WO2000004984A1 - Filterelement - Google Patents
Filterelement Download PDFInfo
- Publication number
- WO2000004984A1 WO2000004984A1 PCT/EP1999/004637 EP9904637W WO0004984A1 WO 2000004984 A1 WO2000004984 A1 WO 2000004984A1 EP 9904637 W EP9904637 W EP 9904637W WO 0004984 A1 WO0004984 A1 WO 0004984A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filter
- filter element
- element according
- filter material
- thermoplastic elastomer
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/003—Membrane bonding or sealing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/06—Tubular membrane modules
- B01D63/061—Manufacturing thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/06—Tubular membrane modules
- B01D63/067—Tubular membrane modules with pleated membranes
Definitions
- the invention relates to a filter element with a filter material, in particular a wound and / or pleated filter material, made of a hydrophilic polymer, which is embedded in anchoring elements, such as end caps and / or adapters.
- Porous filter membranes are made from a wide variety of thermoplastic materials, such as : Polypropylene, polyamide, aromatic polyamide, polyimide, polysulfone, polyether sulfone, cellulose derivatives, poly vinylidene fluoride, polytetrafluoroethylene.
- Such filter membranes are often further processed in pleated or wound form into so-called membrane filter cartridges, which are embedded in anchoring elements, in most cases in so-called end caps.
- US Pat. No. 3,457,339 describes the production method for these filter elements.
- Membrane filter cartridges which have been produced by this or similar methods are distinguished by the fact that they can be tested for integrity after wetting with a suitable medium, in particular if the membrane material used has pore sizes in the range from 0.04 to 5 ⁇ m.
- hydrophilic membrane materials such as polyamides or cellulose derivatives, are used in most cases for the so-called sterile filtration of liquids.
- membrane materials which can rather be classified as hydrophobic membrane materials. So that these hydrophobic membranes can also be wetted in a simple manner and used in the filter candles mentioned above, they must be made hydrophilic in special processes. Examples of this can be found in EP 0 571 871 B1, EP 0 082 433 B1, EP 0 228 072 B1, EP 245 000 A3 and EP 0 186 758 B2.
- EP 0 096 306 A2 describes a special process for edge sealing. Hydrophilic membrane filters, such as nylon filters, are sealed with a heat-sealable polyester film, which is coated on one side with a solvent-free polyethylene coating as a hot melt adhesive.
- EP 03 27 025 B1 describes porous membrane filters which, because of the transfer of the membrane structure on one side of the membrane into a film-like state, have fluid-impermeable points.
- EP 00 36 315 B1 also describes a process in which the sensitive area of the porous filter membranes is treated by gluing with it.
- WO 95/14525 describes a method of partially hydrophilizing the sensitive area of the porous filter membrane, the hydrophilic membrane modified according to the invention in its impregnated area intended for embedding preferably having to be at least twice more hydrophilic than in the untreated membrane areas.
- EP 0 096 306 A2 lists the following polymers: polyolefins (polyethylene, polypropylene, polybutylene, polyisobutylene), polyamide, polyvinyl chloride, Polyvinylidene chloride, polyacrylonitrile, polyester, polycarbonate, polymethacrylate, polyalyl and polyoxymethylene. Polytetrafluoroethylene and polytrifluorochloroethylene can also be used. Polypropylene is preferred for the filtration of biological liquids.
- WO 95/14525 also mentions polysulfone and DE 296 20 189 Ul polyefersulfone.
- the ends of the filter materials e.g. Membranes
- the ends of the filter materials e.g. Membranes
- end cap melts of synthetic thermoplastics and the subsequent solidification of the sealing material, undesirable changes to the membranes with regard to physical properties can occur within and immediately outside the fixing area.
- Membranes which consist for example of polyvinylidene difluoride, polysulfone, polyether sulfone or polytetrafluoroethylene, cannot be anchored in the end cap materials mentioned above without massive thermal damage to the membrane.
- Polypropylene is used whenever the filter elements are not easily wettable with water or aqueous solutions for the purpose of the integrity test (or can be wetted with alcoholic solutions), or when the glass transition temperatures or melting temperatures of the membrane materials require the use of the above-mentioned hydrophilic ones Do not allow end cap materials. For this reason, these types of membranes rely on polypropylene with the disadvantage of water repellency at the edges.
