Digital Color Press Operator Manual

DocuColor 5252 Operator Manual
4-2
Paper and Paper Trays
For reliable digital press operation and good print quality, Xerox
recommends the following:
Store Paper: • On a flat surface. Do not store paper directly on the floor, since
that increases the possibility of moisture absorption. Paper
should be stored on pallets, or shelves or in cabinets in an
area protected from extremes of temperature and humidity.
• In a low dust area.
• In a low humidity area. Humidity is one of the most important
steps to promote proper paper characteristics. Optimum paper
storage conditions include a relative humidity of 35% to 55%.
An increase in humidity can cause paper to develop wavy
edges. This occurs because the edges absorb moisture while
the rest of the ream remains unaffected. Wavy edges can
cause jams and misfeeds.
• In an air-tight moisture proof container.
• In controlled temperature. The temperature in the room where
paper is stored can have a significant effect on how that paper
performs in the machine. Optimum paper storage temperature
is 68
o
to 76
o
F (20
o
to 24.4
o
C).
For additional paper handling information, refer to the Color
Materials Usage Guide.
Cutting and Trimming
Paper
Proper cutting of the paper is important. Mills offering paper in cut
sizes cut their papers using state-of-the-art rotary slitters on high
performance systems. Slitting and edge trimming by circular
knives with dust removal at every cutting point prevents
contamination of the paper.
Trimming papers from parent sheets to get the desired output size
may generate dust if dull knives are used. The recommendation is
to delay trimming until printing has been finalized to prevent paper
dust generation and contamination.
If preprinting is imperative, an in-house maintenance program,
including knife sharpness maintenance and dust removal with a
vacuum or air system, are key to achieving good results.