Search Patents
  • Systems and methods for making fiber webs
    Patent number: 9062415
    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: Grant
    Filed: May 7, 2014
    Date of Patent: June 23, 2015
    Assignee: Hollingsworth & Vose Company
    Inventors: Milind Godsay, Mark S. Millar
  • Filter media with charge stabilizing and enhancing additives
    Publication number: 20060079145
    Abstract: Electret filter media having an increased electrostatic charge that is substantially maintained in the presence of heat are provided. In one exemplary embodiment, the filter media includes a melt processable charge enhancing additive, such as a fatty acid amide, and a melt processable charge stabilizing additive, such as a fatty acid metal salt. The charge enhancing additive is particularly effective to increase or enhance the electrostatic charge of the filter media when a charge is imparted thereto, and the charge stabilizing additive is particularly effective to stabilize the charge such that, when the filter media is subjected to a heat treatment, the enhanced electrostatic charge is substantially maintained.
    Type: Application
    Filed: October 13, 2004
    Publication date: April 13, 2006
    Applicant: HOLLINGSWORTH & VOSE COMPANY
    Inventor: Stephen Cox
  • FILTER MEDIA INCLUDING A WAVED FILTRATION LAYER
    Publication number: 20170312673
    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. In some embodiments, at least a surface of the filtration layer is hydrophilic.
    Type: Application
    Filed: March 22, 2017
    Publication date: November 2, 2017
    Applicant: Hollingsworth & Vose Company
    Inventors: Bruce Smith, David T. Healey, Ingrid Rückert, Siqiang Zhu
  • Filter media with a multi-layer structure
    Patent number: 10155187
    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: December 30, 2015
    Date of Patent: December 18, 2018
    Assignee: Hollingsworth & Vose Company
    Inventors: John A. Wertz, Douglas M. Guimond
  • Batteries Containing Bismuth Glass Compositions
    Publication number: 20120028126
    Abstract: Disclosed are glass compositions, glass fiber compositions, glass fiber battery separators, glass fiber filter media, battery additives and active materials formed with glass compositions disclosed, glass fiber radiation shields, and glass fiber paper compositions. Certain embodiments include, among other components, bismuth oxide. Certain embodiments include about 0.5-30% bismuth oxide of the composition by weight and silica oxide at about 54-70% of the composition by weight. Embodiments may also include other components. For example, zinc oxide can make up about 0.01-3% of the composition by weight.
    Type: Application
    Filed: August 2, 2011
    Publication date: February 2, 2012
    Applicant: HOLLINGSWORTH & VOSE COMPANY
    Inventors: George Zguris, John Windisch, Patrick Svoboda, Yuri Vulfson
  • Filter media with improved conductivity
    Patent number: 7964012
    Abstract: Filter media are provided having improved conductivity to enhance filtration efficiency and/or dissipate static charge, and methods for making the same. In one exemplary embodiment, the filter media can include a filtration substrate, and at least one conductive coating disposed on at least a portion of the filtration substrate. In use, the conductive coating is coupled to an energy source and it is effective to emit ions when energy is delivered thereto to increase the efficiency of the filtration substrate and/or to dissipate or eliminate static charge generated during filtration.
