JP2019031898A - Thin sound insulation sheet member and sound insulation structure using the same - Google Patents

Abstract

To provide a sound insulation sheet member that has high sound insulation performance exceeding the mass law in spite of being relatively light-weight, has the high degree of design freedom and excellent versatility, and is to be easily manufactured to enable improvement of productivity and profitability, and to provide a sound insulation structure and the like using the sound insulation sheet member.SOLUTION: A sound insulation sheet member comprises at least a sheet having rubber elasticity and a plurality of resonant parts. The resonant parts are provided in contact with a sheet surface of the sheet. The maximum height from a sheet bottom surface to tips of the resonant parts is equal to or shorter than 3 mm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sound insulation sheet member and a sound insulation structure using the same.

  In buildings such as apartment buildings, office buildings, and hotels, quietness suitable for room use is required by blocking outdoor noise from automobiles, railways, aircraft, ships, etc., and equipment noise and human voice generated inside the building. Is done. Further, in vehicles such as automobiles, railways, airplanes, ships, etc., it is necessary to reduce indoor noise in order to provide a quiet and comfortable space for passengers by blocking wind noise and engine noise. For this reason, research and development of means for blocking the propagation of noise and vibration from the outside to the inside of the vehicle or from the outside of the vehicle to the inside of the room, that is, vibration suppression and sound insulation means has been advanced. In recent years, there has been a demand for light-weight vibration-damping and sound-insulating members in buildings due to high-rise buildings and the like, and also in vehicles, light-weight vibration-damping and sound-insulating members are required to improve energy efficiency. Furthermore, in order to improve the design flexibility of buildings, vehicles, and their facilities, there is a demand for vibration damping and sound insulation members that can handle complex shapes.

  In general, the characteristics of the vibration-damping and sound-insulating material follow a so-called mass law. That is, the transmission loss, which is an index of the amount of noise reduction, is determined by the logarithm of the product of the mass of the vibration damping and sound insulating material and the frequency of the elastic wave or sound wave. Therefore, in order to further increase the amount of noise reduction at a certain frequency, the mass of the vibration damping and sound insulating material must be increased. However, in the method of increasing the mass of the vibration-damping and sound-insulating material, there is a limit to the amount of noise reduction due to the mass constraints of buildings and vehicles.

  In order to solve the problem of the mass increase of the vibration damping and sound insulating member, the member structure has been improved conventionally. For example, a method of using a combination of a plurality of rigid flat plates such as gypsum board, concrete, steel plate, glass plate, resin plate, a method of making a hollow double wall structure or a hollow triple wall structure using a gypsum board, etc. It has been known.

  In recent years, in order to realize a sound insulation performance that surpasses the mass law, a sound insulation plate using a plate-type acoustic metamaterial that uses a combination of a highly rigid flat plate material and a resonator has been proposed. Specifically, a plurality of independent stump-like protrusions (resonators) made of silicone rubber and tungsten or a plurality of independent stump-like protrusions (resonators) made of rubber are provided on an aluminum substrate. A sound insulating board (see Non-Patent Document 3) provided with a plurality of independent stump-like protrusions (resonators) made of a plate (see Non-Patent Documents 1 and 2), silicone rubber or silicone rubber and a lead cap. ) Has been proposed.

M. B. Assouar, M. Senesi, M. Oudich, M. Ruzzene and Z. Hou, Broadband plate-type acoustic metamaterial for low-frequency sound attenuation, Applied Physics Letters, 2012, volume 101, pp 173505. M. Oudich, B. Djafari-Rouhani, Y. Pennec, M. B. Assouar, and B. Bonello, Negative effective mass density of acoustic metamaterial plate decorated with low frequency resonant pillars, Journal of Applied Physics, 2014, volume 116, pp 184504. M. Oudich, Y. Li, M. B. Assouar, and Z. Hou, A sonic band gap based on the locally resonant phononic plates with stubs, New Journal of Physics, 2010, volume 12, pp 083049.

  In Non-Patent Documents 1 to 3, examination of shielding performance when the material and size of a stump-like protrusion (resonator) is changed is performed. However, there is a limit to the degree of design freedom in improving the sound insulation performance only by changing the material and size of the stump-like protrusion (resonator).

  In addition, since the sound insulating plates described in Non-Patent Documents 1 to 3 have individual resonators installed on the substrate using an adhesive, the manufacturing process is complicated and the productivity and economic efficiency are poor. It was. Moreover, the sound insulating plates described in Non-Patent Documents 1 to 3 are difficult to deform because they use a relatively rigid aluminum substrate or epoxy substrate, and are installed along a non-flat surface such as a curved surface. I can't.

  In order to solve this problem, it is also conceivable to employ an aluminum substrate or an epoxy substrate that is preliminarily curved and to install a plurality of resonators on the curved surface of these substrates. However, in this case, since it is necessary to install individual resonators on the curved surface, the difficulty of the manufacturing process is further increased, and the productivity and economy are further deteriorated. Moreover, it is not versatile to prepare a substrate corresponding to the curved shape of the installation location each time. Therefore, in expanding industrial use, there has been a demand for a sound insulation sheet member based on a new design concept, particularly from the viewpoints of design flexibility, versatility, productivity, cost, and the like.

  On the other hand, in a small electronic device, particularly a small electronic device having a microphone, motor noise in the device, switching sound in the electronic circuit, and the like have been problems. However, there has not been sufficient study to perform sound insulation with a sound insulation sheet member.

  The present invention has been made in view of such background art. Its purpose is to achieve high sound insulation performance that surpasses the mass rule while being relatively light weight, flexible, flexible in design, excellent in versatility, easy to manufacture, and capable of improving productivity and economy. An object of the present invention is to provide a sound insulation sheet member and a sound insulation structure using the same.

  Note that the present invention is not limited to the purpose described here, and is an operational effect derived from each configuration shown in the embodiment for carrying out the invention described later, and can also exhibit an operational effect that cannot be obtained by the conventional technology. It can be positioned as another purpose.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved by employing a sheet member provided with a plurality of resonance portions on a sheet having rubber elasticity. The present invention has been completed.

That is, the present invention provides various specific modes shown below.
[1] A sheet having rubber elasticity, and at least a plurality of resonance parts,
The resonance part is provided in contact with the sheet surface of the sheet,
A sound insulating sheet member having a maximum height of 3 mm or less from the opposite surface of the sheet surface provided with the resonance portion to the tip of the resonance portion.
[2] The sound insulating sheet member according to [1], wherein the sheet contains at least one selected from the group consisting of a heat or photocurable elastomer and a thermoplastic elastomer.
[3] The sound insulating sheet member according to [1] or [2], wherein the sheet has a Young's modulus of 0.01 MPa or more and 100 MPa or less.
[4] The sheet and the resonance part are integrally formed and contain at least one selected from the group consisting of a heat or photocurable elastomer and a thermoplastic elastomer. 3] The sound insulating sheet member according to any one of the above.
[5] The sound insulating sheet member further includes at least one or more rib-like protrusions,
Any one of [1] to [4], wherein the rib-like protrusion is provided in contact with the sheet surface of the sheet and has a height in the sheet normal direction higher than that of the resonance part. The sound-insulating sheet member according to 1.
[6] The sound insulating sheet member according to [5], wherein the rib-like protrusions are provided so as to extend in a sheet length direction of the sheet.
[7] The sound insulating sheet member according to [5] or [6], wherein the plurality of rib-like protrusions are spaced apart along the sheet length direction of the sheet.
[8] The sheet, the resonance part, and the rib-like protrusion are integrally formed, and contain both at least one selected from the group consisting of a heat or photocurable elastomer and a thermoplastic elastomer. And [5] to [7].
[9] The sound insulating sheet member according to any one of [1] to [8], and at least a support,
The sound insulating structure, wherein the support is provided in contact with at least one surface of the sound insulating sheet member and supports the sheet.
[10] The sound insulating structure according to [9], wherein the support has a Young's modulus of 1 GPa or more.
[11] A sound insulation structure, which is a laminate including the sound insulation sheet member according to any one of [1] to [8].
[12] A method for producing a sound insulating sheet member, comprising the following steps.
(8) A step of applying a photocurable elastomer precursor or a photocurable resin precursor to a mold having a plurality of cavities.
(9) A step of laminating a substrate on the elastomer precursor or resin precursor planarized on the mold.
(10) A step of filling the cavity of the laminate of the support and the mold with the elastomer precursor or the resin precursor by a pressure roll from the substrate side.
(11) By irradiating light from the substrate side, the elastomer precursor or resin precursor on which the cavity shape of the mold has been transferred is cured, and the cured product of the elastomer precursor or resin precursor and the substrate And polymerizing and bonding.
(12) (11) A step of peeling a bonded product of a cured product of the elastomer precursor or resin precursor from a mold.
[14] A method for producing a sound insulating sheet member, comprising the following steps.
(13) A roll mold having an outer peripheral surface in which a plurality of cavities are arranged is rotated, and the substrate is moved in the rotation direction of the roll mold along the outer peripheral surface of the roll mold, and photocured on the outer peripheral surface of the roll mold. Applying a functional elastomer precursor or a photocurable resin precursor,
Filling the cavity with the elastomer precursor or resin precursor.
(14) A step of irradiating the region between the outer peripheral surface of the roll mold and the substrate with the elastomer precursor or the resin precursor sandwiched between the outer peripheral surface of the roll mold and the substrate. (15) A step of peeling off the bonded product of the cured product of the elastomer precursor or resin precursor obtained in the step (14) and the substrate from the roll mold.

