Latest News and Updates on Textile Auxiliaries and Dyes

Overflow dyeing machines have a maximum nominal capacity, and this nominal capacity is not suitable for all fabrics. Therefore, during production, it is necessary to determine the actual capacity of the overflow dyeing machine according to different conditions such as the thickness and width of the fabric. For fabrics of the same width, the lighter and thinner they are, the smaller their capacity is. This is because if light and thin fabrics are fed according to the nominal capacity, the length of the fabric will inevitably be too long, and the cycle during dyeing will be long, which will easily cause the fabric to knot due to disorder in the dyeing room, causing fabric spots. Read More

Disperse dyes are a type of dye with smaller molecules (molecular weight 200-500) and relatively simple structure. It does not contain strong hydrophilic groups such as sulfonic acid group so3- and carboxyl COOH. It only contains some weak polar groups such as carboxyl groups, amino groups, and nitro groups, and is a non-ionic dye with very low water activity. Read More

Reactive dyes are a type of dye that react chemically with fibers during dyeing. This type of dye molecules contains groups that can chemically react with fibers. During dyeing, the dyes react with the fibers and form a covalent bond between the two to form a whole, which improves the washing and rubbing fastness. Reactive dyes are a new type of dye. In 1956, the UK first produced the Procion brand of reactive dyes. Reactive dye molecules include two main components: parent dye and reactive group. The group that can react with fiber is called reactive group. Read More

Dyeing on an overflow machine, heating and cooling will directly affect the shrinkage of the fiber, resulting in a fold. For thermoplastic fibers such as nylon, once the fold is formed, it will be irreversible. Therefore, when dyeing, special attention should be paid to the need to slowly raise/lowe Read More

a) The semi-products before dyeing do not meet the requirements. If the dyed semi-finished product has insufficient mercerization, the mercerization will be alkali-colored, which will change the shade. For example, after sulfide dyeing, the cloth surface will be red and not black.b) Hard water is us Read More

What is suede and the difficulty of dyeing processNatural suede originally refers to animal suede leather, which is very similar to deer in length, but the suede leather is not the same as the suede usually seen, and there is no short and dense fluff.This is because the skin and hair of the animal m Read More

Due to the direct collision of dye molecules, they aggregate into larger dye aggregates (or dye associations). These larger dye aggregates are deposited on the fabric during the dyeing process, causing color stains.When dyeing:The free dye molecules will recrystallize during the heating (or cooling) Read More

The main factors affecting the dyeing process: 1. Dye properties 2. The nature and concentration of additives 3. Dyeing machine function 4.Process parameters 5. Fiber properties Read More