JPH062988B2 - Carpet member and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a soundproof carpet member that is internally mounted in a vehicle in a non-fixed state to reduce internal noise of the vehicle, and a method for manufacturing the same.

The low internal noise level of motor vehicles, especially passenger cars, is an important selling point under today's demands for noise comfort. Therefore, the industry has developed a number of materials and systems for soundproofing passenger cars, which are today embodied in production.

Based on the dimensions of the passenger compartment and the excitation of the engine's vibration spectrum at a frequency corresponding to this, particularly in a four-cylinder vehicle, annoying noise is generated in the region of the ignition vibration frequency (second engine rank), and When the level is measured, it appears as a resonant frequency that can be clearly heard depending on the rotation speed. Therefore, a general goal of soundproofing measures is to avoid such a resonance phenomenon. The level increase with the rotation speed should be made as uniform as possible.

For the relationship between engine speed and the resonance phenomenon in the passenger compartment, refer to the article (Ch. Betholt "Effect of sound insulation of airborne sound on internal noise of road vehicles", Glass Manufacturing Yearbook, Vol. 87, No. 2, February 1963, 63-
66 pages, Georg, Siemens Book Sales, Berlin and Bielefeld (Betzhold, Ch, "Der EinfluB der L
uftschalldmmung auf das Innengerusch von StraB
enfahrzeugen ", Clasers Annalen, Georg Siemens Verlag
sbuchhandlung, Berlinund Bielefeld) K. Kurz, "On the Explanation of Some Typical Frequency Analysis of Internal Noise," op. cit. 87
Volume 4, April 1963, pp. 207-210 (Kurz, K "Zur Deutun
g einiger typischer Frequenzanalysen von Fahrzeugi
nnengeruschen "), VDI standard 2574" Points on the evaluation of the internal noise of automobiles "[Richtlinie VDI 2574" Hin-
weise fur die Bewertung der Innengerausche von Kra
ftfahrzeugen "]). It is also known to place the resonance frequency of a soundproofing system configured as a mass-elastic system outside the range of disturbing engine frequencies. At depth, especially when the thickness of the soundproof layer is almost uniform, increasing the mass can shift the resonance frequency to a very limited extent. , The thickness of the plastic foam layer of the soundproof member is different, and the unevenness is provided (West German Patent No. 20).
See 64445 specification).

The use of decorative items, such as carpet components, as soundproofing components is also increasing for increased comfort and in view of the most rational mounting of belt conveyors. This method is described in a series of patents or patent applications. In that case, it is known per se to use a sound insulating and heat-insulating underlayer and also a carpet element in combination with a soft elastic material, for example foamed plastic. Data on it can be found in DE 3043674 "Extrudable material for the production of thermoplastic sound-insulating underlayers for carpets and carpets with such extrudable underlayers and methods for their production". There is. Another similar solution is described in West German Patent Application No. 8108567, "Soundproof Carpet and Method of Making It" and West German Patent Application No. 280934.
It is described in No. 7 "Method for producing molded soundproof floor material or floor coating material and product obtained in that case".

However, the above three publications only describe the spatial arrangement of this type of system, or only describe a particular manufacturing method. Neither the problem of shifting the resonance frequency in the mounting of the member in a limited fixed space has been addressed, nor has a solution to this problem been suggested.

West German Patent Application Publication No. 2538607 "Soundproofing Material" describes a three-layer structure consisting of carpet / thermoplastic / foam. In that case, the thermoplastic layer and the foam layer may be interchanged, but the humming is not good. Again, there is no mention of shifting the resonant frequency to eliminate noise. The same applies to West German Patent Application No. 3104835, "Back surface foam treated textile flat lining and its manufacturing method". this is,
Describe the lower layers that can be combined in different forms. However, it does not mention the special problem of shifting the resonance frequency from the engine noise region. Furthermore, reference must also be made to West German Patent Application Publication No. 2006741.
This is a content that almost preempts the West German Patent Application Publication No. 2538607, and is entitled "Multi-layer sound insulation member for a vehicle body made of pressed iron plate". This publication comes from a special area of the automobile industry, but does not contain any suggestion of solving the problem of shifting the disturbing resonance frequency.

