JP2005067148A - Laminated composite plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated composite plate by which noises or the like can be absorbed. <P>SOLUTION: The laminated composite plate 1 is composed of a core material 2 made of resin foam, a surface material 3 provided to the surface side of the core material 2, and a rear face material 4 provided to the rear face side of the core material 2. At least one or more recessed parts 5, which have a bottom face part 5A and a wall face part 5B extended from the bottom face part 5A, are formed from the surface material 3 side toward the core material 2. The core material 2 is exposed at the wall face part 5B. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a laminated composite plate, and particularly relates to a laminated composite plate having particularly good sound absorption.

  Conventionally, as a panel-like material used for building materials, vehicles, marine materials, some machine parts, daily necessities, etc., it is laminated on both sides of the core material in order to satisfy the demand for light weight As the metal plate to be used, aluminum, iron, stainless steel plate, titanium and other metals have been widely used.

  As such a panel-shaped material, for example, a high-density polyethylene and a low-density polyethylene are mixed, and a high-temperature foaming agent and a low-temperature foaming agent are added thereto and heated and foamed, so that at least the core of the foamed resin is obtained. A laminated composite plate is disclosed in which a thin stainless steel plate is hot-pressure bonded to a surface of a sheet-like core material in which a large number of small spherical bubbles are mainly dispersed and distributed on the surface layer portion of the material through an adhesive resin film. (See Patent Document 1).

JP 2000-225664 A (Claim 1)

  The laminated composite plate described in Patent Document 1 can be a laminated composite plate excellent in rigidity, smoothness, and lightness.

  On the other hand, as a panel-like material, in addition to the rigidity, smoothness, and lightness described above, it is also desired to mute external noise and the like. However, since the laminated composite plate described in Patent Document 1 has only a stainless steel plate bonded to the surface, it is difficult to say that it has a sound absorbing function, and it is difficult to mute external noises and the like. There is a problem.

  It is an object of the present invention to provide a laminated composite plate that can eliminate such conventional problems and can mute noise and the like.

  In order to achieve the above object, the laminated composite plate of the present invention includes a core material made of foamed resin, a surface material provided on the surface side of the core material, and a back surface side of the core material. At least one recess having a bottom surface portion and a wall surface portion extending from the bottom surface portion is formed from the surface material side toward the core material. The core material is exposed.

  In the laminated composite board of the present invention, the occupied area of the recesses is preferably 30 to 64% of the surface area of the surface material.

  In the laminated composite board of the present invention, it is preferable that the bottom surface portion reaches 20 to 70% of the thickness of the core material from the surface of the core material toward the back material side from the surface material side. .

  ADVANTAGE OF THE INVENTION According to this invention, the laminated composite board which can mute noise etc. can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show a laminated composite plate 1 according to an embodiment of the present invention. Here, FIG. 1 is a perspective view of the laminated composite plate 1, and FIG. 2 is a cross-sectional view of the laminated composite plate 1.

[Laminated composite board]
As shown in FIGS. 1 and 2, the laminated composite plate 1 includes a core material 2 made of foamed resin, a surface material 3 provided on the surface side of the core material 2, and a back surface provided on the back surface side of the core material 2. At least one concave portion 5 having a bottom surface portion 5A and a wall surface portion 5B extending from the bottom surface portion 5A from the surface material 3 side toward the core material 2 is formed. In 5B, the said core material 2 is exposed.

The thickness T ₁ of the laminated composite plate 1 is preferably in the range of 1.5 to 5.0 mm as shown in FIG. Here, the thickness T ₁ of the laminated composite plate 1 is less than 1.5 mm, there is a case the strength of the laminated composite plate 1 is not sufficient. The thickness T ₁ of the composite plate 1 is more than 5.0 mm, the laminated composite plate 1 itself becomes heavy, there is a case where a problem in workability such installation work arises.

