WO2009028897A2

WO2009028897A2 - Bonded steel plate having excellent sound-absorbing, virbration-damping and processability

Info

Publication number: WO2009028897A2
Application number: PCT/KR2008/005074
Authority: WO
Inventors: Hae-Sik Lee
Original assignee: Haewon Msc Co., Ltd.
Priority date: 2007-08-31
Filing date: 2008-08-29
Publication date: 2009-03-05
Also published as: WO2009028897A8; KR100861448B1; JP2010516511A; WO2009028897A3; CN101557932A; CN101557932B

Abstract

A bonded plate, which has excellent sound-absorbing, vibration-damping, and processability. The bonded plate includes a surface plate, a backing plate backing the surface plate, and an adhesive resin interposed between the surface plate and the backing plate and bonding the surface plate and the backing plate with each other, wherein the adhesive resin has a thickness from about 0.02 mm to about 0.1 mm. Thereby, the adhesive resin layer of the bonded plate can have sound-absorbing and vibration-damping functions. Further, the bonded plate can remarkably reduce the cost of production and can secure formability equal to that of the conventional steel plate.

Description

[DESCRIPTION] [Invention Title]

BONDED STEEL PLATE HAVING EXCELLENT SOUND-ABSORBING, VIRBRATION-DAMPING AND PROCESSABILITY [Technical Field]

<i> The present invention relates to a bonded steel plate, which has excellent sound-absorbing, vibration-damping and processabi lity characteristics, and in particular to a bonded steel plate in which a surface plate and a support plate supporting the surface plate are bonded with an adhesive resin having an excellent sound absorption performance with the helps of its viscosity and a vibration damping performance for thereby obtaining an excellent vibration damping performance and a sound absorption performance, so it is possible to significantly decrease a manufacturing unit cost, and it is possible to manufacture a product with all kinds of conventional forming and processing methods along with its excellent forming performance. [Background Art]

<2> In general, steel sheets themselves have very poor sound-isolating, sound-absorbing, vibration-damping and heat-insulating characteristics, and have limitations of wide application to products, particularly, exposed to noise, vibration, change in temperature, and so on. For this reason, conventionally, the steel sheets make up for such characteristics by interposing a sound absorbing material and a material having excellent vibration-damping characteristics (e.g. vibration damping sheet, paint, tape and the like) between two of them.

<3> However, in the case of using the sound absorbing material or vibration-damping material, etc. in this way, there is a trouble that the sound absorbing material or vibration-damping material, etc. should be separately installed when constructed, and particularly, in terms of the workability, the sound absorbing material or vibration-damping material, etc. should be separately worked so as to be compatible with the shape of each steel sheet apart from steel sheet working.

<4> In particular, when a product is manufactured using a single steel plate(for example, stainless or something), a steel plate might crack but does not broken due to its higher hardness, whereas when it collides with a metallic material, a sharp and weird sound is generated. In addition, when it impacted, a certain vibration occurs depending on the kinds of steel plates. In case of a single steel plate, there is a certain limit that a noise from an external side cannot be effectively prevented since a sound absorption performance is poor due to its metallic property. So, it is needed to further add a sound absorption material in the interior when it is actually used.

<5> So, the inventor of the present invention has developed a bonded steel plate which has a low price and an excellent decoration performance. It is manufactured in such a manner that hetero- or homo-property metallic materials are bonded using an adhering resin having an excellent sound absorption performance and an excellent vibration damping performance, and an excellent forming performance can be obtained based on an adhering resin having a certain viscosity, so it is possible to apply the present invention to various products having a specific forming process. [Disclosure] [Technical Problem]

<6> Accordingly, it is an object of the present invention to provide a bonded steel plate which is manufactured by bonding a surface plate and a support plate using an adhesive resin, and it has a sound absorption function with the helps of an adhesive resin layer of a bonded steel plate, and a manufacturing unit cost can be significantly decreased, and a specific decoration performance similar with an expensive decoration material can be obtained, and a noise prevention function and a vibration damping performance can be obtained.

