Search Patents
  • Systems and methods for making fiber webs
    Patent number: 8758559
    Abstract: Systems and methods for forming fiber webs, including those suitable for use as filter media and battery separators, are provided. In some embodiments, the systems and methods involve a first system for forming a fiber web (e.g., a wet laid system or non-wet laid system) and additionally one or more coating units. The first system for forming a fiber web may be used to form one or more fibrous layers of the fiber web, and the coating unit may be used to form an additional fibrous layer of the fiber web. In some embodiments, the systems and methods can be used to form fiber webs having a gradient in a property across a portion of, or the entire, thickness of the fiber web.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: June 24, 2014
    Assignee: Hollingsworth & Vose Company
    Inventor: David Vallery
  • FILTER MEDIA INCLUDING ORIENTED FIBERS
    Publication number: 20150375150
    Abstract: Filter media incorporating one or more filtration layers that include fibers including fiber portions orientated at a non-zero angle with respect to a surface of the filtration layer are provided. In some embodiments, at least a part of the fiber portions are positioned at an angle of at least 20 degrees (e.g., between 46 degrees and 90 degrees, or between 61 degrees and 90 degrees) with respect to a surface of the filtration layer or an outer or cover layer of the media. This orientation of fiber portions may result in an increased efficiency (e.g., average efficiency and/or initial efficiency) compared to similar filter media that do not include such oriented fiber portions.
    Type: Application
    Filed: June 25, 2014
    Publication date: December 31, 2015
    Applicant: Hollingsworth & Vose Company
    Inventors: Arash Sahbaee, Bruce Smith
  • SYSTEMS AND METHODS FOR MAKING FIBER WEBS
    Publication number: 20140242274
    Abstract: Systems and methods for forming fiber webs, including those suitable for use as filter media and battery separators, are provided. In some embodiments, the systems and methods involve a first system for forming a fiber web (e.g., a wet laid system or non-wet laid system) and additionally one or more coating units. The first system for forming a fiber web may be used to form one or more fibrous layers of the fiber web, and the coating unit may be used to form an additional fibrous layer of the fiber web. In some embodiments, the systems and methods can be used to form fiber webs having a gradient in a property across a portion of, or the entire, thickness of the fiber web.
    Type: Application
    Filed: May 8, 2014
    Publication date: August 28, 2014
    Applicant: Hollingsworth & Vose Company
    Inventor: David Vallery
  • Filter media including a waved filtration layer
    Patent number: 10449474
    Abstract: Filter media including a waved filtration layer are described herein. The filtration layer may be held in a waved configuration by a support layer. In some cases, the filtration layer may have a combination of characteristics (e.g., mean flow pore size, basis weight, amongst others) that can lead to enhanced filtration performance (e.g., reduced air permeability decrease), in particular, in high humidity environments. The filter media may be used to form a variety of filter elements for use in various applications.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: October 22, 2019
    Assignee: Hollingsworth & Vose Company
    Inventors: Bruce Smith, David T. Healey, Ingrid Staisch
  • SYSTEMS AND METHODS FOR MAKING FIBER WEBS
    Publication number: 20140238629
    Abstract: Systems and methods for forming fiber webs, including those suitable for use as filter media and battery separators, are provided. In some embodiments, the systems and methods involve designs which allow improved control of the fiber web forming process. For example, in certain embodiments involving the flowing of more than one fiber mixtures, the amount of mixing of the fiber mixtures may be controlled to produce fiber webs having different structural and/or performance characteristics. In some embodiments, the systems and methods can be used to form fiber webs having a gradient in a property across a portion of, or the entire, thickness of the fiber web.
    Type: Application
    Filed: May 7, 2014
    Publication date: August 28, 2014
    Applicant: Hollingsworth & Vose Company
    Inventors: Milind Godsay, Mark S. Millar
  • CHARGING OF FILTER MEDIA
    Publication number: 20130168893
    Abstract: Methods and systems for charging fiber webs, including those suitable for use as filter media, are provided. In some embodiments, the methods provided herein involve charging a fiber web by passing a substance through the web under suitable conditions to produce a charged article. The substance may be, for example, a substantially non-polar liquid or gas, a compressed fluid, and/or a supercritical fluid (e.g., carbon dioxide). In some embodiments, the method of charging includes releasing the substance from a container, passing the substance through the fiber web, and, optionally, drawing the substance into a vacuum apparatus after it passes through the fiber web.
