US2043988A - Lightweight unit - Google Patents

Lightweight unit Download PDF

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Publication number
US2043988A
US2043988A US658937A US65893733A US2043988A US 2043988 A US2043988 A US 2043988A US 658937 A US658937 A US 658937A US 65893733 A US65893733 A US 65893733A US 2043988 A US2043988 A US 2043988A
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United States
Prior art keywords
unit
sound
sheets
sheet
central portion
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US658937A
Inventor
George B Brown
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Johns Manville Corp
Johns Manville
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Johns Manville
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Publication date
Priority to US623799A priority Critical patent/US2132642A/en
Priority to US623731A priority patent/US2043987A/en
Application filed by Johns Manville filed Critical Johns Manville
Priority to US658937A priority patent/US2043988A/en
Priority to BE398436D priority patent/BE398436A/xx
Priority to FR762525D priority patent/FR762525A/en
Application granted granted Critical
Publication of US2043988A publication Critical patent/US2043988A/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B2001/742—Use of special materials; Materials having special structures or shape
    • E04B2001/747—Corrugated materials
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8414—Sound-absorbing elements with non-planar face, e.g. curved, egg-crate shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8423—Tray or frame type panels or blocks, with or without acoustical filling
    • E04B2001/8433—Tray or frame type panels or blocks, with or without acoustical filling with holes in their face
    • E04B2001/8438—Slot shaped holes
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8423—Tray or frame type panels or blocks, with or without acoustical filling
    • E04B2001/8452—Tray or frame type panels or blocks, with or without acoustical filling with peripheral frame members
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8461—Solid slabs or blocks layered
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8461—Solid slabs or blocks layered
    • E04B2001/8471—Solid slabs or blocks layered with non-planar interior transition surfaces between layers, e.g. faceted, corrugated
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
    • E04B2001/848—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element
    • E04B2001/8485—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element the opening being restricted, e.g. forming Helmoltz resonators
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S138/00—Pipes and tubular conduits
    • Y10S138/04—Air conditioning
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • Y10T428/24281—Struck out portion type
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • Y10T428/24322—Composite web or sheet
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24661—Forming, or cooperating to form cells
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24669—Aligned or parallel nonplanarities
    • Y10T428/24694—Parallel corrugations
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24669—Aligned or parallel nonplanarities
    • Y10T428/24694—Parallel corrugations
    • Y10T428/24711—Plural corrugated components
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24669—Aligned or parallel nonplanarities
    • Y10T428/24694—Parallel corrugations
    • Y10T428/24711—Plural corrugated components
    • Y10T428/24727—Plural corrugated components with planar component

Definitions

  • This invention relates to a lightweight unit, particularly a preformed acoustical unit.
  • the preferred embodiment of the invention ⁇ comprises an 'acoustical unit including a central or body portion of spaced sheets, that are per se relatively ineffective in sound-absorption and that define between them a labyrinth of discontinuously communicating spaces, and rigid edge sealing and reenforcing elements adhered to the central portion, the said edge and centralportions being constructed preferably of the same materials, whereby they are adapted toreact identically under changing conditions of environment.
  • the invention comprises, also, a unit o1' the type described in which the edge sealing elements and also an element applied to the back thereof are sound-impermeable and adapted to minimize the passage of sound and the circulation of air through the edges and back of the unit.
  • the invention comprises an acoustical element including sound-absorbing spaces and parallel, closely spaced, narrow slits connecting the said spaces with each other and with an exterior surface of the element.
  • Fig. l shows a plan view ci acoustical unit, which is in part broken down to show the inner structure of the unit;
  • Fig. 2 shows an edge view of the unit illustrated in Fig. l;
  • Fig. 3 shows a cross sectional view on line 3-3 of Fig. l;
  • Fig. 4 shows a plan View, in part broken away, ci a modumbled form of central portion lor soundabsorbing. element
  • Fig. 5 is a cross sectional Fig. 4.
  • the drawing shows a preformed lightweight unit, particularly adapted for the absorption of sound, comprising a sound-absorbing element constituting the central portion i, and edge seaiing and reeniorcing v.strips or elements 2, in-
  • the unit is provided with a sound-permeable outer sheet 3, which is really a part of the sound-absorbing structure, but may be herein referred to, for convenience, as the facing element. Also, the unit is provided, at its back, with an outer backing sheet 4 that is preferably sound-impermeable.
  • the central or body portion l comprises, suitably, composited sheets that are in themselves relatively ineiective in sound-absorption but dene sound-absorbing spaces or passages 5.
  • the .composite includes sheets 6 of irregular surface, alternated with sheets 'I of plane surface. 'Ihe sheets of irregular surface may be corrugated and arranged in the assembly with the corrugations in one sheet extending at an angle, say crosswise, to the corrugations in adjacent sheets.
