Inkjet printing originated in the 1980s, initially for office word processing and later for reproduction of color pictures. Dr. Sweet from Stanford University in the United States and Professor Hert: from Lund College in Sweden explained the working principle of continuous inkjet printing, that is, a pressure wave is used to split a small ink stream into ink droplets of uniform size, and the ink droplets are selectively When the charged ink droplets pass through the electric field, the ink droplets are deflected and collected in the ink collector for recycling, while the uncharged ink droplets are directly ejected onto the printed substrate to form patterns. Called the continuous ink jet printing method (CU method), a continuous ink jet printing machine was subsequently produced. Printing textiles with reactive dye inks.
In the late 1970s, people used piezoelectric sensors to generate driving pulses on the ink cartridges containing ink, so that the ink was ejected from the holes in discrete droplets, and a lot of research was carried out, and then industrialized. This method is called on-demand. Dropping method (DOD method). Compared with the cu method, the DOD method is simpler to control, reducing the complicated ink droplet charging and ink recovery system. However, the DOD method is prone to clogging of the nozzle. On this basis, the piezoelectric principle system has been improved in the past two decades, and great progress has been made in printing speed, printing accuracy and ink droplet adjustment technology. It is the main inkjet printing technology currently used.
In 1979, Canon (Canon) invented the DOD method of the bubble inkjet method (BLI method). In 1984, the Hewlett-Packard company in the United States also invented the thin thermal bubble inkjet method (Tai method). The ink is heated to 4001, causing the hot microbubbles to grow and burst, causing the ink droplets in the nozzle to be ejected from the nozzle. This method integrates the ink cartridge with the print head, and is easy to replace when the ink cartridge runs out or the print head fails. Thermal bubble inkjet technology has the lowest cost and is widely used for printing medium and low-grade fabrics.
The first Cu printing machine was exhibited at the International Textile Machinery Association (ITMA) in 1987. At present, many factories in my country produce piezoelectric inkjet printing machines, and their nozzles are imported from abroad.
At the same time as the development of inkjet printing, the research on printing inks is also carried out simultaneously. The printing inks prepared with water-soluble dyes include reactive dyes, acid dyes, cationic dyes, etc. The printing inks made with insoluble pigments are also constantly being studied. Solid ink, hot melt or phase change ink, melts into liquid when sprayed from the nozzle, and solidifies into solid after spraying on the fabric.
