Rendering agent dissolved in the presence of sodium hydroxide dissolved hot melt method and cold dissolution method two more to the hot melt method, the main Naphthol coupling capacity selected should be relatively strong. Discount Racing Flags Actual production, dull yarn base, the majority choice of hot melt method dissolved base, the depth is per kg of cotton yarn to absorb the amount of the base agent said,
Cotton yarn base mostly in the reciprocating jet yarn dyeing machine. Discount Racing Flags Base of the yarn after centrifuge dewatering, dehydration yarn containing liquid rate dyed shades of strict control, dyed in color or dark color should be below 70%, light-colored yarn moisture content was 100% to 120%. Personalized Decorative House Flags Conducting yarn base, the time required for controlled at 15 ~ 20min, in order to facilitate to increase production. The base temperature is 30 ~
(1) bottoming process (reciprocating yarn dyeing machine)
The string of white silk → rod → base → Wrapped → dehydration → stretch yarn, string rod.
2 bottoming process prescriptions and conditions
Rendering cotton yarn (matte) a packet (
Primer concentration of
Containing fluid after dehydration rate of 65% (dehydration residue full recovery)
The base temperature of
(B) of the chromogenic reagent and the coupling reaction of chromogenic reagent, including two kinds of color base and color salt, which color the salt can be directly dissolved in water, Discount Racing Flags coupled with the yarn color, but color-based solubility very poor, and itself rendering agent coupling capacity required under certain pH and base agent after diazotization, coupling color. Due to the different structure of the chromophore, the diazotization vary. Strong alkaline color base, along the method can be used for diazotization, weak alkaline chromophore, the inverse method can be used; Feather Flags For Sale alkaline color base in between, can be used suspension . In yarn dyeing These cutting method for diazotization of the chromophore.
The chromophore diazotization coupling color, you can. PH of the solution color is the color reagent in the coupling with the sodium salt of Naphthol important reason for good stability. Color liquid in the acidic state, and their pH values are generally in the range of 4 to 6, a few color liquid pH value in the neutral range of 7 to 8, lower or higher than color PH value, will affect the coupling reaction is carried out smoothly.
In the coupling reaction, Discount Racing Flags the concentration of color in the color bath g / L to represent the actual amount greater than the theoretical required amount of Because the actual color process, the base of cotton yarn into the color reagent, rendering agent may be a lot of shedding into the color reagent, chromogenic pH value increased, Discount Racing Flags resulting in instability of diazo compounds to break down, the color-based loss increase. Therefore, the actual production, must make excessive color reagent. Color in yarn dyeing bath continuous use, in order to make the quality and stability of the pollutants, the color bath must have a certain degree of stability, the common method by adding alkali agent, but also acid salt buffer system , so that the coupling pH value of the color liquid to be controlled in the required range. Depending on the color-based coupling pH value can be the choice of buffer system, including acetic acid – sodium acetate, aluminum sulfate, Discount Racing Flags ammonium sulfate, zinc sulfate and ammonium chloride.