Abstract: A sound-damping mat or drape comprises a flexible layer (5) having distributed therein particles (5) of a higher specific gravity than the material of the flexible layer. The flexible layer comprises a material having open pores and the pores are filled over at least a part of the thickness of the layer with said particles. The particles are bound to each other and to the defining walls of the pores. The mat or drape is preferably manufactured by vibrating the heavy particles down into the pores of the porous flexible layer, whereafter a binder is sprayed over the surface of the layer.

Abstract: The invention relates to a sound damping material in the shape of foils or strips comprising open-pored foam material impregnated with different quantities of a viscoelastic compound, which is intended for application to attenuated structures, particularly automobile body panels.

Abstract: The invention provides a novel aluminum hydroxide-based spray-on insulating material which is workable by blowing to form a layer on the ceiling or wall of a building effective for heat and sound insulation. The inventive material is prepared by first blending an organic fibrous material, e.g. reclaimed pulp from scrapped papers, with a gel-like amorphous aluminum hydroxide sludge, available in large quantities as a waste in the anodization treatment of aluminum articles, with adjustment of the pH of the mixture to weakly acidic whereby the organic fibers are entrammeled by the coagulated aluminum hydroxide and then a powdery aluminum hydroxide, which is prepared by drying and pulverizing the gel-like aluminum hydroxide sludge, is admixed with the mixture followed by drying and disintegrating the blend into fluffs. The spray-on insulating material is worked by blowing as such or may be blown together with an adhesive so as to increase the mechanical stability of the insulating layer.

Abstract: The present invention relates to a sintered porous metal plate which comprises metal particles directly and integrally bonded together by sintering under pressure, said plate being of a porous structure and having a density gradient in the direction of thickness. The present invention is also directed to a method of making such a sintered porous plate.

Abstract: A novel method of producing a vibration damping and sound absorbing coating on a rigid substrate is provided in which method a first coating of a viscoelastic material having after gelling a modulus of elasticity of 5.times.10.sup.6 to 5.times.10.sup.8 dynes/cm.sup.2 is sprayed onto the substrate whereafter there is sprayed onto said first coating a second coating of a viscoelastic material having after gelling a modulus of elasticity of 5.times.10.sup.7 to 5.times.10.sup.9 dynes/cm.sup.2, the modulus of elasticity of said second outer coating being at least 10 times greater than that of said first coating.

Abstract: Disclosed herein is a flexible acoustical laminate construction which can be applied to noisy enclosures in order to attenuate noise therein. The construction of the invention finds particular use as a cabliner for the cabs or crew compartments of heavy construction, industrial, mining and transportation equipment of various types.

Abstract: A multilayered sound absorbing panel formed from aramid cloth and aramid felt layers. An intervening film between the cloth and felt layers may be included, bonded to those layers in interrupted patterns so as to leave portions of the film non-bonded to the cloth and felt layers.

Abstract: The invention is a new acoustic panel and sound barrier constructed therefrom in which the panel is composed of a layer of fine aggregate concrete and a layer of chemically mineralized and neutralized fibres blended with portland cement. The panel may have a tongue and groove to form airtight joints. The barrier is effective, fire proof, weather resistant, corrosion resistant and not adversely affected by chemical herbicides.

Abstract: Formed structures comprising synthetic thermoplastic fibrils or fibrids having a surface area (specific surface) higher than 1 m.sup.2 /g and useful for soundproofing purposes are provided. Methods for making the structures are also disclosed.

Abstract: A moldable sound control composite is disclosed combining in itself when molded damping, barrier performance, and structural strength for use within a predetermined environment temperature range. As such, the moldable composite is not applied to other structures to damp their sound generation, but forms by itself a complete structural member having not only desirable sound reducing properties but desirable strength properties as well. The composite comprises a blend of a primary non-viscoelastic organic polymeric resinous material intended to impart structural strength to the composite, a secondary viscoelastic organic polymeric resinous material to provide damping performance, and filler material adapted to densify the composite and impart barrier performance. Optionally, at least one of the primary and secondary resinous materials may be thermosetting.

Abstract: A multilayer sheeting for attachment to sheet metal to stiffen the sheet metal and diminish noise. An anti-drumming sheeting consisting of a filler embedded in a mass such as a bituminous material may be bonded to sheet metal, such as the sheet metal employed in manufacture of an automobile door, and a stiffening sheeting which may consist of a matrix such as a fiberglass mat drenched in a thermosetting resin is bonded to the anti-drumming sheeting. Such a multilayer anti-drumming and stiffening sheeting is flexible enough during application to conform to the configuration of the sheet metal, but hardens into a rigid lining component when the sheet metal is heat treated during the normal course of fabrication.

Abstract: A sound barrier material for a road or a trainway comprised of a barium sulfate loaded chlorinated polyethylene laminated to each side of a foraminous metal member with a coating of about 0.05 to 8.13 centimeters in gauge.

