Figure (1) shows a basic CTP process component diagram. The first part of the CTP is the Desktop Publishing System (DTP) system. When it reaches the CTP, it goes through the process of plate making and outputs the image. Text version.
In the CTP's plate making process, a laser method is used to write image text on a laser-induced printing plate. So why do we use lasers to make plates?
Laser (LASER) itself is a photon (Photon), but its characteristics are very different from the general light, and the English LASER is an acronym: LightAmplificationbyStimulatedEmissionRadiation, from the full meaning of this word, we can understand the laser?
The extremely high brightness of the laser is understandable because it is generated by a tumbling process. The light, infrared radiation, or microwave radiation of an appropriate frequency is directed onto a laser medium or a pulsed medium, and since the medium absorbs radiation, the number of atoms or molecules occupying a higher energy state is increased, and thus a strong light is generated. We don't directly use the eyes to watch the laser light source. We must wear it first.
Monochromatic refers to the fact that a laser has only a single color of light. Its spectral wavelength is limited to a very narrow wavelength range. Unlike a light bulb or a diode, it contains different wavelengths to produce a white light source or a yellow light source. . Whereas lasers only contain a single wavelength, all energy will be concentrated on this wavelength, so when the laser is directed to Mitsubishi?
Collimation means that the laser itself is a process in which the particle beam is parallel to a certain line or in a certain direction. Therefore, the diameter of the laser light is uniform from the light source to the target, and the size can reach the nanometer (μm) range. As shown in Figure (c).
Coherence means that the laser light has electromagnetic waves of the same wavelength or approximately the same wavelength, and the phase relationship at different points in the field remains constant, and the amount of size is consistent between different cross-sectional points. As shown in Figure (4).
These are all characteristics possessed by lasers, and the laser itself can be divided into homogenous lasers, gas and semiconductor lasers. In the printing industry, most of the gases used are Helium (Neonor Argon) ions. The color of light is generated between blue and red in the visible spectrum. Based on the characteristics of the above laser,?
In the last article, we talked about the characteristics of some lasers. The ability to develop CTP systems, in addition to the application of lasers, and the ability of computers to process data, has added to the improvement of printing plate surface materials.
In the more than ten years of research and development of the CTP industry, researchers have been adapting and cooperating with various requirements and applications of the printing industry in order to achieve the development of the system and to meet the needs of the actual printing process. They focus on, for example,
1. To broaden the spectral range that can be sensed by the material on the surface of the printing plate;
2. Increase the precision of the plate to make it have a good printing effect;
3. The printing plate can match the traditional water and ink equilibrium;
4. Increase the durability of the printing plate;
5. Maintain the stability of the image text interface transfer during the printing process;
6. Low cost and so on.
When developing the technology of CTP system, the most important solution is the performance of the surface photosensitivity of the printing body, and it must be able to maintain the quality level of the general printing plate. However, this work is very difficult because of the need to improve a certain characteristic while at the same time weakening another characteristic. For example: When the photosensitivity of the printing plate surface is improved, the roughness of the surface will increase, and the plateau cannot have a high-precision printing effect.
The researchers used a pure photopolymer as a photosensitive layer on the surface of the printing plate. The polymer was negative. The benefit was that if the plate was coated with aluminum, the plate area remained stable. The surface of this printing plate is capable of sensing a very small amount of photons to produce maximum photopolymerization. Argon-ion laser is used as a light source, and a water-soluble developer is used.
Another way to increase the amount of light is to use silver halides. This printing plate has extremely sensitive photosensitivity. At extremely low light levels, it can also be used as a printing plate with good printing effect. The test results can reach 25,000-50,000 or more pieces, plus this type of plate has a high degree of precision, can print detailed images
There is also a method for manufacturing a CTP printing plate which is a printing plate of Polychrome CTX. What is special about this printing plate is silver halide latex photopolymer that can increase its print and precision.
FIG. 6 shows the case where a plate of silver halide texture is sensitized. After the plate was irradiated with a low-energy laser, Ag changed from AgX to Ag and 1/2X2. The equation is as follows:
During the flushing of the developing solution, the surface latex material is washed away with warm water, leaving behind a layer of ink prone and a layer of hydrophilic anodized aluminum oxide on the surface of the plate. The sensitization process of CTX plates is roughly the same as that of silver halide plates. The difference is that during the development process, when the coated surface of silver is developed and shaped, the pattern on the plate undergoes UV light. Irradiation?
When the CTP plate is realized, there is room for improvement and development to a certain extent, but it is technically very difficult to overcome the sensitivity of the control method of the electrodeized photographic reproduction produced by the laser. At present, CTP plates made by researchers have already paid a great deal of effort.
The CTP system, in addition to the computer or the main brain computer to take charge of the desktop publishing work, there is a CTP recorder (CTPRecorder), which is an important part of the system, each recorder has a sophisticated instrument to control the laser source The plates are active and powerful. When designing this logger, what we need to consider is how to print plates with?
Internal Drum Exposure Method; External Drum Exposure Method; Flatbed Exposure Method. Internal drum exposure method (InternalDrumExposureMethod)The current market's popular CTP system uses this method for exposure, and the size of the drum is approximately 23 inches x 46 inches, and half the length is to place the printing plate. In addition, the diameter and length of the roller must have enough space for Plates can be freely moved to different positions within the drum, and it is necessary to ensure that the deviations are as small as nanometers. ?
The trajectory of the controlled photon is a lens that is tilted by 45 degrees and rotates. The trajectory of the reflected photon has changed exactly 90 degrees from the original trajectory. When the mirror rotates, the photon's trajectory will draw a circle with a vertical axis. But if the mirror turns and moves along the shaft, the photon track
External drum exposure method (External Drum Exposure Method) The outer drum method is used by Optronics machines, and its drum has a similar place to the drum of the press. The printing plate is placed on the outer layer of the cylinder, just opposite to the internal cylinder.
Figure (9) shows the method of the outer drum. In order to minimize the exposure time, a photon is dispersed into several photons and the image text is printed on the plate. The dispersion of photons is the use of a series of dichroic mirrors. The mirror reflects some of the photons and allows the other half to pass through. The ratio of reflection and penetration depends on the coefficient of the mirror.
Another way to increase the number of photon beams is to convert a single laser light source into a device with dozens of laser light sources. The light source is arranged in a matrix manner. The light source can be controlled to be the same.
In addition to
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