The generation of the knife line has a direct relationship with the viscosity of the ink. In actual production, the higher the viscosity of the ink, the easier it is to produce cutting lines during printing. These cutting lines generally appear in two forms on printed products. The first type of knife line is a fine streamline, generally not too long, but appears intermittently on the printed product. The starting point of the fine streamline knife line is mostly close to the printed pattern, and the start of the knife line The starting point is generally thicker than the end. If it is not observed carefully in actual production, this fine streamlined knife line is easily overlooked. This streamlined knife line is often the root cause of quality accidents and must be paid attention to. There are several ways to solve this streamlined knife line, which is also a common method for printing employees, but it should also be determined according to the actual situation.

a. Grind a soft blade with a width of 5cm, a length of 15cm, and a thickness of 140um to be very smooth. Gently pick where the knife line appears. Under normal circumstances, this tiny streamlined knife line will be improved. This kind of operation is generally completed when the machine is running, which requires that you must be familiar with the operator to complete it, so as not to be self-defeating and cause unnecessary losses.

b. The most fundamental solution is to add an appropriate amount of solvent to the ink to reduce the viscosity of the ink. After the viscosity of the ink is reduced, the fine streamline blades are generally eliminated. This is because the viscosity of the ink decreases after the addition of the solvent, and the fluidity increases accordingly. Therefore, the fine streamlined blade line is also related to the deterioration of the fluidity. This should be noted.

The second type of cutting line is the printed pattern as the starting point, but the cutting line is concentrated, and it is relatively rough, and it appears regularly at the same position on the printed product, and often has to continue to the next color. This kind of cutting line is easy to be found . The reason for this knife line is that the viscosity of the ink is too high, the transfer point of the printing plate is poor, and the auxiliary agent in the ink is destroyed with the change of the ambient temperature, especially when the temperature is too high, a thin layer will form on the surface of the ink Dry solid layer, the ink layer accumulated between the printing plate and the squeegee blade will push up the squeegee blade for a long time, thus producing this kind of knife line. The solution to this knife line is to adjust the angle of the doctor blade first. Generally, the angle between the doctor blade and the printing plate is 60 °, but sometimes the angle between the doctor blade and the printing plate can be increased to about 65 ° In this way, the pressure of the doctor blade is increased accordingly. At the same time, add the appropriate amount of corresponding additives or solvents to the ink with high viscosity to reduce the viscosity of the ink and increase the fluidity of the ink. When adding solvent, the ink should be stirred according to the direction of the solvent. Another solution is to put the stirring in the ink tank; the roller, as the plate cylinder rotates, the stirring roller also rotates accordingly. Preventing ink layering on the surface of the ink is also a way to reduce the occurrence of knife lines. The above two solutions are used in conjunction with each other. In the absence of special circumstances, the above-mentioned concentrated thickness of the knife line will be effectively contained. It must be noted that the angle of the squeegee should not be increased too much to prevent damage to the brand roller .

Aquarium Air Pump

Air Electric Pump,Aquarium Air Pump,Air Pump Aquarium,Air Compressor Pump

HENGYUE INDUSTRIAL CO.,LTD , https://www.hetoaquarium.com