Talking about the Application of Different Printing Methods in Inkjet Printing (2)

This method relies on changes in the ink composition or mechanically more sophisticated improvements.

Another method to achieve piezoelectric printing is to heat the print head while using a hot melt ink. In this way, the ink remaining fluid in the nozzle solidifies on the surface of the colder printed object. The piezoelectric print system can achieve good results on many printed surfaces, but it is easily scraped off during touch. In addition to the problem of the ink drying out in the nozzle, another problem that needs attention is that the nozzle is sensitive to vibrations. The vibration can cause the ink to be ejected out of the nozzle and the ink chamber so that the surface tension cannot cause the ink to fill the nozzle. The system must then be restarted. Obviously, the print quality has been affected when vibration problems are discovered.

Bubble jet printing

Bubble jet printing technology is a newer technology that is still widely used in office space.

A voltage is applied to the two terminals. Due to the resistance between the terminals, the ink is heated to form a vapor bubble, and a drop of ink is ejected from the nozzle due to the expansion of the chlorine bubble. When the voltage between the terminals is removed, the air bubbles disappear and a new ink is filled in the nozzles due to surface tension. Like piezo-electric printing technology, a series of nozzles can be arranged together to get a larger print range. The degree of resolution is largely determined by the denseness of the arrangement of the nozzles.

The ink characteristics are particularly important for the normal operation of the bubble jet system. In the office, it is possible to control the surface of the printed matter to match it with the ink, but it is completely different in the production environment. For this reason, the impact of bubble jet printing technology in the field of product coding has been limited. However, in the case of bubble jet printing inks, we can get excellent jet printing results.

Continuous inkjet coding has a wide range of applications, and it may be the most diverse technology. From the mid-1970s to the end of the 1970s, the early continuous inkjet coding machines were complicated to operate and had frequent failures. This impression still exists, but the situation has changed, just as the car no longer leaks when we drive. The latest continuous inkjet coding system requires only the operator to press the ON/OFF key and perform routine maintenance once a week, and maintains much less maintenance than other ill-fated devices. There are two related but different continuous inkjet coding technologies: deflected jet printing, binary jet printing.

Deflection printing

Deflection printing technology has been commercialized since the early 1970s, and it may be the most developed technology used in the production environment. Although the principle is quite simple, many control circuits have been combined for many years to ensure reliability and ease of use.

The ink was applied to the nozzle after pressurization, forming an ink flow of about 20 M/S. There is a piezoelectric device behind the nozzle. When the voltage is applied, the device will generate displacement. This displacement will disturb the ink flow. If the frequency of the electrical signal applied to the piezoelectric device resonates with the ink jet frequency, the ink flow will break into The same size, the same pitch of ink droplets. In the position where the continuous ink flow breaks into a series of ink droplets, there is a charging electrode. If the frequency of the pulse voltage on the charge electrode is the same as the frequency at which the ink stream breaks, each droplet will be charged with the corresponding charge. The ink drops continue to move past a pair of deflector plates. The voltage on the deflector plate is constant (for example, +/-5KV), forming an electrostatic field. Under the effect of the electrostatic field, the charged ink drops respond to the direction of one of the deflector plates according to the amount of charge they have. The amount of deflection. Finally, the ink droplets pass through the air and land on the surface of the printed object that passes through the print head. The uncharged ink droplets are not deflected and are collected in the recovery tank at the bottom of the spray head and finally recirculated to the nozzle through an ink reservoir.

Continuous printing

Thus, approximately, the pattern of ink jet printing corresponds to the pulse voltage applied to the charging electrode. The actual process is not so simple.