  • the composited alternating sheets of plane and irregular surface are provided with perforatlons or openings 8, spaced suiiiciently closely to admit incident sound and providing lateral communication between the spaces defined between the sheets..
  • the perforations in adjacent sheets of the same type of surface may be non-registering. This provision, together with the crossing of thecorrugations in adjacent corrugated sheets, provides for maximum discontinuity of communication between the spaces, and causes sound within the unit to undergo numerous deilections in paths that may be of great length as compared to the wave length of the sound itself.
  • the openings adapted to admit incident sound are long slits, say saw kerfs 9.
  • the saw kerfs extend through the sheet of plane surface, to divide it into a plurality of narrow parallel bands, and extend also through the tops of the corrugations on one side of the several corrugated sheets, to cause the numerous spaces defined by the troughs in the corrugated sheet and the plane sheet to communicate with each other.
  • the central portions are relatively compressihle and non-rigid and have inadequate strength for many purposes. Furthermore, the edges thereof, if the central portion were used alone as an acoustical unit, would present va more or less uneven or ragged appearance and ⁇ would provide no dem, strong area for nailinrar or similarly securing to a supporting substructure. These disadvantages vare overcome by the edge portions 2. These portions are rigid, preferably impermeable to sound, and integrally united to the central portion on the edges thereof.
  • edge portions establish the thickness of the unit, ⁇
  • the central portion may be composed largely of asbestos paper.
  • asbestos paper contains usually a small proportion of a binder, such as starch, and of cellulosic fibers such as newsprint, say in the proportion of 20 parts by weight of the newsprint to parts of asbestos.
  • the asbestos paper may be thin, weighing, for example, 5 pounds per hundred square feet of the paper.
  • the paper may be provided with irregularities of surface, such as corrugations or indentations, in conventional manner.
  • the sheets comprising the backing and also the facing element may be constructed of the same material as the paper described. These outer sheets, however, are conveniently made somewhat thicker than the sheets within the central portion, say twice as thick, in-order to assist in maintaining the dimensions of the finished unit. 'I'he facing element of type described is sufficiently stiif and strong to be shape-retaining, yet is substantially non-vibratile under the influence of incident sound.
  • the edge sealing and reenforcing elements also are made preferably of the same materials as the central portion, in order that the central portion and the edge sealing members may show the same behavior under changing conditions, such as uniform expansion and contraction with changes in atmospheric humidity.
  • the edge sealing strips may consist of asbestos fibers in the form of millboard. For a unit that is 16 inches square by 1 inch thick, the edge sealing strips may be 1 inch wide from front to back-and I/ Vinch thick. They are suitably joinedat their ends, as in the tongue and groove joint illustrated at I0.
  • the facing element 3 may consist of sheet material of irregular surface, including imperforate, that is, sound-impermeable elevated portions H and portions I2 that are depressed with respect to the elevated portions and that contain openins adapted to admit incident sound.
  • the facing element has the appearance of a modified basket weave structure, with the cross strips omitted, and is provided with slits I3, in the areas intermediate the tops of the elevated portions and the bottoms of the depressed portions.
  • an acoustical unit of the type described there are first provided the component materials such as sheets of plane-surfaced asbestos paper and corrugated asbestos paper, asbestos millboard', and the adhesive that it is desired to use in compositing the various parts. These parts may be put together in convenient manner, as, for example, by hand or by machine.
  • the sheets of paper that are to constitute the central portion are cut to desired size, say 151A x 151A inches.
  • the tops of the corrugations in the corrugated paper are provided with a coating of sodium silicate solution as the adhesive, and there are then formed a number of composites consisting of sheets of plane surface and corrugated surface, of one-ply thickness of each kind of paper.
  • These composited one-ply sheets provided they may appropriate surfaces of the partially formed unit 7 ⁇ 5- are then passed over a pin roll, while being pressed thereagainst, and thus provided with perforations closely spaced and adapted to admit incident sound.
  • the sheets may be pressed against a roller carrying closely spaced piercing pins, say 1%; inch apart.
  • the sheet of plane surface is nearest to the roller during the perforating operation, so that the pins l pierce holes completely through the plane sheet and partly through the adjacent corrugated 10 sheet, particularly through the elevated portions of the corrugated sheet adjacent to the plane sheet.
  • one-ply sheets of the type de- 15 scribed, but not perforated are passed under a gang of closely spaced rotating saws, as, for eX-. ample, saws adapted to cut kerfs nl; inch wide and inch apart.
  • the composite is passed through with the sheet of plane surface turned 2o towards the saws, and the spacing on the sheets with respect to the saws is such that the saw kerfs extend through the plane sheet and divide it into a series of narrow parallel bands but extend only sufficiently far into the corrugated 25 sheet to saw through the tops of the corrugations adjacent to the plane sheet.
