Olivetti d-Copia 2500MF Advanced Operation Manual page 301

Appendix-8
If paper jams occur, load fewer envelopes at once.
To prevent paper jams when printing onto multiple envelopes, do not allow
more than ten envelopes remain in the output tray at once.
Thick Paper
Before loading thick paper in the Multi Purpose tray, fan it and align the
edges. Some thick paper may still have rough edges developed by a paper
cutter on the back side. Remove any such rough edges just as with Hagaki
by placing the paper on a flat surface and rubbing the edges gently a few
times with a ruler. Printing onto paper with rough edges may cause jams.
NOTE:
If the paper is not supplied correctly even after it is smoothed,
load the paper in the Multi Purpose tray with the leading edge raised a few
millimeters as shown in the figure.
Colored Paper
Colored paper must conform to the specifications listed on the page 2 of
the Appendix. In addition, the pigments in the paper must be able to
withstand the heat of printing (up to 200°C or 392°F).
Preprinted Paper
Preprinted paper must conform to the specifications listed on the page 2 of
the Appendix. The colored ink must be able to withstand the heat of
printing. It must be resistant to silicone oil as well. Do not use paper with a
treated surface such as glossy paper used for calendars.
Recycled Paper
Recycled paper must conform to the specifications listed on the page 2 of
the Appendix; however, its whiteness may be considered separately.
NOTE:
Before purchasing recycled paper in volume, try testing a sample
to ensure that the print quality.
ADVANCED OPERATION GUIDE