When it comes to printing, most people must think of offset printing. Due to its fast printing speed, relatively stable printing quality and short printing cycle, offset printing is used in books, newspapers and most commercial printing. So, do you understand the principle of offset printing? Let's get to know!

Three principles of offset printing:

1、 The principle of water oil incompatibility, the so-called similarity compatibility principle in chemistry, determines that the molecular polarity between water molecules with mild polarity is different from that between non-polar oil molecules, resulting in the inability to attract and dissolve between water and oil. The existence of this rule makes it possible to use water in plane printing plates to distinguish between pictures and blank parts.

2、 According to the principle of surface selective adsorption, the substances it can adsorb are different according to the different surface tension, which also provides the possibility of image and text separation of lithographic offset printing.

3、  The principle of dot image construction, because the offset printing plate is flat, it can not rely on the thickness of ink to express the graphic level on the printed matter, but by dividing different levels into very small dot units that cannot be detected by the naked eye, it can effectively show rich image levels.