  According to the present invention, it is possible to provide a sound insulation sheet member that has a high sound insulation performance that surpasses the law of mass while being relatively light weight, is flexible, and is thin, and a sound insulation structure using the same. it can. In addition, it is possible to provide a sound insulation sheet member having a high degree of design freedom, excellent versatility, easy to manufacture, and capable of improving productivity and economy, and a sound insulation structure using the same.

It is a schematic perspective view which shows the sound insulation sheet member and sound insulation structure of 1st Embodiment. It is II-II arrow sectional drawing of FIG. It is a figure which shows an example of the manufacturing process of a sound insulation sheet member. It is a figure which shows an example of the manufacturing process of a sound insulation sheet member. It is a figure which shows an example of the manufacturing process of a sound insulation sheet member. It is a figure which shows an example of the manufacturing process of a sound insulation sheet member. It is a schematic perspective view which shows the sound insulation sheet member and sound insulation structure of 2nd Embodiment. It is VIII-VIII arrow sectional drawing of FIG. It is a schematic perspective view which shows the weight part of the sound insulation sheet member of 2nd Embodiment, and a sound insulation structure. It is a schematic perspective view which shows the weight part of a modification. It is a schematic perspective view which shows the weight part of a modification. It is a schematic block diagram of the unit cell used for estimation of an acoustic band gap. It is a schematic perspective view which shows the sound insulation sheet | seat member and sound insulation structure of 3rd Embodiment. It is IX-IX arrow sectional drawing of FIG. It is a figure which shows an example of a sound insulation structure. It is a figure which shows an example of use of a sound insulation structure.

The sound insulating sheet member of the present invention includes at least a sheet having rubber elasticity and a plurality of resonance parts, and the resonance parts are provided in contact with the sheet surface of the sheet, and are opposite to the sheet surface on which the resonance parts are provided. The maximum height from the tip of the resonance part to 3 mm or less. When the maximum height is within this range, the sound insulation function is provided, and the installation space necessary for the sound insulation sheet member can be reduced, and the overall size of a small electronic device or the like can be kept as small as possible. . The maximum height of the sound insulating sheet member (hereinafter sometimes referred to as the maximum height H) is the height indicated by H in FIG. 1 representing the first embodiment to be described later, and the sheet surface of the sheet 11 11
The height from b to the maximum height in the normal direction of the sheet 11 of the resonance part 21 is represented.
The maximum height H can be appropriately adjusted depending on the application, the sound insulation area, and the like, but is preferably 2.8 mm or less, and more preferably 2.5 mm or less. Moreover, when using for the use which isolates a high frequency, it is preferable that it is 1.0 mm or less. Moreover, although a minimum is not specifically limited, From a viewpoint of manufacture ease, it is 0.01 mm or more, for example.

The surface density (mass per unit area) of the sound insulating sheet member of the present invention can also be appropriately set according to desired performance, and is not particularly limited. For example, it is preferably ² kg / m ² or less, more preferably 1 kg / m ² or less. The lower limit of the surface density of the sound insulating sheet member is not particularly defined.
When the surface density of the sound insulating sheet member is within the above range, the sound insulating sheet member and the sound insulating structure can be made lighter, and the degree of freedom of these installation locations can be improved.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings. The following embodiments are examples for explaining the present invention, and the present invention is not limited only to the embodiments. In the following, unless otherwise specified, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios. In the present specification, for example, the description of a numerical range of “1 to 100” includes both the lower limit value “1” and the upper limit value “100”. This also applies to other numerical range notations.

  The sound insulating sheet member and / or the sound insulating structure of the present invention may be colored. By being a colored sound-insulating sheet member and / or a sound-insulating structure, it is possible to improve decorativeness and adjust the degree of visual recognition. The coloring method is not particularly limited, and examples thereof include a method of adding a colorant and the like to raw materials such as each sheet, the resonance part, and the support, and a method of laminating colored sheets.

(First embodiment)
FIG.1 and FIG.2 is the schematic perspective view which shows the sound insulation sheet | seat member 100 and the sound insulation structure 200 of this embodiment, and its II-II arrow sectional drawing. The sound insulation sheet member 100 includes a sheet 11 having rubber elasticity, a plurality of resonance portions 21 provided in contact with the sheet surface 11a of the sheet 11, and at least one or more ribs provided on the sheet surface 11a. And a protrusion 31. The sound insulation sheet member 100 is supported by a support body 51 provided on the sheet surface 11 b side of the sheet 11, thereby forming a sound insulation structure 200.

  In the sound insulating sheet member 100 and the sound insulating structure 200, for example, when a sound wave is incident from a noise source on the support 51 side, the sheet 11 and / or the resonance unit 21 resonates. At this time, there can be a frequency region in which the direction of the force acting on the support 51 and the direction of the acceleration generated in the seat 11 and / or the resonance part 21 can be reversed, and part or all of the vibration of the specific frequency is canceled out. As a result, a complete acoustic band gap is generated in which vibration at a specific frequency is almost completely absent. Therefore, some or all of the vibrations are stationary in the vicinity of the resonance frequency of the seat 11 and / or the resonance part 21, and as a result, a high sound insulation performance that surpasses the mass law is obtained. A sound insulation member using such a principle is called an acoustic metamaterial. Hereinafter, each component of the sound insulation sheet member 100 and the sound insulation structure 200 of the present embodiment will be described in detail.

[Sheet]
The sheet 11 is a sheet having rubber elasticity. Although not particularly limited, it may have rubber elasticity due to molecular motion of the resin (organic polymer). The sheet 11 can also function as a vibrator (resonator) that vibrates at a certain frequency when a sound wave is incident from a noise source.
The material constituting the sheet 11 preferably contains at least one selected from the group consisting of heat or photocurable elastomers and thermoplastic elastomers.
When casting using a metal mold or the like, it is necessary to fill the cavity of the mold surface with an elastomer. However, the photo-curable elastomer is a cavity with a relatively low viscosity liquid before curing. It is preferable because the inside can be filled and the filling rate can be increased.

