US3920872A - Carpet-faced wallboard - Google Patents
Carpet-faced wallboard Download PDFInfo
- Publication number
- US3920872A US3920872A US52800374A US3920872A US 3920872 A US3920872 A US 3920872A US 52800374 A US52800374 A US 52800374A US 3920872 A US3920872 A US 3920872A
- Authority
- US
- United States
- Prior art keywords
- fiberboard
- carpet
- adhesive
- latex
- coating
- 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.)
- Expired - Lifetime
Links
- 239000011094 fiberboard Substances 0.000 claims abstract description 54
- 239000000463 material Substances 0.000 claims abstract description 43
- 239000000853 adhesive Substances 0.000 claims description 39
- 230000001070 adhesive effect Effects 0.000 claims description 39
- 239000011248 coating agent Substances 0.000 claims description 19
- 238000000576 coating method Methods 0.000 claims description 19
- 239000004816 latex Substances 0.000 claims description 15
- 229920000126 latex Polymers 0.000 claims description 13
- 230000001788 irregular Effects 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 2
- 239000002585 base Substances 0.000 description 16
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000010440 gypsum Substances 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 229920002522 Wood fibre Polymers 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002025 wood fiber Substances 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- KEQFTVQCIQJIQW-UHFFFAOYSA-N N-Phenyl-2-naphthylamine Chemical compound C=1C=C2C=CC=CC2=CC=1NC1=CC=CC=C1 KEQFTVQCIQJIQW-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerol Substances OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/10—Next to a fibrous or filamentary layer
-
- E—FIXED CONSTRUCTIONS
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
- B32B19/06—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/02—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
- B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
- E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
- E04F13/16—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements of fibres or chips, e.g. bonded with synthetic resins, or with an outer layer of fibres or chips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2315/00—Other materials containing non-metallic inorganic compounds not provided for in groups B32B2311/00 - B32B2313/04
- B32B2315/14—Mineral wool
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- E—FIXED CONSTRUCTIONS
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- 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
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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
- E04B2001/8457—Solid slabs or blocks
- E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/74—Removable non-load-bearing partitions; Partitions with a free upper edge
- E04B2002/7483—Details of furniture, e.g. tables or shelves, associated with the partitions
- E04B2002/7485—Load supports therefor placed between wall studs
-
- 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
- Y10T428/23907—Pile or nap type surface or component
- Y10T428/23979—Particular backing structure or composition
-
- 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
- Y10T428/23907—Pile or nap type surface or component
- Y10T428/23986—With coating, impregnation, or bond
-
- 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
- Y10T428/24331—Composite web or sheet including nonapertured component
-
- 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.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/2481—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including layer of mechanically interengaged strands, strand-portions or strand-like strips
-
- 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
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- Y10T428/24826—Spot bonds connect 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.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24851—Intermediate layer is discontinuous or differential
Definitions
- ABSTRACT A carpet material is applied to a fiberboard which has [52] US. Cl. 428/95; l81/33 G; 181/336 A; been provided with acoustical openings.
- the carpet is 428/96; 428/196; 428/198; 428/201; adhesively bonded to the fiberboard in such a manner 428/ 138; 428/317 as to prevent the obstruction of the entrances of the [51] Int. Cl. D0411 11/00; DOSC 17/00 acoustical openings in the fiberboard.
- the carpet- [58] Field of Search 428/85, 94, 95, 96, 196, covered fiberboard is utilized as a wallboard.
- the invention herein is directed to a carpet-faced fiberboard and, more particularly, to an acoustical wallboard which is covered with a carpet facing.
- carpeting As a covering for walls.
- the carpeting would either be hung on the wall or permanently affixed to the wall.
- the invention herein is directed to the use of a carpet on a perforated acoustical fiberboard which will provide a wallboard structure of improved sound absorption characteristics.
- the carpet is carefully mounted on the perforated fiberboard so as not to obstruct the perforation openings in the fiberboard to maintain the sound absorbing ability of the fiberboard structure.
