DE102022000440A1 - Process for producing a soundproofing mat for a motor vehicle - Google Patents

Abstract

The invention relates to a method for producing a soundproofing mat (10) for a motor vehicle comprising at least one fleece (12), in which fibers (16) recycled from a tire of a motor vehicle are laid down and aligned in the airlaid process (14) and then recycled fibers (16) different, second fibers (18) the fleece (12) is formed.

Description

The invention relates to a method for producing a soundproofing mat for a motor vehicle that comprises at least one fleece.

the DE 10 2013 221 352 A1 discloses a soundproofing element comprising a first and a second carrier layer and a soundproofing layer with rubber granulate arranged between the first and the second carrier layer, preferably made from old tires.

Furthermore, from the EP 2 338 928 A1 a binding fiber for strengthening flat materials containing natural fibers can be seen as known, the binding fiber comprising a copolyamide as at least a first thermoplastic component.

The object of the present invention is to create a method for producing a soundproofing mat for a motor vehicle, in which the soundproofing mat can be produced in a particularly environmentally friendly manner.

This object is achieved according to the invention by a method for producing a soundproofing mat for a motor vehicle, comprising at least one fleece, with the features of patent claim 1 . Advantageous configurations with expedient developments of the invention are specified in the remaining claims.

The invention relates to a method for producing a soundproofing mat for a motor vehicle comprising at least one fleece, in particular at least one fleece mat. The motor vehicle is preferably designed as a motor vehicle, in particular as a passenger car, commercial vehicle or truck.

The soundproofing mat can be referred to in particular as an absorption mat, noise absorber mat or as an absorber fleece, in particular a noise-reducing one. In its installed position in the motor vehicle, the soundproofing mat has a sound-reducing or noise-reducing effect, in particular for an occupant of the motor vehicle. This means that, for example, a noise from the motor vehicle can be perceived by the occupant in a vehicle interior of the motor vehicle because the motor vehicle has the sound insulation mat, i.e. with a lower sound intensity or lower volume, than if the motor vehicle does not have the sound insulation mat has and is therefore free of the sound insulation mat. Thus, the soundproofing mat can be understood to mean, in particular, insulating or damping material of the motor vehicle.

The noise of the motor vehicle can be understood in particular as a noise caused by the motor vehicle, in particular when the motor vehicle is driving. The noise of the motor vehicle is, for example, a driving noise, in particular a tire rolling noise, wind noise or an engine noise of the motor vehicle.

For example, the soundproofing mat is designed as a soundproofing mat for an underbody, in particular an underbody paneling, for a wheel arch, in particular a wheel arch paneling, or for an energy store, in particular for an energy store cover, of the motor vehicle or for the motor vehicle. The energy storage cover can be understood in particular as a storage housing or a housing part of the energy storage. The energy store is preferably an electrical energy store, in particular a battery.

In order to be able to produce the soundproofing mat in a particularly environmentally friendly or resource-saving manner, it is provided that recycled fibers from a motor vehicle tire are laid down and aligned in the airlaid process and the fleece is then formed using second fibers that are different from the recycled fibers. In other words, in the airlaid method, recycled fibers from a tire of a motor vehicle are laid down and aligned, and the fleece is then formed using the recycled fibers and the second fibers. In other words, fibers recycled from the tire are separated by means of the airlaid method, with the fleece, in particular the fleece mat, then being formed or produced from the separated fibers and the second fibers. This means that the soundproofing mat, in particular the fleece, comprises the recycled fibers and the second fibres. The fleece is thus produced from the recycled fibers and the second fibers, with the sound insulation mat being formed or produced from the fleece.

The recycled fibers are preferably textile fibers. The recycled fibers can be referred to in particular as recycled fibers. The second fibers are preferably designed as binding fibers.

The tires are preferably old tires. This means that the recycled fibers are obtained from the scrap tire or from several scrap tires, respectively be won. Thus, in the process, fibers from old tire recycling are used to produce the fleece, in particular the soundproofing mat. The recycled fibers are processed into the fleece, in particular the fleece mat, using the airlaid process.

The respective old tire can in particular be understood to mean a sorted out tire. This means that the used tire has been used in its originally intended use in a motor vehicle. The used tire is therefore in particular a waste product.

The fact that the recycled fibers are laid down and aligned in the airlaid process can be understood to mean in particular that the laying down and the alignment are carried out at least partially using the airlaid process. This means that, for example, in addition to the airlaid process, at least one further process, in particular different from the airlaid process, can be carried out in order to lay down or align the recycled fibers.

