Diazo Machine, ContinuedDiazo materialstorageDiazo mastersDiazo exposureDiazo material is stored on a first in/first out basis. Before storing, mark thecontents of the package with the date received and package contents. Diazomaterials are light and temperature sensitive. Store them in a cool, dark, drylocation.Master artwork for diazo reproduction are dense, opaque images on atransparent or translucent base of paper or acetate. A commercial product,called “transparentizer,” lessens the opacity of lightweight translucentpapers. When creating the master, use shading sheets judiciously; the heat ofthe mercury-vapor lamp in the diazo machine can melt the adhesive. It willalso melt a master created using an image from a thermal copier. Placeregistration marks outside of the image area in multifoil transparencies.To expose diazo material, place the sensitized material on the feedboardemulsion side up and place the master on the material emulsion side down.Better images result from emulsion to emulsion contact. Webb belts willslowly feed the combination through the machine. There is a slightdimensional instability in diazo material that occurs as the cylinder rotates thediazo material from the heat of exposure to the dampness of the developmentprocess. The master and the material will automatically separate before thematerial enters the development area.Figure 4-6 illustrates placing a master on diazo material.Figure 4-6. —Combining a master withdiazo material to feed into the machine.4-16
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