WO2002055179A1 - Procede de production d'un filtre plisse et produits obtenus suivant ce procede - Google Patents

Procede de production d'un filtre plisse et produits obtenus suivant ce procede Download PDF

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Publication number
WO2002055179A1
WO2002055179A1 PCT/IB2001/000025 IB0100025W WO02055179A1 WO 2002055179 A1 WO2002055179 A1 WO 2002055179A1 IB 0100025 W IB0100025 W IB 0100025W WO 02055179 A1 WO02055179 A1 WO 02055179A1
Authority
WO
WIPO (PCT)
Prior art keywords
embossments
filter
embossing
fold
distance
Prior art date
Application number
PCT/IB2001/000025
Other languages
German (de)
English (en)
Inventor
Werner Frei
Original Assignee
Werner Frei
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Werner Frei filed Critical Werner Frei
Priority to PCT/IB2001/000025 priority Critical patent/WO2002055179A1/fr
Publication of WO2002055179A1 publication Critical patent/WO2002055179A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B01D46/523—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with means for maintaining spacing between the pleats or folds
    • 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
    • B01D29/01—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 flat filtering elements
    • B01D29/012—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
    • B01D29/01—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 flat filtering elements
    • B01D29/05—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 flat filtering elements supported
    • B01D29/07—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 flat filtering elements supported with corrugated, folded or wound filtering sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/50—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for air conditioning
    • B01D2279/51—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for air conditioning in clean rooms, e.g. production facilities for electronic devices, laboratories

