US20220105656A1 - Method of manufacturing osb with acoustic dampening properties - Google Patents

Method of manufacturing osb with acoustic dampening properties Download PDF

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Publication number
US20220105656A1
US20220105656A1 US17/517,130 US202117517130A US2022105656A1 US 20220105656 A1 US20220105656 A1 US 20220105656A1 US 202117517130 A US202117517130 A US 202117517130A US 2022105656 A1 US2022105656 A1 US 2022105656A1
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United States
Prior art keywords
layer
lignocellulosic material
noise
core layer
dampening
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US17/517,130
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Ashwin Himatsingani
Jianwen Ni
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Louisiana Pacific Corp
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Louisiana Pacific Corp
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Priority to US17/517,130 priority Critical patent/US20220105656A1/en
Publication of US20220105656A1 publication Critical patent/US20220105656A1/en
Priority to US18/583,723 priority patent/US20240190038A1/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B27N3/143—Orienting the particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/13—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board all layers being exclusively wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • 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
    • 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
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/08—Coating on the layer surface on wood layer
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/24—Organic non-macromolecular coating
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/026—Wood layer
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    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
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    • B32B2262/06—Vegetal fibres
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    • B32B2262/067—Wood fibres
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
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    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
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    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8461—Solid slabs or blocks layered

