Colored Fancy Polyester Yarn

How do manufacturers of colored fancy polyester yarn ensure color uniformity and durability during precision dyeing? Are there any special dyes or auxiliaries used?

1. Methods to ensure color uniformity
Choose the right dye:
The choice of dye should be determined according to the fiber type, dyeing process and the requirements of the final product. For example, for some synthetic fibers, disperse dyes or vat dyes may need to be selected.
Ensure that the dye has good dispersibility and solubility so that it can be evenly distributed on the fiber during the dyeing process.
Use dye dispersants:
Dye dispersants are surfactants that disperse and stabilize dye particles in water. Their main function is to reduce the mutual attraction between dye particles, prevent aggregation into large particles or precipitation, and thus maintain the uniform distribution of dyes in aqueous solution.
Commonly used dispersants include sulfonated oil, alkyl polyoxyethylene ether, sodium lignin sulfonate, etc. The selection and use of these dispersants should be determined according to the specific dye and fiber type.
Optimize dyeing process:
Control process parameters such as dyeing temperature, time, pH value, etc. to ensure that the dye can fully penetrate and evenly adsorb on the fiber.
Use appropriate dyeing machinery and equipment, such as a uniform stirring system, to ensure the uniform distribution of dyes in the dye bath.
Pre-treatment and post-treatment:
Appropriate pre-treatment of fibers, such as removing impurities, improving fiber wettability and adsorption, helps dyes penetrate better and distribute evenly.
After dyeing, perform adequate cleaning and color fixing treatment to remove floating colors and enhance color fastness.
2. Methods to ensure color durability
Use color fixing agent:
Color fixing agent is an important auxiliary agent to improve the fastness of dye fixation on fibers. They can form a stable chemical bond or adsorption layer with dyes and fibers, thereby preventing dyes from falling off during washing and use.
Common color fixing agents include amine salts, polymer quaternary ammonium salts, etc.
Optimize dyeing formula:
By adjusting the formula of dyes and auxiliary agents, and selecting appropriate dyeing process conditions, the color durability can be further improved.
For example, for some dyes that are easy to fade, the amount of color fixing agent can be increased or a special color fixing process can be adopted.
Post-finishing treatment:
Post-finishing treatment of dyed fabrics, such as waterproofing, anti-fouling, and wear-resistant treatment, can further improve the durability of fabrics and color durability.
3. Application of special dyes and auxiliaries
In the process of precision dyeing, some special dyes and auxiliaries may be used to meet specific dyeing requirements. For example:
Fluorescent brightener: used to improve the whiteness and brightness of fabrics, suitable for whitening treatment of white or light-colored products.
Environmentally friendly dyes: With the improvement of environmental awareness, more and more environmentally friendly dyes are used in textile dyeing. These dyes have the characteristics of low toxicity and easy biodegradability, which meet the requirements of green production.
Functional auxiliaries: such as waterproofing agents, flame retardants, antibacterial agents, etc., are used to give fabrics special functionality.

In post-finishing technology, have suppliers of colored fancy polyester yarn developed new treatment methods to further improve the softness, antistatic and antibacterial properties of the yarn?

Improved softness
Chemical softening finish:
Main method: Apply softener to the fabric to reduce the friction coefficient between fibers and yarns to obtain a soft and smooth feel. This method is effective and has been widely used.
Types of softeners: including paraffin, grease, stearic acid, reactive soft silicone, etc. Among them, wash-resistant softeners that can chemically react with fibers and combine firmly with them have been widely used.
Mechanical soft finishing:
Although traditional mechanical softening finishing methods (such as multiple rubbing and bending) are not ideal, modern technology improves equipment (such as using a three-roller rubber pre-shrinking machine) and optimizes process parameters (such as reducing operating temperature and pressure, speeding up the vehicle), You can also get a softer feel.
Improved antistatic properties
chemical method:
Antistatic finishing agent: The antistatic finishing agent is formulated into a working fluid, and the fabric is processed by padding or dipping followed by drying and baking. This method is simple to operate, has low cost, and can significantly improve the antistatic properties of fabrics.
Types of antistatic finishing agents: including cationic, anionic, amphoteric, nonionic and polymeric. Nonionic antistatic finishing agents such as Texnology® NW16 can form a conductive layer of insoluble polymer on the surface of the fabric to effectively guide and eliminate accumulated static charges.
Physical method:
Fiber blending: blending conductive fibers during spinning or conducting yarn during weaving to give the fabric a durable anti-static effect. However, this method is limited by the quality and spinnability of conductive fibers, and is only suitable for a small number of garments with special requirements.
Coating finishing: Use composite conductive materials for coating finishing, giving textiles excellent anti-static functions. However, this method may affect the breathability and feel of the fabric and is not suitable for intimate clothing and home textiles.
Improved antibacterial performance
Plasma surface treatment:
Technologies such as ion implantation, ion beam assisted deposition (IBAD) and plasma immersion ion implantation deposition (PIII-D) can inject antibacterial elements (such as Ag, Cu, etc.) on the surface of textile materials to form an antibacterial layer, thereby improving the antibacterial performance of the fabric. .
Advantages: Does not harm the performance of the main body material, and the antibacterial effect is long-lasting.
Chemical silver plating and vacuum silver plating:
Through chemical silver plating or vacuum silver plating technology, an extremely thin silver layer is formed on the surface of the textile, giving the fabric excellent antibacterial properties. In particular, vacuum silver plating technology can be carried out under high vacuum conditions, reducing the collision between silver atoms and gas molecules, and improving the adhesion fastness between the silver layer and the fiber.
Microcapsule antibacterial finishing technology:
The antibacterial substances are refined into tiny particles or droplets, wrapped with polymers with film-forming properties to form microcapsules, and then applied to textiles. This method can control the release rate of antibacterial agents and extend the durability time.