JP2020095283A - Sound insulation panel - Google Patents

Abstract

To improve sound insulation properties of a resin structure including therein a plurality of cells arranged in parallel.SOLUTION: A sound insulation panel comprises a hollow plate-ike resin structure 10 including therein cells S having a columnar shape arranged in parallel, and a sheet body 50. The resin structure 10 includes side walls that separate the cells S, and a pair of closing walls that close the upper part and the lower part of the side walls. At least one of the pair of closing walls is a first closing wall in which a communication hole 15 that allows the inside and outside of the cells S to communicate is formed. The communication hole is formed at one or more places different from cell to cell. The sheet body 50 is stacked on the external surface of the first closing wall in the resin structure 10 in which one of the pair of closing walls is the first closing wall, and is stacked on the external surface of at least one of the first closing walls in the resin structure 10 in which both of the pair of closing walls are first closing walls. The sheet body 50 is partially bonded to the external surface of the first closing wall, and has a basis weight of more than or equal to 1000 g/mand a specific gravity of more than or equal to 0.9.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sound insulation panel.

BACKGROUND ART Conventionally, a hollow plate-shaped resin structure in which a plurality of cells each having a polygonal column shape or a columnar shape are arranged side by side is known. For example, in the resin structure described in Patent Document 1, a core layer in which a plurality of hexagonal column-shaped cells are partitioned is formed by folding a sheet material made of a thermoplastic resin having a predetermined shape. Skin layers, which are sheet materials made of a thermoplastic resin, are bonded to both upper and lower surfaces of the core layer.

JP, 2013-163351, A

Since the hollow plate-shaped resin structure described in Patent Document 1 is relatively lightweight and has sufficient strength, it is expected to be used in various applications. However, Patent Document 1 does not mention the use of the resin structure as a sound insulating material. The sound insulation performance of an object is proportional to the logarithm of the product of the mass per unit area and the frequency of sound, but since the resin structure described in Patent Document 1 is relatively lightweight, it is used as a sound insulation material. There is still room for improvement.

In order to solve the above problems, the present invention is a sound insulating panel including a hollow plate-shaped resin structure in which a plurality of pillar-shaped cells are juxtaposed inside, and a sheet structure, wherein the resin structure is While having a side wall portion that partitions the cell into a pillar shape, and a pair of closing walls that close the upper portion and the lower portion of the side wall portion, at least one of the pair of closing walls has a communication hole that communicates the inside and outside of the cell. It is a formed first closing wall, the communication hole is formed at one or a plurality of different positions in each cell, and in the sheet body, one of the pair of closing walls is the first closing wall. In the resin structure having the above-mentioned structure, the resin structure is laminated on the outer surface of the first closing wall, and in the resin structure having both of the pair of closing walls as the first closing wall, the first closing wall. Is laminated on at least one outer surface of the sheet body, the sheet body is partially joined to the outer surface of the first closing wall, and the basis weight of the sheet body is 1000 g/m ² or more, The specific gravity is 0.9 or more.

In the above invention, a communication hole that communicates the inside and outside of the cell is formed in at least one of the upper and lower closing walls that closes the pillar-shaped cell of the resin structure, and the outside of the first closing wall in which the communication hole is formed is formed. The sheet body is laminated on the surface. According to this configuration, since the mass of the entire sound insulation panel is increased by stacking the sheet bodies, in addition to the effect of improving the sound insulation properties of the sound insulation panel, the sheet body is stacked on the first closed wall in which the communication hole is formed. By doing so, the sound insulation is further improved. It is considered that this is because the sheet body vibrates on the first closed wall in which the communication hole is formed, and as a result, the sound insulation is improved more than the increase in the mass of the sheet body.

In the above structure, it is preferable that the communication holes are irregularly formed in the first closed wall.
In the above configuration, it is preferable that the sheet body laminated on the first closing wall is joined to a peripheral edge portion of an outer surface of the first closing wall.

In the above structure, it is preferable that the sheet body is joined to form a space between the sheet body and the first closing wall.
In order to solve the above problems, the present invention is a sound insulating panel including a hollow plate-shaped resin structure in which a plurality of pillar-shaped cells are juxtaposed inside, and a sheet structure, wherein the resin structure is While having a side wall portion that partitions the cell into a pillar shape, and a pair of closing walls that close the upper portion and the lower portion of the side wall portion, at least one of the pair of closing walls has a communication hole that communicates the inside and outside of the cell. It is a formed first closing wall, the communication hole is formed at one or a plurality of different positions in each cell, and in the sheet body, one of the pair of closing walls is the first closing wall. In the resin structure having the above-mentioned structure, the resin structure is laminated on the outer surface of the first closing wall, and in the resin structure having both of the pair of closing walls as the first closing wall, the first closing wall. Is laminated on at least one outer surface of the first closing wall, the sheet body is partially joined to the outer surface of the first closing wall, and the opening edge of the communication hole is formed on the first closing wall. It is characterized in that it is located inside the inner surface.

