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Filter refers to an accessory that filters impurities or gases through filter paper. Generally refers to the car filter, which is an engine accessory. According to different filtering functions, it is divided into: oil filter, fuel filter (gasoline filter, diesel filter, oil-water separator, hydraulic filter), air filter, air cabin filter, etc. The engine has three kinds of filters: air, oil, and fuel, which are generally called "three filters", plus a cabin air filter, commonly called four filters. Responsible for the filtration of the lubrication system, the medium in the combustion system, the engine air intake system, and the cabin air circulation system. Filters are an industry that is in short supply, and its production capacity is far behind the growth rate of demand. As far as foreign brands are concerned, the prosperity of the global market has caused the sales of Terex-Demag, Liebherr, Manitowoc and other manufacturers to increase by about 40%, but because the filters themselves are all ordered The parts produced and matched with the main engine are also shipped according to orders. In addition, due to the influence of the manufacturer's own production capacity, the extension of the supply cycle is inevitable. Insufficient production capacity and shortage of key components plague manufacturers and users. So what about China's filter industry on the premise of a good environment? Since China joined the WTO in 2001, it has entered its tenth year. China's automobile industry has achieved rapid development in this decade. The automotive filter industry, which is inseparable from the development of the entire vehicle, is also developing rapidly. my country exported 58.775 million auto filters, an increase of 13.57% over 2010, and the amount involved was US$127 million, an increase of 41.26% over 2010.