Definitions

  • This invention relates to a method and system for manufacturing wood products (such as OSB, oriented strand board) with acoustic dampening properties.
  • Airborne noise/STC Sound Transmission Class
  • impact noise Impact Insulation Class, IIC rating in wall and floor or ceiling assemblies often is specified in codes and standards by ANSI, IgCC and LEED.
  • Airborne noise from outside or inside the living space has been addressed with various field-applied and pre-fabricated noise dampening constructions products, such as resilient channels, clips, staggered studs, multiple layers of drywall, wall cavity insulation, and laminated acoustic drywall.
  • Acoustic materials have been used to laminate two panels of various building materials through a secondary process to improve acoustic performance.
  • building materials such as OSB-based siding, sheathing, roofing or flooring, that incorporate a sound dampening material in the primary manufacturing process of panels with improved acoustic performance.
  • the present invention comprises a method or process for manufacturing wood products with acoustic dampening properties.
  • the manufactured wood product include, but are not limited to, oriented strand board (OSB), LSL, MDF, particleboard, or various wood composites.
  • the system introduces a noise-dampening polymer in-line in the manufacturing process to achieve higher acoustic performance (e.g., STC and IIC rating) in siding, sheathing, roofing, flooring, and similar applications using the manufactured wood product.
  • the polymer can be a viscoelastic polymer which is added during blending or formation of the wood product. In one exemplary embodiment, as described in greater detail below, viscoelastic polymer is added to the center strand layer during the OSB manufacturing process.
  • General elements of the OSB manufacturing process include the drying and storing of wood strands, the treatment or blending of designated strands (e.g., bottom, core, top) with applicable chemicals or additives (e.g., wax, resin binders, and the like) the forming of the appropriate layers in order (first bottom surface, then core, then top surface) using designated strands, the application of heat and pressure to the mats to form boards, and subsequent processing (e.g., panels cut to size, edges sealed, and packaging) to produce the finished product.
  • designated strands e.g., bottom, core, top
  • applicable chemicals or additives e.g., wax, resin binders, and the like
  • subsequent processing e.g., panels cut to size, edges sealed, and packaging
  • the core strands are coated with the noise-dampening polymer in a strand blender or blender.
  • the polymer can be blended with the core strands separately, or along with other additives typically added during the OSB process, such as waxes or resin binders. These treated core strands are used to form the central layer, sandwiched between the bottom surface and top surface.
  • the finished product is an OSB panel with a central layer with core strands blended with the noise-dampening acoustic material or materials. This coating by blending can also take place for strands in other layers.
  • the noise-dampening acoustic material or materials are applied through a spraying, flow, curtain, or other coating process in the forming line before, during or after the center strand layer is laid on the forming line. This coating can also take place for strands in other layers.
  • the finished product is an OSB or manufactured wood panel with a central layer with core strands (and possibly other layers) integrally coated, permeated or infused with the noise-dampening acoustic material or materials.
  • FIG. 1 shows a view of a system in accordance with an embodiment of the present invention.
  • FIG. 2 shows another system in accordance with another embodiment of the present invention.
  • FIG. 3 shows another system in accordance with another embodiment of the present invention.
  • the present invention comprises a method or process for manufacturing wood products with acoustic dampening properties.
  • the manufactured wood product include, but are not limited to, oriented strand board (OSB), LSL, MDF, particleboard, or various wood composites.
  • the present invention comprises a system for introducing a noise-dampening polymer in-line in the manufacturing process to achieve higher acoustic performance (e.g., STC and/or IIC rating) in siding, sheathing, roofing, flooring, and similar applications using the manufactured wood product.
  • the polymer can be a viscoelastic polymer which is added during blending or formation of the wood product. In one exemplary embodiment, as described in greater detail below, viscoelastic polymer is added to the center strand layer during the OSB manufacturing process.
  • General elements of the OSB manufacturing process in accordance with the present invention include the drying and storing of wood strands 10 , the treatment or blending of designated strands (e.g., bottom, core, top) with applicable chemicals and/or additives (e.g., wax, resin, and the like) 30 , the forming of the appropriate layers in order (first bottom surface, then core, then top surface) using designated strands, 30 , 40 , 50 , the application of heat and pressure to the mats using a primary press to form boards 60 , and subsequent trimming 70 and processing (e.g., panels cut to size, edges primed/sealed, and packaging) 80 to produce the finished product 100 .
  • designated strands e.g., bottom, core, top
  • applicable chemicals and/or additives e.g., wax, resin, and the like
  • Strands for a particular layer typically are blended with applicable chemicals and/or additives in a bin, separate from strands for other layers, although this is not always the case.
  • Examples of primary processes are described in U.S. Pat. Nos. 6,461,743; 5,718,786; 5,525,394; 5,470,631; and 5,425,976; all of which are incorporated herein in their entireties by specific reference for all purposes.
  • FIG. 2 shows an embodiment of the manufacturing process where the core strands are coated with the noise-dampening polymer in a strand blender or blenders 120 .
  • the top and bottom surface strands are blended separately 20 a , although in some embodiments, one or both sets of strands also may be blended with a noise-dampening polymer.
  • the polymer can be blended with the core strands separately, or along with other additives typically added during the OSB process, such as waxes or resin binders.
  • the treated core strands are used to form the central core layer 140 , sandwiched between the bottom surface and top surface.
  • the finished product is an OSB panel (or other manufactured wood product) with a core layer with core strands blended with the noise-dampening acoustic material or materials.
  • the heat and pressure applied during the primary pressing process promotes the noise-dampening acoustic material to integrally coat, permeate or infuse the core layer, and in several embodiments, portions of the bottom and/or top surface layers.
  • FIG. 3 shows another second embodiment of the manufacturing process where, after blending of the strands 20 a, b , the noise-dampening acoustic material or materials are applied through a spraying, flow, curtain or other coating process 240 in the forming line before, during, or after the center core strand layer is laid on the forming line.
  • the finished product is an OSB panel (or other manufactured wood product) with a central layer with core strands coated with the noise-dampening acoustic material or materials.
  • the heat and pressure applied during the primary pressing process promotes the noise-dampening acoustic material to integrally coat, permeate or infuse the core layer, and in several embodiments, portions of the bottom and/or top surface layers.
  • Binders include, but are not limited to, isocyanate resin, urea-formaldehyde, phenol formaldehyde, melamine formaldehyde, bio-adhesives, or combinations thereof.
  • polymeric isocyanate resin (pMDI, or polymeric diphenylmethane diisocyanate) is used at about 1.2 to about 20 weight %.
  • Waxes include, but are not limited to, a molten wax or emulsion was (in one embodiment, up to about 2.5 weight %).
  • Other chemicals or additives may be used, including, for example, fire retardants, weather-resistant chemicals, or the like.
  • Viscoelastic polymer is added as described above to the center layer or any other layer in the mat. Press time is from 1 to 20 minutes at a temperature from about 100° C. to about 240° C.
  • the resulting panel can range in thickness from about 3 ⁇ 4′′ to about 7′′, and in density from about 25 pcf to about 60 pcf (pounds per cubic foot).
  • the thickness and/or density of the top or bottom strand layer, or both can be modified as well to achieve an improved acoustic performance/STC rating.
  • the present invention thus provides an OSB or manufactured wood panel with a noise-dampening polymer introduced in-line, with a resulting increase (1) in acoustic performance as compared to a standard OSB panel, and (2) in efficiency and reduction in cost compared to secondary manufacturing processes.
  • the noise-dampening polymer becomes integrated with, and infuses or permeates the layer or layers of the panel.
  • the noise-dampening of the present invention applies to both airborne sound transmission loss and impact sound insulation.
  • panels produced in accordance with the present invention smooth airborne sound transmission loss curves in the ASTM E90 test method, particularly increasing loss (dB) in frequency ranges where sound is transmitted more effectively due to physical characteristics (i.e., of a similar panel but without the sound-dampening agent).
  • the present invention increases airborne transmission loss in the sound frequency ranges of from about 1.5K to about 4K Hz (more particularly, from about 2K to about 3.2K Hz, or even more particularly, from about 2.5K to about 3.15K Hz).
  • panels produced in accordance with the present invention demonstrate increased impact sound insulation and decreased sound pressure levels.
  • such panels have a tested apparent impact insulation class (AIIC) rating in the range from about 26 to about 34, as determined by ASTM Standard E-1007 (2016).
  • AIIC apparent impact insulation class
  • a control panel without noise-dampening polymer had an AIIC rating of 19.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Architecture (AREA)
  • Organic Chemistry (AREA)
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Abstract