<7> Another object of the present invention is to provide a bonded plate, which has an adhesive resin maintaining a predetermined viscosity, thereby preventing an adhesive resin layer itself from being fractured, and increasing sound-absorbing and vibration-damping characteristics due to such viscosity.

<8> Meanwhile, in order to solve a problem that the cost of production is sharply increased in the case of using a conventional single steel sheet made of relatively expensive stainless steel, copper, aluminum etc., an object of the present invention is to provide a bonded plate, in which a surface plate exposed to the outside is formed thin using a steel sheet having excellent appearance and workability, and simultaneously a backing plate backing the surface plate inside is formed of a relatively inexpensive steel sheet and is bonded with the surface plate using an adhesive resin having excellent sound- absorbing and vibration-damping characteristics, thereby remarkably reducing the cost of production. [Technical Solution]

<9> According an aspect of the present invention, there is provided a bonded plate, having excellent sound-absorbing and vibration-damping characteristics. The bonded plate includes^ a surface plate; a backing plate backing the surface plate; and an adhesive resin interposed between the surface plate and the backing plate and bonding the surface plate and the backing plate with each other, wherein the adhesive resin has a thickness from about 0.02 mm to about 0.1m.

<io> Preferably, the adhesive resin may have viscosity from 2500 cps to 4500 cps.

<π> Also, the surface plate and the backing plate may each have bending rigidity from about 10.5 Nm to about 16.5 Nm.

<i2> Here, the surface plate may have a thickness from 0.1 mm to 0.5 mm, and the backing plate may have a thickness from about 0.5 mm to about 1.9 mm.

<13> Further, the surface plate may be formed from any one selected from stainless steel, copper and aluminum, which have excellent appearance and workability, and the backing plate may be formed from any one selected from a galvanized steel sheet, a stainless steel sheet, an aluminum sheet, a polyester painted steel sheet, a cold rolled steel sheet, and a pickled and oiled steel sheet.

<14> Meanwhile, the backing plate may further include an anti-corrosion coating layer on a lower surface thereof. [Advantageous Effects]

<15> According to the present invention, the present invention has the following effects.

<16> First, since a bonded steel plate is manufactured by bonding a surface plate and a support plate using an adhesive resin, and it has a sound absorption function with the helps of an adhesive resin layer of a bonded steel plate, and a manufacturing unit cost can be significantly decreased, and a specific decoration performance similar with an expensive decoration material can be obtained, and a noise prevention function and a vibration damping performance as well as a diabetic function can be obtained.

<17> Second, the bonded plate maintains the adhesive resin thereof to have a predetermined viscosity, so that, when the bonded plate is formed, the adhesive resin layer itself is not fractured, and can increase sound- absorbing, vibration-damping, and heat-insulating characteristics due to such viscosity.

<i8> Third, in order to solve the problem that the cost of production sharply increases in the case of using the conventional single steel sheet made of relatively expensive stainless steel, copper and aluminum etc., the bonded plate is produced in such a manner that the surface plate exposed to the outside is formed thin using the steel sheet having excellent appearance and workability, and simultaneously the backing plate backing the surface plate inside is formed from the relatively inexpensive steel sheet and is bonded with the surface plate using the adhesive resin having excellent sound-absorbing and vibration-damping, so that it can remarkably reduce the cost of production. [Description of Drawings]

<i9> The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:

<20> FIG. 1 is a partial perspective view illustrating the structure of a bonded plate according to an embodiment of the present invention;

<2i> FIG. 2 is a sectional view taken along the line A-A of FIG. l;

<22> FIG. 3 to FIG. 8 are frequency response graphs acquired from the samples of the bonded plate according to the present invention; and

<23> FIG. 9 is an image photographed using an electron microscope as a result of a retting test of a bonded steel plate. [Best Mode]

<24> Hereinafter, a bonded plate according to the present invention, will be described in greater detail with reference to the accompanying drawings.