Specifically, the material constituting the sheet 11 is a vulcanized thermosetting resin elastomer such as a chemically crosslinked natural rubber or synthetic rubber, a urethane thermosetting resin elastomer, a silicone thermosetting resin system. Thermosetting resin-based elastomers such as elastomers, fluorine-based thermosetting resin-based elastomers, and acrylic thermosetting resin-based elastomers;
Photocurable elastomers such as acrylic photocurable elastomers, silicone photocurable elastomers, and epoxy photocurable elastomers;
Heat of olefin-based thermoplastic elastomer, styrene-based thermoplastic elastomer, PVC-based thermoplastic elastomer, urethane-based thermoplastic elastomer, ester-based thermoplastic elastomer, amide-based thermoplastic elastomer, silicone-based thermoplastic elastomer, acrylic-based thermoplastic elastomer, etc. Examples thereof include a plastic elastomer.
Further specific examples of the above-mentioned heat or photocurable elastomer and thermoplastic elastomer include rubber. Specifically, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene-propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluorine rubber, epichlorohydrin rubber , Polyester rubber, urethane rubber, silicone rubber, and modified products thereof, but are not particularly limited thereto. These can be used alone or in combination of two or more.
Among these, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluorine rubber, epichlorohydrin rubber, Polyester rubber, urethane rubber, silicone rubber and modified products thereof are preferable, and silicone rubber, acrylic rubber and modified products thereof are more preferable. By using these materials, it tends to be excellent in heat resistance and cold resistance.

As long as the sheet 11 is a sheet having so-called rubber elasticity, the sheet 11 may contain various additives such as a flame retardant, an antioxidant, a plasticizer, and a colorant.
A flame retardant is an additive blended to make a flammable material difficult to burn or ignite. Specific examples include pentabromodiphenyl ether, octabromodiphenyl ether, decabromodiphenyl ether, bromine compounds such as tetrabromobisphenol A, hexabromocyclododecane, hexabromobenzene, phosphorus compounds such as triphenyl phosphate, and chlorine such as chlorinated paraffin. Compounds, antimony compounds such as antimony trioxide, metal hydroxides such as aluminum hydroxide, nitrogen compounds such as melamine cyanurate, boron compounds such as sodium borate and the like can be mentioned, but not limited thereto.
Moreover, antioxidant is an additive mix | blended for oxidation deterioration prevention. Specific examples thereof include, but are not particularly limited to, phenolic antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and the like.
Furthermore, a plasticizer is an additive blended to improve flexibility and weather resistance. Specific examples thereof include phthalic acid ester, adipic acid ester, trimellitic acid ester, polyester, phosphoric acid ester, citric acid ester, sebacic acid ester, azelaic acid ester, maleic acid ester, silicone oil, mineral oil, vegetable oil, and these. However, it is not particularly limited to these.
Furthermore, examples of the colorant include dyes and pigments.
These can be used alone or in combination of two or more.

  In this embodiment, although the sheet | seat 11 is formed in square shape by planar view, the shape is not specifically limited to this. Adopt any plan view shape such as triangular shape, rectangular shape, rectangular shape, trapezoidal shape, rhombus shape, polygonal shape such as pentagonal shape and hexagonal shape, circular shape, elliptical shape, indefinite shape not classified into these. Can do. In addition, unless the characteristic as an acoustic metamaterial is lost, the sheet | seat 11 may have a cut | notch part, a punching hole, etc. in arbitrary places from viewpoints, such as an improvement of expansion-contraction performance and weight reduction.

The thickness of the sheet 11 is not particularly limited as long as the maximum height of the sound insulating sheet member falls within the scope of the present invention. Since the frequency band (acoustic band gap width and frequency position) expressing high sound insulation performance can be controlled also by the thickness of the sheet 11, the thickness of the sheet 11 is set so that the acoustic band gap matches the desired sound insulation frequency region. It can be set appropriately. When the thickness of the sheet 11 is thick, the acoustic band gap width is narrowed and tends to shift to the low frequency side. Moreover, when the thickness of the sheet 11 is thin, the acoustic band gap width becomes wide and tends to shift to the high frequency side.
From the viewpoint of sound insulation performance, mechanical strength, flexibility, handling properties, and the like, the thickness of the sheet 11 is preferably 10 μm or more, more preferably 50 μm or more, and even more preferably 100 μm or more. The thickness of the sheet 11 is preferably 2 mm or less, more preferably 1 mm or less, and further preferably 500 μm or less.

The sheet 11 preferably has a Young's modulus of 0.01 MPa or more, more preferably 0.1 MPa or more, preferably from the viewpoint of sound insulation performance, mechanical strength, flexibility, handling properties, productivity, and the like. Preferably has a Young's modulus of 100 MPa or less, more preferably 10 MPa or less.
Here, the Young's modulus in this specification means the ratio of the force (stress) and the deformation rate (strain) acting per unit cross-sectional area of the sample when an external force is applied in the uniaxial direction. JIS K 6394: 2007 It means the value at 25 ° C. and 10 Hz of the freshly stored elastic modulus measured by the forced vibration non-resonant method of “vulcanized rubber and thermoplastic rubber—how to obtain dynamic properties”.

  Moreover, it is preferable that the sheet | seat 11 has a glass transition temperature of 0 degrees C or less from a viewpoint of reducing the temperature dependence of the sound insulation in low temperature. As the glass transition temperature of the sheet 11 is lower, the cold resistance is improved, the temperature dependency of the elastic modulus in the vicinity of 0 ° C. is reduced, and the sound insulation performance tends to be less dependent on the environmental temperature. More preferably, it is -10 degrees C or less, More preferably, it is -20 degrees C or less, Most preferably, it is -30 degrees C or less. In the present specification, the glass transition temperature of the sheet 11 means the peak temperature of the loss tangent in the dynamic viscoelasticity measurement at the frequency of 10 Hz, particularly the temperature dependence measurement.

[Resonant part]
The resonance unit 21 functions as a vibrator (resonator) that vibrates at a certain frequency when a sound wave is incident from a noise source. The resonating part 21 of the present embodiment may be composed of a composite structure including a base part 22 and a weight part 23 supported by the base part 22 and having a mass larger than that of the base part 22, or a single structure. It may be a body. Moreover, the composite structure and the single structure may be mixed.
In the case of a composite structure, the resonance part 21 effectively functions as a resonator having a resonance frequency determined by the mass of the weight part 23 serving as a weight and the spring constant of the base part 22 functioning as a spring.

  The arrangement, number of installations, size, and the like of the resonating units 21 can be appropriately set according to desired performance, and are not particularly limited. The resonance unit 21 is provided in contact with at least one sheet surface of the sheet. For example, in the present embodiment, the plurality of resonating parts 21 are arranged at regular intervals in a lattice shape, but the arrangement of the resonating parts 21 is not particularly limited thereto. For example, the plurality of resonating portions 21 may be arranged in a zigzag manner or randomly, for example. Since the sound insulation mechanism using this sheet does not use Bragg scattering as in the so-called phononic crystal, the intervals of the resonance portions 21 do not necessarily have to be regularly and periodically arranged.

Further, the number of the resonance parts 21 per unit area is not particularly limited as long as the resonance parts 21 can be arranged so as not to interfere with each other due to contact between the resonance parts 21.
The maximum number of the resonance parts 21 per unit area varies depending on the shape of the resonance part 21 and the like. For example, the resonance part 21 is cylindrical, and the height direction of the cylinder is installed parallel to the sheet normal direction, and When the cylinder cross-sectional diameter is 1 cm, 100 or less per 10 cm ² is preferable.
The minimum number of the resonance parts 21 per unit area is, for example, 10 cm when the resonance part 21 is cylindrical, the height direction of the cylinder is set parallel to the sheet normal direction, and the cross-sectional diameter is 1 cm. ^Two or more per 2 are preferable, more preferably 10 or more, and still more preferably 50 or more. When the number of the resonating units 21 is equal to or more than the preferable lower limit, higher sound insulation performance tends to be obtained. Moreover, it becomes easy to aim at the weight reduction of the whole sheet | seat by being below said preferable upper limit.

