HOW OFFSET PRINTING WORKS?

 

 

What is the working principle of the offset printing machine? What should I pay attention to when using the offset printing machine?

Offset printing machine:

 The offset printing machine is a kind of offset printing machine. When packaging printing, the text is printed on the eraser drum from the printing plate first, and then by the eraser drum transfer paper to printing paper.

Division of offset printing machine:

1-According to different paper feeding methods, the offset printing machine can be divided into

·         a sheet of paper offset printing machine and

·         a roll of paper offset printing machine.

2- According to the color saturation of packaging printing performed by one paper feeding, it can be divided into

·         Solid color,

·         Two-color,

·         Four-color and

·         Mixed-color printing equipment

3-According to the printing process the larger printing paper width can be divided into small offset printing presses,

·         six-opening,

·         four-opening,

·         two-opening and

·         Full-sheet printing equipment.

 In addition, there is also a double-sided printing equipment that can perform double-sided packaging printing at one time.

 A sheet of paper offset printing machine:

 A sheet of paper offset printing machine is an offset printing machine, used for packaging and printing high-end business service printed matter.

 

Packaging printed matter,

 It is the popular packaging printing in the contemporary era. 

 

　　What is the working principle of an offset press?

　　Technical process principle of silk-screen printing:

　　①The principle of water and oil immiscibility.

 In organic chemistry, the standard decision for compatibility is similar. The molecular formula of water with slight optical rotation and the molecular structure of non-polar oil are different in polarity, causing the water and oil to be unable to attract and melt. There is a possibility that the plan printing plate uses water to distinguish between the text and the vacant part.

　　In daily life, everyone has the basic common sense: the surface that has been drenched with water is not easy to be stained by oil, and water and oil have always contradicted each other. Because the printing plates of screen printing are basically on the same floor plan, it is necessary to find a reasonable way to distinguish the vacant part and the text part. The effect of water in screen printing is called "water and oil are not compatible." The principle of "melting". In the whole process of packaging and printing, first apply a thin layer of water barrier layer on the surface of the printing plate (in fact, because of the selective absorption of the surface of the printing plate, part of the text and pictures are not easy to touch water), and then print In the case of sizing ink on the plate, the vacant part is maintained reasonably.

　　②The principle of selective adsorption of printing plates.

 Depending on the surface supporting force, the chemical substances it can absorb are different, which also shows that it is very possible for the lithographic screen-printed text to be separated.

　　③Principle of the appearance of business outlets;

The printing plate of screen printing is flat, it is impossible to rely on the thickness of the ink to mainly express the level of the printed matter in the above figure, but according to the division of different levels into very subtle people The business network modules that are not visible to the eye can reasonably show the rich and colorful image hierarchy.

　　　　What should I pay attention to when using an offset press?

　　In the packaging and printing of the offset press, it is very important to maintain the balance of ink strokes. In daily actual operations, in addition to the proper grasp of specific conditions such as the size and distribution of the text and the distribution of the section, the characteristics of the printing paper, and the characteristics of the ink, the following aspects should also be paid attention to:

　　①Before starting, be sure to fill up the water evenly on the dry water roller.

　　②When the equipment rotates at a high speed, the power supply and ink supply will be terminated immediately to prevent the ink strokes from being unbalanced due to large water and ink.

　　③The newly changed ink-stroke fleece is key and flat, and both sides must be sutured firmly. Before operating on the machine, the water roller must be fully moistened first, and the moisture must be kept to a minimum during packaging and printing. The water roller that has just been changed usually has a higher moisture content than the old water roller, which can easily cause excessive moisture.

　　④Don't make the ink too thin when adjusting the ink. If the adjustment is too thin, its fluidity will be too large, and of course its own viscosity and adhesion will decrease, which will reduce the waterproof properties and easily cause more serious emulsions, which will cause the grinding to melt and expand under the working pressure of the drum. It will cause stale version and endanger product quality. Therefore, it is best to control the usage of the mixed ink below 10%.

　　⑤ In the whole process of packaging and printing, the ink is usually very easy to stick to the surface of the water roller, and it becomes thicker and thicker, and the total area becomes larger and larger. After shutting down, the rubbing will solidify quickly. If it is not eliminated immediately, it will cause uneven water inflow. Even if the ink strokes are unbalanced, it will endanger the life of the printing plate and the water roller. Therefore, sufficient attention should be paid.

　　⑥ Properly adjusting the working pressure of the water roller and ink roller is a prerequisite for ensuring the balance of ink strokes. If the working pressure is not well regulated, it usually results in the obstruction of water and ink delivery.

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