JP2014211640A - Acoustic isolation panel member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic isolation panel which exhibits excellent sound absorbing performance by a buffer at a sound absorption material, can exhibit the sound absorption performance to a wide-band frequency since a degree of freedom of design is high, and can be attached to a variety of points.SOLUTION: An acoustic isolation panel 1 comprises: an open-type thermoplastic resin-made panel material 2 in which a plurality of opened hollow chambers 13 are defined and formed; and a sound absorption material 3 which is formed by laminating a fiber sheet on a single face or both faces of a paper material sheet containing a porous pulp fiber at 90 mass% or higher in a range of 350 to 650 ml at Canadian standard freeness (CSF) whose beating degree is stipulated in the 4. Canadian standard freeness of JIS P 8121-1995, and whose ventilation resistance is set within a range of 0.2 to 10.0 kPa s/m. The sound absorption material 3 is applied and laminated on releasing ports 13A of the hollow chambers 13 of the panel material 2.

Description

  The present invention is, for example, an undercover, an engine cover, an interior panel, etc. for automobiles, an outer panel, etc., for devices that can be a source of noise such as refrigerators, washing machines, air conditioners, etc. The present invention relates to a sound-absorbing and sound-insulating panel member used for a sound-proofing material such as a sound-proofing wall or a sound-proofing floor, such as a sound-proofing material buried under a road surface or a sound-proofing wall standing on the side edge of a road.

Conventionally, as the sound absorbing and insulating panel member as described above, for example, a sound absorbing floor shown in Patent Document 1 is cited. In the sound absorbing floor, the opening of the foamed plastic in which blind holes are formed is covered with a sound absorbing sheet to form a Helmholtz resonator.
Here, the blind hole is formed during foam molding of the foamed plastic by providing a large number of needle-like protrusions in the foam mold. The sound absorbing sheet includes various resin foams such as cloth, nonwoven fabric, resin felt, thermoplastic felt, needle felt, and polyurethane.

JP 2004-338504 A

However, in the case of the above conventional sound absorbing floor, a sound absorbing sheet is laminated on foamed plastic to form a Helmholtz resonator, but the Helmholtz resonator exhibits excellent sound absorbing performance for sound of a specific frequency, Except for sound of a specific frequency, sound absorption performance can hardly be exhibited. For example, in the sound absorption floor of Patent Document 1, the sound absorption rate at 1600 Hz is high (see the graph of FIG. 4), but the sound absorption rate is drastically reduced except for this peak, particularly at 2000 Hz or more (note that the engine of a car, etc. The frequency of the noise generated from the noise source is 1000 to 5000 Hz). Further, since the foamed plastic used for the sound absorbing floor is hardly expected to have sound absorbing performance, there is a problem that noise that cannot be exhibited by the Helmholtz resonator leaks into the vehicle without being absorbed.
In addition, in the case of the above conventional sound-absorbing floor, the foamed plastic formed with foamed beads is easily chipped or broken, and it is easy to decrease the strength by providing blind holes, so that it is thick (patent In each example of Document 1, it is 30 mm), and the sound absorbing sheet is also thick (20 mm in Example 1 of Patent Document 1). In particular, there was a problem that it was difficult to install in a narrow space.
The present invention has been made paying attention to such problems existing in the prior art. An object of the invention is to provide a sound absorbing and insulating panel member that can exhibit sound absorbing performance with respect to a wide band of frequencies and can be attached to various locations.

  In order to achieve the above object, the invention of the sound absorbing and insulating panel member according to claim 1 is characterized in that an open type thermoplastic resin panel material in which a plurality of open hollow chambers are defined, and a beating degree. JIS P 8121-19954. It is made by laminating a fiber sheet on one or both sides of a paper sheet containing 90% by mass or more of a porous pulp fiber with a Canadian standard freeness prescribed in Canadian Standard Freeness in the range of 350 to 650 ml (CSF). A sound-absorbing material having a ventilation resistance set in the range of 0.2 to 10.0 kPa · s / m, and the sound-absorbing material is coated and laminated at the opening of the hollow chamber of the panel material. It is a summary.

