In the past two years, many flexible packaging companies have carried out the test of film gravure ink. During this period, many problems and difficulties have been encountered. Some of the experiences of the domestic soft-packing enterprises in the gravure ink test of the film are now in progress. Sharing with you, I hope that the majority of industry people will take a detour and realize the application production of film gravure ink as soon as possible.
Control focus
Color difference
Color difference control is one of the important contents in the use of all inks. According to experience, the color difference of film gravure ink is 3 during use, but for film packaging with special use requirements, it should be changed according to the actual situation. The color difference of the ink. The color difference control of the film gravure ink is affected by many factors such as the fluidity and transparency of the ink, the type of the printed film, and the like. Among them, the fluidity of ink and wash has the most obvious influence on the chromatic aberration. To achieve the true reduction of ink color, it is necessary to fully ensure that the fluidity of ink is within a certain range.
Viscosity
The control of the viscosity of the film gravure ink is the key point that needs to be broken in the application process, and it is also difficult. Under normal circumstances, the viscosity of the film gravure ink should be controlled at 0.15 ~ 0.30s (25 ° C). If the viscosity is too high, there will be poor ink transferability, uneven ink color, etc., and even serious consequences such as dirty or paste; if the viscosity is too low, the dot will increase, the edge of the product will be burred or the color will be too light. , the edge is not true and so on.
Thixotropy
The thixotropic thixotropy of the film gravure ink should be controlled within a reasonable range. Too large or too small will have an adverse effect on printing. If the thixotropy is too large, the consistency of the ink will be greatly changed, resulting in an inability to supply ink smoothly and smoothly. In severe cases, the ink supply may be interrupted, causing ink blocking and paste failure; if the thixotropy is too small, the fluidity It will also become smaller, which is not conducive to uniform ink transfer and ink, resulting in a lighter and darker print.
pH value
The pH of the film gravure ink should generally be controlled at 8.5 to 9.5. It should be noted that the pH value of the ink changes with the change of the temperature and humidity of the surrounding environment, and when the pH value changes, the viscosity and the transferability will also change, resulting in chromatic aberration. Therefore, during the printing process, the pH value of the ink must be monitored and adjusted periodically. Once the pH value is found to change, it is adjusted by adding an appropriate amount of stabilizer.
Problems and solutions
Poor ink transferability
The poor ink transferability is caused by many factors. The surface tension of the film is large. The ink with water as the main solvent is difficult to wet and level on the surface. The surface speed of the ink is too fast and the pH is easy to occur. Variety. In addition, the angle and depth of the gravure cell will have a certain impact on the ink transferability. In this regard, ink suppliers need to continue to improve the performance of ink, gravure platesetters should also adjust the gravure plate making parameters with the application of film gravure ink, such as laser engraving and plate-making, and increase the number of screen lines.
Pinhole
Pinholes, also known as white spots, sometimes appear in full versions, sometimes appearing locally. If it occurs repeatedly at a fixed part, it is called a mechanical pinhole. Usually it is caused by dirt or aging defects in the printing plate or guide roller. If it happens by accident in a non-fixed part, it is called chemical pinhole. The quality problem of the film gravure ink itself is mainly due to the excessive addition of the defoaming agent. For pinhole failure, the former can be remedied by cleaning the plate or the guide roller (or replacing the plate or guide roller); the latter, for the flexible packaging enterprise, on the one hand, it is necessary to carefully screen the film gravure ink product, another In the printing process, an appropriate amount of neutralizing agent can also be added to eliminate it, but it should not be added excessively.
Registration is not ideal
For a long time, this problem has always plagued us, so we dare not take the application of film gravure ink. Because of the large ink tension, it is even more difficult to apply on non-absorbent, non-polar plastic flexible packaging. Ink suppliers have been researching for a long time to continuously improve the structure of ink to accommodate the registration of film gravure, but there is still no film gravure ink of the same quality as solvent ink overprinting.
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