Biodegradable air filter media and method for manufacturing the same

Abstract

The purpose of this disclosure is to provide a biodegradable air filter material that has a high PF value, sufficient rigidity for practical use, and low environmental impact. [Solution] The biodegradable air filter material according to the present disclosure is an air filter material comprising a wet nonwoven fabric, wherein the fibers of the wet nonwoven fabric are biodegradable fibers, the wet nonwoven fabric contains 0.5 to 10.0% by mass of starch relative to the mass of the fibers constituting the wet nonwoven fabric, the amylose content of the starch is 20% or more, and the pressure loss of the air filter material is 3 to 400 Pa.

Claims

1. A filter material for air filters, including a wet nonwoven fabric, The fibers of the wet-laid nonwoven fabric are biodegradable fibers. The wet-laid nonwoven fabric contains 0.5 to 10.0% by mass of starch relative to the mass of the fibers constituting the wet-laid nonwoven fabric. The amylose content of the aforementioned starch is 20% or more, and A biodegradable air filter material characterized in that the pressure loss of the air filter material is 3 to 400 Pa.

2. The biodegradable air filter filter material according to claim 1, characterized in that the wet nonwoven fabric contains an alkyl ketene dimer as a water repellent.

3. A dispersion step in which biodegradable fibers and starch powder are dispersed in water to obtain a slurry, A papermaking process to obtain a wet sheet by forming the slurry into a sheet using a wet papermaking method, The process includes a drying step of heating the wet sheet to melt and bond the starch and obtain a dry sheet, The slurry contains 0.5 to 10.0% by mass of the starch relative to the mass of the biodegradable fiber. A method for producing a biodegradable air filter filter material, characterized in that the amylose content of the starch is 20% or more.

4. A dispersion step in which biodegradable fibers are dispersed in water to obtain a slurry, A papermaking process to obtain a wet sheet by forming the slurry into a sheet using a wet papermaking method, The aforementioned wet sheet is subjected to an external application step in which an aqueous solution of starch is applied by spraying or impregnation, The process includes a drying step of heating the wet sheet to which the starch has been added externally to melt and bond the starch, thereby obtaining a dry sheet. The wet sheet to which the starch is added externally contains 0.5 to 10.0% by mass of the starch relative to the mass of the biodegradable fiber. A method for producing a biodegradable air filter filter material, characterized in that the amylose content of the starch is 20% or more.

5. The method for producing a biodegradable air filter filter material according to claim 3 or 4, characterized in that the starch is above-ground starch.

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