What are the evaluation criteria for CTP sheets

The evaluation criteria and importance of CTP board in the modern printing industry, Computer to Plate (CTP) technology has become the mainstream prepress processing method. The core of CTP technology is to use photosensitive materials to produce high-quality and high-precision printing plates, thereby achieving efficient, environmentally friendly, and low-cost printing production. Choosing the appropriate CTP board is crucial for ensuring printing quality. This article will explore the evaluation criteria for CTP sheets and the importance of these criteria. Resolution refers to the ability of CTP sheets to reproduce the smallest details possible. Usually expressed in dots per inch (dpi). Higher resolution means that finer lines and image details can be faithfully reproduced. Therefore, resolution is an important indicator for measuring the performance of CTP sheets. Contrast refers to the brightness difference between the unexposed and exposed parts of a CTP board. High contrast helps to improve the clarity and sharpness of the printing plate, making the text and lines in the printed material more distinct. In addition, appropriate contrast can also help reduce the phenomenon of dot enlargement and improve the accuracy of color reproduction. Sensitivity refers to the degree to which CTP sheets are sensitive to light, usually measured in mJ/cm ² Expressed in millijoules per square centimeter. High sensitivity boards can be exposed at lower energy levels, which not only helps to reduce equipment energy consumption, but also shortens exposure time and improves work efficiency. Meanwhile, high sensitivity also means that special attention should be paid to avoiding overexposure or underexposure during use. Printing Life refers to the length of time a CTP board maintains its physical properties and chemical reactivity after continuous use. A board with good printing resistance can provide consistent high-quality printing plates stably for a long time, which is particularly important for large-scale production and long-term projects. With the increasing awareness of environmental protection, the environmental adaptability of CTP sheets is also receiving increasing attention. Some new types of panels, such as washless CTP panels, can greatly simplify the process flow and reduce waste liquid emissions, meeting the requirements of green printing. In addition, the stability of the board under different temperature and humidity conditions is also one of the considerations. The characteristics of dimensional stability and flatness are related to the performance of CTP sheets in practical applications. Stable sheet metal is not easily deformed, ensuring accurate alignment; A good flatness helps to form a uniform light distribution during exposure, avoiding irregular dots caused by warping. Compatibility&Service Support Finally, it is important to consider whether the CTP board is compatible with existing devices and software systems. In addition, the after-sales service and professional technical support provided by suppliers can also bring convenience and guarantee to users. Choosing the appropriate CTP board requires comprehensive consideration of the above evaluation criteria. By strictly controlling the quality of the board, printing enterprises can effectively enhance product competitiveness and meet the growing diverse needs of customers.