[Action]
According to the sound absorbing and insulating panel member of the above invention, the panel material is formed with a plurality of open hollow chambers.
That is, the sound generated from the noise source is buffered and attenuated by vibrating the porous pulp fiber of the paper sheet when passing through the sound absorbing material. Since the porous pulp fiber has a large number of pores that open on the fiber surface, the fiber itself has air permeability and air retention, and also has a large number of fluff on the fiber surface. ing. Such a paper sheet made of fibers containing 90% by mass or more of porous pulp fibers having air permeability and air retainability is given air permeability and air retainability also by the space formed between the fibers. Exhibits extremely high sound absorption performance.
The sound that has passed through the sound absorbing material enters the hollow chamber through the opening of the hollow chamber of the panel material, but is sent back to the opening of the hollow chamber by being reflected by the inner surface of the hollow chamber. The sound entering the hollow chamber cancels each other out, or enters the sound absorbing material again from the opening and is attenuated by the paper sheet.
Therefore, the sound absorbing and insulating panel member of the present invention has a wide band by performing attenuation by sound absorbing material including a paper sheet, re-attenuation by being sent back from the hollow chamber to the sound absorbing material, and sound absorption utilizing cancellation of sounds. Sound absorption performance can be demonstrated with respect to frequency.

Further, the porous pulp fiber having a large number of pores opened on the fiber surface as described above has a beating degree of 350 to 650 ml (CSF) suitable for exhibiting sound absorption performance by buffering (hereinafter referred to as buffer sound absorption performance). It is obtained by beating the pulp fiber so that Beating means that the pulp fibers are mechanically beaten or ground, but the beaten pulp fibers are fluffed due to friction and fluffing occurs, and fine air grooves (pores) are formed on the fiber surface. ) Expands to become porous. The sound absorbing material is formed by laminating a fiber sheet on one or both sides of a paper material sheet. The fiber sheet is provided mainly for the purpose of reinforcing the paper material sheet. Since the main purpose is not to exhibit sound absorbing performance, there is no need to increase the thickness of the fiber sheet, and the sound absorbing material is a ventilation resistance suitable for exhibiting buffer sound absorbing performance. Since it is set in the range of 0.0 kPa · s / m, the sound absorbing material can be made thin.
Therefore, even if the sound absorbing material is thin, it exhibits extremely high shock absorbing performance, and it is not necessary to give the panel material a particularly thick thickness. It can be attached to.

〔effect〕
The sound-absorbing and insulating panel member of the present invention exhibits excellent sound-absorbing performance due to buffering with the sound-absorbing material, and since it has a high degree of design freedom, it can exhibit sound-absorbing performance for a wide band of frequencies, It can be attached to the place.

Sectional drawing of the sound-absorption sound insulation panel member of embodiment. The perspective view which shows the base body of the panel material of embodiment. Schematic explaining the measuring method of ventilation resistance. Sectional drawing of the sound-absorption sound-insulation panel member of the 1st modification. Sectional drawing of the sound-absorption sound-insulation panel member of the 2nd modification. The perspective view which shows the base body of a panel material in the other modification. The perspective view which shows an open type panel material in the other modification. The graph which showed the sound absorption rate with respect to each frequency of an Example and a comparative example.

Embodiments of the sound absorbing and insulating panel member of the present invention will be described in detail below.
As shown in FIG. 1, the sound absorbing and insulating panel member 1 is composed of a panel material 2 and a sound absorbing material 3 laminated on the panel material 2.
The sound absorbing and insulating panel member 1 is used as a cover panel that covers a noise source or an outer panel that surrounds the noise source. And it arrange | positions so that the sound-absorbing material 3 side may face the noise source side.
Examples of the use object of the sound absorbing and insulating panel member 1 include vehicles, home appliances or electrical appliances, articles related to the civil engineering field or the building field.
The vehicle mainly includes a vehicle such as a passenger car, a bus, a ship, and an airplane. In particular, in the case of a vehicle, the sound absorbing and insulating panel member 1 includes an under cover on the bottom of the vehicle, an engine cover, a motor cover, and an inverter in the engine compartment. Various cover members such as covers, roof materials, door materials, various panel members such as floor panels, console panels, center consoles, dashboards, etc., fender liners, etc. are used.
If it is this household appliance or electrical appliance, this sound absorption and insulation panel member 1 is used as an exterior panel of an air conditioner, a refrigerator, a washing machine or a personal computer.
If it is an article related to the civil engineering field or the building field, the sound absorbing and insulating panel member 1 is used as a soundproof wall such as a road, a tunnel or a railroad track, or as a soundproof wall such as a house, an apartment house or a reinforcing bar building. used.
The noise that is absorbed by the sound absorbing and insulating panel member 1 includes engine noise, road noise, compressor noise, motor noise, fan noise, and human speech.