According to the present invention, it is possible to improve the sound insulation of the hollow plate-shaped resin structure in which a plurality of pillar-shaped cells are arranged side by side.

The partial perspective view of a sound insulation panel. (A) is a partial perspective view of the resin structure, (b) is a β-β line sectional view in (a), and (c) is a γ-γ line sectional view in (a). (A) is a perspective view of the sheet material which comprises the core layer of a resin structure, (b) is a perspective view which shows the state in the middle of folding of the same sheet material, (c) is a perspective view which shows the state which folded the same sheet material. FIG. 6D is a cross-sectional view showing a state in which a communication hole is formed in the resin structure. The schematic diagram which shows the arrangement|positioning state of the sound insulation panel of an Example. The schematic diagram which shows the arrangement|positioning state of the sound insulation panel of an Example.

A sound insulation panel embodying the present invention will be described below with reference to FIGS. 1 and 2.
As shown in FIG. 1, the sound insulation panel of the present embodiment includes a resin structure 10 and a sheet body 50 laminated on the upper surface 10a thereof. The resin structure 10 is formed in the shape of a hollow plate in which a plurality of columnar cells S are arranged side by side, and the upper surface 10a and the lower surface are formed in a rectangular shape. A communication hole 15 that communicates the inside and outside of the cell S is formed in the upper surface 10 a of the resin structure 10. The sheet body 50 is laminated so as to cover the entire upper surface 10a. The sheet body 50 is joined and fixed to the peripheral edge portion of the upper surface 10a of the resin structure 10 by a tacker 70 over the entire periphery of the peripheral edge portion using a tacker.

Hereinafter, each of the resin structure 10 and the sheet body 50 constituting the sound insulation panel of the present embodiment will be described.
As shown in FIG. 2A, the resin structure 10 includes a core layer 20 in which a plurality of cells S are arranged side by side, and sheet-like skin layers 30 and 40 bonded to both upper and lower surfaces thereof. Has been done. As shown in FIGS. 2B and 2C, the core layer 20 is formed by folding one sheet of thermoplastic resin sheet formed into a predetermined shape. The core layer 20 is composed of an upper wall portion 21, a lower wall portion 22, and a side wall portion 23 that stands upright between the upper wall portion 21 and the lower wall portion 22 and divides the cell S into a hexagonal prism shape. Has been done.

As shown in FIGS. 2B and 2C, the cells S partitioned and formed inside the core layer 20 include a first cell S1 and a second cell S2 having different configurations. As shown in FIG. 2B, in the first cell S1, the upper wall portion 21 of the two-layer structure is provided above the side wall portion 23. The layers of the upper wall portion 21 of this two-layer structure are joined to each other. In addition, in the first cell S1, the lower wall portion 22 of the one-layer structure is provided below the side wall portion 23. On the other hand, as shown in FIG. 2C, in the second cell S2, the upper wall portion 21 of the one-layer structure is provided above the side wall portion 23. Further, in the second cell S2, the lower wall portion 22 of the two-layer structure is provided below the side wall portion 23. The layers of the lower wall portion 22 of this two-layer structure are joined to each other. Further, as shown in FIGS. 2B and 2C, the adjacent first cells S1 and the adjacent second cells S2 are partitioned by the sidewall portions 23 having a two-layer structure, respectively. There is.

As shown in FIG. 2A, the first cells S1 are arranged side by side in a row along the X direction, and two adjacent first cells S1 have a hexagonal shape when viewed from above. Share the edge. Similarly, the second cells S2 are juxtaposed so as to form a row along the X direction, and two adjacent second cells S2 share one side of the hexagon when viewed from above. The columns of the first cells S1 and the columns of the second cells S2 are arranged alternately in the Y direction orthogonal to the X direction. The core layer 20 has a honeycomb structure as a whole by the first cells S1 and the second cells S2.

As shown in FIGS. 2A to 2C, a skin layer 30 which is a thermoplastic resin sheet material is bonded to the upper surface of the core layer 20 configured as described above. A skin layer 40, which is a thermoplastic resin sheet material, is joined to the lower surface of the core layer 20. In this embodiment, the upper portion of the side wall portion 23 of the core layer 20 is closed by the upper wall portion 21 of the core layer 20 and the skin layer 30. Therefore, the upper wall portion 21 of the core layer 20 and the skin layer 30 form a closing wall that closes the upper portion of the side wall portion 23. Similarly, the lower portion of the side wall portion 23 of the core layer 20 is closed by the lower wall portion 22 of the core layer 20 and the skin layer 40. Therefore, the lower wall portion 22 of the core layer 20 and the skin layer 40 form a closing wall that closes the lower portion of the side wall portion 23. Note that, in FIGS. 2B and 2C, of the three illustrated cells S, the leftmost cell S is represented as a representative number, but the same applies to the other cells S. ..

