How to improve the quality and
technology of corrugated paper box printing, at present,
packaging box printing is booming, customers' requirements for product quality
are also higher and higher, how to improve the printing quality of corrugated
box has become the goal of enterprises. Here are some of the important
techniques in the exquisite printing process of cartons.
Flexography printing technique of low-gram
paper surface
When using low-gram paper to make
corrugated board face paper, there will be corrugated marks on the surface of
corrugated board. It is easy to cause the corrugation and the required graphic
content can not be printed at the low concave part of the corrugation. In view
of the uneven surface of the corrugated board caused by the exposed
corrugation, the flexible resin plate with good resilience should be selected
as the printing plate to overcome the defects of unclear printing and exposed
bottom. In particular, the A-type corrugated board produced with low-g paper
will be greatly damaged by printing machine. In addition, the edgewise
compression strength of corrugated board will also be greatly damaged after
passing through printing roller and embossing roller.
If the surface roughness of corrugated
board is too different, it is easy to cause the corrugated board produced by
the corrugated board line to warp. Warped paperboard will lead to inaccurate
overprint and printing slotting, so the warped paperboard should be flattened
before printing. If the uneven corrugated board is printed by force, it is easy
to cause the gauge to go, and it will also cause the thickness of the
corrugated board to drop.
Troubleshooting of color difference in
the same batch of paper box printing
How to improve the quality and
technology of corrugated box printing, in one production, the printing process
of four-color machine appeared the problem of printing sheet color is accurate,
but the whole batch of printing specifications are inconsistent, resulting in
the post-processing can not be carried out. The reasons are as follows.
The height of the front gauge is not
suitable. In the front gauge positioning, three printed papers are usually
stacked together and inserted under the front gauge, so as to have the feeling
of front gauge pressing paper when twitching, and the paper can twitch freely.
If the front gauge is too high or too low, the paper positioning will be
inaccurate, and the specifications of the printed products will be
inconsistent.
The side gauge positioning is not
accurate, which includes the height of the side gauge press board and the
pulling force of the paper roller. If the height of the press board and the
pulling force of the paper roller are not appropriate, the paper can not be
pulled in place or over the head, resulting in inaccurate positioning of the
paper side gauge. In general, paper box printing with the height of the side
gauge press board should be 3 times of the thickness of the printed paper, and
the side gauge drawing distance should be 5-8mm.