Figure 2-6. Basic ammonia flow system
c. Cooling and Exhaust System. The cooling and exhaust system prevents excessive amounts of
heat or ammonia vapors from reaching the atmosphere of the room. The system consists of blowers
driven by a motor to remove heat and vapors from the machine enclosure. This creates a partial
vacuum within the machine, keeping the air within.
6. Operation of Diazo Processing Equipment.
The process of exposing and developing your films is important in the quality of your product. The
following paragraphs discuss the process of diazo reproduction. Following this discussion is a step-by-
step procedural guide for operating a diazo process machine.
a. Set-up. Remove your diazo foil (film) from its light-proof package. To achieve the best
possible reproduction, place your master with the image face down on the emulsion side of the film. To
help you determine the emulsion side, there is a nick located in the upper right-hand corner with the
emulsion side up.
b. Exposure. Place your master on the foil, backed up by a "slip sheet." A slip sheet is the
white separation sheet in the package between each foil. Use this slip sheet as the bottom sheet in the
exposure step of the operation to protect the foil. Figure 2-7 shows the master (image side down) on the
diazo foil (emulsion side up), with the slip sheet in place.