US2077720A - Felted product and method of making the same - Google Patents

Felted product and method of making the same Download PDF

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Publication number
US2077720A
US2077720A US23802A US2380235A US2077720A US 2077720 A US2077720 A US 2077720A US 23802 A US23802 A US 23802A US 2380235 A US2380235 A US 2380235A US 2077720 A US2077720 A US 2077720A
Authority
US
United States
Prior art keywords
fibres
clusters
felt
mineral wool
felted
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
Application number
US23802A
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English (en)
Inventor
William R Seigle
Brown George Basil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johns Manville Corp
Johns Manville
Original Assignee
Johns Manville
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Johns Manville filed Critical Johns Manville
Priority to US23802A priority Critical patent/US2077720A/en
Priority to FR809949D priority patent/FR809949A/fr
Priority to DEJ55112D priority patent/DE685424C/de
Priority to GB14984/36A priority patent/GB475819A/en
Application granted granted Critical
Publication of US2077720A publication Critical patent/US2077720A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B30/00—Compositions for artificial stone, not containing binders
    • C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D21H13/38—Inorganic fibres or flakes siliceous
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/02—Patterned paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/16—Special fibreboard
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D21H13/38—Inorganic fibres or flakes siliceous
    • D21H13/40—Inorganic fibres or flakes siliceous vitreous, e.g. mineral wool, glass fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D21H13/38—Inorganic fibres or flakes siliceous
    • D21H13/42—Asbestos
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • 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.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • 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.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24562—Interlaminar spaces

