WO2022149409A1 - Composite member and device - Google Patents

Abstract

[Problem] To reliably suppress change of form during the production and usage, while achieving temperature uniformity and cost saving. [Solution] A composite member according to the present invention is provided with an aluminum sheet, a steel sheet and a resin layer that is interposed between the aluminum sheet and the steel sheet; the thickness t_A of the aluminum sheet is from 0.20 mm to 1.60 mm; the thickness t_B of the steel sheet is from 0.15 mm to 1.20 mm; the total thickness t_T of the composite member is from 1.50 mm to 5.00 mm; and the thickness t_A of the aluminum sheet is not less than the thickness t_B of the steel sheet.

Description

Composite members and equipment

The present invention relates to composite members and devices.

In recent years, the market share of organic EL displays has been increasing. The organic EL display is a display utilizing the fact that a light emitting material contained in an organic EL element emits light when it returns to the ground state after being excited by receiving energy. When the temperature of the organic EL element changes, the band gap of the light emitting material changes, so that the emission color changes. In order to prevent such a change in emission color, it is important to have heat equalization in the plane of the organic EL display panel, which is an aggregate of organic EL elements. In order to realize such heat soaking property, aluminum is often attached to an organic EL display panel in an organic EL display (see, for example, Patent Document 1 below). However, since the rigidity is insufficient only with aluminum, in recent years, laminated members having a material composition of aluminum / resin / aluminum have come to be attached to an organic EL display panel.

Since the organic EL display panel is attached to one surface of such a laminated member, the flatness of the surface is required to be good. In addition, from the viewpoint of life cycle assessment, weight reduction is also required for the purpose of reducing carbon dioxide generated during transportation. As this index, specific rigidity (rigidity per unit mass) is obtained. Further, in recent years, as the market competition for organic EL displays intensifies, there is a tendency that cost reduction is required for the members constituting the organic EL displays.

Here, since aluminum is an expensive metal, in order to reduce the cost of members, it is sufficient to consider reducing the amount of aluminum used while ensuring rigidity. For that purpose, it is conceivable to realize a laminated member composed of aluminum / resin / iron by using iron, which is a metal having rigidity but cheaper than aluminum, instead of a part of aluminum. Eh. As a laminated member made of such a material, for example, Patent Document 2 below discloses a laminated member having a structure of metal material / resin / metal material, and as an example of the metal material, aluminum, steel, and plating. Steel plates and the like are exemplified. Further, for example, Patent Document 3 below discloses a laminated steel sheet for a reflector having a structure of aluminum foil / resin / steel sheet.

Japanese Unexamined Patent Publication No. 9-314734 US Pat. No. 4,313996 Japanese Unexamined Patent Publication No. 58-31745

Here, in the above-mentioned Patent Document 2, various metal materials are exemplified, and as a combination thereof, a configuration of aluminum / resin / iron can be considered. However, only the combinations of the same type of metal materials are specifically studied in the same document, and the combinations of different types of metal materials are merely exemplified.

Further, since the laminated steel sheet disclosed in Patent Document 3 is for a reflector, aluminum foil is used so that the optical characteristics are appropriate. However, the laminated member as described above is not only exposed to the heat radiated from a device that generates heat with operation such as an organic EL display panel, but is also required to have heat equalization property. In this case, since the laminated member is required to have a predetermined amount or more of heat conduction, it is difficult to achieve the desired heat conduction with the aluminum foil as used in Patent Document 3 because the thickness is small. Become. From this point of view, the present inventors have found that it is important to increase the thickness of aluminum used for the laminated member to some extent.

On the other hand, aluminum and iron (steel plate) constituting the laminated member have different linear expansion coefficients, and the linear expansion coefficient of aluminum (23.0 × ^10-6 / ° C) is the iron wire. It is larger than the coefficient of expansion (12.1 × 10 ^-6 / ° C) (that is, aluminum is more likely to expand). In the case of the aluminum foil as in Patent Document 1, since the thickness of aluminum is extremely thinner than the thickness of the steel sheet, it is not necessary to consider the difference in the coefficient of linear expansion as described above. However, as the present inventors have found, by increasing the thickness of aluminum, the above-mentioned difference in linear expansion coefficient has a significant effect. When these materials are exposed to heat during the manufacture or use of the laminated member, a shape change (more specifically, warpage) due to a difference in the coefficient of linear expansion occurs. More specifically, at the time of manufacture, the shape change occurs due to the heat of the resin in the molten state, and at the time of use, the shape change occurs due to heat transfer from the device that generates heat during operation.