Definitions

  • the invention relates to the field of filter technology. It relates to a method for producing a filter and products of the method according to the preamble of the independent claims.
  • Filter media for separating solid or gaseous contaminants in air, gases, water, liquids or the like are produced for a wide range of filter products.
  • Proven materials for filters are u. a. Fleeces, felts and fabrics.
  • the nonwovens can be dry or spunbonded such as. B. cotton, wet nonwovens such. B. papers, one- or both-sided laminated nonwovens such. B. glass / polyester fleece or otherwise constructed nonwovens.
  • needle felts made of any synthetic fibers are used in the felts.
  • Monofilament or multifilament fabrics can be made from natural or synthetic man-made fibers or from inorganic materials. Cotton fabrics, nylon fabrics or metal fabrics may be mentioned as examples.
  • a parallel arrangement of pleats has the disadvantage of high flow resistance, high pressure losses and corresponding additional energy costs.
  • the embossing is carried out regardless of the later position of the pleats or bending edges, so that embossing that is in the area of the bending edge causes undesired thickening.
  • the filter material is deformed hot or cold, and possibly reheated.
  • filter papers can be embossed directly in the manufacturing process or in a post-treatment process using embossing rollers with a wide range of geometric patterns.
  • the embossing can be a flat deformation or knot or a scoring, in particular an interrupted scoring or oblique scoring.
  • embossing processes for filter media only embossings with an embossing depth that is constant over the fold height are carried out, which leads to the high flow losses mentioned.
  • the solution according to the invention consists in a method for producing a filter from a filter medium, the filter medium being produced in a web, provided with embossments and pleated along fold lines to form a filter, the embossments serving to keep the spacing between adjacent pleats in the pleated state, and furthermore the embossing is carried out with a variable embossing depth and the embossing depth is varied as a function of a distance from a fold line in such a way that a non-parallel profile of the spacer between the adjacent folds required for a predefinable fold shape results.
  • embossing with variable embossing depth the use of separate spacers, such as e.g. B.
  • the embossing depth as a function of the distance from a fold line, it is achieved on the one hand that embossed folds in the pleated state can be supported on possibly also embossed neighboring folds, so that filter short-circuits are avoided.
  • the non-parallel spacer profile realizes any fold shape with a non-parallel alignment of pleated folds of the filter medium. Pleats that are not aligned in parallel are in turn advantageous for a high filter effect and a good utilization of the entire available filter area. Loss of space due to glued spacers is eliminated.
  • spacer profiles for pleatable filter media can be tailored so that filters with a high degree of separation, large throughputs and good cake detachment are created.
  • cleaning by shaking can be provided because the filter mats are not fixed by adhesive in the pleated state, but remain elastically movable.
  • the embossing depth is changed by varying the lateral extent of the embossments. By varying the lateral expansion, different embossing depths can be achieved without overstressing the filter medium to be embossed.
  • the filter medium can also be provided with convex embossments and concave embossments in order to produce spacers on both sides for several or all pleats in the pleated state. Convex and concave embossing can effectively prevent filter short-circuits on both sides of the pleats.
  • the embossing depth is varied so that in the pleated state an increasing embossing depth is achieved with an increasing pleat height, and / or, if there are parallel fold lines, the embossing depths for such embossings or parts of embossings are kept the same Have clearances to one of the parallel fold lines.
  • flat embossings are carried out for essentially punctiform or local spacing and / or elongated embossings for an extensive spacing.
  • embossing depth can be varied by enlarging or reducing a size of the extensive embossing depending on the distance from one of the fold lines.
  • Surface embossing can be done e.g. B. oval, elliptical or round with an in Dependence of the distance from one of the fold lines of variable diameter.
  • the embossing depth can be varied by increasing or reducing the width of the elongated embossments depending on the distance from a fold line.
  • elongated embossings can be carried out in a straight line for a linear spacer or bent, angled or meandering for a flat spacer.
  • longitudinal embossing can be carried out parallel to one of the fold lines with a constant embossing depth and / or not parallel to a fold line with a variable embossing depth depending on the distance from the fold line.
  • Embossing should be avoided in the area of fold lines because they would limit the ability of the filter medium to be pleated. It is thus avoided that, as was customary in the past, the embossing pattern is arranged randomly relative to the fold lines or bending edges of the pleating.
  • increasing and decreasing embossing depths are alternately carried out along a longitudinal direction of the path of the filter medium between the fold lines, and / or convex and concave embossments are alternately carried out along a width of the path of the filter medium, and / or there is an increase and a decrease of the embossing depths for convex and concave embossings executed in opposite directions.
  • the invention also relates to a filter medium which is in the form of a web and has embossments and fold lines for pleating, the embossments serving to maintain a distance between adjacent pleats in the pleated state, the embossments furthermore having a variable embossing depth and the embossing depth varies as a function of a distance from a fold line so that in the pleated state a non-parallel profile of the spacer between the adjacent folds required for a predeterminable fold shape results.
  • the embossments are designed as described in the exemplary embodiments.
  • the filter medium can be a fleece, in particular a paper, a felt or a fabric.
  • the invention relates to a filter which is produced according to the method and which in particular a particulate filter, a liquid filter, a dust filter or a filter for air pollution z. B. in vehicles, rooms or production facilities.
  • 1 shows a pleated filter with an unembossed or embossed filter medium with constant depth (prior art); 2 shows a web of a filter medium with convex and concave embossings according to an exemplary embodiment of the invention; and
  • FIG. 3 shows the filter medium according to FIG. 2 in the pleated state.
  • Fig. 1 shows a conventional filter 1, which was made from a filter medium 2 by pleating in the form of accordion folds 3. If the harmonica folds 3 are placed close to one another, then two filter surfaces 4a, 4b can touch and short-circuit, i. H. become inactive for filtration.
  • Previous distance maintenance has been achieved by spacing threads (not shown) impregnated with glue on one or better on both sides of the filter medium 2 before pleating, and the spacing threads of adjacent pleats 3 are fused together during pleating.
  • spacer threads or hot glue provide a stable fold shape with folds 3 aligned in parallel.
