Xerox DocuColor 7000AP, DocuColor 8000AP Decurler Adjustment

Version 2.0

September 2007

DocuColor 7000AP/8000AP

Decurler

Adjustment

Prepared by:

Xerox Corporation
Global Knowledge & Language Services
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Building 845
Webster, New York 14580

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Table of Contents

Decurler Adjustment 1

Decurler Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Decurler Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Decurler Paper Type A - D Settings . . . . . . . . . . . . . . . . . . . . . . . 3

Decurler Paper Type A - D procedure. . . . . . . . . . . . . . . . . . . 4

Decurler E Table Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Entering values in the Decurler E Table fields . . . . . . . . . . . 11

Creating a Decurler E Table Setting . . . . . . . . . . . . . . . . . . . 14

Additional Decurler E Table Settings examples . . . . . . . . . . . . . 22

Decurler E Table Settings example 1 . . . . . . . . . . . . . . . . . . 22

Decurler E Table Settings example 2 . . . . . . . . . . . . . . . . . . 30

Decurler E Table Settings example 3 . . . . . . . . . . . . . . . . . . 38

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Table of Contents

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DocuColor 7000AP/8000AP Decurler Adjustment

Decurler Overview

Decurler Adjustment

KEY POINT: Please read all the Decurler information before using

the Decurler E Table Settings (E1 - E6) procedure.

When paper is exposed to heat, the paper loses moisture and
curls toward the heat source. High toner coverage jobs tend to
curl more than low toner coverage jobs. The system tries to
reduce this by using mechanical devices within the paper path
called Decurlers.

Paper curl is caused by many variables, including, but not in any
particular order:

• The weight of the paper and whether it is coated or uncoated.

• The amount of dry ink/toner and the area being covered on a
sheet: the heavier the coverage, the greater the tendency to
curl.

• How the paper is loaded in the tray. Make sure you load the
paper as instructed on the ream wrapper.

• The atmospheric conditions of the room where the paper is
stored and where the printer is located, especially those
related to humidity and temperature.

• The heat generated during the fusing processes.

Your system is designed with several automated settings to
control curl. When using these settings the machine automatically
sends paper through the proper Decurler:

• System Default: Automatically determines the amount of
pressure needed at the different decurlers in order to reduce
the output curl of the paper.

• Paper Type A, B, C, and D settings: Preset Decurler settings,
which are manually selected as an alternative to the System
Default setting. See “Decurler Paper Type A - D Settings” on

page 3.

KEY POINT: While paper curl is caused by many variables, it is
important to understand that the preset and custom Decurler
profile settings use lookup t ables for curl control that are based on
the job’s percentage of toner area coverage and the printer’s
humidity values, only

.

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Decurler Adjustment

Decurler Paper Path

With some print jobs, the output prints still may be curled more
than you desire even after using the Decurler Paper Type A-D
settings. In those cases, use the Decurler E Table Settings
feature to compensate for paper curl in your prints. The Decurler E
Table settings are based on job type and percentage of toner area
coverage. These settings are manually entered. See “Decurler E

Table Settings” on page 8.

KEY POINT: If a Decurler profile setting is changed, it remains at
that setting until changed again manually. As an example, if you
decide to use the Paper Type B Decurler setting, the setting will
remain at Paper Type B until you change it to another setting.

KEY POINT: It is important to remember that a successful
Decurler setting used today may not be the same setting that you
would use on another day for the same file. This is especially
relevant if the room in which printer is located experiences
changes in temperature and humidity.

The Decurler has both upper and lower adjustment arms that
apply pressure to the paper based on system defaults, selections
made on the Decurler Setup screen (Paper Type A-D settings), or
based on entries made on the Decurler E Table Settings screen.
The degree of pressure is applied independently to the upward
and downward Decurler arms.

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DocuColor 7000AP/8000AP Decurler Adjustment

Decurler Paper Type A - D Settings

If paper curl is a problem, using one of the preset Decurler Paper
Type A-D Profile Settings usually eliminates the problem.
However, due to the broad range of paper variables, image
coverage, and environmental factors, these default settings may
not result in satisfactory performance.

KEY POINT: While paper curl is caused by many variables, it is
important to understand that the preset and custom Decurler
profile settings use lookup t ables for curl control that are based on
the job’s percentage of toner area coverage and the printer’s
humidity values, only.

Decurler Adjustment

Visit the www.xerox.com

web site and refer to the latest

Recommended Materials List (RML) for your digital press:

• To determine if Xerox has tested your paper type and weight

• View the recommended Decurler Paper Type A - D settings for
particular paper types.

