HP LaserJet 1100 HP LaserJet Printer Family - Print Media Specification Guide - Page 23

Note CAUTION Printing on both sides of the paper Two-sided printing, also known as duplex printing or duplexing, can be either an automatic or a manual process. The print quality for color duplex printing has been optimized for 90-g/m2 (24-lb) and heavier paper. Automatic duplexing Automatic duplexing requires an HP LaserJet printer that is designed especially for duplex printing. See the support documentation for your printer model or duplex accessory for information about supported paper. (For example, when duplexing on the HP color LaserJet 8500 printer, 90 g/m2 to 105 g/m2 [24 lb to 28 lb] media is recommended.) Duplexing on adhesive labels, envelopes, or overhead transparencies can damage your printer. Manual duplexing Manual duplex printing, in which sheets that already have been printed are fed again into the printer, requires operator intervention. (See the software application support documentation for more information.) Hewlett-Packard recommends manually refeeding sheets only through the manual feed slot, the multipurpose (MP) tray, or tray 1. Do not refeed sheets from the paper cassette trays. Using the paper cassette trays can cause jams, misfeeds, and print-quality problems. Preparing laser-printed mailings Laser printing technology is being used by more and more postal customers to prepare mailings. Laser printers produce high-quality images; offer advantages in speed, flexibility, and size; and are the printers of choice for smaller companies and in-home businesses. Unlike offset printers, in which the ink is absorbed into the paper, laser printers use heat to fuse a plastic toner to the surface of the paper. Because of this difference, HP recommends that you use the following guidelines to produce quality laser-printed products for mailings: 1 Ensure that the manufacturer's recommended toner is used for the laser printer. Many aftermarket toners do not comply with the manufacturer's original specifications. Hewlett-Packard cannot predict or guarantee the performance of non-HP consumables in HP products. 2 Paper selection is critical. Several manufacturers have papers that are specifically formulated for their printers. For specific properties that are required for the paper used for laser-printed mailings, please contact your United States Postal Service business office. 3 Avoid preparing laser-printed sheets as folded self-mailers. The laser-printed sheets should be mailed in envelopes. The envelopes should have an edge or end seam and a minimum basis weight of 24 lb (90 g/m2). 2 Guidelines for using media 17