Porous textile fabric, filter element, method for the production thereof and use thereof

Patent metadata

Field	Value
Publication number	US-11198099-B2
Application number	US-201716346088-A
Country	US
Kind code	B2
Filing date	Oct 30, 2017
Priority date	Oct 31, 2016
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

The present invention relates to a porous sheet product, to a filter element comprising the porous sheet product, to a method for producing the porous sheet product, to a method for producing the filter element, and to the use of the sheet product and of the filter element.

First claim

The invention claimed is:

1. A filter element comprising:
a porous sheet product having at least one of the following ply A and at least two of the following ply B:
A: a porous membrane; and
B: a porous separation ply constructed from polyolefin core-sheath fibers, the sheath material having a lower melting temperature than the core material;

the porous sheet product exhibiting a radiation resistance of at least 20 kGy, wherein the plies A and B lie on top of one another in a loose manner without being firmly connected to one another and the two external plies of the sheet product are formed by one ply B in each case, and
at least one anchoring element, and
edge regions of the porous membrane A being embedded into the anchoring element in a fluid-tight manner.

2. The filter element as claimed in claim 1 ,
wherein the core material of the porous separation ply B is polypropylene and the sheath material of the porous separation ply B is polyethylene.

3. The filter element as claimed in claim 1 , wherein the porous membrane A is hydrophobic.

4. The filter element as claimed in claim 1 ,
wherein the porous membrane is constructed from a polymer selected from the group consisting of polyethersulfone, polyvinylidene fluoride, a polyolefin, and mixtures thereof.

5. The filter element as claimed in claim 1 , which consists of the ply sequence BAB or BAAB.

6. The filter element as claimed in claim 1 , which is an air filter.

7. A method for producing the filter element of claim 1 , comprising:
(I) providing a porous sheet product; having at least one of the following ply A and at least two of the following ply B:
A: a porous membrane; and
B: a porous separation ply constructed from polyolefin core-sheath fibers, the sheath material having a lower melting temperature than the core material;

the porous sheet product exhibiting a radiation resistance of at least 20 kGy, wherein the plies A and B lie on top of one another in a loose manner without being firmly connected to one another and the two external plies of the sheet product are formed by one ply B in each case;
(II) providing the at least one anchoring element; and
(Ill) embedding the edge regions of the porous membrane A into the at least one anchoring element in a fluid-tight manner.

8. The use of the filter element of claim 1 for sterile-filtration comprising a step of sterile filtering.

Assignees

• Sartorius Stedim Biotech Gmbh

Inventors

• Loewe Thomas
• Friese Thomas
• Handt Sebastian
• Strauss Mario
• Nikoloudis Paschalis

Classifications

• B01D71/261

  Polyethylene · CPC title

• B01D71/262

  Polypropylene · CPC title

• B01D71/48

  Polyesters · CPC title

• B01D69/1071 Primary

  Woven, non-woven or net mesh · CPC title

• B01D65/003

  Membrane bonding or sealing · CPC title