DE1772119A1 - Layered sound absorber - Google Patents

Description

national Gypsum Company Buffalo, ff.Y., V.St.JL.

Layered Schallachlucker

The invention relates to an improved sound eater the kind that causes both damping and noise suppression

Due to its basis, the sound-absorbing plate is designed in such a way that it both steams and swallows sound can · S · are basic experiments that are carried out in a Testing of these acoustic properties can be applied. The first is a sound transmission test that helps the sound absorber to muffle a sound, i.e. its ability to prevent a sound from to be transmitted through him. A long attempt is made for you Noise suppression attempt, which determines how much device the sound eater is abiorbated. Zn big Trains are assisted by an attempt to transmit noise • One of the vision of noises on one side a partition and the measurement of the level decrease,

if there

goes. De

Sound up through the ceiling on one

Open uni through the blanket down on the other side The attempt to suppress noise consists in creating a single sound on one side of a disk and des Messjtn de · Degrees · des Abrefall de · Sound level in that Baus, creating a basis for calculating the absorbed quantities.

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So far, the damping has been made self-sufficient by attaching a layer of metal foil to the Back of the sound absorber, i.e. the side that improves the tone of the roughness in which the sound is produced was turned away. The film layer acted as an air barrier and in this way reduced sound transmission through the sound absorber and therefore causes it on · attenuation. However, the metal foil had an adverse effect on the noise reduction characteristics of the The side of the plate, on which it is safe, because it is the .sound waves never reach the hollow surface of the plate lie J. Bm was undesirable because the plate on which Beck attached, sound au * des Bau ", in de" si · ssJ, steams ·, but no sound that arises outside the tree, for example from the floor above the ceiling, attenuates. The metal foil therefore improved the dampening properties of the plate, but had no effect on the noise reduction ", igMU" shaft of the plate side compared to the full plate, but reduced the ability of the side of the plate to form the rear side to sahluoken. In the past there was no MegXleh * keit, «la · silencing aod an O» rättschunt «» drtlat] iag At the same time, you can achieve this because you have the metal foil on the back of a plate on this side makes a sound absorption ineffective · and essentially a sound leakage on one side of the plate · and sound attenuation is mutually exclusive.

In addition, the metal foil on the back was subject to one Schallsohluoker's certain parts of the tile. As the metal foil was thin, it was easily damaged in handling

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and be destroyed, and when this happened, the air was impermeable Layer it offered injured, so that the damping properties of the plate were reduced. Besides that caused the use of .de »metal foil on a Plate side costs for the foil itself and others for attaching them. With an improved sound absorber that has the aforementioned disadvantages of the earlier sound absorbers eliminated, the present invention is concerned. I.

Accordingly, it is an object of the invention to provide an improved scbJLlechlucker which has good soundproofing and also has good noise canceling properties on both sides, considering that previously a modification of a plate to improve its damping property a deterioration in (noise suppression property resulted in one of the pages

Another object of the invention is to provide an improved method of manufacturing the sound absorber in which the sound-absorbing layer is applied simply, easily and at a relatively low cost over previous methods of application.

Another object of the invention is to provide an improved sound absorber which has a sound-absorbing layer which is incorporated into it so that it is, arranged between layers of the sound absorber, secured against destruction during handling and installation. Further goals and associated advantages of the

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invention can be easily recognized from the following.

In other words, the invention relates to an improved Schallechluoker, which as a laminated body with a sound-absorbing Rüokenschicht, a sound-absorbing Front layer and a substantially continuous, noise-absorbing layer therebetween, which is shown in this example is a layer of latex paint.

