Canon imagePRESS C1+ Reference Manual page 562

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When Output Sheets Are Not Neatly Stacked in the Output Trays
Press [-] to correct the level of curl ➞ press [OK].
You can change the level of curl to suit the characteristics of the paper.
Paper curl is negated by adjusting the level of curl in the opposite direction that the paper is
curled.
After changing the curl correction level, register the duplicated paper
type in a paper drawer, stack bypass, or paper deck from the
Additional Functions screen.
For more information on registering the paper type in a paper source, see "Identifying the Type
of Paper in a Paper Source," on p. 4-35.