejected, the pre-driving voltage is 50%-70% of the voltage during normal driving, and the number of pre-driving times is 50-300 times. The invention can overcome the problem of low spraying accuracy of nozzles at the initial stage of printing, and avoid the phenomenon of spraying failure caused by nozzle blockage or nozzle solvent evaporation at the initial stage of printing.

Description

A Pre-Drive Method for Accurately Handling First Droplets in Inkjet Printing Technology

technical field

The invention relates to the technical field of inkjet printing, in particular to a pre-driving method for accurately processing first liquid droplets in the inkjet printing technology.

Background technique

Inkjet printing requires an inkjet printing machine, an inkjet printing machine is a non-contact inkjet printing printing equipment, it is not limited by any material, can be printed on wood, glass, crystal, metal plate, Floor tiles, tiles, CDs, acrylic, plexiglass, EVAKT boards, leather, silicone, plastic, PP, PE, PVC, cloth, stickers, stone and other materials for printing on the surface. Moreover, whether it is a simple block-color pattern, a full-color pattern, or a pattern with excessive color, it can be printed at one time without plate making, printing and repeated coloring. The color is beautiful and the effect is realistic. The image is waterproof, sun-proof, and wear-resistant Strong adhesion, no fading, easy machine operation, stable performance, etc. With the development of electronic technology, inkjet printing technology has also become an important technology in image electronic applications such as large-screen displays, radio frequency identification and printed circuit boards.

At the same time, the requirements for the quality of inkjet printing are gradually increasing. Many times different types of jetting materials may be required for precise jetting from the start of printing. In order to control all materials to be ejected accurately, a method of improving ejection precision by changing the number of droplets ejected each time has been proposed, that is, the ink-on-demand method. However, no significant progress has been made in this research work until now. At the same time, controlling the spray position by controlling the number of sprayed droplets also needs to assume that each spray in a large number of sprays is uniform, which means that the droplet volume and total spray There should be a linear relationship between the quantities.

However, due to clogging or the evaporation of the solvent at the nozzle mouth and capillary phenomena, the liquid level of the nozzle will appear in a half-moon shape during the initial period of spraying. In this case, there is no linear relationship between the number of ejected droplets and the total ejection amount. Therefore, the method of improving the spraying accuracy by controlling the number of sprayed liquid droplets has no effect.

Contents of the invention

The purpose of the present invention is to provide a pre-driving method for accurately processing the first droplet in inkjet printing technology. The pre-driving method can overcome the problem of low nozzle ejection accuracy at the initial stage of printing, and avoid nozzle clogging or A phenomenon in which spraying fails due to solvent evaporation from the nozzle.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A pre-drive method for accurately processing the first droplet in inkjet printing technology. Before the inkjet printer is officially driven to eject ink, the inkjet printer is pre-driven with a pre-drive voltage to simulate the actual ejection. The priming process causes the nozzles to be completely filled with ink, but no ink droplets are ejected.

According to the solution above, the pre-driving voltage is 50% to 70% of the main driving voltage.

According to the above solution, the number of times of the pre-driving is 50-300 times.

Because the inkjet process is a process of ink filling and inkjet driven by a series of digital pulses. However, the inkjet process requires the drive voltage to reach a certain magnitude to complete. The pre-driving process is to fill the half-moon-shaped liquid surface of the nozzle due to evaporation by simulating the ink filling process under the action of the driving voltage during actual ejection, so that the nozzle is completely filled with ink, but no ink droplets are ejected.

When the pre-drive voltage amplitude is too small, the pre-drive cannot meet the requirement of making up for evaporation to restore the half-moon liquid level; and when the pre-drive voltage amplitude is too large, ink will be ejected. As long as the pre-driving voltage is within the range of 50% to 70% of the official driving voltage, the ink filling process can be realized without ejecting ink droplets, and the purpose of filling the nozzle can be achieved. The process of forming small liquid droplets under the pre-driving voltage is similar to the formation of ink droplets, but under the action of pre-driving, the half-moon liquid surface will not be broken and the ink will be ejected.

Each pre-drive only fills a small portion of the liquid level, requiring multiple pre-drives to completely fill the nozzle. Since different solvents have different evaporation rates, and even the same solvent may have different evaporation times due to different waiting times, the degree of depression of the half-moon liquid surface is different for each printing. Therefore, it is necessary to calculate the quasi-optimal number of pre-drives according to the degree of depression of the half-moon liquid surface, and then perform pre-drive. When the number of pre-driving times is less than 50 times, the nozzle is not filled completely, and the ideal spray effect cannot be achieved; when the number of pre-driving times is more than 300 times, it will lead to a long pre-driving process, which is also a waste.

The beneficial effects of the present invention are:

1) The present invention greatly reduces the impact of evaporation on the half-moon liquid surface of the nozzle of the inkjet printing machine, greatly improving the spraying accuracy of the nozzle at the initial stage of printing;

2) The present invention adopts the method of multiple pre-drives, so that the nozzles can be filled up at the initial stage of printing, which can avoid the phenomenon of jetting failure caused by nozzle clogging or nozzle solvent evaporation in the early stage of printing.

detailed description

The technical solutions of the present invention will be described below in conjunction with the embodiments.

Example 1:

The invention provides a pre-driving method for accurately processing the first liquid droplet in the inkjet printing technology. Before the inkjet printing machine is officially driven to eject ink, the inkjet printing machine is loaded with a pre-driving voltage for pre-driving, simulating the actual The priming process when jetting causes the nozzles to be completely filled with ink, but no ink droplets are ejected.

Further, the voltage during the formal driving is 100V, and the pre-driving voltage is 60V; the number of times of the pre-driving is 200 times.

The jetting frequency of the nozzles of the inkjet printer in this embodiment is 300 Hz, printing is carried out after 3 hours of ink evaporation, and the nozzles can be completely filled when the pre-driving times are 200 times. It can be seen through a microscope: In the absence of pre-driving, a large number of printing dots will be lost and deformed at the initial stage of printing, and when the number of pre-driving reaches 200 times, the printing quality can reach the point where human eyes cannot distinguish.

Example 2:

The method in this embodiment is the same as that in Embodiment 1, except that: the pre-driving voltage is 50V; the number of times of the pre-driving is 300 times.

Example 3:

The method in this embodiment is the same as that in Embodiment 1, except that: the pre-driving voltage is 70V; the number of times of the pre-driving is 50 times.

The above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the above embodiments have described the present invention in detail, those skilled in the art should understand that the present invention can be modified or replaced without departing from the present invention. Any modifications and partial substitutions in the spirit and scope shall fall within the scope of the claims of the present invention.

Claims (3)

1. A pre-drive method for accurately handling the first droplet in inkjet printing technology, characterized in that, before the inkjet printer is officially driven to eject ink, the inkjet printer is loaded with a pre-drive voltage to pre-drive , simulating the ink filling process during actual ejection so that the nozzle is completely filled with ink, but no ink droplets are ejected. 2 . The pre-driving method for accurately processing the first droplet in inkjet printing technology according to claim 1 , wherein the pre-driving voltage is 50% to 70% of the normal driving voltage. 3 . 3 . The pre-driving method for accurately processing the first droplet in inkjet printing technology according to claim 1 , wherein the number of times of the pre-driving is 50-300. 4 .