US20170246583A1 - Air filter configured in a roll - Google Patents

Air filter configured in a roll Download PDF

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Publication number
US20170246583A1
US20170246583A1 US15/506,187 US201515506187A US2017246583A1 US 20170246583 A1 US20170246583 A1 US 20170246583A1 US 201515506187 A US201515506187 A US 201515506187A US 2017246583 A1 US2017246583 A1 US 2017246583A1
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US
United States
Prior art keywords
air filter
filter media
filter
air
housing
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.)
Abandoned
Application number
US15/506,187
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English (en)
Inventor
Andrew R. Fox
Glen O. Gregerson
Jonathan S. Langer
Jason S. Lind
Jonathan M. Lise
David J. Prince
Yu Wen Sun
Weilai Jiang
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3M Innovative Properties Co
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3M Innovative Properties Co
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Filing date
Publication date
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Priority to US15/506,187 priority Critical patent/US20170246583A1/en
Assigned to 3M INNOVATIVE PROPERTIES COMPANY reassignment 3M INNOVATIVE PROPERTIES COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LANGER, Jonathan S., JIANG, Weilai, SUN, Yu Wen, PRINCE, DAVID J., GREGERSON, GLEN O., FOX, ANDREW R., LIND, JASON S., LISE, JONATHAN M.
Publication of US20170246583A1 publication Critical patent/US20170246583A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • 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
    • B01D46/0002—Casings; Housings; Frame constructions
    • 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
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0032—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions using electrostatic forces to remove particles, e.g. electret filters
    • 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
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/4227—Manipulating filters or filter elements, e.g. handles or extracting tools
    • 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
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/442—Auxiliary equipment or operation thereof controlling filtration by measuring the concentration of particles
    • 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
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/448—Auxiliary equipment or operation thereof controlling filtration by temperature measuring
    • 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
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/46—Auxiliary equipment or operation thereof controlling filtration automatic
    • 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
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B7/00—Special arrangements or measures in connection with doors or windows
    • E06B7/02—Special arrangements or measures in connection with doors or windows for providing ventilation, e.g. through double windows; Arrangement of ventilation roses
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B7/00—Special arrangements or measures in connection with doors or windows
    • E06B7/02—Special arrangements or measures in connection with doors or windows for providing ventilation, e.g. through double windows; Arrangement of ventilation roses
    • E06B7/03—Ventilating devices for inserting under upwardly-sliding windows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/18—Air-flow control members, e.g. louvres, grilles, flaps or guide plates specially adapted for insertion in flat panels, e.g. in door or window-pane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/108—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
    • F24F8/158—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using active carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2265/04—Permanent measures for connecting different parts of the filter, e.g. welding, glueing or moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/20—Shape of filtering material
    • B01D2275/203—Shapes flexible in their geometry, e.g. bendable, adjustable to a certain size
    • 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
    • B01D2279/35—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for venting arrangements
    • 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
    • B01D2279/40—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for cleaning of environmental air, e.g. by filters installed on vehicles or on streets
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B7/00—Special arrangements or measures in connection with doors or windows
    • E06B7/02—Special arrangements or measures in connection with doors or windows for providing ventilation, e.g. through double windows; Arrangement of ventilation roses
    • E06B2007/023—Air flow induced by fan
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/20—Details or features not otherwise provided for mounted in or close to a window
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/192—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by electrical means, e.g. by applying electrostatic fields or high voltages
    • F24F8/194—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by electrical means, e.g. by applying electrostatic fields or high voltages by filtering using high voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/95—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying specially adapted for specific purposes
    • F24F8/99—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying specially adapted for specific purposes for treating air sourced from urban areas, e.g. from streets

