Chapter – General Information 17
Results of envelope testing
HP tests many types of envelopes to determine which ones print
acceptably in an HP LaserJet printer. Some of the test results are
listed below.
l Commercial or Official envelopes (also called Business or
Regular), with diagonal seams and standard gummed flaps,
performed the most reliably.
l Envelopes with double-sided seam construction, which have
vertical seams at both ends of the envelope instead of diagonal
seams, tend to be more flimsy than diagonal-seam envelopes.
Double-side seam envelopes tend to jam or wrinkle unless the
edges are thin and sharply creased. However, a variety of
double-sided seam envelopes have performed acceptably during
testing.
l Envelopes with a peel-off adhesive strip, or with more than one
flap that folds over for sealing, must use adhesives compatible
with the heat and pressure of the printer’s fusing process. Many
varieties of this type of envelope performed satisfactorily in HP
testing; however, the extra flaps and strips can result in increased
jamming or wrinkling.
l Generally, feeding problems increase with envelope size. Larger
envelope sizes (C5, B5) cannot have a basis weight greater than
105 g/m
2
(28 lb).
l Rougher finishes such as laid, linen, or cockle can result in poor
fusing due to poor contact between the hot fusing roll and the
bumpy surface.