[Panel material]
As shown in FIG.1 and FIG.2, the panel material 2 of this embodiment forms the some wall part 12 which consists of a protruding item | line on the single side | surface of the board | substrate part 11 which makes flat form. The panel member 2 is surrounded by the side surfaces of the pair of wall portions 12 and the inner surface of the substrate portion 11 existing between the pair of wall portions 12, thereby defining a plurality of hollow chambers 13. Yes. And the upper surface of this hollow chamber 13 is open | released, and it is set as the open port 13A.
In FIG. 2, the end of the panel material 2 (the end on the near side in the figure) is opened to make the inside of the panel material 2 easier to understand. It is blocked by covering with a sheet material or joining a sheet material.

  In this specification, “open panel material” means that one of the surfaces defining the hollow chamber 13 is open to the outside, and the entire open surface is open. The panel material having the opening 13A is shown. As a specific example, the panel material 2 having the opening 13A between the upper ends of the pair of wall portions 12 shown in FIG. 2, or the panel material having the structure shown in FIG. 2 is mentioned.

  The frequency of the noise targeted by the panel material 2 is set based on the balance with the frequency of the noise targeted by the sound absorbing material 3. That is, in the sound absorbing and insulating panel member 1 of this embodiment, the sound absorbing performance is improved by complementing the sound absorbing object that the panel material 2 and the sound absorbing material 3 are not good at each other.

The weight of the panel material 2 is desirably in the range of 500 to 3000 g / m ^{2 when} expressed in terms of mass per unit area because the panel material 2 is hollow. When the mass per unit area is less than 500 g / m ² , the panel material is likely to vibrate due to noise, and the panel material becomes a noise source, or the strength of the panel material is reduced and easily damaged. To do. When the mass per unit area exceeds 3000 g / m ² , it is difficult to reduce the weight of the sound absorbing and insulating panel member 1.
The thickness of the panel material 2 is preferably in the range of 2.0 to 15.0 mm from the viewpoint of being able to be attached to various objects of use and satisfying a predetermined strength. If the thickness is less than 2.0 mm, the predetermined strength may not be satisfied. If the thickness exceeds 15.0 mm, it may not be possible to attach depending on the use object, and the use object is limited. There is a risk of becoming.

The panel material 2 is formed by a method such as injection molding, extrusion molding, vacuum molding, or pressure molding using a thermoplastic resin as a material.
As the thermoplastic resin, any material that can be used in injection molding may be used. Specific examples include polyolefins such as polyethylene (PE) and polypropylene (PP), polyesters such as polyethylene terephthalate (PET), engineering plastics such as polyamide (PA), polyacetal (POM), and polycarbonate (PC), polytetrafluoroethylene. (PTFE) and other fluororesins, polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), or poly from starches such as corn and sugarcane Examples include biodegradable resins made from lactic acid.
The thermoplastic resins may be used alone or in combination of two or more. Furthermore, an inorganic filler may be added to the thermoplastic resin to improve mechanical strength and heat resistance, and a fibrous filler may be added to improve shape retention, dimensional stability, compression and tensile strength, etc. It may be improved.

