1. The effect of the squeegee
The hardness of the squeegee is lower than the hardness of the chromium layer on the surface of the printing plate. If the hardness of the squeegee is too high, it will accelerate the wear of the plate and cause scratches: If the quality of the squeegee is poor, it will wear out in a short period of time, resulting in the ink of the layout can not be scraped clean, there is a knife line At this time, frequent adjustments and tool changes are required.
When the gap of the squeegee blade is damaged, there will be regular left and right moving blade lines, which are easier to identify. If the gap on the squeegee is fine, it can be polished with whetstone or fine sandpaper until it is smooth and smooth. If the gap is large, a new squeegee needs to be replaced. When replacing a new knife, the accumulated ink of the pressing blade and the knife groove must be thoroughly cleaned to avoid affecting the smoothness of the squeegee blade installation, and the length of the squeegee blade that exposes the pressure blade part must be the same, about 5 mm. During the printing process, some squeegee blades need to run in conjunction with the plate for a long time to achieve a good squeegee effect. At this time, the squeegee blade can be smoothed with metallographic sandpaper so that the squeegee can reach the squeegee. Better squeegee effect, and help improve production efficiency.
Second, the poor flatness of the squeegee installation can also result in a printed knife line. Therefore, when installing the squeegee, it is necessary to ensure smoothness and evenness of the squeegee. In addition, the pressure and angle of the squeegee knife also have a great influence on the print knife line. When printing, according to the degree of squeegee on the layout and the inking condition of the printed matter, the angle and pressure of the squeegee should be properly adjusted so as to achieve a good squeegee effect, thereby reducing the occurrence of print knife line failure.
It is suitable to use self-sharpening squeegee with close material and moderate hardness. The operation should pay attention to grasp the angle and pressure of the squeegee, so that not only can the ink be scraped clean, but also can reduce the wear of the squeegee on the plate and the wear of the squeegee itself, thereby increasing the plate and squeegee The life span reduces the production of knife lines.
2. Effect of solvents
In the printing process, solvents are often used to adjust the viscosity and dryness of the ink. In actual operation, the solubility should be as strong as possible. High volatilization solvents such as ethyl acetate and isopropanol. Different types of inks should use different kinds of solvents. If the solvent is used improperly, the ink will not dissolve sufficiently and will stick together. Once it adheres to the squeegee, it will form a knife line.
This knife line is usually dark, sometimes not. The use of gold ink is more common when printing solid blocks. Since gold ink is made of gold powder, gold transfer oil and solvents, the metal particles are heavy and easy to precipitate. If the solvent used has poor solubility, stirring is not necessary. Full, metal particles can accumulate due to uneven distribution. If it stays at the edge of the squeegee, it will form a thick dark line. The characteristic of this dark line is that it disappears after a period of time and then it forms again, which seriously affects the quality of the printed matter. This type of knife line is difficult to eliminate in the printing, need to start from the roots of preparation work before printing and down time, deployment of ink using the appropriate solvent, fully stir to fully dissolve, keep the ink during printing a good cycle.
The hardness of the squeegee is lower than the hardness of the chromium layer on the surface of the printing plate. If the hardness of the squeegee is too high, it will accelerate the wear of the plate and cause scratches: If the quality of the squeegee is poor, it will wear out in a short period of time, resulting in the ink of the layout can not be scraped clean, there is a knife line At this time, frequent adjustments and tool changes are required.
When the gap of the squeegee blade is damaged, there will be regular left and right moving blade lines, which are easier to identify. If the gap on the squeegee is fine, it can be polished with whetstone or fine sandpaper until it is smooth and smooth. If the gap is large, a new squeegee needs to be replaced. When replacing a new knife, the accumulated ink of the pressing blade and the knife groove must be thoroughly cleaned to avoid affecting the smoothness of the squeegee blade installation, and the length of the squeegee blade that exposes the pressure blade part must be the same, about 5 mm. During the printing process, some squeegee blades need to run in conjunction with the plate for a long time to achieve a good squeegee effect. At this time, the squeegee blade can be smoothed with metallographic sandpaper so that the squeegee can reach the squeegee. Better squeegee effect, and help improve production efficiency.
Second, the poor flatness of the squeegee installation can also result in a printed knife line. Therefore, when installing the squeegee, it is necessary to ensure smoothness and evenness of the squeegee. In addition, the pressure and angle of the squeegee knife also have a great influence on the print knife line. When printing, according to the degree of squeegee on the layout and the inking condition of the printed matter, the angle and pressure of the squeegee should be properly adjusted so as to achieve a good squeegee effect, thereby reducing the occurrence of print knife line failure.
It is suitable to use self-sharpening squeegee with close material and moderate hardness. The operation should pay attention to grasp the angle and pressure of the squeegee, so that not only can the ink be scraped clean, but also can reduce the wear of the squeegee on the plate and the wear of the squeegee itself, thereby increasing the plate and squeegee The life span reduces the production of knife lines.
2. Effect of solvents
In the printing process, solvents are often used to adjust the viscosity and dryness of the ink. In actual operation, the solubility should be as strong as possible. High volatilization solvents such as ethyl acetate and isopropanol. Different types of inks should use different kinds of solvents. If the solvent is used improperly, the ink will not dissolve sufficiently and will stick together. Once it adheres to the squeegee, it will form a knife line.
This knife line is usually dark, sometimes not. The use of gold ink is more common when printing solid blocks. Since gold ink is made of gold powder, gold transfer oil and solvents, the metal particles are heavy and easy to precipitate. If the solvent used has poor solubility, stirring is not necessary. Full, metal particles can accumulate due to uneven distribution. If it stays at the edge of the squeegee, it will form a thick dark line. The characteristic of this dark line is that it disappears after a period of time and then it forms again, which seriously affects the quality of the printed matter. This type of knife line is difficult to eliminate in the printing, need to start from the roots of preparation work before printing and down time, deployment of ink using the appropriate solvent, fully stir to fully dissolve, keep the ink during printing a good cycle.
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