Method of producing composite
US-2016339394-A1 · Nov 24, 2016 · US
Filter medium and filter unit
US10071334B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10071334-B2 |
| Application number | US-201615567678-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 2, 2016 |
| Priority date | May 7, 2015 |
| Publication date | Sep 11, 2018 |
| Grant date | Sep 11, 2018 |
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Abstract
Official abstract text for this publication.
A filter medium includes a first porous polytetrafluoroethylene membrane, a first air-permeable support member, a second porous polytetrafluoroethylene membrane, and a second air-permeable support member. A surface of the filter medium is formed by the first porous polytetrafluoroethylene membrane. A bond strength, as measured by a 180° peel test, between the first porous polytetrafluoroethylene membrane and the first air-permeable support member is higher than 1.2 N/25 mm and higher than a bond strength, as measured by the 180° peel test, between the first air-permeable support member and the second porous polytetrafluoroethylene membrane.
First claim
Opening claim text (preview).
The invention claimed is: 1. A filter medium comprising a first porous polytetrafluoroethylene membrane, a first air-permeable support member, a second porous polytetrafluoroethylene membrane, and a second air-permeable support member that are stacked in this order and bonded to one another, wherein a surface of the filter medium is formed by the first porous polytetrafluoroethylene membrane, and a bond strength, as measured by a 180° peel test, between the first porous polytetrafluoroethylene membrane and the first air-permeable support member is higher than 1.2 N/25 mm and higher than a bond strength, as measured by the 180° peel test, between the first air-permeable support member and the second porous polytetrafluoroethylene membrane. 2. The filter medium according to claim 1 , wherein the bond strength between the first porous polytetrafluoroethylene membrane and the first air-permeable support member is 1.8 N/25 mm or more. 3. The filter medium according to claim 1 , wherein the bond strength between the first porous polytetrafluoroethylene membrane and the first air-permeable support member is 2.5 N/25 mm or less. 4. The filter medium according to claim 1 , wherein the first air-permeable support member and the second air-permeable support member are each a non-woven fabric, and the non-woven fabric is an embossed non-woven fabric. 5. The filter medium according to claim 1 , wherein the first air-permeable support member and the second air-permeable support member are each a non-woven fabric, and the non-woven fabric is an embossed non-woven fabric that has a sea-island structure when viewed in plan, and in the embossed non-woven fabric, a portion corresponding to the sea is a recessed portion, and a portion corresponding to an island is a projecting portion. 6. The filter medium according to claim 1 , wherein a collection efficiency for particles having a particle diameter in a range of 0.1 to 0.2 μm is higher than 90%. 7. The filter medium according to claim 1 , wherein the filter medium is pleated. 8. A filter unit comprising: the filter medium according to claim 1 ; and a support frame supporting an outer peripheral portion of the filter medium.
Assignees
Inventors
Classifications
Dry filters · CPC title
Pleat-type membrane modules · CPC title
Synthetic macromolecular fibres · CPC title
4 layers · CPC title
Support layers · CPC title
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Frequently asked questions
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- What does patent US10071334B2 cover?
- A filter medium includes a first porous polytetrafluoroethylene membrane, a first air-permeable support member, a second porous polytetrafluoroethylene membrane, and a second air-permeable support member. A surface of the filter medium is formed by the first porous polytetrafluoroethylene membrane. A bond strength, as measured by a 180° peel test, between the first porous polytetrafluoroethylen…
- Who is the assignee on this patent?
- Nitto Denko Corp
- What technology area does this patent fall under?
- Primary CPC classification B01D46/521. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Sep 11 2018 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).