[Sound absorbing material]
The sound absorbing material 3 of the present embodiment is configured by laminating fiber sheets on both sides of a paper material sheet. Specifically, the sound absorbing material 3 is laminated on one surface of the first sound absorbing layer 21 and the first sound absorbing layer 21 made of a paper material sheet. It is comprised by the 2nd sound absorption layer 22 consisting of a fiber sheet, and the skin layer 23 consisting of the fiber sheet laminated | stacked on the other surface of this 1st sound absorption layer 21 (refer FIG. 1). In addition, a breathable adhesive layer (between the first sound absorbing layer 21 and the second sound absorbing layer 22 and between the first sound absorbing layer 21 and the skin layer 23 so that noise can pass through each layer without being hindered. (Not shown).
The sound absorbing material 3 exhibits a buffer sound absorbing performance by vibrating fibers contained in each layer, particularly porous pulp fibers of a paper material sheet, when the noise passes through the sound absorbing material 3 with respect to noise. Can do.
The thickness of the sound absorbing material 3 is preferably in the range of 0.2 to 20.0 mm from the viewpoint of being able to be attached to various objects of use and satisfying a predetermined strength. If the thickness is less than 0.2 mm, the sound absorbing material 3 may be easily broken and may not satisfy the predetermined strength. If the thickness exceeds 20.0 mm, it may not be attached depending on the object of use. There is a possibility that the target of use will be limited.
The air-permeable adhesive layer is, for example, a hot melt adhesive powder spread, a spider web-like hot melt adhesive layer interposed, a solution or aqueous emulsion spray coating, a point application by silk printing or offset printing, or the like. It is formed by a linear coating method or the like.

[Paper sheet]
The paper sheet of the first sound absorbing layer 21 is a main member for the sound absorbing material 3 to exhibit a buffer sound absorbing performance, and is composed of only porous pulp fibers or porous pulp fibers and normal fibers (non-porous). Made of mixed fiber). When using mixed fibers for the paper sheet, the mixing ratio of the porous pulp fibers in the mixed fibers is 90% by mass or more from the viewpoint of making the sound absorbing and insulating panel member 1 lightweight and exhibiting excellent buffer sound absorbing performance. It is desirably 95% by mass or more.
And this paper material sheet is obtained by applying methods, such as a papermaking method and a needle punching method, to porous pulp fiber or mixed fiber.

The mass per unit area (weight per unit area) of the paper sheet is preferably 10 to 50 g / m ² from the viewpoint of satisfying the required strength while maintaining the required air permeability. When the basis weight is less than 10 g / m ² , the strength of the paper material sheet is lowered, and the paper material sheet is easily torn during molding. When the weight per unit area exceeds 50 g / m ² , the air permeability decreases and the buffer sound absorption performance deteriorates, and the moldability decreases and wrinkles easily occur.

  Specific examples of the paper sheet include flat paper having no wrinkles or irregularities on the surface, creped paper having crimped wrinkles formed on the surface, embossed paper having many irregularities formed on the surface, wrinkles on the surface. And crepe embossed paper on which both of the protrusions and recesses are formed. Among these, creped paper and crepe-embossed paper are desirable from the viewpoint of excellent buffer sound-absorbing performance and excellent formability due to excellent stretchability.

(Porous pulp fiber)
The porous pulp fiber is made of non-wood plant fiber and / or wood plant fiber, and is made of softwood or hardwood chips, and the beating degree is JIS P 8121-1995. Canadian standard freeness specified by Canadian Standard Freeness and having a range of 350 to 650 ml (CSF).
The beating is performed by a conical refiner, a disc refiner, or the like. When the beating degree of the pulp fiber exceeds 650 ml (CSF), the pulp fiber is not sufficiently crushed or concentrically loosened, and the porous structure due to the large number of pores opening on the surface of the pulp fiber becomes insufficient. The porosity is reduced, and the sound absorbing performance of the sound absorbing material 3 is adversely affected. On the other hand, if it is less than 350 ml (CSF), the pulp fibers are fibrillated and fragmented, and the number of fine fibers increases. Therefore, the density of the paper sheet made of such pulp fibers increases, and the sound absorbing properties of the sound absorbing material 3 are adversely affected. It is.

