What are the specific steps for the color fixation of hank dyed yarn

In the textile industry, Hank Dyed Yarn is highly regarded for its unique dyeing process and rich color expression. The dyeing process of Hank Dyed Yarn involves immersing the yarn in a dye solution in a skein form, and the dye gives the yarn a bright and lasting color by penetration and adhesion. However, the dyed Hank Dyed Yarn must undergo a fixation treatment to ensure that the dye can be firmly attached to the fiber to prevent it from falling off during subsequent processing and use.
Fixation treatment is of great significance in the production process of Hank Dyed Yarn. This link is not only directly related to the color fastness of the yarn, but also has a profound impact on its feel, gloss and durability. The core goal of the fixation treatment is to enhance the binding force between the dye and the fiber, so that the dye is more firmly attached to the fiber, thereby improving the color fastness and stability of the yarn.
When performing the fixation treatment of Hank Dyed Yarn, a series of key steps are usually followed:
Pretreatment: The first step of the fixation treatment is to pretreat the Hank Dyed Yarn. This process aims to remove impurities, oil stains and unfixed dyes on the surface of the yarn, while adjusting the pH value of the yarn. Pretreatment can significantly improve the permeability and binding force of the fixing agent, laying a good foundation for the subsequent color fixing treatment.
Selection of fixing agent: The selection of fixing agent is a key link in the color fixing treatment. Different types of dyes and fiber materials require the selection of corresponding fixing agents. Common fixing agents include acidic fixing agents, alkaline fixing agents and metal complex fixing agents. Selecting a suitable fixing agent can not only significantly improve color fastness and stability, but also maintain the softness and glossiness of the yarn.
Color fixing treatment: In this stage, the pretreated skein-dyed yarn is immersed in a solution containing a fixing agent. By heating and stirring, the fixing agent can fully penetrate and adhere to the yarn fibers. The parameters of the color fixing treatment, such as temperature, time and concentration, need to be precisely adjusted according to the specific dye and fiber material. During the color fixing process, a chemical reaction will occur between the fixing agent and the dye molecules and fiber molecules to form a strong chemical bond, thereby firmly fixing the dye on the fiber.
Washing: After the color fixation treatment is completed, the skein-dyed yarn needs to be washed to remove excess fixing agent and unfixed dyes, and restore the softness and gloss of the yarn. During the washing process, special attention should be paid to the water temperature and the choice of detergent to prevent damage to the yarn.
Drying: After washing, the skein-dyed yarn needs to be dried to remove moisture from the yarn and restore its original softness and elasticity. At the same time, the drying process also helps to promote further bonding between the fixing agent and the fiber, thereby improving color fastness and stability.
Quality inspection: After the color fixation treatment is completed, the skein-dyed yarn must undergo strict quality inspection. The content of the quality inspection includes color fastness, feel, gloss and durability. Through comprehensive quality inspection, potential problems can be discovered in time, thereby ensuring the high quality and reliability of the final product.