Patent GB-961391-A (GB)
Title: Improvements in or relating to filaments which exhibit glowing prismatic colour effects
IPC: B44F1/14
Filed: 1962-11-20
Abstract: A film consisting of transparent or translucent material is coated on one or both sides with a clear coating material compatible with the material of the ribbon, to form an adherent coating of random uneven thickness to form random areas of different light-dispersing characteristics imparting a prismatic effect along the length of the film.  The coated film may be subsequently slit longitudinally into narrow strips.  The coating material may be a synthetic organic polymeric material and may be disturbed in its wet form to provide the random unevenness in thickness, the disturbed and uneven coating being thereafter cured.  The coating may be applied to the film as an extremely thin film of solution.  One or both surfaces of the film may be coated with a deposited metal prior to being coated with the clear coating material.  The coating of deposited metal may be formed on the film by vacuum plating.  The clear coating may be stained, dyed, pigmented or otherwise coloured before its application to the film, whereby the random areas are of differing colour intensity. Selected areas of the film may be coated with clear coating material differing in colour from coating material applied to adjacent aeras of the film.  The differently coloured coatings may be applied to the film by an appropriate printing process, such as by rotogravure impressions.  The coated film may be embossed prior to being slit. The prismatic filaments may be made by advancing the film through a coating device to provide a layer of uniform thickness of a very dilute coating solution on the film and then passing the film under a disturber roll positioned adjacent to the coating device and having an uneven surface to upset the uniformity of the thickness of the wet layer and to cause the formation of randomly disposed areas of varying thickness on the film, the thus produced coating of uneven thickness being then cured before the slitting step.  The disturber roll may be a helically grooved rod or a rod round which a wire is helically wound the rod being in either case rotated and simutaneously reciprocated transversely with respect to the advancing film.ALSO:A filament comprising a narrow transparent or translucent narrow ribbon having on one or both sides a coating of a clear transparent organic, polymeric material which is compatible with the material of the ribbon and which is adherent thereto, the coating being of random variation in thickness so that it imparts prismatic qualities to the filament may be made by coating one or both sides of a web of film consisting of transparent or translucent organic polymeric material with a clear coating material of random uneven thickness to form random areas of different light-dispersing characteristics along the length of the web of film and subsequently slitting the coated web longituddinally into narrow strips to form ribbon shaped filaments therefrom.  The coating material may be a synthetic organic polymeric material and may be disturbed in its wet form to provide the random unevenness in thickness, the disturbed and uneven coating being thereafter cured.  The coating may be applied to the web as an extremely thin film of solution of the material in a volatile organic solvent.  One or both surfaces of the web may be coated with a deposited metal prior to being coated with the clear coating.  The coating of deposited metal may be formed on the web by vacuum plating.  The clear coating may be stained, dyed, pigmented or otherwise coloured before its application to the web, whereby the random areas are of differing colour intensity.  Selected areas of the web may be coated with clear coating material differing in colour from coating material applied to adjacent areas of the web.  The differently coloured coatings may be applied to the web by an appropriate printing process, such as by rotogravure impressions. The coated web may be embossed prior to being slit.  The prismatic filaments may be made by advancing the web through a coating device to provide a layer of uniform thickness of a very dilute coating solution on the web and then passing the web under a disturber roll positioned adjacent to the coating device and having an uneven surface to upset the uniformity of the thickness of the wet layer and to cause the formation of randomly disposed areas of varying thickness on the web, the thus produced coating of uneven thickness being then cured before the slitting step.  The disturber roll may be a helically grooved rod or a rod round which a wire is helically wound, the rod being in either case rotated and simultaneously reciprocated transversely with respect to the advancing web. U.S.A. Specifications 2,974,055 and 2,979,055 are referred to.