US3708848A - Method of manufacturing filter elements - Google Patents

Method of manufacturing filter elements Download PDF

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Publication number
US3708848A
US3708848A US00092690A US3708848DA US3708848A US 3708848 A US3708848 A US 3708848A US 00092690 A US00092690 A US 00092690A US 3708848D A US3708848D A US 3708848DA US 3708848 A US3708848 A US 3708848A
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United States
Prior art keywords
slots
swaging
filter
electrolysis
section
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Expired - Lifetime
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US00092690A
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English (en)
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P Guinard
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/02—Stabbing or piercing, e.g. for making sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/10—Filter screens essentially made of metal
    • 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
    • Y10T29/496—Multiperforated metal article making
    • Y10T29/49604—Filter

Definitions

  • This invention relates to filter strips containing rows of slots of generaloblong or rectangular form, from which strips filters of generally frusto-conical or cylindrical form may be made.
  • Such filter strips may be made by punching a metallic strip or formed directly by electrodeposition, the rows of slots then being subjected to a swaging (i.e. pressure) operation with the help of a swaging tool so as to reduce the depth and width of the slots while forming, between said slots, linear projections on atleast one of the faces of the strip according to applicants prior US. Pat. No. 3,520,418.
  • the cross-section of the slots To obtain well calibrated slots which, during a filtering or draining operation, permit solid particles of predetermined sizes to pass through the filter without these particles blocking said slots, it is'desirable for the cross-section of the slots to include a short portion having substantially parallel walls which then diverge in the direction of flow to form a wide opening.
  • This configuration having a funnel-shaped cross-section, is obtained prior to swaging, either during the punching operation by using punches having the desired crosssection-, or after punching, by any appropriate means such as sand-blasting.
  • the present invention is more particularly concerned with the use of a swaging operation for reducing the width of the slots in the case of filter plates having parallel rows of slots and made by an electrolytic method, particularly such a method employing nickel.
  • This method comprises coating a zinc plate with a lightsensitive electrically insulating coa n e.g. a varnish, in forming on the layer of varnish a negative image of the slotted plate that it isdesired toobtain, the zones exposed to the light becoming insoluble, and in removing the unaffected zones of the coating of varnishby swilling with water.
  • the face of the zinc plate that then has insulating zones occupying the positions at which it is desired to formthe slots of the filter, is then covered with a coating of electrically conducting material (e.g. a varnish) and then covered with nickel by electrolysis in a nickel-salt bathin which the plate is immersed, the zinc plate forming the cathode and the nickel being deposited over the entire surface except for the zones covered by theinsulating varnish and corresponding to the slots.
  • the slotted nickel foil thus obtained is then detached from the layer of electrically conducting varnish.
  • the nickel foil thus obtained has, between the slots, a curved cross-section of general semi-circular form (as can be seen in FIG. 1 above line X-X), so that the slots have the required divergent form.
  • the nickel foil itis possible to increase the thickness of the nickel foil by a second operation of electrolysis by depositing nickel on its. second planar face, that was attached to the electrically conducting varnish during the first operation of electrolysis, the nickel foilitself constituting the cathode in this second operation.
  • the cross-section of the slots thereby acquires the general form of a cotton reel or a double funnel because of the curved form of the nickel deposit between the slots, and the swaging operation on the rows of slots does not then make it possible to obtain slots having a cross-section in the form of a short inlet portion with substantially parallel walls on one side of the strip which then diverges abruptly towards the outlet in the direction of flow in the form of a single funnel on the other side of the strip.
  • the present invention enables these drawbacks to be substantially obviated and is mainly characterized in that the filter strip is obtained by a first complete operation of electrolysis which, after the strip has been turned round, is followed by a second partial operation of electrolysis or vice versa, so that-the cross-sections between the slots provide a general semi-circular form on the first side and a similar but much flattened form on the second side, these operations of electrolysis being followed by swaging of the rows of slots so as substantially to impart to them the required single-funnel form and to form linear projections on at least one of the faces of the strips between the rows of slots.