  • Fig. 2 shows a section of a web 5 of a filter medium 2, z. B. paper 2, with embossings 6, 7, which according to the invention have different embossing depths y.
  • 5a denotes a longitudinal direction and 5b a width of the Web 5.
  • fold lines 8, 9, namely lower fold lines 8 and upper fold lines 9, are provided for later pleating.
  • a fold height x can be defined in the longitudinal direction 5a, the maximum amount 89 is equal to a distance between the lower fold line 8 and an adjacent upper fold line 9.
  • a fold as a whole is designated by 10 and its two fold halves by 10a, 10b.
  • embossments 6 Symmetrical to a lower fold line 8 are arranged positive or convex or upstanding embossments 6, the size w and thus the embossing depth y increases with increasing distance x from the lower fold line 8 to the two adjacent upper fold lines 9.
  • the embossments 6 are also symmetrical with respect to the upper fold lines 9, namely with increasing distance x from the upper fold lines 9 with decreasing size w and thus decreasing embossing depth y.
  • negative or concave or downward embossing are also possible
  • the convex and concave embossments 6, 7 are thus varied in opposite directions in their size w, lateral extent w or their diameter w and thus in their embossing depth y. As shown, they are advantageously arranged alternately in the direction of the width 5b.
  • FIG. 3 shows the mode of action of the embossings 6, 7 with a variable embossing depth y- according to the invention.
  • two fold halves 10a, 10b are folded against one another or pleated, so that an upper side of the web 5 becomes the inside 11 of the fold 10 and a lower side of the web 5 becomes the outside 12 of the fold 10. Due to the pleating, the convex embossments 6 come into contact with one another on the inside of the fold 10 and can contact one another and thus the Support the fold halves 10a, 10b against each other. Due to the increasing or generally variable embossing depth y, a predeterminable spacer profile 67 and thus a predefinable fold shape can be realized.
  • the concave embossments 7 located in the area of the lower fold line 8 fulfill the same function as the convex embossments 6, but with respect to the adjacent folds 10, ie they form a mutual support for the halves 10b, 10a of the adjacent folds 10. Note that for adjacent folds 10, the assignment of inside 11 and outside 12 to the original web 5 is reversed.
  • a V-shaped spacing profile 67 and a V-shaped fold shape are realized in that the embossing depth y of the convex embossments 6 increases in proportion to the distance x from the lower fold line 8 and the embossing depth y of the concave embossings 7 in proportion to the distance x from the lower fold line 8 decreases.
  • a pleating angle ⁇ desired for a filter 1 ' can be specified by choosing an appropriate proportionality factor.
  • the embossments 6, 7 can instead of all for only a part of the folds 10 and / or only for parts, for. B. individual halves 10a, 10b, the folds 10 are performed.
  • Convex embossments 6 can be on a first half 10a and / or a second half 10b Fold 10 and / or concave embossments 7 can be arranged on a second half 10b and / or a first half 10a of a fold 10.
  • the convex embossments 6 can be carried out alone, ie without the concave embossments 1, or vice versa, so that only every second fold 10 has a support or spacer 67.
  • a support can be dispensed with or another spacer can be used; convex embossments 6, or alternatively concave embossments 7, can also be arranged only on every second half 10a or 10b of a fold 10 and z. B.
  • convex embossments 6 on a first half 10a and concave embossments 7 on a second half 10b of the folds 10 can be produced in particular with a double embossing depth y in order to support the folds 10 on both sides with a smaller number of embossments 6, 7 by means of a predeterminable spacer profile To reach 67;
  • non-parallel fold lines 8, 9 and / or non-symmetrical distributions of embossing depths y can be produced to realize special filter geometries l 1 .
  • the embossing depth y can be changed directly, ie without varying a lateral extension w of the embossings 6, 7.
  • Another alternating pattern between convex and concave embossments 6, 7 can be carried out in the width direction 5b.
  • the embossing molds 6, 7 can be designed as flat embossings 6, 7 for an essentially punctiform or local spacer 67 (as shown) and / or as elongated embossings for an extended spacer 67.
  • the flat embossings 6, 7 can, for example, be oval, elliptical or round and in particular with a predeterminable embossing distance z between the embossings 6, 7 into the Filter medium 2 are impressed.
  • a favorable choice of the embossing distance z is a value between 15 mm and 100 mm.
  • Longitudinal embossings can in turn be produced in a wide variety of shapes, for example curved and / or angled and / or in a change of shape.
  • the embossing depth y is advantageously increased or decreased by increasing or decreasing a width of the elongated embossments 6, 7.
  • Linear spacers 67 can be created with straight-line embossings.
  • Longitudinal embossing should be carried out parallel to one of the fold lines 8, 9 with a constant embossing depth y and / or not parallel to a fold line 8, 9 with a variable embossing depth y depending on the distance x from the fold line 8, 9.
  • the fold shapes can be freely specified by choosing the profile of the spacers 67. Wrinkle shapes with non-parallel folds 10 are preferably produced. V-shaped pleat shapes are particularly favorable because they have the same inflow and outflow areas, cause low pressure losses, have a large usable filter area and are exposed to a uniform load and in particular contamination.
  • a pleat height x 1 in the pleated state is advantageously chosen between 10 mm and 100 mm.
  • a pleating angle ⁇ can be specified which is equal to a ratio of the distance x of an embossing 6, 7 from a folding line 8, 9 to the embossing depth y at this distance x.
  • Embossing methods known per se can be used to implement the invention.
  • the filter material 2 is hot deformed or cold deformed and optionally reheated during embossing.
  • the embossing can be done by nubbed rollers.
  • the burling process can be integrated directly into the paper manufacturing process.
  • knobs are used which have knobs, ie surfaces or grooves, for the embossments 6, 7 with a uniform depth.
  • rollers with nubs are now used, in which the nub depth is varied in a manner according to the invention and in particular a required depth profile for the nubs on a nub roller is specified for a longitudinal direction 5a.
  • the distance 89 between adjacent fold lines 8, 9 can be determined from the desired fold height x 'in the pleated state and the desired pleating angle.
  • the fold lines 8, 9 and the knobs can then be arranged on the knob roller so that the knobs come to lie between the fold lines 8, 9.
  • the invention also relates to a filter medium 2 which has been provided with embossings 6, 7 according to the method and a filter 1' which has been produced according to the method.
  • the filter 1 'produced according to the invention can be a suspended matter filter 1', e.g. B. for the hospital area or for clean rooms, around a liquid filter 1 ', for. B. for the production of beverages, cosmetics or pharmaceuticals to a comfort filter 1 ', z. B. for room ventilation, air conditioning or vehicles, or a dedusting filter 1 '.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

