Explain the meaning of copperplate printing, offset printing:
1. Copperplate printing
Copperplate printing is the process of
photographic color separation to make a positive sheet, after the plate,
corrosion to make a copperplate. The copper plate is the opposite of the
intaglio, is the pattern of the inking part raised, and the blank part concave.
Advantages: large printing pressure, ink
saturation, thick text, background.
Disadvantages: rough texture, fine level is
not suitable for plate printing, more suitable for printing simple graphics and
text. Copper printing dot size to show the depth of the level, and the text and
background color do not add screen, to the actual printing, but also because of
the heavy pressure of copper plate, often left ink in the edge of the print.
2. Offset printing
"Lithography" and "offset
printing" are the same meaning. The printing method is to transfer the ink
on the plastic surface to the paper surface through the roller type colloidal
mold. As the rubber surface is flat, there is no concave down patterns, so the
printed paper on the patterns and patterns are also flat, no three-dimensional
sense, poor security. Offset printing requires less ink, mold manufacturing
costs than gravure.
Coated paper is not made for copperplate
printing, or for offset printing. It's just a different way of printing than printing
and crafts. It can only be said which type of paper is more suitable for which
type of printing.