    Type: Grant
    Filed: August 2, 2006
    Date of Patent: June 21, 2011
    Assignee: Hollingsworth & Vose Company
    Inventors: Wai M. Choi, Karin N. Soper
  • FILTER MEDIA WITH IRREGULAR STRUCTURE
    Publication number: 20200139281
    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: Application
    Filed: November 5, 2018
    Publication date: May 7, 2020
    Applicant: Hollingsworth & Vose Company
    Inventors: Bruce Smith, Maxim Silub, David T. Healey
  • SYSTEMS AND METHODS FOR MAKING FIBER WEBS
    Publication number: 20130025806
    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: July 26, 2012
    Publication date: January 31, 2013
    Applicant: Hollingsworth & Vose Company
    Inventor: David Vallery
  • FILTER MEDIA COMPRISING FIBRILLATED FIBERS AND GLASS FIBERS
    Publication number: 20220193587
    Abstract: Filter media comprising non-woven fiber webs having one or more advantageous physical properties are generally described. In some embodiments, a filter media and/or non-woven fiber web described herein comprises a combination of fibers that results in enhanced physical properties. For example, the non-woven fiber web may comprise a combination of fiber types that is advantageous, such as a combination comprising fibrillated fibers, glass fibers, and/or binder fibers. In some cases, the filter media and/or non-woven fiber web comprising the combination of fibers may be formed into undulations (e.g., by a creping and/or microcreping process) to further enhance the physical properties of the filter media and/or non-woven fiber.
    Type: Application
    Filed: February 3, 2021
    Publication date: June 23, 2022
    Applicant: Hollingsworth & Vose Company
    Inventors: Xinquan Cheng, Sudhakar Jaganathan, Sudheer Jinka, Praveen Kumar Yegya Raman
  • Glass compositions
    Patent number: 7939166
    Abstract: Disclosed are glass compositions, glass fiber compositions, glass fiber battery separators, glass fiber filter media, battery additives and active materials formed with glass compositions disclosed, glass fiber radiation shields, and glass fiber paper compositions. Certain embodiments include, among other components, bismuth oxide. Certain embodiments include about 0.5-30% bismuth oxide of the composition by weight and silica oxide at about 54-70% of the composition by weight. Embodiments may also include other components. For example, zinc oxide can make up about 0.01-3% of the composition by weight.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: May 10, 2011
    Assignee: Hollingsworth & Vose Company
    Inventors: George Zguris, John Windisch, Patrick Svoboda, Yuri Vulfson
  • FILTER MEDIA AND ARTICLES INCLUDING DENDRIMERS AND/OR OTHER COMPONENTS
    Publication number: 20110147320
    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: January 22, 2010
    Publication date: June 23, 2011
    Applicant: Hollingsworth & Vose Company
    Inventors: David F. Sealey, Stuart Williams
  • FILTER MEDIA HAVING AN OPTIMIZED GRADIENT
    Publication number: 20150053627
    Abstract: Filter media having a gradient in a property and methods associated with such media are provided. In some embodiments, a filter media may have a gradient in mean pore size. The gradient in mean pore size may be across at least a portion of the thickness of the filter media. In some embodiments, the gradient can be represented by an exponential function. The exponential gradient in mean pore size may impart desirable properties to the filter media including enhanced filtration properties (e.g., relatively high dust holding capacity and efficiency), amongst other benefits. The filter media may be particularly well-suited for applications that involve filtering liquids (e.g., hydraulics, fuel, lube, water), though the media may also be used in other applications.
    Type: Application
    Filed: August 26, 2013
    Publication date: February 26, 2015
    Applicant: Hollingsworth & Vose Company
    Inventors: MAXIM SILIN, SUDHAKAR JAGANATHAN
  • Filter media with enhanced stiffness and increased dust holding capacity
    Publication number: 20020187701
    Abstract: A filter media having a high dust holding capacity and increased stiffness is provided. The filter media includes a middle filtering layer formed from at least one meltblown layer and having a dust entering side and a dust exiting side. A first outer layer is disposed on the dust entering side of the filter media and is formed from a meltblown polymer fiber web, and a second outer supporting layer, or backing, is disposed on the dust exiting side of the filter media, and is formed from a spunbond polymer fiber web and, optionally, a meltblown polymer fiber web. The filter media is particularly useful to form ASHRAE filters for applications including heating, refrigeration, and air conditioning filtration.
