CN1764941B - Ultralight soundproof material - Google Patents

Abstract

A sound insulator of the invention includes a sound absorption layer 202 and an air-impermeable resonance layer 203, which are bonded to each other via an adhesive layer 204. The sound absorption layer 202 has a thickness in a range of 5 to 50 mm and an area-weight of not greater than 2000 g/m<2>. The sound absorption layer 202 has a two-layer structure of a high-density sound absorption layer 202a and a low-density sound absorption layer 202b, which have different densities. The high-density sound absorption layer 202a is bonded to the air-impermeable resonance layer 203 via the adhesive layer 204 and has a density in a range of 0.05 to 0.20 g/cm<3> and a thickness in a range of 2 to 30 mm. The low-density sound absorption layer 202b is bonded to the other face of the high-density sound absorption layer 202a, which is opposite to the air-impermeable resonance layer 203, via an adhesive layer 202c and has a density in a range of 0.01 to 0.10 g/cm<3> and a thickness in a range of 2 to 30 mm. The structure of this sound insulator effectively reduces a noise level in a voice-tone frequency band, especially in a high frequency domain, thereby efficiently enhancing the clarity of conversion in a vehicle interior.

Description

The sound-proof material of ultralight amount

Technical field

The noise that the present invention relates to prevent the engine chamber etc. in the non-compartment case passes to employed Ultralight sound insulator in the compartment, relates in particular to light in structure, can absorb the Ultralight sound insulator that passes to the noise in the compartment.

Background technology

Shown in patent documentation 1 (special table 2000-516175), on vehicle, can bring and reduce noise and effect of heat insulation, especially on floor sound insulation and the wall sound insulation of edge part compartment and door closure and inboard, roof, be provided with multi-functional external member (41), this external member is to have sound absorption properties, sound insulation and vibrations to subtract the heat insulation cover of declining property, and has at least one planar body parts (11), multilayer reduction noise assembly packaging (package) (42); In aforesaid assembly packaging, have 1 porose (porous) spring layer (13) at least, particularly have the foaming layer of open hole (bore); Between aforesaid assembly packaging (42) and aforementioned planar body parts, be provided with an air layer (25).Because the sound insulation, sound absorption properties and the shock attenuation that see through formed ultralight amount external member (41) and be with optimal proportion constitute, therefore aforesaid multiple layer combination packing (42) is a combination set that does not have the weight layer, the hard layer (14) that has micro pores particularly has the fibrage or the fiber/composite foam layer of open bore; Aforementioned hard (14) has Rt=500Nsm ^-3～Rt=2500Nsm ^-3The drag overall of air-flow is especially to Rt=900Nsm ^-3～Rt=2000Nsm ^-3Air-flow have drag overall, and have mF=0.3kg/m ²～mF=2.0kg/m ²Weight per unit area, particularly have mF=0.5kg/m ²～mF=1.6kg/m ²The external member of weight per unit area characteristic.The characteristics of the present invention external member are liked the slim iron plate that uses and the aluminium flake of light weight running into today automobile industry, and during organic thin slice, particular significant effect.The advantage of this invention external member is that the heat conduction degree of employed porose spring layer is extremely low, so this external member also has good thermal insulation when possessing good acoustic characteristic (particularly soundproof effect).

Shown in patent documentation 2 (spy opens 2001-347899), for motor vehicle sound-proof material 10 is by the 1st aeration sound absorbing layer 20 from 100 in regular turn in the compartment, non-aeration pugging 30, the 2nd aeration sound absorbing layer 40 laminations form, and the 1st aeration sound absorbing layer 20 does not have non-unsaturated zone in the inboard, compartment, the inboard, anti-compartment of the 2nd aeration sound absorbing layer 40 does not have non-unsaturated zone yet, this feature allows noise by sound-proof material the time, leak into gas-bearing formation, this feature allows noise by sound-proof material the time, the noise that leaks in the compartment can be absorbed once again, and provide an acoustic construction that the noise that passes to outside engine chamber in the compartment can be absorbed, also provide one to take into account light-weighted sound-proof material simultaneously.

Shown in patent documentation 3 (spy opens 2002-220009), the automobile that on the indoor surface of body panel (panel) (10), is installed additional Insulator (20), this Insulator (20) is made of the sound absorbing layer (21) of individual layer based on the fibre forming body, can absorb and penetrate the noise that body panels (10) is invaded sound absorbing layer (21), and penetrate penetrating of sound absorbing layer (21) and revert to sound absorbing layer (21) through face side once again after noise can the plank (40) in the compartment reflects, therefore the feature of this insulator is a kind of ventilation type Insulator that can absorb this reflection noise, has at least the one side employing to form than epidermal area (22) the institute lamination that the higher high-density fiber aggregate of density of sound absorbing layer (21) face is constituted on the table the inside of sound absorbing layer (21).Have at least in the middle of the table the inside of this external sound absorbing layer (21) on simultaneously whole or the part face, epidermal area (27) lamination that adopts Foamex cloth material to be constituted forms.Just must not use pugging in the past thus, and the energy weight reduction can reduce the rising of sound press in the installation panel 40 simultaneously, improves the quiet degree in the compartment.

Shown in patent document 4 (spy opens 2002-347194), the lamination product be by the epidermis peel strength below 20N/cm, the L value is at the Foamex of the polyene below 60 (Polyolefin) class, with thickness more than 5mm, density 50kg cm ³The following integrally formed laminate of bulkiness adhesive-bonded fabric, this layer body is characterised in that per unit area weight is at 3kg/m ²Below.Can provide a kind of in light weight and recovery property is good, the lamination product of shaping handling ease and beautiful appearance thus.

Summary of the invention

Utilizing the epidermal area of aeration resistance and the quiet material of instrument panel of sound absorbing layer be combined into also is one of motion.

One, the problem of Xie Jueing:

The structure of traditional acoustic construction and patent documentation 1 and transmission loss and sound absorbing power are compared, and its result is as follows.The low frequency number here mainly is meant the cycle of 1/3 octave band (octave band) below 315Hz, and middle cycle is meant 400～1600Hz, and the high frequency number is meant the above person of 2000Hz.

At this more traditional acoustic construction (with reference to Figure 27.To call " structure of Figure 27 " in the following text) with the structure (with reference to Figure 28, to call " structure of Figure 28 " in the following text) of patent documentation 1, and transmission loss and sound absorbing power.

The weight of instrument panel silencing apparatus per unit area is 6.0kg/m in the structure of Figure 27 ², structure 4 employed every actual effect weight per unit areas of Figure 28 are 2.0kg/m ²These goods are used to be installed on the body panel of automobile.

The weight of this body panel per unit area is 6.2kg/m ²

Can find out that in the middle of the figure of the transmission loss of Figure 29 (a) structure of Figure 28 is that epidermal area and the panel dual structure by ventilation constituted, and middle use is the acoustical material with aeration resistance, so can obtain the transmission loss more than the weight rule.But because the per unit area weight of rubberized fabric is very high, thus the sympathetic response that penetrates of bigger low frequency number can be produced, thus significantly reduce transmission loss.

Can find out that in the middle of the figure of the transmission loss of Figure 29 (a) structure of Figure 28 is that epidermal area and the panel dual structure by ventilation constituted, epidermal area has aeration, so can produce the sound leakage under the cycle number, can obtain the transmission loss below the weight rule.Sound isolation property in the structure of Figure 28, can't obtain sufficient transmission loss.

Can find out that in the middle of the acoustic absorptivity figure of Figure 29 (b) the low frequency number has and can produce cycle upwards because of strong epidermis resonance in the structure of Figure 27, but but almost can't see acoustic absorptivity at middle cycle and high frequency number.

Can find out in the middle of the acoustic absorptivity figure of Figure 29 (b), utilize the epidermis resonance of the high epidermal area of aeration resistance and the sound absorbing power of sound absorbing layer behind in the structure of Figure 27, therefrom cycle is counted to the high frequency number and all can be reached and have sound absorbing power.

At the instrument panel silencing apparatus that has influence on actual automobile quietness partly, can go into to shine from each position of automobile from the direct voice of instrument panel incident, the indirect sound that is reflected is more, compare with traditional structure, the way of patent documentation 1 can significantly reduce transmission loss, sound-absorbing power more than the middle cycle is higher relatively, can promote the sound-absorbing power in the compartment, guarantees quiet property in the almost equal compartment.And because product weight significantly alleviates, therefore recent instrument panel structure all adopts this kind way.

But on some car type, because the relation of vehicle structure makes that the influence of direct voice is bigger, in the structure of Figure 28, transmission loss deficiency (with reference to Figure 29 (a)) therefore can't be guaranteed the quiet property in the compartment.In addition, uneven part is arranged on the actual product, the thickness of sound absorbing layer also has the variation of 1～30mm.Thus, the high frequency number shown in the structure of Figure 28 of patent documentation 1 utilizes the sound-absorbing power effect of sound absorbing layer, because its sound absorbing layer thickness reduces, so sound absorbing power also glides.And sound absorbing layer is the Buddhist nun that contracts (felt, felt with thickness 30～50mm.) institute that is shaped produces, and is also lower than general face than the aeration resistance of the part that approaches, and can't obtain enough sound-absorbing power.Quiet property in the sound-absorbing power sufficient to guarantee compartment of the instrument panel silencing apparatus of the structure of former patent document 1, however also can't bring into play enough performances because of above-mentioned factor.

In addition, the purpose of traditional sound-proof material is exactly in order to reduce the sound that penetrates outside the compartment originally, therefore the sound to extensive cycle can both reach good sound absorption power, but since in the compartment to reflecting the sound-absorbing undertreatment of sound, cause as shown in figure 30, the center cycle of 1/3 octave band (octave band) is very important to the talk sharpness at 800Hz～1600Hz, from the viewpoint of talk sharpness, than high frequency, just inadequate near the sound-absorbing of the cycle of 1000Hz.

