HP LaserJet Printer Family - Print Media Specification Guide
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...smooth (do not have sharp edges. Envelope problems CAUTION High rates of jams, gray areas printing on page 11.) q Purchase envelopes that the envelope's leading edge, which enters the printer first, is straight, and has a sharp, well-creased fold. Cause Envelopes are too stiff or heavy... sure that are wrinkled, bent, or curled. The envelope must not have more than two thicknesses of paper. q Use the printer's most common causes of a pen or pencil over the envelope edges to a point at the leading-edge corners. (See the figure in your HP LaserJet printer user guide.
...smooth (do not have sharp edges. Envelope problems CAUTION High rates of jams, gray areas printing on page 11.) q Purchase envelopes that the envelope's leading edge, which enters the printer first, is straight, and has a sharp, well-creased fold. Cause Envelopes are too stiff or heavy... sure that are wrinkled, bent, or curled. The envelope must not have more than two thicknesses of paper. q Use the printer's most common causes of a pen or pencil over the envelope edges to a point at the leading-edge corners. (See the figure in your HP LaserJet printer user guide.