Patent ID: 8012231
Filing Date: 2011-09-06
Classification: B01D,G01N,Y10S

Abstract:
1. A thin flexible filter for collecting particulate matter and measuring the concentration thereof, to allow a sample gas to be sampled using a sampler comprising a sampling pump which continuously sucks a sample of a gas to pass through the filter, thereby collecting any suspended particulate matter in the gas and to enable measuring of a mass of the particulate matter after collection, and to enable measuring a concentration of the particulate matter, the filter having a two-layer structure for storage of collected suspended particulate matter, consisting essentially of: a filter main body having a gas porous layer with a main surface area to receive and pass through the sample gas, the gas porous layer is made of a chemical stable fluororesin with a hygroscopicity characteristic to avoid absorption of a liquid and an electrification characteristic, and a gas-permeable reinforcing layer which is provided on one surface of the gas porous layer, wherein the reinforcing layer is laminated in constant contact to be adhered across the entire main surface of the gas porous layer to provide strength against passage of the sample gas flow through the gas-permeable reinforcing layer, wherein the reinforcing layer is made of a porous resin material with a de-electrification characteristic and a hygroscopicity characteristic to avoid absorption of a liquid, and the constant contact with the gas porous layer across the main surface assures that de-electrification characteristic neutralizes the electrification characteristic of the gas porous layer, while maintaining a flexible characteristic for the filter to operatively bend from an operative thin planar shape for collecting suspended particulate matter in the sample gas.