In the middle of patent documentation 2, as shown in figure 31, when utilizing acoustical material to come sound to the cycle more than the 1000Hz to carry out sound-absorbing, when the sound absorbing layer attenuation, often acoustic absorptivity will reduce.

Though the sound-proof material of Figure 28 structure has the return the vehicle to the garage and knock off function of railway carriage or compartment internal reflection sound of back suction, to the controlling schemes of sound-absorbing cycle and indeterminate.

In the patent document 3,4 the sound-absorbing cloth of traditional sound-proof material and stationary state, the acoustical absorbance properties of epidermis portion throughput, the having a strong impact on all of screening sound characteristic at interface, top layer are ignored.Complex-shaped in the actual goods must possess certain interface binding intensity, and different design conditionss can make sound-absorbing, it is also all different to hide the sound characteristic.It may also can't be applied in the small space in addition.

So the present invention not only can promote soundproof effect to the direct voice from body panel incident, be purpose just with the transmission loss that promotes the low middle cycle of transmission loss, therefore have in actual product and also can guarantee sufficient sound-absorbing power when concavo-convex because of the sound absorbing layer attenuation, be purpose to the sound-absorbing power of high frequency number just with cycle in promoting (the noise level scope of the cycle frequency domain when particularly comprising the people and talking), particularly improve the sound-absorbing power of the cycle that the sound-absorbing power to past 315～800Hz is not easy to promote, and be purpose more to alleviate acoustical material weight.

Two, solution

Because aforementioned every problem, the present invention's inventor is except the bond state at the interface between the resonant layer that is conceived to sound absorbing layer and non-gas penetration potential, also drop to non-aeration resonant layer weight extremely low, the cycle of control transmission loss and acoustic absorptivity, isolate the noise that the compartment unofficial biography are gone into, guarantee the sound-absorbing level in the compartment, to promote the quiet property in the compartment.

The invention that application project 1 is put down in writing is the Ultralight sound insulator with following feature: with thickness 1～100mm, and density 0.01～0.2g/cm ³, 0.03～0.08g/cm preferably ³Light-duty sound absorbing layer and see through with this sound absorbing layer that bonding coat is bonding, the weight of per unit area is at 600g/m ²Below, 300g/m preferably ²Following non-aeration resonant layer constitutes; The cohesive strength of the bonding coat of aforementioned sound absorbing layer and non-aeration resonant layer is 180 degree in strips off amplitude 25mm following time, peels off and better is set in 1～20N/25mm, 3～10N/25mm preferably; The aforementioned adhesion layer better is with 50～100% to all interfaces of aforementioned sound absorbing layer and non-aeration resonant layer, and preferably with 80%～100% area bonding, aforementioned sound absorbing layer is configured in the body panel side, and aforementioned non-aeration resonant layer is arranged on the inboard, compartment.

Above-mentioned stripping means is similar with " JIS K6854 Fig. 4: 180 degree are peeled off ", and peeling rate is to divide with 200mm/ to carry out.

The interface of aforementioned non-aeration resonant layer and sound absorbing layer is to see through the aforementioned adhesion layer, and is bonding with enough cohesive forces, sees through this interface resonance between aforementioned sound absorbing layer and the non-aeration resonant layer and the energy sound-absorbing, and this sound-proof material possesses this feature.Here adopted aeration " fragile (fragile) shape testing machine " that JIS L1018 8.3.3.1 compiles ground with its as a result the high aeration testing machine of association measure, non-aeration means that this throughput is below the minimum mensuration ability of equipment, at 0.1cm ³/ cm ²Below the sec.Aforesaid sound absorbing layer preferably has air layer.

The present invention's inventor shows that non-aeration resonant layer and the peel strength of the interfacial state of sound absorbing layer and sound absorption properties to the bonding coat bond area influence and make the present invention because find out.The principle of ultra-light sound insulator of the present invention has been to utilize the suction of the resonance effect at interface between non-aeration resonant layer and the sound absorbing layer because of effect.The bonding coat of utilization between non-aeration resonant layer and sound absorbing layer just can pass through the sound cycle of control institute sound-absorbing, and utilize the membrane resonance of non-aeration resonant layer and sound absorbing layer to come sound-absorbing the sound in the compartment on the interface.

The configuration structure of non-aeration resonant layer can design on all sound-absorbing aspects, also can be arranged on the either party that on the part of sound absorbing layer, also can be located at face side, inner face side.

Form sound absorbing layer and to the non-aeration resonant layer in the car indoor of this sound absorbing layer (particularly being the non-aeration foaming layer of right and wrong ventilating permeability film layer or ultralight amount).What sound absorbing layer and bonding coat adopted is non-aeration or aeration material.As long as sound absorbing layer possesses sound absorption properties, no matter be the ventilation or stuffiness can.For example urethane casting film (Mold) is non-aeration material.

The cycle of 1/3 multiplying power frequency band (octave band) and the binding part area of sound absorbing layer are 50～100%, preferably more than 80%.Can do comprehensive bonding or part bonding.It is bonding for example preferably to see through the bonding coat continuity between sound absorbing layer and the non-aeration resonant layer, and the point that is equivalent to 1～50dot/cm is followed, and also can adopt the wire bonding.As adopting adhesive film, also can adopt comprehensive bonding in addition.

Bonding Strong degree is 1～20N/25mm, preferably 3～10N/25mm at strips off amplitude 25mm, 180 degree when peeling off.

The material of non-aeration resonant layer is non-aeration, as foamed resin or resin molding.Sound absorbing layer can be non-aeration or aeration material, and for example contract Buddhist nun (felt), the anti-rough lumber of chemical fibre, PET fiber etc. of thermoplasticity are changed with bonding (Binder) fiber Buddhist nun (felt) that contracts.The material of bonding coat can be non-aeration or aeration person, as Ethylene Vinyl Acetate (hereinafter to be referred as EVA), urethanes cementing agent etc.

The of the present invention aforementioned sound-absorbing that application project 2 is put down in writing is the Ultralight sound insulator that polylayer forest formed that possesses by high density sound absorbing layer and low density acoustic layer.

The density of the of the present invention aforementioned high density sound absorbing layer that application project 3 is put down in writing is 0.05～0.20g/cm ³, thickness is in 2～70mm scope, and the density of aforementioned low density acoustic layer is 0.01～0.10g/cm ³, thickness is between 2～70mm, as application project 2 described Ultralight sound insulators.

Among the present invention that application project 4 is put down in writing, the initial stage compression bounce of aforementioned high density sound absorbing layer is 30～600N, 50～300N preferably, the initial stage compression bounce of aforementioned low density acoustic layer is 5～300N, 10～100N preferably, the initial stage compression bounce of aforementioned high density sound absorbing layer is 1.2～40 times that the initial stage of aforementioned low density acoustic layer compress bounce, preferably 1.5～5 times, in the thickness of aforementioned sound absorbing layer, the high density sound absorbing layer accounts for 20～80% of thickness, preferably 40～60%, as application project 2 and 3 described Ultralight sound insulators.

Initial stage compression bounce here and high density sound absorbing layer thickness can make a difference to the spring position of spring-like vibrations.That is to say that the high density sound absorbing layer that initial stage compression bounce is high sees through the bonding coat bonding, can promote the rigidity of non-aeration resonant layer, allow the resonance cycle move the high frequency side.And when the poor rigidity of high density sound absorbing layer and low density acoustic layer is incorrect, may just can't produce the cycle of high frequency side and low frequency side resonance.

The assay method of its of the acoustical material that sound absorbing layer adopted compression bounce is that the cylindric material with φ 100mm, thickness 20mm is trimmed to sound absorber and is used as test portion at initial stage.

As shown in Figure 1, loading on aforesaid material, the bounce when being compressed to 5mm is measured with loading determinators such as Tensilon.The loading speed of this moment is the 50mm/ branch.When measuring reference value system and compress with 2.5mm and the condition of 7.5mm when compressing measure simultaneously.

Fig. 1 is the assay method of initial stage compression bounce.Will with the cylindric acoustical material that is cut into of φ 100mm in addition loading compress.

Fig. 2 is the measurement result of being done at PET (PolyethyleneTerephtalate), the Buddhist nun that contracts (felt), RSPP (is the made regeneration sound-proof material of raw material with shredded paper dirt), PUF (Polyurethane foam) for the measurement result of initial stage compression bounce.The sound absorbing layer compression bounce here is the numerical value that involves the spring rate of damping material.Contract Buddhist nun (felt) material of past as one of sound-proof material also is a kind of damping material.The energy of damping material energy absorbing vibration converts heat energy to.That represent damping effect characteristic is loss coefficient η.This loss coefficient η calculates with following formula.

Formula 1 η: Damage Shi Department number

η ': Xi Yin Cai Damage Shi Department number

E1: resonance Layer Bomb leads

E2: sound-absorbing Layer Bomb leads

H1: resonance Layer thickness

H2: sound-absorbing Layer thickness

Aforesaid sound absorber, what preferably adopt is the polylayer forest that is combined into by high density sound absorbing layer and the two-layer different materials of low density acoustic layer, or employing homogenous material but possess the high density side and the material of the density distribution of low-density side.

Aforesaid sound absorber, employing be the polylayer forest that is combined into by high density sound absorbing layer and the two-layer different materials of low density acoustic layer, preferably adopting has 2 layers of material to constitute in each high density and low-density acoustical material.Perhaps adopt homogenous material but possess the high density side and the material of the density distribution of low-density side, in non-aeration resonant layer side, the high density side also can obtain identical effect by 2 layers of the bonding one-tenth of bonding coat.

On the one side of aforementioned high density sound absorbing layer, it is bonding that aforesaid resonant layer sees through aforementioned cementing agent, and on the one side of aforementioned low density acoustic layer, with the opposing face of the aforementioned resonant layer of aforementioned high density sound absorbing layer on to see through other bonding coat bonding, or lamination also can.Or on homogenous material, there be the density configuration different of high density side also good with the low-density side.

