(under subclass 158) Processes including a treatment of fibers prior to addition of a nonfibrous medium to a fibrous slurry, which so conditions the fibers that the medium will coat or impregnate them upon addition to the slurry.
(1) Note. The treating agent usually imparts to the fiber an electrostatic charge opposite in polarity to that of the coating medium.
(2) Note. The processes of this subclass are to be distinguished from coating of fibers by adding a precipitating agent to a fiber slurry after the nonfibrous coating medium has been associated with the slurry.
(3) Note. Most of the patents in this subclass are cross references from subclasses 158 through 181, since in processes of the type under consideration, the nonfiber
additive is usually specifically identified in the claims.