- a conventional fiberboard structure is utilized as the base for the wallboard invention herein.
- This fiberboard structure may be any of the conventional mineral wool or wood fiber panel structures which are currently available on the open market.
- the base structure is provided with a perforated surface wherein the perforations in the surface provide acoustical pockets to increase the sound absorption ability of the base structure surface.
- An adhesive coating is placed upon the perforated surface in such a manner as not to close over the perforation openings on the base surface.
- a carpet material is provided with a latex tie coat on the back surface thereof. The latex tie coat is placed on the carpet surface to provide a discontinuous film on the back of the carpet surface. The carpet material is applied to the perforated surface of the base material, and the adhesive on the base material and the tie coat on the carpet backing bond the base material and carpet facing together to form the carpet-faced fiberboard which is now capable of being used as a wallboard.
- the board structure is provided with a very pleasing decorative effect and is quite capable of being mounted directly to a wall structure or being used as a free-standing dividing wall.
- FIG. I is a perspective view of the wallboard invention herein;
- FIG. II is a cross-sectional view of a portion of the wallboard structure of FIG. I.
- the invention herein is directed to a wallboard structure 2 which is composed of a base structure or board 4, which is a fiberboard structure, and a carpet facing 6 placed on the surface of the board 4.
- the fiberboard or base board material can be any conventional fiberboard structure made of either mineral wool or wood fiber material.
- the fibers of the board are bound together by appropriate binder material.
- Typical of the boards which could be used are the boards which are sold under the Armstrong trademarks Minaboard or Trilon. These are fiberboard structures of approximately /2 inch in thickness and are of relatively dense fiberboard material with a substantial degree of rigidity. Almost any base material could be used including plywood.
- the base material 4 is provided with a plurality of acoustical perforations 8. These perforations extend from one surface 10 of the board structure into the board structure. The perforations act as sound pockets for absorbing sound which is directed against the surface 10 of the board.
- the board shown with its perforations is exactly the same as the conventional acoustical ceiling boards which are installed in many building structures, particularly in suspended ceilings.
- the carpet material is a nylon or like-type carpet material which is composed of a plurality of fibers which have been needled together by the conventional needle-bonded technique which is used for forming the socalled indoor-outdoor carpeting which was initially made famous by the Ozite Corporation.
- the carpet material is approximately 42-inch thick and is very similar in nature to a heavy felted material.
- the surface 10 of the base material board is roll coated with an adhesive which is placed on the surface 10 at a very low application rate so that the adhesive 12 does not bridge the openings of the perforations 8. Consequently, after the application of the adhesive 12 to the surface 10 of the base material 4, the perforations will still all be exposed to view and will be unobstructed by an adhesive.
- the back of the carpet material is sprayed with a conventional latex tie coat which is normally applied to carpet materials to bond the needle-bonded carpet material to an appropriate backing material.
- the tie coat is sprayed on the carpet to provide a very light application of the tie coat to the carpet as a discontinuous coating to the back of the carpet; that is, continuous film of tie coat material is not applied to the back of the carpet.
- the carpet is actually sprayed with dots of adhesive to provide a discontinuous coating 14 on the back of the carpet 6.
- a continuous length of carpet having a tie coat applied on the back thereof is applied to sheets of fiberboard 4 which are fed under the carpet material.
- the back of the carpet material containing the tie coat 14 is pressed against the adhesive-coated surface 10 of the fiberboard 4 to bond the carpet to the fiberboard 4.
- the carpet is wrapped partly around the edge of the fiberboard to give a neat edge to the finished product.
- the carpet is cut off from the continuous length of carpet at the end of each fiberboard to provide panel structures which are normally 4 feet by 8 feet in size.
- Due to the discontinuous nature of the tie coat l4 and the adhesive coat 12 the perforations 8 are open to the back of the carpet fabric 6. Consequently, sound waves impinging against the surface of the carpet will be transmitted through the carpet to the perforations in the base board. This will result in not only absorption of sound within the carpet structure, but also absorption of sound by the perforations within the base structure 4.