As shown in FIGS. 2B and 2C, the upper surface 10 a of the resin structure 10 is provided with a communication hole 15 that allows the inside and the outside of the cell S to communicate with each other. Specifically, as shown in FIG. 2B, in the first cell S1, the communication hole 15 is provided so as to penetrate the skin layer 30 on the upper surface side and the upper wall portion 21 of the two-layer structure. Further, as shown in FIG. 2C, in the second cell S2, the communication hole 15 is provided so as to penetrate the skin layer 30 on the upper surface side and the upper wall portion 21 of the one-layer structure. That is, the communication hole 15 is provided in the closing wall of each cell S that closes the upper portion of the side wall portion 23. Here, the closing wall (the upper surface 10a of the resin structure 10) in which the communication hole 15 is formed corresponds to the first closing wall in the claims.

As shown in FIG. 2( a ), the communication holes 15 are provided at one location at approximately the central portion of the upper closed wall of each cell S. As shown in FIGS. 2B and 2C, the diameter of the opening of each communication hole 15 is set to be equal to or less than the length of one side of the hexagon when the cell S is viewed from above. Specifically, the diameter of the opening of each communication hole 15 is set to a fraction (for example, about 0.5 to 2 mm) of the interval P1 between the centers of the cells S adjacent in the X direction.

Next, the sheet body 50 will be described. The sheet body 50 of the present embodiment is laminated so as to cover the upper surface 10a of the resin structure 10, that is, substantially the entire closing wall in which the communication hole 15 is formed. As the sheet body 50, a commonly known synthetic resin sheet, wood, plywood, metal sheet (metal foil), paper, cloth, gypsum board, or the like can be used. Examples of the synthetic resin sheet include polypropylene (PP), polyvinyl chloride (PVC) and polystyrene (PS), and examples of the metal sheet include a lead sheet.

The thickness of the sheet body 50 is not particularly limited, but is set to a fraction of the thickness of the resin structure 10 to a few tens of minutes (for example, about 1 to 5 mm).
Further, it is preferable that the sheet body 50 having no air permeability is used from the viewpoint of improving sound insulation. From the viewpoint of improving sound insulation, the specific gravity of the sheet body 50 is preferably 0.9 or more, and more preferably 1.4 or more. Similarly, the basis weight of the sheet body 50 is preferably 1000 g/m ² or more, and more preferably 1500 g/m ² or more. When the basis weight of the sheet body 50 is 2000 g/m ² or more, the sound insulation can be more efficiently improved. In particular, it is preferable that the specific gravity of the sheet body 50 is 1.4 or more, and the basis weight is 2000 g/m ² or more, because the sound loss transmitting effect can be remarkably increased in the low frequency region. In addition, the low frequency region mentioned here indicates a region of approximately 200 Hz to 400 Hz. The same applies to the following description.

Next, a method of manufacturing the sound insulation panel will be described with reference to FIG.
The step of manufacturing the sound insulation panel of the present embodiment includes a step of manufacturing the resin structure 10 in which the plurality of communication holes 15 are formed in the upper surface 10a, and a step of joining the sheet body 50 to the upper surface 10a of the resin structure 10. It is composed of First, the process of manufacturing the resin structure 10 will be described.

As shown in FIG. 3A, the first sheet material 100 is formed by molding a sheet of thermoplastic resin into a predetermined shape. In the first sheet material 100, strip-shaped flat areas 110 and bulging areas 120 are alternately arranged in the longitudinal direction (X direction) of the first sheet material 100. In the bulging region 120, a first bulging portion 121 having a downward groove-shaped cross section having an upper surface and a pair of side faces is formed over the entire extending direction (Y direction) of the bulging region 120. The angle between the upper surface and the side surface of the first bulging portion 121 is preferably 90 degrees, and as a result, the cross-sectional shape of the first bulging portion 121 is a downward U-shape. Further, the width of the first bulging portion 121 (the length of the upper surface in the lateral direction) is equal to the width of the flat area 110, and the bulging height of the first bulging portion 121 (the length of the side surface in the lateral direction). ) Is set to be twice as long.

Further, in the bulging region 120, a plurality of trapezoidal second bulging portions 122 whose cross-sectional shape is obtained by dividing the regular hexagon by the longest diagonal line are arranged so as to be orthogonal to the first bulging portion 121. Has been formed. The bulging height of the second bulging portion 122 is set to be equal to the bulging height of the first bulging portion 121. In addition, the interval between the adjacent second bulging portions 122 is equal to the width of the upper surface of the second bulging portion 122.

The first bulging portion 121 and the second bulging portion 122 are formed by partially bulging the sheet upward by utilizing the plasticity of the sheet. Further, the first sheet material 100 can be formed from one sheet by a known forming method such as a vacuum forming method or a compression forming method.

