Dyed cloth, as the name suggests, is woven first and then dyed. Grey fabrics (woven fabrics, knitted fabrics, etc.) are processed by professional dyeing equipment: packaging, sewing, singeing, desizing, oxygen bleaching, mercerizing, shaping, dyeing, finishing, pre-shrinking and shaping, etc. Dyeing cloth has the advantages of being elegant, natural and crisp.

An important indicator of dyed cloth - color fastness

Color fastness refers to the ability of dyed cloth to maintain its original color under external action. After dyeing and printing, textiles sometimes need to go through other processes, such as felting of wool fabrics and heat-setting of synthetic fiber textiles; during use, they should be exposed to the atmosphere, perspiration, and subjected to washing, rubbing and ironing, etc. external effects. These will make the printed and dyed textiles fade and discolor to varying degrees. The main factors that affect the dyeing fastness of printed and dyed fabrics are felting, carbonization, chlorine bleaching, and sublimation. The color fastness of dyes or pigments on textiles is related to the chemical structure, concentration and state of the fibers and the properties of the fibers. Various test methods for color fastness have been developed by simulating various uses or process conditions.

Dyeing process:

Concentrating and bleaching removes impurities contained in natural fibers, and adds various sizing agents, emulsifiers, pollutants, etc. in the textile processing process. The existence of these impurities will not only hinder the smooth progress of the dyeing process, but also affect the wearability of the fabric. The purpose of scouring and bleaching is to use chemical and physical mechanical action to remove impurities in the fabric, to make the fabric white, soft, with good permeability, to meet the wearing requirements, and to provide qualified semi-finished products for dyeing, printing and finishing.

Original cloth preparation

The preparation of the original fabric includes checking, turning over (placement, boxing, printing) the original fabric and seams. The purpose of the original cloth inspection is to check the quality of the rough cloth, and find problems that can be solved in time. The inspection contents include physical indicators and appearance defects.

singeing

The purpose of singeing is to burn off the fluff on the cloth surface, make the cloth smooth, and prevent dyeing imbalance and printing defects due to the existence of cotton wool during dyeing and printing.

Desizing

In order to weave cloth smoothly, textile factories often feed grass on slopes to improve strength and wear resistance. The slurry on the blank will affect the absorption performance of the fabric, affect the quality of dyed products, and increase the consumption of hair dye, so the slurry should be removed before scouring. This process is called desizing.

dyeing

Dyeing is a relatively complicated process, and different quality fabrics have different dyeing processes. Cotton, polyester, chemical fiber products, blended products, etc. are different. Some will be fine with pressed salt and scrolls, some will be dyed with high heat and pressure, some will only need to be dyed once, and some will need to be dyed multiple times.

Dyeing can be done through a rolling mill, but it is also a difficult process. Because the color control of dyeing is known, in different temperatures, the stability of dyes, steam control, rolling pressure control and many other unknown things are in it.