What is the dyeing process used for man-made fabric while it is being manufactured?

The dyeing process used for man-made fabric during its manufacturing is known as solution dyeing. This method involves incorporating colorants directly into the polymer solution before the fibers are extruded. As a result, the color becomes an integral part of the fiber, which enhances the vibrancy and longevity of the dye.

One of the key benefits of solution dyeing is that it offers excellent colorfastness, meaning the color resists fading when exposed to light, washing, and other environmental factors. This process is particularly beneficial for synthetic fibers, such as polyester and nylon, which are commonly used in apparel and accessories.

In contrast, batch dyeing refers to a process where finished fabric or garments are dyed in large batches, which can result in variations in color. Continuous dyeing involves a continuous process for coloring fabric as it moves through a dyeing machine, often used for larger fabric rolls. Sizing is not a dyeing method but rather refers to the application of a protective coating to the fabric to improve its handling and performance during manufacture and use. Thus, solution dyeing is specifically tailored to the characteristics of man-made fabrics and ensures a more uniform and lasting application of color.