L'invention concerne un procédé de production d'un filtre (1') formé d'un support filtrant pouvant être plissé (2), ainsi que les produits obtenus suivant ce procédé. Il est connu d'utiliser des espaceurs permettant de maintenir à distance et parallèlement les plis (3) d'un filtre (1) par des fils espaceurs collés ou par des gaufrages (4c) de profondeur uniforme (y). L'invention est caractérisée en ce que des gaufrages (6, 7) de profondeur variable (y) sont pratiqués dans un support filtrant (2), en ce que la profondeur de gaufrage (y) varie en tant que fonction d'une distance (x) à partir d'une ligne de pliage (8, 9), en vue d'obtenir un profil non parallèle du profil de l'espaceur (67) entre des plis voisins (10) et, de ce fait, une forme de plis prédéterminée. On mentionne comme exemples de forme d'exécution : une profondeur de gaufrage s'accroissant avec une hauteur croissante de plis (x'), des gaufrages convexes et concaves (6, 7) pour les espaceurs des deux côtés (67), une profondeur de gaufrage (y) proportionnelle à un diamètre (w) des gaufrages (6, 7), ainsi que des gaufrages plats (6, 7) ou s'étendant longitudinalement pour un espaceur local ou expansé (67). Le procédé est particulièrement approprié pour l'obtention de formes de filtres à faible perte de charge, à débit élevé, à haut degré de séparation et à détachement satisfaisant du gâteau de filtre.
PCT/IB2001/000025 2001-01-12 2001-01-12 Procede de production d'un filtre plisse et produits obtenus suivant ce procede WO2002055179A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/IB2001/000025 WO2002055179A1 (fr) 2001-01-12 2001-01-12 Procede de production d'un filtre plisse et produits obtenus suivant ce procede