<25> FIG. 1 is a partial perspective view illustrating the structure of a bonded plate according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A-A of FIG. 1.

<26> As illustrated in FIGS. 1 and 2, the bonded plate 10 according to the present invention includes a surface plate 11, a backing plate 12 backing the surface plate 11, and an adhesive resin 13 interposed between the surface plate 11 and the backing plate 12 to bond the surface and backing plates 11 and 12 with each other.

<27> The surface plate 11 and the backing plate 12 could be any kinds of metallic plate. Preferably, the surface plate 11 is made of stainless steel, which has excellent workability and corrosion resistance, and the backing plate 12 is selected from a galvanized steel sheet, a stainless steel sheet, an aluminum sheet, a polyester painted steel sheet, a cold rolled steel sheet, or a pickled and oiled steel sheet. More preferably, the surface plate employs any one of the SUS 300 series having excellent workability and corrosion resistance (and most preferably SUS 304). It is preferable that the surface plate is essential to have the corrosion resistance and the excellent appearance, because the surface plate is exposed to the outside.

<28> More preferably, the backing plate 12 is preferably selected from the steel sheets, which have excellent workability in order to secure the formability of the entire bonded plate so as to bend the bonded plate as well as enough strength to back the surface plate. Specifically, the backing plate can employ a galvanized steel sheet, a stainless steel sheet, an aluminum sheet, a polyester painted steel sheet, a cold rolled steel sheet, or a pickled and oiled steel sheet. Here, the galvanized steel sheet should be broadly interpreted to include a hot dip galvanized steel sheet, an electrolytic galvanized steel sheet, a galvannealed steel sheet, an aluminum coated steel sheet, a zinc-aluminum alloy coated steel sheet and so on.

<29> As described above, the surface plate and the backing plate should have excellent formability in order to form the bonded plate into products having various shapes. In order to meet this formability, the bonded plate is preferably selected from materials having bending rigidity from 10.5 Nm to 16.5 Nm.

<30> The bending rigidity is calculated using a Ross Kerwin Ungar (RKU) method expressed by Equation 1 below:

<3i> Equation 1

<33> where Bc is the bending rigidity, u is the Poisson' s ratio, and tc is the total thickness.

<34> Particularly, when the bending rigidity is less than 10.5 Nm, the bonded plate is warped by weak force, and thus can be vulnerable to external impact after formation. In contrast, when the bending rigidity is more than 16.5 Nm, the bonded plate is lowered in the formability, and thus cannot be smoothly formed into the products such as a sink bowl, a fire door and a water tank, etc.

<35> The adhesive resin 13 is interposed between the surface plate 11 and the backing plate 12, and functions to bond the surface and backing plate 11 and 12 with each other. Preferably, the adhesive resin 13 is formed at a thickness from 0.02 mm to 0.1 mm. Because the adhesive resin 13 is interposed between the surface and backing plates 11 and 12 to serve as a shock-absorbing, sound-absorbing and heat-insulating material, it enables the entire bonded plate 10 to produce excellent sound-absorbing, heat-insulating, and vibration-damping effects. In other words, a layer of the adhesive resin functions to bond the surface plate and the backing plate, and simultaneously damp the vibration and noise applied from the outside.

<36> Preferably, the adhesive resin used in the present invention has viscosity from 2500 cps to 4500 cps. When the viscosity is less than 2500cps, the viscosity is too low, so a bonded surface plate might not be reliably bonded to a support plate, but be laminated. In particular, a surface plate might be gapped with a bonded support plate during a forming process such as a bending process or something, which causes a certain step.

