Since the "Twelfth Five-Year Plan", with the improvement of people's living standards and the rapid development of social economy, environmental protection problems have appeared one after another, especially the severe smog and severe PM2.5 in the air exceeding the standard One of the important substances is VOCs. To this end, the state has issued strict environmental protection policies, which put forward higher requirements on the VOCs emissions of enterprises.
For flexible packaging enterprises, the governance of VOCs is a difficult and complex process, which is difficult to manage, and the one-time investment and operating costs are high. As the company continues to grow and develop, the gravure production line is gradually increasing, and the VOCs generated are also increasing. Before taking VOCs treatment measures, according to statistics, our company ’s gravure production emits more than 800 tons of VOCs per year. Exhaust gas, the annual emission of exhaust gas is more than 1,000 tons. If such a large amount of exhaust gas is not properly rectified, it will cause serious environmental pollution.
For this reason, our company started the road of VOCs governance. Through continuous trial and exploration, we have also achieved some achievements and gains. This article, the author will share this, I hope to bring some reference and inspiration to the industry.
Reduce the use of solvents from the source
01 Ink selection
The production of flexible packaging gravure inks is being restricted by many regulations, so the development and application of green gravure inks that meet environmental protection requirements will become an inevitable trend.
(1) Reduce the types of solvents in existing inks
The more types of solvents in the ink, the more difficult it is to recover. The main countermeasures adopted are: as far as possible, choose a binder with good solvent release and add additives to facilitate the volatilization of aromatic hydrocarbons. Generally, the solvent is ethyl acetate, N-propyl ester, reduce the use of butyl ester.
(2) Alcohol-soluble ink without benzene and ketone
Due to stricter solvent residue requirements, currently major ink manufacturers have launched alcohol-soluble inks. Such ink does not contain aromatic hydrocarbon and ketone solvents, esters and alcohols containing only a solvent having a light smell, prints and high brightness, its use will increase in the soft packaging gravure Competitiveness in the printing field.
(3) Development of single solvent ink
At present, most of the inks used by flexible packaging companies are mixed solvents, and recycling is difficult. If a single solvent can be used, not only can the recycling cost be reduced, but also 100% recycling can be achieved.
(4) Development of water-based ink
Water-based ink greatly reduces the volatilization of VOCs, improves the printing working environment, is beneficial to human health, and is especially suitable for food, beverages, pharmaceuticals and other products with high hygiene requirements. In addition, water-based ink can also reduce the fire hazard caused by static electricity and flammable solvents, and reduce the residual solvent odor on the surface of printed products. Water-based ink has been widely used in paper printing, but there are still a series of problems in the application of film substrates. At present, our company's water-based white ink has been applied, and other color inks are still in the testing stage.
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