Problems Caused By Paper Curl; Relationship Between Paper Grain And Curl; Correcting Paper Curl - Canon imagePRESS C1+ User Manual

Problems Caused by Paper Curl

If paper jams or poor print quality occur when paper is fed from the stack bypass or paper deck, paper curl
is often the cause. The paper stiffness, direction of curl, and amount of curl have a strong influence on how
well the paper is transported through the machine. If paper is curled, always adjust the curl amount to the
appropriate level as described below.

Relationship between Paper Grain and Curl

Paper stiffness depends on the direction of the paper grain. Paper tends to curl in direction parallel to the
grain.
Low tendency
to curl
High tendency to curl
When using LTR or smaller paper sizes we recommend using paper with a grain parallel to the long edge
(A). For paper sizes larger than 11" x 17", we recommend using paper with a grain parallel to the short edge
(B).

Correcting Paper Curl

In order to prevent problems resulted from paper curl, it is necessary to uncurl paper appropriately.
The amount of curl that may cause problems depends on the paper type and thickness. Refer to the graphs
below to correct the paper curl so that it is within the acceptable range, and then reload the paper.
IMPORTANT
For small and thick paper such as postcards, the difference between the amount of inner and outer curl
must be adjusted to less than 5 mm in addition to the conditions given below.
Transport
Direction
Long Grain
A
Amount of Curl: 1 mm
Amount of Curl: 7 mm
Short Grain
High tendency
to curl
B
Low tendency to curl
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