  As shown in FIGS. 1 and 2, the core material 2 is formed by mixing high-density polyethylene and low-density polyethylene, adding a foaming agent capable of forming closed cells, and heating and foaming them. The core material 2 may be a mixture of high-density polyethylene and low-density polyethylene or a foaming agent added to other thermoplastic resins such as polypropylene, polystyrene, and ethylene vinyl alcohol. It may be formed by adding a dispersing agent and heating and foaming.

  Here, as an example, a known high density polyethylene having a specific gravity of about 0.94 to 0.96 can be employed as the high density polyethylene. On the other hand, as the low density polyethylene, a known low density polyethylene having a specific gravity of about 0.91 to 0.93 can be employed.

  The core material 2 is formed by heating and foaming the above high-density polyethylene or the like, but the expansion ratio at the time of heating and foaming may be changed according to the required specifications of the product.

The thickness _{T 2} of the core member 2, as shown in FIG. 2, is preferably in the range of 1.1～4.94Mm.

Here, the thickness T ₂ of the core member 2 is less than 1.1 mm, too small a height of the wall portion 5B of the core member 2 is exposed, the effect of sound absorption can not be obtained . The thickness T ₂ of the core member 2 is more than 4.94Mm, there are cases where the desired effect, the manufacturing cost of the core material 2 is too high.

  Moreover, the material of the surface agent 3 and the back surface agent 4 should just be a well-known aluminum, stainless steel plate, titanium, steel plate, copper, and other thin metal which has the rigidity which can be actually used.

As shown in FIG. 2, the thicknesses T ₃ and T ₄ of the surface agent 3 and the back agent 4 are preferably in the range of 0.03 to 0.50 mm. When the thicknesses T ₃ and T _{4 of the} surface agent 3 and the back agent 4 are less than 0.03 mm, the strength of the laminated composite board 1 may not be sufficient. If the thicknesses T ₃ and T _{4 of the} surface agent 3 and the back agent 4 exceed 0.50 mm, the laminated composite plate 1 becomes heavy, which may cause problems in workability such as attachment work.

  In the laminated composite plate of the present invention, when the bottom surface portion 5A is viewed in plan, the bottom surface portion 5A has various shapes such as a circle, an ellipse, a triangle, a quadrangle, a pentagon, a hexagon, and a star. In particular, the shape of the bottom surface portion 5A is preferably circular.

  Further, in the laminated composite plate of the present invention, as shown in FIG. 2, when the bottom surface portion 5A is viewed in cross section, the bottom surface portion 5A is flat. The bottom surface portion 5A is not limited to being flat, and may be convex upward as shown in FIG. FIG. 3 is a cross-sectional view illustrating a modified example of the bottom surface portion of the laminated composite plate 1.

  Various arrangements such as a staggered arrangement (the inclination between the respective depressions 5 in the staggered arrangement is not limited), a parallel arrangement, and the like can be adopted as the arrangement of at least one recessed section 5 formed.

  In the laminated composite board 1 of the present invention, as shown in FIGS. 1 and 2, the occupied area of the recess 5 is preferably 30 to 64% of the surface area of the surface material 3.

  Here, if the occupied area of the recess 5 is less than 30% of the surface area of the surface material 3, the sound absorption effect may not be sufficient. If the occupied area of the recess 5 exceeds 64% of the surface area of the surface material 3, the strength of the surface material 3 may not be maintained.

In the laminated composite board 1 of the present invention, as shown in FIG. 2, the bottom surface portion 5A has a thickness T ₂ of the core material ₂ of 20 from the surface of the core material 2 toward the back material 4 side from the surface material 3 side. It is preferable to reach to 70%.

Here, in the bottom surface portion 5A, the thickness of the bottom surface portion 5A from the surface of the core material 2 is adjusted according to the required performance from the surface material 3 side toward the back material 4 side. If not reached only from the surface of the core member 2 to less than 20% of the thickness T ₂ of the core member 2, the height of the wall portion 5B of the core member 2 is exposed is too small, the effect of sound absorption can give It may not be possible.

