Recently, measures to limit the emission of VOCs (volatile organic compounds) have been frequent, and the environmental protection in the printing industry is becoming more and more serious. Although VOCs emissions from traditional offset printing are minimal even compared to gravure printing, compared with gravure printing, with the finer and more comprehensive greening efforts in the printing industry and the need to improve print quality Operators consider the health of the body, some industry professionals have been concerned about the field of traditional offset printing VOCs, VOCs began to actively respond.

Below, the author will start from the current VOCs emission reduction measures on my company over the years in the traditional offset VOCs some experience in reducing emissions, the effect of the VOCs reduction described in the text mostly based on the actual use of our company Calculated for the industry reference.

VOCs for chemicals used in prepress

Material emission reduction

Environmental protection measures: The introduction of new no-treatment / no-wash CTP plate for trial evaluation. Compared with the normal CTP plate, processing-free / wash-free CTP plate material eliminates the development and processing cycle, almost no chemical waste and VOCs. However, at present, the printing plate is more resistant to printing than the ordinary plate, and needs continuous attention until the technology is mature.

Environmental Benefits: Reduce plate-making waste and related VOCs emissions, eliminating the need to purchase developer and developing equipment.

Technology reduction

Environmental Measures: The use of CTP plate-making instead of film plate-making, can greatly reduce toxic and hazardous chemical waste and VOCs emissions. According to statistics, in the process of PS plate making each 2m2 PS version will produce 1L of waste developer, fixing solution and 1L of waste water, and CTP plate due to eliminating the process of developing and fixing, greatly reducing the discharge of waste, Each production of 2m2 CTP version only produce 0.2L waste.

Environmental Benefits: CTP can improve prepress production efficiency, reduce chemical use and reduce VOC emissions by 80%; reduce energy consumption, save prepress and print preparation time, and save manpower.

Environmental Protection Measures: All chemical waste produced by CTP plate-making machine shall be sealed and packed in sealed containers and sent to qualified suppliers for recycling so as to reduce the harm to the environment and VOCs emissions during transportation.

Environmental Benefits: Properly dispose of waste and reduce the harmful effects of chemical waste on the environment. Proper packaging to reduce VOCs during transport.

Environmental protection measures: The use of retaining plate back to the plate. The use of the machine will be used to keep the plates washed clean, and then coated with protective film storage, when needed reuse.

Environmental Benefits: No need to reprint and reprint, reduce the use of plate, reduce the consumption of plate-making chemicals and related VOCs emissions.

Environmental Measures: Developer Filtering Circulation System. The system through the ultrafiltration of the developer for purification, separation and concentration, to achieve recycling. Extend the life of the developer for a long time to maintain a stable developer quality.

Environmental Benefits: Efficient solid-liquid separation, zero discharge of developing waste liquid, greatly reducing developer consumption and related VOCs emissions, reducing plate making costs. At the same time, it can keep the water quality stable and improve the developing quality.

VOCs for inks

  Material emission reduction

Environmental protection measures: Water-based ink. The use of aqueous solvents instead of organic solvents can significantly reduce the ink VOCs emissions. Water-based ink easy to use, good adhesion, colorful, especially for food packaging.

Environmental Benefits: Substituting water and ethanol for organic solvents can reduce VOCs emissions, reduce toxicity to the human body and environmental pollution.

Environmental protection measures: vegetable oil-based ink. The use of vegetable oil to replace part of the traditional ink of mineral oil, can reduce the consumption of oil resources. Soybean ink is the most widely used vegetable oil-based ink. Compared with the traditional ink, it has bright color, high concentration, good gloss, good water adaptability and stability, abrasion resistance, drying resistance and other properties. Pure vegetable oil-based ink is the future direction of development of the ink field, the estimated VOCs emissions below 1%, deserves the attention of the industry.

