DE2818252A1 - Motor vehicle body noise suppressing panel - has outer layers of different hardness and low bulk density laminated to inner layer of foamed plastics or felt - Google Patents

Abstract

Laminated noise suppressing panel is composed of two outer layers having different hardness and an intermediate layer which is soft and flexible, the layer which is softer being placed adjacent a wall which is to be protected. Used for motor vehicle bodies. Laminated panel has low bulk density and is capable of damping out surges of coincidence noise.

Description

multilayer soundproofing element consisting of preferably 2 cover

layers and a pliable intermediate layer.

the invention relates to a multilayer soundproofing element of preferably 2 cover layers and a pliable intermediate layer of this type Soundproofing elements are mainly used for acoustic isolation is Ag @ regete, to be placed on partition walls, without support as partition walls and as sound insulation mats used in various types of motor vehicles. The problem @ is, break-ins in the sound insulation curve z. @. to prevent caused by coincidence and with The smallest possible area ewicht to achieve high soundproofing values as possible above those of the comparison curve according to the so-called @ergerschem @esatz.

There are several multilayer soundproofing bodies from the patent literature known. For example, @. a resonance silencer, which is designed as a 3-layer mat is. Between 2 sheer layers, which preferably consist of sheet metal, a softer one is arranged between the layers.

The layers are glued here. This conception of a soundproofing element which is described in GM 7427551 mainly serves as a material - frame suspension to add energy to the sound field through absorption (through the production of resonances) to withdraw. The sound insulation is the same for these intended resonances heavy top layers naturally low, coincidence dips can occur with this Problem solving cannot be prevented.

It is also known, as described in the SM 7427551, a To realize sound-absorbing multilayer panel by "that one in the frequency range from 1U00 to 4u00 Hz in the Mitzel at least 30 /% sound-absorbing core layer Made of foam plastic for door stabilization on both sides with top layers friction-locked ig is connected and that at least one of the cover layers is the forwarding of the Incoming sound in the absorbing core layer is enabled to a sufficient extent. " An open-cell foam plastic z. @ Is preferably used as the core layer.

Polyurethane used. One of the top layers has openings (breakthroughs through which the incident noise is absorbed into the intermediate layer foam plastic can enter. The main effect of this bystem is again on the absorption sector. Due to the similar back layers, this must be used Multi-layer panels for sound insulation with resonance phenomena are expected consequently lead to coincidence drops.

E @ i @ @@ it rhin known from the literature the sound level in interior rooms to be reduced by soundproofing elements placed on the room delimitation walls. Here, the space delimitation areas are wholly or partially covered with sound-absorbing substances Damped hole and / or membrane resonator arrangements are lined in such a way that the @@ mpfun @ smittel this arrangement rests on the swinging turning parts. The @effect this @@@@@ protection system lies in the fact that the @ ch @ l field of the room passes through the beautiful hard top layer energy @ @@@@@@@@@@@@ l. @@ is @@ dech here rie @@@@@ that is to be reckoned with. that through the necessary res @@@@ zer @@@@@@@@@ en diere @ @@@@@ zur Schalld @@@ un @ cannot be b @@@ tzt.

E @ is @@@@ @@@@ known (AS @@@@ 871) a @@@ rschichtiger luftsch @ lld @ @@ ndes plat er element with skill sound @@ un @ from at least 2 by a @weiche @@ hwe @@ chicht flat interconnected layers made of bi @@@ rigid material @ie z. @. Rigios, @@@@@@ terial, wood-based materials, etc. The soundproofing effect this system is in the frequency ranges in which there are no rezona phenomena certainly occur well, as there is an intermediate layer with a low modulus of elasticity associated with low flexibility of the total @ lat @ e is available. However, it must certainly due to @er Rezonaz @@ appearances turn to coincidence breaks come, which in the sound insulation curve lead to breaks. The basis weight of this multilayer sound insulation system is also suitable for the application z. @. in motor vehicles too high.

