How is 21S+32S Colored Composite Yarn produced?

1. Raw material preparation
To produce 21S+32S Colored Composite Yarn, you first need to prepare two different counts of primary color yarns, namely 21S and 32S yarns. These yarns are usually made of different fiber materials, such as cotton, polyester, nylon, etc. The specific choice depends on the final use and performance requirements of the product. When selecting yarns, you need to consider their strength, wear resistance, color and other properties to ensure the quality of the final product. Before formally compounding, these two yarns need to be pretreated. Pretreatment includes steps such as cleaning, drying, and impurity removal, the purpose of which is to remove oil stains, impurities, etc. on the yarns and improve their cleanliness and quality. At the same time, pretreatment can also soften the yarns, making them easier to carry out subsequent compounding operations.

2. Dyeing process
In order to make the yarns present rich and colorful colors, dyeing processes are required. During the dyeing process, it is necessary to select appropriate dyes and dyeing methods to ensure the uniformity and stability of the yarn color. Common dyeing methods include dip dyeing, pad dyeing and spray dyeing. During the dyeing process, parameters such as temperature, time and dye concentration need to be strictly controlled to obtain the ideal dyeing effect.

3. Composite process
The composite process is a key step in the production of Colored Composite Yarn. In this step, two yarns of different counts need to be composited to form a composite yarn with two different thicknesses and colors. The composite process can be done in a variety of ways, such as the doubling method, the core-spun method, the lamination method, etc. Among them, the doubling method is one of the most commonly used methods.

In the doubling method, the two yarns are first placed on the two feeding rollers of the doubling machine, and the yarns are stretched and fed into the twisting zone by the rotation of the rollers. In the twisting zone, the two yarns are twisted together to form a composite yarn. By adjusting the speed of the rollers and the twisting parameters, the twist and tightness of the composite yarn can be controlled to obtain the ideal composite effect.

4. Quality control
In the production process, quality control is a key link to ensure product quality. For 21S+32S Colored Composite Yarn, quality control mainly includes the following aspects:
Yarn quality inspection: Yarn count inspection: Use appropriate tools or equipment to measure the yarn count to ensure that the yarn count of 21S and 32S is accurate. Check the uniformity of the yarn count to avoid obvious uneven thickness. Yarn color inspection: Check whether the color of the yarn is uniform, without obvious color difference or color spots. For dyed yarn, check whether the color is firm and not easy to fade. Yarn strength inspection: Test the strength of the yarn through a tensile testing machine to ensure that the strength of the yarn meets the production requirements. Record the breaking strength and elongation of the yarn to evaluate the mechanical properties of the yarn. Yarn defect inspection: Use electronic testing instruments to check the defects in the yarn, such as thick sections, thin sections, cotton knots, etc. According to the product use and quality requirements, set reasonable defect control standards. Yarn uniformity inspection: Use a spinning test machine to test the uniformity of the yarn and evaluate the density and strength distribution of the yarn. Ensure that the yarn maintains uniform quality throughout the length. Yarn fiber composition inspection: Use chemical reagents or spectrometers and other equipment to detect the fiber composition in the yarn to ensure that the fiber type, content, etc. meet the production requirements. Yarn appearance inspection: Observe the appearance of the yarn with the naked eye to check for defects such as oil, impurities, and hairiness. Check the smoothness and surface quality of the yarn to ensure that the yarn looks neat.
Finished product inspection: After the composite yarn is produced, finished product inspection is required. This includes checking the color, twist, strength and other indicators of the yarn, as well as the appearance quality of the yarn. Only finished products that meet the requirements can be shipped out of the factory for sale.

The production process of 21S+32S Colored Composite Yarn involves multiple links such as raw material preparation, dyeing process, composite process and quality control. Through the careful control and management of these links, high-quality and brightly colored composite yarns can be produced, providing a rich selection of colors and textures for textile products.