- a decorative board structure having very good absorption and low sound transmission.
- the structure is quite capable of being mounted directly upon a wall structure, or it could be used as a free-standing wall divider.
- the adhesive coating which is applied to the carpet back is a conventional latex tie coat such as is used in the carpet industry.
- a conventional tie coat material is as follows:
- the base material 4 has a flat surface 10 on which the adhesive 12 is applied as a film.
- the carpet 6, as clearly shown in FIG. ll, does not have a flat back, but has an irregular or rough back surface.
- a wallboard structure which is composed of a rigid fiberboard base having on one surface thereof a plurality of perforations therein, an adhesive coating applied at a very low application rate to the surface of the fiberboard in such a manner as to not close over any of the perforation openings in the fiberboard, and a carpet material which is approximately /s inch thick and which is composed of a plurality of needle-bonded fibers, the back surface of the carpet material, which is placed adjacent the adhesive-coated surface of the fiberboard, being an irregular surface and having a discontinuous coating of latex adhesive applied thereto in the form of dots of adhesive, said latex-coated surface of the carpet material being placed adjacent the adhesive coating of the fiberboard structure whereby the latex coating on the carpet and the adhesive coating on the fiberboard bond the carpet material to the fiberboard, the perforations of the fiberboard in the fiberboard-carpet material combination not having their openings bridged by either the adhesive coating of the fiberboard or the latex coating of the carpet so as to close off these openings which provide the carpet-covered
- the composite structure is composed of a fiberboard base, a carpet material and therebetween an adhesive bond which is in two parts, the one part of the adhesive bond being dots of latex adhesive adhering to the irregular back of the carpet surface and the second part of the adhesive bond, and the second part of the adhesive bond being a film of adhesive fastening the rigid fiberboard to the dots of latex adhesive.
Abstract
A carpet material is applied to a fiberboard which has been provided with acoustical openings. The carpet is adhesively bonded to the fiberboard in such a manner as to prevent the obstruction of the entrances of the acoustical openings in the fiberboard. The carpet-covered fiberboard is utilized as a wallboard.
Description
United States Patent Ollinger Nov. 18, 1975 4] CARPET-FACED WALLBOAlRD [75] Inventor: James C. Ollinger, Lancaster, Pa. [56] References Cited [73] Assignee: Armstrong Cork Company, UNITED STATES PATENTS Lancaster, Pa. 2,246,040 6/l94l Guild 181/33 3,444,956 5/l969 Gaffney Flledl 29, 1974 3.706,!71 12/1972 Shayman 52/475 [21] Appl. No.: 528,003
' E; '-M' E.MC' 'h Related Us. Application Data Prmzar \am1ne1 anon c amis [63] Continuation of Ser. No. 305,471, Nov. 10, 1972.
abandoned. [57] ABSTRACT A carpet material is applied to a fiberboard which has [52] US. Cl. 428/95; l81/33 G; 181/336 A; been provided with acoustical openings. The carpet is 428/96; 428/196; 428/198; 428/201; adhesively bonded to the fiberboard in such a manner 428/ 138; 428/317 as to prevent the obstruction of the entrances of the [51] Int. Cl. D0411 11/00; DOSC 17/00 acoustical openings in the fiberboard. The carpet- [58] Field of Search 428/85, 94, 95, 96, 196, covered fiberboard is utilized as a wallboard.
428/198, 200, 201, 304, 317, l37, l38; 4 2 Dr 181/33 G, 336 A C aims, awmg lgures US. Patent Nov. 18, 1975 CARPET-FACED WALLBOARD CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation of application Ser. No. 305,471, filed Nov. 10, 1972 by James C. Ollinger and entitled Carpet-Faced Wallboard and now abandoned.
BACKGROUND OF THE INVENTION 1. Field of the Invention The invention herein is directed to a carpet-faced fiberboard and, more particularly, to an acoustical wallboard which is covered with a carpet facing.
