Grades 3–5 · Materials & Matter
How can loose wool become felt without weaving?
Woven cloth has threads crossing in an organized pattern, but felt can begin as loose wool fibers. During felting, those fibers move among one another and become a dense, connected mat. They do not need to become long yarns first.
In the diagramFibers interlock without a woven gridloose wool fibersinterlocked felttiny surface scales affect how neighboring fibers slideWet-felting sketch; fibers tangle instead of weaving.
A wool fiber has tiny overlapping scales on its outside. These surface features make movement along the fiber differ with direction. With moisture and repeated movement, neighboring fibers can work farther into the tangle.
As the fibers migrate and interlock, the whole mass becomes harder to pull apart. A large fluffy layer can become a smaller, thicker sheet. The material stays together through many contacts throughout the network.
This is also why an unsuitable wash can shrink some wool clothing. The fibers rearrange and lock more tightly rather than each thread simply disappearing. Fiber structure helps connect the making of felt with changes in an existing wool fabric.
About this explanation
Starting knowledge: Know that wool consists of fibers and distinguish woven threads from a tangled fiber mat.
Sources
- The Woolmark Company — Wool Manufacturer AW Hainsworth & Sons