Xerox DocuColor 5000 Decurler Adjustment

Version 1.0

April 2007

DocuColor 5000

Decurler
Adjustment

©

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Table of contents

Table of contents

Decurler Adjustment 1-1

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

Decurler paper path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Decurler A-D Profile settings . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Decurler A-D Profile procedure. . . . . . . . . . . . . . . . . . . . . . 1-5

Custom Decurler Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Entering values in the Custom Decurler Profile fiel ds. . . . 1-11

Creating a Custom Decurler Profile . . . . . . . . . . . . . . . . . 1-14

Additional Custom Decurler Profile examples . . . . . . . . . . . . 1-23

Custom Decurler Profile example 1 . . . . . . . . . . . . . . . . . 1-23

Custom Decurler Profile example 2 . . . . . . . . . . . . . . . . . 1-30

Custom Decurler Profile example 3 . . . . . . . . . . . . . . . . . 1-36

DocuColor 5000 System Administration Guide

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Table of contents

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DocuColor 5000 System Administration Guide

Decurler Overview

1. Decurler Adjustment

TIP: Please read all the Decurler information before using the

Custom Decurler Profile 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 due to the toner plastification effect on the paper
surface. The system tries to reduce this by using mechanical
devices within the paper path called Decurlers.

Paper curl is caused by many variables, includ ing, 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 set tings t he machin e automat ic ally
sends paper through the proper Decurler:

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

• A, B, C, and D settings: Preset Decurler settings, which are
manually selected as an alternative to the System Default
setting. S ee “Decurler A-D Profile settings” on page 3.

IMPORTANT! 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 image density ratio and the printer’s humidity values,
only.

DocuColor 5000 Administrator Guide

1-1

1. 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 A-D Settings. In
those cases, use the Custom Decurler Profile feature to
compensate for paper curl in your pri nts. Custom Decurler Profile
settings are based on job type and image density ratio. These
settings are manually entered.

IMPORTANT! If a Decurler profile is changed, it remains at that

setting until changed again manual ly . As an example, if you decide
to use the B Decurler setting, the setting will remain at B until you
change it to another setting.

NOTE: 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 that same file. This is especiall y 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 Tray Properties scr een (A-D settings), or based on
entries made on the Decurler Profile screen. The degree of
pressure is applied independently to the upward and downward
Decurler arms.

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DocuColor 5000 Administrator Guide

Decurler A-D Profile settings

If paper curl is a problem, using one of the preset Decurler 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 still may not result in
satisfactory performance.

NOTE: 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 image density ratio and the printer’s humidity values,
only.

1. Decurler Adjustm ent

Visit the www.xerox.com

web site and refe r to th e lat e s t
Recommended Materials List (RML) for your DC 5000 digit al
press:

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

• View the recommended Decurler A - D Profile settings for

particular paper types.

The following table shows examples of the Decurler A - D Profil e
settings for particular stocks, which were taken directly from the
Recommended Materials List for the DocuColor 5000:

Decurler A - D Profile settings examples

Paper T ype 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# T ext

A
B
A
A

NOTE: The settings recommended in the “Recommended
Materials List for DocuColor 5000” were developed from testing a
wide range of paper samples, toner area coverages, and
environments. The outcome of this testing is the preset
parameters shown in the list, and these parameters refer to how
particular papers interact with the digit al press decurling system.

If the System Default setting is not correct ing curl, then you can
use one of the Decurler A - D Profile settings, See “Decurler A-D

Profile procedure” on page 5. For example:

• If the System Default is not correcting curl, select Decurler

Profile A.

• If Decurler Profile A is not correcting curl, select Decurler

Profile B.

• If Decurler Profile B is not correcting curl, select Decurler

Profile C.

DocuColor 5000 Administrator Guide

1-3

1. Decurler Adjustment

• If Decurler Profile C is not correcting curl, select Decurler

Profile D.

• If System Default and Decurler Profiles A, B, C, and D do not

correct curl, you can use the Custom Decurler Profiles. See

“Custom Decurler Profiles” on page 8.

