How much does the ink print hazard?
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With the rapid development of the printing industry, the harm of ink to human health is becoming more and more obvious. Looking at newspapers with low-quality prints, using bags that are easy to fade, wrapping things with scrapped newspapers, and eating while reading newspapers, these small things that often happen around them can make people a victim of ink pollution.
Contaminants in printed matter
Organic solvents such as ethanol, isopropanol, butanol, propanol, methyl ethyl ketone, ethyl acetate, butyl acetate, toluene, and xylene are often used in printing inks. Although most of these organic solvents will be eliminated after drying, the residual part will still cause harm to the human body. In particular, printed matter with a large inking area and a thick ink layer has a large residual solvent, and the toxic substances released during use pollute the air and endanger people's health.
A major problem with ink contamination is the pigment. These pigment particles are very small and have a strong adsorption capacity. They contain heavy metals such as lead, chromium, cadmium and mercury, all of which have certain toxicity. Taking lead as an example, a one-page color newspaper contains about 2000 micrograms of lead. Lead is the only trace element that is not needed in the human body. It is stable in nature, non-degradable, and hinders the formation of blood cells. When the lead in the human body accumulates to a certain extent, symptoms of chronic poisoning such as mental disorders, nightmares, insomnia, and headache may occur, such as severe fatigue, loss of appetite, nausea, abdominal distension, abdominal pain, and diarrhea. Lead can also enter the brain through the blood, causing brain damage. According to research, children's absorption of lead is several times higher than that of adults. Lead poison has a great influence on children's intelligence.
In addition, a large amount of benzene-containing diluent is used during printing, which is toxic and has a pungent odor. It is easy to pollute the air during use, and long-term inhalation may affect the central nervous system of the brain, causing great harm to human health.
How to prevent ink pollution
To prevent ink pollution, you must first take care of yourself. Usually pay attention to the following matters: When selecting books and newspapers, it is best not to buy poor quality printing and pungent ink, especially some pirated books use inferior ink. Harmful substances are inhaled into the body, which is very unhealthy for health; keep a good posture when reading a book or reading a newspaper, and keep your face from being too close to the newspaper; in addition, do not eat while reading the newspaper, so it is easy to pollute the ink. Eat in; wash your hands immediately after reading the newspaper, so as not to contaminate food and other items with the ink on your hands; do not use newspapers to wrap items, especially food, and do not use newspaper pads to put food, some text and patterns on plastic bags It is easy to fade, often stuck on hands or other items. This bag should be discarded immediately. Do not use it repeatedly. It is important to note that many children often carry bagged snacks in their hands and are easily exposed to lead in ink. The harm should be minimized by parents.
Using environmentally friendly inks is fundamental
However, to prevent ink contamination at the source, management of the printing industry should also be strengthened. In order to fundamentally improve the impact on the environment, we should start by changing the composition of the ink, that is, to use environmentally friendly materials to formulate new environmentally friendly inks.
Researchers in various countries are stepping up development in this area. At present, there are three main types of environmentally friendly inks, namely water-based inks, UV inks and water-based UV inks. The biggest difference between water-based inks and solvent-based inks is that the solvent used in aqueous inks is water rather than organic solvents, which has no pollution to the environment and has no adverse effects on human health.
According to relevant information, solvent-based inks containing benzene have been banned in the United States and some European countries, and green inks have been replaced. Currently, 40% of plastic printing in the United States uses water-based inks.
Other developed countries, such as Japan, Germany, France, etc., are increasingly using water-based inks in plastic film printing. The United Kingdom also enacted legislation in June 2003 to prohibit the printing of films for packaging foods with solvent-based inks.