News
  • What Are the Main Advantages of Flexographic Printing? 21-01-17

    Flexographic printing  1. Simple equipment structure, easy to form a production line. In offset printing, gravure, flexographic printing equipment in the three major flexographic printing machine is the simplest structure. Therefore, the price of flexographic printing machine is relatively low, the printing enterprise equipment investment less. At the same time, because the equipment is simple, easy to use and operate, easy to maintain. At present, the vast majority of flexographic printing machine, with such as soup gold, varnishing, cutting, slitting, die-cutting, creasing, punching, window and other processing line, forming a production line. Greatly improve labor productivity.  2.A wide range of applications and substrates. Flexo printing can print almost all printed materials and use all substrates. Especially in the packaging printing of corrugated paper printing has a unique this.  Offset Printing Offset printing is mainly used for the printing of paper-based materials. Printing on plastic film has many limitations. Sheetfed offset printing machine printing width can be changed, more flexible. At present, the vast majority of web offset printing machine printing width is fixed. Its application is limited. The development of technology, web offset presses are constantly improving. Now has been successfully developed to change the printing width of the web offset printing machine. At the same time, the successful development of seamless roller web offset press.  The printing cylinder of this web offset printing machine is seamless, in this regard has been the same as the web gravure printing machine. Offset presses also continue to improve on the printing function. With the improvement and addition of some parts, it is possible to print corrugated board. With the improvement and addition of UV drying device, it is possible to print UV printed parts. The above improvements continue to expand the use of offset presses in the field of packaging printing. Offset printing with water-based ink will soon enter the practical application. Here offset printing is another step. Gravure printing Gravure printing, ink full of three-dimensional sense, in a variety of printing methods, the printing quality is the best. And printing quality is stable. Long life of the printing plate. Suitable for large quantities of printing. Gravure printing can print very thin materials, such as plastic film. However, gravure plate making is complicated and expensive, and its benzene-containing ink pollutes the environment. These two problems have affected the development of gravure printing. In particular, the reduction of a large number of large number of prints, short version while requiring a large increase in low-priced prints, so that gravure printing continues to lose market. Characteristics of UV Drying 6 Color High Speed Flexo Plate Making Machine 1. It is made of stainless steel shell, featuring in durability and won’t get rusty. 2. Adopt imp...

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  • Why Choose Digital Flexo Printing Plate? 20-12-28

    Flexographic printing is suitable for all kinds of substrates and has a wide range of applications. It is used on corrugated boxes, Tetra Pak, flexible packaging, labels, folding cartons, paper bags, paper cups, napkins, playing cards and other printing and packaging products. What is the difference between digital flexo printing plates and ordinary flexo printing plates? 1. Scattering and diffuse reflection is different The scattering and diffuse reflection of light in the exposure process is different, ordinary flexo plate in the exposure, ultraviolet light to pass through the vacuum layer, film base, emulsion layer and anti-halo layer, its total thickness is large, there are a more serious scattering and diffuse reflection problems. And digital flexo plate in the exposure, the light only through a layer of less than 0.001in the thick black coating, there is only a weak scattering and diffuse reflection phenomenon.     2. Exposure environment is different Ordinary plate making is exposed under vacuum conditions, while the digital printing plate is exposed in the air. Photopolymerization resin in the air and in the vacuum of the photopolymerization reaction mechanism is different, resulting in the printing plate dot shape, exposure tolerance and other properties of the printing plate is also different.   3. Point shape is different Dot reproduction range, ordinary flexo plate raised dot cross-section is round, the longitudinal section is trapezoidal, and the top of the dot flat, while the digital flexo plate raised dot is relatively small, and the tilt is small, the top of the dot is round, but not flat. The dot edges of flexographic plate for flexo printing are more rounded. And the edge of the dot on the ordinary flexo plate is clearly contoured. Clearly, contoured dot printing is easy to break the scratch, and the digital flexo plate on the dot, especially the high light point is not easy to appear in this situation, so the printing quality is good.   4. Different exposure tolerance The black coating on the digital flexo plate greatly improves the tolerance of the main UV exposure. Experiments show that the digital flexo plate main exposure time increased by 5 ~ 10min, the image on the printing plate part of the height of the bump without any effect, while the ordinary flexo plate is different, as long as the exposure time has a small increase, it will make the height of the graphic bump significantly reduced.  Exposure tolerance is conducive to the perfect shape of the dot. Because the digital flexo plate has a certain exposure tolerance, so there is no need to pay special attention to the highlight and dark tone points during exposure, but also to ensure that the highlight points are not lost and the dark tone points are not pasted. It is recommended that the main exposure time of the digital flexo plate is 10min, which is sufficient to ensure that the highlight point is not lost. In the production of the ordinary f...

