Printing quality is a matter of great
concern. It is determined not only by the design of the manuscript, but also by
the printing process of each printing
factory. Today, what I want to share with you is the printing process of
Plate quality control
When printing book, the PS plate depends on the body, the outside, the trailing
tip three parts to add color mark, so, in the inspection of the printing
finished products, easy to find out over printer, paper reversal, double sheet
caused by the whole plate leakage and mixed use of different plates.
In addition, print staff must carefully
check the quality of PS and film, book printing plate before the machine, to avoid plate quality problems affecting production.
At the same time, the correct version should be skilled and accurate, as far as
possible to reduce the number of correction; When drawing plate to uniform
force, to avoid printing plate due to elongation caused overprinter.
Selection of printing consumables
(1) the paper
In the process of multicolor printing,
choose the paper with good sizing and strong adaptability to avoid the
phenomenon of paper drawing, powdering and so on. Before printing, cut paper
should be packed to prevent it from being affected by moisture deformation.
(2) the ink
Light fast dry ink is permeable drying ink,
suitable for the printing of offset paper, can avoid the resin type ink
produced by powder and glossiness, adhesion, hair, and other phenomena, drying
faster. But in the use of the process, the ink, to prevent ink drying, leather.
(3) rubber cloth
In normal printing process, should frequently
wipe the blanket, in order to reduce the paper powder, ink accumulation, to
avoid affecting the blanket reduction. As a result of the new rubber blanket
good flexibility, extension, tension should be carried out gradually. In daily
operation, every tension, after the offset press stop and then tension again,
so repeated tension several times, so that rubber blanket tension requirements.
Plate pressure control
Due to rough surface, ink absorption
performance is good, so in order to make printing ink thick, dot clear, when
printing to increase printing pressure. In addition, the pressure of water
roller and ink roller should be appropriate, subject to the requirements of the
specification for regulation, to maintain good water and ink performance.