The material of sound absorbing layer is contract Buddhist nun (felt), Polyester class contract Buddhist nun's (felt) etc. PET (Polyethylene Terephtalate) class the contract sheet material, RSPP etc. of Buddhist nun (felt), urethane die casting product, urethane foaming of thermoplasticity preferably.

In the invention that application project 5 is put down in writing, aforementioned sound-absorbing series of strata individual layer, density 0.02～0.20g/cm ³, thickness 2～70mm, the Ultralight sound insulator shown in application project 1.Sound absorbing layer preferably adopts homogenous material.

In the invention that application project 6 is put down in writing, in the invention that aforementioned sound absorbing layer application project 6 is put down in writing, the initial stage of aforementioned sound absorbing layer compression bounce is 2～200N, is preferably 20～100N, and cording is equipped with this feature as the Ultralight sound insulator as described in the application project 5.

In the invention that application project 7 is put down in writing, in the aforementioned adhesion layer not bonding aforementioned non-aeration resonant layer the face of inboard, compartment bonding the 2nd sound absorbing layer, the density of aforesaid the 2nd sound absorbing layer is 0.01～0.2g/cm ³, thickness is 1～20mm, preferably density is 0.05～0.15g/cm ³, thickness is 4～10mm, possess this feature as application project 1 to 6 Ultralight sound insulator as described in arbitrary.

As long as the 2nd sound absorbing layer is fixed on the aforementioned non-aeration resonant layer, non-bonding and place (for example the 2nd sound absorbing layer being fixed on the panel of car bodies such as instrument panel or floor with resonant layer, sound absorbing layer) with the lamination state merely with slide fastener (icon omission), interval bonding that also can 20～100mm etc. is done local bonding, or utilizing bonding coat to do bondingly comprehensively also can.The then intensity of the 2nd sound absorbing layer and resonant layer is that strips off amplitude 25mm, 180 degree are 0.1～20N/25mm, preferably 3～10N/25mm when peeling off.The 2nd sound absorbing layer sometimes is that single face is arranged on the non-aeration resonant layer comprehensively, has to cooperate actually to be arranged on the higher position of noise reflection in the compartment.The 2nd sound absorbing layer can be single or multiple lift.As be multilayer, the lamination of sound absorbing layer can adopt adhesive coating to connect.During bonding multiple layer sound suction layer, the mechanical piercing power such as mode that can adopt cementing agent, adhesive film, mechanicalness for example to engage with pin seam (Niddle punch) engage.

Aforementioned the 2nd sound absorbing layer of the invention that application project 8 is put down in writing is a single or multiple lift, as application project 7 described Ultralight sound insulators.

Aforementioned the 2nd sound absorbing layer of the invention that application project 9 is put down in writing is a multilayer, its lower floor and resonant layer bonding, or upper strata and lower floor utilize mechanical piercing power lamination, as application project 7 or 8 arbitrary described Ultralight sound insulators.Particularly, lower floor is with membrane resonance layer bonding, or the film upper strata is stitched the mode lamination with Buddhist nun (felt) lower floor of contracting with pin.

The invention that application project 10 is put down in writing, the structure of aforementioned non-aeration resonant layer is foaming body or film body, as when being aforementioned foaming body, its thickness is 1～7mm, 2～3mm preferably, as when being aforementioned film body, thickness is 10～600 μ m, be preferably 20～300 μ m, as application project 1 to 9 arbitrary described Ultralight sound insulator.

Sound absorbing layer has the low density acoustic characteristic of non-aeration or aeration, because non-aeration resonant layer is easier to vibrations when bass or shock energy, so quality must be very light.

The material of non-ventilation resonating membrane preferably Olefin resin film, Polyester film etc. Polyethylene Terephtalate polyester (PET) class film, urethanes resin molding or its complex constitutes.Non-ventilation independent resonance foaming body is Polypropylene foaming body (to call PPF in the following text) preferably, the Orphan class foaming body of Polyethylene foaming body (to call PEF in the following text) etc.

Adopt this invention, can improve talks understands degree, therefore not good to the sound-absorbing Z-TEK of 1000～1600Hz sound.This be the thickness of aforementioned sound absorbing layer can be continuously, when changing arbitrarily effective so.In this scope, because the cloth cover of cycle resonance and can improve sound-absorbing power effect, allow the good quiet property of acquisition in the compartment.The thickness of ultra-light sound insulator is also disputed, so ability cloth cover resonance effect, obtains very high acoustic absorptivity.

Compare with traditional acoustical material, sound-proof material of the present invention can significantly alleviate the weight of non-aeration resonant layer.Aforementioned non-aeration resonant layer, the weight of per unit area is at 600g/m ²Below, be preferably in 300g/m ²Below; The aforementioned non-aeration altogether structure of layer is foaming body or film body, and thickness is 1～7mm as for aforementioned foaming body the time, is preferably 2～3mm, as when being aforementioned film body, thickness is 10～600 μ m, preferably 20～300 μ m.

The weight of per unit area for example, sound insulation type is 4000～10000g/m ², the sound-absorbing type is 500～2000g/m ², the weight of per unit area in the present invention, non-aeration resonant layer is 200g/m ²Below.

The thickness of bonding coat is 1～100 μ m in addition, preferably 5～50 μ m.The weight of the per unit area of bonding coat is 5～200g/m ², 10～100g/m preferably ²The density of bonding coat then all can arbitrarily.

The full interface of indication is meant aforementioned non-aeration resonant layer and cohesible all interfaces of sound absorbing layer herein.An area of the area at full interface such as non-aeration resonant layer, sound absorbing layer is respectively S1, and during S2, as S1=S2, then full interface then is S=S1=S2, during as S1＞S2, and S=S2 then, during as S1＜S2, S=S1 then.Peel off the situation that the sound absorbing layer that is meant first front attachment and non-aeration resonant layer are peeled off under certain condition determination.The state of peeling off herein (for example contract Buddhist nun (felt) top layer destroy), binder interface are peeled off (for example all cementing agents all are bonded on the sound absorbing layer and peel off), cementing agent cohesion and are peeled off (for example sound absorbing layer and non-aeration resonant layer both sides have residual, cementing agent wire drawing to peel off) or the top layer of this material destruction, the interface peel of cementing agent, cementing agent and condense and peeling off under the combined state such as peel off.

Description of drawings

The 1st figure is the assay method key diagram of initial stage compression bounce.

The 2nd figure is an initial stage compression bounce measurement result guide look chart.

The 3rd figure is the basic structure key diagram of the embodiment of the invention 1.

The 4th figure is the instrument panel sectional view that the instrument panel silencing apparatus 1 of suitable the present invention's sound-proof material is suitable for.

(a) of the 5th figure (b) is respectively the cycle VS transmission loss of structure of structure, Figure 28 of the instrument panel silencing apparatus of the embodiment of the invention and Figure 27 and the graph of a relation of cycle rate VS acoustic absorptivity.

The 6th figure (a) (b) is respectively the graph of a relation of cycle rate VS acoustic absorptivity of the instrument panel silencing apparatus 1 of the embodiment of the invention.

The instrument panel silencing apparatus that the 7th figure (a) (b) is respectively the embodiment of the invention when relatively following layer is sufficient and inadequate, the graph of a relation of cycle VS transmission loss and cycle rate VS acoustic absorptivity.

The 8th figure is the chart attirbutes of instrument panel silencing apparatus at the cycle VS transmission loss of 1/3 multiplying power frequency band (octave band).

The 9th figure is the chart attirbutes of instrument panel silencing apparatus at the cycle VS acoustic absorptivity of 1/3 multiplying power frequency band (octave band).

(a) of the 10th figure is the essential structure key diagram of the embodiment of the invention 2 (sound absorbing layer by 2 layers of different densities constitute), (b) at the essential structure key diagram of the embodiment of the invention 3 (being provided with the 2nd sound absorbing layer on the non-aeration resonant layer).

The 11st figure be 2 sound absorbing layers of the relevant embodiment of the invention 2 and fixedly sound absorbing layer wear out loss figure at the cycle VS of the different densities of instrument panel 201.

The 12nd figure be 2 sound absorbing layers of the relevant embodiment of the invention 2 and fixedly sound absorbing layer at the cycle rate VS of the different densities of instrument panel 201 acoustic absorptivity.

The 13rd figure is for there being following layer, and the figure of the asynchronous cycle rate of sound absorbing layer density VS acoustic absorptivity.

The 14th figure is the figure that has or not cycle VS transmission loss under additional the 2nd sound absorbing layer and the engagement state.

The 15th figure does not have the 2nd sound absorbing layer and the fixing or fixing cycle rate VS acoustic absorptivity figure of aeration resonant layer when no acoustical material not on the instrument panel 301 of the embodiment of the invention 3.

The 16th figure is fixedly aeration resonant layer and the cycle rate VS acoustic absorptivity figure of the 2nd sound absorbing layer when no acoustical material on the instrument panel 301 of the embodiment of the invention 3.

The 17th figure is the essential structure key diagram of the embodiment of the invention 4 (during the sound absorbing layer individual layer).

The 18th figure is the cycle VS transmission loss figure of embodiment 4.

The cycle rate VS acoustic absorptivity figure of the 19th breakthrough embodiment 4.

The 20th figure is the essential structure key diagram of the embodiment of the invention 5.

(a) of the 21st figure is the essential structure key diagram of comparative example 1, (b) is the essential structure key diagram of comparative example 2, (c) is the concrete example essential structure key diagram of embodiment 5.

(a) of the 22nd figure is that cycle VS transmission loss, (b) of each structure of Figure 21 (a)～(c) is the respectively figure of the cycle rate VS acoustic absorptivity of structure of Figure 21 (a)～(c).

The 23rd figure (a) for the embodiment of the invention 5 rete is arranged with no rete correcting principle the time cycle VS transmission loss figure.

The 23rd figure (b) for the embodiment of the invention 5 rete is arranged with no rete correcting principle the time cycle rate VS acoustic absorptivity figure.

