The granular indigo is processed by spray drying the slurry of acid washing indigo with additive, it has advantages of:
Free of dust or little flying dust. The granules have certain mechanical strength, and don' t create dust easily, so it can improve the working environment and sanitary condition.
Good flowability, which is beneficial to the automatic measuring and operation.
Good wettability and dispersibility, don' t agglomerate or aggregate in use, and is convenient for preparing dye liquor.
Good storage stability, and don' t absorb moisture easily, and has not electrostatic adsorption phenomenon.
It can also ensure the homogenic color and brilliant color light in printing and dyeing.
|Appearance||Homogenic dark blue granules|
|Color light||similar as the standard sample|
|Strength||equal to 100 percent of standard sample|
|Content of ferric ions, ppm||≤ 300PPM|