WO2005016844A1 - Fiberboard panel having improved acoustics and durability - Google Patents

Fiberboard panel having improved acoustics and durability Download PDF

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Publication number
WO2005016844A1
WO2005016844A1 PCT/US2004/025115 US2004025115W WO2005016844A1 WO 2005016844 A1 WO2005016844 A1 WO 2005016844A1 US 2004025115 W US2004025115 W US 2004025115W WO 2005016844 A1 WO2005016844 A1 WO 2005016844A1
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WO
WIPO (PCT)
Prior art keywords
panel
perlite
range
mineral
fibers
Prior art date
Application number
PCT/US2004/025115
Other languages
French (fr)
Inventor
John Felegi, Jr.
Robert C. Garman
Original Assignee
Armstrong World Industries, Inc.
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 Armstrong World Industries, Inc. filed Critical Armstrong World Industries, Inc.
Priority to EP20040780022 priority Critical patent/EP1654205A1/en
Publication of WO2005016844A1 publication Critical patent/WO2005016844A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/28—Polysaccharides or derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/16—Special fibreboard
    • D21J1/20—Insulating board
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/52—Sound-insulating materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249922—Embodying intertwined or helical component[s]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2922—Nonlinear [e.g., crimped, coiled, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2927—Rod, strand, filament or fiber including structurally defined particulate matter

Definitions

  • the present invention relates to the field of fiberboard panels. More particularly, the invention relates to fiberboard panel formulations which can be fabricated into durable acoustical panels having a fine textured appearance using a wet-felting process. Fiberboard panels can provide aesthetic appeal, acoustical modification or dampening, accessibility to space above the ceiling plane, and simple installation and removal. To accommodate these features at a relatively low cost, panels are constructed using strong but relatively inexpensive panel-forming materials, such as mineral fiber, cellulosic fiber, perlite and binder. Two of several fiberboard performance properties sought to be optimized are acoustical resistivity and board hardness.
  • the wet-felting process is a known process for fabricating acoustical panels.
  • an aqueous slurry of the panel-forming materials is deposited onto a moving wire screen, such as a fourdrinier or cylinder former.
  • a wet mat is formed by dewatering the aqueous slurry by gravity and then optionally by vacuum suction.
  • the wet mat is pressed to a desired thickness between press rolls and the wire screen for additional dewatering.
  • the pressed mat is dried in ovens or kilns and then cut to produce acoustical panels.
  • the combination of low level resistivity and high level board hardness has not been achieved in single layer fiberboards produced using conventional wet-felting technology.
  • One known way to obtain the aforementioned combination of performance properties via the wet-felting process is to use overlays having nodulated mineral fibers. Wet-formed panels having nodulated mineral fiber overlays, are described in U.S. Patent Application No. 09/860,271.
  • the disadvantages of the overlay technology are the high capital cost necessary to produce and adhere the overlay and the overall increased process complexity.
  • the aforementioned performance properties can also be achieved in fiberboard panels using the well know cast process.
  • a mixture of mineral fiber, cellulosic fiber, perlite, binder and other board-forming ingredients are deposited on trays which have been covered with paper or foil.
  • the filled trays are typically placed in an oven in order to dry the mixture.
  • the dried sheets are typically surface treated to obtain a desired thickness and are cut into panels.
  • One of the disadvantages of using the cast technology to achieve the desired performance properties is the high cost to produce the panels which results from the slow production rate.
  • the fine textured fiberboard panel of the invention exhibits a combination of performance properties, including a low resistivity value and a high board hardness value, which heretofore have not been achieved in a single layer wet-felted unpunched product.
  • the fiberboard panel of the invention includes mineral fibers, perlite, cellulosic fibers, and binder.
  • the mineral fibers comprise from about 50% to about 85%, the perlite comprises from 0% to about 18%, the cellulosic fiber comprises from about 2% to about 7% and the binder comprises from about 6% to about 15% of the panel on a dry solids weight basis.
  • the concentration of mineral fibers includes from about 30% to about 65% nodulated mineral fiber.
  • the perlite has a density in the range from about 7 to about 20 pcf.
  • the resulting performance properties of the board include a resistivity value in the range from about 200,000 to about 400,000 mks rayls/m and a hardness value in the range from about 85 to about 130 lbf.
  • the solids content of the slurry is from about 50% to about 85% mineral fiber.
  • Useful mineral fibers include metal slag wool, fiberglass, rock wool and mineral wool.
  • the formulation also contains 0% to about 18% by weight perlite particles.
  • the perlite suitably has a density in the range from about 7 to about 20 pcf.
  • the slurry also contains from about 2% to about 7% weight percent cellulosic fibers on a dry solids basis.
  • Useful cellulosic fibers include secondary groundwood fibers, primary or secondary wood fibers or plant fibers.
  • the formulation also contains a binding agent in the range from about 6% to about 15% weight percent on a dry solids basis.
  • a binding agent including pearl cornstarch, wheat starch, potato starch, chemically modified starch, polystyrene, polyvinyl acetate, polystyrene acrylics and styrene butadiene.
  • the formulation may also contain 0% to about 20% weight dry solids basis filler.
  • Useful fillers include kaolin clay, calcium carbonate, silica, vermiculite, bentonite or ball clay, talc, mica and gypsum.
  • Other auxiliary additives can be added into the formulation. These substances include broke, flocculants, defoaming agents and biocides. The proper amounts of such auxiliary additives can readily be determined by those skilled in the art.
  • the formed panel can contain up to about 30%, and more preferably 25% (dry weight basis), broke.
  • Broke is usually recycled panel or panel-forming components such as flat scrap, sander dust and edge trimmings.
  • Fiberboard panels made in accordance with the aforementioned material ranges of solids had the following physical properties:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Paper (AREA)

