Preparation of ImageOn before lamination to the printing plate
Before laminating the ImageOn film to the printing plate, cut the ImageOn film to a slightly larger size than the printing plate.
Special care should be taken when handling ImageOn film, because improper handling will make ImageOn film uneven, which will lead to unnecessary results in the final printing.
In this way, ImageOn emulsion can be firmly attached to the printing plate, so that the plastic film support layer of the film can be easily removed. As long as the ImageOn film is cut from the roller, it is curled in itself. The support layer to be peeled is located on this naturally curled inner surface. To remove the internal plastic support layer, place the ImageOn film between the thumb and index finger, and gently separate the thumb and index finger, so that the texture of the thumb print will grab the edge of the support layer and curl the support layer back. This technique takes time and skill to master.
The best solution is to wrap the corner of the ImageOn film, just like when you read the book, roll up the corner of the book, and rub the folded part until the support layer is separated from the ImageOn emulsion layer. Make sure to remove the inner peeling support layer instead of the outer polyester film layer. The inner plastic peel-off support layer has a soft feel, like a gladiolus bag; the outer polyester film layer has a brittle feel, like cellophane.
Then, place ImageOn on the fairly smooth surface of the press platform at all times. This smooth laminated surface is made of stainless steel or Lexan. If there are slight scratches or defects on the laminated surface, the ImageOn film will not be printed and will be noticed in the final printing.
Then, the ImageOn emulsion was evenly sprayed onto the printing plate by means of a plant sprayer, and this spray contained rubbing alcohol and water.
ImageOn Laminating Agent
Although it is recommended to use an alcohol aqueous solution composed of one part of rubbing alcohol and three parts of water in the lamination technology, it is still possible to stick the ImagOn film with water alone. If water is used as a laminating agent, it is recommended that the printing plate be dried for several hours before use.
Some pre-etched or reused layouts require a stronger aqueous alcohol solution so that ImagOn can paste more effectively. The higher the alcohol content in the spray, the harder it is to work, because ImagOn will stick to the printing plate particularly quickly.
Laminate ImagOn onto the printing plate
A copper plate polished with 320-mesh wet-dry sandpaper will be raised 2 inches and parallel to the wet ImagOn film, and the plate will slowly drop to the film surface.
The edges of the ImagOn film are cut with a very sharp knife. Note: Do not make contact with the etching table. Make sure not to cut the knife in this way, as this will distort the laminate surface on the etching press platform.
When the excess ImagOn film is cut off, the etched blanket drops to cover the entire printing plate, and then prints in the same way. In this way, the printing press consists of a printing plate with ink on foot. However, it is important to ensure that this action must be completed slowly. During the lamination process, the speed of the printing press platform moving across the platen roller should be 1 foot every 12 seconds. Normally, the etched fabric is used and the pressure of the printing machine is slightly stronger than that required for printing high-quality products.
Once the ImagOn film has passed the printing machine, the edge of the ImagOn film should be cut to ensure that the ImagOn emulsion is aligned with the edge of the printing plate. To ensure that the knife edge is sharp, it must be cut in such a way -The cutting action cannot cause the edge of the ImagOn film to warp from the printing plate. This cutting action is very important. The printing plate is now ready for exposure.
Exposure to ImagOn Various types of UV light sources can be used to expose ImagOn film. Although sunlight can expose ImagOn, it is almost impossible to obtain a constant result. Depending on the season and the time of day, the exposure time of sunlight can vary from a few seconds to a few minutes. Although the exposure time of other types of commercial exposure equipment also varies from seconds to minutes, it can produce good and constant results. In order to optimize the image effect, the most important thing is to strictly control the exposure. In addition, a good vacuum design is used for the exposure unit to make good contact between the positive film dot film or line draft and ImagOn emulsion.
For an efficient point light source exposure device with optical integration, there is no real alternative. Because many commercial printers no longer use the relatively old technology of point light source exposure device, but use exposure equipment that is relatively easy to provide. It is recommended to call all the printing owners around you by telephone yellow page book to inquire whether they have a plate torch to be sold. Avoid using screen printing exposure devices that use fluorescent light sources because these light sources do not produce good results for ImagOn.
Exposure time
The vacuum platform uses a 400W mercury vapor lamp, which is 14 â€away from the vacuum platform. The exposure time varies from 15 seconds to 1.5 minutes depending on the template to be exposed. The exposure time of a domestic, 1000W, metal halogen light source exposure device From 3 seconds to 20 seconds. These light sources can produce good results and can be found in any industrial electrical or lighting store. Make sure that the mercury vapor and metal halogen lamps are clean. If you are assembling your own exposure device, make sure to have Qualified electrical engineers perform suspension installations and must meet local safety certification standards. In addition, it is very important to ensure that the human eye is not exposed to light output by high-density UV light sources. It is best to use this Designed in one way: the eyes will not be directly exposed to the UV light source.
No matter what exposure system is used, the most basic is to conduct step-by-step testing to determine the correct exposure time for various applications and procedures related to gravure platemaking technology. Once the optimal exposure time of various gravure platemaking technologies is obtained, the optimal output results will be obtained for each element in each technology. It is important to understand this concept.
For any exposure device, determining the ideal exposure time is to do a series of test exposures to determine the best results. To determine the best exposure time, test samples should be made and printed in gravure. By doing these test versions, you not only develop these printing plates and draw conclusions from them, but also have a deep potential understanding of the Australian printing plate technology. Once these "optimal" exposure times are determined, it is recommended to stick them on the side of the exposure device for future reference.
Peel the top polyester film from the ImagOn coated plate
Before the exposed ImagOn printing plate is developed, the top polyester film layer is peeled off. Some technologies-like Howard-Type (polyester film peeling)-require peeling the polyester film before exposure. In both technologies, the stripping technique is the same. Open the handle and flick the edge of the ImagOn coated plate to peel the polyester film. Once the edge of the polyester film is lifted, peel it off from the printing plate.
ImagOn Developer
Only use all kinds of anhydrous soda ash (sodium carbonate).
Add 10 grams of soda ash (approximately 1 teaspoon) to about 4 tablespoons of hot water until the powder is dissolved. Water at room temperature is added to this dissolved soda ash solution to bring the total amount of solution to 1 liter. The working temperature of the developer should be 65-70uF. The solution is then added to the developing tank.
For ImagOn development, it is recommended to wear rubber gloves during the development process, because repeated use of the developer will irritate the skin, resulting in an inflammatory reaction on the skin of the hand. Because the developer is an alkaline solution, the most important thing is not to splash the developer into the eyes. For this reason, it is recommended to protect the eyes.
If the polyester film on the top of the emulsion layer has not been peeled off, it must be peeled off the surface of the printing plate of the ImagOn coated part before development. Place the plate in the developer solution and wipe with a sponge for about 2 minutes.
Knowing exactly when the image development is completed is an empirical issue based on the visual observation and tactile sensation of the image during the development phase. The unexposed areas of ImagOn are revealed by the developer. After the unexposed ImagOn was revealed, the ImagOn emulsion left unevenness. After the printing plate is completely developed, it is washed with water at room temperature, and then the remaining water on the printing plate is removed with a rubber roller.
Then send the printing plate to dry. The drying methods are: forced drying using a hair dryer, or natural drying.
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