2. Description of the Prior Art Installation of carpet material to walls or ceilings requires complicated techniques by specialized craftsmen. It would be desirable to make carpeting available as a wallboard material of the same dimension as presently marketed gypsum wallboard so that it could be substituted directly for gypsum wallboard in wall and ceiling systems. Application to solid walls or studs could be by means of an adhesive system.-
It is not unusual in many countries to use carpeting as a covering for walls. The carpeting would either be hung on the wall or permanently affixed to the wall.
US. Pat. Nos. 2,369,658 and 2,839,442 disclose panel structures wherein a carpet-like structure is placed upon a panel structure.
The invention herein is directed to the use of a carpet on a perforated acoustical fiberboard which will provide a wallboard structure of improved sound absorption characteristics. The carpet is carefully mounted on the perforated fiberboard so as not to obstruct the perforation openings in the fiberboard to maintain the sound absorbing ability of the fiberboard structure.
SUMMARY OF THE INVENTION A conventional fiberboard structure is utilized as the base for the wallboard invention herein. This fiberboard structure may be any of the conventional mineral wool or wood fiber panel structures which are currently available on the open market. The base structure is provided with a perforated surface wherein the perforations in the surface provide acoustical pockets to increase the sound absorption ability of the base structure surface. An adhesive coating is placed upon the perforated surface in such a manner as not to close over the perforation openings on the base surface. A carpet material is provided with a latex tie coat on the back surface thereof. The latex tie coat is placed on the carpet surface to provide a discontinuous film on the back of the carpet surface. The carpet material is applied to the perforated surface of the base material, and the adhesive on the base material and the tie coat on the carpet backing bond the base material and carpet facing together to form the carpet-faced fiberboard which is now capable of being used as a wallboard.
There is provided a wallboard structure with improved sound absorption features over conventional gypsum or wood wallboards. The board structure is provided with a very pleasing decorative effect and is quite capable of being mounted directly to a wall structure or being used as a free-standing dividing wall.
BRIEF DESCRIPTION OF THE DRAWING FIG. I is a perspective view of the wallboard invention herein; and
FIG. II is a cross-sectional view of a portion of the wallboard structure of FIG. I.
DESCRIPTION OF THE PREFERRED EMBODIMENT The invention herein is directed to a wallboard structure 2 which is composed of a base structure or board 4, which is a fiberboard structure, and a carpet facing 6 placed on the surface of the board 4.
The fiberboard or base board material can be any conventional fiberboard structure made of either mineral wool or wood fiber material. The fibers of the board are bound together by appropriate binder material. Typical of the boards which could be used are the boards which are sold under the Armstrong trademarks Minaboard or Trilon. These are fiberboard structures of approximately /2 inch in thickness and are of relatively dense fiberboard material with a substantial degree of rigidity. Almost any base material could be used including plywood. The base material 4 is provided with a plurality of acoustical perforations 8. These perforations extend from one surface 10 of the board structure into the board structure. The perforations act as sound pockets for absorbing sound which is directed against the surface 10 of the board. The board shown with its perforations is exactly the same as the conventional acoustical ceiling boards which are installed in many building structures, particularly in suspended ceilings.
The carpet material is a nylon or like-type carpet material which is composed of a plurality of fibers which have been needled together by the conventional needle-bonded technique which is used for forming the socalled indoor-outdoor carpeting which was initially made famous by the Ozite Corporation. The carpet material is approximately 42-inch thick and is very similar in nature to a heavy felted material.
The surface 10 of the base material board is roll coated with an adhesive which is placed on the surface 10 at a very low application rate so that the adhesive 12 does not bridge the openings of the perforations 8. Consequently, after the application of the adhesive 12 to the surface 10 of the base material 4, the perforations will still all be exposed to view and will be unobstructed by an adhesive. The back of the carpet material is sprayed with a conventional latex tie coat which is normally applied to carpet materials to bond the needle-bonded carpet material to an appropriate backing material. The tie coat is sprayed on the carpet to provide a very light application of the tie coat to the carpet as a discontinuous coating to the back of the carpet; that is, continuous film of tie coat material is not applied to the back of the carpet. The carpet is actually sprayed with dots of adhesive to provide a discontinuous coating 14 on the back of the carpet 6.
