In the process of making a printing plate, sometimes the quality of the printing plate is unqualified due to the exhaustion of the printing machine. Especially when making a reticulated printing plate, a part of the air is left between the negative film, the PS plate and the glass plate of the printing machine, so that the three of them cannot be closely adhered together in all directions, resulting in exposure of the printing machine , The light can not be irradiated to the photosensitive layer of the PS plate through the negative film normally, and the printing plates made are mostly flower plates. For this reason, I have accumulated several solutions in my usual work, and I now summarize them for your reference.
1. Slapping
When the plate-making machine draws air in the normal pumping time, the operator finds that some gas remains between the bottom plate and the glass plate when pumping, or gathers or spreads there to swim, and the pumping machine is unable to pump. In this case, the operator can use the slap method, that is, to use the force used to shoot the unbreakable glass plate as appropriate. While the plate-making machine is pumping, the operator slaps at the concentrated area of ​​the air The upper surface of the glass plate should disperse the remaining air as much as possible and not get together. It's better to follow the diffused air and shoot the glass plates as much as possible to spread them all around. This, combined with the function of the air extractor, can quickly drive the air out of the range of the film, which can do more with less. . Never run in front of the diffused air to tap the glass. This will cause the air that has just scattered to come back together again. If tapping in the normal order still fails to achieve the goal, it is best to extend the pumping time, so that you can also get satisfactory results. Moreover, the current plate-making machine is mostly program-controlled. Under normal circumstances, the second pumping will not affect the entire plate-making process, so that the operator can have enough time to pat. The main reason for this similar situation is the large area of ​​the film. The operator did not check whether the film is close to the front of the PS version when placing the film. Sometimes the negatives are spliced ​​on the base, which will also create a certain gap between them. This situation will also cause the phenomenon described above, and the treatment method is similar to the above.
2. Tile method
When the operator puts the film, if he is careful, he sometimes finds that the contact between the film and the front of the PS version is not strict enough. The phenomenon it shows is that the surface of the film is uneven on the PS version. At this time, if you close the glass frame and start pumping, the pumping phenomenon mentioned in the tapping method will appear. The way to solve the similar problem is to first fix the front of the negative film, fix it with transparent tape, then press the fixed film position with one hand, and gently flatten the negative film in sequence in order with the other hand, so that the negative film and PS The plates are tightly bonded, then close the glass frame and press tightly, and then start pumping. A similar situation occurs, the main reason is that the area of ​​the negative film is too large, or the operator damaged the negative film due to human factors such as rolling up the negative film during the transfer of the negative film. The precautionary measure is to put the film flat in a bag before transferring so that it does not bend, then the film will not affect the quality of the printing plate during the plate making process.
3. Padded paper method
When the operator finds that the elasticity of the air-cushion blanket on the plate-making machine is insufficient, it can be solved by adding padding paper. The pad paper used is generally 80g double-adhesive paper. When adding pad paper, it should be noted that the pad paper used is preferably a whole sheet, not spliced; the pad paper is placed directly under the PS version and cannot be attached to the air cushion blanket diagonally. When working, you should try to add paper one by one slowly according to the actual situation. You cannot suddenly add many sheets (up to 6 in my experience), which will damage the printing machine, and sometimes even add more paper due to the pad. The glass plate was crushed. The gradual increase of padding paper can make the glass plate have a process of adaptation, which is also conducive to the operator to master, and it is not easy to damage the glass plate. With the gradual increase of pad paper, the elasticity of the air cushion blanket can be increased in disguise, so that it can reach the strength required for the printing plate, and it can also allow the operator to accumulate certain work experience for later use. In a similar situation, the main problem lies in the printing machine:
â‘ Because the air cushion blanket has lost the elasticity required for normal work after long-term use, the first emergency measure is to add cushion paper to make up its elasticity, and then replace the air cushion blanket afterwards;
â‘¡ There is a problem with the air extraction machine, which results in insufficient air extraction and prevents the air cushion blanket from working properly. The treatment method is to add cushion paper to replace the insufficient air extraction first, and then repair or replace the air extraction machine.
4. Multiple pumping method
The current plate-making machine is mostly program-controlled, which is characterized by: as long as each program is set, it does not have to worry about the operator, and when the time set by the program, it automatically works according to the program. In this way, if the time for exhausting is sometimes reached, but the air has not been exhausted, and the negative film has not been attached to the PS plate and the glass plate, the plate-making machine will automatically enter the next program, so that the prepared plate is not qualified. Therefore, the operator should pay more attention when making the printing plate. When it is found that the pumping has not been exhausted, it should immediately stop and perform a second pumping before the next program starts (when the pumping time will be exhausted). If you find that the effect is not satisfactory, you can also pump again. This will not affect the quality of the printing plate, nor will it affect the normal working order of the plate-making machine. A similar situation occurs, mainly due to machine causes and human factors. Machine reason: There is a circle of rubber pads on the edge of the air cushion rubber cloth. This rubber pad has a certain height and a certain hardness. When the temperature is low (such as winter), the rubber pad will shrink slightly and the hardness will be relatively strengthened. , So that under other conditions unchanged, there will be a certain gap between it and the glass plate, so it will affect the normal pumping time; sometimes due to the overdue use of the rubber pad, making it elastic Reaching the requirements for normal work will also affect the normal pumping time. If a similar situation occurs, you should gently press the glass frame with your hand within the normal pumping time to increase the pressure of the glass plate frame, so that the glass plate frame can be sucked, or increase the temperature in the room, so that the elasticity of the rubber ring becomes Strong, the hardness becomes weak, or replace the rubber band. The human factor is mainly due to failure to grasp the truth of this negative film in advance and setting the wrong pumping time. The solution is to re-determine the pumping time according to the actual situation.
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