Page 150 - DLIS006_INFORMATION SOURCES AND SERVICES

Unit 7: Translation and Reprographic Services

For this process to be effective, the printed information on the original must be carbon-based, Notes
such as the material found in pencils, carbon-film typewriter ribbons, or specially produced
ballpoint pens. However, an original can be turned into a carbon-based copy by making an
electrostatic copy of it. The final product may be a lightweight, somewhat brittle, buff-coloured
copy: a thermal spirit master; a thermal stencil master; or a transparency.

Diffusion Transfer and Stabilization Processes

Diffusion transfer and stabilization processes require that negatives be prepared, developed,
and printed. Light, specially coated paper and a developer solution are used. Because of the high
cost and time involved, these processes are not generally used for office copying.

Diazo Process

In the diazo process, the original is fed into a machine with specially coated copy paper and
exposed to ultraviolet light. Because electrostatic copiers can accommodate large sheets of paper,
diazo applications mainly include artwork and blueprints. With this method, however,
correspondence can be copied at the rate of about three copies a minute for a cost of less than a
cent a copy.

Copying Equipment and Features

Two main categories of copiers are convenience copiers and copier-duplicators:
Convenience Copiers: These are usually small, table- or desktop size copiers or may be
larger consoles; large organizations may place “convenience” copiers in many locations
throughout their building(s).
Copier duplicators: These are large machines that combine copying and duplicating
capabilities. Generally, copiers are thought of as machines that make copies directly from
an original, while duplicating machines require a master from which copies are run.
Copier-duplicators, however, do not fit into either category. These machines are hybrids
that can make copies directly from an original yet have large duplicating capabilities;
they can efficiently produce large volumes of high-quality copies that could traditionally
be produced only through the offset duplicating process.

Figure 7.2: Copier-duplicators: The AM Multigraphics TCS/System

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