The 24th figure is the essential structure key diagram of embodiment 6.

The 25th figure is the planimetric map of transmission loss determinator.

The 26th figure is the planimetric map of acoustic absorptivity determinator.

The 27th figure is traditional acoustic construction key diagram.

The 28th figure is the acoustic construction key diagram of patent documentation 1.

The 29th figure (a) be the acoustic construction of prior art of relevant icon 27 and the patent documentation 1 shown in the icon 28 cycle with the transmission loss graph of a relation.

The 29th figure (a) be the acoustic construction of prior art of relevant icon 27 and the patent documentation 1 shown in the icon 28 cycle with the acoustic absorptivity graph of a relation.

The 30th figure is noise level figure in the compartment.

The 31st figure is the cycle of patent documentation 2 and the graph of a relation of acoustic absorptivity.

Label declaration in the accompanying drawing

Instrument panel silencing apparatus-1, sound absorbing layer-2,202,302,502,602, non-aeration resonant layer-3,203,303,403,503, bonding coat-4,204,202c, 305,45,404,504,504 ', instrument panel-10,201,301,401, high density sound absorbing layer-202a, 302a, 602a, low density acoustic layer-202b, 602b, the 2nd sound absorbing layer-306,506, the 1 sound absorbing layers-402, the 2nd sound absorbing layer-406, floor silencing apparatus-501,501 ', 501b, 601, epidermis/spacer layer-507,507 ', 507d, car bottom panel-510, car bottom panel-510a, upper strata-506a, lower floor-506b, Buddhist nun layer-503f contracts, fluffy material-509 ', 509a, epidermis/PE spacer layer-507g, hard cloth lamella-506h, Buddhist nun layer-503I contracts, fluffy material-509,509b, hard cloth lamella-506,506 ', 506e, the Buddhist nun's layer-502 ' that contracts, rete-503,503 ', loudspeaker-40, microphone-51～53.

Embodiment

Following reference illustrates the embodiment 1～6 of ultra-light sound insulator of the present invention.

The instrument panel silencing apparatus of embodiment 1 as shown in Figure 3, what thermoplasticity contracted Buddhist nun (felt) partly is with venting quality 10～50cm ³/ cm ²Sec is shaped, and urethane foaming body (Foam) then is by having 10cm ³/ cm ²The sound absorbing layer 2 of the venting quality that sec is following and non-aeration resonant layer 3 double-layer structures constitute.The bonding coat 4 that bonding is arranged between sound absorbing layer 2 and non-aeration resonant layer 3.Resonate and sound-absorbing in the sound absorbing layer 2 and the interface generation of non-aeration resonant layer 3.

The instrument panel 10 of Fig. 4 has been installed instrument panel silencing apparatus 1 for the iron panel in (engine chamber) and the compartment outside the isolation compartment along the inner surface of carriage side.Therefore instrument panel silencing apparatus 1 adopts the goods of ultralight amount in order to improve fuel efficiency and installation exercise performance, even and ultra lightweighting also possess enough acoustical absorbance properties.

Fig. 4 is the instrument panel silencing apparatus 1 of embodiment 1.Disposed in the compartment in regular turn, outside the instrument panel 10 of non-aeration resonant layer 3, bonding coat 4, sound absorbing layer 2, vehicle body, compartment.Sound absorbing layer 2 is disposed at instrument panel 10 sides, and non-aeration resonant layer 3 is arranged on the inboard, compartment.Sound absorbing layer 2 engages with instrument panel 10.Fluffy material is housed betwixt.

Sound absorbing layer 2 is that the shape of prolonging instrument panel 10 is shaped.The thickness of sound absorbing layer 2 preferably between 5mm～40mm, is shaped with any thickness below 50mm.The weight of per unit area is 500～2000g/m ², be preferably 1000～1600g/m ²The density of sound absorbing layer 2 is 0.01～0.2g/cm ³, 0.03～0.08g/cm preferably ³The initial stage compression bounce of sound absorbing layer 2 is 2～200N, preferably 20～100N.But if local thickness compression molding being arranged to 1mm, this density partly can be up to 0.5g/cm ³, sound absorption qualities reduces, but the sound insulation of this part is then still insured what no impediment shall arise owing to weight factor.

Sound absorbing layer 2 adopts the material of aeration or non-aeration.Preferably adopting the thermoplasticity Buddhist nun (felt) that contracts, is the anti-rough lumber of chemical fibre, PET fiber to be added intermixture (Binder) fiber make the Buddhist nun that contracts (felt).For example the regenerative PET fiber is sneaked into intermixture (Binder) low-melting point PET resin, on conveying belt, be piled into the cloth cushion, through after the heat treated, be shaped as required cloth cushion in the die-casting process mode, with after this cloth pad thermoplastic, with the cold-press moulding die forming required form that can cooperate 10 shapes of instrument panel then with required mold shape.The intermixture that is adopted if soak thermosetting resin, then adopts hot injection moulding to cast required shape.Intermixture can adopt thermoplastic resin, also can adopt thermosetting resin, so long as be made of the fiber assembly with outstanding acoustical absorbance properties, its material and shaping worker method all do not have specific.

As shown in Figure 4, sound absorbing layer 2 thickness in the following scope of 50mm can change arbitrarily, so the thickness of instrument panel silencing apparatus 1 also changes.

Change the thickness of sound absorbing layer 2 arbitrarily, the sound-absorbing scope can reach the extensive cycle of 315～4000Hz as a whole.

Non-aeration resonant layer 3 is that sound absorbing layer 2 is formed in the inboard, compartment.This mainly meeting and sound absorbing layer 2 and membrane resonance of non-aeration resonant layer 3 can absorb the sound in the compartment.Non-aeration resonant layer 3 is non-aeration resonance rete or non-aeration independent resonance foaming body.The per unit area weight of this non-aeration resonant layer 3 is at 200g/m ²Below, be preferably in 100g/m ²Below.The thickness of non-aeration resonant layer, as be foaming body then at 1～7mm, between 2～3mm, when being film body, then be 10～200 μ m preferably as non-aeration resonant layer, be preferably 20～100 μ m.The density of non-aeration resonant layer is 0.02～0.1g/cm when being foaming body ³, 0.03～0.06g/cm preferably ³As be film body, then be 0.9～1.2g/cm ³, 0.9～1.0g/cm preferably ³

The material of non-aeration resonant layer 3 is alkene hydroxyl (Olefine) resin film, PolyethyleneTelephtalate Polyester class film, Polyurathan resin film or the complexs of aforementioned material such as (PET).Non-aeration resonance foaming body is alkene hydroxyl (Olefine) the class foaming body of Polypropylene foaming body (to call PPF in the following text), Polyethylene foaming body (to call PEF in the following text) etc.

The per unit area weight of bonding coat 4 is 5～200g/m ², 10～100g/m preferably ² Thickness 1～100 μ m of bonding coat is to be preferably 5～50 μ m.Density is that the density values of general cementing agent gets final product.The cohesive strength of bonding coat 4 is 1～20N/25mm, preferably 3～10N/25mm.Bond area rate from 50% to 100% is preferably between 80%～100%.Can do comprehensive bonding or partly bond and all can.For example can do the continuity bonding by bonding coat between sound absorbing layer 2 and the non-aeration resonant layer 3, also can engage, or bond with wire in the point bonding mode that is equivalent to 1～50dot/cm.If when bonding, also can do comprehensive bonding in the adhesive film mode.The material of bonding coat 4 can be selected the resin of EVA class, urethanes, Chroloprenlatex (CR) class, Stylen Buthadiene class condensate (SBR) class, acryl class, alkene hydroxyl (Olefine) class etc.But can reach certain cohesive force in order to ensure non-aeration resonant layer 3 with sound absorbing layer 2, had better not use the material that to guarantee cohesive force.

In the shaping worker method of sound absorbing layer 2 and non-aeration resonant layer 3, the worker's method of manufacturing paper with pulp of sound-proof material is to carry out lamination with card moral machine, or use the Random machine of manufacturing paper with pulp, should do smoothly as far as possible with the commissure of non-aeration resonant layer 3, this is in order to ensure practical then area, can make non-aeration resonant layer 3 meet the requirements of efficient.

About promoting the soundproof effect of the direct voice that instrument panel 10 is imported into, just promote the problem aspect of the transmission loss of the low middle cycle of transmission loss, the non-aeration resonant layer 3 that utilization significantly alleviates than instrument panel 10 weight per unit areas is provided with a sound absorbing layer 2 with aeration resistance as epidermal area between panel 10 and non-aeration resonant layer 3.But also the interface of non-aeration resonant layer 3 that does not have in the control past conventional art and sound absorbing layer 2 (utilizing bonding coat 4 control cohesive forces).Because non-aeration resonant layer 3 significantly reduces weight per unit area to 200g/m ²Below, therefore penetrate sympathetic response and lower position (with reference to Fig. 5 (a) (b) (1)) except meeting appears at the higher position of cycle, also can occur.Double-layer structural also guarantees to have promoted transmission loss (with reference to Fig. 5 (a) (3)) in addition.

Even the uneven of actual product allows sound absorbing layer 2 attenuation also can guarantee enough sound-absorbing power, that is to say that counting to high frequency for middle cycle counts the problem that scope promotes sound-absorbing power, even owing to the installation of part, the influence in space make sound absorbing layer 2 attenuation, also can utilize sound absorbing layer 2 to guarantee high acoustic absorptivity with the membrane resonance of non-aeration resonant layer 3.When the per unit area weight of resonant layer is 50g/m ²The time, sound absorbing layer 2 thickness are as shown in table 1 below with the relation of resonance cycle fr.