A continuous length of carpet having a tie coat applied on the back thereof is applied to sheets of fiberboard 4 which are fed under the carpet material. The back of the carpet material containing the tie coat 14 is pressed against the adhesive-coated surface 10 of the fiberboard 4 to bond the carpet to the fiberboard 4. Normally the carpet is wrapped partly around the edge of the fiberboard to give a neat edge to the finished product. The carpet is cut off from the continuous length of carpet at the end of each fiberboard to provide panel structures which are normally 4 feet by 8 feet in size. Due to the discontinuous nature of the tie coat l4 and the adhesive coat 12, the perforations 8 are open to the back of the carpet fabric 6. Consequently, sound waves impinging against the surface of the carpet will be transmitted through the carpet to the perforations in the base board. This will result in not only absorption of sound within the carpet structure, but also absorption of sound by the perforations within the base structure 4.
Consequently, there is provided a decorative board structure having very good absorption and low sound transmission. The structure is quite capable of being mounted directly upon a wall structure, or it could be used as a free-standing wall divider.
The adhesive coating which is applied to the carpet back is a conventional latex tie coat such as is used in the carpet industry. A conventional tie coat material is as follows:
Parts by weight Carboxylated Styrene Butadicne Rubber latex 500 Tetrasodium Pyrophosphate dispersant 2 Paragum l04 thickener. sodium polyacrylate Aluminum Trihydratc fire retardant 500 Water 500 Parts by Weight Solvent-toluol 148 Resin-Hercules Polypulc lO-glycerol ester of polymerized rosin 220 Resin-Diamond alkali Chloroway 70Chlorinatcd paraffin 220 Neoprene-Du Pont-polychloroprcne (58% solids) 763 Anti-oxidant-Du Pont Neozone DN-phcnyl-betanaphthylamine 13 Water 340 This is applied to the board structure by either roll coating or spraying at a coverage rate of about 10 grams per square foot.
As is obvious from FIG. I and FIG. ll of the drawing,
the base material 4 has a flat surface 10 on which the adhesive 12 is applied as a film. However, the carpet 6, as clearly shown in FIG. ll, does not have a flat back, but has an irregular or rough back surface.
What is claimed is:
l. A wallboard structure which is composed of a rigid fiberboard base having on one surface thereof a plurality of perforations therein, an adhesive coating applied at a very low application rate to the surface of the fiberboard in such a manner as to not close over any of the perforation openings in the fiberboard, and a carpet material which is approximately /s inch thick and which is composed of a plurality of needle-bonded fibers, the back surface of the carpet material, which is placed adjacent the adhesive-coated surface of the fiberboard, being an irregular surface and having a discontinuous coating of latex adhesive applied thereto in the form of dots of adhesive, said latex-coated surface of the carpet material being placed adjacent the adhesive coating of the fiberboard structure whereby the latex coating on the carpet and the adhesive coating on the fiberboard bond the carpet material to the fiberboard, the perforations of the fiberboard in the fiberboard-carpet material combination not having their openings bridged by either the adhesive coating of the fiberboard or the latex coating of the carpet so as to close off these openings which provide the carpet-covered fiberboard structure with good acoustical properties.
2. The structure of claim 1 wherein the composite structure is composed of a fiberboard base, a carpet material and therebetween an adhesive bond which is in two parts, the one part of the adhesive bond being dots of latex adhesive adhering to the irregular back of the carpet surface and the second part of the adhesive bond, and the second part of the adhesive bond being a film of adhesive fastening the rigid fiberboard to the dots of latex adhesive.
