Before printing soft packaging, first find out the types and methods of using water-based ink additives!
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The commonly used additives in water-based inks are: pH stabilizers, defoamers, slow-drying agents, quick-drying agents, and the like. What are the functions, when are they added, and what is the usage?
1, PH stabilizer. The pH stabilizer can supplement the ammonia and water volatilized from the ink transfer system during the printing process, which helps the viscosity of the ink to be stable and ensures the printing quality. Depending on the substrate, pH stabilizers are divided into normal and thin film types. When printing fine mesh wires, use a dedicated pH stabilizer. The general pH stabilizer is used to add 1% to 2% of the total ink amount every 30-40 minutes to stir evenly, or to add a stabilizer to the circulating ink pump.
2, defoamer. Generally, an appropriate amount of antifoaming agent is added to the ink before starting the printing to prevent the ink from foaming, and an appropriate amount of defoaming agent may be added if necessary during the printing process. The amount of the antifoaming agent does not exceed 0.5% to 1% of the total amount of ink at a time.
3, fast drying, slow drying agent. The quick-drying and slow-drying agent can be added to the ink according to the actual printing speed of the printing machine, and the drying speed of the water-based ink can be appropriately changed to obtain a satisfactory printing effect. The amount is from 1% to 2% of the total amount of ink.
4, withdrawal of agents. Under the premise of constant pH and viscosity, the addition of the defatting agent can reduce the color concentration of an ink. The amount should be determined on a case-by-case basis.
5, thinner. The addition of a diluent to the ink reduces the viscosity of the thickened water-based ink without affecting the pH. The amount must never exceed 5% of the total ink.
6, enhancer. The reinforcing agent can enhance the adhesion of the printing ink or the varnish to the printing material, and the amount is generally from 1% to 2% of the total amount of ink.
7, remove static agents. The antistatic agent can effectively prevent the accumulation of static electricity on the printing machine, and the amount thereof is generally 0.5% to 1% of the total ink amount.