Envelope construction is critical. Envelope fold lines can vary considerably, not only between
manufacturers but also within a box from the same manufacturer. When selecting envelopes, consider
the following components:
Weight: The weight of the envelope paper should not exceed 90 g/m
(24 lb), or jamming might
Construction: Prior to printing, envelopes should lie flat with less than 6 mm (0.25 in.) curl and
should not contain air. Envelopes that trap air may cause problems. Do not use envelopes that
contain clasps, snaps, tie strings, transparent windows, holes, perforations, cut outs, synthetic
materials, stamping, or embossing. Do not use envelopes with adhesives that do not require
moistening, but rely instead on pressure to seal them.
Condition: Make sure that the envelopes are not wrinkled, nicked, or otherwise damaged. Make
sure that the envelopes do not have any exposed adhesive.
Sizes: From 90 x 160 mm (3.5 x 6.3 in.) to 178 x 254 mm (7 x 10 in.).
Chapter 4 Supported paper and other media