The effect of the fading agent on color
The lightening agent is a colorless transparent substance in the form of a paste, which plays a role in coloring in the spot color printing. The amount of the fading agent added is different, and the effect on the hue is also different, especially the blue color is the most obvious.
In the process of preparing the spot color ink, the ink and the ink spreader produce less shear force and pressure on the ink than on the printing machine. It is not necessary to add a light-removing agent during printing, but only when a color-cutting ink is dispensed with a light-removing agent can a uniform spot color ink color display card be produced. In the case of the same color density, the color of the color card and the printed matter is chromatic aberration. This is because the addition of the etchant changes the distribution state of the pigment in the ink, so that the absorption, refraction and reflection of the ink occur. The change, and thus the chromatic aberration, which is caused by the difference in the system.
Effect of difference in dry recoil density
Just printed out, the ink is still in a wet state, and there is a density difference with the dry state. The phenomenon that the wet color density is greater than the dry color density is called the dry density phenomenon. This is because the ink layer just printed has a certain leveling property, so the surface reflection is mainly specular reflection, which looks bright and lustrous. When the ink layer is in a dry state, the surface reflection is mainly diffuse reflection, and the color is naturally duller than when it is just printed.
Since the dry color density is generally measured after drying for 30 to 60 minutes, this makes it difficult to measure and control the spot color density.
The densitometer with the polarizer device can eliminate the light generated by the specular reflection on the surface of the ink layer, and the measured wet density is very close to the dry density, so that the measured density value is not affected by the wet and dry of the ink layer. For coated paper, the difference in measured density is 0.05 to 0.15, and the difference in measured density of non-coated paper is 0.1 to 0.2. The color difference is different for different colors, the yellow difference is the smallest, the black is the largest, and the blue and red are somewhere in between. Therefore, when measured with such a densitometer, the measured value should be appropriately higher than the density value of the standard color sample in order to play a controlling role.
Impact of system differences
The process of making a color card with a homogenizer and a stretcher is a "dry printing" process. There is no water involved, and printing is a "wet printing" process. There is a wetting fluid involved in the printing process, so the ink must be generated in the offset printing. The emulsification phenomenon of water inclusion, the emulsified ink changes the distribution state of the pigment particles in the ink layer, and the color difference is inevitably produced, and the printed product appears to be dark and not bright.
In addition, the stability of the ink used to match the spot color, the thickness of the ink layer, the accuracy of the weighing ink, the old and new differences in the ink supply area of ​​the printing press, the speed of the printing machine, the amount of water in the printing, etc., will also have different chromatic aberrations. Impact.
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