In the process of soft printed, we need to get a stable plate surface tension.Only plate surface tension stable, we may set up with ink surface tension with a solid platform.Plate making process, then, how to guarantee the stability of surface tension for flexo process of plate?In fact, in the flexographic plate making process, stable plate surface tension should be a way.
A operation, flexible suppliers comply with requirements
Strictly according to the flexible version of the suppliers of environmental protection, such as solvent distillation, determination, compensation procedures go, don't take it for granted to copy path, approached the road, instead of days that went wrong.The problem is that on the premise of protecting business interests, how to use the solvent.Suppliers to do some cloud mountain fog cover, but to do this, first is the only option.Need to strengthen the monitoring of plate surface tension after made, simple and practical way is to use corona pen test, and supplemented by high power magnifying glass test plate sag in finish.
Second, wash version of solvent solubility and stability
Tetrachloroethylene - n-butyl alcohol solvent washing edition in traditional solubility stability is unique, but the toxic tetrachloroethylene is too big, from "flexo is recognized environmental protection printing way" the standards, wash with tetrachloroethylene version is, indeed, should not be.But in addition to the solvent cost this factor, whether there is any version using this method to wash, plate making quality stability is the reason why higher?It's like gravure industry always feel toluene class than without benzene ketone ink ink printing eligibility better.Should we got from this method is a mixed solvent must be determined with the thinking of directional complement, slam the door is not environmental protection of the solvent.
Three, wash with water soluble solution
Water-soluble liquid washing version contains organic solvent, the boiling point is very high, is not easy to volatilize, and since you are mixed with large latent heat of evaporation of water, solvent comprehensive balance problem is masked, contradiction is not prominent.But water-soluble liquid washing version is, after all, will not curing resin dissolved in it, so with the increase of solid, the concentration will decline, and solubility decline will depend more on the brush effect, by raising the plate surface tension, the plate surface tension will be fluctuations, is must pay attention to this point.After washing version made contact with ethanol was said to be safe, plate no swelling, but were found in practice after swelling, supplier need not ethanol is recommended, using isopropyl alcohol and 1:1 the mixed solvent of methanol.The case shows that we have in-depth study of washing version of necessary, and water-based additives toxicity index is not optimistic.
Fourth, thermosensitive plate-making technology
To really get rid of with wash version fluids (including organic solvent and water-based solvent) wash version of the surface tension of plate making process is thermal plate-making technology.Is characteristic of the plate making process by heating curing photosensitive resin from solid to liquid, then using pressure roller pressure on its surface, similar to like gravure printing unit through the impression cylinder plate mesh point of ink sucked out, wrapped in a pressurized cylinder non-woven will liquid resin suck out already on the plate, complete separation of curing with curing photosensitive resin.Thermal version of surface tension is fully embody the characteristics of solid itself, to avoid the version for washing solution for the dissolution of solid materials such as stripping process, the impact of avoiding the surface tension fluctuation in the process of the plate making.
Thermal version are stand critical in environmental protection, but the thermal version of the operating data provided by suppliers now, the production of printing fine degree is much worse.At the same time, the pressure is also a problem, too much stress can make the network edge collapse, affect the network precision.In addition, the surface properties of nonwoven is not simply just the problem of long fiber staple, we pay more attention to its adsorption ability of liquid resin.In general, the thermosensitive plate-making technology further refine and improve, while can get fine plate, and can guarantee the stability of plate surface tension, this is what we need.
When plate-making process can provide flexo process with surface tension stable plate, the next question is the ink.Our goal is to cooperate with plate surface tension effectively of ink, solvent ink, water-based ink, or UV ink.This bar, should and can make the hands of the printing ink industry.
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