As shown in FIGS. 3A and 3B, the core layer 20 is formed by folding the first sheet material 100 configured as described above along the boundary lines P and Q. Specifically, the first sheet material 100 is valley-folded at the boundary line P between the flat area 110 and the bulging area 120, and the peaks are formed at the boundary line Q between the upper surface and the side surface of the first bulging portion 121. Fold and compress in the X direction. Then, as shown in FIGS. 3B and 3C, the upper surface and the side surface of the first bulging portion 121 fold over and the end surface of the second bulging portion 122 folds over the flat area 110, so that One prismatic partition 130 extending in the Y direction is formed for each bulge region 120. The partition plate 130 is continuously formed in the X direction to form the hollow plate-shaped core layer 20. In addition, in this embodiment, the direction in which the first sheet material 100 is compressed for folding is the direction in which the cells S are arranged in parallel (X direction).

When the first sheet material 100 is compressed as described above, the upper wall portion 21 of the core layer 20 is formed by the upper surface and the side surface of the first bulging portion 121, and the end surface of the second bulging portion 122 and the flat surface. The region 110 forms the lower wall portion 22 of the core layer 20. As shown in FIG. 3C, a portion of the upper wall portion 21 where the upper surface and the side surface of the first bulging portion 121 are folded to form a two-layer structure, and a second bulging portion of the lower wall portion 22. The portions where the end face of 122 and the planar region 110 are folded to form a two-layer structure are the overlapping portions 131.

Further, the hexagonal column-shaped region formed by partitioning the second bulging portion 122 is the second cell S2, and the hexagonal column-shaped region partitioned between the pair of adjacent partition bodies 130 is the first cell S2. It becomes one cell S1. In the present embodiment, the upper surface and the side surface of the second bulging portion 122 configure the side wall portion 23 of the second cell S2, and the side surface of the second bulging portion 122 and the second bulging portion 122 in the bulging region 120. The plane portion located between them constitutes the side wall portion 23 of the first cell S1. Then, the abutting portions of the upper surfaces of the second bulging portions 122 and the abutting portions of the flat portions of the bulging region 120 form the side wall portion 23 having a two-layer structure. Further, in the first cell S1, the upper portion is partitioned by the pair of overlapping portions 131, and in the second cell S2, the lower portion is partitioned by the pair of overlapping portions 131. When carrying out such a folding step, it is preferable that the first sheet material 100 is heat-treated to be in a softened state.

A second sheet material made of a thermoplastic resin is bonded to the upper surface and the lower surface of the core layer 20 thus obtained by thermal welding. The second sheet material joined to the upper surface of the core layer 20 becomes the skin layer 30 and closes the upper wall portion 21 of the core layer 20 and the upper portion of the side wall portion 23. The second sheet material joined to the lower surface of the core layer 20 serves as the skin layer 40 and closes the lower wall portion 22 of the core layer 20 and the lower portion of the side wall portion 23.

When the second sheet material (skin layers 30, 40) is heat-welded to the core layer 20, the upper wall portion 21 (superposition portion 131) of the two-layer structure in the first cell S1 is heat-welded to each other. .. Similarly, the lower wall portion 22 (superposed portion 131) of the two-layer structure in the second cell S2 is heat-welded to each other.

By the above process, a large number of first cells S1 or second cells S2 are arranged in parallel in the X direction, and a large number of first cells S1 and second cells S2 are alternately arranged in the Y direction. The body 10 is obtained.

Next, a large number of communication holes 15 are formed in one closed wall (upper surface 10a) of the resin structure 10. The communication hole 15 is formed by penetrating the upper surface 10a of the resin structure 10 with a penetrating member 60 such as a drill, a needle, or a punch. As shown in FIG. 3D, a plurality of penetrating members 60 are arranged at intervals substantially the same as the intervals between the centers of the adjacent cells S. The resin structure 10 is arranged and fixed on the lower side of the plurality of penetrating members 60, and the penetrating members 60 are moved downward. Thus, on the upper surface 10a of the resin structure 10, one communicating hole 15 is formed at each substantially central portion of each cell S. Through the above steps, the resin structure 10 having the plurality of communication holes 15 formed in the upper surface 10a is manufactured.

Next, a process of manufacturing the sound insulation panel by joining the sheet body 50 to the upper surface 10a (first closing wall) of the resin structure 10 in which the communication hole 15 is formed will be described.
The sheet 50 has substantially the same shape and size as the upper surface 10 a of the resin structure 10. The sheet body 50 is aligned and laminated so as to cover the entire upper surface 10a of the resin structure 10 in which the communication holes 15 are formed. Then, using a tucker, the sheet structure 50 is joined to the resin structure 10 at a plurality of locations by studs 70 over the entire periphery of the peripheral edge portion. Thereby, the sound insulation panel as shown in FIG. 1 is obtained. In the joining by the tacker, the tack 70 may overlap the position where the communication hole 15 is formed, but the joining strength does not become a particular problem because the tacks 70 are joined at a plurality of locations.