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2001/000025 WO2002055179A1 (fr) 2001-01-12 2001-01-12 Procede de production d'un filtre plisse et produits obtenus suivant ce procede

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2380651A1 (fr) * 2008-12-25 2011-10-26 Nippon Muki Co., Ltd. Cartouche filtrante plissée de filtre à air et filtre à air la mettant en uvre
WO2013139500A1 (fr) * 2012-03-21 2013-09-26 Mann+Hummel Gmbh Elément de filtrage d'un filtre pour le filtrage de fluides et filtre
WO2014173709A1 (fr) * 2013-04-22 2014-10-30 Mahle International Gmbh Procédé et dispositif de réalisation d'éléments filtrants
WO2018094287A1 (fr) * 2016-11-19 2018-05-24 Aqua Membranes Llc Motifs d'interférence pour éléments enroulés en spirale
DE102020201449B3 (de) * 2020-02-06 2021-03-25 Filtration Group Gmbh Ringförmiges Filterelement zum Reinigen eines Fluids und Verfahren zur Herstellung eines solchen Filterelements
CN112805078A (zh) * 2018-09-28 2021-05-14 大金工业株式会社 空气过滤器滤材、过滤包、空气过滤器单元以及制造方法
US11083997B2 (en) 2017-04-20 2021-08-10 Aqua Membranes Inc. Non-nesting, non-deforming patterns for spiral-wound elements
US11090612B2 (en) 2017-04-12 2021-08-17 Aqua Membranes Inc. Graded spacers for filtration wound elements
US11235270B2 (en) 2015-08-17 2022-02-01 Parker-Hannifin Corporation Filter media packs, methods of making and filter media presses
US11278833B2 (en) 2015-08-17 2022-03-22 Parker-Hamilton Corporation Filter media packs, methods of making, and ultrasonic cutting or welding
US11633700B2 (en) 2020-04-07 2023-04-25 Aqua Membranes Inc. Independent spacers and methods
US11745144B2 (en) 2017-10-13 2023-09-05 Aqua Membranes Inc. Bridge support and reduced feed spacers for spiral-wound elements
US11745143B2 (en) 2017-04-20 2023-09-05 Aqua Membranes, Inc. Mixing-promoting spacer patterns for spiral-wound elements
WO2024102211A1 (fr) 2022-11-09 2024-05-16 Baldwin Filters, Inc. Épaisseur de milieu filtrant variable pour une performance d'écoulement et de filtre améliorée

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DE3903698A1 (de) * 1989-02-08 1990-08-09 Lippold Hans Joachim Dr Rer Na Filtereinsatz
DE4440432A1 (de) * 1994-11-02 1996-05-09 Wolfgang Diete Flächiges Filtermaterial und Verfahren zu dessen Herstellung
EP1059108A1 (fr) * 1999-06-11 2000-12-13 Filtrauto Elément filtrant pour moteur à combustion interne

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US4268290A (en) * 1978-05-31 1981-05-19 Engineering Components Limited Air filters
DE3903698A1 (de) * 1989-02-08 1990-08-09 Lippold Hans Joachim Dr Rer Na Filtereinsatz
DE4440432A1 (de) * 1994-11-02 1996-05-09 Wolfgang Diete Flächiges Filtermaterial und Verfahren zu dessen Herstellung
EP1059108A1 (fr) * 1999-06-11 2000-12-13 Filtrauto Elément filtrant pour moteur à combustion interne

