US20070050978A1 - Method for manufacturing of a metallic sleeve - Google Patents

Method for manufacturing of a metallic sleeve Download PDF

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Publication number
US20070050978A1
US20070050978A1 US11/501,794 US50179406A US2007050978A1 US 20070050978 A1 US20070050978 A1 US 20070050978A1 US 50179406 A US50179406 A US 50179406A US 2007050978 A1 US2007050978 A1 US 2007050978A1
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United States
Prior art keywords
sleeve
core
mat
monolith
metallic
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Abandoned
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US11/501,794
Inventor
Haldor Topsoe
Jesper Norsk
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Topsoe AS
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Individual
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Assigned to HALDOR TOPSOE A/S reassignment HALDOR TOPSOE A/S ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NORSK, JESPER, TOPSOE, HALDOR F.A.
Publication of US20070050978A1 publication Critical patent/US20070050978A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/122—Making tubes or metal hoses with helically arranged seams with welded or soldered seams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/02—Fitting monolithic blocks into the housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
    • F01N3/2857—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing the mats or gaskets being at least partially made of intumescent material, e.g. unexpanded vermiculite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49345—Catalytic device making

Definitions

  • the invention relates to a method for preparation of a sleeve tightly encompassing a core.
  • the invention is specifically directed to production of a sleeve surrounding a catalytic filter.
  • Such sleeve and filter are particularly useful for cleaning exhaust gas from diesel engines in vehicles and vessels.
  • US Patent Application No. 2004/0155293 discloses a perforated sleeve, which is formed by winding a perforated metal strip in helical turns. This is used for filters, where the fluid flows through the perforated wall of the sleeve.
  • a double wall pipe is described in U.S. Pat. No. 4,823,847 and is also wound helically. To obtain a precise size of outer diameter, the pipe is mechanically expanded by inserting press shoes inside the pipe.
  • Another filter is made from many layers of perforated strips wound helically as described in US Patent Application No. 2004/0004110.
  • the invention provides a method for preparation of a metallic sleeve surrounding a core comprising the steps of helically winding a metallic strip and helically welding the strip forming the sleeve, inserting the core in the sleeve, coaxially encompassing the sleeve with a plurality of movable segments and exposing the sleeve to pressure force by pressing the segments against outer surface of the sleeve until a preset dimension of the sleeve is obtained.
  • the invention further provides a method for preparation of a metallic sleeve encompassing a core, which is a monolith surrounded by an intumescent mat.
  • the invention even further provides a method for preparation of a metallic sleeve, where the monolith is a catalysed filter or a catalytic converter and the mat is made from a fibrous material preferably comprising vermiculite. This is useful for installation in a pipe with exhaust from a diesel engine.
  • the invention even further provides a metallic sleeve with a core prepared according to the preparation method.
  • the sleeve of the invention makes it possible for a gas to flow through an inserted porous body without by-passing the body.
  • FIG. 1 is a sketch of a sleeve according to the invention.
  • FIG. 2 is a cross section of a sleeve according to the invention.
  • FIG. 3 is a sketch of a sleeve according to prior art showing related forces during preparation.
  • FIG. 4 is a sketch of a sleeve according to the invention showing related forces during preparation.
  • a filter or converter comprising a monolith surrounded by a sleeve gap between the monolith and the sleeve must be avoided in order to ensure that no fluid by-passes the monolith and often the gap must be avoided in a very wide temperature range.
  • the sleeve typically is made from metal and the monolith from a ceramic material, which means that the thermal expansion of the sleeve is higher than the thermal expansion of the monolith.
  • a mat is inserted between the sleeve and the monolith.
  • the material of the mat must be selected so that the mat expands again after having been considerably compressed even down to half thickness.
  • the monolith surrounded by the mat is inserted in the sleeve, and then the outer surface of the sleeve is exposed to pressurizing forces.
  • the material will during this pressurizing buckle at positions, where the properties deviate. Such deviations typically occur near a welding seam.
  • tubes with low thickness compared to their diameter are prepared from a square plate, which is rolled and welded. Outer pressure forces as the ones mentioned above acting on such a tube are orthogonal to the welding seam, which means that the material yields in a direction along the welding seam and orthogonal to the welding seam. This creates concentrated stresses. Further, the material has a high tendency to buckle, where deviations in material properties occur; these deviations are near the welding seam.