Next, the operation of the sound insulation panel of the above embodiment will be described together with its effect.
(1) In the above embodiment, the sheet body 50 is laminated on the upper surface 10a of the resin structure 10 in which the communication holes 15 are formed. Therefore, the sound transmission loss effect is improved, and the sound insulation is improved as compared with the case of the resin structure 10 alone.

In general, the sound transmission loss effect of wall materials made of the same material is proportional to the logarithm of the product of the mass per unit area of the wall material and the frequency of sound. In the sound insulation panel of the above-described embodiment, the sound insulation is improved more than the sound transmission loss effect due to the increase in the mass of the sheet body 50. It is considered that this is an effect due to the film vibration of the sheet body 50 with the upper surface 10a in which the communication hole 15 is formed.

(2) In the above embodiment, the sheet body 50 is partially joined to the peripheral edge portion of the upper surface 10a of the resin structure 10. Therefore, while suppressing the displacement of the sheet body 50, it is possible to preferably exhibit the sound transmission loss effect due to the film vibration of the sheet body 50.

(3) In the above-described embodiment, the communication holes 15 are formed in all the plurality of cells S forming the resin structure 10 at one location. Therefore, the entire sheet body 50 joined to the upper surface 10a of the resin structure 10 easily vibrates. The sound transmission loss effect can be exhibited over the entire sound insulation panel.

(4) In the above embodiment, the resin structure 10 is formed in a hollow plate shape having a plurality of cells S, and the communication hole 15 is formed in each cell S. Therefore, sound pressure enters the internal space of each cell S through the communication hole 15, and the sound pressure can be effectively reduced in the internal space. That is, each cell S of the resin structure 10 can function as a so-called “Helmholtz resonator”. The function of each cell S as the “Helmholtz resonator” promotes the vibration of the sheet body 50, and the sound transmission loss effect of the entire sound insulation panel is improved.

The above embodiment may be modified as follows, or the following modifications may be combined and applied.
In the above embodiment, the plurality of communication holes 15 are formed only on the upper surface 10a of the resin structure 10, but the plurality of communication holes 15 may be formed on both the upper surface 10a and the lower surface of the resin structure 10. In this case, in one cell S, the communication hole 15 may be formed in both the upper closing wall and the lower closing wall, or may be formed in only one of them.

In the above embodiment, the plurality of communication holes 15 are formed only on the upper surface 10a of the resin structure 10 and the sheet body 50 is laminated only on the upper surface 10a in which the communication holes 15 are formed, but the present invention is not limited to this. When the plurality of communication holes 15 are formed on both the upper surface 10a and the lower surface of the resin structure 10, the sheet body 50 may be laminated on either surface, or the sheet body 50 may be laminated on both surfaces. .. When the sheet body 50 is laminated on both surfaces, the entire resin structure 10 may be wrapped with the sheet body 50.

In the above-described embodiment, the communication hole 15 is formed at one location in the substantially central portion of each cell S, but the location and number of the communication holes 15 are not limited to this. Further, in the above embodiment, the communication holes 15 are regularly formed in the entire resin structure 10, but the communication holes 15 may be formed irregularly. For example, the communication hole 15 may be formed in one place at a different place in each cell S, or may be formed in a plurality of places. Further, the cells S in which the communication holes 15 are formed and the cells S in which the communication holes 15 are not formed are mixed, or the communication holes 15 are localized in a part of the upper surface 10a or the lower surface of the resin structure 10. You may.

-In the said embodiment, although the sheet|seat body 50 was joined in multiple places over the perimeter of the peripheral part of the upper surface 10a of the resin structure 10, the number of joining parts and joining places is not limited to this. The resin structure 10 may be bonded to the four corners of the upper surface 10a, or the inner surface of the upper surface 10a may be provided with bonding portions. The point is that the entire sheet body 50 need not be in a mode in which the entire sheet body 50 is bonded and adhered to the entire upper surface 10a of the resin structure 10.

In the above embodiment, the sheet body 50 is joined to the peripheral edge portion of the upper surface 10a of the resin structure 10 by the tacker tack 70, but the joining method is not limited to this. You may adhere with a double-sided tape or an adhesive agent. Further, a pair of outer frames having a shape along the peripheral portions of the resin structure 10 and the sheet body 50 may be formed so that the resin structure 10 and the sheet body 50 are sandwiched between the pair of outer frames. The peripheral portions of the body 10 and the sheet body 50 may be sandwiched by a plurality of frames. Alternatively, a frame body formed by combining thin rod bodies in a lattice shape may be placed on the sheet body 50 and joined to the resin structure 10 together with the sheet body 50.

In the above-described embodiment, the sheet body 50 is directly laminated and bonded on the upper surface 10a of the resin structure 10, but the invention is not limited to this. Nonwoven fabric or the like may be laminated on the upper surface 10a of the resin structure 10 and the sheet body 50 may be bonded thereon, or a space may be formed between the upper surface 10a of the resin structure 10 and the sheet body 50. The sheet bodies 50 may be stacked and joined together.

