Plastic packaging and printing is an integral part of the production of plastic bags, shopping bags generally account for 3% to 5% of the cost of production, and shopping bags is an important indicator of environmental protection. In plastic bag printing, the choice of ink should pay attention to the following aspects.
Most of the ink connection material for the polymer, its nature, but also a plastic. Like plastic bags, printing ink degradation is also relatively poor. It takes more than 50 years for the ink to degrade naturally if it is printed with plastic inks. Degradation of the current market faster ink, can be completely degraded in 5 to 10 years out of such inks are soybean oil ink, polyvinyl alcohol ink, polyketone ink.
Ink contains heavy metal content.
Heavy human intake of heavy metals, can cause serious physiological damage. The heavy metal into the body, it will form a cumulative, therefore, the choice of plastic packaging printing process selected ink, must consider the ink coating of soluble heavy metals restrictions. At present, there are three major standards on the market.
Other ink may be toxic and harmful substances, plastic bag printing should also be taken into account, these toxic and hazardous substances include:
The linker produces monomers that remain during synthesis, such as highly toxic free toluene diethylene monocyanate;
Polychlorinated biphenyls and aromatic amines remain in the pigment when they are synthesized, which are strong carcinogens.
Solvent residues in the printing process will lead to benzene, toluene, xylene, formaldehyde exceeded. China's dry wipes in the content of harmful substances have the corresponding requirements, the provisions of, for example, require formaldehyde content of not more than 0.1 percent.