A manufacturing process for manufacturing wood products with acoustic dampening properties. A noise-dampening polymer is introduced in-line in the manufacturing process to achieve higher acoustic performance. The polymer can be a viscoelastic polymer which is added during blending of the lignocellulosic strands prior to mat formation, or sprayed or otherwise coated on the lignocellulosic strands during mat formation, prior to formation of any boards or panels.

Description

  • This application is a continuation of U.S. patent application Ser. No. 15/832,327, filed Dec. 5, 2017, which claims benefit of and priority to U.S. Provisional Application No. 62/429,896, filed Dec. 5, 2016, and is entitled to those filing dates for priority. The specifications, figures, and complete disclosures of U.S. Provisional Application No. 62/429,896 and U.S. patent application Ser. No. 15/832,327 are incorporated herein in their entireties by specific reference for all purposes.
    • FIELD OF INVENTION
  • This invention relates to a method and system for manufacturing wood products (such as OSB, oriented strand board) with acoustic dampening properties.
    • BACKGROUND OF THE INVENTION
  • Acoustic comfort is important in building design. Noise is the often the primary complaint by home-owners in residential single-family homes, and noise reduction also is an important performance criterion in multi-family and commercial construction (particularly in the healthcare and education segments). Airborne noise/STC (Sound Transmission Class) rating and impact noise (Impact Insulation Class, IIC) rating in wall and floor or ceiling assemblies often is specified in codes and standards by ANSI, IgCC and LEED.
  • Airborne noise from outside or inside the living space has been addressed with various field-applied and pre-fabricated noise dampening constructions products, such as resilient channels, clips, staggered studs, multiple layers of drywall, wall cavity insulation, and laminated acoustic drywall. Acoustic materials have been used to laminate two panels of various building materials through a secondary process to improve acoustic performance. However, there are no building materials, such as OSB-based siding, sheathing, roofing or flooring, that incorporate a sound dampening material in the primary manufacturing process of panels with improved acoustic performance.
    • SUMMARY OF THE INVENTION
  • In various exemplary embodiments, the present invention comprises a method or process for manufacturing wood products with acoustic dampening properties. The manufactured wood product include, but are not limited to, oriented strand board (OSB), LSL, MDF, particleboard, or various wood composites. The system introduces a noise-dampening polymer in-line in the manufacturing process to achieve higher acoustic performance (e.g., STC and IIC rating) in siding, sheathing, roofing, flooring, and similar applications using the manufactured wood product. The polymer can be a viscoelastic polymer which is added during blending or formation of the wood product. In one exemplary embodiment, as described in greater detail below, viscoelastic polymer is added to the center strand layer during the OSB manufacturing process.
  • General elements of the OSB manufacturing process include the drying and storing of wood strands, the treatment or blending of designated strands (e.g., bottom, core, top) with applicable chemicals or additives (e.g., wax, resin binders, and the like) the forming of the appropriate layers in order (first bottom surface, then core, then top surface) using designated strands, the application of heat and pressure to the mats to form boards, and subsequent processing (e.g., panels cut to size, edges sealed, and packaging) to produce the finished product.
  • In a first embodiment of the manufacturing process, the core strands are coated with the noise-dampening polymer in a strand blender or blender. The polymer can be blended with the core strands separately, or along with other additives typically added during the OSB process, such as waxes or resin binders. These treated core strands are used to form the central layer, sandwiched between the bottom surface and top surface. The finished product is an OSB panel with a central layer with core strands blended with the noise-dampening acoustic material or materials. This coating by blending can also take place for strands in other layers.
  • In another exemplary embodiment, the noise-dampening acoustic material or materials are applied through a spraying, flow, curtain, or other coating process in the forming line before, during or after the center strand layer is laid on the forming line. This coating can also take place for strands in other layers.
  • The finished product is an OSB or manufactured wood panel with a central layer with core strands (and possibly other layers) integrally coated, permeated or infused with the noise-dampening acoustic material or materials.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 shows a view of a system in accordance with an embodiment of the present invention.
  • FIG. 2 shows another system in accordance with another embodiment of the present invention.
  • FIG. 3 shows another system in accordance with another embodiment of the present invention.
    •  DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
  • In various exemplary embodiments, the present invention comprises a method or process for manufacturing wood products with acoustic dampening properties. The manufactured wood product include, but are not limited to, oriented strand board (OSB), LSL, MDF, particleboard, or various wood composites.
  • In several embodiments, the present invention comprises a system for introducing a noise-dampening polymer in-line in the manufacturing process to achieve higher acoustic performance (e.g., STC and/or IIC rating) in siding, sheathing, roofing, flooring, and similar applications using the manufactured wood product. The polymer can be a viscoelastic polymer which is added during blending or formation of the wood product. In one exemplary embodiment, as described in greater detail below, viscoelastic polymer is added to the center strand layer during the OSB manufacturing process.