Table 1

Sound-absorbing Layer thickness (mm)	30	?25	?20	?10	?5
						Resonance cycle (Hz)	1531	?1677	?2166	?2652	?3750

Sound in the compartment is diffusion incident, but not 3 of aeration resonant layers are low because of light weight, rigidity, so resonance can independently take place in more among a small circle.So when the value of the thickness L of sound absorbing layer 2 became 30～5mm, the resonance cycle will be changed to 1531～3750Hz, as Fig. 6 (a), (b) shown in, can guarantee large-scale acoustic absorptivity, and have and differ from the sound absorbing layer that does not have non-unsaturated zone, can guarantee very high sound-absorbing power.

In this vibrating mode with general spring MASU class, when using the mechanicalness spring of gross mass of the air spring of sound absorbing layer 2 and sound absorbing layer 2, non-aeration resonant layer 3, the formula of its resonance cycle can be from spring ratio k=ρ C in general spring vibrations formula ²/ L calculates the resonance cycle fr of formula 2.Wherein, fr is resonance cycle (Hz), and ρ is atmospheric density (1.2kg/m ³), c is that factor (340m/s), m are the per unit area weight (g/m of non-aeration resonant layer 3 ²), L is the thickness (mm) of sound absorbing layer.

Formula 2

$\mathrm{fr}=\frac{1}{2\mathrm{\&pi;}}\sqrt{\frac{{\mathrm{\&rho;<figure-callout\; id="2"\; label="C"\; filenames="S04808064019970221E000041.png,S04808064019970221E000131.png"\; state="\{\{state\}\}">C</figure-callout>}}^2}{\mathrm{mL}}}$ Resonance cycle: fr

ρ: empty Gas density 1.2kg/m ³

C: velocity of sound 340m/s

M: every Single Wei Mian Plot weight of resonance Layer

L: the thickness of sound-absorbing Layer

Sound-absorbing power for past 250～500Hz will promote on the problem of sound-absorbing power at the cycle that is difficult for improving, since non-aeration resonant layer 3 by well-bonded on sound absorbing layer 2, the Masu of sound absorbing layer 2 is increased, the resonance cycle that causes non-aeration resonant layer 3 Dan Pin is outside the high frequency side shifting, because aforesaid bonding also makes the resonance cycle appear at low frequency and counts side (with reference to Fig. 7 (a) (b) (5)), because the power of enforcement of sound absorbing layer 2 has reduced the transmission loss reduction amount that caused of resonating (with reference to Fig. 7 (a) (b) (5)).The gross mass of the air spring of sound absorbing layer 2 and sound absorbing layer 2 and non-aeration resonant layer 3 causes the wave zone at spring Masu315～630Hz to resonate, and has improved the acoustic absorptivity (with reference to Fig. 7 (a) (b) (6)) of this cycle.

This structure has produced the double wall effect of instrument panel silencing apparatus 1 with panel 10 (what use is iron panel) herein, thereby obtains the above transmission loss of weight rule.And can cause that this effect worsens penetrate the sympathetic response cycle owing to only can produce extremely slight amount at epidermal area (non-aeration resonant layer 3), and transmission loss is occurred on the very high cycle field, and this layer of epidermal area resonant layer 3 quality are extremely light, simultaneously by the cohesive force of control resonant layer 3 with sound absorbing layer 2, therefore can guarantee enough cohesive forces and bond area, utilize the damping minimizing of sound absorbing layer to penetrate sympathetic response, and can reduce the reduced amounts (with reference to Fig. 7 (a)) of transmission loss.On the other hand, acoustical absorbance properties is because non-aeration resonant layer 3 quality are extremely light, and with the THICKNESS CONTROL of sound absorbing layer 2 below 50mm, therefore the resonance cycle can be controlled at 315～4000Hz, obtain high acoustic absorptivity.(640～1250Hz) can be because non-aeration resonant layer 3 single product resonate the higher middle cycle wave zone of cycle, and can put forth effort with bond area mutually bonding with sufficient bonding between non-aeration resonant layer 3 and the sound absorbing layer 2, so the utilization sound absorbing layer 2 partly spring Masu resonance of quality can occur between 315 lower～630Hz of cycle, has improved sound absorption properties (with reference to Fig. 7 (b)).The non-aeration resonant layer 3 that has the instrument panel silencing apparatus 1 of this kind structure is compared than layer with table in the past, because the weight of per unit area becomes very light, and can fully isolate direct voice (referring to sound here) from engine chamber from instrument panel 10 incidents, also have the sound that will (refer to) institute's incident here simultaneously and in the compartment, absorbs the sound-absorbing effect that reflects indirect sound from other position from the sound beyond the engine chamber.

In certain embodiments, non-aeration resonant layer 3 is that the thin layer by softness is constituted, therefore the sound in the compartment is for interfering with this non-aeration resonant layer 3, sound absorbing layer 2 can produce the film vibrations with non-aeration resonant layer 3, therefore will produce resonance effect with sound absorbing layer 2 at non-aeration resonant layer 3 and come sound-absorbing.In addition, utilize the bonding coat 4 that is positioned on non-aeration resonant layer 3 and sound absorbing layer 2 interfaces, just can on the interface, control the sound cycle of sound-absorbing.In the middle of present embodiment 1, can improve the sharpness of talking, so particularly good at the sound-absorbing degree of 1000～1600Hz.The per unit area weight of non-aeration resonance layer of cloth and the thickness of sound absorbing layer 2 are altered to 10～500g/m ²And below 1～50mm, the cycle in this scope can obtain good quiet property with regard to obtaining to improve the effect of sound-absorbing power because of the resonance of cloth sheet in the compartment.Even the thickness attenuation of instrument panel 1, owing to utilized the resonance effect of cloth, so can obtain very high acoustic absorptivity.With respect to traditional sound-proof material, just can significantly lower the weight of non-aeration resonant layer.

Embodiment 1

The data of comparing embodiment and comparative example, its result such as Fig. 8, shown in Figure 9.In the structure of comparative example, except when the bond area of bonding coat 4 20% o'clock with 90% o'clock difference outside, all the other conditions are all identical with embodiment.The thickness of instrument panel 1 is 22mm, and the thickness of sound absorbing layer 2 is 20mm, and the thickness of non-aeration resonant layer 3 is 2mm, and the thickness of bonding coat 4 is 50 μ m.The non-aeration resonant layer 3 of instrument panel silencing apparatus 1 adopts polypropylene (Polypropyrene) foaming body (PPF), 30 times of frothing percentages, proportion 0.031g/cm ³, thickness 2mm, per unit area weight is 62g/m ²Sound absorbing layer 2 adopts the thermoplasticities Buddhist nun (felt) (Buddhist nun that generally contracts who utilizes polyester (Polyester) and assorted cotton to make) that contracts, proportion 0.06g/cm ³, thickness 20mm, per unit area weight is 1200g/m ², the bond area of bonding coat is 90%.With water-soluble EVA is the last coating of polypropylene (Polypropyrene) foaming body (PPF) 50g/m that cementing agent spreads upon 30 times of frothing percentages, thickness 2mm ², thermoplasticity contract the Nietzsche with pin seam mode will the Buddhist nun constitutes by contracting sound absorbing layer 2 with pressure 1kg/cm ²Do 60 seconds compression.When if rate of drying is too slow, can heats and compress about 30 seconds.Cohesive strength after the bonding is 2～8N/25mm, and about 90% of interface all bonds together.The state of peeling off is that the thermoplasticity of sound absorbing layer 2 Buddhist nun that contracts the top layer can occur and destroys.The Buddhist nun that contracts who stitches the contract Buddhist nun and the non-pin seam mode of mode with pin compares, and the top layer breakdown strength is higher, so cohesive strength rises to 5～10N/25mm.

In Fig. 8, relatively the bond area of bonding coat is can find with 20% o'clock situation that bond area was at 90% o'clock at 90% o'clock, and transmission loss can be than bond area 20% rising during cycle scope more than 400Hz.Therefore just can reduce the noise of outside the compartment, invading and coming.And compare with the Buddhist nun that contracts of contract Buddhist nun and the non-pin seam mode of pin seam mode, the top layer breakdown strength is also higher, and just cohesive strength reaches 5～10N/25mm, and in the cycle scope of show in the drawings, 400Hz is above, transmission loss also can many raising 1～3dB.

In Fig. 9, relatively the bond area of bonding coat is can find with 20% o'clock situation in 90% o'clock, bond area is 90% o'clock, when 630Hz～1600Hz cycle scope, cohesive force and bond area can have influence on non-aeration resonant layer, produce shockproof, damping effect, and acoustic absorptivity can reduce, but because acoustic absorptivity is still more than 0.6, so still can absorb noise in the compartment.In comparative example, because the relation of non-aeration resonant layer 3, acoustic absorptivity rises.Scope beyond 630Hz～1600Hz cycle is 90% o'clock as bond area, and cohesive force and bond area can cause non-aeration resonant layer and sound absorbing layer generation resonance effect, so acoustic absorptivity also rises can be than bond area 20% time.Therefore more can reduce the noise in the compartment in the time of can be when this cycle scope than bond area 20%.And near the cycle 400～500Hz because non-aeration resonant layer and sound absorbing layer can produce the resonance cycle each other, therefore can obtain 0.7 acoustic absorptivity, middle cycle to the reduction compartment in noise helpful.

Figure 10 (a) is the instrument panel 201 of embodiment 2.The structure of its instrument panel silencing apparatus 1 is identical with embodiment 1, therefore continues to use the preceding paragraph explanation.The structure difference is the density difference of sound absorbing layer 202, the sound-absorbing series of strata are made of the high density sound absorbing layer 202a and the low density acoustic layer 202b of different densities, sound absorbing layer 202a and 202b are configured in instrument panel 10 sides, and 203 of non-aeration resonant layers are configured in the inboard, compartment.Low density acoustic layer 202b engages with instrument panel 10.

