1. In the nets printing, attention should be paid to control the water-soluble ink parameters, including ink viscosity, liquidity, thixotropy and plasticity, etc.
2. Note the water-soluble ink control index. The water-soluble ink control indicators are mainly fineness and viscosity, pH value and the drying speed, etc, they to the ink and application effect of the decisive role.
3. Because of water-based ink to pure water system, so pay attention not to use of the water-based ink and alcohol sex ink and solvent ink used in ink or mixed in organic solvent, lest appear printing quality problems.
4. Use water-based ink, should its stir well, measuring viscosity suitable ink slot into, if not suitable viscosity, can use thinner or thickening agent on the adjustment, and pay attention to control ink pH value, general master in 8.5 ~ 9.5. The printing process, because the volatilization of water, wash viscosity increases, pH value falls, so always observe the ink use situation, found that the ink viscosity rise or pH beyond control range, should be adopted timely thinner and pH stabilizers on the adjustment, in order to ensure that the viscosity and pH value stability.
5. Usually, very suitable for high speed printing ink printing, low speed if meet the drying speed too fast or printing the effect not beautiful, can add a certain proportion of slow dry agent.
6. After the printing ink painting should be the remaining original barrel or take corresponding will ink tank cover tightly with the lid of the stores of time, used again. Because the surface to prevent ink conjunctiva, thickened and even become dry. Should be stored in a cool and water-based ink ventilation of indoor, room temperature control in 5 ~ 45 ℃.
7. After printing residue in the ink printing equipment in its not completely dry available, can't rinse rinse of the ink can be used for cleaning cleaning agents.
8. The ink printing eligibility by printing conditions, their surfaces properties, environmental temperature and humidity, the storage time length etc. The influence of the objective conditions, so when use, need to use some additives on ink painting do fine adjustment to get the best printing effect. Water-based ink of auxiliaries used in nonferrous materials, pH value stabilizers, slow dry agent, defoaming agent, dilute agent, printing auxiliaries to be familiar with the characteristics and method of use.
1) color material used to deepen its dosage should be color, general control in 0 ~ 30%, more than 30% will be making the ink connect material content is too low, lead to the adhesion and abrasion resistance down.
2) pH value stabilizers is used to regulate and control the water-soluble ink pH value, make its stability in 8.0 ~ 9.5, ensure water-based ink printing state. At the same time, it also can adjust the water-soluble ink viscosity, and the ink to dilute.
3) slow dry agent used to reduce the dry degree of ink, slow dry agent can inhibit water-based ink and slow the drying speed, prevent ink printing plate in the dry, reduce the blocking version and paste version and printing of failure. Slow dry the dosage of the general agent should be controlled in total amount of 0 ~ 10% ink, if addition amount, not too much ink dry thoroughly, prints will stick dirty or produce peculiar smell.
4) dilute agent used to reduce main depth of color, the dosage is not limited. But to join a lot dilute agent could lead to ink painting viscosity risen slightly, then can also add a little thinner adjusted.
5) to dilute the main used to reduce the dosage of viscosity, ink painting should be controlled in 3% less than, just not reduce the ink color depth, and keep the ink painting pH value remains the same. Thinner should be stirring slowly add edge in low viscosity. If join more thinner or use high hardness of tap water dilute will have bubbles, then should join defoaming agent.
6) use water-based ink appear in foam problem is the main cause of the water as a thinner in emulsion polymerization, when he must use a certain number of emulsifier, make the emulsion system surface tension dramatically reduced. Defoaming agent's role is to suppress and eliminate the generation of bubbles, and avoid have bubbles and appear pinhole, leakage white, nonuniformity ink printing quality problem, but generally defoaming agent to control the amount of between 0.1% and 0.2%.
7) thickener mainly used to increase the viscosity, ink and can give ink excellent mechanical and physical and chemical stability in printing, can control the role of rheological properties, but not too much, if the amount of water-based ink using too many thickener, can make the bubble film wall thickening and increase the elasticity, make the bubble is not easy to eliminate, general control in 0.5% ~ 1% for good.
8) fast drying agent mainly used to speed up the drying speed, the dosage ink painting is 0 ~ 30%.
9) the subsidence agent can make the ink pigment particles suspended even and not easy to rally settlement, avoid to produce float color phenomenon.
The trend of the development of future water-based ink
Because has the water-based ink good environmental protection characteristics, at present developed countries and regions are working to develop and use water-based ink to gradually replace ink solvent. With water-based ink printing as the main development object of packaging and printing international had formed a kind of trend. From the international packaging printing, the development trend of water-based ink has set up a file from a single box to all kinds of base material, more ink printing development f.
In the United States and some European countries have banned the use of ink solvent contain benzene, instead of green environmental printing ink. Now, the plastic printing in 40% of the water-base printing ink. Other developed countries, such as Japan, Germany, France, etc, in plastic film printing also more and more use water-based ink, Britain has legislation to ban the use of food packaging printing ink solvent with film. In recent years, our country for food packaging also made some regulation, water-based ink printing position in China is constantly improving.