Hi everybody! Im Miriam Felton. Ive been a knitwear designer for more than a decade, and in my time Ive worked with MANY yarns. The infinite variety of fiber content, ply structure, and twist means that there is a yarn out there that is perfect for every project (or if not, you can spin it yourself). I recently started a podcast called YarnStories where every episode we talk to a producer of yarn or fiber, and then we talk to an expert about the sheep breed, the fiber properties, or the yarn structure. Between me and my experts on the podcast, weve had a lifetime of experience with fiber, but to save you the trial and error that weve gone through, heres a little primer about the basic types of fiber and their properties.
Fibers can be classified into three types; Protein Fibers, Cellulose Fibers, and Man Made Fibers. Protein fibers come from animals (insects included), cellulose fibers come from plants, and man made fibers usually come from petroleum products.
Man Made Fibers
The man made fiber youre most likely to encounter in your yarn is Nylon. Nylon was developed in the 1930s, and was used as a substitute for silk during wartime to make tents and parachute cords. Nylon is made from petroleum byproducts (plastic) that is extruded as a fiber and then spun like any other fiber. You can watch the process of making Nylon by hand here:
Nylon gives strength to a blend, but too much can cut the natural fibers and leave you with a less-durable yarn. Nylon is super strong though, so a little will go a long way. With just 10-20% nylon in a blend you will hardly notice it, but it does wonders to make the yarn more durable.
The most common of the cellulose fibers is cotton. Cotton has been spun and bred for thousands of years. Cotton is the fluff that surrounds the seeds of the pod produced by the cotton plant, and over the years of cotton fabric production, cotton has been bred to produce whiter and whiter fluff. But did you know that cotton is naturally colored? There are browns and greens, and nearly red-oranges. Sally Fox (http://www.vreseis.com/) has been working for the last few decades to breed the natural color back into cotton.
Cotton is curious as its stronger when its wet than when its dry. Cotton can be used for any number of projects with just a little planning. Cotton is HEAVY and has no bounce (also called memory). So if youre going to knit a sweater out of it, you have to plan for the way the yarn will hang or else youll end up with a tunic or a dress instead. For any kind of garment where you want that drape and hang, its perfect. You can also mitigate the no-memory problem by working it in a stitch that is very structured.
Linen comes from the flax plant (not the same flax plant that makes the seeds you find in all health foods, but related). Flax grass is beaten and soaked and broken down until just the bast fibers remain behind. Its stronger than cotton, but less elastic. Its not quite as heavy though, so you it makes wonderful sweaters and garments. Linen is one of my favorite fibers to find in a blend, since it lends a crisp hand to any other fibers its mixed with. Linen (in a blend or by itself) makes wonderful tees and tanks, or even shawls.
Bamboo fiber can be made in a couple of different ways, the crispier version is made like linen, taking the bamboo grass and breaking it down until the bast fibers are all thats left. The other way is more similar to Rayon. Where the bamboo serves as the wood pulp which is processed and extruded. The linen-like bamboo is a great substitute for linen and behaves in the same way, while the extruded bamboo is more like Rayon, lending a drape and a silky hand to the finished fabric.
Rayon (aka Viscose, Lyocell, or Modal) is a hybrid of a cellulose and man made fiber. Its made initially from wood pulp, cotton, or other plant material, but the cellulose is broken down and then forced through a spinneret to make fiber. So while it initially comes from a plant, the extrusion process is what makes it into a man-made fiber.
Thats it for Part 1 of Fast Fiber Facts! Check out Part 2 (coming soon) for info on Protein fibers like wool, camel, alpaca, and more!
If youd like to learn more about the yarns you love before they reach your hands, please do check out YarnStories Podcast, or subscribe in your podcatcher of choice. You can check out Miriam Feltons patterns on Ravelry, and hertutorials on her site and on YouTube.