The following table shows examples of the Decurler A - D Profile
settings for particular stocks, which were taken directly from the
Recommended Materials List for the DocuColor 8000/7000:

Decurler A - D Profile settings examples

Paper Type Decurler

Setting

Xerox Digital Color Supreme Gloss 8pt. Cover C1S

Xerox Color Xpressions +, 32 LB

Xerox Digital Color Parchment White, 24 LB.

Xerox Digital Color Elite Gloss 100# Text

A

B

A

A

NOTE: The settings recommended in the “Recommended
Materials List for DocuColor 8000/7000” were developed from
testing a wide range of paper samples, percentage of toner area
coverage, and environments. The outcome of this testing is the
preset parameters shown i n the lis t, and these p arameter s refer t o
how particular papers interact with the digital press decurling
system.

If the System Default setting is not correcting curl, then you can
use one of the Decurler Paper Type A - D settings, See “Decurler

Paper Type A - D procedure” on page 4. For example:

• If the System Default is not correcting curl, select Decurler
Paper Type A.

• If Decurler Paper Type A is not correcting curl, select Decurler
Paper Type B.

• If Decurler Paper Type B is not correcting curl, select Decurler
Paper Type C.

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Decurler Adjustment

Decurler Paper Type A - D procedure

• If Decurler Paper Type C is not correcting curl, select Decurler
Paper Type D.

• If System Default and Decurler Paper Type A, B, C, and D do
not correct curl, you can use the Decurler E Table Settings,

See “Decurler E Table Settings” on page 8.

If after using the System Default setting paper curl is still
unacceptable, select an alternate Decurler Paper Type A - D
setting:

1. At the controller, logon to the Tools menu as Administrator.

a. Press the Access button.

b. Enter the Administrator password.

NOTE: The default Administrator password is 11111. This
password may be changed to fit your needs.

c. Press Enter.

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DocuColor 7000AP/8000AP Decurler Adjustment

Decurler Adjustment

2. The Pathway Option screen opens. Select the Tools Pathway

button.

3. From the Tools Mode window, press:

a. Machine Defaults 2 tab.
b. Decurler Setup button.

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Decurler Adjustment

4. The Decurler Setup screen opens.

a. From the Paper Tray menu, select the tray that contains

the paper you are using on the job. The default selection is
Tray 1.

NOTE: If you have an optional SFM attached, Trays 3 and 4 also appear

on this screen.

b. Select the job’s stock coating: Uncoated or Coated.
c. Make a selection from the Paper Weight range menu.

d. The default Paper Type is automatically applied by the

printer for the Paper Tray, Coating and Paper Weight
values you entered. Select an alternate Paper Type from
Paper Type A through Paper Type D to change the amount
of decurling applied. As an example, if the system
automatically selects Type B, select Type C.

NOTE: The Type E settings are custom entered values that
are explained later in this sec tion. While the Type E sett ings
can be selected, they need to be programmed prior to
selection. See “Decurler E Table Settings” on page 8.

e. Touch the Close button to save your selections and return

to the Machine Defaults 2 screen.

NOTE: Touch the Reset button on the Decurler Setup screen to
return to the settings established when you first accessed the
screen. As an example, if the system automatically sel ected Type
B and you changed it to Type C, the system will return the setting
to Type B.

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DocuColor 7000AP/8000AP Decurler Adjustment

Decurler Adjustment

5. Exit the Tools Mode.

6. Run a few test prints to determine if the curl was reduced to a
satisfactory level.

a. If the curl is eliminated, continue running your prints

using the specific Decurler Paper Type A - D setting.

b. If curl remains excessive, try another Decurler Paper

Type A - D setting.

c. If the curl continues after using each

Decurler Paper
Type A - D setting, continue to the Decurler E Table
Settings profile procedure. See “Decurler E Table

Settings” on page 8.

NOTE: Visit the www.xerox.com web site and refer to the latest
Recommended Materials List (RML) for your digital press:

• To determine if Xerox has tested your paper type and weight

• View the recommended Decurl er Paper Type A - D settings for
particular paper types.

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Decurler Adjustment

Decurler E Table Settings

While the system is programmed to correct for curl under most
conditions, there may be instances where the pre programmed
settings (System Default and Paper Type A - D) may not meet
your curl requirements. Using the Decurler E Table Settings allows
you to enter a percentage of toner area coverage range to help
eliminate curl.

NOTE: The examples that follow are designed to give you an
understanding of programming the Decurler E Table Sett ings
option to obtain optimal results, but due to various job stock and
environmental conditions the manner in which you achieve the
best results may vary.