  • the welding will have a helical shape, which has the advantage that pressurizing this tube makes the material yield in a direction at an angel with the welding seam. In this case with helical welding buckling is avoided and smooth surfaces of the tube are obtained.
  • a long metal strip is helically wound and welded to form a channel typically a tube. This forms a sleeve.
  • a core is produced and the diameter or other relevant dimensions are measured with a high accuracy.
  • a mat is wound around the core and placed in a machine, which pushes the core and mat into the sleeve and transfers it to a pressurizing machine.
  • the sleeve is surrounded by a number of pressurizing segments, which form a cylinder with narrow, axial spaces between and by a length of at least 5% longer than the sleeve and with a diameter being larger than the diameter of the sleeve.
  • the pressurizing segments are pushed together by a surrounding conical device.
  • the movement of the segments are stopped when a specified diameter of the sleeve is obtained.
  • the thickness of the mat is reduced to approximately the half.
  • the pressurizing takes place at ambient temperature.
  • This method enables a pressurization without creating buckles of the sleeve, which otherwise would damage the core.
  • the core is a monolith, preferably a catalyzed, ceramic monolith and the mat is an intumescent mat, preferably containing vermiculite being particular useful as a diesel exhaust gas filter or converter, which are used at temperatures from ⁇ 30° C. to 500° C.
  • the sleeve expands more than the ceramic monolith when heated, but empty space is avoided as the intumescent mat expands widely. This ensures that all the exhaust gas passes the catalyst.
  • the filter has a length of 100-500 mm preferably 150-350 mm and a diameter of 100-450 mm preferably 150-350 mm.
  • the sleeve has a wall thickness of 1.0-2.5 mm preferably 1.25-2.00 mm and the thickness of the mat in the finished filter is 3-8 mm, preferably 4-6 mm.
  • the pressurization is performed by 6-10, preferably 8 segments.
  • FIG. 1 shows a sleeve 1 of the invention as a side view and with a helical welding seam 2 .
  • FIG. 2 shows the principles of pressurization during the preparation according to the invention.
  • the sleeve 1 with the welding seam 2 is surrounding a core 4 , and between the sleeve 1 and core 4 a mat 6 is placed.
  • the sleeve 1 is pressurized to a certain, fixed diameter by pressurizing segments 8 .
  • FIG. 3 shows a tube 11 , which has an axial welding seam 13 .
  • the direction 15 of the pressurizing forces is shown as well as the axial yield 17 . From this it is seen that the welding seam 13 has the same direction as the axial yield.
  • FIG. 4 shows the sleeve 1 of the invention with the helical welding seam 2 , where also the direction 15 of the pressurizing forces and of the axial yield 17 are shown. From this, it clearly appears that the direction of the welding seam 2 does not coincide with the direction of yield 17 and the stresses connected to it.
  • Cylindrical sleeves were produced from a square piece of metal by rolling and welding forming axial welding seams.
  • the sleeves were produced with a length from 150 mm to 350 mm, outer diameter from 150 mm to 350 mm and a wall thickness from 1.25 mm to 2.00 mm.
  • a sleeve and a monolith with an 8-10 mm thick mat wound around it were placed in a machine, which pushed the monolith into the sleeve.
  • the mat was an intumescent mat made from a fibre material containing 30-40% vermiculite, which can be pressed to half the thickness and then expands again when heated.
  • the sleeves were exposed to pressure forces on the entire outer surface by eight segments forming an outer cylinder with a little space between. The segments pressed against the outer surface of the sleeve until a preset diameter of the sleeve was obtained. The mats were pressed to a thickness of 4.4 mm.
  • the sleeves were buckled during the pressurization.
  • the buckle was in the heat affected zone of the welding seam, because of the low yield strength in this zone.
  • cylindrical sleeves were produced from a long metal strip, which was helically wound to cylinders.
  • the cylinders were welded forming sleeves with helical welding seams.
  • Sleeves, monoliths and mats had same dimensions as the sleeves mentioned above.
  • the pressurization force was 10 t, which pressurized the sleeves until the thickness of the mat was 4.4 mm.
  • the helically wound sleeve did not show buckles after pressuring.
  • the invention is useful for producing sleeves with circular, square, hexagonal, octagonal or other geometric cross-section, where the sleeve encompasses a core, where no slip between sleeve and core is allowed.
  • This is especially relevant for filters and converters, where the core is a filter material, which evidently must not be by-passed.
  • filters and catalytic converters are filters for cleaning diesel exhaust gas. These filters will comprise catalysed ceramic monoliths able to reduce NO x to N 2 and/or hold back soot particles in the exhaust gas.