Definitions

  • This invention relates to a felted fibrous prodnot and the method of making the same.
  • An object of the present invention is the production of thermal insulation of felted, fibrous, nonv combustible material, which insulation is high in efficiency, light in weight, easy to manufacture, low in cost and easily and quickly applied where desired.
  • the sheet which is thus relatively smooth on the under side and irregular on the upper side, is dried to remove the remaining water, but without calendering or otherwise completely crushing down the very highly porous lumps or projections.
  • a plurality of the layers or sheets are superposed to form a built up structure of the desired thickness, preferably but not necessarily, before drying to remove such water as is not removed by the suction.
  • the sheets or layers are brought together the pro- J'ections which have been automatically formed without any embossing or other mechanical action and which are themselves highly porous and are integral with the thinner portions, serve to slightly space the thinner portions to varying degrees. Due to the spacing action and the porosity of the nodules or clusters, an extremely light product is formed, which structure is highly efiicient as a thermal insulator.
  • the product may be made at very low cost.
  • FIG. 1 shows a diagrammatic sectional side view of equipment suitable for use in making the improved product
  • Fig. 2 shows a sectional view on line 2-2 of Fig. 1, with the felt somewhat exaggerated in thickness, as compared to its outer dimensions, for clearness of illustration;
  • Fig. 3 shows a sectional view on line 3-3 of Fig. 1, withthe felt again exaggerated in thickness;
  • Fig. 4 shows an end view of a. section of tubular pipe covering constructed in accordance with the invention
  • Fig. 5 shows a side view of a bat or pad also constructed in accordance with the-invention
  • Fig. 6 shows a modified form of bat in the process of formation
  • Fig. 7 shows a side view of another modification of the invention.
  • a water-permeable conveyer' 9 such as a continuous retiform belt of coarse wire gauze, passing over the guide rollers Ill, II and H of which one, suitably, roller I2 is motor-driven.
  • a feed hopper l3 Placed above the upper reach of the conveyer belt and, suitably, near the roller l I is a feed hopper l3, of width slightly less than the width of the belt.
  • This hopper may be provided with a retaining strip M of rubber composition or other satisfactory sheet material, contacting with the upper surface of the belt 9 andretarding or preventing the flow oi? the mixture from the hopper counter to the direction of movement of the conveyer.
  • This mixture consists of an aqueous suspension of incompletely intermingled fibres of a relatively collapsible nature and fibres or fibrous structure of a less collapsible nature.
  • the suspension may contain well dispersed fibres of mineral wool II and void-containing clusters Ill of mineral wool fibres unevenly distributed throughout the suction will support.
  • the suspension may be formed in a separate tank (not shown) provided with gentle agitation and transferred to the feed hopper I3 by any suitable means.
  • the conveyer belt in its upper reach, may travel upwardly in inclined manner, to minimize excessive flowing of the said suspension forwardly along the conveyer, while making possible a substantial hydrostatic head at the deepest portion of the suspension. This head causes filtration through the belt 9 and the collection thereon of a thick felt.
  • the felt produced is also of varying nature.
  • the felt will include portions containing a large proportion of clusters 18 of mineral wool, enclosed by and interfelted with dispersed fibres, and intervening portions 20 in which there are either no clusters of mineral wool or smaller or fewer clusters than in the first-mentioned portions.
  • Water passing by filtration through the belt may be collected and allowed to flow away through the receiver it that is placed under the said member at a position beneath the hopper l3.
  • the said member I! is connected to a vacuum line; so that there is applied to the felt, quickly, a suction corresponding,'for ex ample, to 6 inches of mercury or more.
  • This suction causes penetration of the clusters by adjacent fibres, to give integral binding. It also causes collapse of the felt, to an extent varying with the nature of the fibres predominating in different portions of the felt.
  • a felt one-half inch thick was found to collapse, under the influence of the suction, to a maximum thickness of one-tenth inch.
  • the thickness may be only one-twentieth of an inch in the depressed portions, between the said elevated portions.
  • the result is a product of highly irregular upper surface having elevations at positions corresponding to the location of clusters of mineral wool.
  • suction above referred to may be substituted by other equivalent means, such as air under moderate pressure applied to the upper surface of the felt, for subjecting the felt to different pressures on its two faces.
  • equivalent means such as air under moderate pressure applied to the upper surface of the felt, for subjecting the felt to different pressures on its two faces.
  • the presence of the dispersed-fibres of mineral wool increases the resistance to the passage of fluid through the felt and, thereby, increases the vacuum, expressed in pounds to the square inch, that the felt under This increased suction and the intermingling of the fibres and clusters of rock wool in non-uniform manner causes the uneven and extensive collapse of the felt.
  • the felt product is to be used in pipe covering
  • the felt may be wrapped, in wet form, around the mandrel l8.
  • the felt is not calendered or smoothed but is wrapped upon itself with the projections left upstanding.
  • the wound material is severed from the oncoming sheet, the mandrel and material .wound therearound is removed, and a new mandrel inserted.
  • the winding operation is then resumed.
  • the wound material is subjected to drying, to remove water and cause stiffening or hardening of the binder and setting of the material in the previously established form.
  • the smooth base portion of one ply of the sheet material contacts with the elevated sequent minimizing of circulation of air therebetween, when the finished article is used as thermal insulation.
  • the several plies of the felt Before being assembled, the several plies of the felt may be coated discontinuously or lightly with a thin layer of adhesive, so that the several plies are adhesively secured in the final assembly.
  • the tubular insulation may be provided with an inner lining and reenforcing material 2 i, such as a sheet of asbestos paper, and an outer wrapper 22 of suitable reenforcing sheet material, such as cloth or paper.
  • an inner liner is to be used, it is suitably placed around be made a bat or pad, such as illustrated in Fig. 5, including composited plies of the sheet material of substantially regular lower surface and uneven upper surface. If no binder has been used in the original felted sheet material or if the several sheets have been dried before being composited, then the several plies may be adhered together by means of a small proportion of binder material applied to the surfaces of the sheets before being composited.
  • the felt from position 23, Fig. 1 may be lapped on itself by a reciprocating lapping mechanism, illustrated generally at 24, Fig. 6, this mechanism replacing, for the purpose, the mandrel l8.