    Type: Application
    Filed: December 29, 2011
    Publication date: July 4, 2013
    Applicant: Hollingsworth & Vose Company
    Inventors: Sudhakar Jaganathan, Cameron Thomson
  • SYSTEMS AND METHODS FOR MAKING FIBER WEBS
    Publication number: 20130025809
    Abstract: Systems and methods for forming fiber webs, including those suitable for use as filter media and battery separators, are provided. In some embodiments, the systems and methods involve designs which allow improved control of the fiber web forming process. For example, in certain embodiments involving the flowing of more than one fiber mixtures, the amount of mixing of the fiber mixtures may be controlled to produce fiber webs having different structural and/or performance characteristics. In some embodiments, the systems and methods can be used to form fiber webs having a gradient in a property across a portion of, or the entire, thickness of the fiber web.
    Type: Application
    Filed: July 26, 2012
    Publication date: January 31, 2013
    Applicant: Hollingsworth & Vose Company
    Inventors: Milind Godsay, Mark S. Millar
  • NANOFIBERS COMPRISING NANOPARTICLES
    Publication number: 20200179848
    Abstract: Articles and methods relating to filter media are generally provided. In some embodiments, a filter media comprises a non-woven fiber web and a backer layer. The non-woven fiber web may comprise a plurality of continuous nanofibers, e.g., continuous nanofibers having an average diameter of less than or equal to 250 nm. The plurality of the nanofibers may comprise a plurality of nanoparticles at least partially embedded therein. In some embodiments, the plurality of nanoparticles makes up less than or equal to 15 wt % of the plurality of nanofibers. In some embodiments, a solidity of the non-woven fiber web is less than or equal to a solidity of the backer layer.
    Type: Application
    Filed: December 5, 2018
    Publication date: June 11, 2020
    Applicant: Hollingsworth & Vose Company
    Inventors: Keith Higginson, Andrew Willis
  • FILTER MEDIA COMPRISING FIBERS INCLUDING CHARGED PARTICLES
    Publication number: 20160074787
    Abstract: Filter media, including those suitable for hydraulic and/or other applications, and related filter elements and methods associated therewith, are provided. In some embodiments, a filter media described herein may include a layer (e.g., a non-woven layer) comprising a blend of glass fibers and polymeric fibers. The polymeric fibers may comprise a plurality of charged particles at least partially embedded within the polymeric fibers. In some embodiments, the layer comprising the fiber blend may result in an increased air permeability, dust holding capacity, and/or hydraulic gamma (a high ratio of air permeability to efficiency), as compared to filter media that do not include such charged particles.
    Type: Application
    Filed: September 12, 2014
    Publication date: March 17, 2016
    Applicant: Hollingsworth & Vose Company
    Inventors: Elke Schmalz, Marlina Seipp, Juergen Battenfeld
  • FILTER MEDIA WITH A MULTI-LAYER STRUCTURE
    Publication number: 20140144113
    Abstract: Filter media are described. The filter media may include multiple layers. In some embodiments, the filter media include a nanofiber layer adhered to another layer. In some embodiments, the layer to which the nanofiber layer is adhered is formed of multiple fiber types (e.g., fibers that give rise to structures having different air permeabilities and/or pressure drops). In some embodiments, the nanofiber layer is adhered to a single-phase or a multi-phase layer. In some embodiments, the nanofiber layer is manufactured from a meltblown process. The filter media may be designed to have advantageous properties including, in some cases, a high dust particle capture efficiency and/or a high dust holding capacity.
    Type: Application
    Filed: January 31, 2014
    Publication date: May 29, 2014
    Applicant: Hollingsworth & Vose Company
    Inventors: John A. Wertz, Douglas M. Guimond
  • Filter Media Including Polymer Compositions and Blends
    Publication number: 20140346107
    Abstract: Polymer compositions that may be used to form fibers for a fiber web are generally described. In some embodiments, certain properties of the polymer compositions (e.g., molecular weight distribution, melt flow index, melt elasticity, and/or melt toughness) may allow the formation of fiber webs having fine fibers and a relatively low amount of process defects. In some instances, these properties of the polymer composition may be achieved by combining two or more polymer components. Fiber webs formed using the polymer composition may have increased performance and/or better structural characteristics compared to fibers webs formed using a single polymer component.
