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DIAGONAL SEAM
A seam running diagonally from the bottom fold and corner, up to
the throat of an envelope. Frequently used in commercial open side
envelopes, as well as announcement, invitation and baronial envelopes.
DIE
A precision tool used to cut out envelope blanks, windows or other
shapes.
DIE CUT ENVELOPE BLANKS
The paper cut into the shape of an envelope before it's folded.
DIE CUTTING
Refers to a mechanical press operation used to punch a shape out
of paper.
DOT GAIN
A printing defect in which "dots" print larger than they
should, causing darker tones or colors.
DRILLING
Precision piercing of stacks of paper or envelopes. Interoffice
and bank teller envelopes are often drilled to ensure that all contents
are removed by the recipient.
DRY OFFSET (LETTERSET) PRINTING
A method of printing where ink is applied to a slightly raised plate,
transferred to a blanket, then transferred to the paper. Similar
to wet offset, but requires a coarser screen, normally 100 to 120
lines per inch. Produces printing quality higher than flexography
but lower than wet offset.
DUMMY
A hand folded mock-up of a piece of material to be printed that
has exact specifications.
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