Offset printing PS plate (Pre-Sensitized Plate) is a printing plate commonly used in the printing industry, mainly for offset printing process. In China, there are many well-known PS plate suppliers, which provide PS plates with different specifications and quality to meet the market demand.

I. Specifications

- Thickness:

The thickness of the PS plate is an important specification parameter, which affects the printing effect and durability. Common thickness specifications include 0.15mm, 0.30mm, etc. These thicknesses are suitable for different presses and printing tasks.

- Size:

PS plates are also available in a variety of sizes to suit the size requirements of different prints. Common sizes include octavo, hexavo, rotary, folio, full-open, super-full-open, etc. These sizes are able to meet the size requirements of various printed materials.

2. The quality

- Original quality:

The quality of the original plate directly affects the PS version of the plate effect. High-quality original should have sufficient dot density (single dot density of 3.0 or more, the field density of 3.5 or more), and dot center density and edge density is consistent to ensure that the expansion of the exposure time tolerance. At the same time, the original plate should be clean and free of dirty stains, preferably without a knife edge and collage tape of the complete film to ensure that the film and the PS version of the close combination, to avoid the scattering of light caused by the phenomenon of dot hair virtual.

- Plate quality:

The quality of the plate is also a key factor affecting the quality of the PS plate. High-quality plate should have a clean, uniform thickness of the plate base, uniform distribution of sand, moderate thickness and depth. Photographic liquid should be coated evenly, no bubbles, no scars. It is generally required that the average depth of the grit (RZ) is 5~7.5μm and the average roughness (RA) is about 0.6μm.

- Photopolymer layer:

The quality of the photopolymer layer has an important impact on the plate making effect and printing effect of the PS plate. High-quality photopolymer layer should have good photopolymerization performance and abrasion resistance to ensure plate making accuracy and printing quality.

- Printability:

Printing resistance is one of the important indexes to measure the quality of PS plate. High-quality PS plate should have a long print resistance, to ensure that in a large number of printing process to maintain stable printing quality. Printability is affected by a variety of factors, such as platemaking process, plate conditions, printing inks and fountain solutions.

- Other quality factors:

In addition to the factors mentioned above, the quality of PS plates is also affected by factors such as storage conditions and the environment in which they are used. Therefore, when storing and using PS plates, attention should be paid to avoiding direct sunlight, high temperature and high humidity and other unfavorable conditions, so as to ensure the stable quality of PS plates.

Offset printing PS plate has many different specifications and quality requirements. When choosing PS plates, they should be selected according to specific printing needs and equipment conditions to ensure that the best printing results and durability are obtained. And when choosing the right PS plate supplier, you can consider its product quality, technical support, after-sales service and price. It is recommended that you contact the manufacturer for specific product information and quotation before purchasing.