[Procedure for manufacturing laminated composite plates]
As a manufacturing procedure of the laminated composite board 1 according to the present invention, a manufacturing procedure described in detail in paragraphs [0009] to [0052] of Japanese Patent Laid-Open No. 2000-225664 can be employed. The manufacturing procedure of the laminated composite plate 1 will be described below in summary. The manufacturing procedure of the laminated composite plate 1 includes the manufacturing process of the core material 2, the bonding and shrinking process of the adhesive resin film, the surface material 3 and Examples include an adhesive lamination step of the back material 4, an additional heating step for the laminated composite plate 1, a slow cooling step for the laminated composite plate 1, and a concave portion forming step for forming the concave portion 5 of the laminated composite plate 1 according to the present invention. . The manufacturing process other than the recess forming process is omitted.

[Recess formation process]
A concave portion 5 is formed on the surface composite 3 side in the obtained laminated composite plate 1 (see FIG. 1). As formation of this recessed part 5, the method of applying a pressing force to the surface of the surface material 3 by well-known punching is mentioned. The shape, size, arrangement, and the like of the recess 5 are as described above.

[Operation of laminated composite board]
FIG. 4 is a schematic diagram for explaining the operation of the laminated composite plate 1, and FIG. 5 is an enlarged schematic view of the wall surface portion 5 </ b> B when explaining the operation of the laminated composite plate 1. As shown in FIGS. 4 and 5, when the sound wave S due to noise from the outside reaches the bottom surface portion 5 </ b> A of the recess 5, the bottom surface portion 5 </ b> A reaches the surface of the core member 2. Is absorbed by the foamed resin constituting the core material 2. Further, the sound wave S that cannot be absorbed by the bottom surface portion 5 </ b> A and reflected by the bottom surface portion 5 </ b> A is attenuated by colliding with the wall surface portion 5 </ b> B of the recess 5.

  Specifically, as shown in FIG. 5, a large number of minute bubbles of the core material 2 are present on the wall surface portion 5 </ b> B of the recess 5. The sound wave S reflected by the bottom surface portion 5A enters into these many bubbles and attenuates. In this way, noise and the like can be silenced.

Further, the minute bubbles existing in the wall surface portion 5B will be considered. First, considering the recess 5 as one unit, for example, as an example, the diameter D ₁ (see FIG. 2) of the recess 5 is 3.0 mm, the depth L ₁ (see FIG. 2) is 1.0 mm, and 30 degrees. It is assumed that the staggered arrangement and the pitch between the recesses 5 are 12 mm. Recess 5 of one unit is, 1 m ² per is calculated to be 24,600 pieces / ^{m 2.}

  Next, the area of the wall surface portion 5B of the concave portion 5 of one unit is obtained as follows.

Area of wall surface portion 5B = 2π × 1.5 [mm] × 1.0 [mm]
= 9.42 [mm ² / piece]
Therefore, the total area of the wall surface portion 5B of the concave portion 5 per 1 m ² is obtained as follows.

Total area of wall surface portion 5B = 24,600 [pieces /] × 9.42 [mm ² / piece]
= 231,732 [mm ² / m ² ]
According to the research so far, it is estimated that the ratio of minute bubbles to the cross section of the core material 2 is about 30%. Therefore, the area occupied by the bubbles in all the wall surface parts 5B of the recessed part 5 per 1 m ² is obtained as follows.

Area occupied by bubbles in all wall surfaces 5B = 231,732 [mm ² / m ² ] × 0.3
= 69,520 [mm ² / m ² ]
Further, if the average diameter of the bubbles in the core material 2 is estimated to be 0.11 mm and the average radius is 0.055 mm based on the research so far, the cross-sectional area of the bubbles in the core material 2 is obtained as follows.

Cross-sectional area of bubbles in the core material 2 = π × (0.055) ² = 0.0095 [mm ² / piece]
Therefore, the number of bubbles present in all wall surfaces 5B per 1 m ² is obtained as follows.

Number of bubbles present = 69,520 [mm ² / m ² ] ÷ 0.0095 [mm ² / piece]
= 7,319,008 [pieces / m ² ]

As described above, the number of bubbles existing in the entire wall surface portion 5B per 1 m ² is also 7,319,008 [pieces / m ^2], by the sound waves from entering these one by one, and to attenuate the sound waves . Therefore, the sound is absorbed and noise can be silenced.

