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The concentration of solvent in water ranges from 40 to 80%. Higher boiling solvents have the advantage of a lower process pressure. This is weighed against the more difficult solvent recovery by distillation. [2] Ethanol has been suggested as the preferred solvent due to cost and easy recovery.
Solvent inks are divided into two sub-categories: hard solvent ink offers the greatest durability without specialized over-coatings but requires specialized ventilation of the printing area to avoid exposure to hazardous fumes, while mild or "eco" solvent inks, while still not as safe as aqueous inks, are intended for use in enclosed spaces ...
The mother liquor (or spent liquor) is the solution remaining after a component has been removed by a process such as filtration or more commonly crystallization.It is encountered in chemical processes including sugar refining.
Trichloroethylene is an active ingredient (solvent) in various printing ink, varnish and industrial paint formulations. [ 22 ] [ 17 ] Other uses include dyeing and finishing operations, adhesive formulations, rubber processing, adhesives, lacquers , and paint strippers .
As the paper to be printed moves through the printer, the solvent is spread across each sheet by an absorbent wick. When the solvent-impregnated paper comes into contact with the back side of the first sheet, it dissolves just enough of the pigmented wax to print the image onto the paper as it goes under the printing drum.
A major problem with soy ink is that it takes more time to dry than petroleum-based inks, due to its lack of evaporative solvents in the form of VOCs. [4] This creates challenges for some printing presses, especially those that use coated papers (such as magazines) instead of porous, uncoated paper (such as newspapers) where the ink can dry via absorption or IR in-line heaters.
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