Definitions

  • the present disclosure relates to air filters. More particularly, it relates to adjustably sized air filter systems capable of use in a window opening.
  • Windows are available in a large variety of sizes and can include vertically or horizontally operable sashes to provide air flow between an exterior and an interior of a building structure. Occupants of a building structure often desire opening windows to let fresh air into an interior of a home, business, or otherwise enclosed space. However, in many locations, such as highly populated areas of China, the outside air is more contaminated than the indoor air. Novel filtering solutions are needed to let the fresh aspects of the outdoor air in without letting in the pollution or contaminants. Outdoor contaminants may include larger particles such as pollen, dust, and mold spores and smaller particles such as those forming PM 2.5 , bacteria, and viruses. Gaseous outdoor pollutants such as odors, NO x , SO 2 , ozone, and others may also be of concern in some locations.
  • the inventors of the present disclosure recognized that, in light of the above, a need exists for an air filter that protects users from air quality contaminants, allows fresh air get into the home through windows, can be easily installed and used by consumers, is versatile to fit in most locations, and/or has minimal impact on lighting and visibility.
  • the filter is a window air filter.
  • the inventors of the present disclosure invented various embodiments of air filters, methods of making air filters, and methods of using air filters.
  • Some embodiments relate to an air filter comprising filter media assembly configured in a roll, the filter media assembly including filter media having a leading end opposite a trailing end and first and second opposed side edges extending between the leading end and the trailing end.
  • the air filter further comprises a housing for containing the filter media assembly.
  • the leading edge can be releasably retained on at least one of the exterior or interior of the housing.
  • the filter media assembly is replaceable within the housing.
  • at least one of the leading edge and the trailing edge includes a looped structure, a hooked structure, and/or a fastening device.
  • the first end includes a handle.
  • the filter media assembly is retractable on the roll.
  • the roll includes a central member that is under spring tension. In some embodiments, the central member provides stopping points.
  • the filter media assembly includes sufficient filter media for multiple uses.
  • the filter media assembly includes separation and/or perforation lines or points.
  • Some embodiments further include a hinged attachment mechanism.
  • the hinged attachment mechanism is combined with the housing or attached to the central member.
  • the hinged attachment mechanism is rotatable.
  • the filter media is at least one of moisture-resistant, moisture-repellant, electrostatically charged, an electret nonwoven web, and/or not electrostatically charged.
  • the filter media includes at least one of carbon, activated carbon, a nonwoven, a thermoplastic, a thermosetting material, a porous foam, fiberglass, paper, a high loft spunbound web, a low loft spunbound web, a meltblown web, and/or bi-modal fiber diameter meltblown media.
  • the filter media is pleated.
  • the filter media is at least one of self-supporting and non-self-supporting.
  • Some embodiments further include a cutting device capable of cutting the filter media to a desired size.
  • the cutting device is integrated into the housing.
  • the air filter is a window air filter.
  • kits comprising an air filter as described above or herein and a cutting device capable of cutting the filter media to a desired size.
  • the cutting device is integrated into the housing.
  • kits comprising an filter as described above or herein and an attachment device capable of permanently or semi-permanently attaching the air filter to a window.
  • the attachment device is at least one of a nail, a screw, a hook, an adhesive, and/or an adhesive backed interlocking strip.
  • FIG. 1 is a perspective view of an exemplary retractable air filter in accordance with principles of the present disclosure
  • FIG. 2A is a perspective view of an exemplary retractable air filter in a retracted state in accordance with principles of the present disclosure
  • FIG. 2B is a perspective view of an exemplary retractable air filter in a un-retracted state in accordance with principles of the present disclosure
  • FIG. 3 is a perspective view of an exemplary retractable air filter in accordance with principles of the present disclosure
  • FIGS. 4A-4C are perspective views of an exemplary retractable air filter for use in, for example, a vertically opening window in accordance with principles of the present disclosure.
  • FIG. 5 is a side view of an exemplary retractable air filter installed in, for example, a horizontally opening window in accordance with principles of the present disclosure.
  • the retractable filter 20 includes a filter media assembly 30 having a filter media 32 .
  • the filter media assembly 30 can be in the form of a roll 33 .
  • the filter media 32 is wound on a central member 34 and can be easily expanded and retracted (i.e. unrolled and rolled back up). Details on the various components are provided below.
  • the adjustable length of the filter media assembly 30 due to the retractable nature, allows it to fit in a wide variety of window sizes.
  • the retractable filter 20 can be attached to a partially opened window.
  • the retractable filter 20 can fit a wide variety of window sizes.
  • the retractable filter 20 can be employed in a partially open window, where only 10-30% of the window area is blocked, for example, leaving a large percentage of the window area still open for light passage and visibility.
  • a roll of filter media assembly 30 has a first, or leading, end 36 and a second, or trailing, end (not shown) opposite the first end 36 adjacent to a central member 34 .
  • First and second side edges 38 , 40 extend between the first end 36 and the second end.
  • the filter media assembly 30 is generally rectangular when extended.
  • the first end 36 can include a handle 42 for increased usability.
  • one or both of the first and second side edges 38 , 40 can include a looped structure (generally indicated by dashed line 44 ) or other fastening device, as is discussed in more detail below.
  • the central member 34 may be contained within a housing 50 .
  • the housing 50 can be any suitable shape for containing the roll 33 and/or providing expansion and retraction of the filter media assembly 30 . Some exemplary shaped include rectangular or tubular.
  • the housing 50 includes at least one side 52 and, optionally, top and bottom ends 54 , 56 .
