Improved layer for impact sound insulation

Abstract

Layer (1) for impact sound insulation, wherein the layer (1) consists of an elastomer, the layer (1) has a bottom side (2) and a top side (3), wherein the bottom side (2) has waves with wave troughs (4) and wave crests (5), and the layer (1) has a minimum layer thickness (d1) in the region of a wave trough (4) and a maximum layer thickness (d2) in the region of a wave crest (5), wherein the layer thickness (d) is defined as the local distance from the bottom side (2) to the top side (3) of the layer (1), and the maximum layer thickness (d2) is less than 25 mm, characterized in that a quotient of an amplitude (A) of a wave formation and the maximum layer thickness (d2) is at least 0.27, wherein the amplitude (A) of the wave formation is defined as half the difference between the maximum and the minimum layer thickness (d2, d1).

Description

1. Field of the InventionThe present invention is based on a layer for footfall sound insulation, wherein the layer consists of an elastomer, the layer has an underside and an upper side, and the underside has corrugations with corrugation valleys and corrugation peaks, wherein the layer has a minimum layer thickness in the region of a corrugation valley and a maximum layer thickness in the region of a corrugation peak, wherein the layer thickness is defined as the local distance from the underside to the upper side of the layer, and wherein the maximum layer thickness is below 25 mm.2. Prior ArtSuch layers for footfall sound insulation are generally known. Purely by way of example, the material Mat-W25x from CDM Stravitec and the materials sound 10, sound 12 and comfort 12 from the applicant can be mentioned.Layers for footfall sound insulation are known from further practice in a wide variety of configurations. The maximum layer thickness of the respective material is, depending on the material, in the range of a few millimeters, for example 4 mm or 6 mm, up to considerably greater values of up to 25 mm. Cork, polyurethane, rubber, sponge rubber and other materials and mixtures of such materials are used as materials. Nevertheless, the dynamic stiffness, which in turn has an influence on the impact sound insulation, is not optimal.3. Object of the InventionThe object of the present invention is to further develop a layer for footfall sound insulation of the type mentioned at the beginning in such a way that, with the same material outlay, the dynamic stiffness can be reduced or the dynamic stiffness can be retained despite a lower material outlay.This object is achieved according to the invention by a layer for footfall sound insulation having the features of claim 1. Advantageous embodiments of the layer for footfall sound insulation are the subject matter of dependent claims 2 to 5 and are set forth in the attached description.4. SUMMARY OF THE INVENTIONThe invention relates to a layer for footfall sound insulation, in which the layer consists of an elastomer, the layer has an underside and an upper side, and the underside has corrugations with corrugation valleys and corrugation peaks, wherein the layer has a minimum layer thickness in the region of a corrugation valley and a maximum layer thickness in the region of a corrugation peak, wherein the layer thickness is defined as the local distance from the underside to the upper side of the layer, and wherein the maximum layer thickness is below 25 mm. According to the invention, this layer is designed for footfall sound insulation in that a quotient of an amplitude of a wave formation and the maximum layer thickness is at least 0.27, wherein the amplitude of the wave formation is defined as half the difference between the maximum and the minimum layer thickness.The invention thus provides a layer for footfall sound insulation which, while maintaining certain parameters of wave formation and the maximum layer thickness and taking into account the quotient of these parameters, is capable of ensuring optimum dynamic stiffness and thus footfall sound insulation. This result is also achieved using comparatively simple means and is easily remanufacturable without the need for complex material tests or the new development of unproved materials. The present invention provides significant advantages. On the one hand, high impact sound insulation results or-essentially equivalently-high vibration insulation results. On the other hand, comparatively little material is required.In particular, experimental investigations have led to the result that, with otherwise unchanged parameters of the layer for footfall sound insulation, a significant reduction in the dynamic stiffness occurs if the stated quotient is 0.27 or above.The effect is the greater the greater the quotient mentioned. In a preferred embodiment of the invention, it is therefore provided that the quotient of the amplitude and the maximum layer thickness is at least 0.30, particularly preferably at least 0.34, most preferably at least 0.36, at least 0.37 or at least 0.40. At present, it is particularly preferred if the quotient of the amplitude and the maximum layer thickness is in the range between 0.37 and 0.40, for example about 0.39, preferably exactly 0.39.The specific waveform may be selected as necessary. For example, the waves can be sinusoidal, rectangular or meandering, triangular or sawtooth-shaped in cross section through the layer according to the invention for footfall sound insulation. Mixed forms or superpositions of different waveforms are also encompassed by the inventive concept. A certain, preferably exactly formed periodicity is essential in the waveform, thus a repeating sequence of wave crest and wave trough, which is preferably formed uniformly over the entire surface of the layer according to the invention for footfall sound insulation. This creates a product which is simple to produce and provides constant properties with regard to impact sound insulation and dynamic stiffness over the entire surface of the layer.In a preferred embodiment of the invention, it is provided on the one hand that the maximum layer thickness is at most 20 mm, preferably at most 18 mm and particularly preferably at most 17 mm. As a result, the material outlay per square meter of the layer can be kept within limits. On the other hand, it is preferably provided that the maximum layer thickness is a minimum of 12 mm, preferably a minimum of 15 mm. This ensures a comparatively high mechanical stability of the layer as a whole.According to the invention, the bottom side of the layer is formed with the described waveform. The top surface may be corrugated or smooth as desired. It is preferred if the upper side is smooth and does not have a waveform which is comparable to the waveform on the lower side or whose amplitude measure mirrors or even exceeds that of the wave formation on the lower side.5. Brief Description of the FiguresFurther advantages and details are apparent from the following description of an exemplary embodiment in conjunction with the drawings. They show in schematic schematic schematic illustration of the principle: FIG. 1 is a plan view from below of a layer for footfall sound insulation, FIG. 2 shows the step sound insulation layer of FIG. 1 in a perspective view obliquely from below, and FIG. 3 is a section through the layer for footfall sound insulation along a line III-III from FIG. 1.6. Detailed Description of the FiguresThe figures are explained together below.A layer 1 for footfall sound insulation consists of an elastomer. In particular, the layer 1 contains no cork or only a small amount of cork, preferably a maximum of 10%. The elastomer may consist, for example, of recycled styrene-butadiene rubber fibers bonded with polyurethane. Alternatively, it may be, for example, a polyurethane foam, either original or recycled.The layer 1 has an underside 2 and an upper side 3. The underside 2 is that side of the layer 1 which is at the bottom when the layer 1 is used as intended, that is to say rests on another support, not shown, for example a raw ceiling. Conversely, the upper side 3 is that side of the layer 1 on which, when the layer 1 is used as intended, another support, likewise not shown, for example a screed, in particular a dry screed, rests or at least can rest.The top 3 is preferably smooth. The underside 2, on the other hand, has corrugations with corrugation valleys 4 and corrugation peaks 5. In the figures, only a single wave trough 4 and a single wave crest 5 are provided with their respective reference numerals. The shape of the wave crests 5, which is particularly apparent from FIG. 3, namely a more or less vertical rise, which is then terminated by a curved crest, is shown merely by way of example; the wave crests 5 can also have a different shape. Likewise, the shape of the wave valleys 4 that can be seen from FIG. 3, namely a flat plateau, is also illustrated merely by way of example; the wave valleys 4 can also have a different shape. A wavelength λ is usually in the two-digit millimeter range, for example between 30 mm and 50 mm.A layer thickness d of the layer 1-the layer thickness d is defined as the local distance from the bottom side 2 to the top side 3 of the layer 1-varies between a minimum value d1 (=minimal layer thickness d1) and a maximum value d2 (=maximal layer thickness d2). Specifically, the layer 1 has the minimum layer thickness d 1 in the region of a wave trough 4 and the maximum layer thickness d 2 in the region of a wave crest 5.Due to the wave formation, i.e. the presence of the wave valleys 4 and the peaks 5, an (absolute) amplitude A of the wave formation results. The amplitude A of the wave formation is defined as half the difference between the maximum and the minimum layer thickness d 2, d 1:This is therefore the amplitude A of the fluctuations of the layer thickness d around an average value of the layer thickness d. The amplitude A is an absolute, dimensional variable. Their unit is (in the SI system) meters or (in general practical use) millimeters.If the quotient of the amplitude A and the maximum layer thickness d2 is formed, a relative amplitude a is obtained:The relative amplitude a is thus related to the maximum layer thickness d2. The relative amplitude a is a dimensionless quantity.According to the invention, the maximum layer thickness d2 is, on the one hand, less than 25 mm. However, it can also have even smaller values, for example, at most 20 mm. It is particularly preferred at present that the maximum layer thickness d2is at most 18 mm and in particular at most 17 mm. The maximum layer thickness d2, on the other hand, should preferably not be too small. At a minimum, the maximum layer thickness d2should be 12 mm, preferably at a minimum of 15 mm.According to the invention, on the other hand, the relative amplitude a--that is to say the quotient of the (absolute) amplitude A and the maximum layer thickness d2--is at least 0.27. The relative amplitude a is preferably even greater values, for example at least 0.30. Particular preference is given to values of at least 0.34, at least 0.36, very preferably at least 0.37. At present, a value between 0.37 and 0.40 is considered optimum, in particular approximately or even exactly 0.39.The above description is only for explaining the present invention. On the other hand, the scope of the present invention is intended to be determined solely by the appended claims.List of reference characters1 Layer 2 Underside 3 Top side 4 Wave troughs 5 Wave peaks A Amplitude d, d 1, d 2 Layer thicknesses λ Wavelength

