In the development process of traditional printing plates and films, there are generally no problems, but in the field of computer-to-plate, the development process will afflict us like a devil, and it will affect the quality of plate production anytime and anywhere. Therefore, we should incorporate the purchase of developing equipment into our investment strategy when we introduce CTP plate-making equipment.
We often encounter such a situation in the usual printing production process: the newly installed plate has just been printed for a while, the plate is dirty, and our workers report the quality of the plate. In fact, the reason for this phenomenon may be caused by the printed version of the body, it may be due to improper development. Let's discuss the effect of plate development on the quality of printing plates.
1 Structure of the developing machine
The length of the exposure time of a traditional printing plate mainly depends on the sensitivity of the printing plate, the output power of the UV light source, and the distance between the light source and the printing plate. The usual exposure time is more than 10 seconds. The CTP exposure system uses visible light, infrared light, or ultraviolet light to complete the tanning work of the printing plate's Internet site in milliseconds or microseconds. This requires that the CTP plate has a sufficiently high sensitivity, and accordingly, the CTP printing The requirements for the development process are also more stringent than the traditional printing plates.
Under the premise of constant developer concentration, the requirements for the development time of the CTP plate are much more stringent than the requirements for the development time of the traditional plate. In the CTP plate development, the allowed variation range of time is ±10% to ± 15%, while the allowable variation in time is ±50% in traditional plate development. In the traditional printing plate development process, the temperature range of the developing tank is allowed to be between 2-3 °C, and the temperature of the developing tank is only allowed to be in the soil during the development of the CTP plate. Fluctuate within 5°C, otherwise it will affect the quality of plate imaging. It can be seen that if the development parameters are set unreasonably during the development process, the normal operation of the entire CTP process will be affected.
The light source used for the polyester plate imaging is usually visible light, such as a 488 nm argon ion laser, a 532 nm single-frequency YAG laser, and the like. For the heat-sensitive printing plates, light sources in the infrared region of the electromagnetic spectrum are commonly used, for example, 830 nm LCD lasers and 1064 nm dual-frequency YAG lasers.
Like traditional plate printing, CTP plate processor is also composed of several parts such as developing, cleaning, gluing and drying. For CTP development equipment, the priority is not the length of the development channel, the size of the developer tank, the structure of the development brush, but the stability of the development process and the replenishment of the developer. In particular, it is ensured that the developer is oxidized as little as possible during the development process, the stability of the supplementary flow rate of the developer is ensured as much as possible, and the effect of the developing solution showering on the transfer of the printing plate is reduced. If the developer supply flow rate and the developer washing method are improperly controlled, it will cause a virtual halo at the edge of the smooth dot on the printing plate and cause a greater burden on the developer recovery and utilization.
The amount of developer supply should be based on the test. Previously, we usually only detected the length of the printing plate. In fact, this is inaccurate, because the width of the printing plate we use may be inconsistent, so it is more accurate to detect the printing. The actual area of ​​the edition. In addition, we may also determine whether the developer should be replenished by measuring the conductivity of the developer. If the conductivity of the tested developer changes, it means that a new developer should be added. The Techno Grafica processor is said to measure both the plate area and the conductivity of the developer.
The bottom of the developing tank of the developing machine is now designed as a column, because dirt and other deposits in the developing solution are usually deposited on the bottom of the tank. This design is conducive to protecting the plate from being contaminated by dirt and other deposits. Pollution, secondly, this structure facilitates the discharge of these dirt and other deposits into the pipeline. Of course, in order to reduce the dirt and other deposits in the developer, we have to filter the developer into the developer tank beforehand to measure the pH.
Previous CTP plate printers were usually used in conjunction with printing plates and developers. With the advancement of technology, there have been the development of both photosensitive CTP plates, thermal CTP plates, and even the development of traditional PS plates. The developing device. It is also possible to add a flushing unit to the front of the processor for a specific printing plate in order to remove the protective layer on the printing plate surface. (to be continued)
We often encounter such a situation in the usual printing production process: the newly installed plate has just been printed for a while, the plate is dirty, and our workers report the quality of the plate. In fact, the reason for this phenomenon may be caused by the printed version of the body, it may be due to improper development. Let's discuss the effect of plate development on the quality of printing plates.
1 Structure of the developing machine
The length of the exposure time of a traditional printing plate mainly depends on the sensitivity of the printing plate, the output power of the UV light source, and the distance between the light source and the printing plate. The usual exposure time is more than 10 seconds. The CTP exposure system uses visible light, infrared light, or ultraviolet light to complete the tanning work of the printing plate's Internet site in milliseconds or microseconds. This requires that the CTP plate has a sufficiently high sensitivity, and accordingly, the CTP printing The requirements for the development process are also more stringent than the traditional printing plates.
Under the premise of constant developer concentration, the requirements for the development time of the CTP plate are much more stringent than the requirements for the development time of the traditional plate. In the CTP plate development, the allowed variation range of time is ±10% to ± 15%, while the allowable variation in time is ±50% in traditional plate development. In the traditional printing plate development process, the temperature range of the developing tank is allowed to be between 2-3 °C, and the temperature of the developing tank is only allowed to be in the soil during the development of the CTP plate. Fluctuate within 5°C, otherwise it will affect the quality of plate imaging. It can be seen that if the development parameters are set unreasonably during the development process, the normal operation of the entire CTP process will be affected.
The light source used for the polyester plate imaging is usually visible light, such as a 488 nm argon ion laser, a 532 nm single-frequency YAG laser, and the like. For the heat-sensitive printing plates, light sources in the infrared region of the electromagnetic spectrum are commonly used, for example, 830 nm LCD lasers and 1064 nm dual-frequency YAG lasers.
Like traditional plate printing, CTP plate processor is also composed of several parts such as developing, cleaning, gluing and drying. For CTP development equipment, the priority is not the length of the development channel, the size of the developer tank, the structure of the development brush, but the stability of the development process and the replenishment of the developer. In particular, it is ensured that the developer is oxidized as little as possible during the development process, the stability of the supplementary flow rate of the developer is ensured as much as possible, and the effect of the developing solution showering on the transfer of the printing plate is reduced. If the developer supply flow rate and the developer washing method are improperly controlled, it will cause a virtual halo at the edge of the smooth dot on the printing plate and cause a greater burden on the developer recovery and utilization.
The amount of developer supply should be based on the test. Previously, we usually only detected the length of the printing plate. In fact, this is inaccurate, because the width of the printing plate we use may be inconsistent, so it is more accurate to detect the printing. The actual area of ​​the edition. In addition, we may also determine whether the developer should be replenished by measuring the conductivity of the developer. If the conductivity of the tested developer changes, it means that a new developer should be added. The Techno Grafica processor is said to measure both the plate area and the conductivity of the developer.
The bottom of the developing tank of the developing machine is now designed as a column, because dirt and other deposits in the developing solution are usually deposited on the bottom of the tank. This design is conducive to protecting the plate from being contaminated by dirt and other deposits. Pollution, secondly, this structure facilitates the discharge of these dirt and other deposits into the pipeline. Of course, in order to reduce the dirt and other deposits in the developer, we have to filter the developer into the developer tank beforehand to measure the pH.
Previous CTP plate printers were usually used in conjunction with printing plates and developers. With the advancement of technology, there have been the development of both photosensitive CTP plates, thermal CTP plates, and even the development of traditional PS plates. The developing device. It is also possible to add a flushing unit to the front of the processor for a specific printing plate in order to remove the protective layer on the printing plate surface. (to be continued)
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