Canon LBP-5100 User Manual page 415

Remedy 2 Specify the setting for [Paper Curl Correction at Output] as follows in the printer
7
Flaps of the envelopes stick to the body.
Cause 1
Remedy
Cause 2
Remedy
7-38 Paper Problems
driver.
Specify [Front Side Correction (Minus Curl)] when the paper output to the
output tray curls as shown in the following figure.
Specify [Back Side Correction (Plus Curl)] when the paper output to the output
tray curls as shown in the following figure.
If this solves the problem, set [Paper Curl Correction at Output] to [Off].
In order to specify the setting for [Paper Curl Correction at Output], display the
[Finishing Details] dialog box by clicking [Finishing Details] in the [Finishing]
sheet.
Envelopes are inappropriate.
Replace the envelopes with those that can be used and print again. (See "Paper
Requirements," on p. 3-2)
The fixing mode is not appropriate.
Set [Paper Type] to [Envelope L] in the printer driver.
In order to specify the setting for [Paper Type], display the [Paper Source] sheet.