5. Copper ionized digital reproducible flat printing plate making principle
The plate cylinder used in this method of plate making is plated with a layer of nickel oxide, which has the properties of a semi-conductor, and sees that light becomes a conductor. When making a printing plate, first apply negative charge to the plate cylinder body, then apply a thin layer of copper ion-containing electrolyte to the nickel oxide layer with a coating device, and then irradiate the electrolyte with a laser beam (the laser spot is According to the color separation data of the original). The nickel oxide photoreactive part becomes a conductor, the electrolyte and the plate cylinder are switched on, and the copper precipitates on the nickel oxide layer. Precipitated copper ion forms a graphic part of the ink, where there is no copper ion precipitation is still nickel oxide, nickel oxide hydrophilic form a blank part. After the plate is wetted and inked, the ink is first transferred to the blanket and then transferred to the paper. After printing a batch of printed products, as long as the positive and negative electrodes of the plate cylinder and the electrolyte are reversed, the copper is returned to the electrolyte, and the next batch of printing plates can be produced.
Undoubtedly, the key point of this technology is to ensure the stability of the properties of the nickel oxide semiconductor, as well as the correct understanding of the electrolyte concentration and the control of the imaging laser head.
6, coating type digital reproducible flat printing plate making principle
The use of coating technology for the production of reproducible printing plates is a topic of long research time. The principle of plate making is to apply a layer of ink-receptive special polyester (this kind of polyester can become hydrophilic and soluble in water under laser irradiation) on the hydrophilic substrate, and then use the laser beam according to the original. The color separation data is imaged on the polyester layer. After the image formation, the printing plate was wetted and inked. The laser-irradiated polyester gradually dissolved in the fountain solution, revealing the following hydrophilic plate base. In this way, the plate base hydrophilic forming a blank part, polyester ink forming a graphic part. After a batch of printed products is printed, the polyester layer is removed chemically or mechanically, and then the polyester layer is re-coated on the substrate to prepare the plate for the next batch of printed materials. It is generally used in horizontal printing presses.
7. Ferroelectric Ceramic Digital Reproducible Flat Plate Platemaking Principle
To understand the principle of plate making of this type of plate, it is first necessary to understand the properties of the ferroelectric ceramic material. The ferroelectric ceramic is essentially a lead-zirconate-titanate crystal. The molecules of this crystal can be polarized to make the entire crystal show a band. Positive state. Therefore, ferroelectric ceramic materials have three states: positive, negative, and neutral. If the ferroelectric ceramic is in a neutral state, the ferroelectric ceramic can be converted into a charged state by an imaging system; if the ferroelectric ceramic is in a charged state, it can be returned to a neutral state as long as it is irradiated with heat. This ferroelectric ceramic material is plated on the surface of a plate cylinder, and it is possible to use this property of the plate to make a plate.
There are two methods for making a plate using this ferroelectric ceramic material:
1. The ferroelectric ceramic material exhibits a neutral state during the plate making process, and its internal molecular arrangement is random. The controllable electronic imaging system is used to image and polarize the corresponding portion of the ferroelectric ceramic according to the color separation data of the manuscript. Part of the liquid toner with opposite charge can be absorbed due to the charge, and then the toner is transferred to the paper. Since the molecular polarization of the ferroelectric ceramic material has a hysteresis effect, the printed plate of the next batch of prints is performed as long as the polarized ferroelectric ceramic is heated to return it to a neutral state. This plate making method generally employs a contact direct printing method.
2. With this method, the state of the ferroelectric ceramic at the beginning of plate making is a polarization state, which assumes a positively or negatively charged state, and then uses laser heat radiation to image the surface of the ferroelectric ceramic according to the color separation data of the manuscript and converts it into neutral. The ferroelectric ceramic forms the graphic part of the printing plate. The unirradiated part is still charged to adsorb the liquid toner. It is a graphic part on the printing plate. The printing roller and the printing plate are used when printing with this printing plate. Without contact, the interval between the two is generally less than 0.3mm, and the toner is attracted to the printing plate by the attractive force between the charges, and then the toner is transferred onto the paper through the blanket cylinder. After printing a batch of printed products, the next printing plate can be produced by applying power to allow the ferroelectric ceramic material to return to polarization.
Both of these methods are still in the experimental research stage and have not yet been put into production. From the above description, it can be seen that the key point of this platemaking technology is the development of liquid toners used and the promotion of technology.
8. Principle of "Reversible" Digital Reproducible Flat Plate Making
The latest research result of renewable digital plates is the use of "reversible" materials for plate making. The so-called "reversible" material can be understood as follows: the same material, under certain conditions it is hydrophilic, while under other conditions it has the property of ink affinity. For example, zirconate, which is a metal oxide, is hydrophilic under normal oxygen concentration. It uses laser irradiation to reduce its oxygen content. When the oxygen content is low enough to cross a critical value, it changes. Become a pro-ink nature. After heat treatment, it changes back to its original hydrophilic nature. Similar materials such as PTFE can also be reversed in nature. This "reversible" feature can just be used to make a reproducible printing plate.