  In the present invention, the core material 2 is exposed at the wall surface portion 5B of the concave portion 5, and the core material 2 is made of a foamed resin, so that a large number of bubbles are present. That is, according to the present invention, the noise such as noise is silenced by utilizing the fact that the pores such as the bubbles of the core material 2 absorb sound well.

According to this embodiment as described above, the following effects are obtained.
(1) At least one or more recesses 5 having a bottom surface portion 5A and a wall surface portion 5B extending from the bottom surface portion 5A are formed, and in the wall surface portion 5B, the core material 2 is exposed, so that from the outside. When the sound wave S due to the noise reaches the bottom surface part 5A of the recess 5, the bottom surface part 5A reaches the surface of the core material 2, so that the sound wave S from the outside is the foamed material constituting the core material 2. Absorbed by resin. Further, the sound wave S that cannot be absorbed by the bottom surface portion 5A and reflected by the bottom surface portion 5A collides with the wall surface portion 5B of the concave portion 5, so that the sound waves enter the bubbles existing in the core material 2 and attenuate. Therefore, noise and the like can be silenced.

(2) When the core material 2 is formed by mixing high-density polyethylene and low-density polyethylene and adding a foaming agent capable of forming closed cells to heat-foam, obtain foamed cells with small particles. Since the foamed bubbles can be dispersed substantially uniformly in the surface layer portion of the core material 2, the smoothness of the laminated composite plate 1 can be improved. Further, by adding a stabilizer and a dispersant, which are one method of foaming means, the state of foamed bubbles is further stabilized and the foamed bubbles are dispersed, so that the smoothness of the laminated composite plate 1 is further improved. be able to.

(3) For the core material 2, the front surface material 3, and the back surface material 4, a resin obtained by modifying the same kind of resin as the thermoplastic resin constituting the core material 2 is used. There is a method in which this resin is directly laminated on a metal plate by an extrusion die, but it is more cost effective to form a film in a separate process.

(4) When the front surface material 3 and / or the back surface material 4 is made of an aluminum alloy or a stainless steel plate, the laminated composite plate 1 can be lightweight and have high rigidity.

(5) When the surface material 3 and / or the back material 4 is made of stainless steel, the laminated composite plate 1 has a high rigidity and exhibits an excellent function in terms of durability, withstand pressure load, tensile strength, bending Strength, bending elastic modulus, and heat distortion temperature can be improved.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications and improvements within a scope that can achieve the object of the present invention are included in the present invention. In addition, the specific structure, shape, and the like when carrying out the present invention may be other structures and the like as long as the object of the present invention can be achieved.

  The laminated composite board according to the present invention can be used for ceiling materials, floor materials, wall materials and the like that are expected to have a soundproofing effect.

FIG. 1 is a perspective view of a laminated composite board according to the present invention. FIG. 2 is a cross-sectional view of the laminated composite plate according to the present invention. FIG. 3 is a cross-sectional view illustrating a modified example of the bottom surface portion of the laminated composite plate according to the present invention. FIG. 4 is a schematic view for explaining the operation of the laminated composite plate according to the present invention. FIG. 5 is an enlarged schematic view of a wall surface when explaining a laminated composite board according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated composite board 2 Core material 3 Surface material 4 Back surface material 5 Recessed part 5A Bottom face part 5B Wall surface part

Claims (3)

A core material made of foamed resin, a surface material provided on the front surface side of the core material, and a back material provided on the back surface side of the core material,
From the surface material side toward the core material, at least one recess having a bottom surface portion and a wall surface portion extending from the bottom surface portion is formed,
The laminated composite board, wherein the core material is exposed at the wall surface portion.   The laminated composite board according to claim 1, wherein an occupation area of the concave portion is 30 to 64% of a surface area of the surface material. The said bottom face part has reached 20 to 70% of the thickness of the said core material from the surface of the said core material toward the said back material side from the said surface material side to the said Claim 1 or Claim 2. The laminated composite board described.

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