  • the leading end 36 of the filter media assembly 30 is easily accessible to a user and/or can be releasably retained on an exterior or interior of the housing 50 .
  • the filter media assembly 30 is replaceable within the housing 50 .
  • the filter media assembly 30 can be user replaceable without replacing the housing 50 and/or mounting components (see, e.g., FIG. 3 ). In some embodiments, the filter media assembly 30 may also be replaceable without requiring replacement of internal winding (e.g. spring) components. For example, a refill filter media assembly 30 may slidably engage the central member 34 containing the winding components.
  • the housing 50 can provide several benefits, such as, for example, improved seal between the filter media 32 and the window frame, improved aesthetic design, and/or enhanced locations and surface area for mounting the retractable filter 20 to the window structure. In some embodiments, the housing 50 provides a further benefit by firmly defining and fixing the distance between the mounting members for the two ends of the media central roll 34 , which aids in assembly versus requiring the user to measure and install separate brackets.
  • the filter media assembly 30 is retractable onto the roll 33 and unwound, or expanded, from the roll 33 , as indicated by arrow “A” of FIG. 2B .
  • the central member 34 can be a spring-wound inner shaft or similar structure to provide retractability of the filter media assembly 30 .
  • the filter media assembly 30 when the user desires to use the retractable filter 20 in the window, the filter media assembly 30 is unrolled by pulling on the handle 42 of the leading end 36 .
  • the filter media assembly 30 unwinds from the central shaft member 34 , which is under a spring tension, as the user continues to pull.
  • the central member 34 and spring mechanism can provide stopping points, where the length of the unwound filter media assembly 30 can be temporarily fixed, until the spring mechanism is re-engaged.
  • the user wants to return the filter media assembly 30 to within the housing 50 or otherwise retract the filter media assembly 30 , for example to close the window, the user re-engages the spring mechanism, which re-winds the filter media assembly 30 back into the housing 50 .
  • the filter media assembly 30 includes filter media 32 of suitable size to fit a wide variety of window dimensions. In some embodiments, the filter media assembly 30 may be longer than needed for a single use. In some embodiments, the filter media assembly 30 has a length suitable to provide for one or more filter media 32 changes, for example, wherein the dirty filter media 32 is discarded, and a clean segment of filter media 32 is unwound from the next section on the filter media assembly 30 . In some embodiments, the filter media assembly 30 can be cut to expose a new length of clean filter media 32 , providing for multiple filter changes from a single filter media assembly 30 . With particular reference to FIG.
  • the filter media assembly 30 includes a plurality of separation lines 60 to divide the filter media assembly 30 into discrete filter lengths.
  • each separation line 60 can be formed from any number of through-cuts suitable to provide separation.
  • the separations lines 60 are perforated lines formed at positions along the filter media assembly 30 corresponding to common window widths.
  • the separation lines 60 can be at varying (e.g., increasing or decreasing) distances from one another or uniform distances.
  • a cutting device may be integrated into the housing 50 . Any cutting device may be used. In some embodiments, the cutting device can, for example, be a thin metal strip having a serrated edge.
  • the filter media assembly 30 may incorporate looped structures 44 , for example, either integrally or by addition, such as lamination, into one or both of the first and second side edges 38 , 40 .
  • the loop structure 44 may be mated to a hook structure (see, e.g., FIG. 4A ) which is applied to the window frame and/or sash members.
  • the combined hook/loop structure holds in the filter media assembly 30 in place and reasonably seals the side edges 38 , 40 from air bypassing the filter media assembly 30 .
  • low-profile hooks such as used in diapers, may be used, preferably with an adhesive back-side coating. In some embodiments, the hook and loop may be reversed in attachment orientation.
  • the retractable filter 20 may include secondary strips or structures that can be attached to the window frame and/or sash to help facilitate the engagement.
  • the filter media 32 may also or alternatively be conformable, which will allow the filter media 32 to attach to hook structures in multiple planes.
  • FIG. 3 illustrates an exemplary retractable filter 20 including a hinged attachment mechanism 62 , which may be combined with the housing 50 or which may be attached directly to the central member 34 at the roll 33 and the window.
  • the hinge 62 or similar mechanism, is rotatable to allow the filter media assembly 30 to pivot away from the window when the filter media assembly 30 is not in use and swing into the window when in use. This motion could allow for easier user interface and help enable better sealing of the filter media assembly 30 to the window cavity.
  • a locking mechanism (not shown) may be included to help retain the housing 50 in one or more rotated positions.
  • the particular filter media 32 selected for the filter media assembly 30 can be particularly suited have any of the particular desired characteristics described herein.
  • the filter media assembly 30 is constructed from moisture-resistant materials.
  • the filter media may include additional layers or features to specifically block or repel water, such as rain.
  • an electrostatic charge is optionally imparted into or onto material(s) of the filter media 32 .
  • an electrostatically charged media 32 may be used, of which many grades are available, and many of which offer high efficiency with low pressure drop.
  • the filter media 32 can be an electret nonwoven web.
  • Electric charge can be imparted to the filter media 32 in a variety of ways as is well known in the art, for example by hydrocharging, corona charging, etc. (e.g., as described in U.S. Pat. No. 7,947,142, the entirety of which is incorporated by reference herein).
  • the filter media 32 is not electrostatically charged.
  • additional multi-functional media grades which incorporate activated carbon or other materials for purifying gas-phase pollutants, may also or alternatively be incorporated into the filter structure.
  • the filter media 32 can be constructed, for example, from nonwoven fibrous media formed of thermoplastics or thermosetting materials such as polypropylene, linear polyethylene and polyvinyl chloride.
  • suitable, non-limiting materials for the filter media include porous foams, nonwovens, papers, fiberglass, or the like.