The most important aspect for creating Decurler E Table Settings
is determining the percentage of toner area coverage on the
curled paper. A sampling of percentage of toner area coverage on
some typical customer documents follows.

NOTE: The following percentage of toner area coverage
examples have been measured using the particul ar application’s
tools which created them. If you do not have access to an
application’s tools, which measure percentage of toner area
coverage, make your estimate using the following examples as a
guide. Y our esti mates will be used when entering Decurler E Table

Settings values, which is explained later in this section.

Percentage of Toner Area Coverage examples

Carousel Horses Bolivar Ltd. Dunn Report

Percentage of Toner Area

Coverage per Color

Percentage of Toner Area

Coverage per Color

Percentage of Toner Area

Coverage per Color

Black 30.5% Black 5.4% Black 10.8%

Magenta 28.1% Magenta 4.3% Magenta 8.5%

Cyan 23.8% Cyan 6.0% Cyan 8.5%

Yellow 29.5% Yellow 6.7% Yellow 7.2%

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DocuColor 7000AP/8000AP Decurler Adjustment

Decurler Adjustment

Percentage of Toner Area Coverage examples (continued)

Upholstery by Morris Alpine Nursery Tulips

Percentage of Toner Area

Coverage per Color

Percentage of Toner Area

Coverage per Color

Percentage of Toner Area

Coverage per Color

Black 11.6% Black 4.5% Black 27.8%

Magenta 11.9% Magenta 5.1% Magenta 24.7%

Cyan 11.1% Cyan 4.3% Cyan 23.8%

Yellow 11.4% Yellow 6.0% Yellow 28.8%

Determine if curl is upward (“cupped”) or downward (“bridged”).

KEY POINT: While paper curl is caused by many variables, it is
important to understand that the preset and E Table Decurler
profile settings use lookup t ables for curl control that are based on
the job’s toner area coverage and the printer’s humidity val ues,
only

.

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Decurler Adjustment

Light, Medium and Heavy curl refer to the 2 mm (Light), 6 mm

(Medium) and 10 mm (Heavy) curl selections in the Lower and

Upper fields of the Decurler E Table Settings Type E window.

KEY POINT: Paper that is curled upwards is adjusted using the
Upper values. Paper that is curled downwards is adjusted using

the Lower values.

Use the following example as a guide when determining if your
curl is Light, Medium, or Heavy.

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DocuColor 7000AP/8000AP Decurler Adjustment

Entering values in the Decurler E Table fields

KEY POINT: It is important to understand that when entering

percentage of toner area coverage values within the Decurler E
Table Settings Type E window that the maximum allowed entry is
100%.

When determining what values to enter, do not total all CMYK
percentage of toner area coverage, but instead determine the
largest CMYK percentage of toner area coverage value. Take a
look at the following examples for further explanation:

• If your job contains percentage of toner area coverage of
100% cyan, 100% magenta, 100% yellow, and 100% black,
the maximum percentage of toner area coverage value is
100%. If your job contains 100% cyan, 20% magenta, 20%
yellow, and 20% black, the maximum value is still 100%.

• If your job contains percentage of toner area coverage of 50%
cyan, 50% magenta, 50% yellow, and 50% black, the
maximum percentage of toner area coverage value is 50%. If
your job contains 50% cyan, 10% magenta, 10% yellow, and
10% black, the maximum value is still 50%.

Decurler Adjustment

• Consider the Carousel Horses percentage of toner area
coverage image shown below. When entering percentage of
toner area coverage values to control curl, you will use the
black 30.5% value, not the combined total of all CMYK values.

Percentage of Toner Area Coverage

Carousel Horses

Percentage of Toner Area

Coverage per Color

Black 30.5%

DocuColor 7000AP/8000AP Decurler Adjustment

Magenta 28.1%

Cyan 23.8%

Yellow 29.5%

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Decurler Adjustment

Within the Decurler E Table Settings Type E window, you must
enter Decurler values in ascending or descending order. In the
following example, 100% was followed by 80% and 90%,
respectively. The correct sequence would need to be 100%,
followed by 90% and then 80%.

KEY POINT: It is important to understand that if you enter values
incorrectly (not entered in ascending or descending order) your
print job will run, but the system may not re spond to curl cor rection
as expected.

Values entered incorrectly: 100%, 80%, 90%, 0%, 0%, 0%.

Values entered correctly: 100%, 90%, 80%, 0%, 0%, 0%.

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DocuColor 7000AP/8000AP Decurler Adjustment