1. Control of color sample and color card
For the paper card printing color sample provided by the customer, must be kept strictly. Color sample, color card is recommended to replace once every three months, in order to achieve permanent hue, lightness and saturation.
2. Paper card printing from ink control
In the actual paper card printing process, to control the ink viscosity and PH two characteristics.
3. Control from machine speed
In the actual paper card printing process, to maintain a stable machine speed to produce, do not be fast and slow, especially cots scraping ink supply ink system. This is because the two-roller ink transfer system is through two rollers each other extrusion rotation, with a certain linear speed difference to complete, the speed of the printing machine is also a direct impact on the printing color of an important factor.
4. Printing pressure control from paper card
Contact pressure of anilox roller and printing plate, printing plate and cardboard printing pressure. Therefore, printing pressure is also an important factor to be controlled in order to achieve the same color of the same batch of goods.
5. Make sure the anilox roller is clean
Paper card printing in addition to the above four points, paper card before printing to ensure that each printing unit anilox roll is clean. Because of the roller mesh hole if there is a blockage, will affect the uniformity of the ink, the printed text will appear uneven color.
6. Paper color
Different whiteness of paper has different effects on the color of printing ink layer. Because whiteness is different in the ink to add different black, red, blue or yellow, so in the paper card printing, although the amount of ink, color has no change, but the actual ink has a certain transparency, the effect of color with the paper whiteness is different and appear, resulting in different color difference.