  • One-ply composite sheets provided with the sound-permeable openings as described above, are then assembled and adhered together, into a central or body portion of desired thickness, say 1 inch.
  • the adhering is effected by means of adhesive, of type described, applied over the high spots of the corrugations in the several composites of one-ply thickness.
  • Acentral or body portion so made is then united to the edge elements 2.
  • These elements are provided in proper length and'with tongues or grooves at their ends.
  • the edges of the central portion are rst heavily coated with an aque- 40 ous solution of sodium silicate or the like.
  • the edge elements 2 are then oriented properly and forced against the silicated edges of the central portion, to give a firm bond therewith and also to cause the ends of the said edge elements to 45 be joined with each other, as illustrated in the figures.
  • 'I'his may be done by hand or by a device commonly known as a ,bulldozer.
  • distortion of the relatively weak central portion is 50 avoided by rigid plates disposed both above and below the central portion and maintained in position, to prevent bulging of the central portion during the pressing of the strips against the edges thereof. 55
  • the backing sheet is suitably imperforate asbestos paper of plane surface and the facing element' is a sheet having the appearance 60 of a modified basket weave, with slits in the areas intermediate the elevated and depressed portions.
  • the facing element may be yieldable and is made in any convenient manner, as by providing a sheet of asbestos paper with discontinuous, parallel slits and then elevating areas between certain of the slits and depressing the adjacent areas. This may be done by passage of the sheet between coacting rollers, having on their surfaces meshing elevations and depressions and means 70 for cutting slits in the areas intermediate the said elevations and depressions.
  • backing sheets are first formed in long lengths.I and are drawn between spaced rollers, so that the facing sheet rideson one roller and the backing sheet on the other and there is left between the sheetsfspace for feeding therein the incomplete unit comprising the central portion and ad-- hered edge strips.
  • Adhesive is applied to theA inner side'of the backing sheet and to the backs of the depressed portions of the facing sheet before the sheets are passed over the said rollers.
  • the sheets are pressed against the proper surfaces of the unit and are adhered thereto.
  • the unit with adhered facing and backing sheets is then subjected to an voperation to establish approximately uniform thickness thereof, and to setv the unit in final shape and size.
  • the unit may be compressed between steamheated plates maintained at selected distances apart in a hydraulic press and held therein until the moisture present in the unit, including water added with the adhesive, is removed by evaporation.
  • edge strips which are relatively incompressible as compared to the easily crushed central portion, in connection with the spacing of the plates in the press, establish the thickness of .the final unit.
  • the facingelement of the'drid unit may be sprayed or painted over-its surface with a solution of shellac, a phenol-aldehyde product (bakelite) or other suitable stiiening agent.
  • the unit is sized and/or provided with beveled edges as illustrated. For this there may be used cutting wheels of carborundum or the like.
  • Units made as described, in 1inch thickness, have been found to absorb 50 to 65% of incident sound of a frequency of 512 cycles per second.
  • the ⁇ backing or facing elements may be omitted if their functions are not desired.
  • the facing element along with other functions, adds to the desirable appearance of the unitand provides a surface that may be pmnted, as by spraying or brushing, without closing the slits or openings disposed rearwardly with respect to the tops of the elevated portions.
  • An acoustical unit comprising a sound-permeable face, a compressible, sound-absorbing central portion, provided with sound-absorbing spaces communication laterally with each other and with openings communicating with the face of the unit .and adapted to admit incident sound, and rigid, relatively non-compressible, edge portions united to and enclosing the central por- 5 tion at the edges thereof, the said central and edge portions being constructed of the'same materials, whereby they are adapted to contract and expand in unison under changing conditions of atmospheric humidity.
  • An acoustical unit comprising a compress ⁇ ible sound-absorbing central portion, including a plurality of sheets that are relatively ineffective per se in sound absorption, define sound-absorbing spaces betweenthe sheets; and are provided with openings adapted to admit incident sound, rigid, relatively non-compressible, sound-impermeable edge portions united to and enclosing the central portion at the edges thereof, whereby thev thickness of the unit is established and the passage of sound through the edges of the unit is minimized, a yieldable sound-permeable facing sheet extending over and united to the faces of the said central and edge portions, and a soundimpermeable backing sheet extending over and united to the back of the said unit.
  • An acoustical unit comprising a compressible sound-absorbing central portion, including a plurality of porous sheets of felted fibrous material, that a-re relatively ineffective per se in lsound absorption, define sound-absorbing spaces between the sheets, and are provided with openings adapted to admit incident sound, and rigid, relatively non-compressible, sound-impermeable edge portions united to an enclosing the central 35 portion at the edges thereof, the said edge portions being constructed of the same kind of felted fibrous material as the central portion, whereby similar behavior of the two portions under changing conditions of environment is obtained. 4,0 4.