    Type: Application
    Filed: April 30, 2002
    Publication date: December 12, 2002
    Applicant: HOLLINGSWORTH & VOSE COMPANY
    Inventor: David Thomas Healey
  • FILTER MEDIA WITH IRREGULAR STRUCTURE AND/OR REVERSIBLY STRETCHABLE LAYERS
    Publication number: 20200330913
    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: Application
    Filed: May 4, 2020
    Publication date: October 22, 2020
    Applicant: Hollingsworth & Vose Company
    Inventors: Bruce Smith, Mohammad A. Hassan, Maxim Silin, Sudheer Jinka, Greg Wagner Farell, David T. Healey
  • Filter media suitable for hydraulic applications
    Patent number: 10022657
    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: Grant
    Filed: December 29, 2014
    Date of Patent: July 17, 2018
    Assignee: Hollingsworth & Vose Company
    Inventors: Milind Godsay, Randall Keisler
  • Filter media including a waved filtration layer
    Patent number: 10561972
    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. In some embodiments, at least a surface of the filtration layer is hydrophilic.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: February 18, 2020
    Assignee: Hollingsworth & Vose Company
    Inventors: Bruce Smith, David T. Healey, Ingrid Rückert, Siqiang Zhu
  • Battery Separators with Bismuth Containing Glass Fibers
    Publication number: 20120021295
    Abstract: Disclosed are glass compositions, glass fiber compositions, glass fiber battery separators, glass fiber filter media, battery additives and active materials formed with glass compositions disclosed, glass fiber radiation shields, and glass fiber paper compositions. Certain embodiments include, among other components, bismuth oxide. Certain embodiments include about 0.5-30% bismuth oxide of the composition by weight and silica oxide at about 54-70% of the composition by weight. Embodiments may also include other components. For example, zinc oxide can make up about 0.01-3% of the composition by weight.
    Type: Application
    Filed: August 2, 2011
    Publication date: January 26, 2012
    Applicant: Hollingsworth & Vose Company
    Inventors: George Zguris, John Windisch, Patrick Svoboda, Yuri Vulfson
  • FILTER MEDIA COMPRISING FIBRILLATED FIBERS AND GLASS FIBERS
    Publication number: 20220193589
    Abstract: Filter media comprising non-woven fiber webs having one or more advantageous physical properties are generally described. In some embodiments, a filter media and/or non-woven fiber web described herein comprises a combination of fibers that results in enhanced physical properties. For example, the non-woven fiber web may comprise a combination of fiber types that is advantageous, such as a combination comprising fibrillated fibers, glass fibers, and/or binder fibers. In some cases, the filter media and/or non-woven fiber web comprising the combination of fibers may be formed into undulations (e.g., by a creping and/or microcreping process) to further enhance the physical properties of the filter media and/or non-woven fiber.
    Type: Application
    Filed: December 18, 2020
    Publication date: June 23, 2022
    Applicant: Hollingsworth & Vose Company
    Inventors: Xinquan Cheng, Sudhakar Jaganathan, Sudheer Jinka, Praveen Kumar Yegya Raman
  • Batteries containing bismuth glass compositions
    Patent number: 8012629
    Abstract: Disclosed are glass compositions, glass fiber compositions, glass fiber battery separators, glass fiber filter media, battery additives and active materials formed with glass compositions disclosed, glass fiber radiation shields, and glass fiber paper compositions. Certain embodiments include, among other components, bismuth oxide. Certain embodiments include about 0.5-30% bismuth oxide of the composition by weight and silica oxide at about 54-70% of the composition by weight. Embodiments may also include other components. For example, zinc oxide can make up about 0.01-3% of the composition by weight.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: September 6, 2011
    Assignee: Hollingsworth & Vose Company
    Inventors: George Zguris, John Windisch, Patrick Svoboda, Yuri Vulfson
  • FILTER MEDIA WITH A MULTI-LAYER STRUCTURE
    Publication number: 20190168143
    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: October 25, 2018
    Publication date: June 6, 2019
    Applicant: Hollingsworth & Vose Company
    Inventors: John A. Wertz, Douglas M. Guimond
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