Abstract

The invention provides a method for preparation of a metallic sleeve surrounding a core comprising the steps of rolling a metallic strip and helically welding the strip forming the sleeve, inserting the core in the sleeve, encompassing the sleeve with a plurality of movable segments and exposing the sleeve to pressure force by pressing the segments against outer surface of the sleeve until a preset dimension of the sleeve is obtained. The method is particularly useful when the core is a monolith encompassed by an intumescent mat, especially when the monolith is a catalysed filter and the mat is made from a fibrous material preferably containing vermiculite. The filter can be installed in a pipe with exhaust from a diesel engine.

Description

    BACKGROUND OF THE INVENTION
  • 1 Field of the Invention
  • The invention relates to a method for preparation of a sleeve tightly encompassing a core. The invention is specifically directed to production of a sleeve surrounding a catalytic filter. Such sleeve and filter are particularly useful for cleaning exhaust gas from diesel engines in vehicles and vessels.
  • 2 Description of Related Art
  • Numerous methods of manufacturing pipes, tubes and sleeves are already described in the technical literature.
  • US Patent Application No. 2004/0155293 discloses a perforated sleeve, which is formed by winding a perforated metal strip in helical turns. This is used for filters, where the fluid flows through the perforated wall of the sleeve.
  • A double wall pipe is described in U.S. Pat. No. 4,823,847 and is also wound helically. To obtain a precise size of outer diameter, the pipe is mechanically expanded by inserting press shoes inside the pipe.
  • Another filter is made from many layers of perforated strips wound helically as described in US Patent Application No. 2004/0004110.
  • Prior art describes helically wound tubes, where fluids flow through the tube wall, or where the size of the outer diameter has to be precise.
  • It is the object of the invention to find a method for producing a sleeve, which must tightly encompass a porous core to avoid any by-pass of the core, when a gas flows through the core in the sleeve.
    • SUMMARY OF THE INVENTION
  • Pursuant to the above object, the invention provides a method for preparation of a metallic sleeve surrounding a core comprising the steps of helically winding a metallic strip and helically welding the strip forming the sleeve, inserting the core in the sleeve, coaxially encompassing the sleeve with a plurality of movable segments and exposing the sleeve to pressure force by pressing the segments against outer surface of the sleeve until a preset dimension of the sleeve is obtained.
  • The invention further provides a method for preparation of a metallic sleeve encompassing a core, which is a monolith surrounded by an intumescent mat.
  • The invention even further provides a method for preparation of a metallic sleeve, where the monolith is a catalysed filter or a catalytic converter and the mat is made from a fibrous material preferably comprising vermiculite. This is useful for installation in a pipe with exhaust from a diesel engine.
  • The invention even further provides a metallic sleeve with a core prepared according to the preparation method.
  • The sleeve of the invention makes it possible for a gas to flow through an inserted porous body without by-passing the body.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a sketch of a sleeve according to the invention.
  • FIG. 2 is a cross section of a sleeve according to the invention.
  • FIG. 3 is a sketch of a sleeve according to prior art showing related forces during preparation.
  • FIG. 4 is a sketch of a sleeve according to the invention showing related forces during preparation.
    • DETAILED DESCRIPTION OF THE INVENTION
  • In a filter or converter comprising a monolith surrounded by a sleeve gap between the monolith and the sleeve must be avoided in order to ensure that no fluid by-passes the monolith and often the gap must be avoided in a very wide temperature range.
  • The sleeve typically is made from metal and the monolith from a ceramic material, which means that the thermal expansion of the sleeve is higher than the thermal expansion of the monolith.
  • To avoid a gap under these conditions, a mat is inserted between the sleeve and the monolith.
  • The material of the mat must be selected so that the mat expands again after having been considerably compressed even down to half thickness.
  • During preparation of the filter, the monolith surrounded by the mat is inserted in the sleeve, and then the outer surface of the sleeve is exposed to pressurizing forces.
  • This results in that the material of the sleeve yields axially in tension and circumferentially in compression direction.
  • If the properties of the sleeve such as thickness, yield strength and similar are not exactly the same along the entire sleeve, the material will during this pressurizing buckle at positions, where the properties deviate. Such deviations typically occur near a welding seam.
  • Usually tubes with low thickness compared to their diameter are prepared from a square plate, which is rolled and welded. Outer pressure forces as the ones mentioned above acting on such a tube are orthogonal to the welding seam, which means that the material yields in a direction along the welding seam and orthogonal to the welding seam. This creates concentrated stresses. Further, the material has a high tendency to buckle, where deviations in material properties occur; these deviations are near the welding seam.
