GB2048109A - Forming end seals on pleated paper filter elements - Google Patents
Forming end seals on pleated paper filter elements Download PDFInfo
- Publication number
- GB2048109A GB2048109A GB7916177A GB7916177A GB2048109A GB 2048109 A GB2048109 A GB 2048109A GB 7916177 A GB7916177 A GB 7916177A GB 7916177 A GB7916177 A GB 7916177A GB 2048109 A GB2048109 A GB 2048109A
- Authority
- GB
- United Kingdom
- Prior art keywords
- paste
- mould
- pleats
- end seals
- bead
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000009974 thixotropic effect Effects 0.000 claims abstract description 8
- 239000013536 elastomeric material Substances 0.000 claims abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 5
- 239000011347 resin Substances 0.000 claims abstract description 5
- 239000006260 foam Substances 0.000 claims abstract description 3
- 239000011324 bead Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 8
- 239000004800 polyvinyl chloride Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- 239000000057 synthetic resin Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 3
- 229920002554 vinyl polymer Polymers 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/111—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
- B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/12—Pleated filters
- B01D2201/127—Pleated filters with means for keeping the spacing between the pleats
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/34—Seals or gaskets for filtering elements
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Filtering Materials (AREA)
Abstract
End seals on the opposite ends of a pleated annular paper filter element are formed by applying a thixotropic heat foamable paste of polyvinyl elastomeric material to depressions 14 in two mould plates 10 which are then applied to the opposite ends of the element, the assembly of the plates and element then being subjected to heat to foam and cure the elastomeric material (and resin with which the paper is impregnated) in a single operation, the thixotropic property of the material retaining it in the upper plate when applied to the element. <IMAGE>
Description
SPECIFICATION
Forming end seals on pleated paper filter elements
This invention relates to the manufacture of synthetic resin impregnated pleated paper filter elements, of hollow tubular form, and in to the provision on such elements of end seals or gaskets on the opposite ends thereof.
The invention is applicable in particular to the manufacture of elements of the aforesaid kind for use as air filter elements; and the invention is suitable in particular for the manufacture of such air filter elements in which the ends of the pleats are individually sealed.
In a method of manufacturing synthetic resin impregnated pleated paper filter elements, of hollow tubular form, according to the present invention, end seals are secured to the opposite ends of the element by: applying a continuous bead of thixotropic heat-foamable paste of polymeric elastomeric material to a continuous depression in each of two mould plates formed with peripheral walls to retain the element in the desired tubular form, the amount of applied paste being sufficient for the bead to project above the adjacent surface of the mould plate therearound; placing one end of the element in one mould plate and inverting the other mould plate and placing it on the other end of the element, so that the projecting portion of the bead on each mould plate is forced into sealing contact with the ends of the pleats at each end of the element; heating the assembled mould plates and element to foam and cure the polymeric elastomeric paste; and finally removing the mould plates from the ends of the element.
The operation of heating the assembled mould plates and element may also effect the curing of the resin in the paper element. A preferred polymeric elastomeric material is a polyvinyl chloride paste.
Preferably, the filter element is an air filter element with the ends of the pleats individually sealed, the said end seals being secured to the inner peripheries of opposite ends of the element.
A preferred embodiment of the invention, and the method for its manufacture and the means employed for its manufacture are hereinafter described with reference to the accompanying drawings in which:
Figure 1 is a plan of an air filter element made in accordance with the present invention;
Figure 2 is a view showing on the left hand side a section and on the right hand side an elevation of the element shown in Figure 1;
Figure 3 is an enlarged detail of Figure 2, showing an end of a pleat and the seal applied thereto; and
Figure 4 is a section of one half of a mould plate used in the manufacture of filter elements in accordance with the invention.
Figures 1 to 3 show an air filter element 1 made in accordance with the present invention.
The element is formed of synthetic resin impregnated paper folded in zig-zag fashion about regularly spaced fold lines to form a series of pleats 2 spaced from each other by spacer dimples or like formations 3. The ends of the pleats are individually sealed by adhesive applied to the longitudinal edge portions of one side of the strip of filter paper from which the pleated
element is made. Such elements are disclosed in our prior patent No. 880 812.
