Differences in Spinning Methods

[Steve Ashton]

In very general terms yarn that is spun woolen is spun from shorter fibers that have no particular orientation. Woolen spun is usually lighter, fluffier and has more ends of the fibers sticking out sideways to the length of the yarn. Woolen yarns tend to hold more air spaces and are softer to the hand.

Yarn spun worsted is usually comprised of longer fibers that are combed and aligned more along the length of the yarn. Most of the fibers lay in the same direction and are straight. In some cases even the direction of the fibers is important. So all the cut ends are in the same direction. Worsted yarns are usually tighter with fewer fibers stitching out from the side of the yarn so appear more lustrous. Worsted fibers are usually stronger in tension, denser, and feel harder in the hand.

Most knitting yarns for sweaters are spun woolen to give a light, thicker fabric that is very insulating.
Most kilt fabric is worsted to give strength, a hard, tight fabric that holds a crease well.

Here is a link to just one of many explanations of the difference between woolen spun yarns and worsted spun yarns.

https://www.hilltopcloud.co.uk/blog/woolen-vs-worsted