In all the publications mentioned above, the acoustic effect of the arrangement of the various members is uniformly referred to as soundproofing;
For the purpose of avoiding disturbing resonance oscillations, no description can be found about the optimization of the resonance frequency band, ie the possibility of shifting the resonance frequencies.

Therefore, it is an object of the present invention to prevent the resonance frequency of the soundproof member from interfering with the mounting of the member in a predetermined space regardless of whether the member has a uniform thickness or an uneven thickness distributed in a plane. It is to present a sound insulation system in the form of a decorative or carpet component, which allows the internal structure to be easily adapted to the particular acoustic conditions of the vehicle in question, such that it lies outside the range of dynamic engine frequencies.

The above object is achieved by a carpet member and a manufacturing method thereof, which are described in the claims and which will be apparent to those skilled in the art from the following description. In the present invention, the heavy layer (dense
The meaning of "layer)" is synonymous with "high density layer", and the type of material and its manufacturing method are not particularly limited in the area of sound insulation.

Thus, according to the present invention, the mass-elastic system (mass
-A spring system) that acts as an elastic body of this system and changes the flow resistance of the viscoelastic or soft elastic layer, which is necessary for the mass-elastic system. A soundproofing member in the form of a carpet member is provided. The carpet member according to the present invention is mounted on a steel plate of a vehicle body in a non-fixed state and in a shape-constrained manner, and the steel plate of the vehicle body functions as a component of a double wall system or a mass-elastic system. At least two soft elastic or viscoelastic elastic layers having different flow resistance, for example, made of foam or the like, are in contact with the iron plate of the vehicle body, and as a mass layer on the opposite side of the double wall system, on this double layer, A heavy layer follows, which is as soft as possible, ie has a low elastic modulus. The heavy layer carries the carpet layer as a decorative and outer enclosure on the front side facing the passenger compartment.

In this case, the elastic layer made of foamed plastic or the like may be arranged as follows according to the resonance frequency band of the passenger compartment. That is, an elastic layer of foamed plastic or the like having a low flow resistance corresponding to a relatively small absorption of airborne sound when transmitting sound is in contact with the iron plate of the vehicle body, and even a small layer thickness enables effective sound absorption. Followed by a relatively thin elastic layer, such as foamed plastic with flow resistance.

Such an arrangement constitutes a low tuned mass-elastic system. This system is suitable for an automobile whose resonance frequency is in a range other than this tuning frequency band.

If the resonance frequency is in a range corresponding to the resonance frequency of the above-mentioned system, for example, it is desirable to shift the resonance frequency to the high frequency side without changing the relationship between the mounting space and the mass (weight). It is a particularly important advantage of the present invention that the above can be simplified according to the present invention by changing the stacking order of the elastic layers such as the foamed plastic. In that case, the elastic layer with a high flow resistance is on the iron plate, the elastic layer with a low flow resistance is connected and sealed, that is, the flexible layer, that is, the heavy layer having a low elastic modulus, or the steel straight line,
That is, followed by a heavy layer and a carpet layer having a high value of elastic modulus. Surprisingly, the swapping of the two elastic layers results in a range shift over several thirds of the resonance frequency.

Especially by taking advantage of the acoustic effects of different flow resistance of the composite elastic layer combined with the carpet layer and the heavy layer,
It was also unknown that the resonance frequency could be shifted in this way.

The chemistry of the foam and the like used is not relevant to the invention per se. It is possible to use all foamed plastic materials and the like which enable the actual manufacture of the component and which are used for this kind of purpose. In that case, however, urethane foam is particularly suitable because of its good workability and large variation range.

Flow resistance is also practically suitable for fully characterizing the acoustic behavior of porous materials.

In the present invention, the flow resistance is related to the speed of sound propagating from one side of the elastic layer to the other inside the elastic layer and the thickness of the elastic layer.

In any case, the flow resistance along with the geometric reduction of the pores,
The increase is obvious.