The same princess is set out at the A @ 107332 @. Here is a Sound-absorbing partition for Kraftfahrz @@@ ge, especially between the engine and the passenger compartment described in which 2 arranged at a distance of a few on hard walls can be installed as a door system and the space in between is possible at night is filled with a sound absorbing material. The improvement of sound insulation is here mainly by sealing or blocking possible sound @@ ben @ e @ e achieved. However, since the 2 hard top layers have the same bending wave speed own, is right here with rezonanze @@ chappen, which leads to a reduction if not to completely cancel out the sound insulation effect in certain frequency ranges to lead.

There are also multi-layer sound-absorbing components from the literature known for soundproofing on Kfz Karos @rien, which e.g. from a Tep @ ich serving1 There are upper layers, connected to a plastic layer, including a dynamic one soft material which is again delimited over a large area by a plastic film. However, such mats can only be attached to the inside of the room. Furthermore In contrast to the present invention, the soft side is the Facing noise. Such systems (with what a cladding bowl) are already known from @autechnik. In addition, it is pointed out in the literature that because, 'with this system too, breaks in the sound insulation curve are expected got to.

As @ ez @ i @ t became, they are various multilayer soundproofing systems known to work mainly on the basis of absorption, too high a surface area @sitting and not being able to @@@@ rhinaus are able to @inds coincidence break-ins.

The present invention is based on the object described above Avoid disadvantages and in the multi-layer soundproofing element according to the invention low @@ surface weight with a sound insulation curve with no or very low coincidence drops connect to. The task he will f; Appropriately solved in that the cover layers (1,3) have different hardnesses and the softer top layer (3) when used of the system as a support part of the wall to be protected (16) is directly adjacent.

The sound insulation impressions to be suppressed are in the majority by Resonance phenomena and caused by standing waves. By using Different bending wave speeds are also within of the 2 top layers (1,3), so that resonance phenomena are hardly possible. In addition, through the first cover layer and the intermediate layer (2) eurch - Interfering noise from the soft rear wall to a much lesser extent than reflected from a hard back wall. @n connection with a porous, dynamic In addition, so-called standing waves are the soft intermediate layer are disturbing at medium frequencies and inclined sound incidence, largely attenuated.

In experiments it has been distributed @ erausgestallt. @ Ate the front one Top layer (1) has a hardness of approx. 80 - 90 ° Shore A.

In relation to this, the rear dechscicht (@) should have a hardness of approx. 60 ° Shore A. This combination offers the possibility of the greatest possible to combine mechanical rigidity with optimal sound insulation.

Due to the different weight per unit area of the 2 top layers, the Adaptation to special sound insulation cases can be made. This can be done by either different wall thickness (8.3) or different specific weight achieved will.

However, it is quite possible to use the same weight per unit area different bending stiffness to realize optimal sound insulation effects.

In a further embodiment of the invention the hard top layer is used made from a duromer. However, good soundproofing effects were also achieved with a metal foil achieved as a top layer.

A particularly effective embodiment of the invention is illustrated by 2 thermoplastic cover layers formed, which in a known manner with fillers, such as barite. It has been made to facilitate manufacturing developed as advantageous, the @ layers (1,2,3,) to be glued.

However, it can also be advantageous to apply a cover layer by foaming it on to connect with the intermediate layer (9) and then in the known ..eise with the time to glue the top layer.

It is also advantageous to use material with a specific Weight from 10 to 4u kr / m3 for the intermediate layer (2,4,7).

Specific weights from 5u to 90 kg / m3 can also be selected of the material for the intermediate layer can be used advantageously.

Excellent sound insulation results were achieved with intermediate layers made of open-cell polyurethane flexible foam with layer thicknesses of about 12 to 15 mm have been complied with.

If the multilayer soundproofing element according to the invention is mechanically is more stressed, it is advantageous in one of the cover layers (5) in places or work in inserts @ 6) over the entire surface. This can of course also be done in both Top layers happen.

Reduction of production costs was made easier through use a regenerated mat as an intermediate layer (4), preferably made of foam residues and / or heavy layer waste which has been foamed with polyurethane.