The maximum height H1 of the resonance part 21 in the normal direction of the sheet 11 can be appropriately set according to desired performance, and is not particularly limited. From the standpoints of ease of molding and improvement of productivity, the maximum height H1 is preferably 10 μm or more, more preferably 100 μm or more, and further preferably 1 mm or more. Moreover, 2.5 mm or less is preferable, More preferably, it is 2 mm or less, More preferably, it is 1.8 mm or less. By making it within the above preferable numerical range, the sheet 11 provided with the resonating portion 21 (that is, the sound insulating sheet member 100) can be easily wound and stacked, and can be manufactured in a so-called roll-to-roll manner or in a roll shape. Can be stored, and the productivity and economy tend to be improved.
Further, the height of the resonance portion 21 in the normal direction of the sheet 11 may not be the same for all the resonance portions, or may be different. Due to the difference in the height of the resonance part, an effect such as expansion of a frequency region in which sound insulation performance appears may be obtained.

<When the resonance part 21 has a base part and a weight part>
When the resonance part 21 has a base part and a weight part, the base part and the weight part will be described below.
[base]
In the present embodiment, a plurality of base portions 22 having a substantially cylindrical outer shape are provided in contact with each other on the sheet surface 11 a of the sheet 11, and a weight portion having a substantially cylindrical outer shape is provided inside the base portion 22. 23 are buried. The outer shape of the base 22 is not particularly limited, and is a triangular prism shape, a rectangular column shape, a trapezoidal column shape, a polygonal column shape such as a pentagonal column or a hexagonal column, a cylindrical shape, an elliptical column shape, a truncated pyramid shape, a truncated cone shape, a truncated pyramid shape, a conical shape. Any shape such as a hollow cylindrical shape, a branched shape, or an indefinite shape not classified into these can be adopted. Moreover, it can also form in the column shape which has a different cross-sectional area and / or cross-sectional shape with the height position of the base part 22. FIG.
Moreover, the shape and height of the base provided in contact with each other on the sheet surface 11a may be the same or different.

The material of the base 22 is not particularly limited as long as the required characteristics are satisfied. For example, a polymeric material is mentioned, At least 1 sort (s) selected from the group which consists of a heat | fever or photocurable elastomer, a thermoplastic elastomer, a heat | fever or photocurable resin, and a thermoplastic resin is mentioned.
Examples of the heat or photocurable elastomer and the thermoplastic elastomer include those exemplified for the sheet.
Examples of the thermosetting or photocurable resin include acrylic thermosetting resins, urethane thermosetting resins, silicone thermosetting resins, and epoxy thermosetting resins. Examples of the thermoplastic resin include polyolefin-based thermoplastic resins, polyester-based thermoplastic resins, acrylic-based thermoplastic resins, urethane-based thermoplastic resins, and polycarbonate-based thermoplastic resins.
Specific examples include vulcanized rubber such as chemically crosslinked natural rubber or synthetic rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber. , Rubbers such as acrylic rubber, fluorine rubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber and modified products thereof; polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, Polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resin, oxazine resin Like polymers etc., but not particularly limited thereto. These can be used alone or in combination of two or more.
Further, the base 22 may be a porous body including pores (gas such as air) in these polymer materials. Furthermore, the base 22 may include a liquid material such as mineral oil, vegetable oil, or silicone oil. In addition, when the base part 22 contains a liquid material, it is desirable to contain in a polymeric material from a viewpoint of suppressing the outflow to the exterior of a liquid material.

Among these, it is preferable that the material of the base 22 is the same material as the sheet 11 described above, and elastomers are particularly preferable. If the sheet 11 and the base 22 contain the same elastomers, it is easy to integrally form the sheet 11 and the base 22 and the productivity is dramatically improved. That is, it is particularly preferable that the sheet 11 and the resonating part 21 (base part 22) are an integrally molded product containing at least one selected from the group consisting of a heat or photocurable elastomer and a thermoplastic elastomer. It is one of.
Specific examples of elastomers include vulcanized rubber such as chemically crosslinked natural rubber or synthetic rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfone. Polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber and modified products thereof, polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene , Polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resin, oxadi Although resins, not particularly limited thereto.
Among these, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluorine rubber, epichlorohydrin rubber, Polyester rubber, urethane rubber, silicone rubber and modified products thereof are preferable, and silicone rubber, acrylic rubber and modified products thereof are more preferable from the viewpoint of excellent heat resistance and cold resistance.

  The base 22 can be a two-color molded body or a multicolor molded body made of two or more polymer materials. In this case, by using the same elastomer as the sheet 11 described above for the base portion 22 on the side in contact with the sheet 11, the sheet 11 and the base portion 22 can be easily formed integrally.

  In addition, when providing the resonance part 21 (base part 22) with circular cross section like this embodiment, the resonance part 21 (base part 22) height position where the sum total of the cross-sectional area of several resonance part 21 (base part 22) becomes the largest. In the cross section parallel to the sheet surface 11a of the sheet 11, the circle having the maximum diameter among the circles (circular cross section) included in the cross section is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 20 mm. It is as follows. The diameter of the circle having the smallest diameter is preferably 10 μm or more, more preferably 100 μm or more, and further preferably 1 mm or more. By making it within the above preferable numerical range, a predetermined number or more of the resonating portions 21 (base portions 22) to be installed on the seat surface 11a of the seat 11 can be secured, and further good sound insulation performance can be obtained, There is a tendency that moldability and productivity are further improved.

[Weight part]
The weight part 23 is not particularly limited as long as it has a larger mass than the base part 22 described above. In the present embodiment, it is formed in a substantially cylindrical shape whose maximum diameter is smaller than that of the base portion 22, and is embedded in the base portion 22 on the distal end side of the resonance portion 21. Thus, since the weight part 23 which acts as the weight of the resonator is supported by the base part 22 that determines the spring constant, for example, the spring constant by changing the shape or material (elastic modulus, mass) of the base part 22 is adopted. The resonance frequency of the resonance part 21 can be easily controlled by adjusting the weight of the weight part 23 or changing the mass of the weight part 23. In general, when the elastic modulus of the base portion 22 decreases, the acoustic band gap tends to shift to the low frequency side. Moreover, when the mass of the weight part 23 increases, the acoustic band gap tends to shift to the low frequency side.

The material constituting the weight portion 23 may be appropriately selected in consideration of mass, cost, etc., and the type is not particularly limited. From the viewpoint of downsizing the sound insulation sheet member 100 and the sound insulation structure 200 and improving the sound insulation performance, the material constituting the weight portion 23 is preferably a material with high specific gravity.
Specifically, metals or alloys such as aluminum, stainless steel, iron, tungsten, gold, silver, copper, lead, zinc, and brass; inorganic glasses such as soda glass, quartz glass, and lead glass; powders of these metals or alloys Or a composite containing the inorganic glass or the like in the polymer material of the base portion 22 described above, but is not particularly limited thereto. The material, mass, and specific gravity of the weight portion 23 may be determined so that the sound insulation sheet member 100 and the sound insulation structure 200 acoustic band gaps coincide with a desired sound insulation frequency region.
Among these, from the viewpoint of low cost and high specific gravity, at least one selected from the group consisting of metals, alloys, and inorganic glasses is preferable. The specific gravity means the ratio between the mass of the material and the mass of pure water at 4 ° C. under the same volume of 1013.25 hPa. In this specification, JIS K 0061 “Chemical product density” And the value measured by the “specific gravity measuring method”.

In the present embodiment, the weight portion 23 is embedded in the base portion 22 on the distal end side of the resonance portion 21, but the installation position is not particularly limited thereto. Although depending on the shape, mass, elastic modulus, and the like of the base portion 22 and the weight portion 23, the center of gravity (mass center) of the resonance portion 21 is at least the resonance portion from the viewpoint of reducing the thickness, weight, or improving the sound insulation performance of the sound insulation sheet member. It is preferable that the base portion 22 and the weight portion 23 are arranged so as to be positioned on the tip side from the center in the height direction of 21. Typically, the weight part 23 may be offset from the center of the resonance part 21 in the height direction.
Note that the weight portion 23 may be completely embedded in the base portion 22, or may be partially embedded, or may be provided on the base portion 22 without being embedded in the base portion 22. Good.
In addition, when the base portion 22 has a branched structure, from the viewpoint of reducing the weight of the sound insulating sheet member or improving the sound insulating performance, when providing the weight portion on the branch portion provided from the branch point, than the center of the branch portion. It is preferable to arrange the weight portion 23 so as to be positioned on the distal end side.
Further, the shape and height of the plurality of weight parts 23 included in the sound insulating sheet member may be the same or different.

