To soften and mix dry materials in the presence of water or other liquid by rubbing, kneading, or rolling, thus producing a soft plastic mass. This term is used by one manufacturer, the Fitzpatrick Co., 832 Industrial Drive, Elmhurst, IL 60126, to describe a machine designed for this purpose, it provides continuous mixing of dry solids with one or more liquids by means of single or double screw-type agitators rotating in a channel.