Canon BJC 7000 - Manual (Page 34)

o Envelopes made with special coated paper or deeply embossed paper.
o Envelopes using peel-off sealing strips.
o Envelopes in which letters have been enclosed.
When you are ready to print on envelopes, follow these steps to stack envelopes
in the sheet feeder. (You can also manually feed envelopes one at a time.)
1
Prepare the
envelopes.
o Arrange the stack of envelopes on a firm surface and press down
firmly on the edges to make the folds crisp.
o Press all the way around the envelopes to remove any curls and to
expel air from inside the envelopes.
o To remove curling from envelopes, hold the edges of the envelopes
diagonally and bend gently.
o Make sure any curls are removed from the flaps of each envelope.