Foam filter and the manufacturing method thereof

Abstract

A foam filter and the manufacturing method thereof is disclosed. The method for manufacturing a foam filter includes the following steps: First, mixing the polyvinyl alcohol (PVA) with water by heating until the PVA is dissolved to form a solution (A) and then cooling said solution (A). At the same time, mixing the vegetable starch with water to form a paste-type solution (B). After that, mixing said solution (A) with said solution (B) to form a solution (C) followed by adding formaldehyde, catalyst and active carbon into said solution (C) to form a paste mixture. Then soaking a polyurethane (PU) foam into said paste mixture and heating said paste mixture to acetalize said PVA therein. Finally, cooling said paste mixture. The foam filter of the present invention is used for filtering the impurities, the toxins, the odors, or the molds in the air or water.

Dependencies are inferred from the claim text.