Now printing enterprises and individual units are paying more and more attention to the problems of environmental protection printing and environmental protection ink. But many people do not know, so what is the environmental protection ink? What makes it an environmentally friendly ink? With the continuous introduction of water-based inks, UV inks, bean-based inks and other environmentally friendly inks, environmentally friendly inks are gradually coming into people's attention. Identifying whether a product is environmentally friendly ink is not defined by a single standard. There are many aspects to consider, from the ink formula, ingredient content and other standards to measure an ink.
The focus of eco-friendly inks
So depending on whether an ink is environmentally friendly ink, generally consider the following points
1. Heavy metal content
This concept was first proposed by Germany. Because children often put toys printed with ink into their mouths, there is a possibility of inadvertently absorbing heavy metals, so people began to demand the heavy metal content of ink. Heavy metals are mainly derived from pigments and additives in inks. Although most of the inks have reduced the content of heavy metals, there are still people who use chrome yellow and chrome red to make inks.
2. Aromatic hydrocarbon solvent
Mainly refers to toluene, xylene, polycyclic aromatic hydrocarbons and their derivatives. They will evaporate into the air with the drying of the ink, which not only pollutes the air, but also poses a threat to the health of printing workers.
3. Volatile Organic Compounds (VOC)
There are many kinds of it, such as alcohol, ester, ether, ketone, mineral oil and so on. Like the aromatic hydrocarbon solvent, it will evaporate as the ink dries, thereby polluting the air.
China's environmental protection ink development history
The environmentally friendly inks launched in the Chinese market can be divided into the following categories in chronological order.
Ordinary solvent inks generally 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 harm that aromatic hydrocarbon solvents may cause.
The solvent inks currently used for flexographic printing are basically free of aromatic hydrocarbons, but there are still many volatile organic solvents, which mainly affect the air quality of the printing workshop. Residual odors are already very few in prints. There may be a small amount of odor in composite prints, but they are basically not found in surface prints.
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 little impact on the environment, mainly polluting the air in the workshop.
UV offset printing inks do not contain volatile organic compounds, which is a big step from this point of view. It is safer than water-based inks. But its drying is achieved by ultraviolet light. Ultraviolet rays may induce skin cancer and make oxygen into ozone, so the drying device of the printing machine should be installed with exhaust equipment to exhaust ozone outside. Water-based UV inks, like water-based inks, have a small amount of volatile organic solvents. Compared with ordinary UV offset inks, their environmental performance is worse.