Dyeing and finishing refers to the process of chemical treatment of textile materials (fiber, yarn and fabric). Modern also known as printing and dyeing.Dyeing and finishing, together with spinning, weaving or knitting, forms the whole process of textile production.Dyeing and finishing include pretreatment, dyeing, printing and finishing.The quality of dyeing and finishing has an important influence on the use value of textiles.
Pretreatment of applied chemistry and physics mechanical action, removing a contains natural impurities and fiber in textile machining process of the slurry and on oil pollution and so on, make the fiber give full play to its superior quality, is the appearance of the fabric is white, soft handle and good permeability, to meet the requirements of production, for dyeing, printing and so on the next working procedure quality fabric.
Dyeing dyeing refers to the process of dyeing the dye from the dye to the fiber and forming a uniform, solid and bright color on the fiber.The chemical composition of various fibers is different, and the applicable dyes are different.Cotton fabric is mainly dyed with reactive dyes.The dyeing of polyester fabric is mainly used for dispersing materials. The commonly used dyeing methods are high temperature method, carrier method and heat dissolution method.The modified polyester fabric with anionic groups can be dyed with cationic dyes and the color is strong.Polyamide fabric is mainly used in acid dyes, and it can also be dyed with acidic dye, disperse dye and some direct dyes.Acrylic fabrics are mainly dyed with cationic dyes or disperse dyes.The fabric is dyed with reduction, vulcanization and direct dyes.It is difficult to dye polypropylene fabric, which can be stained with disperse dyes or acidic dyes after transsexual treatment.Acetate fabrics are mainly used in disperse dyes and sometimes insoluble azo dyes.
The dye and dye used for printing the textile fabrics are basically the same, mainly using the direct printing process.The absorbent capacity of synthetic fiber is low, the solid content of the slurry should be increased appropriately, and good adhesion is required.Printing method is based on screen printing.After printing and drying, the vinegar ester fiber and polyacrylon fabrics are steamed and dyed with atmospheric pressure and then washed.The polyester fabric is dried with disperse dye printing, and the high temperature in the sealed container can be evaporated, or it can be used as a normal pressure to evaporate or bake to dye the dye.Polyester fabric can also be transferred with disperse dye.Synthetic fabrics can also be used in pigment printing, simple process, but the printing of large area pattern feels harder.
The finishing process of synthetic fiber fabric is usually just drying and drawing.The synthetic fiber is a thermoplastic fiber, and its fabric can have a durable effect.Acetate and synthetic fiber are low in hydrophilicity, and have hydrophilic polymer on the fabric, which can improve the decontamination and antistatic property.After reducing and refinishing the polyester fabric with alkali, the style of silk can be imitated.Some fabrics are made of ground and hair, which are made of wool or suede.In addition, it can be soft, waterproof, oil proof, moisture absorption, coating and other functional finishing processing.