The invention is based in particular on the following findings and considerations: It is expected that the consumption of resources and a lack of, in particular high-quality, reuse of materials or raw materials can be central issues of the future, in particular to be solved. A particularly large number of used tires are currently being produced, particularly worldwide. This can, for example, be 20 million tons of scrap tires generated worldwide every year. A trend can be seen here as increasing, which means that the scrap tires produced will probably increase annually. In Germany, for example, 600,000 tons of old tires accumulate every year. Thus, particularly high-quality recycling of waste products present after recycling the used tires can be particularly important. When recycling old tires, for example, 75 percent of the old tires can be used to produce rubber, for example for tartan tracks or road construction. With recycling, for example, 15 percent of the end-of-life tires can be used to make steel, especially for the steel industry. When it comes to recycling, the remaining 10 percent of the used tire can be the recycled fibre, in particular the textile fibre, for which no further processing can usually be provided up to now. This means that no meaningful further use is usually planned or carried out for the recycled fiber. That is, the recycled fiber can only be provided as a waste product so far.

In a conventional method for producing a conventional soundproofing mat, it can usually be provided to use predominantly new, petroleum-based fibers. This means that the conventional soundproofing mat or the conventional absorber are made, for example, predominantly from synthetic fibers, in particular virgin synthetic fibers. As a result, with the conventional method or with the conventional sound insulation mat, an environmental balance and thus, for example, a life cycle analysis or life cycle assessment (LCA) can be particularly bad. As a result, it is practically impossible to achieve CO ₂ neutrality (zero emissions) with the conventional process.

In contrast, the fibers recycled from used tires are utilized in the method according to the invention. The fibers resulting from the recycling of used tires as a waste product can be reused. In particular, a cycle can be closed because a new product for a motor vehicle, namely the sound insulation mat, can be produced from a waste product of a motor vehicle, namely the tire or the used tire. This means that waste materials can be integrated into the production of the soundproofing mat in the method according to the invention. As a result, for example, CO ₂ emissions can be particularly reduced or kept particularly low during production of the soundproofing mat. Furthermore, resource conservation can be achieved, that is to say the soundproofing mat can be produced in a particularly resource-conserving or sustainable manner using the method according to the invention. When producing the soundproofing mat using the method according to the invention, CO ₂ emissions can be lower, in particular significantly lower, than with a conventional method. For example, with the conventional method, a CO ₂ equivalent (CO ₂ E) can be around 0.6 kilograms per square meter of the soundproofing mat, whereas with the conventional method the CO ₂ equivalent can be 1.9 kilograms per square meter of the soundproofing mat. This means that a CO ₂ footprint with the method according to the invention can be reduced to a quarter of a CO ₂ footprint of the conventional method, for example. The absorption properties or soundproofing properties and technical performance of the soundproofing mat produced using the method according to the invention can be at least as good as with a soundproofing mat produced using the conventional method. This can in particular be understood to mean that the sound produced by means of the method according to the invention insulation mat is at least technically adequate to the sound insulation mat produced using the conventional method. This means that the soundproofing mat produced using the method according to the invention can be of particularly high quality. Thus, despite the use of a recycled raw material, namely the recycled fibers, a constant technical functionality can be achieved.

The cycle can be understood in particular as an, in particular internal, cycle economy. This means that a new material for new components with a particularly high proportion of recycling in the form of the soundproofing mat can be produced from the previous waste product in the form of old motor vehicle tires, which means that a particularly positive ecological balance can be achieved. The textile fibers from the recycling of used tires are reused to produce the soundproofing mat. The use of new, petroleum-based raw materials is avoided, resulting in a particularly sustainable material cycle.

Furthermore, with the method according to the invention, costs, in particular production costs for producing the soundproofing mat, can be kept particularly low. For example, the production costs for the method according to the invention can be only one-fifth of the production costs for the conventional method. The soundproofing mat can thus be produced in a particularly cost-effective manner using the method according to the invention.

In particular, because the recycled fibers are a waste product, competition for land, as is the case with some renewable raw materials, can be avoided. This means that in particular there is no "tank or plate issue". Furthermore, as a result of the particularly high number of old tires occurring annually, there are particularly high quantities of recycled fibers for producing the soundproofing mat using the method according to the invention. The method according to the invention can thus be used to produce soundproofing mats in particularly large or sufficient quantities.

