In digital inkjet printing, the high-speed jetting of anti-counterfeiting ink plays a crucial role in determining whether textile substrates can successfully undergo jet printing. Therefore, the formulation of anti-counterfeiting ink must be carefully designed to ensure that its physical and chemical properties align with the optimal process parameters. This ensures smooth printing operations and delivers high-quality, visually appealing patterns on the fabric surface. Anti-counterfeiting inks used in high-speed digital inkjet printing require balanced performance to maintain stability before application and allow for seamless high-speed jetting. When the ink hits the fabric, the droplets must exhibit good wetting and absorption characteristics, which can be controlled through pre-treatment processes during fabric preparation. It is essential that anti-counterfeiting ink formulations are compatible with specific inkjet printing systems, whether they are based on piezoelectric drop-on-demand (DOD), thermal jet technology, or continuous inkjet systems. Approximately 80% of textile digital inkjet printers use piezoelectric DOD technology, while the remaining majority rely on thermal spray methods. Thus, the ink formulation must match the printer’s specifications to deliver excellent print quality—such as vibrant color and strong color fastness—while ensuring efficient and cost-effective performance. It should also provide support for any technical challenges that may arise during the printing process. Mirror ink performance and requirements The development of high-speed digital inkjet printing inks differs significantly from traditional dyeing and printing dyes or coatings. Even when using the same dye, the formulation process is distinct. Ink for inkjet printing is a high-tech product that holds a key position in modern textile printing technology. Many chemical companies are now investing heavily in research and development of inks tailored for digital textile printing. This is a creative and technically advanced field, offering printing professionals precise ink formulations that balance technical demands with print quality. Dye for digital printing Traditional textile printing pastes typically contain 30% to 50% dyes, with the rest being thinners and dispersants. In contrast, dyes and coatings used in digital inkjet printing inks must be highly pure and ground into fine particles, with particle size less than 1μm. The color strength of the dye chromophore must be very high, as the concentration of dye in a typical commercial printing ink is only around 10%. In piezoelectric inkjet printing, the maximum amount of anti-counterfeiting ink applied per channel is about 20g/m², with only 2g/m² of dye left on the fabric. This is significantly less compared to traditional screen printing, where up to 100g/m² of dye remains on the fabric, making it more than five times higher than in digital inkjet printing. Although some manufacturers use print heads derived from industrial digital printing machines, most inkjet printers still rely on print heads originally designed for the printing industry, as they tend to be more reliable under textile printing conditions. Piezo print heads offer better balance between resolution and speed, opening up new possibilities for developing innovative inks. The use of a CMYK color gamut alone is often insufficient for textile inkjet printing; many systems use six colors, and sometimes even eight, to achieve broader color ranges and more accurate color reproduction.

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