| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter for efficiently collecting the substance to be collected by deciding so that the particle size of a bubble forming material or the like to be used when the filter is manufactured by using a foamed body obtained by an extraction method is matched to the size or the like of the substance to be collected by the filter to be manufactured finally, and to provide a method for manufacturing the filter. SOLUTION: This filter is manufactured by preparing a compact by mixing at least one thermoplastic resin 12, a water-soluble bubble forming material consisting of a granular material whose particle size is set in the prescribed range by classification and which is stable thermally at the hot melting temperature of the resin 12 to keep its shape and a water-soluble macromolecular compound consisting of a granular material whose particle size is set to be almost similar to that of the water-soluble bubble forming material by classification and which functions as a lubricant when heated and by extracting/removing the water-soluble bubble forming material and the water-soluble macromolecular compound from the prepared compact by using water, so that bubbles 16 of the size similar to the particle size of the water-soluble bubble forming material and the water-soluble macromolecular compound are formed in the filter. |
