Ink may be lighter to increase the weight of the ink to be measured. For example, add 2 g of the ink to be measured in a small beaker. Stir well and then use the color wheel to paint. If it is the same as the standard color, press (10+2):100= 10: x calculation, you can launch x = 100 × 10 ÷ 12 = 83.3 (g), indicating that the color ink color strength is only 83.3% of the standard color ink, it can be said that weak 16.7g.
Ink darkness can be added to the weight of white ink, if you add 10g standard white ink in a small beaker and the color version of the printing plate is the same as the standard color card, then press 10:(100+10)=10:x to push out the =110(g), The coloring power of the ink to be measured is 110% of the standard ink, and it can also be said that it is 10g.
The above x represents the weight of the white ink when a certain amount of white ink is added into a 10g of the test ink after meeting the standard tinting power color card. That is, the tinting strength is measured by the amount of white ink.
There is also a comparison method for the comparison of wet colors, that is, to measure the coloring power of the ink to be tested and the wet color of the ink that has passed the previous test to detect the wet color on the color wheel. Similar controls. This detection method eliminates the disadvantage of having a color shift between the wet color samples and the dry color samples and has a bad influence on the evaluation of the actual results. Since all of them are wet color samples and are adjacent to each Other, the contrast colors are convenient and the accuracy is higher.
After finishing the tinting strength and hue detection, remember to keep the wet and dry color samples when testing. In particular, the wet and dry color samples of the standard ink must be sealed and properly marked to prepare for the next inspection. When used. Because spot colors require color stability, the hue of the ink is required to be correct, and the tinting strength is required to be stable. The general standard is: ±10% can be acceptable, ±±5% is acceptable, and must not be too high or too low.
(3) Use of the color wheel The following points are worth noting when using the color wheel:
1 The pressure between the rubber roller and the anilox roller should be adjusted properly. If the pressure is too high, the two rollers will jam when the plate is used, the rotation will not work, it will be difficult to produce a uniform color sample, or the ink layer will be too thin; if the pressure is too small, there will be a gap between the two rollers. The phenomenon of ink leakage may occur, or the ink layer may be too thick to affect the evaluation of ink color.
2 After each edition is finished, the color wheel should be cleaned immediately and wiped dry with a clean dry cloth, otherwise the ink will quickly dry on the color wheel to confine the film and block the anilox roll, which is not easy to clean and affect the exhibition. The normal use of the color wheel shortens its service life.
3 When two wet color samples are used for parallel proofing on the color wheel, the distance between the wet samples should be controlled within 1 to 2 cm, and the amount of ink used should not be too much 0.3 to 0.6 g (if the color development wheel is large, the amount can be used. Corresponding increase).
If the distance between two wet specimens is too large, the distance between the two ribbons being shot will be far away, and the color difference between the two wet specimens will not be accurately assessed. On the contrary, if the distance between the wet specimens is too small, the printing When the phenomenon of ink mixing and ink mixing occurs, the two wet samples are mixed together and cannot be distinguished. The best pattern-making effect is that the two ribbons are tightly connected with no gaps and no obvious boundaries.
4 When making a plate, the force should be appropriate and the speed should be uniform. The angle between the color wheel and the plate paper should be 45°C or so. The color sample should be uniform and the ink color should be the same.
2. Detection of Ink Viscosity The viscosity of aqueous ink used in flexographic printing is relatively low, and the fluidity is relatively good. The method of detecting viscosity is also very simple. Only one viscosity cup and one stopwatch can be used to complete the detection of ink viscosity.
The specific operation method is as follows: First, the water-based ink is stirred evenly, then the viscosity cup is immersed in the ink, and then the viscous cup is raised at a uniform speed. When the viscous cup has just been pulled out of the ink surface, press the stopwatch to measure the outflow of the ink. When the ink has just stopped, stop the stopwatch immediately. At this time, the time value on the stopwatch represents the viscosity of the ink, the viscosity is high, and the number of seconds is large; the viscosity is low and the number of seconds is small. Because the temperature is different, the viscosity of the ink will also change, so the general detection temperature is fixed at 25 °C.
It is worth mentioning that there is no obvious correlation between the temperature and the color of the ink, but there will be some impact on the performance of the ink when printing on the machine.
3, the lightfastness of the ink The lightfastness of the ink is a property that the ink maintains a stable color after seeing light. Lights with poor lightfastness fade after a period of light exposure. Some prints meet the requirements when printed in a printing factory, and color shifts occur after a period of time at the customer's place. The reason for this is mostly because of this.
Here is a method to roughly detect the lightfastness of an ink.
Divide the actual color sample after printing or patterning into two parts, one part is exposed to sunlight for about 4 hours, the other part is placed in dark and dark place, or the color sample is folded in the sun and part of the printing face is placed upwards. Let sunlight shine, and a part of the printing surface is placed under the backlight. After 4 hours, the color deviation of the two color samples was checked. If there is a significant color shift, the ink has a poor light resistance.