  In addition, although the resonance part 21 is provided with two or more on the sheet | seat surface 11a of the sheet | seat 11, the material which comprises the resonance part 21, the arrangement | positioning of the resonance part 21, a shape, a magnitude | size, the direction of installation of the resonance part 21, etc. All of the plurality of resonating portions 21 are not necessarily the same. By installing a plurality of types of resonating portions 21 in which at least one of them is different, it is possible to expand a frequency region where high sound insulation performance appears.

<When the resonance part 21 is a single structure or a composite structure and a single structure are mixed>
In the case where the resonating part 21 is a single structure, the material of the resonating part 21 is not particularly limited as long as the above-described required characteristics are satisfied, and examples thereof include those mentioned as the material of the base part 22. Among these, it is preferable that the material of the resonance part 21 is the same material as the sheet | seat 11 mentioned above, and elastomers are especially preferable. If the sheet 11 and the base 22 contain the same elastomer, the sheet 11 and the resonance part 21 can be easily formed integrally, and productivity can be dramatically increased. This is one of the particularly preferred embodiments in which the sheet 11 and the resonating portion 21 are an integrally molded product containing at least one selected from the group consisting of a heat or photo-curable elastomer and a thermoplastic elastomer. It is. These are the same even when the resonance part 21 is a mixture of a composite structure and a single structure.

  In addition, when providing the resonance part 21 (The base part 22 is included when the composite structure and the single structure are mixed.) Like this embodiment, the some resonance part 21 ( In a cross section parallel to the sheet surface 11a of the sheet 11 at the height of the resonance section 21 (base section 22) where the sum of the cross-sectional areas of the base section 22) is maximum, the diameter of the circle (circular section) included in the cross section is the same. The diameter of the largest circle is preferably 100 mm or less, more preferably 50 mm or less, and still more preferably 20 mm or less. The diameter of the circle having the smallest diameter is preferably 10 μm or more, more preferably 100 μm or more, and further preferably 1 mm or more. By making it within the above preferable numerical range, a predetermined number or more of the resonating portions 21 (base portions 22) to be installed on the seat surface 11a of the seat 11 can be secured, and further good sound insulation performance can be obtained, There is a tendency that moldability and productivity are further improved.

[Rib-shaped protrusion]
The sound insulating sheet member of the present invention may have a rib-like protrusion 31. In the present embodiment, the rib-like protrusions 31 are each formed in a substantially plate shape so as to extend in the length direction of the sheet 11 (sheet flow direction, MD direction). The rib-shaped protrusions 31 are provided on the sheet surface 11a of the sheet 11, more specifically, at two positions on the edge of the sheet 11 in the width direction (perpendicular to the sheet flow direction, TD direction). .

The rib-shaped protrusion 31 has a maximum height H2 that is higher than the maximum height H1 of the resonance part 21 described above with respect to the normal direction of the sheet 11. As a result, even if the sound insulating sheet member 100 is wound into a sheet shape or a plurality of sheets are stacked, the rib-shaped protrusion 31 functions as a spacer, so that the contact of the resonance portion 21 with the back surface of the sheet 11 is suppressed. . Therefore, by providing the rib-like protrusion 31, the sound insulation sheet member 100 can be formed by a so-called roll-to-roll without causing manufacturing troubles such as deformation, mutation, cracking, dropping, and breakage of the resonance part 21. Easy to manufacture and store. In addition, the maximum height H2 of the rib-shaped protrusion part 31 should just be higher than the maximum height H1 of the resonance part 21, and is not specifically limited. From the viewpoints of ease of molding and improvement of productivity, it is preferably 50 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. Moreover, 2.7 mm or less is preferable, 2.2 mm or less is more preferable, and 2.0 mm or less is further more preferable.

  The shape and installation position of the rib-shaped protrusion 31 are not particularly limited as long as the rib-shaped protrusion 31 is installed so as not to interfere with the resonance unit 21 that functions as a resonator. For example, the outer shape of the rib-shaped protrusion 31 is not particularly limited, and is a triangular column shape, a rectangular column shape, a trapezoidal column shape, a polygonal column shape such as a pentagonal column or a hexagonal column, a cylindrical shape, an elliptical column shape, a truncated pyramid shape, a truncated cone shape, Arbitrary shapes, such as a pyramid shape, a cone shape, a hollow cylinder shape, and an indefinite shape not classified into these, can be adopted. Moreover, it can also form in the column shape which has a cross-sectional area and / or cross-sectional shape which change with the height position of the rib-shaped projection part 31. FIG. Moreover, the maximum length of the rib-shaped projection part 31 in the length direction of the sheet 11 is not particularly limited as long as it is equal to or less than the maximum length in the MD direction of the sheet.

  In the present embodiment, a pair of rib-like protrusions 31 extending in the length direction of the sheet 11 are employed, but a plurality of rib-like protrusions 31 having a maximum length shorter than this are used. 11 may be spaced apart along the length direction. At this time, the arrangement interval of each rib-like protrusion 31 may be periodic or random. When the plurality of rib-like protrusions 31 are thus spaced apart, the distance between the rib-like protrusions 31 is not particularly limited, but is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 20 mm or less. .

  Although the material which comprises this rib-shaped projection part 31 is not specifically limited, The same polymer material as the sheet | seat 11 and / or the resonance part 21 (base part 22) is preferable, and the same elastomer as the sheet | seat 11 and the resonance part 21 (base part 22) Are more preferred. If the same polymer material as that of the sheet 11 and / or the base portion 22 is employed, integral molding with the sheet 11 and / or the resonance portion 21 (base portion 22) is facilitated, and productivity is dramatically increased.

[Support]
The sound insulation sheet member of the present invention can be appropriately installed according to the environment in which the sound insulation performance is manifested. For example, the sound insulation sheet member may be installed directly on the apparatus, the structure, or the like. An adhesive layer or the like may be provided between the sound insulating sheet member and the device or structure. Further, the sound insulating sheet member may be used in a form supported by a support. When sound insulation is performed using the sound insulation sheet member of the present invention, the support may support the sound insulation sheet member, and may not be supported by the support during production, storage, or the like.
The support body only needs to be provided in contact with at least one surface of the sheet of the sound insulating sheet member, on the sheet surface provided in contact with the resonance portion and / or on the sheet surface provided in contact with the resonance portion. It may be provided on the other surface.

In the present embodiment, a support body 51 is provided on the back surface 11 b side of the sheet 11. Although the material which comprises this support body 51 will not be specifically limited if the sheet | seat 11 can be supported, From a viewpoint of improving sound-insulation performance, a thing higher than the sheet | seat 11 is preferable. Specifically, the support 51 preferably has a Young's modulus of 1 GPa or more, and more preferably 1.5 GPa or more. Although there is no upper limit in particular, 1000 GPa or less is mentioned, for example.
Further, when the sound insulation sheet member is directly installed on the apparatus, the structure, etc., the surface on which the sound insulation sheet member is installed has the same rigidity as the above support from the viewpoint of supporting the sheet, enhancing the sound insulation performance, and the like. It is preferable.