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  • What Do You Know about Digital Flexo Plate Making Machine? 20-12-31

    Principle of Digital Flexo Plate Making Machine When making a plate, an infrared laser emitted by the image generator of the digital flexo plate making machine ablates the black absorption layer of the text portion, exposing the photopolymer resin layer underneath. Since the photopolymer layer is insensitive to infrared radiation, the emulsion layer is not affected by the laser ablation.  After laser ablation, the printing plate is fully exposed. The black coating in the blank area of the printing plate blocks the light so that the photopolymer layer in the blank area is not sensitive to light; while the photopolymer layer in the graphics area loses the protection of the black coating and undergoes a photopolymerization reaction, which forms the part of the final graphic. After exposure, digital flexo plates can generally be developed in the usual way, namely: solvent washing, drying, and finishing. However, some digital flexo plates need to be rinsed with water to remove the black coating before they are solvent treated. Exposure type of digital flexo plate making machine Digital Flexo Platesetters have two types of exposure: inner cylinder exposure and outer cylinder exposure. In the inner cylinder digital flexo plate making machine, the plate is kept on the inside of the cylinder during the exposure process; in the outer cylinder digital flexo plate making machine, the plate is kept on the outside of the cylinder during the exposure process. When the cylinder rotates at high speed, the exposure head moves laterally relative to the cylinder to expose the plate. At present, the flexo direct plate making machine is basically an outer cylinder, only small or medium-sized (30in, 40in) plate making machine has an inner drum. Digital flexo plate making machine is controlled to work by a Raster Image Processor (RIP). The RIP is the hardware or software that interprets the data coming from the front end of the computer and sends it to the laser typesetter. The RIP of an inner cylinder digital flexographic plate maker is interpreted in the PostScript language. It works on the same tasks and principles as the PostScript laser typesetter. It describes and interprets the page content sent from the application, creates a dot matrix image, and controls the laser ablation of the digital flexo plate making machine to record the page information on the plate. The raster image processor consists of two parts: the interpretation part and the control part. The interpretation part receives page information from the computer and encodes it for the control part; the control part is used to control the operation of the imaging system. The domestic digital flexo plate making machine manufacturers, represented by Suzhou Ollide, have been highly praised by domestic users for their high-quality products, price advantage over imported equipment, and perfect after-sales service. Olid, as a company engaged in the business of aniline printing plates, color photo paper, a...

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News
How to Deal with the Dirty Surface of Photosensitive Polymer CTP Printing Plate?

2020-11-23

Admin

At present, many newspapers across the country have introduced CTP computer-to-plate technology in order to improve publishing efficiency. Of course, the application of new technology is not entirely smooth. CTP computer-to-plate technology will inevitably encounter some problems, including the printing plate endurance is not ideal. , After printing on the machine, the layout is easy to be dirty and difficult to clean, and the overprint is not accurate.

Flexo plate making machine supplier suggests that you can consider three aspects when encountering the dirty problem of the CTP plate during printing: the quality of the plate, whether the plate making process is operated properly, and printing problems.

1. Plate quality

The transportation and storage conditions of CTP plates are relatively strict and have a certain shelf life. For example, it requires that it should be placed in a sealed packaging box before exposure, and the environment should be dry and cool, and only when the packaging box is selected under the irradiation of yellow light can it be opened for exposure and development. Its shelf life is generally one About years. Because the stability of the photosensitive layer of CTP plate material is relatively low, it is 1000 times lower than that of PS plate. Therefore, a little carelessness will affect the chemical properties of the CTP plate surface coating layer, so that the hydrophilic properties of the blank part of the plate surface after exposure and development will be affected, causing the plate surface to be dirty after printing.