  • General elements of the OSB manufacturing process in accordance with the present invention, as seen in FIGS. 1 and 2, include the drying and storing of wood strands 10, the treatment or blending of designated strands (e.g., bottom, core, top) with applicable chemicals and/or additives (e.g., wax, resin, and the like) 30, the forming of the appropriate layers in order (first bottom surface, then core, then top surface) using designated strands, 30, 40, 50, the application of heat and pressure to the mats using a primary press to form boards 60, and subsequent trimming 70 and processing (e.g., panels cut to size, edges primed/sealed, and packaging) 80 to produce the finished product 100. Strands for a particular layer typically are blended with applicable chemicals and/or additives in a bin, separate from strands for other layers, although this is not always the case. Examples of primary processes are described in U.S. Pat. Nos. 6,461,743; 5,718,786; 5,525,394; 5,470,631; and 5,425,976; all of which are incorporated herein in their entireties by specific reference for all purposes.
  • FIG. 2 shows an embodiment of the manufacturing process where the core strands are coated with the noise-dampening polymer in a strand blender or blenders 120. The top and bottom surface strands are blended separately 20 a, although in some embodiments, one or both sets of strands also may be blended with a noise-dampening polymer. The polymer can be blended with the core strands separately, or along with other additives typically added during the OSB process, such as waxes or resin binders. The treated core strands are used to form the central core layer 140, sandwiched between the bottom surface and top surface. The finished product is an OSB panel (or other manufactured wood product) with a core layer with core strands blended with the noise-dampening acoustic material or materials. The heat and pressure applied during the primary pressing process promotes the noise-dampening acoustic material to integrally coat, permeate or infuse the core layer, and in several embodiments, portions of the bottom and/or top surface layers.
  • FIG. 3 shows another second embodiment of the manufacturing process where, after blending of the strands 20 a, b, the noise-dampening acoustic material or materials are applied through a spraying, flow, curtain or other coating process 240 in the forming line before, during, or after the center core strand layer is laid on the forming line. The finished product is an OSB panel (or other manufactured wood product) with a central layer with core strands coated with the noise-dampening acoustic material or materials. As described above, the heat and pressure applied during the primary pressing process promotes the noise-dampening acoustic material to integrally coat, permeate or infuse the core layer, and in several embodiments, portions of the bottom and/or top surface layers.
  • The components and parameters of the above processes can vary. In one exemplary embodiment, the wood strands can be derived from hard (e.g., aspen) or soft (e.g., southern yellow pine) woods, and can be homogenous (i.e., single wood type) or mixed, and green (moisture content from about 30% to about 200%) or dried (e.g., moisture content up to about 12%) (where moisture content %=(weight of water in wood/oven-dry weight of wood)×100). Binders include, but are not limited to, isocyanate resin, urea-formaldehyde, phenol formaldehyde, melamine formaldehyde, bio-adhesives, or combinations thereof. In one embodiment, polymeric isocyanate resin (pMDI, or polymeric diphenylmethane diisocyanate) is used at about 1.2 to about 20 weight %. Waxes include, but are not limited to, a molten wax or emulsion was (in one embodiment, up to about 2.5 weight %). Other chemicals or additives may be used, including, for example, fire retardants, weather-resistant chemicals, or the like. Viscoelastic polymer is added as described above to the center layer or any other layer in the mat. Press time is from 1 to 20 minutes at a temperature from about 100° C. to about 240° C. The resulting panel can range in thickness from about ¾″ to about 7″, and in density from about 25 pcf to about 60 pcf (pounds per cubic foot).
  • In any of the above embodiments, the thickness and/or density of the top or bottom strand layer, or both, can be modified as well to achieve an improved acoustic performance/STC rating. The present invention thus provides an OSB or manufactured wood panel with a noise-dampening polymer introduced in-line, with a resulting increase (1) in acoustic performance as compared to a standard OSB panel, and (2) in efficiency and reduction in cost compared to secondary manufacturing processes. The noise-dampening polymer becomes integrated with, and infuses or permeates the layer or layers of the panel.
  • In several embodiments, the noise-dampening of the present invention applies to both airborne sound transmission loss and impact sound insulation. In some embodiments, panels produced in accordance with the present invention smooth airborne sound transmission loss curves in the ASTM E90 test method, particularly increasing loss (dB) in frequency ranges where sound is transmitted more effectively due to physical characteristics (i.e., of a similar panel but without the sound-dampening agent). In one embodiment, the present invention increases airborne transmission loss in the sound frequency ranges of from about 1.5K to about 4K Hz (more particularly, from about 2K to about 3.2K Hz, or even more particularly, from about 2.5K to about 3.15K Hz).
  • In additional embodiments, panels produced in accordance with the present invention demonstrate increased impact sound insulation and decreased sound pressure levels. In one embodiment, such panels have a tested apparent impact insulation class (AIIC) rating in the range from about 26 to about 34, as determined by ASTM Standard E-1007 (2016). In contrast, a control panel without noise-dampening polymer had an AIIC rating of 19.
  • Thus, it should be understood that the embodiments and examples described herein have been chosen and described in order to best illustrate the principles of the invention and its practical applications to thereby enable one of ordinary skill in the art to best utilize the invention in various embodiments and with various modifications as are suited for particular uses contemplated. Even though specific embodiments of this invention have been described, they are not to be taken as exhaustive. There are several variations that will be apparent to those skilled in the art.