(Normal fiber)
Examples of the normal fibers (nonporous pulp fibers) include, for example, polyester fibers, polyethylene fibers, polypropylene fibers, polyamide fibers, acrylic fibers, urethane fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, and organic synthetic fibers such as acetate fibers, Biodegradable fiber (polylactic acid fiber) made of starch extracted from plants such as corn and sugarcane, natural fiber such as pulp, cotton, palm fiber, hemp fiber, bamboo fiber, kenaf fiber, glass fiber, carbon fiber, ceramic fiber Inorganic fibers such as asbestos fibers, or one type or two or more types of recycled fibers obtained by defibrating scraps of fiber products using these fibers are used. Desirable fibers include recycled polyester fibers regenerated from polyester product waste such as PET bottles.

[Fiber sheet]
The original purpose of the fiber sheet is to reinforce the paper material sheet. In the present embodiment, the second sound absorbing layer 22 and the skin layer are not only used to reinforce the paper material sheet but also to improve the buffer sound absorbing performance. Two fiber sheets having different thicknesses of 23 are laminated on both sides of the paper sheet. Accordingly, if the purpose is only to reinforce the paper sheet, either the second sound absorbing layer 22 or the skin layer 23 may be omitted.
As the fiber sheet, a breathable material such as a nonwoven fabric made of a fiber material or a fiber knitted fabric is used.
As the fiber material, those mentioned for the normal fiber of the paper sheet can be used, and in addition, for example, a melting point such as ceramic fiber, asbestos fiber, stainless steel fiber or aramid fiber is 250 ° C. or more. If a thing is used, heat resistance can also be provided.
The mass per unit area (weight per unit area) of the fiber sheet is preferably in the range of 15 to 1000 g / m ² . The density of the fiber sheet is preferably in the range of 5 to 300 kg / m ³ . When the mass per unit area is less than 15 g / m ² or the density is less than 5 kg / m ³ , the paper material sheet may not be properly reinforced. When the mass per unit area is 1000 g / m ² or the density exceeds 300 kg / m ³ , there is a risk that noise cannot sufficiently pass through the fiber sheet and the paper material sheet cannot sufficiently exhibit the buffer sound absorbing performance. There is.

[Apply or impregnate synthetic resin]
At least one of the paper material sheet and the fiber sheet may be coated and / or impregnated with a synthetic resin or the like for the purpose of imparting rigidity or formability or adjusting the air flow resistance. You may mix a synthetic resin etc. at the time of manufacture of a sheet | seat. Examples of the synthetic resin include an existing thermoplastic resin and / or an existing thermosetting resin.

[Ventilation resistance]
The airflow resistance R (Pa · s / m) is a scale representing the degree of airflow of the air-permeable material. The measurement of the ventilation resistance R is performed by a steady flow differential pressure measurement method. As shown in FIG. 3, the test piece T is arranged in the cylindrical air passage W, and the pressure in the air passage W on the start point side of the arrow in the figure in a state of a constant air flow V (the direction of the arrow in the figure). By measuring the pressure difference between P1 and the end point P2 of the arrow in the figure, the ventilation resistance R can be obtained from the following equation.
R = ΔP / V
Here, ΔP (= P1−P2): Pressure difference (Pa), V: Air flow rate per unit area (m ³ / m ² · s). The ventilation resistance R (Pa · s / m) is in a relationship of air permeability C (m / Pa · s) and C = 1 / R.
The ventilation resistance can be measured by, for example, an air permeability tester (product name: KES-F8-AP1, manufactured by Kato Tech Co., Ltd., steady flow differential pressure measurement method).

The ventilation resistance of the sound absorbing material 3 is set to 0.2 to 10.0 kPa · s / m. When the ventilation resistance is less than 0.2 kPa · s / m, the sound absorbing material 3 cannot exhibit sufficient buffer sound absorbing performance against noise. When the airflow resistance exceeds 10.0 kPa · s / m, the noise is increased by reflecting the noise absorbing material 3 without entering the sound absorbing material 3.
The airflow resistance of the paper sheet may be appropriately set so that the airflow resistance when the fiber sheet is laminated to obtain the sound absorbing material 3 is in the range of 0.2 to 10.0 kPa · s / m. Is in the range of 0.07 to 8.00 kPa · s / m. When the ventilation resistance of the paper sheet is less than 0.07 kPa · s / m, the ventilation resistance of the sound-absorbing material 3 may not be less than 0.2 kPa · s / m, and exceeds 8.00 kPa · s / m. There is a possibility that the ventilation resistance of the sound absorbing material 3 may exceed 10.0 kPa · s / m.
In addition, adjustment of this ventilation resistance can be adjusted with the entanglement of fibers, a fabric weight, and a density, and it can adjust with the application quantity or impregnation quantity of a synthetic resin besides these.

