Rubber printing plate, paste version troubleshooting
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Flower plate and paste plate are one of the most common failures in offset printing. It is a guarantee to improve the quality of printed products and reduce the rate of scrap products. The following causes the common causes of the flower and paste plates to be summarized, and propose corresponding solutions for your reference.
1. Flower version
(1) The amount of water supplied is too large. It can be solved by reducing the angle of the bucket roller or reducing the speed of the bucket roller.
(2) There is too much water in the water gelatin. The water roller is operated in a "suspended water" state to consume excessive moisture absorbed by the water rubber velvet, or to scrape off excess water in the water velvet with a squeegee.
(3) The ink is emulsified severely. Try the replacement ink.
(4) The pressure between the water roller and the printing plate is too large. Reduce the pressure of the water roller.
(5) The pressure between the inking roller and the printing plate is too small. Increase the pressure of the ink roller.
(6) The printing time is too long. Problems from the plate must be completely resolved by replacing the plate.
2. Paste
(1) Insufficient water supply. The amount of water can be increased by increasing the angle of the bucket roller or increasing the speed.
(2) There is less water in the water bucket, resulting in insufficient water supply. This type of failure is most likely to occur when using manual watering. The solution is to add water to the water bucket to ensure adequate water supply.
(3) The water transfer roller or the water roller has serious wear and tear, which causes poor water supply. To replace the water gelatin.
(4) Oily impurities such as ink adhere to the surface of the bucket roller, and no water is transmitted due to the repelling of the ink. Wipe the bucket roller clean.
(5) There are too many inks on the surface of the water rubber velvet or the water roller, which causes the water to pass. After cleaning the water or the water roller, the problem will be solved.
(6) The pressure between the water rollers or the pressure between the water roller and the printing plate is insufficient. Try to adjust the pressure.
(7) The pressure between the inking roller and the printing plate is too large. Adjust the pressure.
(8) The amount of ink is too large. It is necessary to reduce the amount of ink supplied.
(9) The inking roller is pressed too early. You should first get enough water and then apply ink.
(10) The surface of the printing plate is exposed, resulting in poor hydrophilicity. The plate must be replaced.
In the offset printing, the flower plate and the paste plate are not related to the printed version, but in the end, the ink is not balanced. Practice has proved that the best balance of offset ink and water balance is to use as little water as possible on the basis of not being dirty or dirty, except for waterless offset printing. Correctly mastering the balance of ink and water can print good products.