First, the printability of printing materials on the impact of the amount of ink transfer printing effect is achieved through the reasonable adhesion of the ink on the substrate, so the physical and chemical state of the surface of the substrate directly affect the amount of ink transferred on it.
Second, to improve the printability of plastic film 1. The need to improve the printability of plastic film surface The physics theory shows that in the substrate to obtain good printability, the surface tension of the substrate should be higher than the surface tension of the ink. This is the theoretical basis for the pretreatment and processing of various types of substrates before printing.
PP, PE film non-polar polymer materials, chemical properties, stability, surface tension, combined with synthetic resin added opening agent, antistatic agent, anti-aging agent, etc., difficult to bond with the ink.
2. Processing plastic film printability method (1) Plasma treatment The plasma is an ionized gas. It consists of three components: electron, ion and neutral particle. The total charge of electron and ion is basically the same, so the whole is electrically neutral. The electrons or ions in the ionized plasma are driven onto the surface of the substrate by the discharge device. On the one hand, long molecular chains of the material can be opened and high energy groups appear; on the other hand, fine pinholes appear on the surface of the film after striking. At the same time, it can also dissociate and re-dissolve surface impurities. The ozone released when ionized has a strong oxidizing property, and the attached impurities are oxidized to be removed, so that the free surface energy of the substrate is increased, and the purpose of improving the printing performance is achieved.
The structure of the plasma treatment device is shown in the figure below. One end of the electrode is 20,000 volt high voltage resistant wire with limited pressure. At the other end, a rubber-coated steel roller was used, and the length of the discharge electrode was 347 mm.
Second, to improve the printability of plastic film 1. The need to improve the printability of plastic film surface The physics theory shows that in the substrate to obtain good printability, the surface tension of the substrate should be higher than the surface tension of the ink. This is the theoretical basis for the pretreatment and processing of various types of substrates before printing.
PP, PE film non-polar polymer materials, chemical properties, stability, surface tension, combined with synthetic resin added opening agent, antistatic agent, anti-aging agent, etc., difficult to bond with the ink.
2. Processing plastic film printability method (1) Plasma treatment The plasma is an ionized gas. It consists of three components: electron, ion and neutral particle. The total charge of electron and ion is basically the same, so the whole is electrically neutral. The electrons or ions in the ionized plasma are driven onto the surface of the substrate by the discharge device. On the one hand, long molecular chains of the material can be opened and high energy groups appear; on the other hand, fine pinholes appear on the surface of the film after striking. At the same time, it can also dissociate and re-dissolve surface impurities. The ozone released when ionized has a strong oxidizing property, and the attached impurities are oxidized to be removed, so that the free surface energy of the substrate is increased, and the purpose of improving the printing performance is achieved.
The structure of the plasma treatment device is shown in the figure below. One end of the electrode is 20,000 volt high voltage resistant wire with limited pressure. At the other end, a rubber-coated steel roller was used, and the length of the discharge electrode was 347 mm.
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