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102325575A (zh) * 2008-12-25 2012-01-18 日本无机株式会社 褶式空气过滤器组合件及使用该组合件的空气过滤器
EP2380651A4 (fr) * 2008-12-25 2012-05-30 Nippon Muki Kk Cartouche filtrante plissée de filtre à air et filtre à air la mettant en uvre
US8597393B2 (en) 2008-12-25 2013-12-03 Nippon Muki Co., Ltd. Pleated air filter pack and air filter using same
CN102325575B (zh) * 2008-12-25 2015-05-13 日本无机株式会社 褶式空气过滤器组合件及使用该组合件的空气过滤器
EP2380651A1 (fr) * 2008-12-25 2011-10-26 Nippon Muki Co., Ltd. Cartouche filtrante plissée de filtre à air et filtre à air la mettant en uvre
US10632412B2 (en) 2009-09-07 2020-04-28 Mann+Hummel Gmbh Filter element of a filter for filtering fluids, and a method of manufacturing the filter element
US9919256B2 (en) 2009-09-07 2018-03-20 Mann+Hummel Gmbh Filter element of a filter for filtering fluids, and filter
WO2013139500A1 (fr) * 2012-03-21 2013-09-26 Mann+Hummel Gmbh Elément de filtrage d'un filtre pour le filtrage de fluides et filtre
CN104349831A (zh) * 2012-03-21 2015-02-11 曼·胡默尔有限公司 用于过滤流体的过滤器的过滤元件和过滤器
CN104349831B (zh) * 2012-03-21 2017-03-01 曼·胡默尔有限公司 用于过滤流体的过滤器的过滤元件和过滤器
EP2827967B1 (fr) 2012-03-21 2018-05-30 Mann + Hummel Gmbh Elément de filtrage d'un filtre pour le filtrage de fluides et filtre
WO2014173709A1 (fr) * 2013-04-22 2014-10-30 Mahle International Gmbh Procédé et dispositif de réalisation d'éléments filtrants
US11235270B2 (en) 2015-08-17 2022-02-01 Parker-Hannifin Corporation Filter media packs, methods of making and filter media presses
US11944927B2 (en) 2015-08-17 2024-04-02 Parker Intangibles Llc Filter media packs, methods of making and filter media presses
US11278833B2 (en) 2015-08-17 2022-03-22 Parker-Hamilton Corporation Filter media packs, methods of making, and ultrasonic cutting or welding
KR102033982B1 (ko) 2016-11-19 2019-10-18 아쿠아 멤브레인스 엘엘씨 나선형 권취 요소를 위한 간섭 패턴
US10471391B2 (en) 2016-11-19 2019-11-12 Aqua Membranes, Inc. Flow directing devices for spiral-wound elements
KR20190061087A (ko) * 2016-11-19 2019-06-04 아쿠아 멤브레인스 엘엘씨 나선형 권취 요소를 위한 간섭 패턴
US11040311B2 (en) 2016-11-19 2021-06-22 Aqua Membranes Inc. Interference patterns for spiral wound elements
WO2018094287A1 (fr) * 2016-11-19 2018-05-24 Aqua Membranes Llc Motifs d'interférence pour éléments enroulés en spirale
US11090612B2 (en) 2017-04-12 2021-08-17 Aqua Membranes Inc. Graded spacers for filtration wound elements
US11612862B2 (en) 2017-04-12 2023-03-28 Aqua Membranes Inc. Graded spacers in spiral wound elements
US11896933B2 (en) 2017-04-20 2024-02-13 Aqua Membranes Inc. Non-nesting, non-deforming patterns for spiral-wound elements
US11083997B2 (en) 2017-04-20 2021-08-10 Aqua Membranes Inc. Non-nesting, non-deforming patterns for spiral-wound elements
US11745143B2 (en) 2017-04-20 2023-09-05 Aqua Membranes, Inc. Mixing-promoting spacer patterns for spiral-wound elements
US11745144B2 (en) 2017-10-13 2023-09-05 Aqua Membranes Inc. Bridge support and reduced feed spacers for spiral-wound elements
CN112805078A (zh) * 2018-09-28 2021-05-14 大金工业株式会社 空气过滤器滤材、过滤包、空气过滤器单元以及制造方法
DE102020201449B3 (de) * 2020-02-06 2021-03-25 Filtration Group Gmbh Ringförmiges Filterelement zum Reinigen eines Fluids und Verfahren zur Herstellung eines solchen Filterelements
US11633700B2 (en) 2020-04-07 2023-04-25 Aqua Membranes Inc. Independent spacers and methods
WO2024102211A1 (fr) 2022-11-09 2024-05-16 Baldwin Filters, Inc. Épaisseur de milieu filtrant variable pour une performance d'écoulement et de filtre améliorée

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