It can also be advantageous to use one as the intermediate layer (2) Use non-woven fabric.

about the laying of such heavy-layered noise protection elements To improve profiled surfaces, tension and / or pressure side can improve the surface on the radii to be formed (13.14 g) with notched slots, the one Enable manual deformation from the flat state without additional tools.

only to improve the sound insulation effect is it sometimes necessary to structure the surface of the cover layer (1). Because of the diffuse reflection the formation of standing waves in the itaum is reduced.

If the soundproofing elements are planned after production at the factory are to be deformed, it is advantageous to use them before the deformation process To heat infrared radiation or hot air.

They can, however, also be used as flat cuts, as there are with the great rigidity (sandwich effect) is possible, these soundproofing elements without additional stiffeners as a single soundproofing and / or partition use.

The factory deformation of the soundproofing elements is, see dependent claim 22 and 23, made in a vacuum mold (7u, 11). here, however, offers itself also the possibility of heating up via the vacuum mold.

Another advantageous embodiment of the soundproofing element is in that during the deformation process in the vacuum mold t 10,11) the edges in the same operation cut t 9) and the feedthroughs t 15) punched out will.

Various embodiments of the invention are shown in the drawings and are described in more detail below. They show: FIG. 1: Multilayer Soundproofing element in section.

Figure 2: Soundproofing element with a regenerated mat as an intermediate layer.

Figure 3: Top layer (5,6) with sinlsgen to increase the tensile strength.

Figure 4: Interlayer made of pressure-resistant material.

Figure 5: Top layers of different thickness.

Figure 6: vacuum form with punching device.

Figure 7: Soundproofing element with notch slots.

In Figure 1, the usual shape of the soundproofing element is shown, Consists of the sheer top layers (1.3 J and the flexible intermediate layer (2). The second cover layer t 3) is softer than the cover layer 1.

In the figure 2 it is shown how the soundproofing element with the softer one The top layer (3) is placed on the wall to be protected (e.g. body panel) soft intermediate layer t 4) is one here Regeneration mat taken preferably made of foam scraps and / or heavy layer cases with Foamed polyurethane was used.

In Figure 3, at least one of the back layers (5, 6) with a Insert. The inserts can be completely or only partially in one or Both of the back layers are attached depending on the type of load.

Figure 4 shows the intermediate layer (7) made of a pressure-resistant one elastic material.

In Figure 5 it is shown that the cover layers t 8.3) by different Material thickness come to differing weights per unit area.

FIG. 6 shows the soundproofing element k 1, 2, 3) in a vacuum form t 10.11). Here you have the option of cutting the walls via the cutting area (12) cut off the mat during the embossing process (9).

oll the multilayer soundproofing element according to the invention by hand can be molded onto the three-dimensional profiled surfaces to be protected Notches are provided on the pull and / or pressure side (13.14 g are.

The present multilayer soundproofing element according to the invention offers the optimum soundproofing effect with a low surface weight, with the measurement curve the sound insulation is hardly or not disturbed by coincidence break-ins.

L e r s e i t e

Claims (1)

