What factors affect the adhesion of glass screen printing ink?
1. Bottle material
If the printing material is impure, it will have a considerable impact on the adhesion. In the current market, the printing material impure is mainly manifested in synthetic materials and nozzle materials. Moreover, due to the differences in the processes of different companies during injection molding, the surface of the plastic material exhibits different conditions. There are many materials with grease on the surface, which will affect its adhesion. The color of the bottle material also has an impact on UV light reception, which can also affect its adhesion.
Second, the pre-press processing of the bottle
In order to obtain good adhesion of the ink to the substrate, the bottle must be polarized so that the surface tension of the bottle is at least 3.8 × 10-2N / m (generally speaking, the ink has good adhesion to the substrate) The most basic condition for focusing is that the surface tension of the substrate reaches at least 50dyn / cm).
The method of polarizing the bottle is mainly flame treatment. The principle of flame treatment is to decontaminate the plastic surface by high temperature and melt the surface of the film layer, thereby improving the surface energy of the plastic bottle and improving the adhesion performance of the surface to the ink. All in all, before printing, we must ensure that the surface of the substrate is clean and effective polarization treatment, the bottle surface treatment is not thorough, and the adhesion will inevitably have an impact.
3. Flame treatment
The flame processing machine is composed of several parts such as conveyor belt, conical plug column, flame nozzle and gas tank. During use, the plastic bottle is placed on the tapered plug column, and the conveyor belt moves forward at a constant speed. Before reaching the flame nozzle, the tapered plug column starts to rotate, and at the same time drives the bottle to rotate. Improve the surface energy of plastic bottles and increase the binding force with ink. The intensity of the flame, the running speed of the conveyor belt, and the smoothness of the bottle during rotation all directly affect the treatment effect, and the smoothness of the bottle during rotation is the most critical. The smoothness is proportional to the size of the bottle. The shorter the bottle, the smaller the radius and the better the effect after treatment. For larger bottles, we must take measures to increase its stability. The common method is to attach a nylon sleeve to the tapered post. The inner diameter of the sleeve is also tapered, and the outer diameter is consistent with the size of the bottle mouth. The added bottles cannot be dropped by themselves, and must be pulled manually. Flame-treated plastic bottles should be printed immediately, otherwise the surface of the plastic bottle can be lowered, and it is easy to be dusted again, which affects the adhesion of the ink.
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