Xerox DocuColor 7000AP Посібник - Сторінка 4

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Co a t e d Pa p e r s

Coated papers have binders, adhesives, and pigments applied to their surfaces on one or both sides.

As compared to Xerox Digital Color Xpressions + 24 lb, coated papers will provide improved image

quality and gloss.

Coated papers are susceptible to humidity. Image mottle (light patches in solid area) or light images

overall will occur if paper is not kept packaged in environments with more than 40% humidity. To

avoid this, keep packages sealed and store unused paper in a resealable bag.

The surface of coated paper is susceptible to scratches and fingerprints. Handle all coated stocks

carefully and avoid excessive handling. Keep all work areas clean, as dust or dirt can scratch the

surface of coated papers.

Si d e t o Si d e Re g i s t r a t i o n Co n s i d e r a t i o n s - Pa p e r St r e t c h

When running two sided printing applications side to side registration may be affected by the inherent

paper stretch that occurs as the paper passes through the high pressure and temperature nip.

Typical paper stretch for light uncoated materials is between 0.2% and 0.6% of the paper size in the

process direction. For coated materials the effect can be as high as 0.9% of the paper size in the

process direction.

As a summary, the following observations are relevant to the stretch of paper in belt-nip fusing:

1) The paper stretch problem is most apparent with coated papers. Most coated papers stretch

significantly more than uncoated papers due to the larger frictional stresses experienced by

coated stocks and softening of the paper.

2) The direction of feed with respect to the orientation of paper fibers also determines the amount of

stretch. Papers fed in the CD (grain perpendicular to process direction) stretch significantly more

than papers fed in the MD (grain parallel to process direction).

3) Increasing the basis weight decreases the stretch since less stress is experienced due to the

increased thickness.

4) The synthetic material tested (DuraPaper 10 pt) actually contracts as it passes through the fuser.

Paper stretch correction can be done using the "tools" mode registration adjustment, but front-to-back

trim mark registration may not always be possible. This is because the side-1 image expands by the

same amount that the paper stretches, thus making it necessary to expand the side-2 image by the

same distortion amount. In order to compensate for this you can use the Alignment Adjustment tool

(refer to the System Administration Guide Tools Mode Chapter). The tool will allow you to create up

to 20 custom profiles for individual paper stocks. Lead / Side registration, Perpendicularity, Skew,

and Image Magnification (Process and Cross-Process directions) parameters can be adjusted for

optimum registration performance.

For more information on Genuine Xerox Supplies, call 1-800-822-2200 in the USA and 1800-668-0133 in Canada