Common problems in dyeing cotton fabrics: color flowers
During the dyeing process, uneven color of fabrics is a common defect, and color flowers are one of the more common problems. . Today, the editor will briefly analyze the causes and solutions of color flowers for everyone.
Cause 1: The pre-treatment is not clean
Solution: Adjust the pre-treatment process to ensure that the pre-treatment effect is uniform, clean and transparent; select penetrants and emulsifiers with excellent performance to avoid bubbling and color blooming.
Cause 2: Hydrogen peroxide remains after pretreatment
Solution : Measure the residual oxygen before dyeing, strengthen the washing process after pre-treatment, and use additives with excellent oxygen removal effects after neutralization, such as oxygen scavenging enzymes and reducing agents. If a reducing agent is used, while removing oxygen, attention should also be paid to the impact of reducing agent residue on dyeing.
Reason 3: Poor dye compatibility
Solution: Replacement For dyes, choose a group of dyes with low initial dye uptake, good dye migration, and basically similar dye uptake to match each other.
Reason 4: The amount and order of adding Yuanming powder/soda ash
Solution: Choose the appropriate amount of Yuanming powder/soda ash according to different dyes. Yuanming powder can be added before the dye, or it can be added after the dye. When the dye is added first, the Yuan Ming powder needs to be added all at once. When the dye is added later, the Yuan Ming powder needs to be added slowly.
Reason 5: The quality of production water is poor and the hardness of external additives is too high
Solution: Monitor the pH value and hardness regularly every day, and use pH buffers and chelating dispersants to soften and neutralize the water quality.
Reason 6: Dyeing condition factors
Solution: Adjustment And optimize the dyeing process, control the dyeing liquor ratio, heating speed, dye uptake rate, dyeing time, equipment operating status, etc.
In the dyeing process, there are many factors that affect the dyeing effect. In the final analysis, they are divided into three categories: pre-treatment, dyes, and dyeing conditions. Therefore, mastering and controlling the influence of these three factors, as well as the mutual influence of these three factors, is the fundamental way to suppress the color flower phenomenon. </p