Abstract

A fine textured fiberboard panel having a low resistivity value and a high board hardness value. The panel includes mineral fibers, perlite, cellulosic fibers, and binder. The mineral fibers comprise from about 50% to about 85%, the perlite comprises from 0% to about 18%, the cellulosic fiber comprises from about 2% to about 7% and the binder comprises from about 6% to about 15% of the panel on a dry solids weight basis. The concentration of mineral fibers includes from about 30% to about 65% nodulated mineral fiber. The perlite has a density in the range from about 7 to about 20 pcf.

Description

FIBERBOARD PANEL HAVING IMPROVED ACOUSTICS AND DURABILITY
The present invention relates to the field of fiberboard panels. More particularly, the invention relates to fiberboard panel formulations which can be fabricated into durable acoustical panels having a fine textured appearance using a wet-felting process. Fiberboard panels can provide aesthetic appeal, acoustical modification or dampening, accessibility to space above the ceiling plane, and simple installation and removal. To accommodate these features at a relatively low cost, panels are constructed using strong but relatively inexpensive panel-forming materials, such as mineral fiber, cellulosic fiber, perlite and binder. Two of several fiberboard performance properties sought to be optimized are acoustical resistivity and board hardness. Those skilled in the art will appreciate that most conventional attempts to optimize one or both of these performance properties, including modifying the formulation of the panel and/or the process for producing the panel, resulted in improved performance of one characteristic and a reduction in the performance of the other. The wet-felting process is a known process for fabricating acoustical panels. In the wet- felting process, an aqueous slurry of the panel-forming materials is deposited onto a moving wire screen, such as a fourdrinier or cylinder former. On the wire screen of a fourdrinier, a wet mat is formed by dewatering the aqueous slurry by gravity and then optionally by vacuum suction. The wet mat is pressed to a desired thickness between press rolls and the wire screen for additional dewatering. The pressed mat is dried in ovens or kilns and then cut to produce acoustical panels. However, the combination of low level resistivity and high level board hardness has not been achieved in single layer fiberboards produced using conventional wet-felting technology. One known way to obtain the aforementioned combination of performance properties via the wet-felting process is to use overlays having nodulated mineral fibers. Wet-formed panels having nodulated mineral fiber overlays, are described in U.S. Patent Application No. 09/860,271. The disadvantages of the overlay technology are the high capital cost necessary to produce and adhere the overlay and the overall increased process complexity. The aforementioned performance properties can also be achieved in fiberboard panels using the well know cast process. In the cast process, a mixture of mineral fiber, cellulosic fiber, perlite, binder and other board-forming ingredients are deposited on trays which have been covered with paper or foil. The filled trays are typically placed in an oven in order to dry the mixture. The dried sheets are typically surface treated to obtain a desired thickness and are cut into panels. One of the disadvantages of using the cast technology to achieve the desired performance properties is the high cost to produce the panels which results from the slow production rate. The fine textured fiberboard panel of the invention exhibits a combination of performance properties, including a low resistivity value and a high board hardness value, which heretofore have not been achieved in a single layer wet-felted unpunched product. The fiberboard panel of the invention includes mineral fibers, perlite, cellulosic fibers, and binder. The mineral fibers comprise from about 50% to about 85%, the perlite comprises from 0% to about 18%, the cellulosic fiber comprises from about 2% to about 7% and the binder comprises from about 6% to about 15% of the panel on a dry solids weight basis. The concentration of mineral fibers includes from about 30% to about 65% nodulated mineral fiber. The perlite has a density in the range from about 7 to about 20 pcf. The resulting performance properties of the board include a resistivity value in the range from about 200,000 to about 400,000 mks rayls/m and a hardness value in the range from about 85 to about 130 lbf. The following description of the invention is provided as an enabling teaching of the invention in its best, currently known embodiment. Those skilled in the relevant art will recognize that many changes can be made to the embodiments described while still obtaining the beneficial results of the present invention. It will also be apparent that some of the desired benefits of the present invention can be obtained by selecting some of the features of the present invention without utilizing other features. Accordingly, those who work in the art will recognize that many modifications and adaptations to the present invention are possible and may even be desirable in certain circumstances and are a part of the present invention. Thus, the following description is provided as illustrative of the principles of the present invention and not in limitation thereof, since the scope of the present invention is defined by the claims. It has been determined that a high mineral fiber formula with low percentages of relatively high density perlite will yield the acoustical resistivity necessary to obtain an NRC in the range from about 0.65 to about 0.75. The formulation of the fiberboard includes the following ingredients in the listed percentages by dry weight:
Figure imgf000004_0001
As displayed in the listing, the solids content of the slurry is from about 50% to about 85% mineral fiber. Useful mineral fibers include metal slag wool, fiberglass, rock wool and mineral wool. The formulation also contains 0% to about 18% by weight perlite particles. The perlite suitably has a density in the range from about 7 to about 20 pcf. The slurry also contains from about 2% to about 7% weight percent cellulosic fibers on a dry solids basis. Useful cellulosic fibers include secondary groundwood fibers, primary or secondary wood fibers or plant fibers. The formulation also contains a binding agent in the range from about 6% to about 15% weight percent on a dry solids basis. Numerous materials may be used as a binding agent including pearl cornstarch, wheat starch, potato starch, chemically modified starch, polystyrene, polyvinyl acetate, polystyrene acrylics and styrene butadiene. The formulation may also contain 0% to about 20% weight dry solids basis filler. Useful fillers include kaolin clay, calcium carbonate, silica, vermiculite, bentonite or ball clay, talc, mica and gypsum. Other auxiliary additives can be added into the formulation. These substances include broke, flocculants, defoaming agents and biocides. The proper amounts of such auxiliary additives can readily be determined by those skilled in the art. For example, the formed panel can contain up to about 30%, and more preferably 25% (dry weight basis), broke. Broke is usually recycled panel or panel-forming components such as flat scrap, sander dust and edge trimmings. Fiberboard panels made in accordance with the aforementioned material ranges of solids had the following physical properties:
Figure imgf000005_0001
Figure imgf000006_0001
Hardness is tested in accordance with ASTM C367-95, Sections 2-7. Resistivity is measured in accordance with ASTM Test C522-87. The foregoing is considered as illustrative only of the principles of the invention. Further, various modifications may be made of the invention without departing from the scope thereof and it is desired, therefore, that only such limitations shall be placed thereon as are imposed by the prior art and which are set forth in the appended claims.

