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PCB embryonic stage and environmental impact

2021-12-11

PCB embryonic stage and environmental impact

Understand electronic carrier PCB board from professional vision

PCB is an important electronic component, the support of electronic components and the carrier of electrical connection of electronic components. Because it is made by electronic printing, it is called "printed" circuit board.
PCB raw materials: in the early 20th century, it was the embryonic stage of the development of PCB substrate material industry. The development characteristics are mainly reflected in the emergence of a large number of resins, reinforcing materials and insulating substrates for substrate materials, and preliminary exploration has been made in technology. All these have created necessary conditions for the emergence and development of copper clad laminate, the most typical substrate material for printed circuit board. On the other hand, PCB manufacturing technology with metal foil etching (subtraction) as the mainstream has been initially established and developed. It plays a decisive role in determining the structural composition and characteristic conditions of copper clad laminate.
PCBs: PCBs are a synthetic organic compound commercially used in North America from 1929 to the late 1970s. Although Canada has not processed and produced this chemical substance, it has also been widely used in electrical equipment insulation, heat exchanger, water conservancy system and other special applications.
After decades, some scientific departments have realized that polychlorinated biphenyls pollute the global environment. It is a mixture of various chlorinated biphenyls, which is very harmful to human body. The Canadian government has taken measures to try to eliminate PCB, but the phenomenon of illegal import, processing and sales of PCB occurred in Canada in 1977, and PCB was illegally released into the natural environment in 1985. The Canadian Constitution allows PCB equipment owners to continue to use PCB until the service life of the equipment. Since 1988, provincial governments in Canada began to regulate the storage, transportation and destruction of PCBs.
PCB is not easy to decompose in the natural environment and spreads very far. During production, processing, use, transportation and waste treatment, PCB enters the air, soil, rivers and oceans. Small marine organisms and fish suck PCB into the body, and they become the food of large marine organisms. In this way, PCB enters all marine organisms, Including mammals and marine life. The accumulation of PCB in marine organisms far exceeds its content in water, almost thousands of times.