Energy saving and emission reduction countermeasures in packaging and printing industry
The ecological design of energy conservation and emission reduction in the packaging and printing industry must optimize the policy environment for energy conservation and emission reduction technology innovation and transformation, strengthen the construction of innovation teams, R&D bases and related testing and experimental platforms in the high-tech field of resources and environment, and promote the establishment of enterprises as the main body, industry-university-research institutes A combined energy-saving and emission-reduction technology innovation and achievement transformation system. With industry-leading enterprises as the king, industry professional research institutes as partners, and colleges and universities with strong technical research and development strengths as relying units, the combination of production, education and research is to promote the construction of my country into a resource-saving and environment-friendly society. Contribution to the industry
1. Energy-saving countermeasures in packaging and printing industry
The energy consumption of packaging and printing production equipment is mainly concentrated in the transmission system and drying system, and the following schemes are listed as the research object to save electric energy:
(1) Power quality optimization and energy saving
The use of reactive power on-site compensation technology to improve power factor, reduce losses, save energy, and reduce operating costs is a good technology with less investment and quicker results. From the technical and economical comparison, this method is a simple, practical, and quick-resulting power quality optimization and energy-saving scheme.
(2) Frequency conversion speed control to save energy
For the variable load in the packaging and printing production process, the flow is proportional to the speed; the pressure is proportional to the square of the speed; the power is proportional to the cube of the speed. Frequency conversion fuzzy control technology can be used to save energy: when the motor can work at a lower speed than the rated speed, the output power can be greatly reduced, and the more the speed is reduced, the smaller the output power can be. When the speed drops to 90%, the power drops to 81%; when the speed drops to 80%, the output power drops to 64%; when the speed drops to 50%, the output power drops to 1/8, and so on, to save energy.
(3) Fuzzy control algorithm realizes energy saving
The fuzzy PID control algorithm makes full use of the advantages of fuzzy control and PID control, and avoids the difficult problem of establishing an accurate model. PID parameters can be self-adjusted online. The fuzzy PID controller can improve the steady state characteristic of the system. The author unit applied it to the drying system of the gravure printing machine. On the basis of ensuring various control indicators, it not only improved the drying efficiency of the drying system, but also greatly reduced the use of steam, heat transfer oil and electricity, and reduced the amount of waste gas. The content of pollutants can achieve the purpose of energy saving, economical and environmental protection operation.
(4) Energy saving of heating piping system
The heating pipeline system is to transport the steam from the heat source to the energy consumption point. The heating pipeline system follows the principle of high-pressure delivery and low-pressure use. High-pressure transportation can reduce pipeline costs and reduce heat dissipation losses. The use of low pressure can reduce the grade of the equipment, make full use of the latent heat energy in the steam, reduce the discharge temperature of the condensed water, and reduce the consumption of hot steam. At the same time, the method of reducing the heat dissipation area and preventing steam leakage, and installing on-line detection and control device for reasonable steam supply can also achieve the effect of energy saving.
(5) Optimizing process structure to save energy
For example, effective partitioning is carried out on the drying box of the gravure printing machine, and a new mechanism is adopted to prevent the high-concentration solvent gas from participating in the circulation of the secondary return air, but the heat energy of the exhaust gas can be used, saving energy. There is a cyclone layout on the entire page, which dries the substrate from the inside to the outside, which greatly reduces the content of residual solvent in the product.
(6) Donate auxiliary equipment to save energy
In the drying process of gravure printing, the heat energy generated by the resistance heating element is transmitted to the substrate through the radiator, so that the substrate can be raised to a predetermined temperature. Therefore, improving the heating efficiency of the heating element, strengthening the heat preservation, and reducing the heat loss are important ways to save energy in the drying box. Specific measures: 1. Change the resistance wire to a resistance belt and apply infrared paint to enhance the radiation heat transfer and protect the resistance belt; to prevent heat loss.
In addition, the use of high-efficiency chemical agents, rational use of auxiliary agents, and reasonable arrangement of equipment production processes can effectively shorten the equipment production process and reduce energy loss.
2. Environmental measures in the packaging and printing industry
In order to promote the protection of the ecological environment by packaging and printing enterprises, enterprises should aim at sustainable economic and social development and promote ecological and environmental protection; during the annual review of enterprises, the government printing management department can take environmental protection requirements as an important indicator and include them in the annual review. In the scope of review, companies that do not meet environmental protection standards will be rectified within a time limit; the printing industry associations must cooperate with the government to focus on environmental protection, and must publicize, promote, and use new technologies, new processes, and new materials. Using the new circular economy development model to reduce the harm to the natural environment, the specific environmental protection measures are as follows:
(1) Develop waterless offset printing technology
Waterless offset printing eliminates alcohol fountain solution, so it is of great significance to environmental protection. At present, although there are not many practical applications of waterless offset printing, from the perspective of environmental protection, all new technologies, new materials, new processes and new equipment that are beneficial to the environment will have great development prospects in the future, especially with the digitalization With the development of Ep, U technology, waterless offset printing will eventually become an inevitable choice for people.
(2) Develop environmentally friendly flexo printing technology
Flexographic printing is recognized as one of the most excellent and promising printing methods, because flexographic printing uses water-based ink, which has good printability and excellent environmental performance, and is in line with the green development trend of modern packaging printing.
(3) Develop environmentally friendly inks
UV-curable ink (UV ink for short) is a photo-curable ink that can change from liquid to solid and solvent-free under the irradiation of ultraviolet light of a certain wavelength. It has the characteristics of fast curing speed, green environmental protection and good printing quality. Water-based uV ink has the advantages of both water-based ink and UV ink. Compared with ordinary uV ink, it has the characteristics of non-irritating, non-polluting and safer. It is considered to be an environmentally friendly product with almost zero pollutant emissions. Green" product reputation.
(4) Develop direct plate making technology (CTP) and digital printing
The development of direct-to-plate technology (CTP) reduces the intermediate links such as film output and washing in plate-making, reduces the discharge of waste and waste liquid, reduces environmental pollution, and improves the environmental performance of plate-making and printing technology. . The intelligentization of digital printing technology in improving the working environment, effective use of paper, energy conservation, waste reduction, and resource recycling makes it more green and environmentally friendly.
(5) Pay attention to waste disposal
Since the wastes in the manufacturing process are mainly organic solvents in printing inks, solvents in cleaning agents, varnishes in the glazing compounding process, and a large number of organic volatile compounds (VOCs) produced by solvents in compound adhesives. Therefore, it is necessary to strictly implement VOC emission standards and improve and perfect waste gas treatment technology.
(6) Promote water-based glazing technology
The diluent used in water-based glazing is non-toxic, odorless and non-polluting water, which will be favored by the industry for its unique green environmental protection characteristics.
(7) Development of photodegradable polymer materials
Develop and use chloride-free, photodegradable polymer materials as safe and environmentally friendly plastic packaging substrates. For example, in the fields of plastics, packaging and printing, polyolefin is the best material to replace PVC.