Ulano Rubylith Masking Film 1.02m x 10m
Rubylith is a red masking film suited for use with orthochromatic films.
Rubylith is safe for use with camera-speed darkroom films as well as indirect gelatin stencil films and diazo, diazo acrylic, or SBQ-sensitised stencil films or emulsions. Rubylith is primarily used in camera and plate-making operations for offset lithography, flexography, gravure, and screen processes where orthochromatic films and plates are used.
In 2006 Ulano re-engineered Rubylith to have a single, “Ulano Universal Tack Level.” Ulano took a fresh look at the common uses of masking film now, not those of a generation ago. The conclusion was that very few customers cut intricate designs by hand, so the need for high tack masking films was not necessary. Ulano Universal Tack Level provides the tack level most plotter customers want and simplifies the inventory.
Rubylith offers extended spectral protection suitable for plate making and contact work for masking of photo-sensitive materials with orthochromatic sensitivity, and, of course, screen process photo stencil making.
Tape a sheet of Rubylith and the artwork to the work surface in all four corners.
Cut on a hard surface, with only the artwork between the masking film and the work surface.
A light table makes a particularly good cutting surface, combining good visibility with a hard, glass work surface.
Use only a sharp cutting blade. A dull blade will tear the film causing poor edge definition.
Hold the cutting blade as nearly perpendicular to the film surface as possible in order to make straight cuts with well-formed, 90-degree emulsion “shoulders.” Angled cuts cause poor edge definition—leading to light leaks along cut edges.
Do not bear down when cutting. The emulsion is less than 2/1000 inches (50 microns) in thickness.
Excess pressure causes poor edge definition—with light leaks along cuts.
Peeling or Weeding
Do not use the film cutting blade to peel away the cut film, as that risks snapping off the very tip of the blade that does the actual cutting, thereby dulling the blade. Instead, use a separate peeling tool, preferably made of soft metal and with a blunt blade.
Filed-down tweezers or toothpicks make good peeling tools, too.
Place the point or dull blade of the peeling tool approximately 1 mm. inside the cut line on the surface of the film that is to be lifted.
Push the film away from the cut line and raise a small portion of emulsion from the polyester backing. Push the film to gradually enlarge the area of the peeled film until it can be grasped between the forefinger and the peeling tool point or blade. Peel away the film to open a “window” in the polyester through which light will pass.
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Thursday, 24 November 2022
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