“There is no rubbish on the earth. Only resources are misplaced.†At the Tianjin Ziya Circular Economy Industrial Zone, when it was discovered that all the automobile dismantling enterprises in Tianjin were gathered here, the pioneer in the field of auto parts and remanufacturing in China and the academician of the Chinese Academy of Engineering Xu Binshi said.
Recently, in the "recycling economy expert line" Tianjin station research, academicians Xu Binshi and Jin Yong of the Chinese Academy of Engineering and more than 10 experts engaged in circular economy research have entered into circular economy enterprises to hold discussions with business management personnel to help them analyze problems and make suggestions. .
“Tianjin is one of the regions that earlier advocated the development of circular economy in China. At present, the city already has six national circular economy demonstration pilots such as Tianjin Economic and Technological Development Zone, Beijiang Power Plant, and Tianjin Ziya Circular Economy Industrial Zone.†Director Yang Zhenjiang said.
The Tianjin Economic and Technological Development Zone has attracted a large number of e-waste, scrap and other resource projects. Taiding (Tianjin) Environmental Protection Technology Co., Ltd. of the park processed more than 23,000 tons of electronic waste last year. The gold extracted from these wastes has 18 kg, thousands of tons of copper. Jiang Zhiping, vice chairman of the company, said that in the North China, more than 150,000 tons of e-waste is produced each year, and less than 10% of the e-waste enters the recycling system. Without policy support, the survival and development of circular economy enterprises will face tremendous pressure.
Professor Du Huanzheng, deputy dean of Zhejiang Jiaxing University, said that at present, the total amount of waste metals that can flow around the world is about 18 million tons, and China can only get 8 million tons of them. He suggested that the country should coordinate the number of circular economy parks as a whole.
Liu Qiang, secretary-general of the China Recycling Resource Recycling Association, said that domestic management of renewable resources has never been unified into one department. He suggested that Tianjin can now issue local regulations or rules based on its own characteristics and provide corresponding preferential policies and safeguard measures.
Water-assisted injection molding: Water-assisted injection molding technology is an advanced injection molding process in which part of the melt is injected into the mold cavity and high-pressure water is injected into the melt through the equipment to finally shape the workpiece.
Due to the incompressibility of water, the water front creates a solid interface, squeezing the inner wall of the product into a cavity, and the water front also acts as a rapid cooling. Therefore, the water supplement has many advantages over the gas supplement. Research and application show that the water supplement can produce thinner and more uniform cavity wall, and the inner surface of the flow channel is very smooth. Especially for thick wall workpiece, the cooling time can be greatly reduced compared with gas auxiliary.
High gloss injection molding: Highlights the basic process of injection molding is prior to injection molding, through the use of high temperature and high pressure steam will mould surface rapidly warming, the forming die cavity surface temperature of resin plastic glass transition temperature (Tg) above, then the plasticizing good plastic melt into the closed mold cavity, the injection stage, mold temperature by high temperature and high pressure steam remains the same, When the injection is finished, the air supply is stopped, and the water vapor in the pipe is blown clean by air pressure of the air pipe. After that, the cooling water is injected to make the mold temperature drop rapidly until the mold is cooled and the product is removed by opening the mold
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