The recycled fibers may be too short for a conventional method of making a conventional soundproofing mat, such as mechanical needling. This can be avoided by means of the method according to the invention, in particular by the airlaid method. Thus, by means of the method according to the invention, short or particularly short recycling fibers can be processed into the fleece or the soundproofing mat.

In the method according to the invention, preferably mechanical needling, in particular, is not required, ie needling, in particular mechanical needling, is not carried out in the method according to the invention.

Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawings. The features and combinations of features mentioned above in the description and the features and combinations of features mentioned below in the description of the figures and/or shown alone in the figures can be used not only in the combination specified in each case, but also in other combinations or on their own, without going beyond the scope of the leave invention.

• 1 eine schematische Teilschnittansicht einer Schalldämmmatte, welche mittels eines erfindungsgemäßen Verfahrens herstellbar ist; und
• 2 ein schematisches Verfahrensdiagramm eines erfindungsgemäßen Verfahrens; und
• 3 eine schematische Teilschnittansicht einer Schalldämmmatte zum Veranschaulichen eines erfindungsgemäßen Verfahrens.

show:

• 1 a schematic partial sectional view of a soundproofing mat, which can be produced by means of a method according to the invention; and
• 2 a schematic process diagram of a method according to the invention; and
• 3 a schematic partial sectional view of a sound insulation mat to illustrate a method according to the invention.

Elements that are the same or have the same function are provided with the same reference symbols in the figures.

1 shows a soundproofing mat 10 for a motor vehicle in a schematic partial sectional view, wherein the soundproofing mat 10 comprises at least one fleece 12 . The fleece 12 is preferably designed as a fleece mat.

The soundproofing mat 10 is intended in particular to particularly reduce a noise from the motor vehicle and/or from the surroundings of the motor vehicle that can be perceived by an occupant in the motor vehicle. As a result, for example, comfort, in particular driving comfort, of the motor vehicle can be particularly increased.

2 shows a schematic process diagram for producing the fleece 12 or the sound insulation mat 10. In the process, in the airlaid process 14, which is referred to in particular as the airlaid process, recycled fibers 16 from at least one tire, in particular old tires, of a motor vehicle are laid down and discharged directs. The recycled fibers 16 are preferably textile fibers. In particular, the airlaid process 14 can be used to form or shape the fleece 12 .

The fibers 16 can thus be obtained or formed during a separation process as part of a used tire recycling process. The separation process can be part of the method or the separation process can be performed separately from the method.

In the airlaid process 14, the recycled fibers 16 are preferably acted upon by an air flow and are thereby deposited or separated by the air flow. For example, the air flow is a hot air flow. Thus, in the airlaid process 14, the recycled fibers 16 can be deposited or separated with the supply of heat. For example, the air flow is compressed air, which has a pressure of seven bar, for example. The recycled fiber 16 can, for example, be particularly strengthened by the air flow.

The fleece 12 is then formed from the recycled fibers 16 laid down in the airlaid process and from the second fibers 18 that are different from the recycled fibers 16 . The fleece 12 is thus formed or produced by means of the recycled fibers 16 and the second fibers 18 . This means that the mat 12 includes the recycled fibers 16 and the second fibers 18 . The formation of the fleece 12 from the recycled fibers 16 and the second fibers 18 can in particular be referred to as connecting 20 or as bonding.

Due to the fact that the recycled fibers 16 are fibers 16 recycled from the respective tire or old tire, the fleece 12 and thus the sound insulation mat 10 can be produced in a particularly sustainable manner. As a result, for example, CO ₂ emissions occurring during the production of the fleece 12 or the soundproofing mat 10 can be kept particularly low. Furthermore, a material cycle can be achieved in which a new component for a motor vehicle, namely the sound insulation mat 10, can be produced from a component of a motor vehicle, namely the tire or old tire.

For example, a proportion of the recycled fibers 16 in the fleece 12 or the soundproofing mat 10 can be at least 80 percent, in particular between 80 and 90 percent. This means that a proportion of the second fibers 18 in the fleece 12 can be, for example, at most 20 percent, in particular between 10 and 20 percent. Provision is preferably made for the fleece 12 to consist exclusively of the recycled fibers 16 and the second fibers 18 . The second fibers 18 cannot be recycled fibers.

