About The use of auxiliary of printing ink of ability in swimming
The commonly used auxiliary in printing ink of ability in swimming basically has PH to be worth stabilizing agent, anti-foaming agent, wash-and-wear agent and slow dry agent to wait.
One, PH is worth stabilizing agent: PH value stabilizing agent basically is to be used adjust value of PH of water Chinese ink.
The PH of water Chinese ink is worth a problem, through manufacturer of each printing ink to presswork product of Chinese ink of company promotion water is mentioned constantly, PH cost is low cause printing ink easily to agglomerate, its viscosity is relatively inferior if PH cost is high. Pressworking commonly should detect in the process PH of water Chinese ink is worth change, be worth when PH under 8 when, should join right amount PH to be worth stabilizing agent, make water Chinese ink keeps good thereby presswork condition. The PH value of Chinese ink of European nation water is it is a standard with neuter, PH value is adjusted in 8.5 when, its fluidity, glossiness achieves groove, but pressworking in the process (inside 1 hour) the volatilization as a result of amine dissolvent, viscosity of water Chinese ink will be rapid heighten, glossiness drops, fluidity becomes poor, down to can appear many rejected product, if adjust PH value, need to join amine dissolvent, and pressworking in the process (inside 1 hour) should undertake detecting ceaselessly (use acidity plan) , have a bit inadvertent, reject can appear, and whole workshop was full of bad taste, such product is regarded as in printability undesirable, like the PH of water Chinese ink the value is in 7 ～ 8 between, the stability of water Chinese ink is best, the user can join clean water to make solvent reduce viscosity, won't raise cost so, still can make the colophony flavour of water Chinese ink is reduced.
2, anti-foaming agent:
Exorbitant, PH is worth viscosity of water Chinese ink on the low side, presswork speed is mixed more quickly presswork technical personnel adds water overmuch, generate bubble easily. Presswork can appear to show when bleb is bigger white, on Chinese ink quantity is little wait for a phenomenon, serious effect pressworks quality. General proposal adds curb bubble agent and exterior anti-foaming agent in water Chinese ink two kinds mix use, bubble in order to solve water Chinese ink phenomenon, its use scale to be 1 ～ 2% .
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