Adhesion of ink is an important consideration in screen printing mesh.
The main factors affecting adhesion are the following
First point solubility parameter SP
The solubility parameter SP is an important physical property value considering the adhesion of the ink or paint to the plastic. The closer the solubility parameter SP of the resin and the solvent in the ink and the solubility parameter SP of the plastic are, the better the adhesion is.
The second point of cleaning the surface of the plastic part is very important
The presence of dust, grease, and dirt makes it difficult for the ink to wet the surface thereof, and it is less likely to cause dissolution, and the roughening effect is poor, so the adhesion is lowered.
Third point
The crystallinity of plastic also affects adhesion
For materials with high crystallinity such as polyethylene and polypropylene, the solubility parameter SP is small and the polarity is small. Therefore, the adhesion of the ink on the ink is generally poor, and the surface is usually roughened. For example, when flame treatment is used, when the temperature is increased to the degree of melting, the surface thereof is transformed into a large crystalline state, which greatly improves the adhesion effect. At present, special inks for directly printing plastics such as polypropylene and polyethylene without surface treatment have been developed at home and abroad.
The factors affecting the adhesion of the ink are described above. If you need a screen printing mesh, please contact our professional maishi wire mesh manufacturer.
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