What process is used to straighten natural fibers so they can be spun into yarn?

Carding is the correct process used to straighten natural fibers before they can be spun into yarn. This technique involves separating, cleaning, and aligning the fibers so that they can be efficiently spun into yarn. During carding, fibers are passed through a series of rotating drums covered with fine wires, which help to disentangle and smooth out the fibers, creating a fluffy, web-like material known as carded roving. This preparation is essential to ensure that the resulting yarn is consistent and of high quality.

In contrast, sewing involves joining pieces of fabric together, winding refers to the process of taking the finished yarn and wrapping it onto spools or cones, and twisting is a step that occurs during the spinning process where fibers are twirled together to form stronger strands of yarn. Each of these processes serves a different purpose in textile production and does not relate to the initial preparation of natural fibers for spinning.