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Standards Development
This document stipulates a measuring method for the distribution of thickness, area mass, gas permeability and collection efficiency in the filter medium, and applies to both woven and nonwoven filter medium.
This document provides a method for sampling specimen (position, size and number) from the filter medium required to obtain its performance distribution accurately. The purpose of this document is to provide more accurate information about the morphology of the filter medium for users, and not to compare grade the performance of the filter medium.
The non-woven filter medium for bag filter systems, which remove dust particles from dirty gases, is packed densely with relatively thick fibers. The packing structure of fibers (packing fraction and thickness etc.) varies widely depending on the position of the filter medium due to the manufacturing method. Since the non-uniformity of these properties of the filter medium may cause various troubles and reducing the collection performance of the bag filter system, it is necessary to measure and clarify of the distribution of each property based on globally consistent methods and standards.
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