Main classification and characteristics of eco-friendly ink
What types of eco-friendly inks can be divided into? What are the characteristics of environmentally friendly inks? Let's take a look at the classification and characteristics of environmentally friendly inks together.
Ordinary solvent inks usually contain aromatic hydrocarbon solvents (toluene, xylene). Some international ink companies first introduced non-aromatic hydrocarbon solvent inks in the Chinese market, using alcohols, esters, ethers, ketones, and gasoline as solvents, eliminating the possible harm caused by aromatic hydrocarbon solvents. Solvent-based inks used for flexographic printing are basically aromatic-free, but there are still many volatile organic solvents, which will mainly affect the air quality of the printing shop. Residual odor is rare in printed matter, and there may be a small amount of odor in composite printed matter, but it is basically impossible to find in surface printed matter.
Water-based inks Compared with solvent-based inks, water-based inks have a further environmental performance. Not only does it not contain aromatic hydrocarbon solvents, but VOC is also greatly reduced, but it still cannot achieve zero content, and still contains a small amount of alcohol, ether, and even organic amines. It has less impact on the environment, mainly polluting the workshop air.
UV offset printing inks do not contain volatile organic compounds, which is a big step from this point, and it is safer than water-based inks. But its drying is achieved by ultraviolet rays. Ultraviolet rays may induce skin cancer, which can change oxygen into ozone, so the drying device of the printing press should be installed with exhaust equipment to discharge ozone outdoors. Water-based UV inks, like water-based inks, have a small amount of volatile organic solvents. Compared with ordinary UV offset printing inks, their environmental performance is worse. In fact, the definition of environmentally friendly inks is only relative, but for the most widely used offset printing inks, the contribution of environmentally friendly inks to environmental protection has not stopped.
1. Water-based ink: The biggest difference between water-based inks and solvent-based inks is that the solvent used is water instead of organic solvents, which significantly reduces VOC emissions, can prevent atmospheric pollution, does not affect human health, is not easy to burn, and has stable ink properties. Bright color, non-corrosive plate, simple operation, cheap price, good adhesion after printing, strong water resistance, fast drying, so it is especially suitable for food, beverage, medicine and other packaging prints. It is a globally recognized environmentally friendly printing material. Currently the only ink approved by the American Food and Drug Association among all printing inks.
2. Water-based inks: Water-based inks are a new direction in the field of ink research. The viscosity of prepolymers in ordinary inks is generally very large, and it needs to be diluted by adding reactive diluent. The currently used diluent acrylate compounds have different degrees of skin irritation and toxicity. Therefore, while developing low-viscosity prepolymers and low-toxicity active diluents, another development direction is to study water-based inks, that is, water and Ethanol and the like serve as a diluent. At present, water-based inks have been successfully developed and used in some printing. In addition, alcohol-soluble ink, which mainly plays a role in flexo printing, is also a kind of ink with little pollution. It is mainly used in food, medicine, beverages, tobacco and alcohol, and packaging printing of daily necessities that come into contact with the human body.
The above is the introduction of the main classification and characteristics of eco-friendly inks. I hope everyone will understand the main classification and characteristics of eco-friendly inks, and it will be helpful to everyone.