[Sound-absorbing sound insulation panel members]
The sound absorbing and insulating panel member 1 is composed of the second sound absorbing layer 22 and the first sound absorbing layer 21 so that the sound absorbing material 3 covers the opening 13A of the hollow chamber 13 of the panel material 2. It is obtained by laminating so as to be on the panel material 2 side. The sound absorbing and insulating panel member 1 is installed and fixed so that the sound absorbing material 3 faces the noise source. The noise generated by the noise source is attenuated by the buffer sound absorbing performance when passing through the sound absorbing material 3, reaches the panel material 2, and is further absorbed by the panel material 2 exhibiting the resonance sound absorbing performance.
The panel material 2 and the sound absorbing material 3 may be bonded using an adhesive or the like, or may be bonded using pins, screws, nails, or the like used to fix the sound absorbing and insulating panel member 1 to an attachment target. May be.

[High-density fiber sheet]
For the purpose of improving the sound insulation performance, a damping material made of a high-density fiber sheet is laminated on one surface of the base plate portion 11 (the surface on which the wall portion 12 is formed) on the base body 2A of the panel material 2. Also good. The damping material may be laminated so as to avoid the concave portion 13 or may be laminated so as to be filled in the concave portion 13.
The damping material suppresses the generation of noise due to the co-vibration of the panel material 2 by suppressing the co-vibration of the panel material 2 due to sound waves from a noise source.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and may be modified as shown below, for example.
[First modification]
As shown in FIG. 4, the panel material 2 uses the open panel material 2 of the above embodiment, and the sound absorbing material 3 is configured by omitting the second sound absorbing layer 22 made of a porous base material. May be used.

[Second modification]
As shown in FIG. 5, the panel member 2 uses the open-type panel member 2 of the above-described embodiment, and the sound absorbing member 3 has a skin layer 23 made of a fiber sheet on both sides of a sound absorbing layer 21 made of a paper material sheet. You may use what was laminated | stacked.

[Other changes]
As shown in FIG. 6, as the base body 2A of the panel material 2, a wall body 12 having a cylindrical shape is used, and the base body 2A and the cover plate 2B constitute an open panel material. Also good.
As shown in FIG. 7, the wall portion 12 may be formed into a hollow inverted truncated cone shape, and the upper end opening of the wall portion 12 may be used as the opening 13 </ b> A, so that an open panel material may be configured only by the base body 2 </ b> A. . In addition, about the wall part 12 made into reverse cone shape, when a sound enters into the hollow chamber 13 which will be formed inside this wall part 12, the sound reflected by the inner surface of this hollow chamber 13 is an open port. Since the light is focused on 13A (Monroe effect), the sound absorption performance can be improved.

  Examples for describing the present invention more specifically will be described below, but the present invention is not limited to these examples.

[Example 1]
A: Panel material Panel material 2 shown in FIG. 6, that is, an open panel material, was obtained using a thermoplastic resin composed of a mixture of 90% by mass of polypropylene and 10% by mass of low-density polyethylene.
The panel material 2 had a wall 12 thickness of 5 mm and an opening diameter of the opening 13 </ b> A of 3 mm.
B: Sound absorbing material Pulp fiber composed of 50% by weight of softwood pulp and 50% by weight of hardwood pulp is beaten with 400 ml (CSF), paper weight: 30 g / m ² , air flow resistance: 0.913 kPa · s / m paper A material sheet was obtained.
A polyester sheet was used to obtain a fiber sheet made of felt having a basis weight of 150 g / m ² and a thickness of 10 mm and an ultrathin fiber sheet having a basis weight of 30 g / m ² by a spunbond method.
A sound absorbing material 3 was obtained by adhering a fiber sheet made of felt to one surface of the paper material sheet to form the second sound absorbing layer 22 and adhering an ultrathin fiber sheet to the other surface to form the skin layer 23. The adhesion was performed by applying and heating a polyamide hot melt adhesive (particle size: 300 to 500 μm) at an application amount of 5 g / m ² per side.
The sound absorbing material 3 had an overall basis weight of 220 g / m ² , a thickness of 10 mm, and a ventilation resistance of 1.250 kPa · s / m.
C: Sound-absorbing and insulating panel member The sound-absorbing material 3 obtained in B is applied to one side of the panel material 2 obtained in A (the surface provided with the opening 13A and the upper surface in FIG. 4). A sample of Example 2 was obtained by laminating 22 so as to cover the open port 13A with the sound absorbing material 3 and 22 on the panel material 2 side. The adhesion was performed by applying an olefin-based hot melt adhesive (melting point: 130 ° C.) in the form of dots at intervals of 5 cm.