High density sound absorbing layer 202a sees through aforesaid bonding coat 204 with non-aeration resonant layer 203 and engages.The density of high density sound absorbing layer 202a is 0.05～0.20g/cm ³, thickness is in 2mm～30mm scope.Low density acoustic layer 202b joins through bonding coat 202c at the opposition side of non-aeration resonant layer 203 and the face of high density sound absorbing layer 202a, and density is 0.01～0.10g/cm ³, thickness is in 2～30mm scope.The initial stage compression bounce of high density sound absorbing layer 202a is 30～400N, the initial stage compression bounce of low density acoustic layer 202b is 0.5～200N, the initial stage compression bounce of high density sound absorbing layer 202a is at least 1.2～40 times of low density acoustic layer 202b, in the thickness of sound absorbing layer 202, high density sound absorbing layer 202a institute accounting thickness proportion is 20～80%.The initial stage compression bounce of best high density sound absorbing layer 202a is 200～300N, the initial stage compression bounce of low density acoustic layer 202b is 50～100N, the initial stage compression bounce of high density sound absorbing layer 202a is at least 1.5～5 times of low density acoustic layer 202b, in the thickness of sound absorbing layer 202, the shared thickness proportion of high density sound absorbing layer 202a is 40～60%.In sound absorbing layer 202, the individual material of high density sound absorbing layer 202a and low density acoustic layer 202b is polylayer forest or homogenous material, and the material of variable density is arranged to the low-density side from the high density side.

In addition, the material of sound absorbing layer 202, non-aeration resonant layer 203, following layer 204 is identical with embodiment 1.

In the instrument panel silencing apparatus 201 of the embodiment 2 shown in Figure 10 (a), when sound absorbing layer 202 adopts the 2 layers-high density sound absorbing layer 202a of different densities and low density acoustic layer 202b, when sound absorbing layer 202 adopts the equal densities material, compare its cycle and transmission loss, the result as shown in figure 11.Because sound absorbing layer 202 adopts the high density sound absorbing layer 202a of different densities and the double-decker of low density acoustic layer 202b, (transmission loss more than 640～1250Hz) more significantly is improved at middle cycle.

Figure 12 is the sound absorbing layer 202 of relevant different densities, its double-decker comprises high density sound absorbing layer 202a and the low density acoustic layer 202b that is positioned at instrument panel 201, as icon 10 (a) those shown of second embodiment, and the cycle rate-acoustic absorptivity figure of the constant density sound absorbing layer 2 of the instrument panel 1 of relevant icon 3 at first embodiment.Be that comparison diagram 3 is during with Figure 10 a structure (not having the 2nd sound absorbing layer) and the situation of the cycle VS acoustic absorptivity of the 1st sound absorbing layer under equal densities and different densities of Figure 17 structure and Figure 10 b structure (the 2nd sound absorbing layer is arranged).Embodiment 1 is sound absorbing layer density when identical, and only (640～1250Hz) high acoustic absorptivity obviously occurs in middle cycle scope.On the other hand, under the different situation of the 1st sound absorbing layer density, all demonstrate very high acoustic absorptivity from the far-ranging cycle of 315Hz～4000Hz.In embodiment 2, (noise of 640～1250Hz) specific cycle also can produce sound-absorbing effect to the cycle scope widely in being not only.Between the 400Hz and 1600Hz cycle of embodiment 2, the acoustic absorptivity of acoustic absorptivity during also than embodiment 1 different densities is also low, can obviously see the peak value of resonance cycle.This is because in embodiment 2, sees through bonding coat 204, is subjected to non-aeration resonant layer 203 and the event of the rigidity effects of high density sound absorbing layer 202a.When this rigidity high more, resonance cycle will go by migration high frequency number.In addition low frequency count the aspect the resonance cycle in the middle of embodiment 2 also in the same manner migration low frequency scope (125～500Hz) go.This is because the different densities of sound absorbing layer 202 is poor, and poor rigidity is not made a difference, because non-aeration resonant layer 203 produces the cause of spring Masu vibrations with the Masu of the quality summation of sound absorbing layer 202 and the spring of sound absorbing layer 202.

Figure 13 is for there being bonding coat 204, and its structure such as Figure 10 (a) the sound absorbing layer that is considered as 202 when constituting by 2 layers of institute of different densities, change the quality of non-aeration resonant layer 203, relatively the figure of its cycle VS acoustic absorptivity.The data of Figure 13 are the data when not having the 2nd sound absorbing layer 306, during the quality of for a change non-aeration resonant layer 203 of Figure 13, and the variation situation of the acoustic absorptivity peak cycle that the high frequency side is produced.But whether this phenomenon is no matter have the 2nd sound absorbing layer 306 all can produce.Therefore when Figure 13 is applicable to the 2nd sound absorbing layer 306, do not have a situation of the 2nd sound absorbing layer 306.Because counting the resonance cycle of aspect, the quality of non-aeration resonant layer 303, high frequency also can change.When the quality of non-aeration resonant layer 3 is 60g/m ²The time, can produce the resonance cycle of 1250Hz, the thickness of foaming body is 2～3mm, film is equivalent to 20～100 μ.When the quality of non-aeration resonant layer 3 is 300g/m ²The time, can produce the resonance cycle of 1000Hz, when the quality of non-aeration resonant layer 3 is 2000g/m ²The time, can produce the resonance cycle of 315Hz.The quality of non-aeration resonant layer 3 is heavy more, and the resonance cycle will migration low frequency number, also just can't reach desired cycle sound-absorbing effect.

Instrument panel silencing apparatus 201 at the embodiment 2 shown in Figure 10 (a), the density difference of sound absorbing layer 202 just, see through in the mutually bonding ultra-light sound insulator resonant layer 203 of bonding coat 204,1 vibrations that to be the air spring of sound absorbing layer 202 and non-aeration resonant layer 203 produced with the summation quality (being also referred to as Masu) of sound absorbing layer 202, and the elastic force that rigidity produced of the air spring of sound absorbing layer 202 and non-aeration resonant layer 203 and the Masu of non-aeration resonant layer 203 can shake.The air spring of this sound absorbing layer 202 and non-aeration resonant layer 203 add the vibrations that summation Masu produced of sound absorbing layer 202 can count the frequency domain (top of 125～500Hz) generation acoustic absorptivities at low frequency at Figure 15 (with reference to the broken line that does not have the 2nd sound absorbing layer 306).And the spring that rigidity produced of the air spring of sound absorbing layer 202 and non-aeration resonant layer 203 and the vibrations that Masu produced of non-aeration resonant layer 203, (1600～6400Hz) summit of acoustic absorptivity takes place can to count the field at high frequency in Figure 15 (with reference to the broken line that does not have the 2nd sound absorbing layer 306).The acoustic absorptivity peak value that takes place at the high frequency number can be subjected to the emergency situations influence.This is because non-aeration resonant layer 203 and the event of the rigidity effects of 204 pairs of non-aeration resonant layers 203 of bonding coat of high density sound absorbing layer 202a.

Embodiment 2

Embodiment 2 is different with the sound absorbing layer density of embodiment 1, and other condition is then identical.The density of high density sound absorbing layer 202a is 0.100g/cm ³, thickness is 10mm, per unit area weight is 1000g/cm ², initial stage compression bounce is 200N, the thermoplasticity Buddhist nun (felt) (with PET as intermixture, the Buddhist nun that contracts who makes with anti-hair of chemical fibre and PE fiber) that contracts; The density of low density acoustic layer 202b is 0.04g/cm ³, thickness is 10mm, per unit area weight is 400g/cm ², initial stage compression bounce is 50N, material is the cellucotton Buddhist nun that contracts.The cohesive force of bonding coat 204 is 5N/25mm.High density sound absorbing layer 202a and low density acoustic layer 202b also can adopt PET system hair to do the pin seam and be laminated.

Instrument panel silencing apparatus 301 among the embodiment 3 shown in Figure 10 (b) the structurally instrument panel silencing apparatus 201 with embodiment 2 is identical, and the non-aeration resonant layer 203 of embodiment 2 also adds on the face of inboard, compartment bonding coat 305 and the 2nd sound absorbing layer 306 in the compartment.Non-aeration resonant layer 303 see through the inboard bonding coat 305 in compartment (thickness can be random, for example 20 μ m～100 μ m all can) bonding with the 2nd sound absorbing layer 306 of light weight.The density of the 2nd sound absorbing layer 306 is 0.01～0.1g/cm ³, thickness is 1～10mm, preferably density is at 0.02～0.04g/cm ³, thickness is between 4～6mm.

The 2nd sound absorbing layer 306 that is additional to instrument panel silencing apparatus 301 among the embodiment 3 is to establish at the high frequency sound-absorbing effect that improves the inboard, compartment.What show from Figure 14 to Figure 16 is the influence that has added 306 pairs of transmission loss of the 2nd sound absorbing layer, and Figure 15 and Figure 16 have added the influence of the 2nd sound absorbing layer 306 backs to acoustic absorptivity.Transmission loss situation among Figure 14, (1) (2) make moderate progress than (3), and (1) is then also better than (2).In addition, the acoustic absorptivity of Figure 15 is not when having the 2nd sound absorbing layer 306, and resonant layer 303 itself produces resonance owing to limited than I haven't seen you for ages, and the high frequency field takes place, and (1600～6400Hz) resonance demonstrates very high acoustic absorptivity.(125～500Hz) also can resonate at the low frequency frequency domain simultaneously.When resonant layer 303 is with the material of no sound-absorbing effect fixedly the time, acoustic absorptivity can be towards direction shown in the arrow, and (1600～6400Hz) glide at the high frequency frequency domain.Relatively, when adding the 2nd sound absorbing layer 306 at resonant layer, as shown in figure 16, the sound-absorbing peak value that can be subjected to 306 influences of the 2nd sound absorbing layer, high frequency field at epidermis resonant layer 303 partly can reduce, but add the sound-absorbing effect of the 2nd sound absorbing layer 306 itself, therefore the material that is not had a sound-absorbing effect compared with resonant layer 303 is fixedly the time, and ((1600～6400Hz) acoustic absorptivity can improve 640～1250Hz)～high frequency number at middle cycle.