Abstract: Method of making attenuation sandwich panels having a cellular core positioned between and bonded to an imperforate facing sheet on one surface thereof and a perforate sheet with an outer layer of porous fabric material adhered to the other surface. The combined perforate facing sheet and porous fibrous material have a predetermined open surface area prior to its adherence to the cellular core. A coating of adhesive is applied to either the facing sheets or to the faying surface of the cellular core. The sheets are then properly positioned with respect to the cellular core. The porous fabric surface of the combined perforate sheet and porous fibrous material is positioned against a perforated plate. The opposite surface of the perforated plate is positioned against a bonding tool that has a plurality of longitudinal grooves on its perforated plate adjacent surface.

Abstract: The invention relates to a paste-like, viscous damping medium dispersion based on a liquid phase and graphite, where at least one agent for increasing the intrinsic viscosity and at least one wetting agent for wetting the graphite are added to the dispersion. The dispersion according to the invention is free-flowing over a very large temperature range, does not increase in hardness when under load but remains viscous, and is noise-insulating. The dispersion according to the invention does not swell elastomers.

Abstract: Chrome tanned leather scrap is converted into thermal insulation by shredding the tanned leather scrap into leather fibers, without damaging the structural fiber integrity, and case hardening the shredded leather fibers. The shredded leather fibers are case hardened by reducing the moisture content thereof to less than 5% by weight, and preferably less than 2%.

Abstract: This invention pertains to asphaltic sheet sound deadener for use as a vibration damping medium, which can be bonded in place without excessive sag or flow by subjecting the material to 250.degree.-400.degree. F. The main use of this material is in the automotive field, but may be used in other areas such as the appliance and furniture industries. The melt flow properties of the deadener are controlled by the use of ground mica.

Abstract: A laminate structure for acoustical applications which comprises a porous, flexible, non-woven, needle punched mat of inherently non-burning, fine glass or other material fibers affixed as a facing to a sound absorbing, flame retardant, flexible backing such as a layer of open cell foam or a mat of glass or mineral fibers. The invention also contemplates the method of manufacture of such a laminate structure. Depending upon the materials used therefor, the facing and the backing may be joined together by needle punching and subsequent chemical bonding, chemical bonding, flame bonding and, in the case of an open cell foam backing, the backing may be foamed in place on the facing forming an intimate bond therewith.

Abstract: A porous sintered material of good permeability and effective sound absorbability, being formed by combining between particles of aluminum or aluminum alloy powder into a body by means of sintering and having connecting pores among the particles of said aluminum or aluminum alloy powder. Said porous sintered material is obtained by mixing aluminum or an aluminum alloy with a low melting point aluminum alloy, forming the mixture into the predetermined shape and sintering it at a temperature which is at least 10.degree. C. lower than the melting point of the base material and higher than that of the low melting point material.

Abstract: An article especially suited for use as a vibration isolating or shock absorbing structure comprising a multitude of short, resiliently compressible, elastic, tubular, rubbery bodies held together in closely-packed relationship by restraining means. The rubbery bodies comprise a cured thermosetting millable extrudable composition having in the cured state an elasticity in excess of 200% and an elongation at break in excess of 300%. The tubular bodies are characterized by having a length to diameter ratio from about 2:1 to about 8:1 and a wall thickness of at least 0.025 inch.

Abstract: Crushed foam coated urethane foam is disclosed wherein the crushed foam coating contains a pigment or a flame retardant or both to protect the urethane foam against discoloration due to ultraviolet light or to provide protection against fires. The crushed foam may be obtained from a frothed latex applied to the polyurethane foam, dried and crushed to a final thickness of 10 mils to 250 mils.

Abstract: A damping agent for damping mechanical and/or acoustical vibrations. The agent includes a fluid phase of a polyglycol, silicone oil, mineral oil, and/or a saturated aliphatic or aromatic carboxylic acid ester having graphite dispersed therein. The graphite is dispersed by means of a wetting agent. Anti-oxidants and an agent to stabilize the structural viscosity of the damping agent may also be included.

Abstract: An improved sound absorptive tackable space dividing wall panel or similar article in which a wire mesh screen is disposed within the sound absorptive material a distance from the tackable surface less than the length of the tack pin, thereby providing additional support for the tackable load without appreciably reducing the sound absorptive characteristics of the panel.

Abstract: A method for producing an acoustical ceiling tile or panel faced with a distortion free decorative thin plastic film is accomplished by first embossing the acoustical base to form a picture frame surrounding a recessed area, stretching the thin decorative plastic film over the picture frame portion and adhesively securing the film to the side and/or back of the acoustical base and subsequenytly heat shrinking the film to produce a distortion free decorative surface.

