1) The adjustment of the squeegee knife When the squeegee is installed, it is necessary to adjust the axial parallelism: adjust the preliminary angle of the squeegee so that the blade is lightly pressed on the plate, and adjust the left and right sides of the blade to ensure the printing. This ink is uniform, so that it can accurately adjust the squeegee pressure and angle filling, which is an important part of the impact on printing quality.
In general, under the same angle, the greater the pressure of the blade, the better its ink-scraping performance, but the pressure of this assembly to operate the plate, the pressure is too small and the ink is not scraped, will cause the knife line, so the pressure of the blade should be abrupt, even if It should also increase slowly when pressurized.
Under the same pressure, the larger the angle of the blade is, the better the squeegee performance is. Similarly, if the angle is too large, the squeegee and the plate will operate seriously. If the blade is too small, the squeegee and the ink will be easily drawn.
Since the angle of the squeegee and the two affect each other, we can sum them up into one physical quantity, the pressure P between the squeegee and the plate, which is more intuitive.
After printing for some time, the contact area S between the squeegee and the printing plate will be increased due to wear. At this time, the knife line phenomenon will occur, and some of the squeegee blades should produce a large squeegee pressure F. According to the formula P=F/S, it is difficult to judge the change of pressure, we have to judge it. When the knife process exceeds MAX, the pressure P will decrease, that is, excessive knife will make the knife line problem more serious. Because the process of pressing the knife is a pressing process, the squeegee pressure is lower than the limit value, generally around 3-4Kg/cm3, and the angle is between 50 and 70 degrees. When the knife line appears, the angle may be steeper. Above 60 degrees, the pressure is greater.
After the scraper is used for a period of time, it must be polished again, according to certain rules. First of all, clean the blade holder and then expose it with a hard blade clip soft blade. Note that the distance between the two ends should be the same. When sharpening, the tool holder was clamped on a table, polished with whetstone, and polished at an angle of about 40 degrees. Then, it was roughly ground with 360 water sandpaper, and then finely ground with 1000 fine sandpaper. When the wear is severe, the blade must be replaced.
If the cutting lines appear to be relatively regular and obstruct the movement of the squeegee, it can be concluded that the squeegee is mainly caused by the adhesion of the squeegee and the blade, and is solved by grinding or replacing the squeegee and the foreign material on the back of the blade.
2, ink ink is the bearer of the print pattern reproduction, the central is composed of pigments, binders, fillers and additives, and its influence on the knife line is also outstanding.
Intaglio printing inks can be divided into: engraved gravure inks and gravure inks. Among them, the engraving and gravure printing ink is mainly used for printing valuable securities. However, the problem of the knife line in this article is mainly in the packaging field, so it is unnecessary to discuss it. Let's talk about gravure ink.
Photogravure ink is a volatile drying type. It is a typical liquid ink with good flow properties and low viscosity. It is generally composed of colorant, solid resin, volatile solvent, and additives. Some of the fineness, viscosity, dryness, hardness, and activity of the table are greatly influenced by the knife line. The following discusses the properties of the gravure ink in combination.
1) Fineness If the fineness of the ink is not enough, that is, the material is too large, it may be embedded in the scraper or damage the scraper, resulting in a knife line. The fineness of the ink itself is determined by the manufacturer. The ink manufacturer should be flexible, have no chemical reaction with the resin binder used, and have good flowability and properties during the development of the color. The printing factory should check the fineness of the ink when purchasing the ink, and use the fineness of the scraper to measure it with the detection method suitable for the conditions of the factory. Generally, the fineness of the gravure ink is about 15um. The smaller the fineness is, the smaller the cutting line is. favorable. In fact, the national factor is not only this step, the ink is mixed in the use of impurities, long-term use of the ink caused by long-term contact with the air oxidation of the resin cross-linked to form coarser particles will produce a knife line. For the long-term use of the tip regularly filter the ink in the ink tray or filter into the metal wire mesh in the ink circulation system, the recycled old ink should be filtered before use, the ink should be replaced when the ink is flocculated, and some help can be added. The solvent is thoroughly stirred to evenly disperse the particles. If conditions permit, a closed ink jet device can be used, which can greatly reduce the ink and air contact. (To be continued)
In general, under the same angle, the greater the pressure of the blade, the better its ink-scraping performance, but the pressure of this assembly to operate the plate, the pressure is too small and the ink is not scraped, will cause the knife line, so the pressure of the blade should be abrupt, even if It should also increase slowly when pressurized.