    Type: Application
    Filed: May 24, 2013
    Publication date: November 27, 2014
    Applicant: Hollingsworth & Vose Company
    Inventors: Nagendra Anantharamaiah, William S. Freeman, Bruce Smith
  • FILTER MEDIA INCLUDING ORIENTED FIBERS
    Publication number: 20200215471
    Abstract: Filter media incorporating one or more filtration layers that include fibers including fiber portions orientated at a non-zero angle with respect to a surface of the filtration layer are provided. In some embodiments, at least a part of the fiber portions are positioned at an angle of at least 20 degrees (e.g., between 46 degrees and 90 degrees, or between 61 degrees and 90 degrees) with respect to a surface of the filtration layer or an outer or cover layer of the media. This orientation of fiber portions may result in an increased efficiency (e.g., average efficiency and/or initial efficiency) compared to similar filter media that do not include such oriented fiber portions.
    Type: Application
    Filed: October 15, 2019
    Publication date: July 9, 2020
    Applicant: Hollingsworth & Vose Company
    Inventors: Arash Sahbaee, Bruce Smith
  • ARTICLES COMPRISING FILTER MEDIA WITH IRREGULAR STRUCTURE AND/OR REVERSIBLY STRETCHABLE LAYERS
    Publication number: 20230415081
    Abstract: Filtration articles and filter elements comprising reversibly stretchable layer filter media are generally provided. The filtration articles and filter elements described herein may be used for various applications, including applications as a respirator or respiratory protective equipment, a medical filter, an indoor air filtration article for HVAC and HEPA applications, a cabin air filter for vehicles, a room air purifier filter, a vacuum cleaner filter, a heavy duty air filter, a hydraulic fluid filter, and a process liquid filtration filter.
    Type: Application
    Filed: February 2, 2023
    Publication date: December 28, 2023
    Applicant: Hollingsworth & Vose Company
    Inventors: Bruce Smith, Mohammad A. Hassan, Maxim Silin, Sudheer Jinka, Gregory Wagner Farell, David T. Healey
  • FIBER WEBS COATED WITH FIBER-CONTAINING RESINS
    Publication number: 20140166572
    Abstract: Fiber webs that may be coated and used in filter media are provided. In some embodiments, the fiber web is a non-woven web that is coated with a resin comprising fibers. For example, the resin may include fibers that have sizes (e.g., diameters) in the nano or micron range. In some cases, the fibers distributed within the resin are fibrillated fibers. The respective characteristics and amounts of the fibers in the resin may be selected to impart desirable properties including enhanced mechanical properties and filtration properties (e.g., relatively high strength and air permeability), amongst other benefits.
    Type: Application
    Filed: December 14, 2012
    Publication date: June 19, 2014
    Applicant: Hollingsworth & Vose Company
    Inventor: Mark Snyder
  • FILTER MEDIA COMPRISING POLYAMIDE FIBERS
    Publication number: 20210370208
    Abstract: Filter media, including those suitable for hydraulic, fuel, HVAC, HEPA, and/or other applications, and related methods are provided. In some embodiments, a filter media described herein may include a layer (e.g., a fine fiber layer) comprising a plurality of fibers comprising polyamide 11. In some embodiments, a filter media comprises a layer (e.g., a fine fiber layer) comprising a plurality of electrospun fibers comprising a material having one or more advantageous properties. In an exemplary set of embodiments, the plurality of fibers comprise polyamide 11 (e.g., Nylon 11). In some embodiments, the polyamide 11 fibers are produced by an electrospinning process.