Claims

We claim: 1. A panel comprising mineral fibers, perlite, cellulosic fibers, and binder; characterized in that the mineral fibers comprising about 50% to about 85%, the perlite comprising 0% to about 18%, the mineral filler comprising 0% to about 20%, the cellulosic fiber comprising about 2% to about 7% and the binder comprising about 6% to about 15%, of a dry solids weight of said panel; wherein from about 30% to about 65% of the mineral fibers are nodulated; whereby a resistivity value in the range from about 200,000 to about 400,000 mks rayls/m and a hardness value in the range from about 85 to about 130 lbf is achieved in the panel.
2. The panel of claim 1, characterized in that the perlite has a density in the range from about 7 to about 20 pcf.
3. The panel of claim 2, characterized in that the perlite has a density greater than 8.5 to about 20 pcf.
4. The panel of claim 3, characterized in that the perlite has a density in the range from about 9 to about 20 pcf.
5. The panel of claim 1, characterized in that the panel further comprises from 0% to about 20% mineral filler.
6. The panel of claim 1, characterized in that the panel has an NRC in the range from about 0.65 to about 0.75.
7. A panel comprising mineral fibers, perlite, cellulosic fibers, and binder; characterized in that the mineral fibers comprising about 50% to about 85%, the perlite comprising 0% to about 18%, the mineral filler comprising 0% to about 20%, the cellulosic fiber comprising about 2% to about 7% and the binder comprising about 6% to about 15%, of a dry solids weight of said panel; wherein the perlite has a density greater than 8.5 to about 20 pcf; whereby a resistivity value in the range from about 200,000 to about 400,000 mks rayls/m and a hardness value in the range from about 85 to about 130 lbf is achieved in the panel.
8. The panel of claim 7, characterized in that the perlite has a density in the range from about 9 to about 20 pcf.
9. The panel of claim 7, characterized in that the panel has an NRC in the range from about 0.65 to about 0.75.
10. The panel of claim 7, characterized in that the panel further comprises from 0% to about 20% mineral filler.
PCT/US2004/025115 2003-08-07 2004-08-04 Fiberboard panel having improved acoustics and durability WO2005016844A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20040780022 EP1654205A1 (en) 2003-08-07 2004-08-04 Fiberboard panel having improved acoustics and durability