Claims

Layer (1) for footfall sound insulation, wherein the layer (1) consists of an elastomer, the layer (1) has an underside (2) and an upper side (3), wherein the underside (2) has corrugations with corrugation valleys (4) and corrugation peaks (5) and the layer (1) has a minimum layer thickness (d1) in the region of a corrugation valley (4) and a maximum layer thickness (d2) in the region of a corrugation peak (5), wherein the layer thickness (d) is defined as the local distance from the underside (2) to the upper side (3) of the layer (1) and the maximum layer thickness (d2) is less than 25 mm, characterized in that a quotient of an amplitude (A) of corrugation formation and the maximum layer thickness (d2) is at least 0.27, wherein the amplitude (A) of the wave formation is defined as half the difference between the maximum and the minimum layer thickness (d2, d1).Layer (1) according to Claim 1, characterized in that the quotient of the amplitude (A) and the maximum layer thickness (d2) is at least 0.30, preferably at least 0.34, more preferably at least 0.36, at least 0.37 or more preferably at least 0.40.Layer (1) according to claim 1 or 2, characterised in that the maximum layer thickness (d2) is at most 20 mm, preferably at most 18 mm and particularly preferably at most 17 mm.Layer (1) according to one of the preceding claims, characterized in that the maximum layer thickness (d2) is at least 12 mm, preferably at least 15 mm.Layer (1) according to one of the preceding claims, characterized in that the upper side (3) is of smooth configuration.

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