  • An acoustical unit as described in claim 2 including an outer sheet extending over and united to the faces of the central and edge portions of the unit, the said outer sheet. having irregulariyties of surface including elevated portions and portions depressed with respect to the elevated portions and being provided in the lsaid depressed portions with openings adapted to admit incident sound. 4
  • An acoustical unit as described in claim 3 50 comprising a substance of negative capillarity for water, adapted to minimize the absorption of water vapor, impregnated in limited proportion into the said fibrous material, whereby the porosity of the fibrous material is preserved and the tendency thereof to absorb Water-vapor is reduced: f
  • a preformed acoustical unit comprising a face portion, edge strips of asbestos millboard and aA central portion united to the edge strips and bounded thereby and including, in the said central portion, a plurality of composited sheets of alternating plane-surfaced and irregularly surfaced asbestos ;paper, ⁇ defining therebetween sound-absorbing spaces communicating laterally with each other, and being provided with openings communicating with the face of the unit and adapted to admit yincident sound.
  • acoustical unit comprising a face portion, edge strips of asbestos millboard and a central portion united to the edge strips and bounded thereby and including, in the said sound-absorbing spaces communicating laterally with each other, and being provided with openings communicating with the face of the unit and adapted to admit incident sound, the openings in the several sheets of any one kind of surface being in non-registering relationship.
  • a preformed acoustical unit comprising a face portion, edge strips of asbestos millboard and a central portion united to the edge strips and bounded thereby and including, in the said central portion, a plurality of composited sheets of alternating plane-surfaced and corrugated asbestos paper, defining therebetween sound-absorbing spaces communicating laterally with each and bounded thereby and including, in the said central portion, a plurality of composited sheets of alternating plane-surfaced and corrugated asbestos paper, dening therebetween soundabsorbing spaces communicating laterally with each other and being provided with opening communieating with ther face of the unit and adapted to admit incident sound, the corrugations in the several sheets being arranged crosswise with respect to the corrugations in adjacent sheets.
  • An acoustical unit as described in claim 6 including a facing element of asbestos paper forming the outer. sheet of the sound-absorbing element, the facing sheet having imperforate forward portions and portions disposed rearwardly with respect to the forward portions and provided in the said rearwardly disposed portions with openings adapted to admit incident sound.
  • An acoustical unit as described in claim 6 including an imperforate backing element of as bestos paper adhered to the back of the unit and a facing element of asbestos paper forming the outer forward sheet of the sound-absorbing ele ment, the facing sheet having the appearance of a modied basket weave, having imperforate forward portions and portions disposed rearwardly with respect to the forward portions, provided in the said rearwardly disposed portions with openings adapted to admit incident sound, and having a stiffening material applied to the facing sheet with preservation of the said openings.

Description

June 16, 1936. G. B. BROWN 2,043,988
LIGHTWEIGHT UNIT Filed Feb. 28, 1955 INVENToR George Brown QM/ma ATTORNEY Patented June 16, 1936 UNITED STATES PATENT 4OFFICE LrGn'rwEIGH'r UNIT George B. Brown,
J ohns-Manville Somerville, N. J., assignor to Corporation, New York, N. Y.,
11 Claims.
This invention relates toa lightweight unit, particularly a preformed acoustical unit.
' It is an object of the invention to provide an inexpensive but eil'ective, lightweight sound-absorbing or thermal-.insulating unit comprising central and edge portions coacting to increase the strength and rigidity while preserving the overall low density, adaptability, and other desirable properties of the unit, including the appearance thereof. Other objects and advantages will appear as the description of the invention progresses.
Brieily stated, the preferred embodiment of the invention` comprises an 'acoustical unit including a central or body portion of spaced sheets, that are per se relatively ineffective in sound-absorption and that define between them a labyrinth of discontinuously communicating spaces, and rigid edge sealing and reenforcing elements adhered to the central portion, the said edge and centralportions being constructed preferably of the same materials, whereby they are adapted toreact identically under changing conditions of environment. The invention comprises, also, a unit o1' the type described in which the edge sealing elements and also an element applied to the back thereof are sound-impermeable and adapted to minimize the passage of sound and the circulation of air through the edges and back of the unit. Further, the invention comprises an acoustical element including sound-absorbing spaces and parallel, closely spaced, narrow slits connecting the said spaces with each other and with an exterior surface of the element.