In the instrument panel silencing apparatus 301 in the embodiment 3 shown in Figure 10 (b), have on the ultra-light sound insulator of inboard bonding coat 305 in compartment and the 2nd sound absorbing layer 306, air spring, the 2nd sound absorbing layer 306 that can produce the 1st sound absorbing layer 302 shake with the summation Masu of non-aeration resonant layer 303 and the 1st sound absorbing layer 302.These vibrations are counted the field at low frequency in Figure 16 (broken line that the 2nd sound absorbing layer 306 is arranged) (it is the highest that acoustic absorptivity takes place in 125～500Hz) meetings.And the Masu of sound absorbing layer 302 and air spring and the 2nd sound absorbing layer 306 and non-aeration resonant layer 303 also can produce vibrations.High frequency frequency domain (1600～6400Hz) acoustic absorptivity peak value can take place at Figure 16 (the 2nd sound absorbing layer 306 is the broken line of resonant layer 303 fixedly) in these vibrations.The identical emergency situations that also is subjected to influences in this pattern.

The influence of the sound absorbing layer 302 of different densities can exert an influence to emergency situations in high density sound absorbing layer 302a, feeds through to the acoustic absorptivity summit that high frequency is counted side.

Embodiment 3

Embodiment 3 has added the 2nd sound absorbing layer 306 with embodiment 2 identical, engages with resonant layer 303 with the spacing of 100mm dot.The density of the 2nd sound absorbing layer is 0.04g/cm ³, thickness is 5mm, per unit area weight is 200g/cm ², initial stage compression bounce is 50N, material is the thermoplasticity Buddhist nun's (as intermixture, making the Buddhist nun that contracts with anti-hair of chemical fibre and PE fiber with PET) that contracts.

The instrument panel silencing apparatus 401 of embodiment 4 is with reference to Figure 17 explanation.In this embodiment 4, the 1st sound absorbing layer 302 of embodiment 3 is individual layer the 1st sound absorbing layer 402 (also being the sandwich construction with equal densities) of equal densities this employing, then the condition with embodiment 3 is identical for other, and dash number rises with No. 400 and compiles, and other key element is continued to use the front explanation.In Figure 17, configuration is in the compartment in regular turn, outside the 2nd sound absorbing layer 406, bonding coat 45, non-aeration resonant layer 403, bonding coat the 404, the 1st sound absorbing layer 402, compartment (engine chamber etc.), the 1st sound absorbing layer 402 is fixed on the instrument panel 10 of vehicle body, and 406 of the 2nd sound absorbing layers are faced in the compartment.On this instrument panel silencing apparatus 401, when not having bonding coat 404, non-aeration resonant layer 403 can produce Masu, and the 1st sound absorbing layer 402 can become spring, and the single vibrating mode of spring Masu class takes place.That is to say that the membrane resonance meeting of simple non-aeration resonant layer 403 occurs in middle cycle frequency domain (640～1250Hz).Relatively, when existing if any bonding coat 404, (the membrane resonance of 640～1250Hz) non-aeration resonant layers 403, (125～500Hz) also can resonate to count frequency domain at low frequency except previously described middle cycle field takes place in meeting.Hence one can see that, and the situation of spring Masu class of the spring of the Masu of aforementioned, non-aeration resonant layer 403 and the 1st sound absorbing layer 402 and the 1st sound absorbing layer 402 can take place.

Figure 18 shows that the effect of 404 pairs of transmission loss of bonding coat.As can be seen from Figure 18, can be when not having when bonding coat 404 is arranged, its transmission loss can rise to low frequency and count field (125～500Hz).Figure 19 is the effect of 404 pairs of acoustic absorptivities of bonding coat.As can be seen from Figure 19, when not having bonding coat 404, only (640～1250Hz) significant high acoustic absorptivity can occur in middle cycle field, but when bonding coat 404, from low frequency count the field (125～500Hz) to high frequency count frequency domain (1600～6400Hz) widely the cycle scope all can obtain very high acoustic absorptivity.Therefore (noise of 640～1250Hz) specific cycles also can extensively produce sound-absorbing effect to the cycle frequency domain in being not only.This principle is because the resonance cycle is not when having bonding coat 404, because non-aeration resonant layer only can (640～1250Hz) resonate at middle cycle frequency domain, but when bonding coat 404, (640～1250Hz) resonance also can appear at low frequency and count frequency domain (125～500Hz) cycle frequency domain in this.

Embodiment 4

Among the embodiment 4, the 1st sound absorbing layer in embodiment 3 is an individual layer, and the density of the 1st sound absorbing layer 402 is 0.04g/cm ³, thickness is 5mm, per unit area weight is 200g/m ², initial stage compression bounce is 50N, material is the thermoplasticity Buddhist nun's (as intermixture, making the Buddhist nun that contracts with anti-hair of chemical fibre and PE fiber with PET) that contracts.

Floor silencing apparatus 501 among the embodiment 5 shown in Figure 20 be fixed in separate outside the compartment with the compartment in iron car bottom plate 510 on, along the compartment installed inside.Therefore floor silencing apparatus 501 is relieved to ultra lightweighting with product weight in order to improve the transaction capabilities of fuel efficiency and installation, even and ultra lightweighting also possess sufficient acoustical absorbance properties.Its configuration is in the compartment in regular turn, outside the car bottom panel 510 of epidermis/spacer layer 507, the 2nd sound absorbing layer 506 of sandwich construction, non-aeration resonant layer 503, bonding coat 504, sound absorbing layer 502, vehicle body, compartment.Sound absorbing layer 502 is configured on the car bottom panel 510, and non-aeration resonant layer 503 is arranged on the inboard, compartment.Sound absorbing layer 502 engages with car bottom panel 510.

The floor silencing apparatus 501 of embodiment 5 has part identical with the physical extent of the instrument panel silencing apparatus 401 of embodiment 4, therefore continues to use the preceding paragraph explanation.On the emphasis of physical extent change, the thickness of its sound absorbing layer 502 is 5mm～100mm, and the per unit area weight of resonant layer 503 is below the 600g/m, to be preferably in 300g/m ²Below.Resonant layer is if film, and thickness is 10～600 μ, is preferably 20～300 μ.The density of the 2nd sound absorbing layer 506 is 0.01～0.2, is preferably 0.05～0.15g/m ³

Epidermis/spacer layer 507 is made of skin material and gasket material, for example tygon or EVA, SBR.The 2nd sound absorbing layer 506 is the single or multiple lift structure.For example the 2nd sound absorbing layer 506 is that sandwich construction by upper strata 506a and the 506b of lower floor constitutes among Figure 20.

On the 506a of upper strata, see through bonding coat 508 and engage, upper strata 506a following then bonding or be connected with laying state with the 506b of lower floor with epidermis/spacer layer 507.The 506b of lower floor is the hard cloth sheet (hard sheet) that the Buddhist nun forms that contracts, and engages with non-aeration resonant layer 503 below the 506b of lower floor.Upper strata 506a utilizes the relation of material sound-absorbing effect can improve sound-absorbing power high-frequency, and cycle sound-absorbing power in the resonance of the rigid body of the 506b of lower floor can promote can promote sound-absorbing power high-frequency with the elasticity resonance of the 506b of lower floor.Cycle sound-absorbing power during 506b of lower floor and sound absorbing layer 502 can promote because of the rigid body resonance of the 506b of lower floor is because the resonance of the elasticity of the 506b of lower floor improves high frequency sound-absorbing power.The 506b of lower floor can utilize the Masu of the 506b of lower floor to promote soundproof effect with non-aeration resonant layer 503.

Embodiment 5-1

Embodiment 5-1 as shown in figure 20, the per unit area weight of epidermis/spacer layer 507 is 350g/m ²The Buddhist nun's thickness that contracts of upper strata 506a is 5～15mm, the hard cloth sheet thickness of the 506b of lower floor is 2～5mm, and rete 503 is 300 μ, and the material of bonding coat 504 is alkene hydroxyl (Olefine) class cementing agent, the Buddhist nun's layer 502 of contracting is the blending of hot plastic tygon, acryl, cotton fiber etc. the Buddhist nun that contracts, thickness is 10mm, and fluffy material 509 is the granule foaming product of PP or PE class, or the compression molded product of RSP P, thickness is 5～50mm, is the die casting product.The hard cloth lamella per unit area weight of peritonaeum is 350g/m ²

Figure 21 (a) is depicted as the structure of the car bottom panel 510a of comparison diagram 1.Car bottom panel 510a is constituted by epidermis/spacer layer 507d, hard cloth lamella 506e, Buddhist nun's layer 503f that contract, fluffy material 509a from top to down in regular turn.Epidermis/spacer layer 507d and hard cloth lamella 506e with and the normally bonding incorporate goods in advance of Buddhist nun's layer 503f that contract, the meeting of vehicle assembling is sometimes changed the 509a layer separately.In this structure,, but possesses the effect in the compartment hardly though spacer layer 507d has the soundproof effect of car external noise.

I am structure for the floor silencing apparatus 501b that uses comparative example 2 Figure 28 for Figure 21 (b).The structure of floor silencing apparatus 501b from top to bottom is sound-absorbing epidermis/PE spacer layer 507g, hard cloth lamella 506h, Buddhist nun's layer 503I that contract, fluffy material 509b in regular turn.Figure 21 (c) is depicted as the instantiation structure of the floor silencing apparatus 501 ' of embodiment 5.Under this structure, can control the throughput of hard cloth sheet, can guarantee sound-absorbing effect in the compartment, and but guarantee the noise isolation effect outside the compartment.But owing to possess aeration, soundproof effect can be poor.The structure of floor silencing apparatus 501 ' is epidermis/spacer layer 507 ', hard cloth lamella 506 ', rete (non-ventilation resonant layer) 503 ', bonding coat 504 ', the Buddhist nun's layer 502 ' that contracts, fluffy material 509 ' from top to bottom in regular turn.Hard cloth lamella 506 ' almost adopts bonding comprehensively with rete (non-ventilation resonant layer) 503 '.This structure can be guaranteed sound-absorbing effect in the compartment, and but guarantees the noise isolation effect outside the compartment, and owing to can further utilize elasticity resonance and rigid body resonance, therefore can guarantee the good sound absorption rate and reach better soundproof effect by non-aeration film.