Such flow resistance is described in "S. Hilzel Publishing Co. Leiptig, 1950, Today's Physics and Technical Acoustics Department (Physik u
nd Technik der Gegenwart ABTEILUNG AKUSTIK S.HIRZE
L VERLAG LEIPZIG, 1950) "," Scientific basis of acoustic effects, Volume 3, Wave-dynamic acoustic effects, "written by Die wissenschaftlichen Grundlagen der Raumak.
ustik BAND III WELLENTHEORETISCHE RAUMAKUSTIK Vo
n Dr.-Ing.LOTHAR CREMER) "and" Fauwe Technology Publisher, Berlin, 1984, Pocket Edition Acoustics, Part I,
Edited by Wolfgang Fasold, Wolfgang Clark, Werner Scheelmer (Taschenbuch Akust
ik Teil 1 Herausgegebe von Prof. Dr.-Ing. Wolfgang F
asold, Prof.Dr.-Ing.habil.Wolfgang Kraak, Dr.-Ing.We
rner Schirmer VEB Verlag Technik, Berlin, 1984) ”.

Next, the present invention will be described in more detail with reference to the drawings.

Referring to FIG. 1, a possible embodiment of a carpet member according to the present invention comprises the following layers when viewed from the passenger compartment side. That is,
There is a carpet layer 1, preferably a flexible heavy layer 2 of eg 3 mm, a thin foam layer 3 of eg 10 mm with high flow resistance and a thick foam layer 4 of eg 20 mm with low flow resistance. The above-mentioned carpet member is placed in a non-fixed state on a steel plate of, for example, 1 mm of the vehicle shown by reference numeral 5 in the figure. The carpet layer 1 acts as a decoration, and provides an outside noise barrier to the passenger compartment. Such a carpet member is combined with an iron plate of a vehicle body to form a soundproof double wall system. A thick elastic body is usually inserted between the two wall gallery thicknesses or intervals. In this case, the thick elastic body is composed of two foam plastic layers 3 having different flow resistances.
And 4. Since the carpet member according to the invention is preferably mounted in a vehicle in a non-fixed state, first of all, for soundproofing, the friction damping between the foam and the body iron plate is used. As a result, first, a part of the energy is taken from the acoustic energy transmitted as the airborne sound. Relative motion continues in the boundary layer between the foam with low flow resistance and the foam with high flow resistance. Flexible heavy layer 2
Does not perform much bending vibration, the boundary layer between the foam 3 having a high flow resistance and the flexible heavy layer 2 is in a quasi-static state. Further, in that case, the energy absorption by the air propagation sound absorption of the foam 4 having the low flow resistance and the foam 3 having the high flow resistance is effectively recognized as the attenuation of the air propagation sound.

Finally, the above-mentioned combination utilizing various energy absorption effects forms a mass-elastic system that is tuned to the bass range and has a high sound insulation effect. The resonance frequency of such a structure is known (see, for example, L. Kremer "Lecture on Industrial Acoustics").
Springer Publisher, Berlin-Heidelberg-New York, 1971 [Cremer, L. "Vorlesungenuber tech
nische Akustik ", Springer-Verlag, Berlin-Heidelberg-
See New York,]). FIG. 2 shows the relationship between the sound attenuation process and the frequency.

When the resonance frequency is to be shifted to the high frequency side without changing the relationship between the mounting space and the mass (weight) for a predetermined purpose, the foamed plastic layer 3 having a high flow resistance should be placed on the iron plate. You can easily do so by arranging in. Foamed plastic with low flow resistance 4
To it, followed by a heavy layer 2 and a carpet 1. Figure 3 shows that there are some surprising three
It shows that the deviation of the resonance frequency over the pitch is obtained.

In any case, the heavy layer 2 can be flexibly formed. However, it may be necessary to rigidly adjust the heavy layer, because stability of the feet is desirable in the aforementioned soundproofing system.

This does not change the range of the resonance frequency once adjusted, and the relationship between the course of the attenuation and the frequency is only affected by the decreasing direction of the attenuation effect.