  • When a sleeve is manufactured according to the invention by helically winding a long strip and then welding, the welding will have a helical shape, which has the advantage that pressurizing this tube makes the material yield in a direction at an angel with the welding seam. In this case with helical welding buckling is avoided and smooth surfaces of the tube are obtained.
  • A long metal strip is helically wound and welded to form a channel typically a tube. This forms a sleeve.
  • A core is produced and the diameter or other relevant dimensions are measured with a high accuracy. A mat is wound around the core and placed in a machine, which pushes the core and mat into the sleeve and transfers it to a pressurizing machine.
  • In this pressurizing machine the sleeve is surrounded by a number of pressurizing segments, which form a cylinder with narrow, axial spaces between and by a length of at least 5% longer than the sleeve and with a diameter being larger than the diameter of the sleeve.
  • The pressurizing segments are pushed together by a surrounding conical device. The movement of the segments are stopped when a specified diameter of the sleeve is obtained. During the pressurizing the thickness of the mat is reduced to approximately the half. The pressurizing takes place at ambient temperature.
  • This method enables a pressurization without creating buckles of the sleeve, which otherwise would damage the core.
  • In one embodiment of the invention, the core is a monolith, preferably a catalyzed, ceramic monolith and the mat is an intumescent mat, preferably containing vermiculite being particular useful as a diesel exhaust gas filter or converter, which are used at temperatures from −30° C. to 500° C. The sleeve expands more than the ceramic monolith when heated, but empty space is avoided as the intumescent mat expands widely. This ensures that all the exhaust gas passes the catalyst.
  • The filter has a length of 100-500 mm preferably 150-350 mm and a diameter of 100-450 mm preferably 150-350 mm. The sleeve has a wall thickness of 1.0-2.5 mm preferably 1.25-2.00 mm and the thickness of the mat in the finished filter is 3-8 mm, preferably 4-6 mm.
  • The pressurization is performed by 6-10, preferably 8 segments.
  • The invention is further illustrated in the drawings, where FIG. 1 shows a sleeve 1 of the invention as a side view and with a helical welding seam 2.
  • FIG. 2 shows the principles of pressurization during the preparation according to the invention. The sleeve 1 with the welding seam 2 is surrounding a core 4, and between the sleeve 1 and core 4 a mat 6 is placed. The sleeve 1 is pressurized to a certain, fixed diameter by pressurizing segments 8.
  • FIG. 3 shows a tube 11, which has an axial welding seam 13. The direction 15 of the pressurizing forces is shown as well as the axial yield 17. From this it is seen that the welding seam 13 has the same direction as the axial yield.
  • FIG. 4 shows the sleeve 1 of the invention with the helical welding seam 2, where also the direction 15 of the pressurizing forces and of the axial yield 17 are shown. From this, it clearly appears that the direction of the welding seam 2 does not coincide with the direction of yield 17 and the stresses connected to it.
    • COMPARISON EXAMPLE
  • Cylindrical sleeves were produced from a square piece of metal by rolling and welding forming axial welding seams.
  • The sleeves were produced with a length from 150 mm to 350 mm, outer diameter from 150 mm to 350 mm and a wall thickness from 1.25 mm to 2.00 mm.
  • A sleeve and a monolith with an 8-10 mm thick mat wound around it were placed in a machine, which pushed the monolith into the sleeve.
  • The mat was an intumescent mat made from a fibre material containing 30-40% vermiculite, which can be pressed to half the thickness and then expands again when heated.
  • The sleeves were exposed to pressure forces on the entire outer surface by eight segments forming an outer cylinder with a little space between. The segments pressed against the outer surface of the sleeve until a preset diameter of the sleeve was obtained. The mats were pressed to a thickness of 4.4 mm.
  • During pressurizing the length of the sleeve increased 1-1.5% and the wall thickness increased 1%.
  • Some of the sleeves were buckled during the pressurization. The sleeve buckled 10-20 mm in an inward direction in the entire length of the sleeve. The buckle was in the heat affected zone of the welding seam, because of the low yield strength in this zone.
  • Then cylindrical sleeves were produced from a long metal strip, which was helically wound to cylinders. The cylinders were welded forming sleeves with helical welding seams. Sleeves, monoliths and mats had same dimensions as the sleeves mentioned above.
  • Monoliths with mats were inserted in the sleeves, and the sleeves were pressurized in the same way as described above.
  • The pressurization force was 10 t, which pressurized the sleeves until the thickness of the mat was 4.4 mm.
  • The helically wound sleeve did not show buckles after pressuring.
  • The invention is useful for producing sleeves with circular, square, hexagonal, octagonal or other geometric cross-section, where the sleeve encompasses a core, where no slip between sleeve and core is allowed. This is especially relevant for filters and converters, where the core is a filter material, which evidently must not be by-passed. Examples of such filters and catalytic converters are filters for cleaning diesel exhaust gas. These filters will comprise catalysed ceramic monoliths able to reduce NOx to N2 and/or hold back soot particles in the exhaust gas.
  • These filters are suitable for installation in vans, trucks, vessels, diesel locomotives and similar.