Shown in Figure 22 (a), the transmission loss of embodiment 5 is also higher than comparative example 1,2.Especially higher with respect to comparative example 2.Shown in Figure 22 (b), the acoustic absorptivity of concrete example also improves than comparative example 1,2.Especially contrast in comparative example 1 and more improve.This all is because the effect of rete 503 is brought.

Embodiment 5 is as being changed, Buddhist nun's the upper strata 506a of for example contracting among Figure 20 adopts non-air ventilation membrane (thickness 30～400 μ have aperture, be preferably 200 μ, material is alkene hydroxyl (Olefine) resinoid classes such as PE, PP), the hard cloth sheet 506b of lower floor adopts the Buddhist nun's structure that contracts.Upper strata 506a adopts pin seam mode to engage with the 506b of lower floor.The difference on effect that has or not apertured film as Figure 23 (a) (b) shown in.Air ventilation membrane can be strengthened transmission loss and acoustic absorptivity.Figure 23 (a) is a transmission loss, and the numerical value of the transmission loss of the iron plate of 0.8mm when 0dB as shown in the figure.

Embodiment 5-2

Embodiment 5-2 system adopts epidermis/spacer layer 507, and per unit area weight is 350g/m ²Upper strata 506a is non-air ventilation membrane, thickness 200 μ, hard cloth lamella 506 (thermoplasticity contract Buddhist nun's compression molded product, thickness 5mm), rete 503 (PE class film, thickness 300 μ), bonding coat 504 (alkene hydroxyl (Olefine) class bonding agent), the Buddhist nun's layer 502 that contracts (mainly be with the thermoplasticity that dacron is made contract Buddhist nun) thickness 10mm, the thickness of fluffy material 509 (PP granule foaming die casting product) is 5～40mm.The per unit area weight of the hard cloth lamella 506 of membrane is 350g/m ²

Shown in Figure 24 is the floor silencing apparatus 601 of embodiment 6.Its structure is roughly the same with the floor silencing apparatus 501 of embodiment 5, and having only sound absorbing layer 602 is to constitute this point difference by high density sound absorbing layer 602a, low density acoustic layer 602b.Because its physical property has part identical with the instrument panel silencing apparatus 301 of embodiment 3, therefore continues to use the preceding paragraph explanation.What physical property was more different is, the thickness of high density sound absorbing layer 602a is 2mm～70mm, the thickness of low sound absorbing layer 602b is in 2～70mm scope, the initial stage compression bounce-back example of high density sound absorbing layer 602a is 30～600N, be preferably 50～300N, the initial stage compression bounce of low density acoustic layer 602b is 5～300N, is preferably 10～100N.

Embodiment 6

The structure of embodiment 6 in the sound absorbing layer of embodiment 5-1 is made of high density sound absorbing layer and low density acoustic layer.The density of high density sound absorbing layer 602a is 0.100g/cm ³, thickness is 10mm, per unit area weight is 1000g/m ², initial stage compression bounce 300N adopts thermoplasticity Buddhist nun's (as intermixture, making the Buddhist nun that contracts with anti-hair of chemical fibre and PE fiber with PET) material that contracts; The density of low density acoustic layer 602b is 0.04g/cm ³, thickness is 10mm, per unit area weight is 400g/m ², initial stage compression bounce 1300N, material is the cotton fiber Buddhist nun that contracts.The adhesion of following layer 604 is 5N/25mm.The Buddhist nun that contracts is laminated in pin seam mode the PET class that also can adopt high density sound absorbing layer 602a and low density acoustic layer 602b.

About the venting quality aspect, adopt " the Fragil type testing machine " of a JIS L10188.3.3.1 piece of writing and therewith the result concern that high aeration testing machine measures.

The mensuration of transmission loss is the regulation according to JIS A 1409, and the area of test body is not 10m ², but 1m ²Figure 25 is the planimetric map of measuring cell, disposes loudspeaker 20 and microphone 31～36, and the test body of instrument panel silencing apparatus 1 grade is configured on the wall in each room.

The mensuration system of acoustic absorptivity carries out according to JIS A 1416 (reverberation chamber sound-absorbing), and the area of test body is not 10m ², but 1m ²Figure 26 is the planimetric map of measuring cell, disposes loudspeaker 40 and microphone 51～53, disposes the test body of instrument panel silencing apparatus 1 grade on the floor of measuring cell.

The present invention is not limited to the above embodiments, as long as in technical scope of the present invention, can take various examples.In not exceeding technical conceive scope of the present invention, but also change, and these changes, equipollent all are encompassed in the technical scope of the present invention.

Claims (20)

1. Ultralight sound insulator comprises:

Thickness is 1～100mm, density 0.01～0.2g/cm ³The light weight sound absorbing layer and,

See through the non-aeration resonant layer that bonding coat engages with this sound absorbing layer, the per unit area weight of described non-aeration resonant layer is at 600g/m ²Below, aforementioned non-aeration resonant layer be configured to foaming body or film body, as be aforesaid foaming body, thickness is 1～7mm, as is aforesaid film body, thickness is 10～600 μ m;

For aforesaid sound absorbing layer and aforementioned non-aeration resonant layer, the bond strength of aforementioned adhesion layer is 1～20N/25mm under the peeling off of strips off amplitude 25mm, 180 degree; For aforementioned adhesion layer all interface, bonding with 50～100% area to aforementioned sound absorbing layer and aforementioned non-aeration resonant layer;

And aforementioned sound absorbing layer is configured in the body panel side, and aforementioned non-aeration resonant layer is arranged at the inboard, compartment;

Wherein, described sound absorbing layer is that the polylayer forest by high density sound absorbing layer and low density acoustic layer is constituted, and the density of described high density sound absorbing layer is 0.05～0.20g/cm ³, the density of described low density acoustic layer is 0.01～0.10g/cm ³

2. Ultralight sound insulator as claimed in claim 1, wherein, the thickness of described high density sound absorbing layer is 2～70mm, the thickness of described low density acoustic layer is 2～70mm.

3. Ultralight sound insulator as claimed in claim 1 or 2, wherein, the initial stage compression bounce of described high density sound absorbing layer is 30～600N, the initial stage compression bounce of described low density acoustic layer is 5～300N, the initial stage compression bounce of aforementioned high density sound absorbing layer is at least 1.2～40 times of aforementioned low density acoustic layer, in the thickness of aforementioned sound absorbing layer, the shared thickness of high density sound absorbing layer is 20～80%.

4. Ultralight sound insulator as claimed in claim 1, wherein, described sound absorbing layer is an individual layer, density 0.02～0.20g/cm ³, thickness 2～70mm.

5. Ultralight sound insulator as claimed in claim 4, wherein, the initial stage of described sound absorbing layer compression bounce is 2～200N.

6. as each described Ultralight sound insulator in the claim 1,2,4 or 5, wherein, described non-aeration resonant layer engages with the 2nd sound absorbing layer on the compartment medial surface, and the density of aforementioned the 2nd sound absorbing layer is 0.01～0.2g/cm ³, thickness is 1～20mm.

7. Ultralight sound insulator as claimed in claim 6, wherein, aforementioned the 2nd sound absorbing layer is a single or multiple lift.

8. Ultralight sound insulator as claimed in claim 7, wherein, aforementioned the 2nd sound absorbing layer is a multilayer, its lower floor and resonant layer are bonding, or upper strata and lower floor form so that mechanical perforation power is overlapping.

9. Ultralight sound insulator as claimed in claim 1, wherein, the density of described light weight sound absorbing layer is 0.03～0.08g/cm ³

10. Ultralight sound insulator as claimed in claim 1, wherein, the per unit area weight of described non-aeration resonant layer is at 300g/m ²Below.

11. Ultralight sound insulator as claimed in claim 1, wherein, described non-aeration resonant layer is as being aforesaid foaming body, and thickness is 2～3mm, as is aforesaid film body, and thickness is 20～300 μ m.

12. Ultralight sound insulator as claimed in claim 1, wherein, the bond strength of described bonding coat is 3～10N/25mm under the peeling off of strips off amplitude 25mm, 180 degree.

13. Ultralight sound insulator as claimed in claim 1 is wherein, for aforementioned adhesion layer all interface to aforementioned sound absorbing layer and aforementioned non-aeration resonant layer, bonding with 80%～100% area.

14. Ultralight sound insulator as claimed in claim 3, wherein, the initial stage of described high density sound absorbing layer compression bounce is 50～300N.

15. Ultralight sound insulator as claimed in claim 3, wherein, the initial stage of described low density acoustic layer compression bounce is 10～100N.

16. Ultralight sound insulator as claimed in claim 3, wherein, the initial stage of aforementioned high density sound absorbing layer compression bounce is at least 1.5～5 times of aforementioned low density acoustic layer, and in the thickness of aforementioned sound absorbing layer, the shared thickness of high density sound absorbing layer is 40%～60%.

17. Ultralight sound insulator as claimed in claim 5, wherein, the initial stage of described sound absorbing layer compression bounce is 20～100N.

18. Ultralight sound insulator as claimed in claim 6, wherein, the density of aforementioned the 2nd sound absorbing layer is 0.05～0.15g/cm ³, thickness is 4～10mm.

19. Ultralight sound insulator as claimed in claim 3, wherein, described non-aeration resonant layer engages with the 2nd sound absorbing layer on the compartment medial surface, and the density of aforementioned the 2nd sound absorbing layer is 0.01～0.2g/cm ³, thickness is 1～20mm.

20. as the Ultralight sound insulator of claim 19, wherein, the density of aforementioned the 2nd sound absorbing layer is 0.05～0.15g/cm ³, thickness is 4～10mm.

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