In this way the damping effect is influenced by the rigidity or flexibility of the effective heavy layer. This is related to the fact that the acoustic emission behavior of a rigid heavy layer changes more than that of a flexible heavy layer.

The effect of the sound insulation layer directly behind the carpet layer relates exclusively to mass per unit area and flexibility. Setting the mass per unit area to 4.0 kg / m ² or more means that the German Patent Application Publication 2006
It is known from 741 specification, while on the other hand it is 2.0 kg / m ² according to West German Patent Application Publication No. 2809347. The sound-insulating heavy layer according to the invention has a minimum mass per unit area of 2.0 kg / m ² . However, it contains the effective carpet layer surface mass.

A suitable material for the layers 3, 4 having low or high flow resistance is foamed plastic, preferably flaked foamed plastic. However, variants are possible in which the flaked foam is replaced by a felt or similar textile material having similar acoustic properties. Any fiber or plastic filament fabric can be used in place of the carpet layer. When the above-mentioned different materials are appropriately designed in relation to the effective mass per unit area, the flexibility of the different materials is appropriate in terms of acoustic effect, and the properly designed mass allows the heavy layer to Alternatively, the normally required heavy layer can be omitted.

The present invention recognizes that layers of materials having different (low and high) flow resistances and by interchanging the layers can shift the resonant frequency and solve a number of acoustic problems in a novel way with a constant mounting depth. Based on.

In that case, the absolute values of the physical parameters of the individual layers can be varied within wide limits, the person skilled in the art being able to adapt them to the respective problem. As already mentioned, the individual layers may be of any chemical composition, so long as the principle according to the invention is realized.

In foamed plastics, foams with a high flow resistance, such as those with small pores and a relatively high density, are suitable. Foam with low flow resistance has a bulky structure and is lightweight.

A closed pore type foam is suitable as a foam having a high flow resistance, and an open pore type foam is suitable as a foam having a low flow resistance. In this case, the foams are of equal density, preferably 25 to 250 kg / m ³ , especially 25 to 70 k.
It can have a density of g / m ³ .

Rather, what is important is that there is a different flow resistance according to the invention.

For normal use, for example, the flow resistance of the high flow resistance layer should be at least 6 × 10 ⁶ Nsm ^-4 , preferably 6.9 × 10 ⁶ Nsm.
^-4 . On the other hand, the flow resistance of the low flow resistance layer is 5 to 200 × 10 ³ Nsm ^-4 , preferably 5 to 30 N × 10 ³ Nsm.
^-4 range, in particular 5.3 × 10 ³ Nsm ^-4 . That is, high flow resistance is about 100 to 1000 times higher than low flow resistance.

The manufacture of carpet members according to the present invention can be done in various ways. On the one hand, it is of course possible to bond the individual layers of the carpet element according to the invention by gluing.

It is of course also possible to bond only some individual layers of the laminated structure to each other, while bonding the other layers to one another, for example as described below.

In addition to gluing, the carpet member according to the present invention can also be manufactured by a back foaming process or other foamed plastic manufacturing method.

These methods are described in general in the claims, in which case it is pointed out that the individual methods can be combined with one another in almost any way.

When the carpet member according to the present invention is manufactured by a back foaming process in a closed mold, the soft, sound-insulating heavy layer below the carpet layer acts as a barrier to impede the penetration of the foam into the carpet layer. To do. Thus, the foamed plastic layer may be produced by foaming in a closed mold using a monolithic foam material, as is known, or prefabricated and back-foaming and / or adhering the molded parts stepwise. Thus, it can be manufactured in individual steps. For example, it has proved to be advantageous to use a semi-finished product consisting of a carpet layer followed by a heavy layer and optionally a foamed plastic layer with a higher flow resistance. Such a semi-finished product is put into a mold as described below, and a lightweight foam having a low flow resistance is subjected to back foaming treatment. The reverse method is also conceivable, in which the semi-finished product has a low flow resistance foam as the third layer instead of the high flow resistance foam, back foaming the type of foam which results in a high flow resistance foam. .

