(B) high temperature and high pressure dyeing process points Printable Racing Flags when dyeing polyester with disperse dye molecules is difficult to enter the fiber core, except a sealed high temperature high pressure dyeing machine through high temperature due to the close arrangement of the molecular structure of the polyester fiber porosity is extremely small, to promote fiber extruded in order to facilitate the staining, but also need to extend the dyeing time to overcome the resistance of the fiber for dye adsorption, in addition, must also try to increase the fineness of the dye particles. Beach Warning Flags For Sale At present, the high temperature and high pressure technology has been widely used in the dyeing of polyester and blended yarns, usually in confined conditions, with steam heating, pressurized to a temperature of 130 ° C staining. PH value when the stain is particularly important, Printable Racing Flags In addition, the dyeing temperature and time as well as water quality and so have a greater impact on the quality of dyeing of polyester. Usually high temperature and high pressure dyeing dye bath pH control in the weakly acidic range of 5 to 6, while adding an appropriate amount of dispersants in the dye bath. Selectable 120 ° C for the better diffusion properties of disperse dyes, coloring; poor diffusion properties of disperse dyes, dyeing need 125 to 130 ° C; individual dyeing worse dyes can increase the temperature to
Dye in a very thick layer of yarn in the high temperature and pressure yarn dyeing machine, reverse circulation, virtually the yarn into a filter layer, if the water is not good, not only caused by the light color, and will cause dye precipitation, filtration yarn on a dye spot. Should be used at high temperature and pressure yarn dyeing, soft water, in order to ensure the stability of the dyeing quality.
(C) high temperature and high pressure bobbin dyeing process example 100% polyester filament yarn, dyed light gray, winding density 0.33 ~
Scattered brown S-2RL
Scattered red S-HBGL
Disperse black D-2R
Toho salt 200ml / cylinder
98% acetic acid 200ml / cylinder (adjust the dye dissolved pH)
105 Detergent 200mL / cylinder (soap boiling)
305 Hydroxyl silicone oil (emulsion)
Liquor ratio of 1:11.
High temperature and high pressure dyeing, should avoid excessive temperature and excessive heating, flocculent and cohesion may be to prevent the disperse dyes. At elevated temperatures below