In flannel production, part of the wool or cotton fiber dyeing, and then blended with a part of the original color wool or cotton fiber, after blending, then spinning mixed-color wool yarn, woven fabric by shrinking, pulling finishing process. Flannel is mostly made of twill weave and plain weave. In addition to the raw materials used in wool or cotton, is generally wool or cotton-viscose blending, and in some markets, flannel to improve wear resistance, will also be added to a small amount of polyamide fiber blended into flannel.