After the connection 20, the fleece 12 can be wound and/or packaged, for example. Winding 22 can in particular be understood to mean that the fleece 12 is rolled up on a roll. As a result, the fleece 12 can be transported in a particularly advantageous manner and, for example, brought to a location at which the sound insulation mat 10 is produced from the fleece 12 .

Provision is preferably made for two layers 24, 26 to be formed from the fleece 12, which are arranged and connected to one another, in particular directly, on one another, in particular one above the other, in order to form or produce the sound insulation mat 10. In other words, two nonwovens 12, in particular nonwoven mats, referred to in particular as individual nonwovens, are formed by doubling to form the soundproofing mat 10. Duplication can in particular be understood to mean duplication. this is in 3 shown, in which the layers 24, 26 are shown in a schematic partial sectional view when applied to each other to form the sound insulation mat 10. This means that the fully manufactured soundproofing mat 10 has the layers 24 , 26 . The sound insulation mat 10 can thus comprise two fleece mats formed from the fleece 12 . A first of the layers 24 formed from the fleece 12 can be referred to as the first fleece mat and the second of the layers 26 formed from the fleece 12 can be referred to as the second fleece mat. By arranging the two layers 24, 26 next to one another, a thickness of the soundproofing mat 10 can be specifically adjusted, for example. As a result, for example, an absorption capacity or sound insulation capacity of the sound insulation mat 10 can be adjusted in a targeted manner.

As in 3 shown, provision can be made, for example, for the second layer 26 to be arranged gradually or stepwise on or on the first layer 24 . Alternatively, provision can be made for the second layer 26 to be arranged areally on or on the first layer 24 in, in particular precisely, a single step.

Provision is preferably made for the layers 24, 26 to be cut to size before they are arranged on one another. This means that from the fleece 12, the respective layer 24, 26, in particular of which the first and the second non-woven mat, is formed by cutting. The fleece 12 is thus cut to size, the layers 24, 26 resulting from the cutting.

In a further embodiment, it is provided that the layers 24 , 26 , in particular the recycled fibers 16 , comprise rubber particles 28 . As a result, particularly good sound absorption properties or soundproofing properties of the respective layer 24, 26 and thus of the soundproofing mat 10 can be brought about. As a result, the noise perceptible to the occupants can be kept particularly low. As a result, the comfort of the motor vehicle can be particularly increased.

Due to the fact that the sound absorption properties or the sound damping properties can be particularly increased, the thickness of the soundproofing mat 10 can be kept particularly small, for example. As a result, for example, the weight of the soundproofing mat 10 can be kept particularly low.

Due to the rubber particles 28, an absorption coefficient, in particular a frequency-dependent one, of the sound insulation mat 10, in particular in a third-octave center frequency between 400 and 10,000 Hertz, in particular 6,300 or 8,000 Hertz, can be higher than in the case of a conventional sound insulation mat 10 produced using a conventional method.

The rubber particles 28 are preferably rubber particles of the tire or old tire. This means that the rubber particles 28 contained in the layers 24, 26 or the recycled fiber 16 result from the recycling of the tire or old tire. A proportion of the rubber particles 28 in the recycled fibers 16 can be up to 30 percent or up to 40 percent, for example.

