In the process of printing, the most basic
requirement is that the rules should be positioned accurately. I believe you
all know the importance of this. Let's
take the printed cover as an example to discuss the matters that should be paid
attention to in printing.
For book printers in china, when
printing cover the printing color is required to be stable; in addition, due to
the post-press processing process often covered film, UV glazing and other
special processes, so the rules of stability requirements are higher.
The importance of rules
1. hot stamping rules
The hot stamping content of the cover is
generally not intermingled with the printed content, but the hot stamping
content and the printed content have a certain corresponding relationship, so
the rule edge of hot stamping is the rule edge of printing, so as to ensure the
consistency of the hot stamping position of the same batch of live parts.
2.The rules for UV
Book
printers in china, rules for UV and the rules for
the light version must be the same. UV need on the smooth oil of the graphic
and text content and printing content part of the requirements. Cover paper
will sometimes use more loose special paper, printing is very easy to deform,
so printing rules and UV glazing process rules must be unified. If there is a
phenomenon of jumping rules in the printing process, the UV must be carefully
classified according to the situation of jumping rules in the light of the
printing, in batches to light up, and adjust the position of the UV light
version.
3. stamping rules
If the post-press process needs to be the
same position of a certain print the same content of two special process
superposition. And this requires that the overfitting error be less than 0.01
mm, so hot stamping rules, punch rules and printing rules must be consistent.
4.UV light and embossed
Generally, embossed will be done after UV.
The error of the UV glazing process may make the UV glazing misalignment less
obvious due to the bumping of the convex content.
Attention to cover printing
Usually, book cover used paper quantitative
in 157 g/ square meters above, special paper quantitative in 135 g/ square
meters above. Because the paper is thicker, especially the change of water
absorption of special paper when printing press is larger, the deformation of
paper in printing is larger, and the accuracy of regular drawing paper
positioning is particularly important.
Because the same pattern on the cover may
require two or three post-press processing, we should try to make the content
that needs to be post-press processing close to the regular edge, so that the
post-press positioning of the edge gauge position and printing edge gauge
position consistent and accurate.
When cutting paper, it is required to be
accurate, neat, small error, and the cutting position of the mouth and the edge
of the edge gauge should be standardized and neat, so as to ensure the correct
positioning of the rules when printing the cover.
book printers in china need to control the
printing process strictly. One is to ensure ink balance, in the premise of
ensuring printing quality, the smaller the amount of water required is better;
the other is to control workshop temperature and humidity, temperature 20~25℃,
humidity 60%~70%; third, in the printing process, side gauge drawing paper to
be stable, bottom gauge to be stable; fourth, the whole batch of cover color
should be consistent.
In fact, the implementation of post-press
processing can not be separated from the early plate making and design, but
also from the precise control of printing links, but also from the strict
control of the accuracy of the rules when the post-press process special
treatment. Only these three aspects have been done to ensure the quality of
post-press processing.