The foaming process may be carried out by inserting a semi-finished product consisting of a carpet layer followed by a heavy layer and optionally one of the foamed plastic layers into one of the open mold halves. On the other half mold, inject the foam on the entire surface of the half mold,
Cover the entire surface. It is preferable to use a heavy foam that foams for removal in this processing step. Wait for some initial reaction, then immediately pour the light foam mixture over the heavy foam in a separate machine. Again, the initial reaction is awaited, the mold is subsequently closed, and in the final reaction process the carpet layer, the heavy layer and the foams with different degrees of flow resistance are bonded together.

Another variant is to control the upper and lower mold halves differently and replace the conventional chemical blowing agent with urethane foam, e.g. water, with a low boiling physical blowing agent, e.g. methylene chloride (boiling point 40 To 42 ° C). Therefore, the lower half mold is heated to a temperature lower than the boiling point, in the above case about 20 to 25
C. and the upper half mold at 45 to 50.degree. C., ie above the boiling point. Since the boiling point has not been reached in the lower half, the methylene chloride remains in the liquid phase and only small pores are generated by the vapor escaping with a slight vapor pressure, resulting in a foam with a relatively high flow resistance.

On the other hand, in the upper half mold, the boiling point exceeds the boiling point due to heating of the half mold, so that methylene chloride is transferred to the vapor phase. This results in large pores, resulting in an overall low flow resistance foam structure. Closing the mold halves the two foams together. The carpet member according to the present invention can be formed as a molded product, but in that case, it can also be formed as a sheet member by the above method.

The inventive step of the construction of the carpet member according to the invention lies in the following points. That is, the resonance frequency can be adjusted by the elastic body layers such as laminated foam having different flow resistances even when the limit of the mounting depth and the weight limit for soundproofing are compulsorily specified by the automobile manufacturer. On the other hand, when a foam having the same physical and acoustic properties in the thickness direction of the entire elastic body is used, the resonance frequency cannot be adjusted.

Under an adjustable and variable resonance frequency, an economical solution that satisfies the acoustic requirements with a relatively small mounting space and mass per unit area, which is applicable to continuous manufacturing, is It is provided by an arrangement according to the invention.

[Brief description of drawings]

FIG. 1 is a sectional view of a carpet member having a mass-elasticity system tuned to a low range, in which a foamed plastic layer having a low flow resistance is in contact with an iron plate of a vehicle body as the lowermost layer of the carpet member.
FIG. 3 is a characteristic diagram showing the relationship between the frequency of sound attenuation and the frequency of the system shown in FIG. 1, and FIG. 3 is the process of sound attenuation of the system shown in FIG. It is a characteristic diagram which shows the relationship of a frequency. DESCRIPTION OF SYMBOLS 1 ... Carpet layer 2 ... Heavy layer 3 ... Elastic body (foamed plastic) layer with high flow resistance 4 ... Elastic body (foamed plastic) layer with low flow resistance 5 ... Iron plate of vehicle body

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Claims (31)