  • the filter media 32 comprises a filter media that attracts and captures dust, allergens (such as pollen and mold spores), and/or fine particle pollution from the outdoor air.
  • nonwoven webs useful with the filter media 32 can be a high loft spunbond webs, such as described, for example, in U.S. Pat. No. 8,162,153 to Fox et al., the entirety of which is incorporated herein.
  • the filter media 32 can be a low loft spunbond web, such as is described in U.S. Pat. No. 7,947,142 to Fox et al., the entirety of which is incorporated herein.
  • nonwoven webs useful with the filter media 32 are generated by other techniques and/or have other characteristics, such as the meltblown nonwoven webs disclosed in U.S. Pat. No. 6,858,297 to Shah et al., the entirety of which is incorporated herein.
  • Other non-limiting example of useful nonwoven web formats include bi-modal fiber diameter meltblown media such as those described in U.S. Pat. No. 7,858,163, the entirety of which is incorporated herein.
  • the filter media 32 is an electrostatically charged nonwoven type of media.
  • the filter media 32 can be a pleated filter media including at least a portion that has been folded to form a configuration comprising rows of generally parallel, oppositely oriented folds.
  • pleats can be formed in the filter media 32 (or in the pleated filter media assembly 30 ) using various methods and components as are well known in the art, e.g., to form a pleated filter for use in applications such as air filtration., for example those described in U.S. Pat. No. 6,740,137 to Kubokawa et al. and U.S. Pat. No. 7,622,063 to Sundet et al., the entire teachings of both of which are incorporated herein by reference.
  • the filter media 32 can consist of the filter media or web alone or can include one or more additional components or structures applied or assembled to the filter media 32 so long as the resultant filter media assembly 30 can at least be transitioned from the rolled condition to the unrolled condition without significantly damaging the structural integrity of the filter media assembly 30 .
  • the filter media can be repeatedly transitioned between the rolled and unrolled conditions without significantly damaging the structural integrity of the filter media assembly 30 .
  • the filter media 32 of the assembly 30 can be self-supporting or non-self-supporting. For example, where the filter media assembly 30 consists of the filter media 32 alone, the filter media or web can be self-supporting or non-self-supporting.
  • the filter media 32 can be non-self-supporting with an additional supporting structure rendering the filter media assembly 30 , as a whole, to be self-supporting.
  • the filter media 32 can be wire-backed.
  • self-supporting filter media or web can describe at least one of the following conditions: (1) a filter media or web that is deformation resistant without requiring stiffening layers, adhesive or other reinforcement in the filter media web; or (2) the filter media generally maintains its shape when subjected to an airstream as described, for example, in U.S. Pat. No.
  • non-self-supporting can denote an air filter media that is not capable, in the absence of a support frame and/or a support grill, of withstanding the forces encountered due to typical air flow.
  • the retractable air filters 20 are useful in protecting users from outside air quality contaminants
  • an electrostatically charged media 32 may be used.
  • Additional multi-functional media grades, which incorporate activated carbon or other materials for purifying gas-phase pollutants, may also be incorporated into the filter media assembly 30 .
  • a reasonably low pressure drop can be achieved for the filter, which may help provide moderate airflow through the filter.
  • FIGS. 4A-4C illustrate aspects of the materials and construction of an exemplary retractable filter 120 , similar to retractable filter 20 , installed in a sliding-type window 180 , which can be either single or double hung. Sliding windows are predominant in North America and China. Attachment of the retractable filter 120 to a window 180 , with or without housing 150 , may be either permanent or semi-permanent. In some embodiments, attachment mechanisms 190 , 192 provide secure holding of the retractable filter 120 to the window 180 because the attachment point may undergo moderate stress from the inner spring forces as the filter media assembly 130 is extended and retracted. Some exemplary permanent fixation options include nails, screws, and certain types of adhesives.
  • the attachment is semi-permanent, such as using CommandTM strips, adhesively backed interlocking hooks, rare earth magnets, etc.
  • the housing 150 may be attached to the window frame 182 (or surrounding structures) in the major plane of the window, or it may be attached to the window frame 182 (or surrounding structures) perpendicular to the major plane of the window 180 . In another embodiment, the housing 150 may not be mounted to the window frame 182 at all, and may rather be pinched between the window sash 184 and the window frame 182 . When expanded, the side edges 138 , 140 of the filter media assembly 130 can be attached to the window frame/sill members with mechanical or adhesive components.
  • FIG. 5 illustrates an exemplary retractable filter 220 installed in a horizontal sliding window 280 .
  • the housing 250 of the retractable filter 220 is attached at one end of the window 280 , the window 280 is partially opened, and the filter media assembly 230 is expanded to cover the window gap.
  • a small gap may be created between the two window segments, allowing air to flow from the outside between the two window segments and bypassing the filter media assembly 230 to gain entry to the indoors. In some embodiments, this bypass may be avoided by the use of a piece of foam, weather-stripping, etc. (not shown).
  • the air filters of the present disclosure can be placed in any desired frame or housing. Some exemplary frames are described in, for example, U.S. Patent Application No. 62/041,496 and 62/041,499, both of which are incorporated in their entirety herein.
  • the air filter assembly of the present disclosure can be used in a powered air filtration system such as, for example, that described in U.S. Patent Application No. 62/041,501, incorporated herein in its entirety.
  • the air filter assembly or media of U.S. Pat. No. 62/206,928 can be used in the air filters of the present disclosure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Electrostatic Separation (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
  • Ventilation (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
US15/506,187 2014-08-25 2015-08-24 Air filter configured in a roll Abandoned US20170246583A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/506,187 US20170246583A1 (en) 2014-08-25 2015-08-24 Air filter configured in a roll