'I'he invention is illustrated in the drawing in which:
Fig. l shows a plan view ci acoustical unit, which is in part broken down to show the inner structure of the unit;
Fig. 2 shows an edge view of the unit illustrated in Fig. l;
Fig. 3 shows a cross sectional view on line 3-3 of Fig. l;
Fig. 4 shows a plan View, in part broken away, ci a modiiled form of central portion lor soundabsorbing. element; and
Fig. 5 is a cross sectional Fig. 4.
lin the various figures like denote like parte.
The drawing shows a preformed lightweight unit, particularly adapted for the absorption of sound, comprising a sound-absorbing element constituting the central portion i, and edge seaiing and reeniorcing v.strips or elements 2, in-
of a preferred type T@leur on line 5--5 of reference characters tegrally united, as by sodium silicate adhesive, to the said central portion. The unit is provided with a sound-permeable outer sheet 3, which is really a part of the sound-absorbing structure, but may be herein referred to, for convenience, as the facing element. Also, the unit is provided, at its back, with an outer backing sheet 4 that is preferably sound-impermeable.
The central or body portion l comprises, suitably, composited sheets that are in themselves relatively ineiective in sound-absorption but dene sound-absorbing spaces or passages 5. The .composite includes sheets 6 of irregular surface, alternated with sheets 'I of plane surface. 'Ihe sheets of irregular surface may be corrugated and arranged in the assembly with the corrugations in one sheet extending at an angle, say crosswise, to the corrugations in adjacent sheets. The composited alternating sheets of plane and irregular surface are provided with perforatlons or openings 8, spaced suiiiciently closely to admit incident sound and providing lateral communication between the spaces defined between the sheets.. The perforations in adjacent sheets of the same type of surface may be non-registering. This provision, together with the crossing of thecorrugations in adjacent corrugated sheets, provides for maximum discontinuity of communication between the spaces, and causes sound within the unit to undergo numerous deilections in paths that may be of great length as compared to the wave length of the sound itself.
In the modification shown in Figs. 4 and 5, the openings adapted to admit incident sound are long slits, say saw kerfs 9. In the individual layers, consisting each of a sheet of plane surface and a corrugated sheet adhered thereto, the saw kerfs extend through the sheet of plane surface, to divide it into a plurality of narrow parallel bands, and extend also through the tops of the corrugations on one side of the several corrugated sheets, to cause the numerous spaces defined by the troughs in the corrugated sheet and the plane sheet to communicate with each other.
The central portions are relatively compressihle and non-rigid and have inadequate strength for many purposes. Furthermore, the edges thereof, if the central portion were used alone as an acoustical unit, would present va more or less uneven or ragged appearance and `would provide no dem, strong area for nailinrar or similarly securing to a supporting substructure. These disadvantages vare overcome by the edge portions 2. These portions are rigid, preferably impermeable to sound, and integrally united to the central portion on the edges thereof. The
edge portions establish the thickness of the unit,`
-ous felted fibers of the type of asbestos. Thus,'
the central portion may be composed largely of asbestos paper. Such paper contains usually a small proportion of a binder, such as starch, and of cellulosic fibers such as newsprint, say in the proportion of 20 parts by weight of the newsprint to parts of asbestos. The asbestos paper may be thin, weighing, for example, 5 pounds per hundred square feet of the paper. The paper may be provided with irregularities of surface, such as corrugations or indentations, in conventional manner.
The sheets comprising the backing and also the facing element may be constructed of the same material as the paper described. These outer sheets, however, are conveniently made somewhat thicker than the sheets within the central portion, say twice as thick, in-order to assist in maintaining the dimensions of the finished unit. 'I'he facing element of type described is sufficiently stiif and strong to be shape-retaining, yet is substantially non-vibratile under the influence of incident sound.
The edge sealing and reenforcing elements also are made preferably of the same materials as the central portion, in order that the central portion and the edge sealing members may show the same behavior under changing conditions, such as uniform expansion and contraction with changes in atmospheric humidity. The edge sealing strips may consist of asbestos fibers in the form of millboard. For a unit that is 16 inches square by 1 inch thick, the edge sealing strips may be 1 inch wide from front to back-and I/ Vinch thick. They are suitably joinedat their ends, as in the tongue and groove joint illustrated at I0.
The facing element 3 may consist of sheet material of irregular surface, including imperforate, that is, sound-impermeable elevated portions H and portions I2 that are depressed with respect to the elevated portions and that contain openins adapted to admit incident sound. In the form illustrated, the facing element has the appearance of a modified basket weave structure, with the cross strips omitted, and is provided with slits I3, in the areas intermediate the tops of the elevated portions and the bottoms of the depressed portions.
In making an acoustical unit of the type described, there are first provided the component materials such as sheets of plane-surfaced asbestos paper and corrugated asbestos paper, asbestos millboard', and the adhesive that it is desired to use in compositing the various parts. These parts may be put together in convenient manner, as, for example, by hand or by machine.
