HP LaserJet 5/m/n HP LaserJet Printer Family - Print Media Specification Guide - Page 19
Guidelines for using envelopes - ink
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Note Guidelines for using envelopes The following table summarizes the envelope specifications that provide the best performance. Envelopes should meet the specifications for paper unless otherwise indicated. The specifications listed in this section generally apply to all HP LaserJet printers. See the support documentation that came with your printer for product-specific information. Property Basis weight Specifications 64 g/m2 to 105 g/m2 (17 lb to 28 lb). See the support documentation that came with your printer for specific information. Caliper 0.09 mm to 0.14 mm (3.6 mil to 5.5 mil) for a single-layer thickness. Surface roughness 100 to 200 Sheffield. Fusing compatibility All inks, adhesives, and other materials that are used in the envelope construction must be compatible with the heat and pressure of the fusing process. Materials must not scorch, melt, ignite, offset materials, or release undesirable emissions when heated to 205° C (401° F) for 0.1 second (0.2 second for HP color LaserJet printers). Dimensional accuracy and construction quality Envelopes must be folded within ±1 mm (±0.04 inch) of nominal size and have no more than two thickness of paper anywhere along the leading edge. All folds must be sharply creased and construction must be tight (not baggy) to avoid wrinkling. Envelopes must not be stuck together from excess seam adhesive. The envelope flap must lie flat (within 1.5 mm [0.059 inch] over the width where the adhesive is applied). Curl Envelopes must lie flat, with no more than 6 mm (0.25 inch) curl across the entire surface. Moisture content 4 percent to 6 percent by weight. Grain Different types of envelope construction might require different grain orientations for best performance, which is left to the discretion of the converter. For more information, see the support documentation that came with your printer. Packaging Protective box to prevent edge damage and maintain flatness. 2 Guidelines for using media 13