In the current production, the leuco padding and jigger there is still a certain amount of use value, the main advantages of simple equipment, can be dyed, dark, Cheap Checkered Flags most suitable for small batch production of many varieties, but the low production efficiency, uniform poor dyeability, higher operating requirements.
Suspension padding method without reducing dye particles and dispersants by grinding mixed, made of highly dispersed suspension. Fabric evenly attached to the liquid immersed after rolling on the fiber, and then use the liquid to make reduced to the leuco dye directly on the fabric and be absorbed by the fiber, and finally by oxidation on the fiber, the dye method, said suspension staining method. This method is the dye through the core, can solve the problem of the white core.
Department of staining, suspensions continuous production, high production efficiency. Garden House Flags Wholesale As the dye suspensions rely on mechanical pressure into the fiber, thus avoiding the phenomenon of uneven dyeing the leuco dip due to rapid uptake rate.
Suspension staining process: Cheap Checkered Flags
Baptist rolling rolling suspension dye → the predrying → Drying → liquid → steaming → washing → oxide → soap boiling → washing → drying.
The fineness of the particles of the dye in the dyeing process of the suspension, higher, and usually requires between 1 ~ 2μm. In the preparation of the dye, in order to increase the stability of the pad fluid and dye penetration of the fabric, adding an appropriate amount of dispersants and penetrants, in order to prevent the dye Swimming shift, but also adding a small amount of animal or vegetable gum. In the solution of caustic soda and sodium hydrosulphite, Cheap Checkered Flags the ratio of 1:1.2 to 1.5, specific staining dye depth adjustment of caustic soda and sodium hydrosulphite dosage.
Dip dyeing liquid, can be a dip rolling or two Baptist and two rolling. Padding, fabric drying, and then padding also liquid and immediately restore the steam box, so that the dye directly on the cloth to restore. Liquid to prevent the dye particles attached to the fibers on the spalling enter, to join in the solution of the dye suspension. After restore steaming, the fabric by washing, oxidation, soap boiling, washing, drying, and to complete the dyeing process.
Five, soluble vat dyes staining
Soluble vat dyes, also known as Indy factors, most of Evolution from the vat dyes. Judging from the chemical structure of insoluble vat dye molecules in the carbonyl (> C = O) into a soluble sodium salt. According to their chemical structure, can be divided into dissolved anthracene prime and dissolved indigo pigment two categories. Cheap Checkered Flags These dyes dissolved in water, stained in neutral or weakly acidic solution, the cellulose fibers and protein fibers can dye. Soluble vat dyes on cotton fiber dyeing method is simple, stable dye, cotton fiber direct small, so its good levelness. The dye is low, the price is more expensive and only suitable for dyeing light in color.
(A) soluble restore stained oblique performance and dyeing process soluble vat dyes contained in the water solubility and molecular structure of soluble groups about the more soluble gene, Custom Made Decorative Flags and its solubility the greater, by adding electrolyte, will reduce the solubility to increase the dye upper dyed rate. Soluble vat dyes staining in two steps completed, the first step is to dye the fiber adsorption, dye; The second step is the hydrolysis of the dye on the fiber oxidation, ie, the dye color. When the fabric immersed in the dye, the dye is adsorbed and spread to the internal fiber, the dye on the fiber less, it can be added to table salt or sodium sulphate promote dye. Acids to prevent dye case, hydrolysis and oxidation of the dye in the amount of soda ash, in order to ensure the stability of the dye.
Dye on the dyed fiber in the oxidizing fluid hydrolysis and oxidation, Cheap Checkered Flags the completion of the dye on the fiber fixation, a process known as color. Garden Flags Manufacturers In this process, the hydrolysis and oxidation of the dye is at the same time in a bath. Generally as oxidant and sodium nitrite, together with the sulfuric acid composition of the color reagent, excess sodium nitrite excess nitrite, dyes containing amino and imino cause diazotization or nitrosation reaction and lead to excessive oxidation, so that the mere mention. Therefore, in the color reaction, Cheap Checkered Flags the addition should be controlled amount of sodium nitrite, temperature and time, but also the addition of thiourea or urea to prevent it.