In the upstream and downstream of the printing industry chain, papermaking, ink and other fields have become key emission reduction enterprises. How to reduce emissions is a severe test for nearly 200 printing and packaging enterprises in Yangzhou ecological science and technology new town. In recent years, the new city has vigorously implemented the "two mountains theory", adhered to the source control and comprehensive treatment, formulated the work plan for special treatment of volatile organic compounds, accelerated the source substitution of packaging and printing enterprises, promoted the promotion and substitution of clean and environmentally friendly raw and auxiliary materials of volatile organic compounds in the printing industry throughout the region, effectively reduced VOCs (volatile organic compounds) emissions, and built a green and low-carbon recycling system, Walk out of a "green printing" road.
VOCs: should be replaced, should be replaced
VOCs (volatile organic compounds) are the main precursors of ozone among the raw and auxiliary materials such as ink, dampening liquid, cleaning agent and varnish used in the printing industry chain. To promote the deep treatment of VOCs and reduce ozone pollution, source substitution is the most thorough and effective means.
"As for VOCs raw and auxiliary materials, we strive to make sure that they can be replaced and should be replaced." Said Guo Chenggen, chairman of Yangzhou Longteng color printing and packaging Co., Ltd. At the same time, he is also the vice president of Yangzhou Printing Association. For two years, he has been committed to the source replacement of paper printing industry and has promoted good experience and practices to printing enterprises in Hangji town.
The use of vegetable oil offset printing ink instead of mineral oil offset printing ink, the use of alcohol free dampening liquid instead of traditional dampening liquid + alcohol, and the use of environmental friendly new cleaning agent instead of traditional gasoline as cleaning agent... In Hangji Town, printing enterprises represented by Longteng color printing have taken action one after another to control the source and use all raw and auxiliary materials with low VOCs content to reduce harmful gas emissions.
Blister shell: from oil to water
In the workshop of Longteng color printing, there is a "five color + glazing" printing unit, a "six color" printing unit, and two "Heidelberg" printing machines imported from Germany. Pang Qili is shining with mechanical precision between the "printing + glazing" line processes. only a few staff are busy among the units.
"The waste gas generated by the raw and auxiliary materials used in the printing production process certainly has a certain impact and harm on people's health. While replacing the source, we have also carried out intelligent transformation and digital transformation of the enterprise. The imported equipment has been replaced, and the environmental protection, stability and printing quality have been greatly improved, as well as the labor efficiency and environmental quality." Guo Chenggen introduced.
As the world's largest industrial base of oral care products and toiletries, Hangji town has an annual output of 7.5 billion toothbrushes. One of every three toothbrushes in the world comes from Hangji, a new city. In this case, the printing industry of the new town has a close relationship with the daily chemical industry. Guo Chenggen picked up a printed toothbrush paper card. The color difference between the printed toothbrush paper card and the sample drawing was almost invisible. The silver pressing process added a flowing sparkle to the printed matter. "We provide toothbrush enterprises with hard toothbrush paper cards. In order to effectively bond the paper cards and blister shells, the traditional process uses oil-based blister oil, which is diluted with ethyl acetate and coated after dilution. Now we use environmental friendly water-based blister oil, and the cost has increased a lot." Introduction by Guo Chenggen.
Long term achievement: transformation and upgrading towards green and environmental protection
"Paper printing has basically realized the replacement of clean raw and auxiliary materials. Due to the limitation of printing materials, film printing needs to completely change the ink into water-based environmental protection materials. There are some technical barriers. We are exploring this problem and strive to solve it as soon as possible." Guo Chenggen said.
It is understood that in the past two years, the new city has strictly implemented the "source control, pollution reduction and carbon removal PM2.5 and ozone collaborative control". Yang Yuyu, deputy director of the new city management committee, led a team to carry out research and study in other places in conjunction with the district environmental protection Department, and learned from the advanced practices of other regions. Through such measures as strict market access, strengthening investigation and rectification, establishing a positive list, and improving the standard system, the new city has solidly promoted the implementation of clean raw material substitution in key industries in the region, Supervise and urge enterprises to implement source substitution and process transformation, promote the transformation and upgrading of the packaging and printing industry in the whole district to the direction of green environmental protection, and reflect the responsibility and contribution of the new city in the overall environmental protection work of the city.