[Claims] 1. A carpet layer comprising: (a) a carpet layer, (b) a heavy layer disposed under the carpet layer, and (c) a plurality of layers having different flow resistances disposed under the heavy layer. A carpet member comprising the elastic layer of. 2. A combination of a plurality of elastic layers comprising two different foam plastic layers, one of which has a low flow resistance and the other of which has a high flow resistance. The carpet member according to claim 1. 3. In order to form a low-frequency tuned mass-elastic system with high sound insulation, the layer sequence is as follows: (a) carpet layer (b) heavy layer (c). ₁ ) Flow resistance of at least 6 × 10 ⁶ Nsm ^-4 , preferably 6.
9 × 10 ⁶ Nsm ^-4 foamed plastic layer (c ₂ ) with a flow resistance of 5 to 200 × 10 ³ Nsm ^-4 , preferably 5
^3. A carpet member according to claim 2, characterized in that the foamed plastic layer of 30 × 10 ³ Nsm ^-4 , especially 5.3 × 10 ³ Nsm ^-4 is selected in this order. 4. A mass tuned to a high range, which has a high sound insulation effect.
In order to form the elastic system, the sequence of layers is as follows: (a) carpet layer (b) heavy layer (c ₁ ) flow resistance of 5 to 200 × 10 ³ Nsm ^-4 , preferably 5
To 30 × 10 ³ Nsm ^-4 , in particular 5.3 × 10 ³ Nsm ^-4 foam plastic layer (c ₂ ) with a flow resistance of at least 6 × 10 ⁶ Nsm ^-4 , preferably 6.
The carpet member according to claim 2, wherein the foam plastic layer of 9 × 10 ⁶ Nsm ^-4 is selected in this order. 5. The sound-insulating heavy layer exhibits a minimum mass per unit area of 2.0 kg / m ^{2 including} the mass of the carpet layer surface. The carpet member according to any one of 4 above. 6. A plastic foam according to claim 1, characterized in that the foamed plastics with different flow resistance are flaky foams, which in some cases are deformed. Carpet material. 7. The carpet member according to any one of claims 1 to 6, wherein the carpet member is a molded product. 8. The carpet member according to any one of claims 1 to 7, wherein the carpet member is a sheet member. 9. A carpet layer comprising: (a) a carpet layer; (b) a heavy layer disposed under the carpet layer; and (c) a plurality of layers having different flow resistances disposed under the heavy layer. A method for producing a carpet member, comprising: a semi-finished product having the layers (a) and (b) is back-foamed in a closed mold; or The semi-finished product is placed on a one- or two-layer foam which has begun to react and has not yet cured,
A method for manufacturing a carpet member, comprising placing the layers (b) facing each other. 10. The combination of a plurality of elastic layers comprises two different foam plastic layers, one of which has a low flow resistance and the other of which has a high flow resistance. A method for manufacturing a carpet member according to claim 9. 11. In order to form a low-tuned mass-elastic system with high sound insulation, the layer sequence is as follows: (a) carpet layer (b) heavy layer (c). ₁ ) Flow resistance of at least 6 × 10 ⁶ Nsm ^-4 , preferably 6.
9 × 10 ⁶ Nsm ^-4 foamed plastic layer (c ₂ ) with a flow resistance of 5 to 200 × 10 ³ Nsm ^-4 , preferably 5
To 30 × 10 ³ Nsm ^-4 , especially 5.3 × 10 ³ Nsm ^-4 , in the order of foam plastic layer, and a semi-finished product with the layers (a) (b) and (c ₁ ) closed Patent, characterized in that it is back-foamed in or the semi-finished product is placed on the one- or two-layer foam which has begun to react and has not yet cured, facing said layer (c ₁ ). 11. The method for manufacturing a carpet member according to claim 10. 12. In order to form a high-tuned mass-elastic system with high sound insulation, the order of layers is as follows:
That is, (a) carpet layer (b) heavy layer (c ₁ ) flow resistance is 5 to 200 × 10 ³ Nsm ^-4 , preferably 5
To 30 × 10 ³ Nsm ^-4 , in particular 5.3 × 10 ³ Nsm ^-4 foam plastic layer (c ₂ ) with a flow resistance of at least 6 × 10 ⁶ Nsm ^-4 , preferably 6.
Selecting in the order of 9 × 10 ⁶ Nsm ^-4 foamed plastic layer and back-foaming the semi-finished product with said layers (a) (b) and (c ₁ ) in a closed mold, or A carpet according to claim 10, characterized in that the semi-finished product is placed on the one- or two-layer foam which has begun to react and has not yet cured, facing said layer (c ₁ ). A method of manufacturing a member. 13. The sound-insulating heavy layer exhibits a minimum mass per unit area of 2.0 kg / m ^{2 including} the mass of the carpet layer surface, as claimed in any one of claims 9 to 10. 12