- the object of the invention is to provide a filter element in which the properties of the filter material are not adversely affected by the embedding in anchoring elements.
- anchoring elements have a hydrophilic thermoplastic elastomer at least in the embedding area of the filter material.
- the invention is based on the knowledge that for the successful embedding of filter materials in anchoring elements, such as in end caps, the consideration of the melting or glass transition temperatures of the filter materials, the melting temperatures of the end cap materials and the wetting ability of the end cap materials is important.
- the anchoring elements must also have sufficient mechanical stability even at temperatures of up to 145 ° C., since these temperatures are very often used in the form of steam sterilization to sterilize the filter elements.
- the filter material may by this process in no way be torn out of the anchored area, but must remain securely anchored in order to pass the integrity test after cooling and wetting the filter element and to ensure perfect sterile filtration.
- thermoplastic elastomers used according to the invention are polymers which have a rubber-elastic state at low temperatures, in which they cannot be permanently shaped, and which change to a viscous state at higher temperatures and can be processed in this state like thermoplastics.
- This thermoplastic elastomer can be processed into anchoring elements just like thermoplastics, with the additional advantage of the relatively low melting temperatures, which are below 180 ° C.
- these materials have excellent hydrophilicity with a certain flexibility, which is particularly advantageous when embedding sensitive membrane materials.
- Tg soft and elastic segments with high ductility and low glass transition temperature
- Tg hard, crystallizable segments with low ductility and high Tg as well as a tendency to crosslink are present in the polymer.
- the soft and hard segments must be incompatible with one another and exist as individual, non-penetrating phases.
- thermoplastic elements are thermolabile, reversibly cleavable crosslinking points.
- the melting point of the thermoplastic elastomers used is preferably 5 ° C. to 50 ° C. lower than the melting point of the filter material, which is made possible by appropriate adjustment of the proportions of the hard and soft segments.
- thermoplastic polymer is a polyether-polyamide block copolymer.
- Varying the molar mass ratios between the polyamide components and the polyethylene components results in thermoplastic elastomers with different mechanical and chemical properties.
- TPE thermoplastic elastomers
- thermoplastic elastomers With thermoplastic elastomers, it is now possible to sink membrane materials with low melting points in particular into hydrophilic anchoring elements, at least in their edge sections, without complex additional processes and treatments, without fear of impairment or loss of the hydrophilicity or damage to the membrane due to excessive sink temperatures.
- any other filter material can of course also be anchored in the thermoplastic elastomer, since it can serve as a replacement for polypropylene due to the very similar melting temperatures. Especially in those applications where the greatest possible hydrophilicity is also desired in the peripheral zone.
- Another advantage is the possibility of producing the components of the anchoring elements from different materials.
- the components of the anchoring elements can preferably consist of thermoplastic elastomers of different melting temperatures.
- the filter element tip can be made from polyether block amide materials with a high melting point.
- This mechanically most stressed part has excellent mechanical stability at high due to the high melting point Temperatures.
- this part can be connected to end caps made of low-melting copolymers. This has made it possible, for example, to gently embed temperature-sensitive membrane materials in hydrophilic anchoring material and, at the same time, due to the use of special tip parts made of the same material but with a higher melting point, to produce filter elements that can also be used for filter tasks with multiple sterilization at higher temperatures (105 ° C - 145 ° C) are suitable.
- Another preferred embodiment is to make the anchoring element from any polymer, e.g. made of PP, which is coated with a thermoplastic elastomer in the embedding area of the filter material.
- Filter materials made of polysulfone, polyether sulfone, polyphenyl sulfone, polytetrafluoroethylene, polyvinylidene fluoride, cellulose derivatives, polyamide, aromatic polyamide, polyimide or polypropylene are preferably used for the filter element according to the invention.
- the filter material is preferably a filter membrane with a pore size of 0.01 to 10 ⁇ m, preferably 0.1 to 3 ⁇ m.
- the filter membrane can have an integrated, porous fabric as a support material.
- FIGS. 1 and 2 two end caps in section.
- Pleated filter cartridges with membranes with a pore diameter of 0.2 ⁇ m and a membrane area of 0.7 m 2 were manufactured, both membranes made of polysulfone and polyether sulfone being used for the sinking and tested with different methods.