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/636,405 2003-08-07
US10/636,405 US6919132B2 (en) 2003-08-07 2003-08-07 Fiberboard panel having improved acoustics and durability

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EP (1) EP1654205A1 (en)
RU (1) RU2006106912A (en)
WO (1) WO2005016844A1 (en)

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US7703243B2 (en) * 2006-02-13 2010-04-27 Usg Interiors, Inc. Ceiling tile construction
US8309231B2 (en) * 2006-05-31 2012-11-13 Usg Interiors, Llc Acoustical tile
US20080176053A1 (en) * 2007-01-24 2008-07-24 United States Cypsum Company Gypsum Wallboard Containing Acoustical Tile
CN101781870B (en) * 2010-02-04 2011-09-28 广东省造纸研究所 High-strength insulation vulcanized fiber board and manufacture process thereof
US8536259B2 (en) 2010-06-24 2013-09-17 Usg Interiors, Llc Formaldehyde free coatings for panels
US9896807B2 (en) 2015-09-25 2018-02-20 Usg Interiors, Llc Acoustical ceiling tile
US9796635B1 (en) 2016-06-22 2017-10-24 Usg Interiors, Llc Large diameter slag wool, composition and method of making same
US20180079691A1 (en) 2016-09-20 2018-03-22 Usg Interiors, Llc Silicate coating for improved acoustical panel performance and methods of making same
US10208477B2 (en) 2016-10-20 2019-02-19 Usg Interiors, Llc Veil finishing process
US10094614B2 (en) 2016-12-14 2018-10-09 Usg Interiors, Llc Method for dewatering acoustical panels
US10696594B2 (en) 2017-08-11 2020-06-30 Usg Interiors, Llc High noise reduction coefficient, low density acoustical tiles
US11111174B2 (en) 2017-09-13 2021-09-07 United States Gypsum Company Mineral fiber roof cover boards
US11753550B2 (en) 2018-06-14 2023-09-12 Usg Interiors, Llc Borate and silicate coating for improved acoustical panel performance and methods of making same

Citations (7)

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US1972493A (en) * 1932-01-29 1934-09-04 Johns Manville Insulating block and process of making the same
US2773764A (en) * 1954-04-22 1956-12-11 Armstrong Cork Co Mineral fiber product
US3093533A (en) * 1960-02-01 1963-06-11 Wood Conversion Co Production of fiberboard containing mineral fiber
EP0347810A2 (en) * 1988-06-23 1989-12-27 The Celotex Corporation Acoustical mineral fiberboard and method of manufacturing same
EP0347809A1 (en) * 1988-06-23 1989-12-27 The Celotex Corporation Method of producing acoustical mineral fiberboard
WO1999008977A1 (en) * 1997-08-20 1999-02-25 Usg Interiors, Inc. Acoustical tile composition
EP1158095A2 (en) * 2000-05-24 2001-11-28 Armstrong World Industries, Inc. Durable acoustical panel and method of making the same

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US5250153A (en) * 1987-01-12 1993-10-05 Usg Interiors, Inc. Method for manufacturing a mineral wool panel
US5071511A (en) * 1988-06-23 1991-12-10 The Celotex Corporation Acoustical mineral fiberboard

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1972493A (en) * 1932-01-29 1934-09-04 Johns Manville Insulating block and process of making the same
US2773764A (en) * 1954-04-22 1956-12-11 Armstrong Cork Co Mineral fiber product
US3093533A (en) * 1960-02-01 1963-06-11 Wood Conversion Co Production of fiberboard containing mineral fiber
EP0347810A2 (en) * 1988-06-23 1989-12-27 The Celotex Corporation Acoustical mineral fiberboard and method of manufacturing same
EP0347809A1 (en) * 1988-06-23 1989-12-27 The Celotex Corporation Method of producing acoustical mineral fiberboard
WO1999008977A1 (en) * 1997-08-20 1999-02-25 Usg Interiors, Inc. Acoustical tile composition
EP1158095A2 (en) * 2000-05-24 2001-11-28 Armstrong World Industries, Inc. Durable acoustical panel and method of making the same

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US20050031842A1 (en) 2005-02-10
US6919132B2 (en) 2005-07-19
EP1654205A1 (en) 2006-05-10
RU2006106912A (en) 2006-07-10

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