  • clusters 25 of rock wool may be dropped upon the surface of the wet felt as at approximately the position of section line 2-2, Fig. 1. These clusters become entangled (interlocked) with the fibres of the surface portion of the felt j may admix starch or a casein adhesive.
  • a number of plies of felt so made may be composited, as illustrated, the clusters 25 serving as very effective spacing means between the several plies.
  • the mineral wool fibres may be of length that is medium for common mineral wool products. Fibres that are too short give a felt that is not sufiiciently strong, whereas fibres that are too long do not mat down well in the finished felt. A fibre that has been used satisfactorily contains a predominating proportion of fibres of the average length of about one-half centimeter.
  • the asbestos fibres may substantially enclose the fibrous clusters, and minimize air circulation therethrough, whereby the effectiveness as thermal insulation is increased.
  • the nodules of mineral wool used may be those made conventionally by suitable tumbling of mineral wool in dry form.
  • the resulting uneven mixture is then charged into the hopper l3 and fabricated as described.
  • the product made as described has interesting properties. effective in thermal insulation; it has a low coefiicient of heat transfer and all parts thereof are semirefractory. Because of the interlocking of the intermingled fibres of which the material is composed, the product is coherent.
  • the dispersed fibres engage the exterior surfaces of the clusters of mineral wool and extend as felted or matted material between the individual, adjacent clusters or nodules.
  • the fibres serve to reenforce and skeletonize the whole, with preservation of voids within the clusters.
  • the matted fibres in. the composited articles shown in Figs. 4-7 extend predominantly generally transversely with respect to the shortest dimension of the articles.
  • the wire gauze constituting the belt 9 may be about 20-mesh or coarser.
  • a lightweight fibrous product comprising forming 'an aqueous sus pension of the selected fibrous material, forming a wet felt from the said suspension, applying to a surface of the wet felt clusters of fibrous material adapted to be interlocked in the said felt, to give a sheet of irregular surface and thickness, and then drying the said sheet, to set the shape thereof.
  • a sheet comprising resiliently compressible nodules of mineral wool constituting thick portions of the sheet and a thin web of matted fibres extending between the said nodules, therearound, and thereinto, the web being interlocked with the nodules and forming therewith a coherent sheet provided with irregularities of surface and the sheet being in unsmoothed condition.
  • An insulating covering comprising superimposed sheets including spaced, void containing, loosely felted clusters of mineral wool fibres, and a web of less thickness than the clusters and comprising more closely felted mineral wool fibres extending between and interlocked with the fibres of the clusters, the clusters spacing the adjacent sheets apart and coacting with. the sheet faces to form pockets containing air.
  • An article of manufacture comprising a flexible insulating sheet comprising void containing It is light in weight. It is very clusters, whereby circulation of air through the clusters is minimized.
  • a lightweight, felted sheet product which includes the steps of forming an aqueous suspension comprising mineral fibres, a portion of the fibres being in separate dispersed condition and other portions of the fibres being in definite clusters, depositing the fibres on a permeable, travelling supporting surface to form a wet mass of interengaged fibres, applying sufficient suction to remove the major portion of the water from the wet felt through said supporting surface and to mat the dispersed fibres and collapse the clusters only partially, so as to form projections on the face of the sheet, and assembling a plurality of layers of said sheets in superimposed relationship, the said projections serving to space the layers.
  • An article of manufacture comprising superimposed flexible insulating sheets including void containing, loosely felted clusters of mineral wool fibres disposed in a substantially common plane, and a web of less thickness than the clusters and comprising more closely felted fibres of mineral wool and asbestos interconnecting the clusters and interlocked with the cluster fibres and extending predominantly in a direction generally transverse to the direction of the shortest dimension of the sheet.
  • An article of manufacture comprising a flexible insulating sheet comprising void containing,
  • An article of manufacture comprising superimposed flexible insulating sheets including void containing, loosely felted clusters of mineral wool fibres disposed in a substantially common plane and a web of less thickness than the clusters and comprising more closely felted fibres of min eral wool and asbestos interconnecting the clusters and interlocked therewith, a coating of the circulation of air through the web material extending entirely over the clusters, whereby circulation of air through the clusters is minimized, the clusters spacing adjacent sheets apart and cooperating with the web to form pockets containing air.
  • a flexible insulating sheet comprising void containing, loosely felted, fibrous clusters, and a web of less thickness than the clusters and ineluding more closely felted fibres which interlock with the cluster fibres and interconnect the clusters.
  • An insulating covering comprising 5111M rimposed sheets including void containing, ioosgly felted, fibrous clusters, a web of less thickv ness than the clusters and comprising more closely felted fibres interlocked with the cluster fibres; and interconnecting the said clusters, and a binder material which is semi-rigid when dry and which produces adherence between the various fibres as well as between the sheets.
  • An insulating covering comprising a strong flexible sheet including void containing, loosely felted, fibrous clusters, and a web generally of less thickness than the clusters and comprising the same but more closely felted fibres extending between and interlocked with the fibres of the clusters.
  • a flexible insulating sheet comprising void containing, loosely felted clusters of mineral wool fibres disposed in a substantially common plane, and a web of more closely felted fibres of mineral wool and asbestos interlocked with the fibres of the clusters and coating the clusters, whereby clusters is minimized.
  • a flexible insulating sheet comprising void containing, loosely felted clusters of mineral wool fibres disposed in a substantially common plane, and a web of more closely felted fibres of mineral wool and amosite interlocked with the fibres of the clusters and coating the clusters, whereby circulation of 'air through the clusters is minimized.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Thermal Insulation (AREA)
US23802A 1935-05-28 1935-05-28 Felted product and method of making the same Expired - Lifetime US2077720A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US23802A US2077720A (en) 1935-05-28 1935-05-28 Felted product and method of making the same
FR809949D FR809949A (fr) 1935-05-28 1936-05-27 Perfectionnements aux produits fibreux feutrés, et procédé de fabrication de ces produits
DEJ55112D DE685424C (de) 1935-05-28 1936-05-27 Durch Aufeinanderschichtung von vorzugsweise plattenfoermigen Faserstoffpresslingen hergestellter Baustoff
GB14984/36A GB475819A (en) 1935-05-28 1936-05-27 Improvements in or relating to felted fibrous product and method of making the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23802A US2077720A (en) 1935-05-28 1935-05-28 Felted product and method of making the same