Abstract: A noise barrier pad and a method for the production of same comprises the steps of forming a tread layer by reacting a mixture for polyurethane foam in a hollow mold having separable upper and lower parts and which is shaped so as to form the tread layer, curing the foam, removing the upper part of the mold, placing a blank of noise barrier material on the surface of the foam which corresponds to the bottom side of the tread layer, and forming a bottom foam layer on the tread layer and barrier material by placing another upper mold constructed in accordance with the bottom layer of the noise barrier pad and defining a cavity over the tread layer and barrier material and filling the cavity with the reaction mixture for the polyurethane foam.

Abstract: A fibrous shaped article having a surface with raised and depressed portions, said fibrous article consisting of a unitary laminated structure resulting from the compression molding under heat of (A) a heat compression-moldable nonwoven fibrous web and (B) a nonwoven fibrous sheet, said fibrous sheet (B) being laminated to at least one surface of said fibrous web (A); said fibrous web (A) having a compression stress, at 10% compression at the temperature of said compression molding, of at least 0.5 g/cm.sup.

Abstract: A laminated noise attenuation panel for both sound absorption and sound transmission loss having as its principal layers an expanded thermoplastic core with alternately inverted cavities, half opening to each side of said core and a sheet of cured resinous material having hollow microspheres with substantially reduced atmospheric pressure randomly dispersed in said resinous material, said cured resinous sheet facing away from the noise source. The cavities of said core panel facing away from said noise source may be filled with cellulose. The side of said core panel toward the noise source may include a laminated layer of a perforated material and a decorative layer. The side of said panel away from the noise source may also include a layer of other materials and a decorative layer. Data for the noise attenuation properties of various combinations of laminations are presented.

Abstract: Sound proof materials for buildings are disclosed. This material is prepared by mixing powdery lead with an impregnating resin, a solvent, a plasticizer and the like and then applying them on at least one side of a glass cloth.

Abstract: A moldable sound control composite is disclosed combining in itself when molded damping, barrier performance, and structural strength for use within a predetermined environment temperature range. As such, the moldable composite is not applied to other structures to damp their sound generation, but forms by itself a complete structural member having not only desirable sound reducing properties but desirable strength properties as well. The composite comprises a blend of a primary non-viscoelastic organic polymeric resinuous material intended to impart structural strength to the composite, a secondary viscoelastic organic polymeric resinuous material to provide damping performance, and filler material adapted to densify the composite and impart barrier performance. Optionally, at least one of the primary and secondary resinuous materials may be thermosetting.

Abstract: A multi-layer acoustic lining is of the type having core compartments rendered effective as Helmholtz resonators by means of resonator necks projecting from the core facing layer into the core compartments. In order to broaden the frequency response, those ends of the resonator necks which project into the core compartments are bevelled so as to give the necks a less well defined length. The acoustic lining is particularly for application to the jet pipe or fan duct of a turbofan aeroengine.

Abstract: A flexible acoustical wall covering, method of making same, and wall panel employing same are provided wherein such wall covering is comprised of a laminated construction comprised of a substrate and an outer layer bonded against the substrate with the outer layer having a roughened outside surface defined by projections and indentations which serve as miniature sound baffles and a plurality of spaced openings in and disposed perpendicularly through the laminated construction which allow sound waves to pass therethrough with a fluid impervious film sealing the openings and enabling the wall covering to be used as a fluid impervious covering yet with the film allowing substantially unobstructed passage of the sound waves therethrough.

Abstract: Thermoplastic compositions of matter comprising coal-tar pitch and a material selected from (1) a terpolymer of ethylene, vinyl acetate, and an ethylenically-unsaturated carboxylic acid and (2) a mixture of copolymers of ethylene and vinyl acetate and of ethylene and an ethylenically-unsaturated carboxylic acid, exhibiting high strength in shear and peel over a wide temperature range, are prepared and used as adhesives and coatings. Laminated materials utilizing such compositions of matter are also disclosed.

Abstract: Sound insulating units and sound barriers made therefrom include at least one flexible sheet having a surface density of at least 2.0 Kg/cm.sup.2. Such sheets are capable of being connected to form an efficient sound barrier.

Abstract: A foam seal and insulator for sealing a compartment in the control console and attenuating sound in the compartment which contains a plurality of actuating levers for controlling the operation of the vehicle with actuating cables extending through the insulator to control the operation of the vehicle.

Abstract: A perlite sound absorbing plate and a sound insulating wall constructed by arranging a number of said plates side by side and by assembling together into one integral body are disclosed. The plate is composed of a mixture including 1,000 cm.sup.3 by bulk volume of formed perlite particles each having a diameter of 0.1 to 7.0 mm, 100 to 140 g of cement, liquid rubber latex containing 5 to 20 g of solid ingredients and a suitable amount of water and produced by press molding with a compression ratio of 1.10 to 1.30. The wall is constructed by assembling a number of said plates each provided with a side groove with the aid of supporting columns and reinforcing plates, each having a ridge adapted to be engaged with the side groove of said plate.