3. A wallboard structure as set forth in claim 2 wherein the perforations in one surface of the rigid fiberboard extend from one surface into the board structure, but not through the board structure.
4. The wallboard structure of claim 3 wherein the carpet material is wrapped partly around the end of the rigid fiberboard.
Claims (4)
1. A WALLBOARD STRUCTURE WHICH IS COMPOSED OF A RIGID FIBERBOARD BASE HAVING ON ONE SURFACE THEREOF A PLURALITY OF PERFORATIONS THEREIN, AN ADHESIVE COATING APPLIED AT A VERY LOW APPLICATION RATE TO THE SURFACE OF THE FIBERBOARD IN SUCH A MANNER AS TO NOT CLOSE OVER ANY OF THE PERFORATION OPENINGS IN THE FIBERBOARD, AND A CARPET MATERIAL WHICH IS APPROXIMATELY 1/8 INCH THICK AND WHICH IS COMPOSED OF A PLUTALITY OF NEEDLE-BONDED FIBERS, THE BACK SURFACE OF THE CARPET MATERIAL, WHICH IS PLACED ADJACENT THE ADHESIVE-COATED SURFACE OF THE FIBERBOARD, BEING AN IRREGULAR SURFACE AND HAVING A DISCONTINUOUS COATING OF LATEX ADHESIVE APPLIED THERETO IN THE FORM OF DOTS OF ADHESIVE, SAID LATEX-COATED SURFACE OF THE CARPET MATEREAL BEING PLACED ADJACENT THE ADHESIVE COATING OF THE FIBERBOARD STRUCTURE WHEREBY THE LATEX COATING ON THE CARPET AND THE ADHESIVE COATING OF THE FIBERBOARD BOND THE CARPET MATERIAL TO THE FIBERBOARD, THE PERFORATIONS OF THE FIBERBOARD IN THE FIBERBOARD-CARPET MATERIAL COMBINATION NOT HAVING THEIR OPENINGS BRIDGED BY EITHER THE ADHESIVE COATING OF THE FIBERBOARD OR THE LATEX COATING OF THE CARPET SO AS TO CLOSE OFF THESE OPENINGS WHICH PROVIDE THE CARPET-COVERED FIBERBOARD STRUCTURE WITH GOOD ACOUSTICAL PROPERTIES.
2. The structure of claim 1 wherein the composite structure is composed of a fiberboard base, a carpet material and therebetween an adhesive bond which is in two parts, the one part of the adhesive bond being dots of latex adhesive adhering to the irregular back of the carpet surface and the second part of the adhesive bond, and the second part of the adhesive bond being a film of adhesive fastening the rigid fiberboard to the dots of latex adhesive.
3. A wallboard structure as set forth in claim 2 wherein the perforations in one surface of the rigid fiberboard extend from one surface into the board structure, but not through the board structure.