The material which comprises the support body 51 is not specifically limited. For example, a photocurable resin sheet, a thermosetting resin sheet, a thermoplastic resin sheet, a metal plate, an alloy plate, etc. are mentioned. As for a photocurable resin sheet, a thermosetting resin sheet, and a thermoplastic resin sheet, the photocurable resin quoted by the said base, the sheet | seat using a thermosetting resin, and a thermoplastic resin etc. are mentioned.
Specific examples of the material constituting the support 51 include, for example, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polybutylene succinate, poly (meth) acrylate resins such as polymethyl methacrylate, and isosorbide. Polycarbonate resins such as polycarbonate as main raw materials, polyolefin resins such as polyethylene, polypropylene and polynorbornene, vinyl chloride resin, polyacrylonitrile, polyvinylidene chloride, polyethersulfone, polyphenylene sulfide, polyarylate, polyamide, polyimide, triacetyl cellulose , Organic materials such as polystyrene, epoxy resin, oxazine resin, aluminum, stainless steel, iron, copper, zinc, brass in these organic materials Metals, inorganic glasses, etc. composite material comprising inorganic particles and fibers.
Among these, from the viewpoint of sound insulation, rigidity, moldability, cost, etc., the support is selected from the group consisting of a photocurable resin sheet, a thermosetting resin sheet, a thermoplastic resin sheet, a metal plate, and an alloy plate. At least one of these is preferred. Here, the thickness of the support 51 is not particularly limited, but is preferably 0.05 mm or more and 0.5 mm or less from the viewpoint of sound insulation performance, rigidity, formability, weight reduction, cost, and the like.
Furthermore, the support body 51 may be provided with a coating layer on the surface of the support body 51 from the viewpoint of light transmittance, adhesion to the sound insulation sheet member, and the like.

  In addition, the shape of the support body 51 can be suitably set according to the installation surface of the sound insulation structure 200 and is not particularly limited. For example, it may be a flat sheet shape, a curved sheet shape, or a special shape processed so as to have a curved surface portion or a bent portion. Furthermore, from the viewpoint of weight reduction or the like, a notch, a punched portion, or the like may be provided at any place of the support body 51.

  Further, the surface density (mass per unit area) of the support 51 can be appropriately set according to the desired performance, and is not particularly limited. From the viewpoint of enhancing the effect of the present invention, the surface density of the support 51 is preferably 80% or less, more preferably 30% or less, and even more preferably 10% or less of the surface density of the sound insulating sheet member 100.

(Second Embodiment)
7 and 8 are a schematic perspective view showing the sound insulating sheet member 101 and the sound insulating structure 201 of the present embodiment, and a cross-sectional view taken along the arrow thereof. In the present embodiment, the sound insulation sheet member 100 and the sound insulation structure of the first embodiment described above are different except that the number of installed resonance parts, the shape of the base and the weight part, and the shape and the number of installation of the rib-like protrusions are different. Since it has a configuration equivalent to that of the body 200, a duplicate description is omitted here.

  The resonance part 21 of the present embodiment is composed of a composite structure including a base 24 and a weight part 25 that is supported by the base 24 and has a larger mass than the base 24. Also in this embodiment, a plurality of base portions 24 having a substantially cylindrical outer shape are provided in contact with the sheet surface 11 a of the sheet 11.

  As shown in FIG. 9, the weight portion 25 has a substantially conical convex portion 25 a provided toward the base portion 24. The weight portion 25 is supported on the upper surface side of the base portion 24 in a state where the convex portion 25 a is embedded in the base portion 24. Even if comprised in this way, drop-off | omission of the weight part 25 is suppressed. In addition, as long as the shape of the convex part 25a is provided toward the base 24, it is not specifically limited. For example, as shown in FIGS. 10 and 11, it can be a columnar convex portion 25 b or a hollow cylindrical convex portion 25 c. In addition to these, for example, spherical, hemispherical, elliptical spherical, triangular columnar, rectangular columnar, trapezoidal columnar, polygonal column such as pentagonal or hexagonal column, elliptical column, truncated pyramid, truncated cone, pyramid Arbitrary shapes such as indefinite shapes that are not classified can be adopted.

  On the other hand, the rib-like projections 32 of the present embodiment are formed in a substantially cylindrical shape, and each rib-like projection 32 is an edge in the width direction of the sheet 11 (perpendicular to the sheet flow direction, TD direction). In the section, the sheets 11 are spaced apart from each other along the length direction of the sheet 11 (sheet flow direction, MD direction).

  Also in this embodiment, the same operation effect as the 1st embodiment mentioned above is produced. In addition to this, in the present embodiment, since the plurality of rib-like protrusions 32 are spaced apart so as to form a line, the followability (flexibility) of the sound insulating sheet member 101 is further enhanced. Therefore, the flexible sheet 11 that can be expanded and contracted can follow the surface shape even on a more complicated application surface, and as a result, the sheet 11 can be stably mounted on the support 51.

(Third embodiment)
FIG. 13 is a schematic perspective view showing the sound insulating sheet member 102 of the present embodiment, and FIG. 14 is a sectional view taken along the line XX-XX. The sound insulating sheet member 102 includes a sheet 11 having rubber elasticity and a plurality of resonance portions 21 a and 21 b provided on the sheet surface 11 a of the sheet 11. The resonance parts 21a and 21b are resonance parts having different heights.
In the present embodiment, the sound insulation sheet member 100 or 101 of the first and second embodiments described above, and the sound insulation structure, except that the number of the resonance parts and the rib-like protrusions and the support are not installed. Since it has a configuration equivalent to 200 or 201, redundant description here is omitted. In this embodiment, the resonance unit is an example of a single structure, but as described above, the present invention is not limited to this. Further, the rib-like protrusions and the support can be provided as appropriate as in the other embodiments.

  In the present embodiment, the resonating parts 21a and 21b have a triangular pyramid shape. A portion located on the opposite side of the bottom surface in contact with the sheet surface 11a is on the surface. The outer shape of the resonance portions 21a and 21b is not particularly limited, and the shape of the portion on the opposite side of the bottom surface that is in contact with the sheet surface 11a is not particularly limited. The concave shape can be adjusted as appropriate.

[Production method]
Although the manufacturing method of the sound-insulating sheet | seat member of this invention and a sound-insulating structure is not specifically limited, For example, the manufacturing methods 1-4 are mentioned below.
Although the shape of the cavity used in each manufacturing method is not particularly limited, for example, the shape of the bottom can be appropriately selected such as a hemispherical shape, a planar shape, a convex shape, or a concave shape.

(Manufacturing method 1)
The manufacturing method 1 may include the following steps (1) to (3).
(1) A step of preparing a mold having a plurality of cavities and pouring a resin material and / or a polymer material into the cavities.
(2) A step of curing the poured resin material and / or polymer material.
(3) A step of peeling the obtained cured product from the mold.
In the manufacturing method 1, you may have the process of providing a support body in the obtained hardened | cured material after the (2) or (3) process.

(Manufacturing method 2)
The manufacturing method 2 may include the following steps (4) to (7).
(4) A step of preparing a mold having a plurality of cavities and placing weights in the plurality of cavities provided in the mold.
(5) A step of pouring a resin material and / or a polymer material into the cavity.
(6) A step of curing the poured resin material and / or polymer material.
(7) A step of peeling the obtained cured product from the mold.
In the manufacturing method 2, you may have the process of providing a support body in the obtained hardened | cured material after the (6) or (7) process.

(Manufacturing method 3)
The production method 3 may include the following steps (8) to (11).
(8) A step of applying a photocurable elastomer precursor or a photocurable resin precursor to a mold having a plurality of cavities.
(9) A step of laminating a substrate on the elastomer precursor or resin precursor planarized on the mold.
(10) A step of filling the cavity of the laminate of the support and the mold with the elastomer precursor or the resin precursor by a pressure roll from the substrate side.
(11) By irradiating light from the substrate side, the elastomer precursor or resin precursor on which the cavity shape of the mold has been transferred is cured, and the cured product of the elastomer precursor or resin precursor and the substrate And polymerizing and bonding.
(12) (11) A step of peeling a bonded product of a cured product of the elastomer precursor or resin precursor from a mold.

(Manufacturing method 4)
The manufacturing method 4 may include the following steps (13) to (15).
(13) A roll mold having an outer peripheral surface in which a plurality of cavities are arranged is rotated, and the substrate is moved in the rotation direction of the roll mold along the outer peripheral surface of the roll mold, and photocured on the outer peripheral surface of the roll mold. Applying a functional elastomer precursor or a photocurable resin precursor,
Filling the cavity with the elastomer precursor or resin precursor.
(14) A step of irradiating the region between the outer peripheral surface of the roll mold and the substrate with the elastomer precursor or the resin precursor sandwiched between the outer peripheral surface of the roll mold and the substrate. (15) A step of peeling off the bonded product of the cured product of the elastomer precursor or resin precursor obtained in the step (14) and the substrate from the roll mold.