Adjacent the inner periphery of the element, opposite ends thereof have secured thereon end seals or gaskets 5 made from heat foamable thixotrophic polyvinyl chloride paste, the gasket 5 projecting beyond the ends of the element pleats, as shown in Figure 2, and over-lapping the ends of the pleats at the inner periphery of the element as shown at 6. In order to form the end seals 5 use is
made of a pair of mould plates 10, as shown in
Figure 4. The mould plates 10 are conveniently formed as circular pressings from sheet metal, each plate having an outer peripheral wall 11
adjacent a flat annular portion 12, the width of which is somewhat less than the width of the pleats of the element, and, adjacent the inner periphery portion of the flat annular portion 12 an annular groove 14 the depth of which is such as to provide the desired height of the end seals on the filter element 1.The inner wall 15 of the groove 14 extends upwardly from the groove 14 to above the level of the flat portion 12 to a height somewhat more than the height of the desired end seals.
In order to form the end seals 5 on the element
1 shown in Figure 2, two such mould plates each have deposited in the annular groove 14 thereof a bead of heat foamable thixotropic polyvinyl chloride paste, the amount of the deposited paste being such as to fill the groove and project with a convex surface above the level of the flat portion
12 of the mould plate, as shown at 16 in Figure 4.
The previously pleated strip of sheet filter material, with the ends of the strip joined together but with the resin with which it is impregnated still in its uncured state, is then placed on one of the moulds 10, the annular wall 1 1 ensuring that the series of pleats are maintained in annular form.
The one end of the series of pleats engages the convex bead of polyvinyl chloride paste and the downward pressure exerted thereon causes the paste to be forced upwardly between the ends of the pleats at the inner periphery of the assembly and for some of the paste to be forced upwardly against the substantially vertical wall of the central raised portion of the mould plate, so as to overlap the pleat ends at the inner periphery of the assembly of pleats.
The other mould plate, with a similarly applied bead of heat fomable thixotropic polyvinyl paste is then inverted and placed on top of the upper end of the assembly of pleats in the first mould, the thixotropic properties of the paste ensuring that it will not drip from the inverted mould plate and that it will retain its convex projecting surface before the insertion of the assembly of pleats 2 therein.
The plates 10 with the assembly of pleats 2 therebetween are then passed through a curing oven during which the the heat not only cures the resin with which the filter paper is impregnated but also effects the foaming and curing of the polyvinyl chloride paste. After the conclusion of the heat operation the mould plates are removed from the completed filter element and are then returned for use with further assemblies of pleats.
It is found that the cured polyvinyl chloride material separates readily from the mould plate and that the latter do not need to be coated with a release agent.
A suitable heat foamable thixotropic polyvinyl chloride paste is manufactured by Vinatex Ltd.
under their reference PFP/40/79/203 WHITE 750D.
Claims (4)
1. A method of manufacturing synthetic resin
impregnated pleated paper filter elements, of
hollow tubular form, in which end seals are secured to opposite ends of the element by: applying a continuous bead of thixotropic heatfoamable paste of polymeric elastomeric material to a continuous depression in each of two mould
plates formed with peripheral walls to retain the element in the desired tubular form, the amount of applied paste being sufficient for the bead to project above the adjacent surface of the plate therearound; placing one end of the element in one mould plate and inverting the other mould plate and placing it on the other end of the element, so that the projecting portion of the bead on each mould plate is forced into sealing contact with the ends of the pleats at each end of the element; heating the assembled mould plates and element to foam and cure the polymeric elastomeric paste; and finally removing the mould plates from the ends of the element.
2. A method according to claim 1, in which the heating of the assembled mould plates and element also effects the curing of the resin in the paper element