[Comparative Example 1]
A sample was obtained in the same manner as in Example 1 except as described below.
B: Sound-absorbing material Polyester fiber is used as a sound-absorbing material by using a fiber sheet made of felt having a basis weight of 1800 g / m ² , a thickness of 10 mm, and a ventilation resistance of 0.907 kPa · s / m by a spunbond method. The sample of Comparative Example 4 was obtained by bonding to one side of No. 2.

〔Test results〕
The sound absorption coefficient of each sample of Example 1 and Comparative Example 1 was measured. The results are shown in Table 1 and the graph of FIG.
In addition, the measurement of the sound absorption rate was performed according to the measurement method of the reverberation chamber method sound absorption rate of JIS A 1409.

As shown in Table 1 and FIG. 8, Example 1 generally shows a high sound absorption rate for sound having a frequency of 1000 Hz or higher, and does not significantly reduce the sound absorption rate at a specific frequency. It was confirmed to be excellent.
In Comparative Example 1, a sound absorbing material having the same thickness as Example 1 but not including a paper sheet was used. However, it was confirmed that the sound absorbing rate was generally very low as compared with Example 1.
In Comparative Example 2, a sound absorbing material having the same airflow resistance as Example 1 but not including a paper material sheet was used, but it was confirmed that the sound absorbing rate was generally lower than that of Example 1.
Comparative Example 3 is composed only of a panel material, and exhibits a sound absorption performance specific to the Helmholtz resonator, that is, an excellent sound absorption rate for a sound of a specific frequency (here, 1600 Hz). It was confirmed that the sound absorbing performance could not be exhibited at all except for the sound of the frequency.
Example 2 is an open-type panel material, but the sound absorption rate of about 1600 Hz is inferior to that of Example 1 in which a Helmholtz resonator is configured by using a panel material as a closed type, but a sound of 2000 Hz or higher is used. It was confirmed that the sound absorption rate with respect to was higher than that of Example 1 and was excellent in sound absorption performance.
In Comparative Example 4, a sound absorbing material having the same thickness as that of Example 2 and not including a paper sheet having the same ventilation resistance was used, but it was confirmed that the sound absorbing rate was generally lower than that of Example 2. It was.

  The sound-absorbing and insulating panel member of the present invention is light and excellent in sound-absorbing sound-absorbing properties, and thus is extremely useful for panel materials for automobiles and the like, and can be used industrially.

DESCRIPTION OF SYMBOLS 1 Sound absorption and insulation panel member 2 Panel material 2A Base body 2B Cover plate 11 Substrate part 12 Wall part 13 Hollow chamber 14 Air hole 3 Sound absorption material 21 1st sound absorption layer 22 2nd sound absorption layer 23 Skin layer

Claims (1)

A panel material made of an open thermoplastic resin in which a plurality of open hollow chambers are partitioned;
The beating degree is JIS P 8121-1995. It is made by laminating a fiber sheet on one or both sides of a paper sheet containing 90% by mass or more of a porous pulp fiber with a Canadian standard freeness prescribed in Canadian Standard Freeness in the range of 350 to 650 ml (CSF). A sound-absorbing material having a ventilation resistance set in a range of 0.2 to 10.0 kPa · s / m;
With
The sound absorbing and insulating panel member, wherein the sound absorbing material is coated and laminated at the opening of the hollow chamber of the panel material.