Claims (13)

What is claimed is:
1. A method for producing a noise-dampening manufactured wood product, comprising the steps of:
treating a set of core layer lignocellulosic material with one or more chemicals or additives;
treating, in a manufacturing production line, the set of core layer lignocellulosic material with a noise-reducing polymer, wherein the noise-reducing polymer does not form a homogenous layer;
forming a multi-layer mat of lignocellulosic material, said multi-layer mat comprising a core layer comprising the treated set of core layer lignocellulosic material;
applying heat and pressure to the multilayer mat to produce a noise-dampening manufactured wood product.
2. The method of claim 1, wherein the noise-dampening manufactured wood product comprises one or more boards or panels.
3. The method of claim 1, wherein the noise-dampening manufactured wood product comprises a oriented strand board panel.
4. The method of claim 1, wherein the multi-layer mat comprises three layers.
5. The method of claim 4, wherein the three layers are a top layer, a bottom layer, and the core layer therebetween.
6. The method of claim 5, further comprising the steps of:
treating a set of top layer lignocellulosic material with one or more chemicals or additives; and
treating a set of bottom layer lignocellulosic material with one or more chemicals or additives.
7. The method of claim 6, wherein the step of forming a multi-layer mat of lignocellulosic material comprises the steps of:
forming, in the production line, the bottom layer from the set of bottom layer lignocellulosic material;
forming, in the production line on the bottom layer, the core layer from the set of core layer lignocellulosic material; and
forming, in the production line on the core layer, the top layer from the set of top layer lignocellulosic material.
8. The method of claim 1, wherein the step of treating the set of core layer lignocellulosic material with the noise-reducing polymer comprises blending the polymer with the core lignocellulosic material prior to formation of the core layer.
9. The method of claim 1, wherein the step of treating the set of core layer lignocellulosic material with the noise-reducing polymer comprises spraying, flowing, curtain coating or otherwise coating the core layer with the polymer.
10. The method of claim 7, further comprising the step of treating the set of bottom layer lignocellulosic material with the noise-reducing polymer.
11. The method of claim 7, further comprising the step of treating the set of top layer lignocellulosic material with the noise-reducing polymer.
12. The method of claim 1, wherein the noise-reducing polymer is integrated with the lignocellulosic material forming the core layer.
13. The method of claim 1, wherein the lignocellulosic material comprises strands.
US17/517,130 2016-12-05 2021-11-02 Method of manufacturing osb with acoustic dampening properties Pending US20220105656A1 (en)

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