<37> In contrast, when the viscosity is more than 4500 cps, the viscosity of the adhesive resin is too high, so that, in the case of forming and working the bonded plate, part of the cured adhesive resin layer is fractured, or the surface plate of the bonded plate is warped. Thus, the adhesive resin used for the bonded plate of the present invention should maintain the viscosity of a predetermined level in order to guarantee excellent formability. Further, due to such viscosity, the adhesive resin can further increase vibration-damping, sound-absorbing, heat-insulating effects.

<38> The table 1 shows the values corresponding to a forming performance, a lamination and a soundproof of a bonded steel plate depending on a viscosity of an adhering resin.

<39> [Table 1]

<40> ^ In the forming performing, X represents a state when a step is formed as an adhering region is leaked through an end surface of a bonded steel plate during a forming process such as a bending, a press process and a drawing or as the bonded steel plates are spaced apart from each other or when a desired bonding force is not obtained since a bonded region is broken, and Δ represents a state that part of the above is found, and O represents a state that nothing is found.

<41> & In the lamination, X represents a state that no lamination is found, and Δ represents a state that part of the lamination is found, and 0 represents that noting is found.

<42> & Assuming that the noise level of a single steel plate is 1, a soundproof level is shown by comparing a soundproof performance by means of a bonded steel plate.

<43> As seen in the table 1, when the viscosity of the adhesive resin is 2500~4500cps, the forming performance is excellent, and no lamination is found, and a soundproof performance is excellent as compared to a single steel plate.

<44> Preferably, the surface plate is formed to have a thickness from 0.1 mm to 0.4 ram, the backing plate is formed to have a thickness from 0.4 mm to 1.2 mm, and the adhesive resin bonding the surface plate with the backing plate is formed to have a thickness from 0.02 mm to 0.1 mm. In order to solve the problem that the cost of production sharply increases in the case of using the conventional single steel sheet made of relatively expensive stainless steel, etc., the present invention is technically characterized in that the surface plate, which requires excellent corrosion resistance and workability due to the exposure to the outside, is formed thin, and simultaneously the backing plate backing the surface plate inside is thickly formed of the relatively inexpensive steel sheet, and is bonded with the surface plate using the adhesive resin having excellent sound and vibration damping characteristics. Preferably, the surface plate is formed to have a thickness from 0.1 mm to 0.4 mm. When the surface plate has a thickness of 0.1 mm or less, it is too thin, and thus itself is warped or torn by impact applied from the outside. In contrast, when the surface plate has a thickness of 0.4 mm or more, the effect of reducing the cost of production is relatively lowered. Meanwhile, the adhesive resin is formed to have a thickness from 0.02 mm to 0.1 mm. When the adhesive resin has a thickness of 0.02 mm or less, the sound-absorbing, vibration-damping, and heat-insulating characteristics are lowered. In contrast, when the adhesive resin has a thickness of 0.1 mm or more, the adhesive resin layer cannot maintain uniform viscosity in the thickness direction.

<45> More preferably, the backing plate may be provided with an anti- corrosion coating layer on a lower surface thereof. This is because the backing plate uses the relatively inexpensive ordinary steel sheet unlike the surface plate, and thus has a possibility of generating internal corrosion when used for a long time. [Mode for Invention]

<46> 1. Test for vibration damping performance <47> The inventor of the present invention has calculated a frequency response function curve of Figures 3 through 8 by vibrating a sample with an impact vibration hammer in a state that a bonded steel plate sample is hanged so as to test a vibration decrease characteristic of a bonded steel plate, and has calculated a loss coefficient based on a half amplitude method at a first, second or third inherent vibration number and an inherent vibration number from the frequency response function curve, respectively.

<48> So as to decrease a measurement error during a test, the values are calculated through three tests with respect to each sample. The samples used are a single STS steel plate(Figure 3), a STS bonded steel plate(Figure 4), a single Cu steel plate(Figure 5), a Cu bonded steel plate(Figure 6), a single Al steel plate(Figure 7), and an Al bonded steel plate(Figure 8), with the thickness of each sample being 0.8mm.