The improved method of making the sound absorber is to apply a layer of latex paint to the back layer immediately after it is formed, while she is still in a foul condition. The front layer is in turn applied to the dampening layer, and all three are dried on the same side in a drying oven. The waeeer base of the middle, The sound-absorbing layer can mix with the water of the front and back layers, and this is why it is inclined Layer not to deposit either in the sense of a separation of the front from the back layer · Indeed this acts as a bond, which attaches the front and back loops to each other

Veil the sound-absorbing sohioht is made both by the RUoken and also by the Vorderachloht, remains they are intact both during handling and when applying, so that the properties are not lost, that it is supposed to produce. In addition, the layer of paint achieves its sound attenuation just as well as it has up to now was achieved by the metal foil applied to the outside of the Ruokenschloht, but impaired not the noise-reducing properties of the Rüoken

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sohieh, wit earlier the metal foil, because it stains die Hiickenaohioht uabtdtokt IHAt. The finding according to tioh Understand btsstr if the following terms apply to be read in conjunction with the attached newspaper} in diettr itt

fig. 1 is a perspective view of the improved

Schalltchludkers after dtr invention and Jig · 2 tin partial cut essentially along the line * 2 - 2 in ^ ig. 1.

Dtr improved Schaltohlucktr 10 dtr invention has tine aUokensohicht 11 of gefilater mineral wool in a starch binder and a front layer 12 of cast mineral wool in an ink starch binder, whereby the bti- <ta layers are interdependent due to their starch content, as will be explained in the following · The front layer 12 contains cracks 13, which are caused by tin usual healing methods ₍ uv tin travtrtin-like appearance tu produce, the tinesi aesthttitohtn Btandiunkt from very vttntohtntwtrt bit ^ itt — disregarding the previously mentioned parts dtt geeohiert

loan with the in dt «

iehaUtohiuoktrt stiait in everyone

WUrHttat 3 W 549 bttohritbentn practiced, on whose content BtBUg gtaotsitn. Only the essential passages in the patents mentioned are repeated here with flowing explanations and completeness.

The addition of arrows according to weight percent in trookenea Zuttande was obtained in the trtnetn mentioned below!

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Baktr-ϊοη 6-10

Pearl strength 7.1 - 10.2 Vachsemulsion 1-251-A 0.6-0.7

Boric acid 0.6-0.7

Dowioids + A 0.04-0.05

Dowicidt + 9 0.04-0.05

Mineral wool 75 - 85 moisture, maximum 1.5

The commercial method for producing the back layer 11 of the sound absorber 10 is preparation a «chalk water with starch and dowioids A and 9 as well as all the listed additives that are not anaghließend The mineral wool is added to the above-mentioned chalk water in a turbint-like agitator, and the two are mixed well with one another. Tue « Misohung is pumped into and out of a storage tank The chalk water with the mineral wool is pumped to this through a shot separator, in which fresh binding agent is added. The resulting solution is injected into an Oliver slab mold door, and in this slab former is Filed the material on a rotating cylinder, which has a vacuum inside, and which so fil «- The cash register is placed in flat bowls. The wool used for the connection can consist of fiber lengths τοη about 9.5 to 12.7 mm and possibly up to 19 M »

.After the invention, the matted mass is shaped in the manner described above and as long as it is nooh moist is, a layer 14 is made of water-soluble, lattx-like Dye in a weight quantity of 220 - 22 g per no by means of a /? e? meten paint spraying device on the Mass * injected, which the spraying can get when

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the damp matted hates from the OliTer tablet former transferred to a sponsor. A commercially available color that has been found to be commercially satisfactory is on the market under the trade name Gold Bond Velvet Enamel and is a product of National Gypsum Company. It is a semi-gloss glaze, which essentially consists of a latex or resin emulsion base which is diluted with water and contains approximately 50 Jt solid components? she is through Specification No. 72-7-10-4 Primrose Later Enamel set. The strength of the color layer 14 is in the drawing for an explanation exaggerated, including the latex color is sprayed onto the damp back, the coating is finished and applied to the layer of paint. The composition of the pad by weight in the dry state is approximately in the following örensens

Polyox + 0.23-0.46

Boric Acid 0.9-1.0 Tex-0 Film # 4838 Sttttce 6.34-9.5

Alien tone 11-14

Pieces 3-4 guard emulsion X-2d1 -A 1.4 - 1.8

Mineral wool 70 - 75

Moisture, most of all. 1.5

When making the outer surface, the binding agent, which consists of all parts with the exception of the wool, prepared by placing the Polyox + WRS-301 completely in cold Water is dlsperglert and the other additives in added in the order given above. The mixture is then heated to 90 ° C and on this Temperature for a long enough time to allow the star