Environmental protection effect: vegetable oil-based ink plant oil content of ≥ 20%, part of the mineral oil was replaced by soybean oil, VOCs emissions reduced, the pollution of the environment also eased.

Environmental protection measures: UV ink. It is an ink that is cured by ultraviolet light irradiation. However, it should be noted that there are still about 7% of the traditional solvents in the UV ink formulation, and VOCs emissions still exist. UV ink future direction of development is that, combined with the rapid solidification of UV solvents and VOCs advantages of water-based ink, to develop UV water-based ink. Technology reduction

Environmental protection measures: Use ink-saving software. Currently there are many ink-saving software on the market, which is generally replaced by gray component or background removal technology, black ink instead of color ink, and black color separation to be optimized, while maintaining consistency with the original color.

Environmental Benefits: Such software can reduce ink usage by more than 20%, thereby reducing ink VOCs emissions. At the same time can reduce the ink drying time, printing preparation time and reduce the quantitative requirements of the paper.

Environmental measures: the screen soft proofing. Simulation of the display on the print output effect, the display can display consistent with the print, to achieve "what you see is what you get." Screen soft proofing is divided into two kinds of local proofing and remote proofing. Soft proofing can greatly shorten the printing cycle, reduce duplication of effort and improve efficiency.

Environmental Benefits: You can reduce the amount of proofing paper and ink, reduce ink VOCs emissions, shorten the production cycle.

Environmental protection measures: Central ink system. Traditional manual ink filling both effort and easy to produce ink, ink drum residues, waste drums can not handle. The use of the central ink system for centralized ink processing, with the production of high efficiency, save ink, reduce labor intensity, less investment, quick return, green and so on.

Environmental Benefits: Reduce waste caused by manual ink refilling, reduce ink loss by 70% -80% and reduce VOCs by 15% -30%.

Environmental protection measures: Install the secondary combustion system for the drying furnace of the thermosetting rotary printing machine. The drying furnace waste gas concentration for secondary combustion, VOCs gas can be completely combusted decomposition of harmless gas, and finally discharged. The waste heat generated by the secondary combustion is collected to provide hot water for staff dormitories and air conditioning and refrigeration energy for the plant.

Environmental Benefits: Rotary Center drying furnace VOCs After secondary combustion, the VOCs will be decomposed into harmless gases, and cooling for the plant heating, both to reduce VOCs emissions, but also save energy.

  VOCs for fountain solution

  Material emission reduction

Environmental protection measures: switch to alcohol-free / alcohol-reducing fountain solution. In the past, traditional fountain solution generally contained 10% alcohol (isopropanol), and switched to alcohol-free / alcohol-reduced fountain solution to reduce the amount of isopropyl alcohol from 10% to 3%, even without addition The earth reduces VOCs emissions from fountain solutions.

Environmental Benefits: Reduce VOCs emissions, reduce VOCs concentration in factory air, and protect workers' health. Isopropanol content in traditional fountain solution is more than 10%, alcohol-free / alcohol-reduced fountain solution can reduce VOCs emission by 70% .

  Technology reduction

Environmental protection measures: Install "fountain solution filtration system" for printing machines to prolong the service life of fountain solution and reduce the amount of fountain solution as a whole.

Environmental Benefits: According to the experience of some companies, adding a "fountain solution filtration system", each printing machine can save fountain solution 800L per year, 56% less fountain solution than when not installed, reducing more than 90 % Of VOCs emissions. In addition, the ideal ink balance can be maintained to reduce the over-emulsification of the ink, the use of ink can also be reduced by 10%, thus reducing ink-related VOCs emissions.

Environmental protection measures: Waterless printing technology. Waterless printing does not require fountain solution, eliminating the ink balance control, printing quality is better than water offset printing, has good application prospects.

Environmental Benefits: Printing quality is better than traditional offset printing, no waste liquid, no fountain solution, waste disposal costs, VOCs emission reduction, VOCs concentration in workshop air and the printing workers' health.

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