• Die erste Schicht 24 weist eine erste Seite 30 auf und die zweite Schicht 26 weist eine zweite Seite 32 auf. Die Gummipartikel 28 sind zumindest überwiegend auf der jeweiligen Seite 30, 32 angeordnet. Dies bedeutet, dass sich die Gummipartikel 28 in der jeweiligen Schicht 24, 26 vermehrt auf der jeweiligen Seite 30, 32 befinden. Das heißt, dass sich auf einer von der ersten Seite 30 unterschiedlichen, insbesondere der ersten Seite 30 gegenüberliegenden, dritten Seite 34 der ersten Schicht 24 weniger Gummipartikel 28 befinden als auf der ersten Seite 30. Somit befinden sich auf einer von der zweiten Seite 32 unterschiedlichen, insbesondere von der zweiten Seite 32 gegenüberliegenden, vierten Seite 36 der zweiten Schicht 26 weniger Gummipartikel 28 als auf der zweiten Seite 32. Die Schichten 24, 26, insbesondere die Seiten 30, 32, werden derart aneinander angeordnet, dass die jeweiligen Seiten 30, 32 einander zugewandt sind und die jeweiligen Seiten 34, 36 einander abgewandt sind. Dies bedeutet, dass in vollständig hergestelltem Zustand der Schalldämmmatte 10 die Seiten 30, 32 mittig in der Schalldämmmatte 10 angeordnet sind, wobei die Seiten 34, 36 vorzugsweise außenseitig angeordnet sind. Somit befinden sich in vollständig hergestelltem Zustand der Schalldämmmatte 10 die Gummipartikel 28 zumindest überwiegend, insbesondere vollständig, mittig in der Schalldämmmatte 10. Die Seiten 30, 32 beziehungsweise die Gummipartikel 28 sind somit vorzugsweise mittig in der Schalldämmmatte 10 angeordnet. Dadurch können die Gummipartikel 28, insbesondere mittig, in der Schalldämmmatte 10 eingeschlossen werden. Dadurch kann ein Ausfallen von etwaigen, nicht gebundenen Gummipartikeln 28 vermieden werden. Dies bedeutet, dass sich durch die Doppelung der Schichten 24, 26 beziehungsweise der Vliesmatten die Gummipartikel 28 nicht aus der Schalldämmmatte 10 herauslösen können, sondern vorzugsweise in der Schalldämmmatte 10 haften. Mit anderen Worten ausgedrückt kann es durch das Dublieren der Schichten 24, 26 beziehungsweise der Vliesmatten gelingen, lose beziehungsweise leicht lösbare Gummipartikel 28 in der Mitte der Schalldämmmatte 10 einzuschließen. Dadurch kann die Schalldämmmatte 10 besonders robust beziehungsweise ausfallsicher sein, wodurch beispielweise eine besonders hohe Einsatzfähigkeit der Schalldämmmatte 10 erzielt werden kann.

Provision is preferably made for the rubber particles 28 in the respective layer 24, 26 to be arranged at least predominantly, in particular completely, on a respective side 30, 32 of the respective layer 24, 26, with the layers 24, 26 being attached to one another, in particular directly, in this way , In particular one above the other, are arranged that the respective sides 30, 32, in particular in the fully manufactured state of the sound insulation mat 10, face each other. This can be understood to mean the following in particular:

• The first layer 24 has a first side 30 and the second layer 26 has a second side 32 . The rubber particles 28 are at least predominantly arranged on the respective side 30, 32. This means that the rubber particles 28 in the respective layer 24, 26 are increasingly located on the respective side 30, 32. This means that there are fewer rubber particles 28 on a third side 34 of the first layer 24 which is different from the first side 30 , in particular opposite the first side 30 , than on the first side 30 , in particular from the second side 32 opposite, fourth side 36 of the second layer 26 fewer rubber particles 28 than on the second side 32. The layers 24, 26, in particular the sides 30, 32, are arranged on one another in such a way that the respective sides 30, 32 face each other and the respective sides 34, 36 face away from each other. This means that when the soundproofing mat 10 is completely manufactured, the sides 30, 32 are arranged centrally in the soundproofing mat 10, with the sides 34, 36 preferably being arranged on the outside. Thus, when the soundproofing mat 10 is fully manufactured, the rubber particles 28 are at least predominantly, in particular completely, in the middle of the soundproofing mat 10. The sides 30, 32 or the rubber particles 28 are thus preferably arranged in the middle of the soundproofing mat 10. As a result, the rubber particles 28 can be enclosed in the soundproofing mat 10, in particular in the middle. As a result, any non-bound rubber particles 28 can be prevented from falling out. This means that due to the doubling of the layers 24 , 26 or the fleece mats, the rubber particles 28 cannot detach from the soundproofing mat 10 , but preferentially adhere to the soundproofing mat 10 . In other words, by doubling the layers 24 , 26 or the fleece mats, it is possible to enclose loose or easily detachable rubber particles 28 in the middle of the soundproofing mat 10 . As a result, the soundproofing mat 10 can be particularly robust or failsafe, as a result of which, for example, a particularly high degree of usability of the soundproofing mat 10 can be achieved.

The rubber particles 28 are preferably arranged at least predominantly on the respective side 30, 32 in the respective layer as a result of the recycling of the used tires, that is to say as a result of the recycling process. For example, during the recycling process, the rubber particles 28 can accumulate on the respective lower side 30, 32 of the respective fleece mats, since the rubber particles 28 can be particularly heavy, in particular compared to the fibers 16. This means that rubber parts can process accumulate conditionally increased on the respective page 30, 32.

