As one of the key industries named in the Notice on Accelerating the solution of the outstanding problems in the management of volatile organic compounds, the pressure of the printing industry has doubled. Recently, Nanjing ecological environment pushed a "one key Get printing industry VOCs governance investigation guide", starting from the actual situation of Nanjing, looking at the entire industry ecology, and pointed out that enterprises should pay attention to many matters.
Guide mentioned, according to the air pollution emission inventory research, solvent is the second largest VOCs emission source in Nanjing, contributing rate of nearly 40%, and the printing process used ink, adhesive, coating liquid, fountain liquid, thinner and so on, will cause a large number of VOCs spillover, leading to the formation of VOCs pollution.
In fact, to explore the process of printing, we can also find, whether it is offset printing, letterpress printing, gravure printing or printing, emissions of VOCs link basically the same, focus on the use of all kinds of solvents, involving the volatilization in the process of mixing, printing ink, drying stage, composite process and equipment cleaning, etc.
After analysis, it is found that the VOCs components emitted by the printing industry are more complex, including toluene, ethyl acetate, methyl ethyl ketone, ethanol, etc., and cover the whole process of material storage, transportation to use. And generally speaking, all over the gas enterprise end management requirements are more than 80%. Management difficulty is big, index still tall, this chooses to put forward a requirement to each enterprise management craft.
The above guidelines highlight two main areas:
(1) source control, that is, whether the use of low volatile ink and other raw and auxiliary materials;
(2) Process control, VOCs have volatile characteristics, so in the solvent storage to the use of each link need to pay attention to airtight, sealed.
At present, in addition to the traditional printing process is equipped with the necessary VOCs collection and processing equipment, the concept of "green printing" is more respected. To put it simply, green printing is to use more environmentally friendly materials and processes to reduce the pollution generated in the printing process, and at the same time to realize resource and energy saving, waste recycling and natural degradation, so as to minimize the impact of printing operations on the ecology.
As early as 2010, the "Implementation of green Printing strategic Cooperation Agreement" was signed, China to promote the implementation of green printing has been officially launched. Subsequently, "Notice on the Implementation of green Printing", "Notice on the Implementation of green Printing in Primary and Secondary School Textbooks" have been issued, and gradually put green printing into practice.
In 2018, the National Printing Industry Green Development Promotion Association revealed that the national primary and secondary school textbooks have achieved full coverage of green printing for four consecutive years, and the qualified rate of environmental protection quality sampling inspection is 100%. Relevant person in charge said at the meeting that the scale of green printing market continues to expand, the scope of green printing has been expanded from compulsory education textbooks to high school and college textbooks and some teaching auxiliary materials, and the scope of green printing of children's books has expanded rapidly.
In short, starting from the source, the implementation of green printing, for the printing industry, is one of the most feasible measures to achieve VOCs emission reduction.
