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2 Answers. 1  Rayon is made from plant cellulose, but that cellulose has been rendered and reduced into it's basic chemical form. Rayon is a synthetically made fiber from those naturally occurring plant materials. 2  It's a regenerated fiber. Regenerated fibers are made by processing natural fiber materials.
Rayon is described as a regenerated fibre because the cellulose, obtained from soft woods or from the short fibres (linters) that adhere to cottonseeds, is converted to a liquid compound, squeezed through tiny holes in a device called a spinnerette, and then converted back to cellulose in the form of fibre.