-In above-mentioned embodiment, although the upper surface 10a and the lower surface of the resin structure 10 were formed in rectangular shape, it is not limited to this. It may have a polygonal shape such as a triangular shape or a pentagonal shape, a perfect circular shape, an elliptic circular shape, or an irregular shape.

In the above embodiment, the sheet body 50 is formed to have substantially the same size and shape as the upper surface 10a of the resin structure 10, but the present invention is not limited to this. It may be larger or smaller than the upper surface 10a of the resin structure 10. Also, the shape of the sheet body 50 can be different from the shape of the upper surface 10 a of the resin structure 10. Therefore, it is not necessary to have the size and shape that cover the entire upper surface 10a of the resin structure 10.

In the above embodiment, the sheet body 50 is formed to have substantially the same size as the upper surface 10a of the resin structure 10 and one sheet body 50 is stacked on the upper surface 10a, but the present invention is not limited to this. Two sheets formed to be half the size of the upper surface 10a may be stacked side by side, or a plurality of sheet bodies 50 may be stacked side by side to cover the upper surface 10a of the resin structure 10.

When the sheet body 50 is made of a synthetic resin material, a synthetic resin material to which various functional resins are added may be used. For example, it is possible to add a flame retardant resin to a thermoplastic resin to enhance the flame retardancy. It is also possible to increase the specific gravity by mixing talc or an inorganic material.

The material of the core layer 20 and the skin layers 30 and 40 may be any synthetic resin material. Further, various functional resins may be added as in the case of the sheet body 50. Even if a part of the resin structure 10 contains a material other than synthetic resin, if most of the material is synthetic resin, it can be said that it is the resin structure 10.

The resin structure 10 is not limited to forming the core layer 20 by folding and molding one sheet of the first sheet material 100, and the core layer may be formed by using a plurality of sheets of the first sheet material. For example, the core layer may be formed by bending the strip-shaped first sheet material at predetermined intervals and arranging the plurality of first sheet materials in parallel. In the case of this modification, the bent portion of each first sheet material constitutes the side wall portion of the cell.

In the above embodiment, the resin structure 10 has a structure in which a plurality of cells S are arranged in parallel by folding a sheet material, but the present invention is not limited to this. You may use the hollow plate material of the structure formed in the harmonica shape by extrusion molding.

The shape of the cell S is not particularly limited to the hexagonal prism shape. For example, the shape may be a columnar shape, or a polygonal pillar shape such as a square pillar shape or an octagonal pillar shape. Further, the shape of the cell S may be, for example, a frustum shape or a shape in which frustum-shaped top surfaces are abutted with each other. That is, any shape may be used as long as it has a pillar shape as a whole. Furthermore, cells S having different shapes may be mixed in the core layer 20, or the cells S may not be adjacent to each other and a space (gap) may be formed between the cells S. When there is a space (gap) between the cells S and the cells S, the communication hole 15 is not only formed in a portion that communicates the inside and outside of the cells S, but also the cells S and the cells S. It may be formed in the space between them.

In the above embodiment, the resin structure 10 is configured such that the skin layers 30 and 40 are laminated on the core layer 20 formed by folding the sheet material and then the communication hole 15 is formed. However, the present invention is not limited to this. .. For example, after the core layer 20 is formed by extrusion molding, the skin layers 30 and 40 in which a plurality of communication holes 15 are formed in advance may be laminated on the core layer 20.

The skin layers 30 and 40 are not limited to being joined to the core layer 20 by heat welding, but the skin layers 30 and 40 may be attached to the core layer 20 with an adhesive or the like for joining. Further, an adhesive layer made of, for example, a thermoplastic resin may be interposed between the core layer 20 and the skin layers 30 and 40, and the skin layers 30 and 40 may be bonded to the core layer 20 by the adhesive force of the adhesive layer. ..

In the above embodiment, the direction in which the core layer 20 is folded and compressed (X direction) has been described as the direction in which the cells S are arranged in parallel, but this is only an example. For example, in FIG. 2A, adjacent cells S share one side of a hexagon and are arranged side by side even in the directions inclined by 30° and 60° with respect to the X direction. I can say. In addition, in the case of a structure other than the honeycomb structure, even if one side of the polygon is not shared or there is some deviation, if cells are arranged in a row as a whole, it can be said that cells are arranged in parallel.

As the sound insulation panel, a sheet body 50 on which a cloth, paper, metal sheet or the like is further wound may be laminated and used. Moreover, you may wind and use cloth, paper, a metal sheet, etc. on a sound insulation panel.

Next, a test of the sound transmission loss effect of the sound insulation panel of the present invention will be described.
[Test 1]
In Test 1, the sound transmission loss effect obtained by joining the sheet body 50 to the surface of the resin structure 10 on the side where the communication hole 15 was formed was evaluated.