Renewable digital plates are still a research topic, and more and more companies and research institutes have invested in the research of this topic. We have reason to believe that as an indispensable part of digital printing technology, renewable digital printing plates will receive more and more extensive attention, and more and more low-cost, high-quality and stable-performance practical reusable printing plates will be Study it out. (Duan Huawei, Xi'an University of Technology)
The plate cylinder used in this method of plate making is plated with a layer of nickel oxide, which has the properties of a semi-conductor, and sees that light becomes a conductor. When making a printing plate, first apply negative charge to the plate cylinder body, then apply a thin layer of copper ion-containing electrolyte to the nickel oxide layer with a coating device, and then irradiate the electrolyte with a laser beam (the laser spot is According to the color separation data of the original). The nickel oxide photoreactive part becomes a conductor, the electrolyte and the plate cylinder are switched on, and the copper precipitates on the nickel oxide layer. Precipitated copper ion forms a graphic part of the ink, where there is no copper ion precipitation is still nickel oxide, nickel oxide hydrophilic form a blank part. After the plate is wetted and inked, the ink is first transferred to the blanket and then transferred to the paper. After printing a batch of printed products, as long as the positive and negative electrodes of the plate cylinder and the electrolyte are reversed, the copper is returned to the electrolyte, and the next batch of printing plates can be produced.
Undoubtedly, the key point of this technology is to ensure the stability of the properties of the nickel oxide semiconductor, as well as the correct understanding of the electrolyte concentration and the control of the imaging laser head.
6, coating type digital reproducible flat printing plate making principle
The use of coating technology for the production of reproducible printing plates is a topic of long research time. The principle of plate making is to apply a layer of ink-receptive special polyester (this kind of polyester can become hydrophilic and soluble in water under laser irradiation) on the hydrophilic substrate, and then use the laser beam according to the original. The color separation data is imaged on the polyester layer. After the image formation, the printing plate was wetted and inked. The laser-irradiated polyester gradually dissolved in the fountain solution, revealing the following hydrophilic plate base. In this way, the plate base hydrophilic forming a blank part, polyester ink forming a graphic part. After a batch of printed products is printed, the polyester layer is removed chemically or mechanically, and then the polyester layer is re-coated on the substrate to prepare the plate for the next batch of printed materials. It is generally used in horizontal printing presses.
7. Ferroelectric Ceramic Digital Reproducible Flat Plate Platemaking Principle
To understand the principle of plate making of this type of plate, it is first necessary to understand the properties of the ferroelectric ceramic material. The ferroelectric ceramic is essentially a lead-zirconate-titanate crystal. The molecules of this crystal can be polarized to make the entire crystal show a band. Positive state. Therefore, ferroelectric ceramic materials have three states: positive, negative, and neutral. If the ferroelectric ceramic is in a neutral state, the ferroelectric ceramic can be converted into a charged state by an imaging system; if the ferroelectric ceramic is in a charged state, it can be returned to a neutral state as long as it is irradiated with heat. This ferroelectric ceramic material is plated on the surface of a plate cylinder, and it is possible to use this property of the plate to make a plate.
There are two methods for making a plate using this ferroelectric ceramic material:
1. The ferroelectric ceramic material exhibits a neutral state during the plate making process, and its internal molecular arrangement is random. The controllable electronic imaging system is used to image and polarize the corresponding portion of the ferroelectric ceramic according to the color separation data of the manuscript. Part of the liquid toner with opposite charge can be absorbed due to the charge, and then the toner is transferred to the paper. Since the molecular polarization of the ferroelectric ceramic material has a hysteresis effect, the printed plate of the next batch of prints is performed as long as the polarized ferroelectric ceramic is heated to return it to a neutral state. This plate making method generally employs a contact direct printing method.
2. With this method, the state of the ferroelectric ceramic at the beginning of plate making is a polarization state, which assumes a positively or negatively charged state, and then uses laser heat radiation to image the surface of the ferroelectric ceramic according to the color separation data of the manuscript and converts it into neutral. The ferroelectric ceramic forms the graphic part of the printing plate. The unirradiated part is still charged to adsorb the liquid toner. It is a graphic part on the printing plate. The printing roller and the printing plate are used when printing with this printing plate. Without contact, the interval between the two is generally less than 0.3mm, and the toner is attracted to the printing plate by the attractive force between the charges, and then the toner is transferred onto the paper through the blanket cylinder. After printing a batch of printed products, the next printing plate can be produced by applying power to allow the ferroelectric ceramic material to return to polarization.
Both of these methods are still in the experimental research stage and have not yet been put into production. From the above description, it can be seen that the key point of this platemaking technology is the development of liquid toners used and the promotion of technology.
8. Principle of "Reversible" Digital Reproducible Flat Plate Making
The latest research result of renewable digital plates is the use of "reversible" materials for plate making. The so-called "reversible" material can be understood as follows: the same material, under certain conditions it is hydrophilic, while under other conditions it has the property of ink affinity. For example, zirconate, which is a metal oxide, is hydrophilic under normal oxygen concentration. It uses laser irradiation to reduce its oxygen content. When the oxygen content is low enough to cross a critical value, it changes. Become a pro-ink nature. After heat treatment, it changes back to its original hydrophilic nature. Similar materials such as PTFE can also be reversed in nature. This "reversible" feature can just be used to make a reproducible printing plate.
Renewable digital plates are still a research topic, and more and more companies and research institutes have invested in the research of this topic. We have reason to believe that as an indispensable part of digital printing technology, renewable digital printing plates will receive more and more extensive attention, and more and more low-cost, high-quality and stable-performance practical reusable printing plates will be Study it out. (Duan Huawei, Xi'an University of Technology)
Basic Baby High Chair,Multifunction Baby Chair,Baby Sitting Chair,Unique Baby High Chair
Zhejiang Lamon Technology Inc. , https://www.babychaires.com