Item 10. A method for manufacturing a carpet member according to any one of items. 14. A foam according to claim 9, characterized in that the foamed plastic with different flow resistance is a flaky foam, which in some cases is deformed. Manufacturing method of the carpet member. 15. The method for manufacturing a carpet member according to any one of claims 9 to 14, wherein the carpet member is a molded product. 16. The method for manufacturing a carpet material according to any one of claims 9 to 14, wherein the carpet member is a sheet material. 17. The foamed plastic layer is made of urethane foam, and the layers (c ₁ ) and (c ₂ ) are formed by continuously changing the mixing ratio of the polyol and the isocyanate during the back foaming treatment of the urethane foam. The method for manufacturing a carpet member according to any one of claims 11 to 16, wherein: 18. A layer is formed in an open mold by spraying a second foam onto the surface of the foam that has begun to react in the first layer. The method for manufacturing a carpet member according to any one of items 9 to 16. 19. The semifinished product is mounted on a two-layer foam which has not yet been cured.
Item 18. A method for manufacturing a carpet member according to any one of Items 1 to 16 or Item 18. 20. A physical foaming agent is used in the foaming treatment,
19. A two-layer foam is made by heating the upper and lower mold halves differently.
Item 21. A method for producing a carpet member according to Item 19 or Item 19. 21. The method for producing a carpet member according to claim 20, wherein a chemically uniform foam is used. 22. One half mold is thermostated below the boiling point of the physical blowing agent to form a high flow resistance layer, and the other half mold is formed to form a low flow resistance layer. 22. The method for producing a carpet member according to claim 20 or 21, characterized in that is heated to a temperature higher than the boiling point of the physical blowing agent used. 23. A methylene chloride is used as a physical blowing agent, wherein one half mold is temperature-controlled to 20 to 25 ° C. and the other half mold is heated to 45 to 50 ° C. 23. A method for manufacturing a carpet member according to claim 22. 24. (a) a carpet layer; (b) a heavy layer disposed under the carpet layer; (c) a plurality of layers disposed under the heavy layer and having different flow resistances. The method for producing a carpet member, characterized in that all or some of the layers (a), (b) and (c) are adhered to each other. 25. The combination of a plurality of elastic layers comprises two different foam plastic layers, one of which has a low flow resistance and the other of which has a high flow resistance. A method for manufacturing a carpet member according to Item 24. 26. To form a low-tuned mass-elastic system with high sound insulation, the layer sequence is as follows: (a) carpet layer (b) heavy layer (c). ₁ ) Flow resistance of at least 6 × 10 ⁶ Nsm ^-4 , preferably 6.
9 × 10 ⁶ Nsm ^-4 foamed plastic layer (c ₂ ) with a flow resistance of 5 to 200 × 10 ³ Nsm ^-4 , preferably 5
The method for producing a carpet member according to claim 25, characterized in that the foamed plastic layer of 30 × 10 ³ Nsm ^-4 , especially 5.3 × 10 ³ Nsm ^-4 is selected in this order. 27. To form a high-tuned mass-elastic system with high sound insulation, the order of layers is as follows:
(A) Carpet layer (b) Heavy layer (c ₁ ) Flow resistance of 5 to 20 × 10 ³ Nsm ^-4 , preferably 5 to 30 × 10 ³ Nsm ^-4 , especially 5.3 × 10 ³ Nsm ^-4 Foamed plastic layer (c ₂ ) having a flow resistance of at least 6 × 10 ⁶ Nsm ^-4 , preferably 6.
26. The method for manufacturing a carpet member according to claim 25, wherein the foamed plastic layer of 9 × 10 ⁶ Nsm ⁻⁴ is selected in this order. 28. The sound-insulating heavy layer exhibits a minimum mass per unit area of 2.0 kg / m ^{2 including} the mass of the carpet layer surface. 27
Item 10. A method for manufacturing a carpet member according to any one of items. 29. Claims 24 to 28, characterized in that the foamed plastics with different flow resistance are flaky foams, which in some cases are deformed.
Item 10. A method for manufacturing a carpet member according to any one of items. 30. The method for producing a carpet member according to any one of claims 24 to 29, wherein the carpet member is a molded product. 31. The method for manufacturing a carpet member according to any one of claims 24 to 29, wherein the carpet member is a sheet material.