Solvent for флексопечати 3814009090
How solvents are used for flexo paints in printing?
Different types of chemical solvents are used for printing inks made on different bases - from nitrocellulose to alcohol. Thinner is a type of substance that helps to maintain the optimal level of their viscosity and improve the overall print quality.
Thinner for flexographic printing: composition and characteristics of the product
Let's take a closer look at what characteristics a quality solvent for flexographic printing has. Primarily, this is the absence of teratogenic effects on the human body as a result of prolonged interaction. Secondly, it is a neutral smell - it should not be harsh and very unpleasant. Thirdly, it is the fastest and most effective dissolution of nitrocellulose-based inks and counteraction to their swelling during printing on different types of materials.
What else is the difference between a high-quality solvent and a low-quality one? The fact that it has a neutral level of negative impact on different types of printing plates is important to prevent their damage during the printing process.
The solvent for printing ink itself is a mixture of components with different chemical properties, it is used to prepare paint for further use. Besides flexographic printing, solvents, a quality printing process? It is thanks to him that the ink receives the level of viscosity that allows it to pass freely through the printing system. If the degree of its viscosity is excessive or insufficient, then there is a high probability that the color saturation of the print will be insufficient, or after printing, dots will spread.
Solvents with this percentage are considered to be of higher quality, as 80% propyl alcohol and 20% propyl acetate. Such products are more expensive, but they provide higher quality than cheap counterparts based on ethyl ester of acetic acid and isopropanol. It is the first version of the solvent that has an improved dissolving power, as well as a less harsh aroma than solvents based on acetone and ethanol.
It is also worth paying attention to the density of the solvent itself - it can become less or more. If this happened, then in the solution, in addition to the main components, there is also water or foreign impurities. The level of water content in the product is especially important - it should not be more than 0.2%. If its concentration is exceeded, then due to the high humidity of the air, condensation appears on the printed layer. It is quite simple to fix this situation - it is worth adding such a hydrophilic component as ethoxypropanol to the solvent.
In addition to the water level in the solvent, it is also important to monitor the concentration of acetic acid in it. If its amount is excessive, it can subsequently lead to breakdowns and complete malfunction of the printing equipment.
Solvents in the printing industry and their influence on the properties of printing ink
With the help of ethyl ester of acetic acid or propyl ether, you can speed up the drying process of flexographic ink after printing. It is recommended to use these substances due to the fact that their chemical properties are as close as possible to ethanol, as well as to improve the quality of raster printing.
Before you buy a solvent and start actively using it, you should read with the degree of surface tension of different types of surfaces with printing inks. For example, for EA and alcohols, this figure is 24. For isopropyl ester of acetic acid and IPA, it is 21. These components provide:
easy paint release from cells;
maximum wetting of the entire surface;
elimination of gray hair on dies;
optimal level of dot spreading even on low-activated films.
As for propylene glycol monomethyl ether and ethyl ether, the surface tension for these substances is 28. They make it possible to obtain the finest possible color transitions in printing inks, as well as to improve the quality of printing bitmap illustrations.
Butanone and propylene glycol monoethyl ether are also used as retarders for alcohol-based printing inks, as well as adhesives and other types of paints and varnishes. It is important when using butanone to take into account its intense aroma, similar to that of acetone.