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US201462041501P 2014-08-25 2014-08-25
US201462041499P 2014-08-25 2014-08-25
US201462041496P 2014-08-25 2014-08-25
US201462041500P 2014-08-25 2014-08-25
US201562206928P 2015-08-19 2015-08-19
US15/506,187 US20170246583A1 (en) 2014-08-25 2015-08-24 Air filter configured in a roll
PCT/US2015/046490 WO2016032935A1 (en) 2014-08-25 2015-08-24 Air filter configured in a roll

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US20170246583A1 true US20170246583A1 (en) 2017-08-31

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US15/506,187 Abandoned US20170246583A1 (en) 2014-08-25 2015-08-24 Air filter configured in a roll
US15/503,945 Abandoned US20170241192A1 (en) 2014-08-25 2015-08-24 Adjustable air filter
US15/500,752 Active 2037-03-28 US11192059B2 (en) 2014-08-25 2015-08-24 Uniformly expandable air filter
US15/506,103 Abandoned US20170241193A1 (en) 2014-08-25 2015-08-24 Window air filter
US15/506,204 Abandoned US20170241656A1 (en) 2014-08-25 2015-08-24 Powered window air filter
US17/517,239 Active US11642617B2 (en) 2014-08-25 2021-11-02 Uniformly expandable air filter

Family Applications After (5)

Application Number Title Priority Date Filing Date
US15/503,945 Abandoned US20170241192A1 (en) 2014-08-25 2015-08-24 Adjustable air filter
US15/500,752 Active 2037-03-28 US11192059B2 (en) 2014-08-25 2015-08-24 Uniformly expandable air filter
US15/506,103 Abandoned US20170241193A1 (en) 2014-08-25 2015-08-24 Window air filter
US15/506,204 Abandoned US20170241656A1 (en) 2014-08-25 2015-08-24 Powered window air filter
US17/517,239 Active US11642617B2 (en) 2014-08-25 2021-11-02 Uniformly expandable air filter

Country Status (5)

Country Link
US (6) US20170246583A1 (enExample)
JP (5) JP2017528310A (enExample)
CN (5) CN106604768A (enExample)
TW (5) TWI665003B (enExample)
WO (5) WO2016032938A2 (enExample)

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