- the membranes were anchored in polypropylene and polyether block amide end caps for comparison.
- the wetting of these filter cartridges was checked by air diffusion measurement (pressure maintenance test or integrity test) at 2.7 bar, each after wetting under the following conditions:
- Pleated polysulfone membranes are anchored in polypropylene and polyether block amide end caps and the wettability of the filter elements is checked: Average values of the measured air diffusion (mL / min) from 8 filter cartridges
- the filter elements from Example 1 were over a period of 20 min. rinsed with water at a differential pressure of 0.2 bar, then dried for 12 hours at 80 ° C and the rewettability checked:
- Pleated polyether sulfone membranes were anchored in polypropylene and polyether block amide end caps. The previously rinsed and dried filter elements were then autoclaved in the dry state up to 10 times. The wettability of the filter elements was checked after each autoclaving by rinsing the elements with water at a maximum differential pressure of 0.3 bar over a period of 10 min. checked using the air diffusion measurement at 2.7 bar:
- the filter candles which are equipped with polyether block amide end caps, show clear wetting and rewetting advantages. Even under dramatic conditions such as autoclaving dry filter elements, the rewettability of the filter elements is good and even. Very low wetting pressures can be selected in order to completely wet the elements, in contrast to the elements equipped with polypropylene end caps, which no longer fully wet with increasing number of cycles.
- FIG. 1 shows an anchoring element 1 which has an end cap 3 and a tip 2.
- a pleated filter material 6 is embedded in the end cap 3, which is shown as a filter membrane 7 with an integrated porous sheet 8.
- the anchoring element 1 has different materials.
- the end cap 3 is made entirely of a low melting point thermoplastic elastomer, while the tip 2 is made of a high melting point thermoplastic elastomer.
- the tip 2 and end cap 3 are connected to one another by means of mirror welding.
- FIG. 2 A further embodiment is shown in FIG. 2, in which the anchoring element 1 in the area 4 facing away from the filter material 6 consists of polypropylene, which is coated with a thermoplastic elastomer 5 in the embedding area of the filter material 6. Due to the similar melting points, the embedding process is easily possible by melting the material.
- the fact that the filter material 6 is also embedded in the polypropylene material 4 has no effect on the hydrophilicity of the filter material, because the filter material 6 is embedded in a layer of thermoplastic elastomers 5 in the transition region.
- the thickness of the layer 5 is, for example, 3 mm. Typical layer thicknesses are in the range of 0.5 to 4 mm.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU51563/99A AU5156399A (en) | 1998-07-21 | 1999-07-03 | Filter element |
EP99936476A EP1105206A1 (de) | 1998-07-21 | 1999-07-03 | Filterelement |
JP2000560970A JP2002521174A (ja) | 1998-07-21 | 1999-07-03 | 濾過素子 |
KR1020017000741A KR20010074723A (ko) | 1998-07-21 | 1999-07-03 | 필터 요소 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19832658A DE19832658C1 (de) | 1998-07-21 | 1998-07-21 | Filterelement |
DE19832658.0 | 1998-07-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000004984A1 true WO2000004984A1 (de) | 2000-02-03 |
Family
ID=7874731
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/004637 WO2000004984A1 (de) | 1998-07-21 | 1999-07-03 | Filterelement |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1105206A1 (de) |
JP (1) | JP2002521174A (de) |
KR (1) | KR20010074723A (de) |
AU (1) | AU5156399A (de) |
DE (1) | DE19832658C1 (de) |
WO (1) | WO2000004984A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150041386A1 (en) * | 2012-04-27 | 2015-02-12 | Sartorius Stedim Biotech Gmbh | Filter element with improved testability after dry steaming |
