China has made adjustments to its policy in the direction to control exports of high energy consuming and heavily polluted products as well as resource products. Furthermore, China has strengthened its environmental conservation projects. As a result, there is an expanding demand for bag filters with high dust-collecting ratios of smoke and soot countermeasures indispensable for the reduction of air pollution. In addition to the elimination of secondary pollution, bag filters are highly effective in the recovery of useful substances. Sales of the bag filter industry in 2005 were 6.5 billion yuan. The production volume of filter materials in China in the same year was 40 million sq. …
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