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Offset printing is something you should know

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 offset paper.

 

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.




Release Date: 08-03-2018 11:04:34 [Go back Menu]

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