Positive PS version failure analysis - low resistance to India

Fifth, PS version of India's low resistance:

Normal use of the PS version of the print resistance is generally about 5-10 million, and after the copy of the PS version of the print can be increased by 3-4 times; and some manufacturers use the PS version of the printer is very low, only 2-3 million India, even with only a few thousand prints on the edition, here in addition to the quality of the PS itself, the printing manufacturers to correctly master the PS version of the plate making method and offset press operation method is also of utmost importance. The general causes of the decline in the printing resistance of the PS plate include the following aspects:

1, due to excessive overexposure during plate making, causing the adhesive layer to become blemishes, and the resistance to printing force decreases. The positive solution method should measure the exposure time to determine the correct exposure time, and at the same time master the rules of the printing plate: that is, the high voltage of the film when the printing plate, the printing time is properly shortened, and the voltage is low, then the printing time is long. When developing, the developer concentration is high, the development time is appropriately shortened; when the concentration is low, the development time is long. The developer temperature is high, the development time is appropriately shortened, and when the temperature is low, the development time is long, generally not exceeding 1 minute. If the density of the blank part is high, try to use the principle of multiple exposure and less display.

2. When the density of the original graphic part is too low or uneven, resulting in light transmission or partial light transmission, the exposure time should be reduced when the density is low. The original plate and the PS did not fully adhere to each other during the printing. Increase the vacuum or add a thin wool under the PS plate.

3. After the printing plate is prepared, it should be kept from light as much as possible. In the case of no ink extraction, if it is too long in the workshop, the photosensitive layer is easily degraded by white light or daylight. Generally, the PS plate is placed in a brightly lit workshop or fluorescent lamp for 3-4 hours. The light energy is sufficient to completely photodegrade the photosensitive layer on the PS plate, and therefore it is required that the ink plate should be processed in addition to printing plates that are eager to be printed on the machine. In addition, during the printing process or in the middle of a stoppage, the light should be avoided as much as possible to avoid photolysis by strong light.

4, fountain solution performance is poor, inappropriate layout, or layout contact with the solvent and acid, alkaline substances and destroy the photosensitive layer.

5, paper, alkaline or acidic or grit, off powder, hair loss, printing impurities accumulated on the rubber cloth so that corrosion, wear and tear. Although the PS version of the oxide film is very hard, but the PS version of the aluminum plate base is relatively soft, PS plate surface oxide film, the most afraid of sand crushed, once the pressure ring is difficult to repair, so pay special attention to prevent sand pressure ring PS version .

6, offset printing blanket aging, hardened without elasticity, easy to wear the printing plate.

7. The offset printing machine is seriously worn or has not adjusted the gap of the roller. When the line speed is inconsistent during operation, there is a slip producing a bar, which makes it easy to fall out of the printing plate.

8. If the pressure of the offset press is too large or the liner is not suitable, the pressure of the ink roller is too high, which will aggravate the wear of the printing plate and cause the plate-off. This is the main reason for the decrease of the print volume.

9, when the next machine version and then on the machine when the graphic part does not absorb ink, the blank part of the dirty, mainly under the next version of the plate when the layout is not clean; in addition to wipe the protective rubber is not erased or too thin protective plastic, and protective plastic Acidic deterioration causes corrosion of the layout. If the PS version is not used without light for a long time, it will reduce the print volume. Therefore, under the machine version should be thoroughly cleaned layout, wipe the protective plastic and blow dry, protected from light and moisture, to avoid printing failures and increase the amount of print.

Source: China Packaging and Packaging Network

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