Abstract: The disclosed foam laminate preferably includes a corrugated paper sheet, a layer of thermosetting resin foam wherein the corrugations extend into and are bonded to the foam layer and a relatively flexible finish sheet bonded to the foam layer. The corrugated sheet preferably includes a corrugated paper sheet bonded to a relatively flat sheet. In the disclosed automotive headliner, the corrugations preferably extend perpendicular to the headliner side edges, providing support for the concave midportion of the headliner and preventing delamination of the paper and foam laminae.

Abstract: A fiberglass mat of a particular formulation is used to insulate exhaust system components such as mufflers, converters, and conduits.

Abstract: A sound deadener sheet softenable by heat to wilt into conformity and adhesive engagement with a contoured metal surface but resistant to running and flow at higher temperatures comprising a mineral-filled bitumen containing a small amount of vulcanized vegetable oil.

Abstract: High temperature resisting cordage is wrapped around an exhaust gas muffler housing and covered with an outer wrap of metal to provide sound and thermal insulation for the muffler.

Abstract: A sound barrier material comprised of a polyvinyl chloride impregnated mesh sheet having a coating of about 0.02 to 3.2 inch gauge of a barium sulfate loaded chlorinated polyethylene laminated to a foam of 1.5 to 2.5 pounds per cubic foot.

Abstract: A composite panel is described in which the face sheets and the core have properties such that the panel produces a double wall resonance near the low frequency end of the principal speech bands and in which the panel produces interaction between the symmetric and antisymmetric mode in the principal speech bands, thereby providing greater than mass-law transmission loss over a substantial portion of the audio frequency spectrum. At frequencies above the principal speech bands effects are determined primarily by the properties of the individual face sheets.

Abstract: Acoustical insulation or sound absorbing material particularly useful as automobile muffler material, having high temperature, vibration and chemical resistance, and of sufficient structural rigidity to resist packing or degradation when exposed to engine heat, vibration and exhaust gas pressures, formed of an alumina-silica ceramic fiber matt or blanket impregnated with a colloidal silica binder. The muffler acoustical and thermal insulation can be in the form of a hollow cylindrical body of alumina-silica fibers coated on its inside and outside surfaces and on its ends, with an aqueous colloidal silica sol, and the material dried.

Abstract: An embossed film-to-foam laminate is provided having minute perforations through the film selectively distributed essentially along the sidewalls and valleys of the embossed pattern. The integrity of the laminated film material is retained on the crowns of the embossed patterned surface, since the perforations in the film material are mainly distributed on the sidewalls and valleys of the embossed pattern. The laminated product has a water-resistant and abrasion-resistant upper surface imparted by the film material on the crowns while the small perforations in the sidewalls and valleys permit sound to pass through the film and be exposed to the acoustical matrix of the open cell foam component of the laminate while impeding the penetration of liquids (e.g. water) through the film into the foam under the action of gravity. The film and/or the foam material are heated to supply adhesive material by melting or softening which serves to bond the film material to the foam.

Abstract: An anti-abrasive, flame-resistant, and noise-suppressant laminate suitable for use with underground scraper conveyors or the like comprising two outer layers of ferrous material having an inner layer of styrene butadiene rubber material vulcanized therebetween. The styrene butadiene rubber material has a durometer of the order of 59, a flame spread index of less than 25 according to ASTM-E162 and a thickness of the order of 1/4 inch. One of the outer layers is of abrasive resistant steel and has a thickness of the order of 1/4 inch. The other outer layer is of 1020 steel and has a thickness of 16 gage.

Abstract: The sound attenuation material disclosed in this application comprises, in its basic aspects, an outer layer, a sound absorption layer, and a sound barrier layer disposed between the sound absorption layer and outer layer and bonding them together.Over the years there have been developed a number of compositions, and laminated and coated articles, for use as vibration dampening and sound attenuation means. One such a sound and shock absorbing means is in the form of an adhesive tape and is shown in U.S. Pat. No. 3,217,832. The tape is manufactured by coating a woven webbing of plastic material such as nylon with a viscoelastic, tacky, filled composition comprising, inter alia, polybutene, petroleum oil, and barytes. The density of the composition is increased if vibration dampening is of prime importance and decreased for better sound absorption.In U.S. Pat. No.

Abstract: A textured building material, suited for use as an acoustical wall and ceiling covering, comprising a cellular urethane foam substrate and an elastomeric coating and a method for its production is disclosed. The building material is flexible and damage resistant, which makes it especially useful in mobile vehicles and homes. The process consists of applying a foamed elastomeric resin emulsion onto a urethane substrate to a desired thickness; drying the coated substrate thus formed; and thereafter crushing the dried elastomeric coated substrate to form a composite textured material.