Dosing Sequence
Timed delivery profiles for inorganic salts regulate the rate at which reactive dyestuffs move from the water onto the fabric. An electrolyte dosing curve specifies whether the salt is added in one batch, in equal increments, or through a progressive linear or parabolic ramp. Controlling this addition prevents the dye from rushing onto the material too quickly.
Exhaustion Control
Uniformity in the final shade depends on a steady migration of color molecules. If the electrolyte dosing curve is too steep, the dye aggregates on the surface and creates splotches or unlevel patches. A gradual increase in ionic strength allows the dye to distribute evenly throughout the yarn package.
Batch Uniformity
Automation systems in modern dye houses follow the curve to ensure that every lot matches the master sample. When the electrolyte dosing curve is followed precisely, the exhaustion rate remains predictable across different machine loads. This repeatability reduces the need for expensive color corrections or re-dyeing.
Ionic Strength
Measurement of the bath conductivity verifies that the salt levels match the programmed steps of the profile. The electrolyte dosing curve ends once the maximum required concentration for full exhaustion is reached. After this point, the process moves to the alkali fixation stage.
