What is the process flow of the dyeing machine?

1. Fabric preparation:
Inspection and selection: Inspect the fabric to check whether there are any damage, stains, etc., and select fabrics that meet the dyeing requirements. At the same time, select fabrics of suitable materials, colors, weights, etc. according to order requirements and dyeing effects.
Pretreatment: Remove impurities and slurry on the surface of the fabric to improve the uniformity and color fastness of dyeing. Pretreatment methods include desizing, scouring, bleaching, etc. For example, for cotton fabrics, desizing can remove the slurry on weaving, scouring can remove natural impurities and residual slurry, and bleaching can improve the whiteness of the fabric, providing a good foundation for subsequent dyeing.
Winding: Wind the pre-treated fabric flatly on the reel of the dyeing machine to ensure that the surface of the fabric is smooth and flat to prevent creases and dye spots during the dyeing process. When winding, pay attention to the uniform tension of the fabric to avoid being too loose or too tight.
2. Dye solution preparation:
Dye selection: Select the appropriate dye according to the material and dyeing requirements of the fabric. For example, reactive dyes are commonly used for cotton fabrics, and disperse dyes are commonly used for polyester fabrics.
Addition of auxiliaries: In addition to dyes, corresponding auxiliaries such as penetrants, leveling agents, and fixing agents need to be added. Penetrants help dyes penetrate better into the fabric fibers; leveling agents can evenly distribute dyes on the fabric to prevent uneven dyeing; fixing agents can improve the color fastness of dyes on fabrics.
Accurate weighing and dissolving: Accurately weigh dyes and auxiliaries according to the formula, and add them to a certain amount of water for dissolution. When dissolving, pay attention to stirring evenly to ensure that the concentration and composition of the dye solution are accurate. At the same time, the temperature and pH value of the dye solution should be controlled. Generally, the pH value of the dye solution is controlled between 4.5 and 6.5 to ensure that the dye can fully exert its dyeing performance.
3. Roll dyeing operation:
Loading cloth into the cylinder: Install the reel with the wound fabric on the roller dyeing machine to ensure that it is firmly installed. Then introduce one end of the fabric into the dye tank, and guide the fabric guide roller to completely immerse the fabric in the dye solution.
Set process parameters: According to the characteristics of the dye and dyeing requirements, set the process parameters of the dyeing machine, such as dyeing liquid temperature, dyeing time, fabric travel speed, fabric tension, etc. Under normal circumstances, the dyeing temperature of reactive dyes is generally 60-90℃, and that of disperse dyes is 120-130℃; the dyeing time is generally 30-60 minutes.
Run the dyeing machine: Start the dyeing machine and make the fabric reciprocate in the dyeing tank. During operation, the immersion time and movement speed of the fabric in the dyeing liquid should be controlled by adjusting the angle of the guide roller and the speed of the drive device to ensure that the fabric can absorb the dyeing liquid evenly. At the same time, monitor the temperature and liquid level of the dyeing liquid in real time to ensure the uniformity of the dyeing liquid and the stability of dyeing.
4. Post-dyeing treatment:
Washing: After dyeing, take the fabric out of the dyeing machine and wash it thoroughly to remove the unfixed dyes and auxiliaries to prevent the color fastness from decreasing. The temperature and time of washing should be adjusted according to the type of dye and the characteristics of the fabric. Generally, it is washed with hot water for 3-5 times, and then washed with cold water.
Drying: Dry the washed fabric to remove moisture and restore the fabric to a dry state. The temperature and time of drying should be controlled according to the material and thickness of the fabric to avoid deformation or damage of the fabric due to excessive temperature.
Finishing: The fabric can be finished as needed, such as softening, anti-wrinkle, antibacterial treatment, etc., to improve the feel, comfort and functionality of the fabric.
Quality inspection: The dyed fabric is inspected for quality, including color accuracy, color fastness, appearance quality of the fabric, etc. If quality problems are found, the causes should be analyzed in time and corresponding measures should be taken to improve them.
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