Kyocera KM-2560 Advanced Operation Manual page 302

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.
Label
Be sure to feed labels from the Multi Purpose tray.
For selecting labels, use extreme care so that the adhesive may not come
in direct contact with any part of the machine and that the labels are not
easily peeled from the carrier sheet. Adhesives that stick to the drum or
rollers and peeled labels remaining in the machine may cause a failure.
When printing onto labels, you must be liable for the print quality and
possible trouble.
Labels consist of three layers as
shown in the illustration. The
adhesive layer contains materials
that are easily affected by the
force applied in the machine. The
carrier sheet bears the top sheet
until the label is used. This
composition of labels may cause
more problems.
The label surface must be covered completely with the top sheet. Gaps
between labels may cause peeling of labels, resulting in a serious failure.
Top sheet
Adhesive layer
Carrier sheet
ADVANCED OPERATION GUIDE