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DocuColor 5000 Administrator Guide

Decurler A-D Profile procedure

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

1. At the controller, logon as Administrator.

a. Select Logon.
b. Enter the Administrator password.

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

c. Select [OK].

1. Decurler Adjustm ent

DocuColor 5000 Administrator Guide

1-5

1. Decurler Adjustment

2. Select the appropriate tray.

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DocuColor 5000 Administrator Guide

1. Decurler Adjustm ent

3. Select a Decurler A-D Profile setting.

a. From the Decurler Profile menu, select a Decurler A-D

Profile setti n g.

b. Select OK to activate the selected Decurler A-D Profi le

setting.

4. Run the same print job again and check the output for curl.

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 Decurler A - D Profile settings for

particular paper types.

DocuColor 5000 Administrator Guide

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

using that specific Decurler setting.

b. If the curl is still persistent, try anot her Decurler A-D

Profile setting.

c. If the curl continues after using each

Profile setting, continu e to the Custom Decurler Prof ile
procedure. See “Custom Decurler Profile s” on page 8.

Decurler A-D

1-7

1. Decurler Adjustment

Custom Decurler Profiles

While the system is programmed to correct for curl under most
conditions, there may be instances where the pr e programmed
settings (System Default and A-D) may not meet your curl
requirements. Using Custom Decurler Profiles allows you to enter
an image density ratio range to help eliminate curl. Custom
Decurler Profiles are based on image density ratio and humidity
values, only.

NOTE: The examples that follow are designed to give you an
understanding of programming the Custom Decurl er Profile 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 a Cust om Decurler Profile
is determining the image density ratio on the curled paper. A
sampling of image density ratio on some typical customer
documents follows.

NOTE: The following image density ratios have been measured
using the particular application’s tools which created them. If you
do not have access to an application’s tools, which measure
image density ratios, make your estimate using the following
examples as a guide. Your estimates will be used when entering
Custom Decurler Profile values, which is expl ained later in this
section.

Image Density Ratio examples

Carousel Horses Bolivar Ltd. Dunn Report

Image Density Ratio per Color Image Density Ratio per Color Image Density Ratio 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 5000 Administrator Guide

1. Decurler Adjustm ent

Image Density Ratio examples (continued)

Upholstery by Morris Alpine Nursery Tulips

Image Density Ratio per Color Image Density Ratio per Color Image Density Ratio 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 curled downward
(“bridged”).

NOTE: 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 image density ratio and the printer’s humidity values,
only.

DocuColor 5000 Administrator Guide

1-9

1. Decurler Adjustment

Light, Medium and Heavy curl refer to the 2 mm (Light), 6 mm
(Medium) and 10 mm (Heavy) curl selections in the Downward
and Upward fields of the Custom Decurler Profile window.

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

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DocuColor 5000 Administrator Guide

Entering values in the Custom Decurler Profile fields

IMPORTANT! It is important to understand that when entering

image density ratio values within the Decurler Profile Properti es
window that the maximum allowed entry is 100%.

When determining what values to enter, do not total all CMYK
image density ratios, but instead determine the largest CMYK
image density ratio value. Take a look at the following examples
for further explanatio n:

• If your job contains image density ratios of 100% cyan, 100%

magenta, 100% yellow, and 100% black, the maximum image
density ratio 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 image density ratios of 50% cyan, 50%

magenta, 50% yellow, and 50% black, the maximum image
density ratio value is 50%. If your job cont ains 50% cyan, 10%
magenta, 10% yellow, and 10% black, the maximum value is
still 50%.

1. Decurler Adjustm ent

• Consider the Carousel Horses image density ratios shown

below . When entering image density ratio values to control
curl, you will use the black 30.5% value, not the combine d total
of all CMYK values.

Image Density Ratios

Carousel Horses

Black 30.5%
Magenta 28.1%

DocuColor 5000 Administrator Guide

Cyan 23.8%
Yellow 29.5%

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