In steps (10) and (11) of manufacturing method 3 and steps (13) and (14) of manufacturing method 4, a sound insulating sheet member having a resonance part and a sheet can be formed.
The board | substrate used by the manufacturing methods 3 and 4 is not specifically limited. The sound insulating sheet member formed on the substrate may be used as it is, or the substrate may be peeled off.
After the step (11) or (12) of the production method 3 and the step (14) or (15) of the production method 4, a step of further providing a support may be provided. The substrate may be a support.

The steps (10) and (11) of the manufacturing method 3 and the steps (13) and (14) of the manufacturing method 4 may be provided a plurality of times. For example, in the manufacturing method 4, you may carry out in order of (13), (14), (13), (14), (15) process.
Moreover, when providing in multiple times, the photocurable elastomer precursor or photocurable resin precursor to be used may differ. For example, in the production method 4, the photocurable elastomer precursor or the photocurable resin precursor used in the first (13) step and the second (13) step may be different. Metal powder or the like may be mixed with the second photocurable elastomer precursor or photocurable resin precursor, and the cured product (resonant portion) obtained in the step (15) may be the base and the weight.

  For the production methods 3, 4 and the like, the production methods described in International Publication No. 2010/30804794 can be referred to.

(One form of manufacturing method of sound insulation sheet member using Embodiment 1)
One form of the manufacturing method of a sound insulation sheet member is shown using Embodiment 1 mentioned above. The method for manufacturing the sound insulating sheet member and the sound insulating structure of the present invention is not limited to this. Moreover, it can apply mutatis mutandis also in other embodiments.
The sound insulating sheet member 100 can be obtained by providing the above-described resonance portion 21 and the rib-like projection portion 31 on the sheet surface 11 a of the sheet 11. The installation method of the resonance part 21 and the rib-shaped projection part 31 is not specifically limited. For example, a method in which each separately molded part is heat-pressed or pressure-bonded and bonded, a method of bonding using various known adhesives, a method of bonding by thermal welding, ultrasonic welding, laser welding, or the like is exemplified. The Examples of adhesives include epoxy resin adhesives, acrylic resin adhesives, polyurethane resin adhesives, silicone resin adhesives, polyolefin resin adhesives, polyvinyl butyral resin adhesives, and mixtures thereof. However, it is not particularly limited to these. Note that a part or the whole of the resonance part 21 and the rib-like projection part 31 can also be formed by punching a rubber plate obtained by the molding method. Moreover, when a part of the resonance part 21 is a metal or an alloy, it can be formed by cutting the metal or the alloy.

From the viewpoint of improving productivity and economy, a method of integrally forming the sound insulating sheet member 100 by die molding, cast molding, or the like is preferable. As an example, using a mold or a casting mold having a shape corresponding to an integrally molded product of the sheet 11, the resonance part 21, and the rib-shaped protrusion 31, the resonance part 21, the sheet 11, the resonance part 21, and the ribs are used. The method of shape | molding the integral molded product of the protruding part 31 is mentioned. As such an integral molding method, various known methods such as a press molding method, a compression molding method, a casting molding method, an extrusion molding method, and an injection molding method are known, and the type is not particularly limited. In addition, if the raw material of each component is a resin material and polymer material which have rubber elasticity, for example, it can be poured in a cavity with the form of a liquid precursor or a heating melt. Moreover, if it is a metal, an alloy, or inorganic glass, it can arrange | position previously (insert) in the predetermined position in a cavity.
The resin material or the polymer material is not particularly limited. For example, the material which was illustrated by the sheet | seat which is a sound-insulation sheet | seat member of this invention, a base part, those raw materials, an intermediate body, etc. are mentioned.

  3-6 is a figure which shows an example of the manufacturing process of the sound-insulation sheet | seat member 100. FIG. Here, a mold 61 having a cavity 61a having a shape corresponding to the above-described resonating portion 21 and a cavity 61b having a shape corresponding to the rib-shaped protrusion 31 is used (see FIG. 3), and the cavity 61a of the mold 61 is used. The weight part 23 is disposed (see FIG. 4), and then a resin material having rubber elasticity is poured into the cavities 61a and 61b and heated or pressurized as necessary (see FIG. 5), and then the sheet 11, the resonance part The integrally molded product of 21 and the rib-like protrusion 31 is released to obtain the sound insulating sheet member 100. According to such an integral molding method, not only productivity and economy can be improved, but also a complex shape, it can be easily molded, and the adhesion of each part is enhanced and the sound insulation sheet is excellent in mechanical strength. The member 100 tends to be easily obtained. Also from these viewpoints, it is preferable that the sheet 11, the resonance part 21, and the rib-like protrusion part 31 are an integrally molded product containing a thermosetting elastomer or a thermoplastic elastomer.

[Function and effect]
In the sound insulation sheet members 100 to 102 and the sound insulation structures 200 to 203 of the present embodiment, a plurality of resonance portions 21 are provided in contact with the sheet surface 11a of the sheet 11 having rubber elasticity. Therefore, when sound waves are incident from a noise source, a high sound insulation performance that surpasses the mass law can be obtained. Here, in the sound insulation sheet members 100 to 102 and the sound insulation structures 200 to 201 of the present embodiment, adjustment of the spring constant by changing the shape, density distribution, or material (elastic modulus, mass) of the resonance part 21 and the base part 22 The resonance frequency of the resonance part 21 can be easily controlled by changing the mass of the weight part 23 or the like. Furthermore, the frequency band (acoustic band gap width and frequency position) can be controlled by the material, thickness, and the like of the sheet 11. Therefore, the sound insulation sheet members 100 to 102 and the sound insulation structures 200 to 203 of the present embodiment are superior in the degree of freedom of design and the degree of design of the sound insulation frequency compared to the conventional ones.

  Further, in the sound insulation sheet members 100 to 102 and the sound insulation structures 200 to 201 of the present embodiment, the resonance part 21 and the rib-like projection part 31 are provided in contact with one sheet surface 11a of the sheet 11 having rubber elasticity. It is not provided on the other sheet surface 11b. Therefore, even if the support 51 is a non-flat surface having a curved surface, for example, the flexible sheet 11 that can be expanded and contracted can follow the surface shape, and as a result, the sheet 11 is stabilized on the support 51. Can be installed. Therefore, the sound insulation sheet members 100 to 102 and the sound insulation structures 200 to 201 of the present embodiment are excellent in handleability and versatility compared to conventional ones.

  Moreover, when the sheet | seat 11 and the resonance part 21 are integrally molded, since the several resonance part 21 (resonator) can be installed collectively, productivity and handling property improve exceptionally.

  Since the rib-like protrusion 31 having the maximum height H2 higher than the maximum height H1 of the resonance part 21 is disposed, the sound insulating sheet members 100 to 102 are wound into a sheet shape or a plurality of sheets are overlapped. Even so, the rib-like protrusion 31 functions as a spacer, and the contact of the resonance part 21 with the back surface of the sheet 11 is suppressed. Therefore, it becomes easy to continuously produce and store the sound insulation sheet members 100 to 101 by so-called roll-to-roll without causing manufacturing troubles such as deformation, mutation, cracking, dropping, and breakage of the resonance part 21. Compared with batch production for each sheet, the production speed is improved, and productivity and economy are improved. In addition, although the rib-shaped protrusion part 31 is not described in the sound insulation sheet member 102 of FIGS. 14 and 15, it may be provided, and the same effect can be obtained.

[Sound insulation structure]
The sound insulation sheet member of the present invention can be used as a sound insulation structure. As shown in the above-described embodiment, the sound insulation structure may have a support, a rib-like protrusion, and the like.
In addition, as an example of a method of using the sound insulating sheet member of the present invention, a method of attaching to the inside or the outside of a small electronic device is considered for reducing noise such as motor sound of a small electronic device or switching sound in an electronic circuit. It is done.

