Processes wherein artificial fibers or filaments are treated with solvent swelling or plasticizing agent which is stated or known to exert a swelling or plasticizing effect on such materials.
(1) Note. By "plasticizing" or "swelling" is meant a physical modification of the gel structure or body of the filament as distinguished from superficial softening or mere surface lubrication, for facilitating textile operation or improving the handle or feel. Such surface treatments are classified in appropriate subclasses of Class 427. The burden of proof to show that swelling or plasticizing does take place rests with Class 427.
SEE OR SEARCH THIS CLASS, SUBCLASS:
433, for swelling of an artificial fiber in connection with dyeing of the fiber.