In a further embodiment, it is provided that the recycled fibers 16 are comminuted before the fleece 12 or the respective layer 24, 26 is formed. In particular, this can be referred to as defibration 38 . This means that the recycled fibers 16 can first be comminuted, with the comminuted fibers 16 then being laid down and aligned, in particular separated, by means of the airlaid method 14 . Thus, the batt 12 can be formed from the chopped recycled fibers 16 and the second fibers 18 . The defibration 38 can in particular be referred to as “fiber opening and dosing”.

Provision is preferably made for a respective binding fiber 40 to be used as the second fibers 16 . In other words, the second fibers 18 are designed as binding fibers 40 . The binding fiber 40 can be provided in particular to strengthen the recycled fibers 16 or the fleece 12 . Provision is preferably made for the binding fiber 40 to be bonded to the recycled fiber 16 to form the fleece 12 with the supply of heat 41 . This can in particular be referred to as thermal bonding. As a result, the second fibers 18 and the recycled fibers 16 can be connected to one another particularly firmly or particularly securely.

It is preferably provided that two-component fibers 42 are used as the second fibers 16 . This means that the second fibers 18, in particular the binding fibers 40, are designed as two-component fibers 42. As a result, mechanical properties of the fleece 12 and thus of the soundproofing mat 10 can be particularly improved. Furthermore, the recycled fibers 16 and the second fibers 18 can be connected to one another particularly firmly or securely.

The two-component fiber can be understood in particular to mean that the two-component fiber comprises a first fiber component and a second fiber component that is different from the first fiber component. It can be provided that the two-component fiber 42 consists only of the two fiber components. Preferably, the first fiber component is formed from a first material and the second fiber component is formed from a second material different from the first material.

For example, a respective proportion of the respective fiber component in the two-component fiber 42 can be 50 percent. For example, the first fiber component is polypropylene (PP). For example, the second fiber component is polyethylene (PE). Alternatively, the first fiber component can be polyethylene terephthalate (PET), for example. Alternatively, the first fiber component can be polyactide (PLA), for example. Alternatively, the second fiber component can be, for example, poly(ethylene succinate) (PBS).

As an alternative or in addition to the airlaid process 14, at least one further process, such as carding, unwinding, spunlacing or drying, can be provided. As an alternative to the airlaid method 14, a method referred to as a wetlaid method can be carried out, for example. In the wetlaid process, water consumption can be particularly increased compared to the airlaid process 14, as a result of which the airlaid process 14 can be used to produce the soundproofing mat 10 in a more sustainable or environmentally friendly manner than the wetlaid process. Furthermore, the wetlaid method may not be suitable for particularly thin layers. In particular, energy costs can be particularly high in the wetlaid process, in particular higher than in the airlaid process 14.

Preferably, no film is used or used in the airlaid process 14 . This means that preferably no film is used within the process for producing the soundproofing mat 10, ie the production of the soundproofing mat 10 is thus free of the film. As a result, the soundproofing mat 10 can be produced particularly easily, in particular compared to a conventional method in which a film is used in the airlaid method 14 . Furthermore, the soundproofing mat 10 can be produced in a particularly sustainable manner, in particular because the film can be dispensed with. For example, it can be provided in the method that the recycled fibers in the airlaid method are laid down on a belt, in particular directly on the belt, in particular instead of on a film.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102013221352 A1 [0002]
• EP 2338928 A1 [0003]

Claims (7)

Method for producing a soundproofing mat (10) for a motor vehicle comprising at least one fleece (12), in which recycled fibers (16) from a tire of a motor vehicle are laid down and aligned in the airlaid method (14) and then using the recycled fibers (16 ) Different, second fibers (18) the fleece (12) is formed. procedure after claim 1 , characterized in that two layers (24, 26) are formed from the fleece (12), which are arranged on one another and connected to one another to form the soundproofing mat (10). procedure after claim 2 characterized in that the layers (24, 26) comprise rubber particles (28). procedure after claim 3 , characterized in that the rubber particles (28) in the respective layer (24, 26) are arranged at least predominantly on a respective side (30, 32) of the respective layer (24, 26), the layers (24, 26) being such are placed next to each other so that the respective sides (30, 32) face each other. A method according to any one of the preceding claims, characterized in that the recycled fibers (16) are chopped up prior to forming the batt (12). Method according to one of the preceding claims, characterized in that a respective binding fiber (40) is used as the second fibers (18), which is bonded to the recycled fibers (16) to form the fleece (12) with supply of heat (41). Method according to one of the preceding claims, characterized in that two-component fibers (42) are used as the second fibers (18).

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