The water-soluble solid photosensitive resin plate has a shorter plate making period, is simpler in operation, and is superior to a copper zinc plate in resisting the printing rate, the resolution, and the ink transfer performance, and occupies an increasingly larger share in the relief printing. It is because of its above advantages and the one-time investment of the plate-making equipment that the company has produced "plates" from the original professional plate-making factory to printing houses and individual operators. As the use units are getting smaller and smaller, most of them have not been trained in plate making operations, so problems often arise in production due to improper operation.
First of all, it should be made clear that the following issues may be caused by the intrinsic quality of the “plate”. It can be said that there is insufficient innateness. Therefore, users must first select quality products and manufacturers with stable quality. Some users choose to import "plate material" in order to avoid the problem of "plate material". However, due to the fact that imported "plate material" has a bendable roundness, it is only suitable for circular press printing, and it is flat and flat for round presses. Flattening printing is best done with domestic "plates" because the price is only about a quarter of that of imported "plates."
First, the printing process has low print rate, word drop, crack version 1. After eliminating the possibility of the “plate material” issue, this problem may be caused during the printing process. Resin printing belongs to light printing, which is a polymer material, so the prepared version is wear-resisting and not pressure-resistant compared to the metal plate. When the upper plate looks for pressure, it must be small to large, and once it is large, it will crack. The edition, if the edition does not operate properly, will have the situation that pulls the edition in the printing process, the shear force is too big to produce the cracked edition, loses the character, therefore must pay attention to the pressure in the printing.
2. In reality, this kind of problem is caused by the reasons of plate making. It is due to the lack of a good grasp of the "drying" link in operation. The appearance of the finished version is not a problem, but because it is not completely dried, the hardness of the plate cannot be achieved, and the normal friction cannot be resisted during the printing process. The layer is quickly ground and the graphics and writing are both Become "fat", and India's imprint rate dropped significantly, can not be printed again; due to lack of drying, so that the performance of the adhesive layer between the resin layer and the substrate is reduced, there is a phenomenon in the normal printing off; due to insufficient drying Moisture remains as a small molecule in the resin, making the resin layer similar to a "soda cracker." It is crispy and slightly cracked. As long as the plate-making operation according to the requirements can avoid this problem, drying temperature 70 °C ~ 80 °C, time 30 minutes or more, the earth sub-panel, to add long time.
Second, the words appear in the process of plate-making. After eliminating the possibility of the "plate material" problem, this problem was caused by the length of exposure time. Since the photosensitive layer of the resin plate material has a thickness of 0.85 mm or more, when the exposure time is insufficient, the bottom of the photosensitive layer cannot be sufficiently cross-linked and solidified, and at the same time there is no large trapezoidal trapezoid formed by scattering of light, so the water is developed. At that time, the kind of trapezoid on the big bottom was hard to stop, and there was a phenomenon of word drop and line bend. Another reason is that due to the plate material or water temperature and other reasons, the washing time is too long, and the phenomenon of word drop and line bend occurs. When the exposure time is too long, due to the scattering of light, the bottom formed a large trapezoidal slope. Big, and paste version.
2. This situation is also caused by the film's "thin, thick, transparent" and positive and negative. Attaching the exposure of the film is a process of inducing a chemical reaction of the “plate” photosensitive layer, so it has strict requirements for the film, that is, the transparent part must be absolutely transparent, the density is below 0.05, and the density of the blocked light is 3 the above. When the light-transmitting portion has a “cockroach”, it will cause underexposure, and the word drop, line bend, when the density of the light-blocking portion is low, the weight of the light-blocking portion will not be developed, and the light will cause the line to be washed out and the paste will die.
When the negative film is reversed, when the non-positive negative image is plated, the film surface of the negative film is not covered on the photosensitive layer of the plate material by exposure, but the medicine film faces up incorrectly, and a layer of film is separated between the two photosensitive layers. Colorless and transparent polyester polyester film layer, when exposed, the light passes through the film layer immediately after it scattered through the polyester film layer, so the word and line of the pen is equally thickening, resulting in paste version.
3. This problem is caused by the light source. Generally, the photosensitive wavelength range of the resin plate is in the range of 300 to 400 nm. The wavelength emitted by the light source selected by the user for the exposure should be mainly in this area. When the light source is not the same, the exposure time is very large, but it is still due to underexposure and off words, line bends. Some light sources exposed the word line pen strokes appear "shoulder" and paste version. In addition, after the development with more floating water drying will also cause the word off, line bends; exposure of small suction force can not make the film with the photosensitive layer of the plate material will also cause a full or partial paste phenomenon .
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