For the CTP plates purchased in the early days, the printing plate produced by the flexo plate making machine would be dirty on a large area, and it was difficult to remove it, so it had to be replaced with a new plate. On the other hand, the printing plate produced under the same conditions as the newly purchased plate is very clean and there is no dirt on the plate. Repeated comparison tests show that there are problems with the quality of that batch of old plates. It is possible that the quality of the plate is not good when it leaves the factory, and it is also possible that the quality of the plate is deteriorated due to the operation of the plate in the process of transportation and storage that does not comply with the requirements of the specification. The solution is to require the manufacturer to ensure that the product quality, transportation, and storage process strictly follow the specifications.

2. Whether the plate making process is operated reasonably:

The insufficient exposure time of the CTP plate and insufficient developer concentration or development time will also make the hydrophilic properties of the blank part of the CTP printing plate not meet the requirements; this will also make the CTP printing plate easy to get dirty after printing on the machine.
Flexo Plate Making Machine
Here is a small experience: if we know that there is a problem with the quality of a batch of plates, or the concentration of the developer on the flexo plate making machine has dropped to a certain level, this situation will cause the CTP plate to be dirty after printing on the machine. , You can wipe a thin layer of 100% fountain solution stock solution on the surface of the printing plate before printing on the machine to achieve a more satisfactory effect.

This is based on the preconceived properties of the offset printing plate for oily substances or water-based substances, that is, if the printing plate comes into contact with which kind of substance first, the printing plate will have a certain priority affinity for that substance, and the fountain solution itself is water-based It can promote hydrophilic and oil-repellent properties in the blank part of the printing plate. This prevents the blank part of the layout from having an affinity for the ink to a certain extent, so as to achieve the purpose of removing dirt on the layout. Of course, this is only a remedy. The fundamental solution to the problem is that the exposure time, developer concentration, and development time of the CTP plate are appropriate, and the factors that affect the quality of the CTP plate material during transportation and storage must be eliminated.

3. Printing problem

The printing aspect is also directly related to the dirty problem on the CTPE printing plate. Improper adjustment of the pressure of the ink roller of the printing press will immediately produce a pasted plate, which is also easy to cause a dirty plate. If the quality of the CTP printing plate is qualified and the concentration of the fountain solution is appropriate, satisfactory results will be obtained as long as the ink roller and related pressure are adjusted.

Note: Because the PS plate cleaning paste is severely corrosive to the graphics and text parts of the CTP printing plate, it must not be used to wipe the CTP printing plate directly to remove the dirt on the layout. Wipe the printing plate with a dampening liquid stock solution to achieve a certain effect. In addition, if the hardness of the ink roller is too high or the encapsulation thickness is too thin, the CTP printing plate will be dirty on the entire plate. This is because the rubber layer of the ink roller is not elastic enough, and the friction force on the surface of the printing plate is very large, which causes the dirty plate.
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  • Photopolymer plate
    2.84mm Digital Flexographic Printing Polymer Plate

    1.Item 2.84mm Digital Flexographic Printing Polymer Plate   2.Description 1)Excellent dot and isolated line reproduction 2)Solid printing performance 3)High latitude of exposure and processing 4)Good ink transfer 5)High impression 3.Technical parameters Use: Flexo Printing                 Material: Photosensitive Resin Style: Positive                         Type: Flexographic Printing Plate Place of Origin: China (Mainland)          Brand Name: AOLIDE Model Number: DR284-II                        Color: Black Thickness: 2.84mm                                 Rigidity(Shore A): 45-48 Maximum line line/inch: 120                     Recommend relief depth(mm): 1.0-1.4  Image reproduction: 2%~98% Minimum isolated line: 0.15mm (0.006inch) Minimum isolated dot: 0.25mm(0.01inch) Main Application:Label、 Flexible package、Carry bag、 Folded paper box、Napkin、Beverage package 4.Process Parameters Type:DR284-II                                  Thickness(mm):2.84 Back exposure(seconds):25-40     Main exposure(minutes):12-20 Rinsing(minutes):5-8                        Minimum drying time(hours):1.5-2 Detackfying(minutes):5-8                Post exposure(minutes):5

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