The sheets of paper that are to constitute the central portion are cut to desired size, say 151A x 151A inches. The tops of the corrugations in the corrugated paper are provided with a coating of sodium silicate solution as the adhesive, and there are then formed a number of composites consisting of sheets of plane surface and corrugated surface, of one-ply thickness of each kind of paper. These composited one-ply sheets provided, they may appropriate surfaces of the partially formed unit 7`5- are then passed over a pin roll, while being pressed thereagainst, and thus provided with perforations closely spaced and adapted to admit incident sound. For example, the sheets may be pressed against a roller carrying closely spaced piercing pins, say 1%; inch apart. Preferably the sheet of plane surface is nearest to the roller during the perforating operation, so that the pins l pierce holes completely through the plane sheet and partly through the adjacent corrugated 10 sheet, particularly through the elevated portions of the corrugated sheet adjacent to the plane sheet.
If the central unit is to be of the type illustrated `in Figs. 4 and 5, one-ply sheets of the type de- 15 scribed, but not perforated, are passed under a gang of closely spaced rotating saws, as, for eX-. ample, saws adapted to cut kerfs nl; inch wide and inch apart. The composite is passed through with the sheet of plane surface turned 2o towards the saws, and the spacing on the sheets with respect to the saws is such that the saw kerfs extend through the plane sheet and divide it into a series of narrow parallel bands but extend only sufficiently far into the corrugated 25 sheet to saw through the tops of the corrugations adjacent to the plane sheet.
One-ply composite sheets; provided with the sound-permeable openings as described above, are then assembled and adhered together, intoa central or body portion of desired thickness, say 1 inch. The adhering is effected by means of adhesive, of type described, applied over the high spots of the corrugations in the several composites of one-ply thickness.
Acentral or body portion so made is then united to the edge elements 2. These elements are provided in proper length and'with tongues or grooves at their ends. The edges of the central portion are rst heavily coated with an aque- 40 ous solution of sodium silicate or the like. The edge elements 2 are then oriented properly and forced against the silicated edges of the central portion, to give a firm bond therewith and also to cause the ends of the said edge elements to 45 be joined with each other, as illustrated in the figures. 'I'his may be done by hand or by a device commonly known as a ,bulldozer. During thisl uniting of the edges to the central portion, distortion of the relatively weak central portion is 50 avoided by rigid plates disposed both above and below the central portion and maintained in position, to prevent bulging of the central portion during the pressing of the strips against the edges thereof. 55
The central portion with the adhered edges is then provided with the backing and facing sheets. As stated, the backing sheet is suitably imperforate asbestos paper of plane surface and the facing element' is a sheet having the appearance 60 of a modified basket weave, with slits in the areas intermediate the elevated and depressed portions. The facing element may be yieldable and is made in any convenient manner, as by providing a sheet of asbestos paper with discontinuous, parallel slits and then elevating areas between certain of the slits and depressing the adjacent areas. This may be done by passage of the sheet between coacting rollers, having on their surfaces meshing elevations and depressions and means 70 for cutting slits in the areas intermediate the said elevations and depressions. When the facing and backing sheets have been be applied by hand to the staggered, G5V
backing sheets are first formed in long lengths.I and are drawn between spaced rollers, so that the facing sheet rideson one roller and the backing sheet on the other and there is left between the sheetsfspace for feeding therein the incomplete unit comprising the central portion and ad-- hered edge strips. Adhesive is applied to theA inner side'of the backing sheet and to the backs of the depressed portions of the facing sheet before the sheets are passed over the said rollers.
Between the rollers the sheets are pressed against the proper surfaces of the unit and are adhered thereto.
After passage of the assembly from the rollers it is trimmed roughly, as by cutting the facing and backing sheets approximately at the edges of the unit. v
The unit with adhered facing and backing sheets is then subjected to an voperation to establish approximately uniform thickness thereof, and to setv the unit in final shape and size. Thus, the unit may be compressed between steamheated plates maintained at selected distances apart in a hydraulic press and held therein until the moisture present in the unit, including water added with the adhesive, is removed by evaporation.
During this operation the edge strips, which are relatively incompressible as compared to the easily crushed central portion, in connection with the spacing of the plates in the press, establish the thickness of .the final unit.
When it is desired to have a facing element more stiff and rigid than is asbestos paper, the facingelement of the'drid unit may be sprayed or painted over-its surface with a solution of shellac, a phenol-aldehyde product (bakelite) or other suitable stiiening agent.
The thus finished surface is then again dried. Finally, the unit is sized and/or provided with beveled edges as illustrated. For this there may be used cutting wheels of carborundum or the like. f
Since the equipment used in the various steps of the manufacture is not a part of the invention,
it is considered unnecessary to illustrate it.
