Inkjet coding technology in the hottest printing p

2022-08-13
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Inkjet coding technology in the printing process 1

inkjet coding "refers to many related technologies. We use these technologies to make very small oil eject from the nozzle with this as the target, and the ink drops pass through the air, and finally fall on the surface of the sprayed object to form a spray pattern. All these related technologies have the following characteristics:

non contact: because only ink droplets contact the surface of the object to be sprayed, moving surfaces and fragile surfaces can be successfully sprayed

changing information: the information can change continuously, so the time, date, batch number and similar data can be changed in real time

speed: using inkjet coding technology, objects with a moving speed of less than 6 meters/second can be used for inkjet printing, which is sufficient for most production processes

like all things, there may be some technologies that are particularly suitable for specific occasions, but in terms of the absolute breadth of application, inkjet coding technology is still unmatched

the technology required for inkjet coding is not new. As early as the 19th century, people have been able to break the ink flow into ink drops, charge and deflect the ink drops. Similarly, piezoelectric materials have existed for some time, for example, they have been used in sonar and cigarette lighters. However, the factors that really promote the development of inkjet coding technology are the need to print date and batch number on products (valve inkjet coder and continuous inkjet coder), and the development of computer printers (pulse inkjet coder)

the development and application of microprocessors

since the 1960s, many magical technologies have been produced. Today, the technologies that can survive and develop are mainly divided into three types: Valve printing, pulse printing and continuous printing. There will be some overlap in the application of these three main technologies, and each has its own strengths and weaknesses

to a large extent, it is these strengths and weaknesses that determine their most suitable application range. The original intention of this article is to introduce each technology to readers, and then help users choose the best solution for themselves. This method of valve printing is the easiest to achieve. In the past 20 years, it has been mainly used in the printing of outer packaging boxes

basically, a valve printing device includes a low-pressure ink system, an electronic control cabinet and a nozzle connected to the cabinet with a flexible conduit. The ink in the ink system is sent to the nozzle in the nozzle through a simple open/close valve (a nozzle generally has 7 to 18 nozzles with a diameter of 200 microns or more). When an ink drop needs to be ejected, the electronic component opens the corresponding on/off valve, and the ink drop is ejected

due to the simple mechanical structure, the valve type printing system is easy to establish. Customers usually choose suppliers by comparing the user interface (i.e. whether it is easy to operate), printing ability/printing diversity/quality and applicable ink series. The printing quality of valve printing is unstable. This is because the ink has been stuck in the nozzle before being shot. Vigorously develop the plastic granulator technology that uses renewable energy and industrial waste heat. If the ink dries in the pipeline, it will cause blockage. The system works best when using water-based ink to spray print on permeable surfaces. Many manufacturers of valve inkjet printing systems produce non permeable surface inks that dry faster than water-based inks. At this time, blockage will occur from time to time, and the drying time is still quite long, about 15 to 30 seconds

in general, if the requirements for printing quality are not high and the nozzle is often cleaned, the valve type printing system can perform well. Although the purchase cost is low, the use cost of the valve type inkjet printing system is higher after a year or two, so this technology is gradually replaced by the pulse type inkjet printing technology. Pulse printing pulse printing technology is mainly divided into two types: piezoelectric printing and bubble printing. The realization of these two technologies is very different

the experimental pulse printing nozzle with strict requirements developed from the field of office printing. Pulse printing is now widely accepted in the field of office printing and has good results. Although pulse printing is simple in concept, it is worth noting that no one obtained the initial patent until the 1970s, and although canon, Hewlett Packard and other companies did a lot of research, it was not until the 1990s that cheap and reliable products were put on the market. So pulse printing is not as simple as it seems. There are still many things to do, from printing on clean paper at a fixed printing distance in the office to completing ink-jet coding in the harsh environment of the factory

piezoelectric jet printing

pulse jet printing technology first appeared piezoelectric jet printing. In short, the ink pressure in the nozzle must be low enough (or negative pressure), because it is the surface tension of the ink that keeps the ink in the nozzle, and a pulse voltage is required to be applied to the piezoelectric crystal, which will deform and reduce the volume of the nozzle ink cavity. In this way, a drop of ink is ejected from the nozzle. Then, the piezoelectric crystal returns to its original state, and the new ink enters the nozzle due to the surface tension. (to be continued)

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