Printing and dyeing technology has a long history in China, with the origins of direct dyeing, resist dyeing, and wax dyeing techniques for kapok fabrics all found in the country. For example, the blue printing that was once indispensable in the lives of ordinary people has a history of over 1300 years, based on the principle of preventing wax plate white glue printing. With the development of the machinery industry, the once manual printing methods have gradually declined and been replaced by production.Reactive printingLet's take a look at the development direction of reactive printing technology.

　　Reactive printingAmong the dyes, reactive dyes are commonly used, known for their bright colors, complete color spectrum, and ease of color mixing. They can be printed with various dyes and can also prevent dyeing. They have high solubility, are not prone to color spots, have good wet fastness; they penetrate well into fabrics, have excellent uniformity, small color difference, and good reproducibility; and they are cost-effective.

　　Regarding reactive printing methods, the main techniques used in the market are flat screen and rotary screen printing. However, as the country increasingly tightens control over energy consumption and pollution, the determination to govern high pollution and high energy consumption has also become evident. Therefore, green and energy-saving digital inkjet printing and transfer printing technologies have re-entered people's view and have made significant progress.

　　Reactive printingThe printing pattern is input into the computer in digital form, edited and processed using a computer-aided design dyeing decomposition system, and then controlled by the computer to spray ink through the nozzle, applying external force to the ink, forming color dots on the fabric to create patterns.

　　Reactive printing controls the spraying and non-spraying of the nozzle through digital technology, determining what color ink to spray, and moving along the XY direction during spraying to form the desired image and color on the fabric surface. An important technical indicator of digital printing is resolution, which refers to the number of dots per inch. Higher resolution is not always better; generally, a dpi of 360 to 720 provides clear images, and different substrates have different resolution requirements.

　　As one of the important parameters of digital printing ink, there has been considerable research and reporting on digital inkjet printing inks both domestically and internationally, and various manufacturers of inkjet printers often provide complete sets of printing inks. Here are a few main technical indicators for reference.Reactive printing1. Surface tension. The surface tension of the inkjet ink affects the formation of ink droplets, such as the break length, stability, formation speed, and quality of droplet formation, as well as the movement patterns of the droplets. If the surface tension is too high, it becomes difficult for droplets to form small liquid droplets, and the break length increases, which may affect the quality of the pattern. The surface tension of the ink is usually controlled between 2.510-2 N/m and 3.510-2 N/m.

　　2. Viscosity, like surface tension, also affects the formation of ink droplets. If the viscosity is too high, the tail of the droplet will stretch into a filament when it breaks; if the viscosity is too low, the droplets are prone to breakage. Viscosity also affects the spraying speed of droplets; if the viscosity is too high, it will reduce the spraying speed, preventing the droplets from colliding with the same point on the substrate. The viscosity of reactive printing is generally between 3 and 10 mPa·s.

　　3. Molecular particle size. Large irregular particles can lead to difficulties and instability in droplet formation, causing nozzle blockage. The average particle size used in inkjet printing needs to be less than 0.5 μm, with a maximum of less than 1 μm.

　　4. Conductivity. In inkjet printing, ink droplets rely on charge to shift, so the ink needs a certain level of conductivity. However, if the conductivity is too high, the salt content in the ink becomes problematic; excessive salt content can easily cause nozzle blockage. Therefore, the preferred conductivity of the ink is below 1000 μS/cm.

　　Additionally, it is necessary to examine parameters such as the completeness of the ink color spectrum, brightness, solubility, and color gamut.

　　The above introduces the development direction of

　　. For more information, feel free to contact us! Our company has many years of experience and looks forward to your joining.Reactive printing的工艺发展方向。如需了解更多，可随时联系我们!我公司有多年的经验，随时期待您的加入。

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