Units made as described, in 1inch thickness, have been found to absorb 50 to 65% of incident sound of a frequency of 512 cycles per second.
When it is desired to construct such a unit for use as thermal insulation, the procedure outlined may be followed with the exception that lthe perforations, slits or other sound-permeable openings are omitted from the structure.
Likewise, the `backing or facing elements may be omitted if their functions are not desired. lThe facing element, along with other functions, adds to the desirable appearance of the unitand provides a surface that may be pmnted, as by spraying or brushing, without closing the slits or openings disposed rearwardly with respect to the tops of the elevated portions.
The details, that have been given are for the purpose of illustration and not restriction. Variations within the scope of the appended claims may be made without departing from the spirit and scope of the invention.
What -I claim is:
1. An acoustical unit comprising a sound-permeable face, a compressible, sound-absorbing central portion, provided with sound-absorbing spaces communication laterally with each other and with openings communicating with the face of the unit .and adapted to admit incident sound, and rigid, relatively non-compressible, edge portions united to and enclosing the central por- 5 tion at the edges thereof, the said central and edge portions being constructed of the'same materials, whereby they are adapted to contract and expand in unison under changing conditions of atmospheric humidity.
2.l An acoustical unit comprising a compress` ible sound-absorbing central portion, including a plurality of sheets that are relatively ineffective per se in sound absorption, define sound-absorbing spaces betweenthe sheets; and are provided with openings adapted to admit incident sound, rigid, relatively non-compressible, sound-impermeable edge portions united to and enclosing the central portion at the edges thereof, whereby thev thickness of the unit is established and the passage of sound through the edges of the unit is minimized, a yieldable sound-permeable facing sheet extending over and united to the faces of the said central and edge portions, and a soundimpermeable backing sheet extending over and united to the back of the said unit.
3. An acoustical unit comprising a compressible sound-absorbing central portion, including a plurality of porous sheets of felted fibrous material, that a-re relatively ineffective per se in lsound absorption, define sound-absorbing spaces between the sheets, and are provided with openings adapted to admit incident sound, and rigid, relatively non-compressible, sound-impermeable edge portions united to an enclosing the central 35 portion at the edges thereof, the said edge portions being constructed of the same kind of felted fibrous material as the central portion, whereby similar behavior of the two portions under changing conditions of environment is obtained. 4,0 4. An acoustical unit as described in claim 2 including an outer sheet extending over and united to the faces of the central and edge portions of the unit, the said outer sheet. having irregulariyties of surface including elevated portions and portions depressed with respect to the elevated portions and being provided in the lsaid depressed portions with openings adapted to admit incident sound. 4
5. An acoustical unit as described in claim 3 50 comprising a substance of negative capillarity for water, adapted to minimize the absorption of water vapor, impregnated in limited proportion into the said fibrous material, whereby the porosity of the fibrous material is preserved and the tendency thereof to absorb Water-vapor is reduced: f
`6. A preformed acoustical unit comprising a face portion, edge strips of asbestos millboard and aA central portion united to the edge strips and bounded thereby and including, in the said central portion, a plurality of composited sheets of alternating plane-surfaced and irregularly surfaced asbestos ;paper,` defining therebetween sound-absorbing spaces communicating laterally with each other, and being provided with openings communicating with the face of the unit and adapted to admit yincident sound.
'7.'A preformed acoustical unit comprising a face portion, edge strips of asbestos millboard and a central portion united to the edge strips and bounded thereby and including, in the said sound-absorbing spaces communicating laterally with each other, and being provided with openings communicating with the face of the unit and adapted to admit incident sound, the openings in the several sheets of any one kind of surface being in non-registering relationship.
8. A preformed acoustical unit comprising a face portion, edge strips of asbestos millboard and a central portion united to the edge strips and bounded thereby and including, in the said central portion, a plurality of composited sheets of alternating plane-surfaced and corrugated asbestos paper, defining therebetween sound-absorbing spaces communicating laterally with each and bounded thereby and including, in the said central portion, a plurality of composited sheets of alternating plane-surfaced and corrugated asbestos paper, dening therebetween soundabsorbing spaces communicating laterally with each other and being provided with opening communieating with ther face of the unit and adapted to admit incident sound, the corrugations in the several sheets being arranged crosswise with respect to the corrugations in adjacent sheets.
10. An acoustical unit as described in claim 6 including a facing element of asbestos paper forming the outer. sheet of the sound-absorbing element, the facing sheet having imperforate forward portions and portions disposed rearwardly with respect to the forward portions and provided in the said rearwardly disposed portions with openings adapted to admit incident sound.