3. A method according to claim 1 or 2, in which said polymeric elastomeric material is a polyvinyl chloride paste.
4. A method according to any of claims 1 to 3, in which said filter element is an air filter element with the ends of the pleats individually sealed, and said end seals are secured to the inner peripheries of opposite ends of the element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7916177A GB2048109B (en) | 1979-05-10 | 1979-05-10 | Forming end seals on pleated paper filter elements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7916177A GB2048109B (en) | 1979-05-10 | 1979-05-10 | Forming end seals on pleated paper filter elements |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2048109A true GB2048109A (en) | 1980-12-10 |
| GB2048109B GB2048109B (en) | 1983-04-20 |
Family
ID=10505056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7916177A Expired GB2048109B (en) | 1979-05-10 | 1979-05-10 | Forming end seals on pleated paper filter elements |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2048109B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4498989A (en) * | 1981-02-23 | 1985-02-12 | Nippondenso Co., Ltd. | Fluid filter element and support |
| US4725323A (en) * | 1985-05-22 | 1988-02-16 | Cuno Incorporated | Filter element |
| US4731184A (en) * | 1985-05-22 | 1988-03-15 | Cuno Incorporated | Filter element |
| US5015316A (en) * | 1985-05-22 | 1991-05-14 | Cuno, Incorporated | Filter element |
| US5028327A (en) * | 1985-05-22 | 1991-07-02 | Cuno, Incorporated | Filter element |
| WO1994011083A1 (en) * | 1992-11-10 | 1994-05-26 | Allied-Signal Inc. | Filter and method for manufacturing filters |
| US5399264A (en) * | 1993-03-22 | 1995-03-21 | Cuno, Incorporated | Compressible differential pressure energized seals for filter elements and the like |
| US6585894B1 (en) * | 1998-03-26 | 2003-07-01 | Mahle Filtersysteme Gmbh | Ring-shaped filter element including an annular end plate and a foamed elastic sealing ring |
| EP2027904A2 (en) * | 2007-07-24 | 2009-02-25 | Mann+Hummel Gmbh | Filter element with seal and method for producing said filter element |
-
1979
- 1979-05-10 GB GB7916177A patent/GB2048109B/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4498989A (en) * | 1981-02-23 | 1985-02-12 | Nippondenso Co., Ltd. | Fluid filter element and support |
| US4725323A (en) * | 1985-05-22 | 1988-02-16 | Cuno Incorporated | Filter element |
| US4731184A (en) * | 1985-05-22 | 1988-03-15 | Cuno Incorporated | Filter element |
| US5015316A (en) * | 1985-05-22 | 1991-05-14 | Cuno, Incorporated | Filter element |
| US5028327A (en) * | 1985-05-22 | 1991-07-02 | Cuno, Incorporated | Filter element |
| WO1994011083A1 (en) * | 1992-11-10 | 1994-05-26 | Allied-Signal Inc. | Filter and method for manufacturing filters |
| US5399264A (en) * | 1993-03-22 | 1995-03-21 | Cuno, Incorporated | Compressible differential pressure energized seals for filter elements and the like |
| US6585894B1 (en) * | 1998-03-26 | 2003-07-01 | Mahle Filtersysteme Gmbh | Ring-shaped filter element including an annular end plate and a foamed elastic sealing ring |
| EP2027904A2 (en) * | 2007-07-24 | 2009-02-25 | Mann+Hummel Gmbh | Filter element with seal and method for producing said filter element |
| US8216496B2 (en) * | 2007-07-24 | 2012-07-10 | Mann + Hummel Gmbh | Filter element with sealing and method of producing the filter element |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2048109B (en) | 1983-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4227953A (en) | Method of fabricating air filters | |
| US4128251A (en) | Sealing gasket for air filter | |
| CN109069969B (en) | Panel filter with molded frame and integral seal | |
| DE69823856T2 (en) | STATIC SEAL | |
| US5589016A (en) | Prescored foam for panel fabrication | |
| GB2048109A (en) | Forming end seals on pleated paper filter elements | |
| US4151696A (en) | Framed window panels | |
| DE2137309C3 (en) | Filter with a pleated block made of a zigzag folded filter paper strip impregnated with thermoplastic synthetic resin | |
| US2781554A (en) | Method and apparatus for making tile panels | |
| DE2417551B2 (en) | Filter element | |
| US3013667A (en) | Plastic combining elements | |
| US3389031A (en) | Method of manufacturing pleated filters | |
| US3323963A (en) | Method of making filter coil | |
| DE2149414A1 (en) | Vacuum packaging process and device suitable for it | |
| WO1994022549A1 (en) | Filter cartridge and process for its manufacture | |
| US6561089B1 (en) | Screen assembly having border construction with cupping features and method of making | |
| JP2705834B2 (en) | Gasket product and manufacturing method thereof | |
| DE3207376A1 (en) | METHOD FOR COATING A RIGID OBJECT WITH A HEAT-RESISTANT COATING SHEET AND APPLICATION OF THIS METHOD FOR COATING A RIGID OBJECT IN THE AREA OF TWO BUTTLY CONNECTED EDGES | |
| DE3344187A1 (en) | FILTERING MEMBRANE WITH SEALING AND METHOD FOR THEIR PRODUCTION | |
| US4077389A (en) | Pneumatic oven door gasket | |
| DE69822736T2 (en) | High pressure seal | |
| US4118261A (en) | Method for reinforcing sheet material | |
| WO1999026711A1 (en) | Filter with form-retaining stabilizing means | |
| KR19990044417A (en) | Filter assembly manufacturing method and filter assembly produced thereby | |
| US3630382A (en) | Liquid filter cartridge and a method and apparatus for making the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19990509 |