With the upgrading of the era of development, technology, and now, for the packaging industry has made great contributions to the gravure printing, began to face the challenges and baptism of the market after a nearly 20 years of rapid development: environmental protection is a major issue facing the intaglio printing European and American countries have enacted legislation to protect the environment as early as 20 years ago, and made regulations and restrictions on VOC emissions. In China, VOCs emission control has just started, and many problems need to be solved. The requirements for developing clean energy and reducing energy consumption are within the industry. Increasingly loud voices; equipment should be more intelligent; the market demands for equipment efficiency and working environment is getting higher and higher; customers require full control of the entire production process; “quantitative value†is the customer's assessment and decision on their investment. Paths... These problems may seem complicated, but a detailed analysis can be concluded that the development trend of gravure printing is: environmental protection, energy saving, and smart factories.
Environmental protection
In 2012, the State Council officially approved the “Twelfth Five-Year Plan for Air Pollution Prevention and Control in Key Areasâ€. For the first time, VOC control was an important part of the environmental impact assessment of construction projects. For the first time, in the national documents, the treatment and emission reduction of VOCs were clearly defined. purpose. The "Plan" mentioned that "the control of volatile organic pollutants is an important part of environmental impact assessment of construction projects, and strict pollution control measures are adopted", and it is proposed that key control areas, key emission enterprises, and enterprises within key regions will be strictly Monitoring and management. Recently, a series of national and local regulations have been issued, especially for the printing industry , such as Beijing. For existing printing companies, the sewage charges of 2000-2500 yuan will be added for every 1 ton of solvent used; Shanghai will be this year. VOCs emissions from the printing industry will be banned at the end of the year; Jiangsu will ban VOCs emissions from the printing industry in mid-2016. These stringent regulations are promoting product upgrades and corporate transformations in the industry.
The treatment methods for VOCs include recovery and RTO thermal storage oxidation. However, China's related technologies are not very mature, and there are still many problems, such as rapid decline in adsorption rate, solvent acidification, safety problems, and separation treatment in the late stage of mixed solvent. ,and many more. In fact, adopting a set of effective methods and high-quality equipment is the law to deal with the problem. The author believes that the process of adsorption-recovery-condensation-rectification can be carried out on the discharge of a single solvent, so that the high-purity solvent can be recycled, which is environmentally friendly and economical. For mixed solvents, RTO treatment can be used to recover thermal energy. In addition, before implementing these two VOCs treatment measures, the original equipment can be modified and LEL safety cycle equipment can be installed, which can reduce the investment of VOCs and RTO thermal oxidation equipment by more than 40%.
Energy saving
In the printing process, the VOCs are discharged while consuming a large amount of heat energy, which is the latent heat of vaporization of the solvent required for printing drying itself and the residual heat taken away by the exhaust of the VOCs. Calculated according to the amount of solvent used in traditional printing, the theoretical heating power of a color group is 5 to 10 KW, and in practice the drying power is often 30 to 72 KW or even higher. The energy consumption required for drying in the printing industry accounts for 2% to 5% of the total product cost, while the profits of the traditional printing industry are maintained at this level, so if there is a technology that can reduce the drying energy consumption of traditional printing. Half, then it means that the company's profits will double. In terms of the application of high-efficiency energy-saving measures, people in Northwest Shaanxi have taken the lead in introducing two efficient energy-saving methods in China: heat pumps and heat pipes. When the drying temperature required for printing is lower than 100 ° C, a heat pump can be used, and when the drying temperature required for printing is higher than 100 ° C, a heat pipe is used.
Heat pump
Heat pumps typically save 60% to 70%. At present, 25% of printing enterprises in the country use electricity as heating energy. If these printing companies switch to heat pumps, the national printing industry can save 1.02 billion kWh per year, equivalent to the total power generation of Liujiaxia Hydropower Station for 2 months. Reduce emissions by 100,000 tons of carbon dioxide. As of September this year, the national heat pump installed capacity has exceeded 1,000 units.
2. Heat pipe
Heat pipe technology has been widely used in aerospace, military and other industries. Since it was introduced into the radiator manufacturing industry, people have changed the design of traditional radiators.
The working principle of the heat pipe heat exchanger is: the exhaust gas passes through the evaporation end of the heat pipe heat exchanger, one end of the heat pipe is heated, the medium liquid in the capillary tube evaporates rapidly, and the steam flows to the other end (condensing end) under a slight pressure difference, and the fresh air passes. When the condensation end, the medium vapor in the heat pipe releases heat and then recondenses into a liquid, and the liquid flows back to the evaporation end along the porous material inside the heat pipe by the capillary force, so the circulation is not limited, and the heat is transferred from one end of the heat pipe to the other end. . The heat transfer of the heat pipe is carried out by the phase change of the medium in the pipe, which is efficient and rapid, and the heat transfer efficiency can be up to 60% or more. Because it is designed according to the evaporation principle, the higher the working temperature zone of the heat pipe, the more obvious the energy saving effect, and the energy saving is usually between 35% and 55%.
Smart factory
Intelligent manufacturing and smart factories that have been applied in the context of Global Industry 4.0 have been rapidly expanding. Today, many industries such as automobile manufacturing, chemical engineering, and logistics are changing, and Industry 3.0 is the basis for Industry 4.0. Traditional printing companies produce according to the skills of workers and the flow of paper information. They are inefficient and consume energy-consuming materials. Enterprises are big but not refined and lack market competitiveness. It can be said that China's printing industry is still in the industrial 2.x era, or even lower. According to the characteristics of the printing industry, people in the northwest of Shaanxi have developed a digital-based intelligent factory development model for the printing industry.
The printing and packaging intelligent factory is a complex and huge system, which is mainly composed of intelligent logistics system, enterprise management software, production information collection system and intelligent production equipment. Through the cooperation of various systems, a fully functional and highly automated intelligent digital factory is built. In a smart digital factory, devices and devices are interconnected, people are connected, and people and devices are interconnected. That is, physical objects in the system communicate in the information system and communicate cross-border information. Each system achieves cross-integration.
In the printing and packaging smart factory, printing and packaging equipment is no longer the only or independent main production equipment, but a part of the entire intelligent production process. The whole system is coordinated to realize intelligent scheduling - automatic transportation of materials from the intelligent warehouse to the printing equipment ; the operator of the printing equipment does not need to load and unload the volume, the intelligent equipment can automatically complete the upper and lower rolls; the process parameters of the whole equipment are sent by the MES system To the device, the device automatically reads and writes and completes the parameter setting. In this way, equipment operators only perform supervision and inspection, which can reduce the number of enterprise personnel by 50%.
Environmental protection, energy saving, and smart factories are the future development trends of gravure printing. It is believed that with the popularization of the above technologies in the industry, traditional printing enterprises will be reshuffled and integrated, and inefficient and environmentally friendly small enterprises will be forced to shut down and turn, and the disorderly competition in the market will become orderly competition. Let the industry move along the path of healthy development.
Stretcher Trolley,Hospital Stretcher Trolley,Detachable Stretcher Trolley,Stainless Steel Stretcher Trolley
NANJING TIANAO MEDICAL INSTRUMENTS MANUFACTURE CO.,LTD. , https://www.tianaomedical.com