Membrane Switch Screen special printing is a new screen-printing technology derived from the usual screen-printing technology. Although it originates from screen printing, it uses special screen-printing printing method to push screen printing technology. In a new field, for example in the usual screen printing, the requirement to ensure print quality is to reproduce the image on the substrate as accurately as possible.
Here, " reproducibility " means that the printed image is consistent with the original image. Sexuality, the color of the printed image and the color of the original, but in the special functional screen-printing products such as the Membrane Switch , not only the reproducibility problem mentioned above, but also the screen printing on the substrate Based on these considerations, the thickness, compactness, smoothness and electrical parameters of the "PET" conductor paste need to be mastered during the printing process. For example, when applying ink, the relative pressure is relatively light, and back. When the ink is applied, the pressure is relatively heavy (i.e., it is lightly pressed back).
It is softer in the choice of blade hardness. There is also the handling of the substrate before printing, because PET surface polarity is poor, the affinity for most inks ( including silver paste ) is low, although the silver paste manufacturer has chosen the appropriate solvent for this problem, trying to The surface of the untreated PET film was successfully printed, but due to the precipitation of certain auxiliaries, esters in the P ET film, and the adhesion of oil during the operation, the adhesion of the silver paste was lowered. The PET film should be subjected to an activation treatment before the printed circuit to increase the surface polarity of the PET film.
In addition, the PET film is thermally stabilized and the like. From the above, a series of processing methods in the screen-printing process of the membrane switch, we can clearly see that the special processing means different from the general screen-printing technology in the special printing of the screen printing. Of course, in the printing process of the membrane switch, it is also necessary to pay attention to the choice of the metal content of the silver paste, that is, the quality of the silver paste. Even if we choose the right screen preparation technology, the correct screen-Prin tinging technology and material processing technology, if the quality of the silver paste used is inferior, then the final Membrane switch produced must be an unusable waste.
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