Welcome to Yarn Preparation where you will learn about “Drawing”, “Combing”, and “Roving.”
The drawing process further aligns the fibers, making them more parallel. Several slivers are blended together, in a process called “doubling,” and the slivers are then blended into a more uniform mass, in a process called “drafting.” Usually, two drawing processes are used to produce a very uniform mass composed of straight fibers.
In the combing process, a fine-toothed comb is pulled through the fiber mass to remove short fibers, entangled fibers, and small particles of trash. The result is a uniform, clean, and more lustrous sliver.
The roving process is used to prepare fiber for ring spinning. Finisher-drawn carded or combed slivers are fed into a simple roller drafting system that reduces the sliver’s linear mass, drawing it out to a size that is optimum for spinning yarn of the desired size.