From the point of view of printing process, there is no similarity between pad printing ink and screen printing ink. Screen printing ink shows the mechanical structure under the pressure of squeegee, and pad printing ink is more of the property of being transferred. The transferability of offset printing ink plus the plasticity of screen printing ink should be the ideal printing ink. In order to realize the permeability of screen printing ink, it is necessary to add a certain lubricant, but pad printing ink does not require such ingredients. In order to realize the deinking of pad printing ink, pad printing ink is added with a certain material such as release agent, but screen printing ink is not needed. The ink layer of the screen printing ink is thick and the handwriting is eye-catching. To achieve the same effect, the color density of the pad printing ink must be high.
Screen printing generally uses water-based inks in the field of fabric printing, but at present, it is still difficult to use water-based inks in the printing industry, which is another difference between them. There are two reasons for this defect of pad printing, one is that the water resistance of the steel plate is not good, and it is easily eroded by water-based ink. Of course, if we replace the resin version, this factor can be ruled out, but the transferability of the plastic head will be limited, and it is still difficult to transfer enough water-based ink to silicone rubber.
The maintenance of the shape of the pad printing ink on the pad printing head requires that the pad printing ink has a sufficiently good hysteresis. Otherwise, the print of the ink may become unclear. On the other hand, the cohesive force of the print formed on the surface of the rubber head is significantly greater than the surface tension of the silicone rubber, and has a release function, such as thermal transfer ink on the thermal transfer film. The complete transfer of pad printing ink to the product surface is the most important requirement for pad printing ink, but the complete transfer of ink is only an ideal situation. In general, ink can only transfer 86%. Although the original pad printing ink was replaced with screen printing ink, it cannot be said that pad printing ink is a screen printing ink. The theory of ink is suitable for all printing processes, but different printing processes have detailed requirements. It is precisely the above requirements for pad printing inks that have prompted many ink manufacturers to try to make specialized pad printing inks. Currently, only Marabu and Dujo in Germany have launched pad printing inks that are improved on the basis of screen printing inks. Made.
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