1l, An acoustical unit as described in claim 6 including an imperforate backing element of as bestos paper adhered to the back of the unit and a facing element of asbestos paper forming the outer forward sheet of the sound-absorbing ele ment, the facing sheet having the appearance of a modied basket weave, having imperforate forward portions and portions disposed rearwardly with respect to the forward portions, provided in the said rearwardly disposed portions with openings adapted to admit incident sound, and having a stiffening material applied to the facing sheet with preservation of the said openings.
GEORGE B. BROWN.
US658937A 1932-07-21 1933-02-28 Lightweight unit Expired - Lifetime US2043988A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US623799A US2132642A (en) 1932-07-21 1932-07-21 Sound absorbing unit
US623731A US2043987A (en) 1932-07-21 1932-07-21 Structural unit
US658937A US2043988A (en) 1932-07-21 1933-02-28 Lightweight unit
BE398436D BE398436A (en) 1932-07-21 1933-08-02
FR762525D FR762525A (en) 1932-07-21 1933-08-31 Improvements to sound dampening elements and their manufacturing process

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US623799A US2132642A (en) 1932-07-21 1932-07-21 Sound absorbing unit
US623731A US2043987A (en) 1932-07-21 1932-07-21 Structural unit
US658937A US2043988A (en) 1932-07-21 1933-02-28 Lightweight unit
BE398436T 1933-08-02
FR762525T 1933-08-31

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US623731A Expired - Lifetime US2043987A (en) 1932-07-21 1932-07-21 Structural unit
US658937A Expired - Lifetime US2043988A (en) 1932-07-21 1933-02-28 Lightweight unit

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US3384199A (en) * 1965-08-13 1968-05-21 Oliver C. Eckel Acoustical control apparatus
US3466019A (en) * 1967-08-04 1969-09-09 Ronald Priestley Gas-liquid contact packing sheets
US3483944A (en) * 1966-09-09 1969-12-16 John W Handy Jr Acoustic structure
US3661721A (en) * 1971-02-05 1972-05-09 Pactide Corp Compact multistage distillation apparatus having stacked microporous membranes and impermeable films
US4886696A (en) * 1988-05-10 1989-12-12 Manville Corporation Corrugated paperboard automotive liner
US5057176A (en) * 1988-05-10 1991-10-15 Manville Corporation Method of forming corrugated paperboard automotive liner
US5225622A (en) * 1990-06-19 1993-07-06 Guy L. Gettle Acoustic/shock wave attenuating assembly
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US20070034445A1 (en) * 2005-08-02 2007-02-15 Michel Pompei Acoustic panel of the air sheet type
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Cited By (14)

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Publication number Priority date Publication date Assignee Title
US3384199A (en) * 1965-08-13 1968-05-21 Oliver C. Eckel Acoustical control apparatus
US3380206A (en) * 1965-09-29 1968-04-30 Soundlock Corp Lay-in acoustical ceiling panel with flexible diaphragms
US3483944A (en) * 1966-09-09 1969-12-16 John W Handy Jr Acoustic structure
US3466019A (en) * 1967-08-04 1969-09-09 Ronald Priestley Gas-liquid contact packing sheets
US3661721A (en) * 1971-02-05 1972-05-09 Pactide Corp Compact multistage distillation apparatus having stacked microporous membranes and impermeable films
US5057176A (en) * 1988-05-10 1991-10-15 Manville Corporation Method of forming corrugated paperboard automotive liner
US4886696A (en) * 1988-05-10 1989-12-12 Manville Corporation Corrugated paperboard automotive liner
US5225622A (en) * 1990-06-19 1993-07-06 Guy L. Gettle Acoustic/shock wave attenuating assembly
US20070000467A1 (en) * 2005-07-01 2007-01-04 Visteon Global Technologies, Inc. Noise attenuation device for an air induction system
US7207310B2 (en) * 2005-07-01 2007-04-24 Visteon Global Technologies, Inc. Noise attenuation device for an air induction system
US20070034445A1 (en) * 2005-08-02 2007-02-15 Michel Pompei Acoustic panel of the air sheet type
US20090090580A1 (en) * 2006-05-24 2009-04-09 Airbus Deutschland Gmbh Sandwich Element for the Sound-Absorbing Inner Cladding of Means of Transport, Especially for the Sound-Absorbing Inner Cladding of Aircraft
US20110100747A1 (en) * 2006-05-24 2011-05-05 Airbus Operations Gmbh Sandwich element for the sound-absorbing inner cladding of means of transport, especially for the sound-absorbing inner cladding of aircraft
US8251175B1 (en) 2011-04-04 2012-08-28 Usg Interiors, Llc Corrugated acoustical panel

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FR762525A (en) 1934-04-11
BE398436A (en) 1933-09-30
US2132642A (en) 1938-10-11
US2043987A (en) 1936-06-16

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