WO2018077476A1 (de) * | 2016-10-31 | 2018-05-03 | Sartorius Stedim Biotech Gmbh | Poröses flächengebilde, filterelement, verfahren zu ihrer herstellung und ihre verwendung |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10255701A1 (de) * | 2002-11-29 | 2004-06-17 | Mann + Hummel Gmbh | Flüssigkeitsfilterelement |
BR122017021975B1 (pt) * | 2004-03-04 | 2019-04-24 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Método para a comutação de modo de um terminal de comunicação móvel multibanda multimodo |
KR100822444B1 (ko) * | 2007-06-26 | 2008-04-16 | 에이네스트(주) | 분리막과 분리막 모듈 프레임의 접착 구조가 개선된 분리막모듈 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3240143A1 (de) * | 1982-10-29 | 1984-05-03 | Akzo Gmbh, 5600 Wuppertal | Verfahren zum einbetten von membranen in ein thermoplastisches material |
US4890444A (en) * | 1986-02-13 | 1990-01-02 | H. B. Fuller Company | Bonded fluted filter media to end cap |
US5556440A (en) * | 1994-10-20 | 1996-09-17 | Fleetguard, Inc. | Pressure-actuated radial air filter seal |
DE29620189U1 (de) * | 1995-11-25 | 1997-01-23 | Sartorius Gmbh | Auf Integrität testbare Filtrationseinheit mit hydrophilen, porösen Membranen |
WO1999012629A1 (en) * | 1997-09-08 | 1999-03-18 | Cuno, Incorporated | End-cap for pleated filter cartridge |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3457339A (en) * | 1965-12-08 | 1969-07-22 | Pall Corp | Process for making end capped filter elements |
WO1983004186A1 (en) * | 1982-05-28 | 1983-12-08 | Amf Incorporated | Filter element having microporous filter membrane |
DE4339810C1 (de) * | 1993-11-23 | 1994-12-08 | Seitz Filter Werke | Verfahren zur partiellen Modifizierung von porösen, hydrophilen Filtermembranen, nachbehandelte Filtermembranen und mit ihnen bestückte Filtrationsmodule, insbesondere Filterkerzen |
JP3077020B2 (ja) * | 1996-04-25 | 2000-08-14 | 株式会社キッツ | 中空糸型分離膜モジュール |
-
1998
- 1998-07-21 DE DE19832658A patent/DE19832658C1/de not_active Expired - Fee Related
-
1999
- 1999-07-03 KR KR1020017000741A patent/KR20010074723A/ko not_active Application Discontinuation
- 1999-07-03 WO PCT/EP1999/004637 patent/WO2000004984A1/de not_active Application Discontinuation
- 1999-07-03 EP EP99936476A patent/EP1105206A1/de not_active Withdrawn
- 1999-07-03 AU AU51563/99A patent/AU5156399A/en not_active Abandoned
- 1999-07-03 JP JP2000560970A patent/JP2002521174A/ja active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3240143A1 (de) * | 1982-10-29 | 1984-05-03 | Akzo Gmbh, 5600 Wuppertal | Verfahren zum einbetten von membranen in ein thermoplastisches material |
US4890444A (en) * | 1986-02-13 | 1990-01-02 | H. B. Fuller Company | Bonded fluted filter media to end cap |
US5556440A (en) * | 1994-10-20 | 1996-09-17 | Fleetguard, Inc. | Pressure-actuated radial air filter seal |
DE29620189U1 (de) * | 1995-11-25 | 1997-01-23 | Sartorius Gmbh | Auf Integrität testbare Filtrationseinheit mit hydrophilen, porösen Membranen |
WO1999012629A1 (en) * | 1997-09-08 | 1999-03-18 | Cuno, Incorporated | End-cap for pleated filter cartridge |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150041386A1 (en) * | 2012-04-27 | 2015-02-12 | Sartorius Stedim Biotech Gmbh | Filter element with improved testability after dry steaming |
US11020689B2 (en) | 2012-04-27 | 2021-06-01 | Sartorius Stedim Biotech Gmbh | Filter element with improved testability after dry steaming |
WO2018077476A1 (de) * | 2016-10-31 | 2018-05-03 | Sartorius Stedim Biotech Gmbh | Poröses flächengebilde, filterelement, verfahren zu ihrer herstellung und ihre verwendung |
US11198099B2 (en) | 2016-10-31 | 2021-12-14 | Sartorius Stedim Biotech Gmbh | Porous textile fabric, filter element, method for the production thereof and use thereof |
Also Published As
Publication number | Publication date |
---|---|
EP1105206A1 (de) | 2001-06-13 |
AU5156399A (en) | 2000-02-14 |
JP2002521174A (ja) | 2002-07-16 |
KR20010074723A (ko) | 2001-08-09 |
DE19832658C1 (de) | 1999-11-11 |
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