The sound transmission loss was measured according to JIS-A1416. The same applies to the measurement of sound transmission loss in Tests 2 to 7 below.
Specifically, a sound insulation panel as a test body was placed between two reverberation rooms (a sound source room and a sound reception room) (partition wall opening), and sound transmission loss was measured to evaluate sound insulation. Random noise was output from the sound source room side, and the average sound pressure level of the sound that was sufficiently diffused in the sound source room and the average sound pressure level of the sound that was transmitted through the test body and radiated to the sound receiving room side were measured. In addition, the reverberation time of the sound receiving room was measured, and the sound transmission loss R (dB) was calculated by the following equations (1) and (2).

A=0.16V/T (1)
R=L ₁ −L ₂ +10 log ₁₀ S/A (2)
L ₁ ; Room average sound pressure level in the sound source room (dB)
L ₂ ; Room average sound pressure level (dB) in the sound receiving room
S: Area (m ² ) of the test body having the same size as the opened test opening
A: Equivalent sound absorption area (m ² ) of the sound receiving room
V: Volume of sound receiving chamber (m ³ )
T: Reverberation time (sec) in the receiving room
FIG. 4 shows a schematic view of the arrangement state of the sound insulation panel. Each of the resin structures 10 constituting the sound insulation panel had a thickness of 30 mm and had a communication hole 15 having a diameter of 1.0 mm formed on only one surface thereof. The condition 1A (FIG. 4A) is that only the resin structure 10 is arranged between the sound source chamber and the sound receiving chamber with the communication hole 15 facing the sound source side. Condition 1B (FIG. 4B) is that the sheet body 50 faces the sound source side in the sound insulation panel in which the sheet body 50 of the same shape is joined to the peripheral edge portion of the surface of the resin structure 10 where the communication hole 15 is formed. So that Condition 1C (FIG. 4C) is the same sound insulation panel as that of Condition 1B, and the sheet body 50 is arranged so as to face the sound receiving side. Condition 1D (FIG. 4(d)) is a sound insulation panel in which a sheet body 50 of the same shape is joined to the peripheral portion of the surface of the resin structure 10 on which the communication hole 15 is not formed, and the sheet body 50 has the sound receiving side. Arranged so that it faces. Each of the joined sheet bodies 50 is a vinyl chloride sheet and has a thickness of 1.2 mm. Table 1 shows the configuration and arrangement of each sound insulation panel. In Table 1, the term “closed side” on the laminated side of the sheet body 50 means the side on which the communication hole 15 is not formed in the resin structure 10.

The following results were obtained from Test 1. From the results of Condition 1A and Condition 1D, in the case where the sheet body 50 is joined to the surface of the resin structure 10 on which the communication hole 15 is not formed, the acoustic loss transmission is slightly over the entire frequency range as compared with the resin structure 10 alone. The effect was improved. Under the condition 1D, it is considered that the sound loss transmission effect is slightly improved due to the influence of the increase in the mass of the sheet body 50. On the other hand, from the results of Condition 1A and Condition 1B, in Condition 1B, a significant increase in the sound loss transmission effect was observed from the low frequency region. Similar results were also obtained under the condition 1C.

From these, it is found that the sound insulation is improved more than the sound transmission loss effect due to the increase in the mass of the sheet body 50 by joining the sheet body 50 to the surface of the resin structure 10 where the communication hole 15 is formed. It was Further, in the case where the sheet body 50 is joined to the surface of the resin structure 10 in which the communication hole 15 is formed, the same applies regardless of whether the sheet body 50 is installed on the sound source room side or the sound receiving room side. It was found that a certain degree of sound transmission loss effect can be obtained.

[Test 2]
In Test 2, with respect to the resin structure 10 constituting the sound insulation panel, the sound transmission loss effect due to the hollow volume of the cell S formed in the resin structure 10 and the diameter of the communication hole 15 formed in the resin structure 10 was evaluated. ..

As a result, the larger the hollow volume of the cell S formed in the resin structure 10, the larger the sound loss transmitting effect from the low frequency region. The hollow volume of the cell S is preferably 1000 mm ³ or more, and more preferably 2000 mm ³ or more. When it was 3000 mm ³ or more, the sound insulation could be more efficiently improved. In particular, when the hollow volume of the cell S was 3000 mm ³ or more, a remarkable increase in the acoustic loss transmitting effect was observed from the low frequency region. This effect was the same whether the sheet 50 (communication hole 15) was arranged on the sound source side or the sound receiving side.

Moreover, the smaller the diameter of the communication hole 15 formed in the resin structure 10, the greater the sound loss transmitting effect from the low frequency region. The diameter of the cell S is preferably 0.3 to 3.0 mm, and more preferably 0.75 to 2.0 mm.

[Test 3]
In Test 3, the sound transmission panel was evaluated for the sound transmission loss effect by using the sound insulation panel in which the communication holes 15 were formed on both surfaces of the resin structure 10 constituting the sound insulation panel. FIG. 5 shows a schematic diagram of the arrangement state of the sound insulation panel.

