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1 Composition of water-based ink
Water-based ink is made of water-based resin, pigments, solvents and additives through compound processing and grinding.
The water solubility mainly plays the role of the binder, so that the pigment particles are evenly dispersed, so that the ink has a certain fluidity and the adhesive force that occurs, so that the ink forms a uniform film after printing.
Water-based ink
2 Features of water-based ink
1.
Water-based ink is a new type of environmentally friendly printing ink com" href="http://">coating online coatingol.
com with good adhesion, good flexibility, good elasticity, anti-sticking, washing resistance, very good printing and high solid content .
2.
Non-flammable, stable ink, non-corrosive printing substrate, prevent color migration, strong water resistance, dry and agile, reduce the risk of loss caused by static electricity and flammable solvents, and can also reduce the residual toxicity of the printing surface.
The equipment is very convenient , So it is especially used in food, beverage, medicine and other packaging industries.
3.
The water-based ink solvent is water and a small amount of alcohol, which significantly reduces VOC emissions and can prevent loud noises to human health.
Products that are in direct contact with the human body, such as T-shirts and other pure cotton, elastic fabrics, insoles
4.
In terms of cost, because the price of organic solvents continues to rise, the use of solvent-based inks is high, and the solvent and screen washing of water-based inks mainly use tap water, which will undoubtedly be cheaper than solvent-based inks.
Water-based ink
3Instructions for use of water-based ink
1.
General requirements for water-based inks
Applicable mesh: 40-100T (water-based screen printing plate)
Applicable squeegee: 65-70 degree polyester squeegee or water-based special squeegee is recommended
Coating area: 25-35 square meters/kg (77T polyester plain silk or light glue screen)
Thinner: neutral water (purified water)
Washing water: general tap water
2.
Distribution requirements for water-based inks
According to different printing requirements, the viscosity of the ink needs to be adjusted appropriately before use.
When adjusting, pay attention to sticking to the neutral and alkaline, otherwise it will affect the viscosity and drying speed of the water-based ink.
At the same time, the color paste cannot exceed 8%, otherwise the color fastness of the ink may be reduced.
3.
Printing requirements for water-based inks
Because of the characteristics of water-based ink, the drying speed of the ink is difficult to control, so when printing, the printing speed is too slow, which will easily cause the ink on the screen to dry quickly.
Dry requirements of water-based inks
Water-based inks are mainly natural and dry, but after printing, they are naturally dried for 8 hours and then baked at 130 degrees for 1 minute.
4.
Application of water-based ink additives
Defoamer: Used to eliminate vapor bubbles, the dosage is between 0.
5-2%.
Thickener: used to increase the viscosity of the resin to make the ink reach a suitable viscosity, the amount is 0.
5-2%
PH stabilizer: used to maintain the PH value of water-based ink, and control it between 8-9.
5.
5.
Matters needing attention before using water-based ink
1.
2.
3.
Because of the evaporation of water during the printing process, the viscosity will rise and the PH value will drop.
The pH stabilizer should be between 8-9.
5.
4.
Because of the complexity and diversity of current printing substrates, strict pre-production tests are required before selecting a certain ink for mass production.
5.
The ink will be gelatinous when stored for a long time, so it needs to be fully stirred during use.
6.
After the ink is dispensed, you need to stand still and defoam before use, otherwise bubbles or pinholes will occur in the ink layer.
7.
Static electricity on the screen or printed surface will cause pinholes in the printing ink layer.
8.
When printing is stopped for a short time, it should be covered with a layer of ink, otherwise it is easy to cause network blocking.
9.
Rinse with water immediately after printing, otherwise it is easy to block the net after being dry, and the thickness of the screen can be increased to reduce the oil blocking the net.