  • this swaging operation involves the use of a backing plate or die having at least one projecting portion between the slots in the strip, so as to facilitate the formation of a substantially parallelwalled section having relatively sharp edges preceding the divergent portion of each slot.
  • This modified form employing a backing plate or die havingprojecting portions can be used also when the perforated strips are formed by punching.
  • the projecting portions on the backing plate or die fon'n burrs at the marginal portions of the'slots, which burrs can, if not required, for a particular application, be removed for example by buffing.
  • FIG. 1 is a cross-section on a very large scale through a filter strip obtained by electrolysis in accordance with FIG. 2 is a view corresponding to the FIG. 1, but
  • FIG. 3 is a plan view of the strip shown in FIG. 2,
  • FIG. 4 is a cross-section on the line IV-IV of FIG. 3, I
  • FIG. 5 corresponds to FIG. 3, but shows the result of using a swaging arrangement employing a backing plate or die having projecting portions.
  • the filter strip 1, shown in FIG. 1 is produced by electrolysis in two successive operations. A first complete operation of electrolysis as described above enables the portion of the strip located above the line X-X to be obtained. After the strip has beenturned round, a second electrolysis operation is carried out as already described, but in accordance with the invention this is arrested before its final stage, which enables the strip to be completed by addition of the portion below the line X-X.
  • the slots 2 have enlarged shapes 2A and 2B, but the portion 2B, located below the line X-X and corresponding to the incomplete operation of electrolysis, is much less accentuated.
  • the two different degrees of electrolytic deposition can be carried out in the opposite order.
  • this smaller widened portion 23 is practically eliminated so that it has substantially parallel walls as seen in particular in FIG. 2.
  • the swaging operation in which a swaging tool that is slightly wider than the length of the slots 2 is employed, enables projecting portions 3 to be formed between the rows of slots 2, these projecting portions strengthening the filter strips while permitting the entirety of the slots to be employed. Furthermore, this swaging operation on the filter strips obtained by electrolysis improves the quality of the metal, the granular structure of which is converted into a lamellar structure, which imparts greater rigidity to the strip while improving its elastic properties and its wear-resistance because of the workhardening of the metal which imparts greater hardness to the surfaces.
  • a backing plate or ,die employed in the swaging operation can have slight projections located between the slots, which projections then impart to the filter strip 1 the form illustrated in FIG. 5 in which these projecting portions form slightly concave areas 4 with raised portions 5 at the slot edges.
  • This modified form of the swaging operation can also be employed on filterstrips obtained by punching as previously indicated.
  • these slightly concave areas 4 between the raised portions or burrs 5 permit a layer of the treated product to accumulate and this inhibits wear on the filter. In certain cases, and depending upon the nature of the productstreated, it is desirable to prevent this accumulation; then, the burrs 5 can simply be removed, by a buffing operation for example.
  • the present invention also comprises filter plates or stripsobtained by the above-described method, as well as cylindrical or frusto-conical filters particularly for centrifugal draining systems formed by assembling and bending said plates or strips.
  • a method of producing a filter element said filter element having a firstand a second side and a plurality of parallel rows of slots therein, each slot extending through the filter element from the first side to the second side, the method comprising the steps of forming a first slotted portion of the filter element at the first side thereof by a first electrolysis operation, adding a if$3ll$22ill 3Pi2ll1illli ,E means of a second electrolysis operation, said first and second electrolysis operations being carried out to different degrees to produce on said first side slots separated from one another by parts having in crosssection a substantially semicircular convex form, and onsaid second side slots separated by parts having in cross-section a similar convex but considerably flattened form, and swaging the partly formed filter element so that the slots acquire a cross-section in the shape of substantially'a single funnel divergingfrom said second side towards said first side and linear projecting portions are formed at least on the first side of the element between rows of slots.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
US00092690A 1969-11-27 1970-11-25 Method of manufacturing filter elements Expired - Lifetime US3708848A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6940925A FR2068082A6 (enrdf_load_stackoverflow) 1969-11-27 1969-11-27

