In offset Printing, there has always been a problem that the printing plate has insufficient printing resistance. Improving the printing plate's resistance to printing forces plays an important role in reducing production costs, ensuring print quality, and shortening the printing cycle. The factors that make offset printing plates resistant to printing forces are more complex. It involves plate making, printing, and other processes. It is worth the attention of printing workers and takes them seriously.
Different media have different print resistance, which is due to the surface structure of the printing plate, the graphic part and the material properties of the blank part. The level of resistance of printing plates is inseparable from the inherent mechanical strength and chemical stability of plates. They are the internal factors that determine the role.

1. PS plate: Its plate is mainly aluminum. The mechanical strength of aluminum is relatively low. In order to increase its mechanical strength, it is necessary to add a small amount of metal such as iron, magnesium, and copper to become an alloy. The thickness of the oxide layer of the PS plate is generally controlled within 3-4μm. Through electrolytic oxidation and other processes, the surface of the aluminum plate base is formed with a complex structure of sand, which can increase the surface area by 2 to 6 times, and the depth of the sand hole is about 3 to 6 μm. . The diazo photosensitive layer and the blank alumina layer of the PS plate section have high mechanical abrasion resistance and good corrosion and affinity adsorption properties. Under normal circumstances, the PS version of India's resistance to force about 5-10 million, after the high-temperature barbecue PS version, to increase the graphics and some of the diazo photosensitive layer hardness and wear resistance, resistance to force up to 200,000 or so .

2. Multi-layered metal plate: The graphic part and the blank part are respectively made of copper and chromium, which have a wide range of wear resistance, corrosion resistance and affinity adsorption performance. Its resistance to printing force is even higher and can reach more than 500,000 sheets.

3. CTP version: At present, common CTP plates include thermal plates, silver salt diffusion transfer plates, and other major categories. Plates are the same as those of PS plates, and aluminum is still used as the plate base. After roughening, different types of sensitization are coated. glue. Due to the different imaging methods in the later period, its resistance to printing force is generally higher than that of ordinary PS plates. It can reach 10-20 million prints, and can reach more than 1 million prints after baking.

In addition, there are many other factors in the printing will have an impact on the printing plate's resistance to printing. For the printer, it is necessary to maintain a high sense of responsibility, improve and improve the printing standards and technical standards, and fundamentally improve the printing plate's resistance to printing, so as to print high-quality, high-quality print.