Policy Background
• March 1, 2018 will be formally implemented by the Ministry of Industry and Information Technology, "the agricultural film industry standard conditions (2017 version)" to encourage enterprises to carry out the recovery of waste plastic sheeting and processing, waste recycling equipment.
• October 14, 2017 formally promulgated the mandatory national standard "polyethylene blow agricultural land cover film," the national standard will be implemented May 1, 2018. The new national standard will promote higher thickness, better performance The promotion of the use of agricultural film, plastic film is conducive to the recovery and reuse.
• On May 16, 2017, the Ministry of Agriculture released the Action Plan on Plastic Film Recycling to strengthen the management of agricultural film pollution and improve the resource utilization of waste plastic film.
In this context, in 2017, Gansu, Xinjiang and Inner Mongolia initiated the construction of dozens of demonstration sites for the recycling of used mulch and achieved the full promotion and use of thickened mulch. The recovery and processing system was basically established. The mulching film recovery rate reached more than 80% Realize the basic utilization of plastic mulch.
At present, the recycling of waste plastic sheeting technology in China mainly in the plastic sheeting recycling technology, plastic sheeting reuse technology and agricultural film biodegradable technology in three directions.
1, Plastic film recycling technology
In developed countries such as Europe, the United States and Japan, the plastic film is thick and generally covers cash crops such as vegetables and fruits. The cover period is relatively short, and the main type of recycle machine is the rewinding machine.
China's film recycling is relatively easy, basically reached 100% recovery.While the agricultural film is thin, the intensity is small, covering a relatively long, clear fragile, easy to recover.For the characteristics of China's agricultural film, the relevant units developed a variety of Type of residual film recycling machine.Among them, the drum-type film recycling machine research is more concentrated, the drum with retractable rod pick-up drum, pick the arc pick film pick roller, spring tooth roller, grip pick-up drum, comb tooth Tube and other structures.
However, relying solely on mechanical plastic film recovery is still not satisfactory, and the inclusion rate is high, but also requires a lot of labor. "Plastic film recycling action program" pointed out that the plastic film recycling as an integral part of the mechanization of production to promote the formation of plastic film recycling operations professional Organize and comprehensively promote the mechanization recovery, strengthen the research, development and technical integration of the plastic film recovery equipment and promote the formation of a comprehensive solution to the mechanized pickup of the regional film.
2, Agricultural film reuse technology
After the recovery of the agricultural film after crushing, sorting, cleaning, granulation and other processes made of plastic particles can be used to regenerate plastic sheeting or other plastic products.
However, as the waste plastic film, especially the mulch film contains a large amount of soil and plant straw, it is difficult to recover and treat, which consumes a large amount of water and electricity. Meanwhile, wastewater treatment also requires a lot of manpower, material resources and financial resources, resulting in poor economic benefits and serious environmental pollution.
Therefore, many companies focus on research and development in line with environmental protection requirements of waste film treatment of new technologies.At present, the membrane of non-aqueous cleaning technology, waste film anhydrous heating granulation technology, agricultural film dry wet pre-recovery line, agricultural land Recycling of residual membrane recycling line and renewable granulation of environmental protection equipment and other advanced technologies are being promoted trial or large-scale production.
The traditional fragmented family workshop waste film processing and processing methods will inevitably be eliminated under the environmental protection policy, large-scale non-polluting waste film processing technology will become the mainstream of the industry, how to reduce the technical costs, to achieve large-scale production, so that new Technology effectively solve the problem of China's agricultural film pollution has become the focus of the industry.
3, Agricultural membrane biodegradation technology
Globally, the share of biodegradable films in Europe and Japan in the film market has been steadily increasing, currently exceeding 10% and the application rate is higher in some regions.
Since 2011, China has set up a biodegradable plastic film suitability evaluation base in nine provinces and municipalities. The comprehensive biodegradable plastic film products have been evaluated in major domestic research institutes and enterprises.
Although biodegradable plastic film has made a breakthrough, but its industrialization and promotion of slow progress .Main reason:
a due to the general lack of mechanical strength, large-scale operation difficult, which is limiting the biodegradable film is widely used one of the important reasons;
b biodegradation mulching time and degradation of poor controllability, temperature and moisture conservation is poor, it is difficult to meet the needs of different climatic conditions and crop growth;
c Compared with the ordinary PE film, the high cost is an important limiting factor for the large-scale popularization and application of the biodegradable film.
In summary, the recycling of waste plastic film technology in urgent need of improvement and development.In my opinion, especially waste film recycling technology, in line with the environmental requirements of the premise, to enhance the comprehensive utilization of waste film technology is both economic feasibility One of the high ways.
The "Action Plan for Plastic Film Recycling" points out that by 2020, the national network of plastic film recycling will be continuously improved and the level of resource utilization will continue to increase, and the rate of plastic film recycling will reach over 80% and the "white pollution" will be effectively prevented and controlled. It seems that to reach 80% of the recycling rate needs the wisdom and strength of the entire industry, as a waste plastic people is duty-bound.