Publications (1)

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US3708848A true US3708848A (en) 1973-01-09

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US00092690A Expired - Lifetime US3708848A (en) 1969-11-27 1970-11-25 Method of manufacturing filter elements

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US (1) US3708848A (enrdf_load_stackoverflow)
JP (1) JPS531226B1 (enrdf_load_stackoverflow)
FR (1) FR2068082A6 (enrdf_load_stackoverflow)
NL (1) NL7016993A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288330A (en) * 1973-04-03 1981-09-08 Filtrox Maschinenbau Ag Support with rotary symmetric openings for filter aid, method and apparatus
US4293414A (en) * 1978-05-04 1981-10-06 Ecodyne Corporation Slotted sheet filter element
US4487930A (en) * 1982-09-07 1984-12-11 The Dow Chemical Company 6-[(Cyclic amino)alkylamino]-tetrahydrotriazolo[3,4-a]phthalazines
US5015383A (en) * 1989-06-15 1991-05-14 Johnson Filtration Systems Inc. Slotted screen scallops for high loading pressures and method of making same
WO1992004095A1 (en) * 1990-08-30 1992-03-19 Henry Filters, Inc. Filter apparatus for machine tool coolant
US5637213A (en) * 1990-08-30 1997-06-10 Henry Filters, Inc. Immersible filter drum unit and method for assembling thereof
US6745841B2 (en) * 2001-03-20 2004-06-08 Weatherford/Lamb, Inc. Tube manufacture
US20090065033A1 (en) * 2007-09-04 2009-03-12 Lg Electronics Inc. Garbage collecting apparatus of dishwasher

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2226381A (en) * 1938-04-22 1940-12-24 Edward O Norris Inc Process of producing electrolytic foraminous sheets
US2226383A (en) * 1938-08-31 1940-12-24 Edward O Norris Inc Process of producing foraminous sheets
US3044167A (en) * 1959-02-13 1962-07-17 Const Guinard Soc Gang cutting and forming punch for the manufacture of filtering elements
US3049796A (en) * 1957-07-12 1962-08-21 Pall Corp Perforate metal sheets
US3359192A (en) * 1965-03-12 1967-12-19 Balco Filtertechnik Gmbh Process of manufacturing a sieve plate having apertures of nonuniform crosssection
US3520418A (en) * 1966-01-25 1970-07-14 Etablis Pompes Guinard Filter elements and the manufacture thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2226381A (en) * 1938-04-22 1940-12-24 Edward O Norris Inc Process of producing electrolytic foraminous sheets
US2226383A (en) * 1938-08-31 1940-12-24 Edward O Norris Inc Process of producing foraminous sheets
US3049796A (en) * 1957-07-12 1962-08-21 Pall Corp Perforate metal sheets
US3044167A (en) * 1959-02-13 1962-07-17 Const Guinard Soc Gang cutting and forming punch for the manufacture of filtering elements
US3359192A (en) * 1965-03-12 1967-12-19 Balco Filtertechnik Gmbh Process of manufacturing a sieve plate having apertures of nonuniform crosssection
US3520418A (en) * 1966-01-25 1970-07-14 Etablis Pompes Guinard Filter elements and the manufacture thereof

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288330A (en) * 1973-04-03 1981-09-08 Filtrox Maschinenbau Ag Support with rotary symmetric openings for filter aid, method and apparatus
US4293414A (en) * 1978-05-04 1981-10-06 Ecodyne Corporation Slotted sheet filter element
US4487930A (en) * 1982-09-07 1984-12-11 The Dow Chemical Company 6-[(Cyclic amino)alkylamino]-tetrahydrotriazolo[3,4-a]phthalazines
US5015383A (en) * 1989-06-15 1991-05-14 Johnson Filtration Systems Inc. Slotted screen scallops for high loading pressures and method of making same
WO1992004095A1 (en) * 1990-08-30 1992-03-19 Henry Filters, Inc. Filter apparatus for machine tool coolant
US5158691A (en) * 1990-08-30 1992-10-27 Henry Filters, Inc. Filter apparatus and method for filtering contaminants from machine tool coolant
US5637213A (en) * 1990-08-30 1997-06-10 Henry Filters, Inc. Immersible filter drum unit and method for assembling thereof
US5820756A (en) * 1990-08-30 1998-10-13 Mcewen; Stephen N. Disc filter assembly for machine tool coolant
US6745841B2 (en) * 2001-03-20 2004-06-08 Weatherford/Lamb, Inc. Tube manufacture
US20090065033A1 (en) * 2007-09-04 2009-03-12 Lg Electronics Inc. Garbage collecting apparatus of dishwasher
US8276602B2 (en) * 2007-09-04 2012-10-02 Lg Electronics Inc. Garbage collecting apparatus of dishwasher
DE102008045782B4 (de) * 2007-09-04 2016-08-11 Lg Electronics Inc. Schmutzauffangvorrichtung eines Geschirrspülers

Also Published As

Publication number Publication date
FR2068082A6 (enrdf_load_stackoverflow) 1971-08-20
NL7016993A (enrdf_load_stackoverflow) 1971-06-01
JPS531226B1 (enrdf_load_stackoverflow) 1978-01-17

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