The sound insulation structure may be a laminate including the sound insulation sheet member of the present invention. For example, sound insulation sheet members 102 may be provided on both surfaces of the support 51 as shown in a cross-sectional view of the sound insulation structure shown in FIG. Further, a plurality of sound insulation structures each having a sound insulation sheet member provided on a support may be laminated. By combining a plurality of sound insulation sheet members, an acoustic band gap width, a frequency position, and the like can be controlled.
In addition, even a laminated body having a sound insulating sheet member on both sides of a support as shown in FIG. 15, if the support and the casing including the laminated body are flexible, follow a non-flat surface having a curved surface or the like. Therefore, it is possible to stably attach the sound insulation structure.

The positional relationship between the resonance part of the sound insulation sheet member and the sheet when used as the sound insulation structure is not particularly limited, but for example, it can be used as in the cross-sectional view of the structure shown in FIG.
The sound insulation structure 203 in FIG. 16 includes the sheet 11, the resonance part 21, the rib-like protrusion 32, and the sheet 70. The sound insulation structure 203 is installed in a sound insulation structure installation object (for example, a window) 300. When the weight of the sound insulation structure installation object 300 is larger than that of the support, the acoustic band gap is likely to occur because the seat is not directly installed on the sound insulation structure installation object as shown in FIG. May be obtained.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated more concretely, this invention is not limited at all by these. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

[Example 1]
Example 1 is a unit cell including the sound insulating sheet member shown in FIG. 12A, and an acoustic band gap in the unit cell was calculated by the method described in Non-Patent Document 3. In the calculation of the acoustic band gap in the unit cell, the displacement of the opposite surface of the sheet surface of the part iii provided with the part ii of FIG. Table 1 shows the size, material, and physical properties of the constituent members of the unit cell. Table 1 shows the estimated sheet thickness of the sound insulating sheet member or the sound insulating structure and the surface density of the sound insulating sheet member.

[Examples 2 and 3 and Comparative Example 1]
Examples 2 and 3 are unit cells including the sound insulating sheet member shown in FIG. 12B, and the acoustic band gaps in the unit cells were calculated by the same method as in Example 1, respectively. In calculating the acoustic band gap in the unit cell, the displacement of the opposite surface of the sheet surface of the part iii provided with the part ii was fixed. Table 1 shows the size, material, physical properties, and the estimated sheet thickness of the sound insulation sheet member or sound insulation structure and the surface density of the sound insulation sheet member.
Comparative Example 1 is a unit cell including the sound insulating sheet member shown in FIG. 12C, and the acoustic band gap in the unit cell was calculated by the same method as in Examples 2 and 3, respectively. However, in Comparative Example 1, the value obtained by dividing the weight of the sound insulation structure excluding the constituent part iv of the sound insulation structure by the area of the part iv is described as the surface density.

From the comparison between Example 3 and Comparative Example 1, the maximum height H of the sheet member is 3 mm or less while having an acoustic band gap including a sound insulating frequency band of kHz order by controlling the number and the like of the resonance part. It has been confirmed that a thin sound insulation sheet member can be realized.
In addition, a comparison between Examples 1 and 2 confirms that the resonator has a band gap regardless of whether the resonator shape is a cylinder or a prism, and increases the degree of freedom in designing the sound insulation structure. It was. Furthermore, it was confirmed from the comparison between Examples 2 and 3 that the acoustic band gap position can be adjusted by the height of the resonance part.

Furthermore, from the comparison between Examples 1, 2 and 3 and Comparative Example 1, it is possible to design a light-weight sound insulation sheet member having an acoustic band gap and having a surface density of the sound insulation sheet member of 1 kg / m ² or less. It was confirmed that.

DESCRIPTION OF SYMBOLS 11 Sheet 11a Sheet surface 11b Sheet surface 21 Resonance part 22 Base part 23 Weight part 24 Base part 25 Weight part 25a Projection part 25b Projection part 25c Projection part 31 Rib-like projection part 32 Rib-like projection part 51 Support body 61 Mold 61a Cavity 61b Cavity 70 sheet 101 sound insulation sheet member 102 sound insulation sheet member 200 sound insulation structure 201 sound insulation structure 202 sound insulation structure 203 sound insulation structure 300 sound insulation structure installation object H maximum height of sound insulation sheet member H1 maximum height H2 maximum height r1 length R2 radius h height a sheet length
i Weight
ii Base
iii sheet
iv Support

Claims (13)

A sheet having rubber elasticity, and at least a plurality of resonating portions;
The resonance part is provided in contact with the sheet surface of the sheet,
A sound insulating sheet member having a maximum height of 3 mm or less from the opposite surface of the sheet surface provided with the resonance portion to the tip of the resonance portion. The sound insulating sheet member according to claim 1, wherein the sheet contains at least one selected from the group consisting of a heat or photocurable elastomer and a thermoplastic elastomer. The sound-insulating sheet member according to claim 1 or 2, wherein the sheet has a Young's modulus of 0.01 MPa or more and 100 MPa or less. The said sheet | seat and the said resonance part are integrally molded products, and contain both at least 1 sort (s) selected from the group which consists of a heat | fever or photocurable elastomer and a thermoplastic elastomer. The sound insulating sheet member according to one item. The sound insulation sheet member further comprises at least one or more rib-like protrusions;
The rib-shaped protrusion is provided in contact with the sheet surface of the sheet and has a height in the sheet normal direction higher than the resonance part. The sound-insulating sheet member according to 1. The sound insulating sheet member according to claim 5, wherein the rib-like protrusions are provided so as to extend in a sheet length direction of the sheet. The sound insulation sheet member according to claim 5 or 6 in which a plurality of said rib-like projection parts are spaced apart along the sheet length direction of said sheet. The said sheet | seat, the said resonance part, and the said rib-shaped projection part are integral moldings, and contain both at least 1 sort (s) selected from the group which consists of a heat | fever or photocurable elastomer, and a thermoplastic elastomer. The sound insulation sheet member as described in any one of 5-7. The sound insulating sheet member according to any one of claims 1 to 8, and a support, at least,
The sound insulating structure, wherein the support is provided in contact with at least one surface of the sound insulating sheet member and supports the sheet. The sound insulation structure according to claim 9, wherein the support has a Young's modulus of 1 GPa or more. The sound insulation structure which is a laminated body containing the sound insulation sheet member as described in any one of Claims 1-8. The manufacturing method of the sound-insulation sheet | seat member which includes a process below.
(8) A step of applying a photocurable elastomer precursor or a photocurable resin precursor to a mold having a plurality of cavities.
(9) A step of laminating a substrate on the elastomer precursor or resin precursor planarized on the mold.
(10) A step of filling the cavity of the laminate of the support and the mold with the elastomer precursor or the resin precursor by a pressure roll from the substrate side.
(11) By irradiating light from the substrate side, the elastomer precursor or resin precursor on which the cavity shape of the mold has been transferred is cured, and the cured product of the elastomer precursor or resin precursor and the substrate And polymerizing and bonding.
(12) (11) A step of peeling a bonded product of a cured product of the elastomer precursor or resin precursor from a mold. The manufacturing method of the sound-insulation sheet | seat member which includes a process below.
(13) A roll mold having an outer peripheral surface in which a plurality of cavities are arranged is rotated, and the substrate is moved in the rotation direction of the roll mold along the outer peripheral surface of the roll mold, and photocured on the outer peripheral surface of the roll mold. Applying a functional elastomer precursor or a photocurable resin precursor,
Filling the cavity with the elastomer precursor or resin precursor.
(14) A step of irradiating the region between the outer peripheral surface of the roll mold and the substrate with the elastomer precursor or the resin precursor sandwiched between the outer peripheral surface of the roll mold and the substrate. (15) A step of peeling off the bonded product of the cured product of the elastomer precursor or resin precursor obtained in the step (14) and the substrate from the roll mold.

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