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Ke to cook properly, usually no less than five minutes. The binder and mineral wool are then fed simultaneously and steadily to a twin screw mixer such as that manufactured by the Sprout Valdron Company. In the solution the water has a content of 50% to 75 i "of the total amount. The twin screw mixer mixes both into a dough-like mixture, which is placed on the previously described layer of latex paint in the wells on the moist back. While the front layer is still in a damp state. it is then subjected to a mechanical tearing process in order to obtain the travertine-like appearance shown in the drawing. The layered tiles formed in this way are ^{then baked at a maximum of 1Θ0 0} 0 for no longer than six hours) then the temperature is reduced to 150 ° C -5 ° C for a further 5 hours, whereupon the temperature is reduced to 138 ° 0 ± 5 ° 0 until the tiles are dry, i.e. less than 1 Ji of their above mentioned moisture content.

The composition of all components of both the goal area and the back is detailed in Column 6 of U.S. Patent 3,233,649 reproduced, hler but once more listed for the sake of completeness.

The PolyOi ⁺ W3R-301 is a product of the Union Carbide Company and consists of ethylene oxide polymer including 2% ash and about 4% by weight of moisture. In addition, this material has a focus point YOn 65 - 75 ° C, a brittleness temperature of - 50 ° O and a molecular weight of 4 · 10 ·

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The boric acid has a minimum purity τοη 99 »5 Jf and ei-η · η maximum content of chloride τοη 0.01 Jf, of sulphate τοη 0.1 J <and bis τοη 0.0005 % ·

The Tex-O-Pilm lir. 4838 is a product of the Gorn Product Sales Company and is a Milo starch with 12.5 J * moisture Ih maximum, 0.5 J < Ische content and a p "τοη et" "6.0 to 7, CU

The Alien Clay is a testimony of the United Clay Mines,

*. Ino., And a typical analysis shows the presence the following constituents in % t silicon dioxide 45.02; Magnesium 0.14; Alumina 38.32; Iron oxide 0.46; Calcium oxide 0.06; Alkalis 0.36; Titanium dioxide 1.66. Also, the Pjj-VBrt is 4.8 and it has a grain size τοη that can go through a 325 Maeohen sieve τοη 99 pounds. The only fundamental difference between the Alien tone and the Baker tone is the Parbe.

Per Gypsum stucco has a consistency τοη 49-55 ml. According to ASTH designation C472-61, a minimum settling time τοη 42 minutes and a grain size at which 0.4 % is the maximum value on a »USA sieve ISr · 30 is withheld, and 87 Jf is the minimum amount you can go through a USA-8 rJ 100 Hindu.

Ott / Vaohsemulsion 1-251-A is an Xrseugnia from Amerioan Oyanaaidj Company, where X-251-A is the idaase name. It looks from an emulsion τοη Vache in water, wove! dl

Pest parts 47 - 1 % are, and has a stand function

ability to 6 months at 24 ° E.

01 · Mineral wool, which · forms part of the front of the ohiohtiiten 8challsohluokere, is a grain size τοη

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Mull Bozent plus 19 mm-Sitb and 5 to 25 % plus 12 mm ~ sieve and has a diameter τοη 3 to 30 microns.

The mineral wool which is used in baking has a grain size in which at least 30 % remains on a 19 mm sieve and a maximum of 20 Jt can pass through a 6 mm 31eb, and a diameter of about 3 to 30. Micron.

In addition, both mineral wools have a composition of 38-42 % silicon dioxide, 36-40 % calcium oxide, 6-10 % aluminum oxide, 4 - 8 Jl magnesium oxide and less than 1 % of the trace elements bis, titanium, manganese and sulfur.

