Huaguang thermal CTP version of the performance and use of three conditions

5 Huaguang TN thermal CTP version of the use of conditions

1. Plate exposure parameter correction

Before using Huaguang TN thermal CTP plate, the parameters of the plate-making machine should be firstly corrected, that is, the parameters of the platesetter should be corrected according to the thickness of the plate, the imaging type, and the sensitivity of the plate. Then according to the machine's own test strip, the laser focus, laser intensity, resolution, drum speed, laser uniformity and other parameters are corrected one by one. After exposure of the test strip with different parameters, evaluation is performed after preheating and development processing to finally confirm the parameters used by the plate in the plate-making machine used, and input into the thermal plate-making machine.
2. Determination of process conditions for preheating work area

First, the development temperature was set at 24.10° C., the development time was 30 s, and the pre-bake time was set at 1 min. After the exposure, the plate was changed to a different pre-bake temperature and pre-baked and then processed. The pre-baking temperature was determined on the premise that the imaged area had no loss of large density in the image area, no small dot was lost, and no image area was clean without leaving a bottom. Huaguang TN thermal CTP plate pre-bake temperature is best controlled at 130-140 °C. In practice, the pre-baking temperature should be as high as possible, which is conducive to improving the printing performance of the plate, especially the resistance to printing force.

3. Determination of Process Parameters in Developing Work Area

Pre-baking temperature is determined under the premise of maintaining pre-baking time 1min, using Huaguang TND developer development, the development temperature of 24 + l °C, the exposed and pre-baked version of the development process, in the imaging There is no loss of large density in the area of ​​the image on the plate, no loss of small dots; no image area is clean without leaving the bottom of the principle, to determine the development time. The development time should be as short as possible, which is conducive to improving the printing performance of the printing plate, especially the printing force and ink resistance.

4. Plate post-processing

After the qualified printing plate is made, it is necessary to apply a protective layer on the surface of the plate, and it is best to use the special protective layer of Huaguang Thermal Protection. But be careful that the protective glue must not be too thick, thin and even. If the layout is dirty, use Huaguang Jie Ban paste to remove dirt.

The fountain solution is also best to use Huaguang thermal CTP plate special fountain solution, so that it can ensure the production of a good quality plate.

5. other

If you want to make a high-quality, high-volume printing plate, in the processing version should follow the principle of high temperature preheating, low-temperature rapid development. The prepared plate can be stored under yellow light. Be careful not to direct sunlight in the sun, so as not to affect the printability of the printing plate. If you have a large amount of ink, or use UV ink, it should be baked at a temperature of 200-220°C for 5-10 minutes and then used again.

Although this article describes the technical characteristics and requirements of Huaguang thermal CTP plate in detail, the user must perform debugging according to their actual working conditions to obtain the best results.

(Author: Wang Shiqin Zhao Wei Jian)