Porous cellulose body and method for producing same
US-2015093560-A1 · Apr 2, 2015 · US
Method for manufacturing filter medium for air filter
US10556197B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10556197-B2 |
| Application number | US-201515743866-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 3, 2015 |
| Priority date | Aug 3, 2015 |
| Publication date | Feb 11, 2020 |
| Grant date | Feb 11, 2020 |
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Abstract
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A method for manufacturing a filter medium for an air filter having improved particle collection performance using cellulose nanofibers. The method for manufacturing a filter medium for an air filter comprises: causing a mixed solution containing cellulose nanofibers and a dispersion medium to adhere to an air-permeable support; and subsequently freeze-drying the resulting product, in which a number average fiber diameter of the cellulose nanofibers is 1 to 50 nm, the dispersion medium is a mixed dispersion medium of water and a water-soluble organic solvent, and a solid content concentration of the cellulose nanofibers in the mixed solution is 0.001 to 0.150% by mass.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for manufacturing a filter medium for an air filter, the method comprising: causing a mixed solution containing cellulose nanofibers and a dispersion medium to adhere to an air-permeable support; and subsequently freeze-drying the resulting product, wherein the cellulose nanofibers have an average fiber diameter that is in a range of 1 to 50 nm, wherein the dispersion medium is a mixed dispersion medium of water and a water-soluble organic solvent, and wherein the cellulose nanofibers in the mixed solution have a solid content concentration in a range of 0.001 to 0.150% by mass wherein the cellulose nanofibers have an adhesion amount ratio with respect to the air-permeable support in a range of 0.001 to 0.200% by mass. 2. The method for manufacturing a filter medium for an air filter according to claim 1 , the method further comprising: setting an ambient temperature of the mixed solution adhered to the air-permeable support to a temperature equal to or lower than a melting point of the mixed solution in the freeze-drying. 3. The method for manufacturing a filter medium for an air filter according to claim 1 , wherein the filter medium has a PF value that is higher than a PF value of a support by 0.5 or more when a surface wind speed is 5.3 cm/sec and a target particle diameter is 0.10 to 0.15 μm.
Assignees
Inventors
Classifications
- B01D39/18Primary
the material being cellulose or derivatives thereof ({cork or peat B01D39/1646} ; making filter paper D21F11/14) · CPC title
comprising nanofibres · CPC title
the material being filamentary or fibrous · CPC title
After-treatment (C08J9/22 takes precedence) · CPC title
Fibre diameter · CPC title
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- What does patent US10556197B2 cover?
- A method for manufacturing a filter medium for an air filter having improved particle collection performance using cellulose nanofibers. The method for manufacturing a filter medium for an air filter comprises: causing a mixed solution containing cellulose nanofibers and a dispersion medium to adhere to an air-permeable support; and subsequently freeze-drying the resulting product, in which a n…
- Who is the assignee on this patent?
- Hokuetsu Corp, Univ Tokyo
- What technology area does this patent fall under?
- Primary CPC classification B01D39/18. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Feb 11 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).