4. The wallboard structure of claim 3 wherein the carpet material is wrapped partly around the end of the rigid fiberboard.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA183,232A CA991375A (en) | 1972-11-10 | 1973-10-12 | Carpet-faced wallboard |
GB4961573A GB1453445A (en) | 1972-11-10 | 1973-10-24 | Carpet-faced board |
DE2356081A DE2356081C3 (en) | 1972-11-10 | 1973-11-09 | Sound absorbing wall cladding |
US52800374 US3920872A (en) | 1972-11-10 | 1974-11-29 | Carpet-faced wallboard |
DE19752553391 DE2553391A1 (en) | 1972-11-10 | 1975-11-27 | WALL CLADDING COVERED WITH CARPET |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US30547172A | 1972-11-10 | 1972-11-10 | |
US52800374 US3920872A (en) | 1972-11-10 | 1974-11-29 | Carpet-faced wallboard |
Publications (1)
Publication Number | Publication Date |
---|---|
US3920872A true US3920872A (en) | 1975-11-18 |
Family
ID=26974621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US52800374 Expired - Lifetime US3920872A (en) | 1972-11-10 | 1974-11-29 | Carpet-faced wallboard |
Country Status (4)
Country | Link |
---|---|
US (1) | US3920872A (en) |
CA (1) | CA991375A (en) |
DE (2) | DE2356081C3 (en) |
GB (1) | GB1453445A (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4005539A (en) * | 1974-04-04 | 1977-02-01 | Signco Limited | Peg boards |
US4090537A (en) * | 1977-02-16 | 1978-05-23 | Bollman Clifford J | Unitary, composite, multi-layer work area |
US4211302A (en) * | 1976-02-03 | 1980-07-08 | Recourt Martyn Elizabeth De | Sound absorbing device |
US4211303A (en) * | 1976-02-03 | 1980-07-08 | Recourt Martyn Elizabeth De | Sound absorbing device |
US4211304A (en) * | 1976-02-03 | 1980-07-08 | Recourt Martyn Elizabeth De | Sound absorbing device |
US4222803A (en) * | 1978-06-05 | 1980-09-16 | Armstrong Cork Company | Method of making fabric covered ceiling board |
FR2465590A1 (en) * | 1979-09-21 | 1981-03-27 | Armstrong World Ind Inc | FABRIC COATED WALL PANEL |
US4277527A (en) * | 1977-10-03 | 1981-07-07 | Polylok Corporation | Wall construction material comprising a rigid support with a textile material facing laminated thereto |
EP0040657A1 (en) * | 1980-05-27 | 1981-12-02 | Carl Matthews | Acoustic energy absorbing device and method, and exhaust systems and air-conditioning or heating ducts containing said device |
US4574915A (en) * | 1983-12-21 | 1986-03-11 | Dr. Alois Stankiewicz Gmbh | Sound barriers |
US4711685A (en) * | 1982-07-06 | 1987-12-08 | Usg Acoustical Products Company | Soft textured reveal edge ceiling board and process for its manufacture |
US4825974A (en) * | 1986-07-18 | 1989-05-02 | Dr. Alois Stankiewicz Gmbh | Adhesive insulation system |
US5153048A (en) * | 1990-03-02 | 1992-10-06 | Armstrong World Industries, Inc. | Fabric covered corrugated board |
US5198278A (en) * | 1990-07-10 | 1993-03-30 | Duskin Co., Ltd. | Service mat with differential bonding between backing and base cloth |
KR100395309B1 (en) * | 2000-10-18 | 2003-08-21 | 조춘남 | Cork carpet by the method and cork carpet manufacture method |
US20070292655A1 (en) * | 2006-06-19 | 2007-12-20 | Lear Corporation | Tuft coating |
US8968502B1 (en) * | 2009-11-06 | 2015-03-03 | John H. Bearden | Method for coating a tufted athletic turf backing |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2930123A1 (en) * | 1979-07-25 | 1981-02-12 | Wilhelmi Holzwerk | SOUND-absorbing building board |
DE3242940A1 (en) * | 1982-11-20 | 1984-05-24 | Hans Julius 6303 Hungen Schmitt | ACOUSTICALLY EFFECTIVE COMPONENT |
DE3643481A1 (en) * | 1986-05-14 | 1987-11-19 | Pape Hans | SOUND ABSORPTION COATING OF AN ACOUSTIC WALL OR ACOUSTIC CEILING |
DE3643480A1 (en) * | 1986-12-19 | 1988-07-07 | Pape Hans | SOUND ABSORBING WALL OR CEILING COVERING |