When a printing company purchases ink, it should require the ink supplier to provide a product with accurate hue and stable coloring power, and a certain amount of safety stock should be kept.
Ink darkness can be added to the weight of white ink, if you add 10g standard white ink in a small beaker and the color version of the printing plate is the same as the standard color card, then press 10:(100+10)=10:x to push out the =110(g), The coloring power of the ink to be measured is 110% of the standard ink, and it can also be said that it is 10g.
The above x represents the weight of the white ink when a certain amount of white ink is added into a 10g of the test ink after meeting the standard tinting power color card. That is, the tinting strength is measured by the amount of white ink.
There is also a comparison method for the comparison of wet colors, that is, to measure the coloring power of the ink to be tested and the wet color of the ink that has passed the previous test to detect the wet color on the color wheel. Similar controls. This detection method eliminates the disadvantage of having a color shift between the wet color samples and the dry color samples and has a bad influence on the evaluation of the actual results. Since all of them are wet color samples and are adjacent to each Other, the contrast colors are convenient and the accuracy is higher.
After finishing the tinting strength and hue detection, remember to keep the wet and dry color samples when testing. In particular, the wet and dry color samples of the standard ink must be sealed and properly marked to prepare for the next inspection. When used. Because spot colors require color stability, the hue of the ink is required to be correct, and the tinting strength is required to be stable. The general standard is: ±10% can be acceptable, ±±5% is acceptable, and must not be too high or too low.
(3) Use of the color wheel The following points are worth noting when using the color wheel:
1 The pressure between the rubber roller and the anilox roller should be adjusted properly. If the pressure is too high, the two rollers will jam when the plate is used, the rotation will not work, it will be difficult to produce a uniform color sample, or the ink layer will be too thin; if the pressure is too small, there will be a gap between the two rollers. The phenomenon of ink leakage may occur, or the ink layer may be too thick to affect the evaluation of ink color.
2 After each edition is finished, the color wheel should be cleaned immediately and wiped dry with a clean dry cloth, otherwise the ink will quickly dry on the color wheel to confine the film and block the anilox roll, which is not easy to clean and affect the exhibition. The normal use of the color wheel shortens its service life.
3 When two wet color samples are used for parallel proofing on the color wheel, the distance between the wet samples should be controlled within 1 to 2 cm, and the amount of ink used should not be too much 0.3 to 0.6 g (if the color development wheel is large, the amount can be used. Corresponding increase).
If the distance between two wet specimens is too large, the distance between the two ribbons being shot will be far away, and the color difference between the two wet specimens will not be accurately assessed. On the contrary, if the distance between the wet specimens is too small, the printing When the phenomenon of ink mixing and ink mixing occurs, the two wet samples are mixed together and cannot be distinguished. The best pattern-making effect is that the two ribbons are tightly connected with no gaps and no obvious boundaries.
4 When making a plate, the force should be appropriate and the speed should be uniform. The angle between the color wheel and the plate paper should be 45°C or so. The color sample should be uniform and the ink color should be the same.
2. Detection of Ink Viscosity The viscosity of aqueous ink used in flexographic printing is relatively low, and the fluidity is relatively good. The method of detecting viscosity is also very simple. Only one viscosity cup and one stopwatch can be used to complete the detection of ink viscosity.
The specific operation method is as follows: First, the water-based ink is stirred evenly, then the viscosity cup is immersed in the ink, and then the viscous cup is raised at a uniform speed. When the viscous cup has just been pulled out of the ink surface, press the stopwatch to measure the outflow of the ink. When the ink has just stopped, stop the stopwatch immediately. At this time, the time value on the stopwatch represents the viscosity of the ink, the viscosity is high, and the number of seconds is large; the viscosity is low and the number of seconds is small. Because the temperature is different, the viscosity of the ink will also change, so the general detection temperature is fixed at 25 °C.
It is worth mentioning that there is no obvious correlation between the temperature and the color of the ink, but there will be some impact on the performance of the ink when printing on the machine.
3, the lightfastness of the ink The lightfastness of the ink is a property that the ink maintains a stable color after seeing light. Lights with poor lightfastness fade after a period of light exposure. Some prints meet the requirements when printed in a printing factory, and color shifts occur after a period of time at the customer's place. The reason for this is mostly because of this.
Here is a method to roughly detect the lightfastness of an ink.
Divide the actual color sample after printing or patterning into two parts, one part is exposed to sunlight for about 4 hours, the other part is placed in dark and dark place, or the color sample is folded in the sun and part of the printing face is placed upwards. Let sunlight shine, and a part of the printing surface is placed under the backlight. After 4 hours, the color deviation of the two color samples was checked. If there is a significant color shift, the ink has a poor light resistance.
When a printing company purchases ink, it should require the ink supplier to provide a product with accurate hue and stable coloring power, and a certain amount of safety stock should be kept.
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