The pearl starch is a white corn starch and has between 10.5 and 13.5 % moisture and contains 0.1 % ash (at most), at most 0.3 % protein, at most 0.1 H fiber, at most 0.1 H water-soluble Substances, not more than 0.003 % SOj:, not more than 0.1 pounds of fat, at least 86 % < starch after deduction and has a Pjj-Vert of 5 to 7 ι Dowloido A is a product of the Dow Chemical Company and is flaky with a solubility in water of 0.122 g per 100 g and contains at least 97 % active ingredients with iosodium orthophenylphenate and at least 3 % inert ones

Bestaoi parts. The Pg value of the saturated water drainage is 25 ° E between 12.0 and 13.5.

The Dowicide O is “in letter Dow Ohemloal Oosipany and flooky and contains at least 90 % sodium aala; of pentachlorophenol as well as maximum 10 % inert B - | itandtfil *. The flaky material has a Mindeetlös-. j liohkeit Of 33 β in 100 § water at 25 ° O.

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All the names in the previous listing that a Having crosses are trademarks. »

Ächallschlucker manufactured in the manner mentioned are has been investigated for sound transmission and noise reduction · Sound closers with a dimension of 300 times 300 mm and a thickness of 19 mm with a thickness of the bridge layer of about 12.5 mm and the front rail of 6.3 m were tested according to a ceiling sound transmission test Geiger * and Hamme subjected to the No. NG-264 FT (Continuous construction) received. Sound absorber after of the above-mentioned composition, but with a foil back, namely an aluminum foil of 0.00625 mm Strength on a Kraft paper No. 20, which was applied to the ächall-8chlucker, which was 19 mm thick, were the same Deoken sound transmission test according to Geiger and Subjected to Kamme, which received No. NG-233 FT. All 3 sound absorbers with foil prints mentioned in this description have the foil back as described above. The Geiger and Hammer test mentioned corresponds to the Acoustic Materials Association test 1-11-1963. The following result β β was obtained

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Table A.

Sequence
Vibrations je seo. Plate 300
Standardized χ 300 χ 19 mm
Damping factor. inDecibel 125 Try N & -264 FT
with color between
between front and
back Try HO-233 FT
with edition of a
Metal foil on
the back 177 35 31 250 39 40 354 31 32 500 37 39 707 37 40 1000 41 44 1414 45 · 45 2000 50 48 * 2828 59 56 4000 62 56 Average of
11 frequencies 62 52 Sound transmissions
Great 45.2 43.9 ) At this point is
Table again / reeebei 41 44 to note that each
his test result in the above
ι Puroh * son1 tt

10 individual experiments made for the experiments at each frequency with the same material, over one Average value to be obtained · The damping factor is: a NaA of the deodorant decrease due to · the damping of the plate. The ver j Buohe proved that the product according to the Brfinduag has just as good sound insulation as the product with the torture back, ait ee rergliohen was

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The Schallachluoker according to the invention, i.e. plates of 300 300 χ 19 mm were put together to form a surface of 6.5 square meters, which was subjected to a River Bank Laboratories test No. 166-115 * and received an assembly Gtorttusch reduction coefficient (NRC) No. 7 of 0.68, which is in the range of 0.65 - 0.7 falls as in of the following table, in which the number given for each frequency is an average of at least 50 * individual tests made · The NRC-Vert is the average of four Verton. Any number Indian The table shows the proportion of sound absorbed at each frequency

Table B. Plate 300 x 300 χ 19 mm

frequency With color between With foil layer 30 * 1 * 1 run ¹ * \ 4νη per see Front and back on the back side . 125 0.42 0.32 250 0.45 0.39 500 0.52 0.62 1000 0.77 0.86 2000 0.97 0.86 4000 0.99 0.71 Qq TtfMff irtuii itd ffTTifur coefiiiient 0.68 0.69 ! I10- »ereioh 0.65-0.70 0.65-0.70

Di jpleütuaf dtr attempt reproduced above 11 ***, darie, that the flaohe both of the gap old of the foil front side as well as of the invention made • • 1

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The following experiments, commonly called the "Box ^M experiments," were also carried out for each type of panel 300 χ 300 mm-Bndtn closed 1st. The ceiling is open and offers a structure for placing three panels of 300 300 mm side by side to create a panel surface of 0.27 square meters. A microphone is at one end of the box and a loudspeaker is placed at the other end. Measured noise figures are sent at frequencies of 256, 512, 1024 and 2Ο4Θ Hs from the loudspeaker and the microphone picks up the amount of noise that is not absorbed. Two readings are taken at each frequency, the Plates are in a different position for each reading The table below shows the amount of noise that is absorbed at each frequency he numerical average of the absorbed at each frequency beer sound.