As the resin structure 10 and the sheet body 50 constituting the sound insulation panel, the same ones were used in FIGS. 5A to 5C. FIG. 5(a) shows a structure in which only the resin structure 10 is arranged between the sound source chamber and the sound receiving chamber, and FIG. 5(b) shows a sound insulation in which the sheet body 50 is joined to one surface of the resin structure 10. A panel is arranged with the sheet body 50 facing the sound receiving side, and FIG. 5C shows a sound insulation panel in which the sheet body 50 is joined to both surfaces of the resin structure 10.

As a result, for the resin structure 10 in which the communication holes 15 are formed on both surfaces, the acoustic loss effect is increased by stacking the sheet body 50 on one surface, and by stacking the sheet body 50 on both surfaces, Furthermore, the sound transmission loss effect was increased. In addition, the sound transmission loss effect increased from the low frequency region in the case where the sheet bodies 50 were laminated on both surfaces, compared to the case where the sheet bodies 50 were laminated only on one surface.

[Test 4]
In Test 4, the sound transmission loss effect due to the difference in basis weight of the sheet body 50 constituting the sound insulation panel was evaluated. The same resin structures 10 constituting the sound insulation panel were used, and the sheet bodies 50 having different basis weights were laminated.

As a result, the larger the basis weight of the sheet body 50, the greater the sound transmission loss effect from the low frequency region. From the viewpoint of increasing the sound transmission loss effect and suppressing the mass of the entire sound insulation panel within a suitable range, the basis weight of the sheet body 50 is preferably 1000 g/m ² or more, and 1500 g/m ² or more. It is more preferable that the amount is 2000 g/m ² , and it is further preferable that the amount is 2000 g/m ² . Further, from the viewpoint of suitably vibrating the sheet body 50, the Young's modulus of the sheet body 50 is preferably 50 MPa or more, and more preferably 90 MPa or more. Particularly, when the basis weight of the sheet body is 2000 g/m ² or more, or when the Young's modulus is 90 MPa or more, a remarkable increase in the sound loss transmitting effect was observed from the low frequency region.

[Test 5]
In Test 5, the sound transmission loss effect by the method of joining the sheet body 50 to the resin structure 10 was evaluated.

As a result, when the sheet body 50 is partially joined to the resin structure 10, the sound transmission loss effect is increased as compared with the case where the entire body is joined. It has been found that the acoustic effect loss effect can be increased by setting the bonding area of the sheet body 50 to be small and causing the sheet body 50 to vibrate on the resin structure 10.

S... Cell, S1... First cell, S2... Second cell, 10... Resin structure, 10a... Top surface, 15... Communication hole, 20... Core layer, 21... Upper wall portion (closed wall), 22... Lower wall Part (closed wall), 23... Side wall part, 30... Skin layer (closed wall), 40... Skin layer (closed wall), 50... Sheet body, 60... Penetrating member.

Claims (5)

A sound insulation panel having a hollow plate-shaped resin structure in which a plurality of pillar-shaped cells are arranged side by side, and a sheet body,
The resin structure includes a side wall portion that divides the cell into a pillar shape, and a pair of closing walls that closes an upper portion and a lower portion of the side wall portion, and at least one of the pair of closing walls is inside or outside the cell. A first closing wall having a communication hole for communicating
The communication hole is formed at one or a plurality of different locations in each cell,
In the resin structure in which one of the pair of closing walls is the first closing wall, the sheet body is laminated on the outer surface of the first closing wall, and both of the pair of closing walls are In the resin structure having the first closing wall, the resin structure is laminated on at least one outer surface of the first closing wall,
The sheet body is partially joined to an outer surface of the first closing wall,
A sound insulation panel, wherein the basis weight of the sheet body is 1000 g/m ² or more and the specific gravity is 0.9 or more. The sound insulation panel according to claim 1, wherein the communication holes are irregularly formed on the first closing wall. The sound insulation panel according to claim 1, wherein the sheet body is joined to a peripheral portion of an outer surface of the first closing wall. The sound insulation panel according to any one of claims 1 to 3, wherein the sheet body is joined so as to form a space with the first closing wall. A sound insulation panel having a hollow plate-shaped resin structure in which a plurality of pillar-shaped cells are arranged side by side, and a sheet body,
The resin structure includes a side wall portion that divides the cell into a pillar shape, and a pair of closing walls that closes an upper portion and a lower portion of the side wall portion, and at least one of the pair of closing walls is inside or outside the cell. A first closing wall having a communication hole for communicating
The communication hole is formed at one or a plurality of different locations in each cell,
In the resin structure in which one of the pair of closing walls is the first closing wall, the sheet body is laminated on the outer surface of the first closing wall, and both of the pair of closing walls are In the resin structure having the first closing wall, the resin structure is laminated on at least one outer surface of the first closing wall,
The sheet body is partially joined to an outer surface of the first closing wall,
The opening edge of the said communication hole is located inside the inner surface of the said 1st obstruction wall, The sound insulation panel characterized by the above-mentioned.