ABOUT PAPER
Grain
The grain of a paper is the direction in which most of the fibers lie.
During the paper-making process, the majority of the paper fibers
align parallel with one another. Depending on how the paper is cut
to its finished size, it will be either grain-long (the grain is parallel to
the longer dimension of the paper), or grain-short (the grain is
parallel to the shorter dimension of the paper).
One method used to determine the grain is to fold a sheet of paper
lengthwise, then make a crosswise fold. Compare the two folds.
Paper folds smoothly with the grain. Cross-grain folds tend to be
rough and cracked.
Another method you can use to determine the grain direction of a
sheet of paper is to tear the sheet widthwise. Paper always tears
straighter with the grain.
Grain direction is critical when running heavy-weight papers in the
5790. Heavy-weight papers must be loaded in the Paper Tray
Bypass with the grain direction parallel to the leading edge of the
sheet.
Stiffness
Stiffness refers to the rigidity, or bending resistance, of paper.
Thicker papers are usually stiffer. Papers are normally stiffer in the
grain-short direction.
In general, paper that is less than 16 lb (60 gsm) is more likely to
bunch up or wrinkle in the copier/printer, causing jams and
misfeeds. Heavier weight papers, over 28 lb (105 gsm), may have
runability problems as well as print quality defects (skips, blurs,
deletions) due to their reduced ability to bend around the transfer
drum.
Usually, reliable feeding rates can be obtained on the 5790 by
feeding lightweight paper, 16 lb (60 gsm), with the grain direction the
same as the feed direction. This will increase the stiffness. When
feeding heavier weight paper, 32 lb bond to 90 lb Index (120 to 163
gsm), the grain direction should be the opposite of the feed direction
to decrease stiffness.
Buying tip
Because 11 x 17 inch paper must be fed short-edge first, purchase
only grain-long lightweight papers, 16 lb (60 gsm). Heavy-weight 11
x 17 inch papers, 32 lb bond to 90 lb Index (120 to 163 gsm), should
be purchased grain-short.
REGAL 5790 MATERIALS USAGE GUIDE
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