Publications (1)

Publication Number Publication Date
US2077720A true US2077720A (en) 1937-04-20

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US23802A Expired - Lifetime US2077720A (en) 1935-05-28 1935-05-28 Felted product and method of making the same

Country Status (4)

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US (1) US2077720A (de)
DE (1) DE685424C (de)
FR (1) FR809949A (de)
GB (1) GB475819A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746298C (de) * 1938-03-26 1944-06-15 Berliner Gipswerke L Mundt Vor Verfahren zur Erzeugung hochisolierender Massen
US2659412A (en) * 1950-12-15 1953-11-17 Moses D Heyman Means and method for producing a continuous sheet of integrated mica
US2720142A (en) * 1950-10-04 1955-10-11 Magnani Alessandro Method and apparatus for manufacturing endless fibro-cement sheets
US2731889A (en) * 1956-01-24 Method of and machine for producing
US2870819A (en) * 1952-02-06 1959-01-27 Moses Heyman Apparatus and method for forming a sheet of integrated mica
US3103031A (en) * 1961-06-14 1963-09-10 Gen Foods Corp Composite scouring pad
DE976908C (de) * 1943-04-27 1964-07-23 Samica Sa Verfahren zur Teilung von Glimmer in Schueppchen
US3173829A (en) * 1959-10-21 1965-03-16 Feldmuehle Ag Coating fibers dispersed in a gaseous carrier with a bonding agent and paper made therefrom
US3388028A (en) * 1964-03-06 1968-06-11 Kendall & Co Multi-layered nonwoven fabrics
US4911788A (en) * 1988-06-23 1990-03-27 The Celotex Corporation Method of wet-forming mineral fiberboard with formation of fiber nodules
US20030041987A1 (en) * 2000-05-24 2003-03-06 Armstrong World Industries, Inc. Durable acoustical panel and method of making the same

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1117031B (de) * 1956-11-02 1961-11-09 L O F Glass Fibers Company Verfahren zur Herstellung eines temperaturbestaendigen Gegenstandes aus siliciumhaltigen Fasern und einem Bindemittel
US3960652A (en) * 1973-03-15 1976-06-01 The Dexter Corporation Process of forming wet laid tufted nonwoven fibrous web and tufted product
US4042453A (en) * 1974-07-17 1977-08-16 The Dexter Corporation Tufted nonwoven fibrous web
AU535254B2 (en) * 1979-05-16 1984-03-08 Gaf Corporation Glass fiber mat
CA1147541A (en) * 1979-08-30 1983-06-07 Alfredo A. Bondoc Glass fiber mat

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731889A (en) * 1956-01-24 Method of and machine for producing
DE746298C (de) * 1938-03-26 1944-06-15 Berliner Gipswerke L Mundt Vor Verfahren zur Erzeugung hochisolierender Massen
DE976908C (de) * 1943-04-27 1964-07-23 Samica Sa Verfahren zur Teilung von Glimmer in Schueppchen
US2720142A (en) * 1950-10-04 1955-10-11 Magnani Alessandro Method and apparatus for manufacturing endless fibro-cement sheets
US2659412A (en) * 1950-12-15 1953-11-17 Moses D Heyman Means and method for producing a continuous sheet of integrated mica
US2870819A (en) * 1952-02-06 1959-01-27 Moses Heyman Apparatus and method for forming a sheet of integrated mica
US3173829A (en) * 1959-10-21 1965-03-16 Feldmuehle Ag Coating fibers dispersed in a gaseous carrier with a bonding agent and paper made therefrom
US3103031A (en) * 1961-06-14 1963-09-10 Gen Foods Corp Composite scouring pad
US3388028A (en) * 1964-03-06 1968-06-11 Kendall & Co Multi-layered nonwoven fabrics
US4911788A (en) * 1988-06-23 1990-03-27 The Celotex Corporation Method of wet-forming mineral fiberboard with formation of fiber nodules
US20030041987A1 (en) * 2000-05-24 2003-03-06 Armstrong World Industries, Inc. Durable acoustical panel and method of making the same
US6616804B2 (en) * 2000-05-24 2003-09-09 Awi Licensing Company Durable acoustical panel and method of making the same

Also Published As

Publication number Publication date
GB475819A (en) 1937-11-26
FR809949A (fr) 1937-03-12
DE685424C (de) 1939-12-18

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