Under the same pressure, the larger the angle of the blade is, the better the squeegee performance is. Similarly, if the angle is too large, the squeegee and the plate will operate seriously. If the blade is too small, the squeegee and the ink will be easily drawn.
Since the angle of the squeegee and the two affect each other, we can sum them up into one physical quantity, the pressure P between the squeegee and the plate, which is more intuitive.
After printing for some time, the contact area S between the squeegee and the printing plate will be increased due to wear. At this time, the knife line phenomenon will occur, and some of the squeegee blades should produce a large squeegee pressure F. According to the formula P=F/S, it is difficult to judge the change of pressure, we have to judge it. When the knife process exceeds MAX, the pressure P will decrease, that is, excessive knife will make the knife line problem more serious. Because the process of pressing the knife is a pressing process, the squeegee pressure is lower than the limit value, generally around 3-4Kg/cm3, and the angle is between 50 and 70 degrees. When the knife line appears, the angle may be steeper. Above 60 degrees, the pressure is greater.
After the scraper is used for a period of time, it must be polished again, according to certain rules. First of all, clean the blade holder and then expose it with a hard blade clip soft blade. Note that the distance between the two ends should be the same. When sharpening, the tool holder was clamped on a table, polished with whetstone, and polished at an angle of about 40 degrees. Then, it was roughly ground with 360 water sandpaper, and then finely ground with 1000 fine sandpaper. When the wear is severe, the blade must be replaced.
If the cutting lines appear to be relatively regular and obstruct the movement of the squeegee, it can be concluded that the squeegee is mainly caused by the adhesion of the squeegee and the blade, and is solved by grinding or replacing the squeegee and the foreign material on the back of the blade.
2, ink ink is the bearer of the print pattern reproduction, the central is composed of pigments, binders, fillers and additives, and its influence on the knife line is also outstanding.
Intaglio printing inks can be divided into: engraved gravure inks and gravure inks. Among them, the engraving and gravure printing ink is mainly used for printing valuable securities. However, the problem of the knife line in this article is mainly in the packaging field, so it is unnecessary to discuss it. Let's talk about gravure ink.
Photogravure ink is a volatile drying type. It is a typical liquid ink with good flow properties and low viscosity. It is generally composed of colorant, solid resin, volatile solvent, and additives. Some of the fineness, viscosity, dryness, hardness, and activity of the table are greatly influenced by the knife line. The following discusses the properties of the gravure ink in combination.
1) Fineness If the fineness of the ink is not enough, that is, the material is too large, it may be embedded in the scraper or damage the scraper, resulting in a knife line. The fineness of the ink itself is determined by the manufacturer. The ink manufacturer should be flexible, have no chemical reaction with the resin binder used, and have good flowability and properties during the development of the color. The printing factory should check the fineness of the ink when purchasing the ink, and use the fineness of the scraper to measure it with the detection method suitable for the conditions of the factory. Generally, the fineness of the gravure ink is about 15um. The smaller the fineness is, the smaller the cutting line is. favorable. In fact, the national factor is not only this step, the ink is mixed in the use of impurities, long-term use of the ink caused by long-term contact with the air oxidation of the resin cross-linked to form coarser particles will produce a knife line. For the long-term use of the tip regularly filter the ink in the ink tray or filter into the metal wire mesh in the ink circulation system, the recycled old ink should be filtered before use, the ink should be replaced when the ink is flocculated, and some help can be added. The solvent is thoroughly stirred to evenly disperse the particles. If conditions permit, a closed ink jet device can be used, which can greatly reduce the ink and air contact. (To be continued)
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