Table ρ

4 ^ ayun gskoef i lslsaten

Hit Metallfolienaoüicht With color layer iwiaohen a ^ f the back front and Mlokseita

front back front back

0.65 - 0.7 0.3 - 0.35 0, ^ 5 - 0.7 0.55 - 0.4 0.65 - 0.7 0.3 - 0.35 0.45 - 0.7 0.55 - 0.6

• Τ

Is is readily ersiohtlioh, d * J dar "load- ^ Versuoh for the front dss material la essential» Both for the improved layer structure and the BrfindUBf

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as well as for the earlier sound absorber with the foil back side is the same. In doing this Search for a box to determine the G-noise suppression coefficient on the back of the plate, but it can be seen without further ado that there is less noise from the Back of the panel with a film as absorbed by the panel rubble with the layer structure according to the invention. In this regard, the noise reduction coefficient of the layer structure was 0.55-0.6, while the film-covered rear side of the plate had a noise reduction coefficient of 0.35-0.35. That proves the superiority of the sound absorber according to the invention in absorbing sound from the back of the panel. As already mentioned briefly, the sound absorber can effectively absorb sound according to the invention that comes from the outside of a room in which the sound absorber is installed. ,

As a result of the arrangement of the paint layer between the layers of the plate, any tendency of the paint to spread fire can be effectively suppressed.

Although the invention has been described with reference to a preferred type of panel composition, it should be noted that the outline of the invention applies to each changes type of sound absorber to apply.

1 «results from the fact that the improved, stratified The sound absorber of the invention is a product that is generally lower in cost than products with a Metal foil can be produced on the back, and because of the nature of the construction it is sound-absorbing

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Layer protected by the front and back of the plate from damage during handling or otherwise is. It is also shown that the improved sound absorber according to the invention not only has the same attenuation properties like the previously used plate with the metal foil on its back, i.e. the ability to prevent sound transmission through it, ^ but also a better G-noise suppression coefficient due to its property of absorbing sound from the front as well as from the rear, what with the plate with the foil on the back cannot be achieved.

While discloses a preferred embodiment of the invention has been, it goes without saying that the drug discovery this is not limited, but also different in the context of ~ men of the following claims can be carried out.

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Claims (1)

Expectations : •) A method for producing a sound absorber with sound dampening and noise suppression properties, characterized in that a sound-absorbing lower layer (11) is prepared in a moist state, an essentially thick intermediate layer (14) made of sound-absorbing material is applied to the lower layer and a damp one , sound-absorbing top layer % (12) is applied to the intermediate layer and the sound absorber is dried. 2. The method according to claim 1, characterized in that the intermediate layer (14) consists of a water-soluble latex paint and is applied by spraying. 3. Schallachlucker according to the method according to claim 1 and 2, characterized in that it consists of a sound-absorbing Lower layer (11), a sound-absorbing upper layer (12) and a sound-absorbing intermediate layer (14) exists in between. I. 4 sound absorber according to claim 3, characterized in that since the sound-absorbing layer (14) consists of an essentially uninterrupted film of paint. 5 sound; chopper according to claims 3 and 4, characterized by it, that the upper layer (12) has a 3 noise suppression coefficient from a few to 0.65-0.7, the lesson (11) a noise suppression coefficient 009885/0901 of at least 0.55 - 0.6 and the sound absorber one Has a damping factor of at least 45. 6, sound absorber according to claims 3 to 5, characterized in that the paint (14) is a water-soluble latex paint 7. Sound absorber according to claim 3 to 6, characterized in that the top layer (12) made of mineral wool in a »starch binder and the underlayer (11) matted mineral wool consists of a starch binder 009885/0901 BATH ORIGINAL