Claims (7)

1. Method for preparation of a metallic sleeve surrounding a core, comprising the steps of
a. Helically winding a metallic strip and helically welding the strip forming the sleeve;
b. inserting the core in the sleeve;
c. coaxially encompassing the sleeve with a plurality of movable segments; and
d. exposing the sleeve to pressure force by pressing the segments against outer surface of the sleeve until a preset dimension of the sleeve is obtained.
2. Method according to claim 1, wherein the core is a monolith encompassed by an intumescent mat.
3. Method according to claim 2, wherein the monolith is a catalysed filter and the mat is made from a fibrous material.
4. Method according to claim 3, wherein the fibrous material contains vermiculite.
5. A metallic sleeve with a core prepared according to claim 1.
6. A metallic sleeve with a cylindrical core according to claim 5, wherein the length of the sleeve is 100-500 mm preferably 150-350 mm, the outer diameter of the sleeve is 100-450 mm preferably 150-350 mm, wall thickness of the sleeve is 1.0-2.5 mm, preferably 1.25-2.00 mm, and the thickness of the mat is 3-8 mm, preferably 4-6 mm.
7. A catalysed filter being sleeved with a sleeve in accordance with claim 1.
US11/501,794 2005-09-06 2006-08-10 Method for manufacturing of a metallic sleeve Abandoned US20070050978A1 (en)