SCHU @ ZAN @ PRÜCHE 1.) @ Enrschienti es Schallsenutzelenent consisting of ans preferably "top layers (1,4) and an @i @@@@@@@@@@ intermediate layer (@) This means that the cover layers (1, @) have under @@ ie @ @@ rte and the softer cover layer (3) At A @@ ending of the Beste @ as a support part d r to be protected wall (16) is directly adjacent. 2.) Mehrsch @ chliger Schallachutzelament according to Ans @ ruch 1 thereby geken @ z @ icknet, that one of the outer layers (1) has a hardness of 80 to 9u ° Shore A 3.) Multilayer Soundproofing element according to beginnings 1 and 2, characterized in that one of the cover layers (3) Has a hardness of approx. 60 ° Shore A. 4.) Multi-layer soundproofing element according to one or more of the Claims 1 to 3 characterized in that the soft cover layer (3) on the soundproof side. 5.) Multi-layer soundproofing element according to one or more of the Claims 1 to 4 characterized in that the cover layers (1,3) are different Steal cursed weight. This can be achieved through different wall thicknesses (8.3) or different s @ ezi -fisches weight can be achieved. 6.) Multi-layer soundproofing element according to one or more of the Arsorüche 1 to 5, characterized in that the top layers (1, @) gleienes Own areas @ ewi @@ t. 7.) Multi-layer soundproofing element according to one or more of the Claims 1 to 6, characterized in that the hard top layer (1) consists of a Duronerbes @@. 8.) Multi-layer soundproofing element after one or more rendering Claims 1 to 7, characterized in that the hard leak layer (1) from a metal foil. 9.) Multi-layer security element according to one or more of the Claims 1 to 6, characterized in that the two cover layers (1, @) as thermoblastic heavy layers and in well-known @@ i @ e with F @ l @ st @ ffen @ such as Schwers @ at are offset 10.) Multi-layer soundproofing element after a or more of Claims 1 to q, characterized in that the layers ( 1, 2, 3, are glued. 11.) Multi-layer soundproofing element according to one or more of the Claims 1 to 9, characterized in that a cover layer (e.g. 1) through View connected to the intermediate layer (2) and there @@ with the @ top layer (@) is glued. 12.) Multi-layer soundproofing element according to one or more of the Claims 1 to 11, characterized in that for the mixed layer (e.g. 2, 4, 7) preferably material with a specific weight of 10 - 4u kg / m is used will. 13.) Multi-layer soundproofing element according to one or more of the Claims 1 to 11, characterized in that for the intermediate layer k e.g. 2, 4, 7) preferably material with a: specific real of 50 - 9u kg / m) used will. 14.) Multi-layer soundproofing element according to one or more of the Claims 1 to 13, characterized in that the intermediate layer t 2) is made of open-pore Polyurethane-Weic @ foam. 15.) Educational acoustic protection element according to one or more of claims 1 to 14, characterized in that the intermediate layer (?) approx. 12-15 mm thick. 16.) Multi-layer soundproofing element according to one or more of claims 1 to 15, characterized in that the intermediate layer (7) from pressure-resistant but elastic material. 17.) Multi-layer soundproofing element according to one or more of the Claims 1 to 16, characterized in that in at least one cover layer ( 5) inserts t 6) are incorporated in places or over the entire surface. 18.) Multi-layer soundproofing element according to one or more of claims 1 to 17, characterized in that as an intermediate layer (4 g a Regenerated mat, preferably made from foam residues and / or heavy layer waste foamed with polyurethane. 19.) glehrschichtiges soundproofing element according to one or more of claims 1 to 17, characterized in that as an intermediate layer (2) a non-woven fabric is used. 20.) Multi-layer soundproofing element according to one or more of the Claims 1 to 19 characterized in that the surface on the tension and / or pressure side one of the stages to be molded (1 @, 14) is provided with notch slots Allow nand deformation from the planar state without tools. 21.) Multi-layer soundproofing element after one or more of the Claims 1 to 20, characterized in that the surface of at least one cover layer (1) is structured. 22.) Multi-layer soundproofing element after one or more of the Claims 1 to 21, characterized in that the necessary for better deformation Heating with @ els infrared lighting takes place. 23.) Multi-layer soundproofing element according to one or more of claims 1 to 21, characterized in that the necessary for better deformation Heating up with @ els hot air takes place. 24.) Multi-layer soundproofing element according to one or more of claims 1 to 2 @ characterized in that it is used as a flat cut will. 25.) Multi-layer soundproofing element according to one or more of claims 1 to 24, characterized in that it due to its great rigidity is used as a soundproofing or partition wall without additional stiffeners. 26.) Multi-layer soundproofing element after one or more of the Claims 1 to 25 characterized in that the deformation after heating corresponds to @ the dependent claims 22 or 23 is made in a vacuum mold (1u, 11). 27.) Multi-layer soundproofing element after one or more of the Claims 1 to 2.6 characterized, dhß the heating in the vacuum mold t 10, 11). 28.) Multi-layer soundproofing element after one or more of the Claims 1 to 27, characterized in that during the deformation in the vacuum mold (10, 11) the edges are trimmed (9) and bushings t t5) are punched out.