HP LaserJet Series II and III Printers - Paper Curl or Wave
ISSUE: Pages printed on an HP LaserJet II or III series printer will not stay flat.
SOLUTION: Different printer designs will yield different paper curl (or other deformation) characteristics, and there is little that can be done to modify a given printer design. However, print media (paper) characteristics significantly contribute to the amount of resulting curl. Actions that can be performed to reduce curl are as follows:
Turn the paper over in the input tray. Paper has more of a tendency to curl when heated on one side, as opposed to the other. Some paper packages (reams) have an arrow indicating the preferred printing side. Experiment to determine which orientation yields the least curl.
Try a different output paper path (if available for the available printer). Using the "face-up" output path may yield more acceptable results than using the standard "face-down" output tray. The face-up output path is out the back on the HP LaserJet II, IID, III, IIID, IIISi, 4L, 4ML, 4P, 4MP, and 4Si printers, and out the front on the HP LaserJet IIP, IIP Plus, and IIIP printers.
NOTE: The HP LaserJet 4 and 4M printers have no alternate output paper path.
Protect the paper from adverse environmental conditions prior to use. Once paper has been removed from its packaging (ream wrap), it will become conditioned to its surroundings. Paper designed for laser printing has an initial moisture content of 4-6% which is maintained as long as it is stored properly. Once the paper is removed from its packaging, it will either tend to dry out (in a relatively low-humidity environment) or absorb additional moisture (in a relatively high-humidity environment). Excess moisture in the paper will tend to increase the amount of curl, similar to the results of using a steam iron verses a "dry" iron on clothing.
Try a different type or brand of print media (paper). Not all paper is designed for laser printing, primarily due to differing characteristics. Some paper sold as "suitable for use in laser printers" may not yield acceptable results in a specific application.
Best printing results (including paper curl) are usually obtained by using a high-quality xerographic (or photocopy) paper from a reputable manufacturer. Keep in mind that some types (or brands) of paper may suffer from inconsistent manufacturing and handling processes, resulting in one package that yields desirable results while another yields excessive curling (and possibly other printing problems).
Much of the paper curl induced by the laser printer's fusing process will tend to relax within the first 24 hours following printing. However, the leading edge of the page (up to .75 inches on some printers) does tend to remain in contact with the fusing roller for longer periods of time, resulting in more permanent curl at this point on the page. The printer's design removes much of the curl induced by this phenomenon, but the curl at the leading edge of the page may look different (and remain more permanent) than any curl in the remainder of the printed page.
NOTE: For more information regarding print media specifications and usage, please consult the printer's User's Manual and the HP LaserJet Printer Family - Print Media Guide (
http://www.hp.com/support/ljpaperguide).
SUMMARY: Paper curl is the result of both the heating process used to bond the print image (toner) to the paper and the path the paper must negotiate through the printer. Most desktop laser printers, including the HP LaserJet printers, fuse (or melt) the toner image onto the surface of the paper using a hot fusing roller. The paper is fed between this hot roller and a soft "pressure roller" which provides the necessary heat and pressure to permanently bond the print image to the page.
Though this fusing process (using rollers) provides a low cost, laser-printing solution, it is not without consequences. Similar to the effect of a clothes iron on fabric, heating paper while it is in contact with fusing rollers tends to induce some amount of curl in the paper. And, if the heated paper is subjected to subsequent bends in the paper path while it is still hot, this, too, will tend to cause other paper deformations. Smaller laser printers (such as the HP LaserJet IIP, IIP plus, and IIIP printers) tend to yield more pronounced paper curl than larger printers--due to smaller fusing roller diameters, their compact design, and more aggressive paper paths.
Håber det kan bruges - som du kan se kan det nogen gange hjælpe at vende papiret... Jeg trode det var lågn med det virkede på en gammel laser printer - det var dog en canon printer.
Held og lykke
mvh Benjamin
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