Supercritical dyeing equipment can eliminate the generation of waste water from the source. It does not need a drop of water, but only USES carbon dioxide and dye to make colorful fabric. After the liquid carbon dioxide is output from the pump station, it reaches the supercritical state through the extraction kettle through the heating process, "takes" the yellow from the plant turmeric placed in it, and then reaches the dyeing kettle to dye the cloth. When it passes through the separator, the turmeric dye is left, and the carbon dioxide is cooled and returned to the raw material base, and extraction and dyeing are completed in one step. It takes at least a few hours to finish the traditional printing and dyeing process in less than an hour. No sewage or waste gas; Less printing and dyeing, rinsing procedures, all raw materials can be recycled.

In order to meet the dyeing needs of bulk fiber, yarn, fur, garment and other products, according to the physical and chemical properties and appearance characteristics of fiber materials to be dyed, a special supercritical fluid dyeing kettle is designed to ensure the uniform distribution and efficient mass transfer of carbon dioxide fluid, which is an important breakthrough for promoting the application of this technology.

Dye kettle is one of the main components of supercritical dyeing equipment. Under normal pressure and temperature, the dye exists in the caldron in the form of solid. The main reason is that the supercritical carbon dioxide flow is so low that the supercritical carbon dioxide fluid cannot dissolve the dye adequately. With system pressure increased, the density of supercritical carbon dioxide increases gradually, more and more co2 from the gas to the supercritical fluid conversion, supercritical fluid ratio increasing, mass transfer driving force caused by diffusion rate increases at the same time, increase the dye solubility in the fluid, state of aggregation, single molecule state, dissolved in the fluid gradually; When the temperature and pressure continue to rise and reach and exceed the critical point of supercritical carbon dioxide, homogeneous supercritical carbon dioxide fluid appears in the system, and the aggregation state and monolayer state of the dye reach equilibrium. The dye is basically dissolved, and the fluid color deepens further with the continuous extension of time.

The process of staining supercritical carbon dioxide fluid is simple. Dyeing is usually in 15 to 35 mpa, under high pressure dyeing temperature according to the variety of fabric (or fiber) regulation, should be greater than the glass transition temperature of fiber, generally in the 80-160 ℃, can also be higher again. The dyeing time is generally 10-120min. Articles come from the Internet

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