EP0381452A2 - Akustisches Gewebe - Google Patents

Akustisches Gewebe Download PDF

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Publication number
EP0381452A2
EP0381452A2 EP90300962A EP90300962A EP0381452A2 EP 0381452 A2 EP0381452 A2 EP 0381452A2 EP 90300962 A EP90300962 A EP 90300962A EP 90300962 A EP90300962 A EP 90300962A EP 0381452 A2 EP0381452 A2 EP 0381452A2
Authority
EP
European Patent Office
Prior art keywords
panel
fiberglass
batt
canopy
sheet
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.)
Withdrawn
Application number
EP90300962A
Other languages
English (en)
French (fr)
Other versions
EP0381452A3 (de
Inventor
Denise M. Gendron
Christopher Michael Allen
Roderick George Robbie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0381452A2 publication Critical patent/EP0381452A2/de
Publication of EP0381452A3 publication Critical patent/EP0381452A3/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general

Definitions

  • This invention relates to flexible acoustic sheet material for use in an enclosure to absorb sound.
  • Fabrics presently known for use in the canopy and curtains are acoustically relatively inefficient and/or too expensive for the purpose, and also have structural limitations.
  • One such commercially available fabric is sold by Chemical Fabrics Corporation of Buffalo, New York, U.S.A. under the trademark FABRASORB and has a sound absorption coefficient of .55. Sound absorption coefficients are derived by dividing the sound absorption at graduated frequencies by the total surface area of a specimen in square metres. A single number rating, called the noise reduction coefficient (NRC) is the average of the sound absorption coefficients of a material for various frequencies rounded to the nearest multiple of 0.05. The higher the NRC value, the better the material performance. Besides its relatively low sound absorption coefficient FABRASORB cannot be sewn or folded and it is affected by moisture, also Chemfab is expensive to colour.
  • the present invention consists of an acoustic fabric comprising a central sheet or batt of fiberglass sandwiched between two sheets of loosely woven unsealed sailcloth.
  • the fabric is quilted.
  • the invention also resides in a canopy and/or cut off curtains made up of panels of the fabric.
  • FIG. 1 and 2 of the drawings consists of a composite rectangular fabric sheet in the form of a panel 10, comprising a centre batt 12 of fiberglass lying between two outer layers 14 of loosely woven unsealed sailcloth.
  • Panel 10 is quilted by a grid 16 of stitching to maintain layers 14 in position in abutting relationship with batt 12.
  • Each side edge 18 of panel 10 carries spaced grommets 20.
  • Fiberglass batt 12 may have a density between 8 and 24 kilograms per cubic metre and a preferred batt is about one-half inch in thickness with a density of 16 kilograms per cubic metre (one pound per square foot).
  • Outer layers 14 may be of DACRON which is a trade mark of a polyester fibre sold by Du Pont Canada Inc., preferably fire retardant using, for example, a bath or spray of ammonium polyphosphate.
  • a canopy 24 constructed from panels 10 is shown in Figure 3 of the drawings and consists of a plurality of panels attached together by pairs of releasable spring hooks 26. Canopy 24 is attached to a rail or bar 28 by releasable spring hooks 30.
  • a zipper component 32 may be fixed by stitching 34 to panel 10 for the removable attachment of a banner 36 to be suspended from canopy 24, as seen in Figure 3 and more particularly in Figure 5.
  • a storage bag 40 of a duffle type for sheets 10 is shown in Figure 6 and consists of a bottom portion 42 and a top portion 44 which is foldable over the bottom portion and closable by a zipper 46. Attached to the ends of top portion 44 are handles 48. Bag 40 is of a size to accommodate, in stacked arrangement, the number of sheets 10 forming a panel 26.
  • Figure 8 of the drawings shows the absorption coefficients of the fabric of the invention for frequencies ranging from 80 Hz to 5000 Hz, compared with the sound absorption coefficient of FABRASORB (a trade mark of Chemical Fabrics Corporation used with an acoustically absorbent fabric) for the same range of frequencies.
  • the following table 1 shows the readings used to plot the graph of Figure 8, using a banner suspended horizontally by ropes to corner grommets 22 in a reverberation chamber by a mounting designated Mounting Type H as listed in ASTM E795-83.
  • the test was conducted in accordance with the requirements of ASTM C423-84 using a sample area of 3.19 square metres of sheet 10.5 millimetres thick.
  • the sample used for the test comprised a fiberglass batt approximately one-half inch thick having a density of 16 kilograms per cubic metre sandwiched between two layers of Dacron (polyester fibre) unsealed sailcloth and quilted.
  • TABLE 1 Frequency Hz Invention Sample Sound Absorption Coefficients Fabrasorb Sample Sound Absorption Coefficients 80 .33 .26 100 .12 .27 125 .14 .30 160 .19 .32 200 .29 .34 250 .45 .43 315 .60 .47 400 .72 .52 500 .75 .55 630 .81 .55 800 .92 .59 1000 1.04 .60 1250 1.15 .62 1600 1.33 .66 2000 1.44 .67 2500 1.51 .67 3150 1.55 .69 4000 1.59 .73 5000 1.56 .73
  • the single noise reduction coefficient (NRC) of the tested sample was .90 compared with an NRC of .55 for FABRASORB.
  • the fabric of the invention can be produced in any width.
  • the multiple sheets and the zippers associated with the sheets are not essential and are shown in the example embodiment as one use of the invention.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Finishing Walls (AREA)
EP19900300962 1989-01-31 1990-01-30 Akustisches Gewebe Withdrawn EP0381452A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US30432089A 1989-01-31 1989-01-31
US304320 1989-01-31

Publications (2)

Publication Number Publication Date
EP0381452A2 true EP0381452A2 (de) 1990-08-08
EP0381452A3 EP0381452A3 (de) 1992-02-19

Family

ID=23176022

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900300962 Withdrawn EP0381452A3 (de) 1989-01-31 1990-01-30 Akustisches Gewebe

Country Status (1)

Country Link
EP (1) EP0381452A3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1877630A2 (de) * 2005-04-04 2008-01-16 Armstrong World Industries, Inc. Akustikdeckensystem

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2139950A (en) * 1983-04-28 1984-11-21 Honda Motor Co Ltd Composite sound and heat insulating board
FR2546817A1 (fr) * 1983-05-30 1984-12-07 Coopetanche Sa Materiaux composites et gaines de garnissage interieur pour conduites realisees en ces materiaux
US4590714A (en) * 1984-11-02 1986-05-27 Manville Service Corporation Heat insulating tarpaulin
GB2200591A (en) * 1987-01-30 1988-08-10 Salex Acoustic Materials Limit Improved acoustic attenuating material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2139950A (en) * 1983-04-28 1984-11-21 Honda Motor Co Ltd Composite sound and heat insulating board
FR2546817A1 (fr) * 1983-05-30 1984-12-07 Coopetanche Sa Materiaux composites et gaines de garnissage interieur pour conduites realisees en ces materiaux
US4590714A (en) * 1984-11-02 1986-05-27 Manville Service Corporation Heat insulating tarpaulin
GB2200591A (en) * 1987-01-30 1988-08-10 Salex Acoustic Materials Limit Improved acoustic attenuating material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1877630A2 (de) * 2005-04-04 2008-01-16 Armstrong World Industries, Inc. Akustikdeckensystem
EP1877630A4 (de) * 2005-04-04 2009-06-10 Armstrong World Ind Inc Akustikdeckensystem
US7947615B2 (en) 2005-04-04 2011-05-24 Awi Licensing Company Acoustical canopy system

Also Published As

Publication number Publication date
EP0381452A3 (de) 1992-02-19

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