HP LaserJet 6L Pro Printer - Manual (Page 81)

EN Guidelines for using paper 79
Envelopes with double-side seams
Double-side-seam construction has vertical seams at both ends of
the envelope rather than diagonal seams. This style may be more
likely to wrinkle. Be sure the seam extends all the way to the corner of
the envelope as illustrated below.
Envelope storage
Proper storage of envelopes helps contribute to good print quality.
Envelopes should be stored flat. If air is trapped in an envelope,
creating an air bubble, the envelope may wrinkle during printing.
Card stock and heavy media
Many types of card stock can be printed from the paper input tray,
including index cards and postcards. Some card stock performs
better than others because its construction is better suited for feeding
through a laser printer.
For optimum printer performance, do not use paper heavier than
163g/m
2
(43 lb). Paper that is too heavy might cause misfeeds,
stacking problems, paper jams, poor toner fusing, poor print quality, or
excessive mechanical wear.
Note Printing on heavier paper may be possible if the tray is not filled to
capacity, and paper with a smoothness rating of 100-180 Sheffield is
used.
Acceptable
Unacceptable