Pre- and post-treatment of ink problems in digital direct-injection printing machines

Digital Direct Printing MachineInk raw materials include dispersion/pigment ink, active/acid ink, dispersant, surfactant and other additives.

Digital direct-injection printing machine ink formulations have certain principles, one is based on customer product requirements, such as dye selection, concentration determination, and use of additives.

The second isT-shirt printerThe efficiency and compatibility of the print head is the goal, such as the ink channel, aperture, frequency of the print head, and the compatibility of the print head material.

The third is to make full use of the auxiliary equipment and devices of the industrial machine. The T-shirt printer includes a stirring device for white ink, a heat preservation device for UV ink and a filter device.

Characterization methods of inkjet printing inks: physical and chemical characterization, including particle size (particle size standard), high-frequency rheology (2 kHz to 600,000 Hz), and material wettability (surface tension).

Digital printing equipmentFor long-term characterization, attention should be paid to the shelf life, transportation conditions and customer recommendations. Ink drop observation instrument, including tube resistance, flow, nozzle interference, and movement; note that it cannot effectively characterize the performance of ink on the machine.

In the research and development of inkjet printing ink dyes, disperse dyes should solve the cyan shade in sublimation dyes, the influence of disperse blue 359 on the color gamut, the shade problem of high-energy disperse dyes and the intensity of black dyes.

The research and development of reactive dyes for digital printing equipment should pay attention to the coloring rate and fastness of No. 14 and No. 72 reactive cyan; the cost of active desalination and purification (30-40 times the desalinated wastewater); the problem of N content in the slurry, namely Development of urea-free and low-nitrogen slurry. In addition, the intensity of the dye, the development of shades, and the development of heterocyclic dyes all have an important influence on the development of dyes.

The research and development of inkjet printing paste is directed towards printing accuracy and penetration, coloring rate, quick drying and easy cleaning. However, the slurry also has the feel and fastness of the coating slurry; the N content of the active slurry, that is, the development of a urea-free low-nitrogen slurry.