    Type: Application
    Filed: May 27, 2020
    Publication date: December 2, 2021
    Applicant: Hollingsworth & Vose Company
    Inventors: Praveen Kumar Yegya-Raman, Sneha Swaminathan
  • Graft polymerization, separators, and batteries including the separators
    Publication number: 20020177632
    Abstract: A non-woven sheet of polyolefin fibers having opposed major surfaces is disclosed. Some areas of one or both of the major surfaces are hydrophilic as a consequence of an acrylic graft polymerized with the surfaces of the fibers in those areas while the fibers in other areas of that major surface are free of the graft and, as a consequence, remain hydrophobic. A battery separator composed of at least two such non-woven sheets is also disclosed, as well as batteries having a separator composed of at least one such non-woven sheet. Also disclosed is a non-woven sheet of polyolefin fibers where opposed major surfaces of the sheet are hydrophilic as a consequence of such an acrylic acid graft, but the ion exchange coefficients of the two major surfaces are different.
    Type: Application
    Filed: May 6, 2002
    Publication date: November 28, 2002
    Applicant: Hollingsworth & Vose Company
    Inventor: Wai Ming Choi
  • FILTER MEDIA AND ARTICLES INCLUDING DENDRIMERS AND/OR OTHER COMPONENTS
    Publication number: 20150182896
    Abstract: Articles such as filter media, which include dendrimers and/or other components, are provided. The filter media may further include a water repellant (e.g., a fluorinated species) to impart desirable properties to the media such as high water repellency. The filter media may also have a high efficiency as a function of pressure drop (i.e., high gamma values). In some embodiments, the filter media includes a fiber web which may be formed of various components such as glass fibers. The fiber web can also include additional components such as synthetic fibers, binder components, as well as other additives. The media may be incorporated into a variety of filter element products.
    Type: Application
    Filed: December 29, 2014
    Publication date: July 2, 2015
    Applicant: Hollingsworth & Vose Company
    Inventors: David F. Sealey, Stuart Williams
  • Filter media with irregular structure
    Patent number: 11433332
    Abstract: Articles and methods relating to filter media are generally provided. In some embodiments, a filter media has an irregular surface structure. For instance, the filter media may comprise a plurality of peaks that are irregular in one or more ways. A ratio of a peak height standard deviation to an average peak height may be greater than or equal to 0.05, and/or a ratio of a peak spacing standard deviation to an average peak spacing may be greater than or equal to 0.08. In some embodiments, a filter media comprises a non-woven fiber web having a layer thickness of greater than 0.3 mm and/or a stiffness of less than or equal to 100 mg.
    Type: Grant
    Filed: November 5, 2018
    Date of Patent: September 6, 2022
    Assignee: Hollingsworth & Vose Company
    Inventors: Bruce Smith, Maxim Silin, David T. Healey
  • Filter media with a multi-layer structure
    Patent number: 9283501
    Abstract: Filter media are described. The filter media may include multiple layers. In some embodiments, the filter media include a nanofiber layer adhered to another layer. In some embodiments, the layer to which the nanofiber layer is adhered is formed of multiple fiber types (e.g., fibers that give rise to structures having different air permeabilities and/or pressure drops). In some embodiments, the nanofiber layer is adhered to a single-phase or a multi-phase layer. In some embodiments, the nanofiber layer is manufactured from a meltblown process. The filter media may be designed to have advantageous properties including, in some cases, a high dust particle capture efficiency and/or a high dust holding capacity.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: March 15, 2016
    Assignee: Hollingsworth & Vose Company
    Inventors: John A. Wertz, Douglas M. Guimond
  • FILTER MEDIA SUITABLE FOR HYDRAULIC APPLICATIONS
    Publication number: 20150182893
    Abstract: Filter media, including those suitable for hydraulic applications, and related components, systems, and methods associated therewith are provided. The filter media described herein may include two or more layers, at least one of the layers having a relatively high percentage of microglass fibers. Additionally, the filter media may be designed such that the ratio of average fiber diameters between two layers is relatively small, which can lead to a relatively low resistance ratio between the layers. The filter media has desirable properties including high dirt holding capacity with low basis weight and a low resistance to fluid flow. The media may be incorporated into a variety of filter element products including hydraulic filters.
    Type: Application
    Filed: December 29, 2014
    Publication date: July 2, 2015
    Applicant: Hollingsworth & Vose Company
    Inventors: Milind Godsay, Randall Keisler
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