Starting on July 9, 2021.
Plastic processing plants have a wide range of products, such as: injection products, tubes, rods, wires, plates, sheets, films, artificial leather, wallpaper, various coating products, various composite reinforced products, lamination Products, hollow containers, sintered products, slush molded products, blow molded products, etc. In the 1930s, plastic processing was mostly manual workshops; in the 1940s, it gradually developed into semi-mechanized small factories; after the 1950s, there were large-scale plastic processing plants with specialized products, as well as large-scale comprehensive processing enterprises; 70 Since the 1990s, many large-scale conglomerates that produce synthetic resins have set up plastic processing plants. For example, General Electric Company in the United States produces polycarbonate and also processes polycarbonate sheets; Beijing Yanshan Petrochemical Company in China produces polypropylene and also processes polypropylene. Acrylic products. The characteristics of plastic processing plants are:
① The products of plastic processing plants are mostly large and light-weight items. In order to reduce or facilitate transportation, large-scale plastic processing plants should be built at the point of use or close to the transportation line.
②The scale of factory construction can range from tens of tons to tens of thousands of tons per year, and generally should not be too large; the product varieties can be single or diverse.
③ If the plastic processing factory is located in an urban area, the production process should be arranged three-dimensionally to save land; if it is located in the suburbs, it can be arranged horizontally without occupying cultivated land to save money and speed up civil construction. schedule.
④The ventilation, air conditioning, dust removal, lifting and transportation conditions of the factory building should be designed according to the requirements of the production process. For example: when producing transparent and precision products, air conditioning and dust removal must be considered; workshops where toxic gas escapes must strengthen exhaust and ventilation; in order to hoist large molds and inspect heavy equipment, lifting and transportation machinery must be installed.
⑤ Most of the mechanical operations in plastic processing plants are driven by electric motors; the heat source mostly uses electricity, but also superheated water or steam; the cold source mostly uses cooling water or air. Therefore, water supply and power supply to the processing plant are essential conditions. If the water source is tap water, recycling and recycling must be considered.
⑥The emissions during production include waste gas, waste water and waste materials. Most of them are non-toxic substances, but a few are toxic. For example: toxic gases such as fluorine isobutylene are produced when fluorine-containing plastics are sintered and decomposed at high temperatures; unstripped polyvinyl chloride contains toxic vinyl chloride monomer, which will escape during processing; some stabilizer dust containing lead and heavy metals It can also fly away during processing; some plastic additives are also toxic. Therefore, effective measures need to be taken to eliminate it.
⑦ Certain equipment in the processing plant will produce noise during operation, and a few exceed 85dB, so sound insulation and silencing measures need to be taken.