DE3800779A1 (en) * | 1987-08-21 | 1989-03-02 | Dura Tufting Gmbh | DEFORMABLE TEXTILE SURFACE FOR LINING NOISED ROOMS AND METHOD FOR THE PRODUCTION THEREOF |
US5170603A (en) * | 1990-12-27 | 1992-12-15 | Construction Specialties, Inc. | Wall panel system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2246040A (en) * | 1937-12-22 | 1941-06-17 | Guild Lurelle | Laminated pile fabric structure |
US3444956A (en) * | 1966-02-08 | 1969-05-20 | Conwed Corp | Foam surfaced acoustical body |
US3706171A (en) * | 1971-04-02 | 1972-12-19 | Harry I Shayman | Decorative acoustical ceiling panel |
-
1973
- 1973-10-12 CA CA183,232A patent/CA991375A/en not_active Expired
- 1973-10-24 GB GB4961573A patent/GB1453445A/en not_active Expired
- 1973-11-09 DE DE2356081A patent/DE2356081C3/en not_active Expired
-
1974
- 1974-11-29 US US52800374 patent/US3920872A/en not_active Expired - Lifetime
-
1975
- 1975-11-27 DE DE19752553391 patent/DE2553391A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2246040A (en) * | 1937-12-22 | 1941-06-17 | Guild Lurelle | Laminated pile fabric structure |
US3444956A (en) * | 1966-02-08 | 1969-05-20 | Conwed Corp | Foam surfaced acoustical body |
US3706171A (en) * | 1971-04-02 | 1972-12-19 | Harry I Shayman | Decorative acoustical ceiling panel |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4005539A (en) * | 1974-04-04 | 1977-02-01 | Signco Limited | Peg boards |
US4211302A (en) * | 1976-02-03 | 1980-07-08 | Recourt Martyn Elizabeth De | Sound absorbing device |
US4211303A (en) * | 1976-02-03 | 1980-07-08 | Recourt Martyn Elizabeth De | Sound absorbing device |
US4211304A (en) * | 1976-02-03 | 1980-07-08 | Recourt Martyn Elizabeth De | Sound absorbing device |
US4090537A (en) * | 1977-02-16 | 1978-05-23 | Bollman Clifford J | Unitary, composite, multi-layer work area |
US4277527A (en) * | 1977-10-03 | 1981-07-07 | Polylok Corporation | Wall construction material comprising a rigid support with a textile material facing laminated thereto |
US4222803A (en) * | 1978-06-05 | 1980-09-16 | Armstrong Cork Company | Method of making fabric covered ceiling board |
FR2465590A1 (en) * | 1979-09-21 | 1981-03-27 | Armstrong World Ind Inc | FABRIC COATED WALL PANEL |
EP0040657A1 (en) * | 1980-05-27 | 1981-12-02 | Carl Matthews | Acoustic energy absorbing device and method, and exhaust systems and air-conditioning or heating ducts containing said device |
US4711685A (en) * | 1982-07-06 | 1987-12-08 | Usg Acoustical Products Company | Soft textured reveal edge ceiling board and process for its manufacture |
US4574915A (en) * | 1983-12-21 | 1986-03-11 | Dr. Alois Stankiewicz Gmbh | Sound barriers |
US4825974A (en) * | 1986-07-18 | 1989-05-02 | Dr. Alois Stankiewicz Gmbh | Adhesive insulation system |
US5153048A (en) * | 1990-03-02 | 1992-10-06 | Armstrong World Industries, Inc. | Fabric covered corrugated board |
US5198278A (en) * | 1990-07-10 | 1993-03-30 | Duskin Co., Ltd. | Service mat with differential bonding between backing and base cloth |
KR100395309B1 (en) * | 2000-10-18 | 2003-08-21 | 조춘남 | Cork carpet by the method and cork carpet manufacture method |
US20070292655A1 (en) * | 2006-06-19 | 2007-12-20 | Lear Corporation | Tuft coating |
US8968502B1 (en) * | 2009-11-06 | 2015-03-03 | John H. Bearden | Method for coating a tufted athletic turf backing |
Also Published As
Publication number | Publication date |
---|---|
DE2356081B2 (en) | 1977-11-24 |
DE2553391A1 (en) | 1976-08-12 |
DE2356081A1 (en) | 1974-05-16 |
CA991375A (en) | 1976-06-22 |
DE2356081C3 (en) | 1978-07-06 |
GB1453445A (en) | 1976-10-20 |
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