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DKPA200501238 2005-09-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2930463A1 (en) * 2008-04-25 2009-10-30 Faurecia Sys Echappement Metal tube manufacturing device for exhaust line of motor vehicle, has forming units winding metallic strip with helical angle with respect to central axis, where helical angle is between specific ranges of values in degrees
CN104826410A (en) * 2015-04-15 2015-08-12 成都易态科技有限公司 Flue gas filtering element and making method thereof
US20170232502A1 (en) * 2009-07-30 2017-08-17 Gws Tube Forming Solutions Inc. Apparatus and method for forming an antipollution device housing

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4269807A (en) * 1979-10-22 1981-05-26 Uop Inc. Catalytic converter mounting arrangement for reducing bypass leakage
US4598063A (en) * 1985-08-09 1986-07-01 Retallick William B Spiral catalyst support and method of making it
US4782661A (en) * 1987-02-13 1988-11-08 General Motors Corporation Mat support/substrate subassembly and method of making a catalytic converter therewith
US4823847A (en) * 1981-09-11 1989-04-25 Hoesch Werke Ag Multi-layer helical seam steel pipe
US4838067A (en) * 1987-05-18 1989-06-13 W. R. Grace & Co.-Conn. Corrosion resistant corrugated metal foil for use in wound and folded honeycomb cores
US5252299A (en) * 1992-05-28 1993-10-12 Retallick William B Catalytic air cleaner
US5943771A (en) * 1997-02-03 1999-08-31 Corning Incorporated Method of making a catalytic converter for use in an internal combustion engine
US20030155293A1 (en) * 2002-02-21 2003-08-21 Mcgrath James A. Square-holed spiral welded filter element support sleeve
US20040004110A1 (en) * 2002-07-03 2004-01-08 Tubular Perforating Mfg., Ltd. Filter cartridge assembly and method of manufacture
US20040155293A1 (en) * 2002-04-26 2004-08-12 Kei-Kang Hung Semiconductor device with ESD protection

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4269807A (en) * 1979-10-22 1981-05-26 Uop Inc. Catalytic converter mounting arrangement for reducing bypass leakage
US4823847A (en) * 1981-09-11 1989-04-25 Hoesch Werke Ag Multi-layer helical seam steel pipe
US4598063A (en) * 1985-08-09 1986-07-01 Retallick William B Spiral catalyst support and method of making it
US4782661A (en) * 1987-02-13 1988-11-08 General Motors Corporation Mat support/substrate subassembly and method of making a catalytic converter therewith
US4838067A (en) * 1987-05-18 1989-06-13 W. R. Grace & Co.-Conn. Corrosion resistant corrugated metal foil for use in wound and folded honeycomb cores
US5252299A (en) * 1992-05-28 1993-10-12 Retallick William B Catalytic air cleaner
US5943771A (en) * 1997-02-03 1999-08-31 Corning Incorporated Method of making a catalytic converter for use in an internal combustion engine
US20030155293A1 (en) * 2002-02-21 2003-08-21 Mcgrath James A. Square-holed spiral welded filter element support sleeve
US20040155293A1 (en) * 2002-04-26 2004-08-12 Kei-Kang Hung Semiconductor device with ESD protection
US20040004110A1 (en) * 2002-07-03 2004-01-08 Tubular Perforating Mfg., Ltd. Filter cartridge assembly and method of manufacture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2930463A1 (en) * 2008-04-25 2009-10-30 Faurecia Sys Echappement Metal tube manufacturing device for exhaust line of motor vehicle, has forming units winding metallic strip with helical angle with respect to central axis, where helical angle is between specific ranges of values in degrees
US20170232502A1 (en) * 2009-07-30 2017-08-17 Gws Tube Forming Solutions Inc. Apparatus and method for forming an antipollution device housing
US10589343B2 (en) * 2009-07-30 2020-03-17 Gws Tube Forming Solutions Inc. Apparatus and method for forming an antipollution device housing
CN104826410A (en) * 2015-04-15 2015-08-12 成都易态科技有限公司 Flue gas filtering element and making method thereof

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