Cotton fabric dyed with VAT dyes mainly adopts dip-dyeing process. Cheese dyeing machine or beam dyeing machine can be selected according to the processing amount. In recent years, in order to adapt to the high quality of cotton knitted fabrics, the liquid flow dyeing machine is also used. In addition, for small batch and rapid processing requirements, ready-to-wear dyeing will increase.
The continuous pad-steaming process with VAT dye suspension is suitable for the processing of large quantities of fabrics such as overalls, overcoats and bedding, while the roll dyeing process is suitable for small quantities, especially for wide fabrics, to the tent and so on thick fabric to be able to exert the maximum function.
Anti-electrophoretic agent. In Europe, the United States and Japan are very popular in a high-level printing textiles is to use reactive dyes to dye, VAT dyes to dye discharge cotton fabrics. By the way,. The method for large-scale processing is two-phase printing, which is most suitable for direct printing of enclosures, covers, etc. .
White dye ?
Is there any white dye in the world? Before we can answer this question, we need to know the difference between dyes and pigments.
As we all know, the biggest difference between dye and pigment is that dye is transparent. It does not cover the background color or the markings that are already there. And pigments can be covered, paint and paint is made of pigments, they have covering, you can cover the background color. If understand from this angle, in fact, there is no so-called “White dye”.
The fluorescent whitening agent is close to“White dye”，Fluorescent whitening agent is a complex organic compound, which can absorb ultraviolet light and excite blue or blue-violet fluorescence. A substance adsorbed with a fluorescent whitening agent can reflect the visible light that shines on an object, and at the same time convert the absorbed ultraviolet light (wavelength of 300nm-400nm) into blue or violet visible light, blue and yellow complement each other, thus eliminating the yellow in the object matrix, making it appear white. On the other hand, by increasing the emissivity of the object to light, the intensity of the emitted light exceeds the intensity of the original visible light projected on the treated object. Therefore, the whiteness of the objects appears to increase with the eyes, thus achieving the goal of whitening and brightening.