DE1695391U - SOUND-SOUND DISK. - Google Patents

Description

Sound absorbing plate

The annoying reverberation in offices, work rooms, ffabrikh allen, Bant buildings etc · is generally made by attaching so-called Sound absorbing plates "eliminated * The number of those on the starch" Plates can be easily "described" by dividing them into two groups.

One group of sound-absorbing plates consists of a relatively porous material, s * B * made of pressed wood or sugar cane fibers, reeds, straw, seaweed, sawdust, etc. These plates are designed to increase their sound absorption capacity to a large extent . reach, usually provided with expressions or perforations. All panels in this group are characterized by the fact that they have a sound-absorbing effect simply because of their porosity without any connection to other materials.

The second group of plates consists of a combination of a solid perforated cover plate with a lying, porous material. Here the sound choking is only from the porous material libemommea lying on the back, while the perforated cover plate has only structural or decorative significance, .This group of sound baffle plates belong

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Reg, 51 -2-

for example combinations of perforated plasterboard, cardboard, tapei: Wood, puta etc. on the one hand, and glass wool, rock wool, foams of ί - especially synthetic foams, i.e. made with foam compound porous plastics of low specific weight -, etc. on the other hand at. These combinations are either made directly in Platter form or they are assembled on site.

All of the sound absorbing panels described above have the decisive factor that their surface is often perceived as architectural, unattractive due to the perforation. Their use is often neglected in spite of the existing technical need, because the perforation makes the image uneasy and, moreover , because the perforation can easily become dusty and dirty. They have sound-absorbing combination Natio ^ with a fixed per f orierten cover plate over the soft plates "the former group AEEN advantage of an on himself staubunempf smooth in & - handy surface, but they are each] all more expensive and technically uneconomical" because the cover plate not you? the actual purpose of soundproofing ^ but only serves decorative and constructive purposes. With them, too, the material parts of the perforation remain in place from an architectural point of view.

In order to avoid this disadvantage ©, with sound absorbing plates any material with perforation proposed according to the invention, which resulted from the perforation. Cavities gana or partially to be filled with a porous sound absorbing material, whose flow resistance is lower than the flow resistance the perforation was invisible to the plate material

Heg. 51 -3-

inachen »continues to be scored, the surface of the perforated Sheet with a porous »sound-permeable material evenly to cover, the flow resistance of which is equal to or equal to the flow resistance of the one introduced into the perforation 22eterials is. A particularly simple production results, if 5Ö11 and cover material are made of the same material

In this way it is achieved »that the necessary perforation in porous panels remains acoustically effective, but invisible and. is not accessible to dust »Perforation cavities made in solid * non-porous plates are made to be the primordial elements of the porous material * so that the perforation is closed ·

If one brings into the perforation clay soft silk-absorbing plates a porous staff * the flow resistance of which is less than that of the plate itself; the acoustic effect of the perforation »which is based on the enlargement of the panel surface» remains. If it is a question of soft wood fiber panels, then for example glass wool », stone \ ^! ^ ole »synthetic foam, etc.» serve »because the flow resistance of these porous materials is considerably smaller than that of pressed wood fiber» For filling the perforation, expanded buzzer is particularly well suited »because it can easily be brought in by machine: let the filled perforation pass through a coating with a very durable material, for example by a

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Heg. 51 -4-

Spraying process can be applied, made completely invisible. However, this material nut having a flow resistance "which is at most equal to the flow resistance of the Mllmaterials. As ijberzugsmaterial are also suitable ilischungen with glass wool or rock wool, synthetic foams, broken, crushed or whole-grain, etc. ι suitable for this purpose is also expanded mica, because to produce injectable mixtures from it, which have a low flow resistance despite a smooth surface »

If fixed to Schallsehluekung plates such as wood * or Higipsplatten be used, they are treated in the same way as the soft plates above "

FIG aeigt an embodiment aer new sound-absorbing plate, the sound absorption plate {1} consists for example of wood fibers "The perforation you came now to verscMede-nst © type and be FeiSe performed · The plate may, for example, with through holes (2), drillings (3) or longitudinal grooves (4) * The filling and covering material (5) ordered in this Pail from a mixture of Sunstschaumst off particles with a binding agent or from expanded mica with binding agent »- The perforation can be through the filling material, as the figure shows , only partially or completely filled out »

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Claims (1)

Heg. 51 -5- 8.2.55 Soiiut zansprueli 1.) Senallseliluek plate made of any sound-absorbing material with perforation, characterized * that the through the Perforation. Cavities in whole or in part and the Surface of the plate τόπι and laterally -with a porous Schallschluelnsmaterial are filled, de sow flow resistance is less than a flow resistance of the plate τ materials ..