3. Profiles
Downward/Upward Values
The Downward and Upward values control a mechanism in the digital press that compensates for the curl formed in the fusing process; this is done by inducing an equal but opposite curl in the paper. It is similar to passing a sheet over a sharp radius, and thereby producing a curl in the direction of the radius.
The paper curl values that you recorded earlier from your calculations (Evaluate your print output for paper curl) determine the values that you enter for the Downward and/or Upward values.
The Downward and Upward values have three discrete set points of 10 mm, 6 mm, and 2 mm. Each category reflects the upwards or downwards curl direction and the curl depth:
•The 10 mm, 6 mm, and 2 mm columns represent the amount of reverse curl (either upward or downward) that the printer produces.
•The percentage number entered for each column represents the percentage of area coverage on the output prints.
For example, paper that is curled upwards is adjusted using the Upward category of settings. Paper that is curled downwards is adjusted using the Downward category of settings.
Values entered are shown in percentage. The percentage value represents the amount of toner coverage for that curl direction (remember: 10 mm, 6mm, 2mm equals curl depth).
Example
The following example illustrates how this works:
•Your input document is a
•Your desired output is to print it on 24 lb. (90 g/m2) plain paper, delivered face up to the output area
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