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

800 Phillips Road

Building 845

Webster, New York 14580

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Decurler Adjustment

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

DocuColor 7000AP/8000AP Decurler Adjustment

Table of Contents

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Decurler Adjustment

Decurler Overview

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 tables for curl control that are based on the job’s percentage of toner area coverage and the printer’s humidity values, only.

DocuColor 7000AP/8000AP Decurler Adjustment

Decurler Adjustment

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.

Decurler Paper Path

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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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.

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	A

Xerox Color Xpressions +, 32 LB	B

Xerox Digital Color Parchment White, 24 LB.	A

Xerox Digital Color Elite Gloss 100# Text	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 in the list, and these parameters refer to 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.

DocuColor 7000AP/8000AP Decurler Adjustment

Decurler Adjustment

•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.

Decurler Paper Type A - D procedure

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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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.

DocuColor 7000AP/8000AP Decurler Adjustment

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 section. While the Type E settings

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 selected Type B and you changed it to Type C, the system will return the setting to Type B.

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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 Decurler Paper Type A - D settings for particular paper types.

DocuColor 7000AP/8000AP Decurler Adjustment

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 Settings 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 particular 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. Your estimates 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		Percentage of Toner Area		Percentage of Toner Area
Coverage per Color		Coverage per Color		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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Xerox DocuColor 7000AP, DocuColor 8000AP Decurler Adjustment

					Decurler Adjustment


	Percentage of Toner Area Coverage examples (continued)

Upholstery by Morris		Alpine Nursery			Tulips


Percentage of Toner Area		Percentage of Toner Area		Percentage of Toner Area
Coverage per Color		Coverage per Color		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 tables for curl control that are based on the job’s toner area coverage and the printer’s humidity values, only.

DocuColor 7000AP/8000AP Decurler Adjustment

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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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%.

•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%

Magenta 28.1%

Cyan 23.8%

Yellow 29.5%

DocuColor 7000AP/8000AP Decurler Adjustment

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 respond to curl correction as expected.

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

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

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