Management methods in the process of Gift Boxes gravure and composite production

Management methods in the process of Gift Boxes gravure and composite production

For the VOCs generated in the process of Gift Boxes gravure and composite production, there are mainly three control measures, namely source control, process control, and end control.

1. Source Control

Source control is to reduce the use of organic solvents in raw and auxiliary materials from the beginning of production, so as to achieve the goal of VOCs emission reduction. The main measures of the composite process are to promote the use of water-based adhesives and solvent-free composite processes. At present, these two technologies have been basically mature and have been widely used; the main measures of the gravure process are to promote environmentally friendly inks with low VOCs or no VOCs emissions. The use of raw and auxiliary materials such as cleaning agents, such as the promotion of gravure water-based inks, single-type solvent inks, etc.

(1) Promote gravure water-based inks and single-type solvent inks

At present, many domestic ink companies are developing water-based gravure inks for Gift Boxes and have made some progress. However, because the drying speed and adhesion fastness of gravure water-based inks have not been completely solved, they are only used locally, and the distance is large. There is still a long way to go to promote the application of the area.

In order to facilitate the recovery of solvents, some ink companies have started the research and development of a single type of solvent ink, but they are still in the research and development stage. In addition, some companies have successfully developed ink solvents for non-petroleum products, and have begun to apply them in some small and medium-sized Gift Boxes gravure printing companies.

(2) Environmentally friendly gravure printing equipment without VOCs emissions

The solvent-free full UV plastic film gravure printing machine uses UV ink, and there is no VOCs emission during the printing process. The equipment has been developed for two years and has now made significant progress. The first solvent-free full UV plastic gravure printing machine in China made its debut at the Print China 2015 exhibition. It was successfully developed by three companies. Shaanxi Beiren Printing Machinery Co., Ltd. provided gravure printing equipment, and Zhongshan Youwei Printing Equipment Co., Ltd. provided gravure printing equipment. UV curing system, Zhongshan Nuobijia Optical Materials Co., Ltd. provides UV ink. The equipment has 5 color groups, its mechanical design speed can reach 200m/min, and the on-site demonstration speed is 150m/min. It can be applied to various paper and film (such as PP, PET, aluminized film, pure aluminum foil and other film substrates) ) printing.

At present, although the related technology of UV plastic film gravure is not very mature and the cost of use is relatively high, it represents a revolutionary technical direction. It is believed that as long as careful exploration and research, high-quality and more perfect solvent-free UV plastic film gravure printing machines and UV plastic film inks will be launched in the future.

2. Process control

Process control means that in the printing process, by improving drying efficiency and improving production site management and other measures, the purpose of VOCs emission reduction is achieved. The main measure of process control is to carry out technological innovation on the printing machine, so as to reduce the air volume and increase the concentration of the exhaust gas emitted from the production, and at the same time increase the utilization rate of heat energy. For example, increase the LEL device, reduce the volatilization of organic solvents on the workshop site, cover the semi-closed ink tank and the ink tank, and increase the fully enclosed ink blocking device.

3. Terminal management

At present, there are two main directions for end-to-end treatment: one is recycling, and the other is combustion treatment. In addition, some Gift Boxes gravure companies use plasma technology to harmlessly treat exhaust gas. At present, some large-scale Gift Boxes gravure printing enterprises in the industry have begun to recycle, burn or plasma harmlessly discharge exhaust gas (solvent), but as far as the national Gift Boxes gravure printing industry is concerned, the proportion of enterprises adopting such practices is very small ( less than 1 percent currently).

(1) Recycling method

The recovery method mainly collects and separates organic gas phase pollutants by physical methods, changing temperature, pressure, or using selective adsorbents and selective permeation membranes, mainly including adsorption, absorption, condensation and membrane separation technologies. The recovered volatile organic compounds can be directly or simply purified and then returned to the process for reuse to reduce the consumption of raw materials, or used in production processes with low organic solvent quality requirements, or centralized separation and purification.

The organic solvent of the dry composite process is single and the concentration of waste gas is high, and its solvent recovery technology is currently relatively mature. The Gift Boxes gravure printing enterprises adopting the dry compound VOCs solvent recovery system have not only achieved good social benefits, but also achieved obvious economic benefits. However, for the gravure printing process of Gift Boxes, although the organic solvent in the exhaust gas can also be effectively recovered, due to the large investment in the recovery system, high operation and maintenance costs, insufficient purity of the recovered solvent, and the ester solvent recovered by printing has a sour taste For other reasons, the economic benefits obtained are not obvious. In addition, the country has not issued a unified VOCs emission limit policy for the gravure printing process. Most gravure printing enterprises do not actively treat organic waste gas, but discharge directly or simply treat it at high altitude.

(2) Regenerative catalytic combustion method

Regenerative catalytic combustion waste gas treatment is to reheat the organic waste gas discharged from the printing and composite production process, decompose it into carbon dioxide and water vapor under the catalysis of heavy metals, and then discharge it to the outside through the exhaust fan. , the heat energy generated by combustion can be collected and utilized. At present, some domestic Gift Boxes gravure enterprises have adopted this process to treat organic waste gas, and achieved good results.

(3) Low temperature plasma technology

The principle of low-temperature plasma technology to treat organic waste gas is: under the action of an external electric field, a large number of energy-carrying electrons generated by dielectric discharge bombard organic waste gas macromolecules to ionize, dissociate and excite them, and then trigger a series of complex physical and chemical reactions , so that complex macromolecular organic waste gas is converted into harmless substances, so as to achieve the purpose of degradation.

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