Application of most flaming light sensitive CTP an

2022-07-31
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Application of photosensitive CTP and thermal CTP Technology (I)

I. benefits of introducing CTP technology

reduce production links, shorten production cycle

improve production efficiency, improve the utilization rate of printing machines

improve printing quality, increase market competitiveness

reduce production costs and improve benefits

today, the competition among printing enterprises is no longer a simple competition of equipment and prices, It is a counterbalance of comprehensive ability. Whether the printing process and process changes are practical and correct should be evaluated and measured by whether the enterprise can improve its control over production. Among them, the most important thing is to control all work links: control efficiency, control quality and control cost

there are many variable factors in the traditional plate imaging process that will directly affect the printing workshop, the Department with the highest cost in the printing plant. Its effects include:

longer adjustment preparation time

increased material loss

unable to ensure accurate addition (am and/or FM)

poor printing suitability, resulting in unstable printing quality

the direct consequence of unstable plate imaging is higher cost, lower profit and lower customer satisfaction

key points: the key of CTP technology is to eliminate the variable factors in the process of plate imaging

to improve production capacity and quality, of course, there will be costs. However, this cost should be regarded as an investment - the investment in the improvement of the enterprise's ability to get more and greater returns through improvement

II. Comparison of technical principles

photosensitive Technology:

uses the traditional imaging principle similar to film exposure. The plate surface is coated with photosensitive material, and the drug film senses the light energy controlled by the data to produce an image. There are two photosensitive methods: silver salt and photopolymerization. Generally, the internal drum exposure imaging mode is adopted

visible light plate is sensitive because it can image with very low energy exposure (it is measured in milliwatts, while thermal laser is measured in watts). The weak exposure energy can only make slight changes to the photosensitive emulsion, which will be amplified when developing the plate. As long as the printing plate is slightly overexposed or underexposed during manufacturing, storage, temperature, humidity or development, the imaging area will be significantly affected. The sensitivity of the visible CTP system makes its imaging stability less improved than that of the phototypesetting system in the production of ooho algae, and even more difficult to control

thermal technology: thermal technology means that the plate image is generated by thermal energy. Generally, external drum imaging mode is adopted

an important concept in thermal technology is the critical value: under the critical temperature, the plate will not generate images and no reaction will occur. When the critical temperature is reached, the plate generates an image. And when the temperature exceeds the critical temperature, which is equivalent to excessive drying in the traditional printing process, the size and shape of the generated points will not be affected. This fundamentally solves the inaccuracy of point reproduction caused by excessive or insufficient drying or unstable washing conditions in the traditional photosensitive plate making process

the binary drying mode of the thermal technology makes the points extremely sharp, with high resolution and no point expansion.

the above figure is an enlarged thermal plate point and a photosensitive plate point respectively

we can clearly see whether there is abnormal noise and the sharpness of vibration point edges on the thermal plate before the experiment. Such sharp point edges make high-quality point replication possible. The ink and hydrophilic areas of the thermal plate are clearly defined, and the minimum division value of the micrometer drum: 0.0625 μ M this ensures the excellent printability. "One year later, the above figure is the root of the point on the enlarged printing plate

we can clearly compare that the ink and hydrophilic areas of thermal plates are more clearly defined. The accurate control of ink and water balance in the printing process is greatly improved

key points: the concept of critical value of thermal technology is exactly equivalent to the core concept of digital technology. It is not the binary concept of "0" or "1". Whether the plate is imaged only depends on whether the critical value is reached. Heat sensitive technology has truly realized the digitalization of computer direct plate making

(to be continued)

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