How to avoid When dyeing polyester fabric or dyeing polyester cylinder yarn, there are often uneven dyeing, and the cylinder yarn has a color pattern or a large difference between the inner and outer layers.

It’s related to the disperse dyes and leveling agents

1. the disperse dyestuff should have good dispersion and the dyeing process should be set properly;
2. the high temperature leveling agent should have excellent dispersibility and good dyeing transferability
3. high temperature leveling agent also needs to have low color change, not to affect the fabric color light, and can improve the reproducibility of dyeing.

The high efficiency dispersion leveling agent [ Sylic D2117 ] developed by us according to the above characteristics is a high temperature leveling agent with good dispersion and leveling property, high migration property and low color change, which makes the dyed fabric surface uniform, small difference between inner and outer layer of cylinder yarn, small cylinder difference and good reproducibility with high cost performance.

We will discuss some tips to avoid this situation and achieve even dyeing results.

Proper Preparation

The first step to achieving even dyeing results is proper preparation. Before dyeing, it is essential to clean the fabric or cylinder yarn thoroughly to remove any dirt, oil, or sizing agents. Sizing agents are chemicals used during the manufacturing process to give the fabric its stiffness and shape, and they can hinder the dye’s ability to penetrate the fiber.

To remove sizing agents, you can use a solution of 1 cup of white vinegar and 1 gallon of water. Soak the fabric or cylinder yarn in the solution for about an hour, then rinse it thoroughly with water and let it dry completely before dyeing.

Use the Right Dye


Not all dyes are suitable for polyester fabric or cylinder yarn. Polyester is a synthetic fiber that requires a special type of dye called disperse dye. Disperse dye is designed to penetrate the tightly packed fibers of polyester and bond with them.

Make sure to select the right type of disperse dye for your fabric or cylinder yarn. Some disperse dyes are designed for low-temperature dyeing, while others require a higher temperature. The temperature range for disperse dyeing can vary from 100 to 130 degrees Celsius, depending on the dye.

Use Sufficient Dye


To achieve even dyeing results, it is essential to use sufficient dye. The amount of dye required depends on the weight of the fabric or cylinder yarn and the desired depth of color.

As a general rule, use 2 to 4 percent of dye based on the weight of the fabric or cylinder yarn.

When dyeing polyester cylinder yarn, it is important to make sure that the dye penetrates all layers of the yarn. To achieve this, it is recommended to use a dyeing machine that can agitate the yarn and ensure even distribution of the dye.

Maintain Proper Temperature


Temperature is a critical factor in disperse dyeing. The temperature should be kept within the recommended range for the dye to bond to the polyester fibers. If the temperature is too low, the dye will not penetrate the fiber, resulting in uneven dyeing. If the temperature is too high, the fiber can melt or shrink, leading to a change in texture or size.

Make sure to use a thermometer to monitor the temperature of the dye bath and adjust the heat source accordingly. Keep in mind that the temperature can drop as the fabric or cylinder yarn absorbs the heat, so it is important to maintain a consistent temperature throughout the dyeing process.

Rinse Thoroughly


After dyeing, it is important to rinse the fabric or cylinder yarn thoroughly to remove any excess dye. Failure to rinse properly can result in color bleeding or fading over time. Rinse the fabric or cylinder yarn in cool water until the water runs clear, then hang or lay flat to dry.

In conclusion, achieving even dyeing results on polyester fabric or cylinder yarn requires proper preparation, the use of the right dye, sufficient dye, proper temperature maintenance, and thorough rinsing.

By following these tips, you can avoid the problem of uneven dyeing and achieve vibrant, long-lasting colors on your polyester fabrics and yarn.

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