<49> The present invention covers a bonded steel plate bonded with hetero- property steel plates, but for a clear characteristic comparison of a vibration decrease of a bonded steel plate, a test sample is made by bonding homo-property steel plates.

<50> [Table 2]

Vibration damping test analysis

Qjmβwten/ββmr

Low frequency Middle frequency High frequency

Inherent frequency] Loss coefficient Inherent frequency Loss coefficient Inherent frequency Loss coefficient

62.75 0.78 172.5 0.198 340.4 0.233

STS 64.13 0.829 175.5 0.198 347 0.187 63.75 ' 0.801 175.5 0.178 346.6 0.192

68.63. 1 .03 187.8 0.513 370 0.569

STS 68.88, 0.807 189 0.469 372.5 0.505 bonding

68.7S ₁ 0.745 189.3 0.443 372 9 0.436

44.25 3.44 118.8 0.32 234 4 0.424

Cu 44.75 3.01 119.9 0.331 237.3 0.59 45.5 2.913 121 .1 0.331 239 0.593

57 1 .41 153.8 1 .74 300.5 2.87

Cu 56.88 1.91 152.9 2.11 298.8 3.13 bonding

57 ' 1 .79 152.9 2.02 299.6 3.04

63.88 ' 3.3 174.3 0.784 346 0.395

Al 64.63 4.33 176.1 0.851 349.6 0.404 64.38 3.23 176 0.879 349.5 0.383

60.88 1 .92 163.5 2.34 319.6 3.51

Al 60.63 2.27 162.5 2.5 318.5 3.78 bonding

60 2.14 164 2.45 321 .1 3.51

<51> As seen in the table 2, the bonded steel plate according to the present invention shows an excellent vibration damping performance particularly in middle and high frequency regions as compared to a single material steel plate.

<52> 2. Test for anti-chemical performance <53> The inventor of the present invention has observed a lamination of a test sample with an electron microscope in such a manner that a STS bonded steel plate of the present invention is retted in acetic acid of 10%, sodium hydroxide of 40%, sodium carbonate of 20% which are maintained at 25V.S. for 48 hours.

<54> Figure 9 is an image taken using an electron microscope based on the above test, and Figure 9A is an image when the sample is retted in acetic acid of 10%, Figure 9B is an image when the sample is retted in sodium hydroxide of 40%, and Figure 9C is an image when the sample is retted in sodium carbonate of 20%. As seen in Figure 9, no lamination and no corrosion is found even after retting process.

<55> Although the exemplary embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as defined in the accompanying claims.

Claims

[CLAIMS] [Claim 1]

A bonded plate, having excellent sound-absorbing, vibration-damping and processability, comprising: a surface plate; a backing plate backing the surface plate; and an adhesive resin interposed between the surface plate and the backing plate and bonding the surface plate and the backing plate with each other, wherein the adhesive resin has a thickness from about 0.02 mm to about 0.1 mm and has viscosity from about 2500 cps to about 4500 cps. [Claim 2]

The bonded plate as set forth in claim 1, wherein each of the surface plate and the backing plate has bending rigidity from 10.5 Nm to 16.5 Nm. [Claim 3]

The bonded plate as set forth in claim 1, wherein the surface plate has a thickness from 0.1 mm to 0.5 mm, and the backing plate has a thickness from 0.5 mm to 1.9 mm. [Claim 4]

The bonded plate as set forth in claim 1, wherein the surface plate is formed from one selected from stainless steel, copper, aluminum, which have excellent corrosion resistance and workability, and wherein the backing plate is formed from one selected from the group consisting of a galvanized steel sheet, a stainless steel sheet, an aluminum sheet, a polyester painted steel sheet, a cold rolled steel sheet, and a pickled and oiled steel sheet. [Claim 5]

The bonded plate as set forth in claim 1, wherein the backing plate further includes an anti-corrosion coating layer on a lower surface thereof.