| 摘要 |
In a crimped, continuous filament tow (of cellulose acetate) which has been spread and tensioned and to which a plasticiser may have been applied, constituent filaments are displaced relative to others in a longitudinal direction (so as to cause or enhance "blooming") by passing the tow between two coacting rollers driven at different peripheral speeds. At least one of the rollers has a surface configuration consisting of one or more series of continuous or discontinuous, smooth surfaced, flat valleys between continuous or discontinuous elevated portions or ridges, e.g. as provided by grooves, notches, slits, extending circumferentially around the surface, and parallel to the edge of, the roller. Top and bottom layers of filaments may be displaced relative to each other and to a middle layer. An endless belt may be urged into contact with the configured surface of one roller by an idler roller coupled to the other roller.
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