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Technical specifications of CTP plates
- Aug 06, 2018 -

CTP version manufacturers explain the CTP version of the technical specifications

After the introduction of CTP technology into China for several years, the general development of CTP technology, more and more enterprises using CTP technology, technology has been relatively mature. Throughout China's printing market, CTP still has a lot of room for development, so major printing equipment and material suppliers also regard China's market as a huge opportunity. The same is true for CTP plate suppliers. At present, in the domestic market, almost all the world famous brands of CTP plate DTP, such as kodak, Fuji film, agfa and so on can be seen. At the same time, domestic enterprises such as the second film factory have developed their own intellectual property in recent years, the CTP version of the market can be said to be a hundred flowers.

However, multi-brand and multi-technology have brought the printing enterprises the difficult choice of the happiness of the worry, how to choose the reasonable plate material has become an important issue, usually to consider economic factors, technical factors and other factors. Because the economic factors of various enterprises are different, we cannot generalize about the printing packaging city, so we will analyze the technical evaluation index of CTP plates for the large number of printing enterprises here, hoping to provide help for enterprises to choose and buy.

Common CTP plate evaluation methods, such as size, shape and distribution of sand mesh, coating thickness, etc., are relatively expensive for printing companies because electronic microscopy and related physical and chemical instruments are needed in testing. Moreover, these indicators are usually aimed at plate manufacturers, and the guidance for printing is not direct stereoscopic printing. Therefore, the following indicators concerned in printing are proposed in this paper.

Network representation

Dot is the basis of reproduction of graphic information in printing, which plays an important role in printing. The quality of the dot on the printing plate will directly influence the quality of the dot on the printing plate, and then affect the whole printing process reproduction. Therefore, the first step to control the dot is to select the plate with good dot reproduction. Measuring the dot reappearance of plate materials mainly has the following aspects.

1. Reproduction of amplitude modulation dot

The traditional CTF process is the computer directly output film green printing, and then based on the film through the printer to make PS version. In this process, due to the bottom diffusion phenomenon when printing plate exposure, so there will be a certain degree of loss when printing dot. At the same time, the traditional PS plate material development of the width of small, slightly longer development time, less than 2% of the dot will be lost binding, development time short will not be transparent, resulting in dirty. So in the process of printing plate printing dot has a certain proportion of reduction.

This phenomenon no longer exists after the adoption of the CTP process, so CTP has the ability to replicate 1-99% of the nodes technically. The remaining question is whether the CTP version has the ability to support 1% to 99% of the network capacity. This is the CTP plate production quality of important indicators.

As with the traditional PS version, the CTP version of the material is also composed of sand mesh, to be able to support less than 3% of the mesh needs to be small enough. Because sanmu more fine printing process, the number of sanmu that supports high light part of the dot more, so that the dot is more solid, printing occurs the possibility of the less. However, the mesh point can not be too fine. If the mesh point is too fine, it will affect the wetting condition of the plate material.