As described above, there is a trade-off relationship between the soaking property of a member and the suppression of shape changes during manufacturing and use. Therefore, the present inventors can more reliably suppress the shape change during manufacturing and use while realizing heat soaking property and low cost as a member, and can further improve the flatness as a member. It was newly discovered that various technologies are required.

Further, when fixing a member to a device that generates heat during operation, a fixing means such as a screw is often used, but the head of the fixing means such as a screw is not projected from the surface of the member. Generally, processing such as deep drawing is performed. Therefore, it is considered that the member is required to have workability in addition to the above-mentioned characteristics.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to realize shape change during manufacturing and use while realizing processability, heat soaking property and low cost. It is an object of the present invention to provide a composite member and an apparatus capable of reliably suppressing the flatness as a member and further improving the flatness as a member.

As a result of diligent studies by the present inventors in order to solve the above-mentioned problems, the thickness of the aluminum plate and the steel plate satisfies a specific condition, so that the heat equalizing property and the shape which have a trade-off relationship as described above are obtained. We came up with the idea that it would be possible to achieve both suppression of changes and completed the present invention.
The gist of the present invention completed based on such findings is as follows.

(1) A composite member including an aluminum plate, a steel plate, and a resin layer interposed between the aluminum plate and the steel plate, and the thickness t _A of the aluminum plate is 0.20 to 1.60 mm. The thickness t _B of the steel sheet is 0.15 to 1.20 mm, the total thickness t _T of the composite member is 1.50 to 5.00 mm, and the thickness t _A of the aluminum plate is 1. A composite member having a thickness t _B or more of the steel plate.
(2) The composite member according to (1) or (2), wherein the flatness of the composite member is such that the maximum strain in an arbitrary direction is 3.0 mm or less.
(3) The composite member according to (1) or (2), wherein the flatness of the composite member is such that the maximum strain in an arbitrary direction is 2.0 mm or less.
(4) The ratio t _A / t _B of the thickness t _A of the aluminum plate to the thickness t _B of the steel plate is 1.10 to 3.30, according to any one of (1) to (3). Composite member.
(5) The thickness t _A of the aluminum plate, the thickness t _B of the steel plate, and the total thickness t _T of the composite member satisfy the relationship of (t _A + t _B ) / t _T ≤ 0.65. The composite member according to any one of (1) to (4).
(6) The composite member according to any one of (1) to (5), wherein the resin layer contains a polyethylene resin or an epoxy resin.
(7) The composite member according to any one of (1) to (6), wherein the glass transition point Tg of the resin contained in the resin layer is 0 ° C. or lower, or 50 to 180 ° C.
(8) The ratio E'/ E "of the dynamic storage elastic modulus E'and the dynamic loss elastic modulus E" at 100 ° C. of the resin contained in the resin layer is 0.20 to 20.0. The composite member according to any one of (1) to (7).
(9) Any one of (1) to (8) further comprising an adhesive layer between the resin layer and the aluminum plate, or at least between the resin layer and the steel plate. The composite member described in.
(10) The steel sheet has a plating layer located on at least one surface and a coating film layer located on the plating layer, according to any one of (1) to (9). The composite member described.
(11) The composite member according to any one of (1) to (10) and the surface of the composite member on the aluminum plate side are located in a state where at least a part of the composite member is in contact with each other, and heat is generated during operation. A device and a device that has.
(12) The device according to (11), wherein the device that generates heat during the operation is an organic EL display panel, and the device is an organic EL display.

As described above, according to the present invention, while realizing workability, heat soaking property, and low cost, shape changes during manufacturing and use are more reliably suppressed, and flatness as a member is further improved. It becomes possible.

It is explanatory drawing which shows typically an example of the composite member which concerns on embodiment of this invention. It is explanatory drawing which shows the example of the composite member which concerns on the same embodiment schematically. It is explanatory drawing which shows the example of the composite member which concerns on the same embodiment schematically. It is explanatory drawing which shows the example of the composite member which concerns on the same embodiment schematically. It is explanatory drawing which shows typically an example of the steel plate in the composite member which concerns on the same embodiment. It is explanatory drawing which shows typically an example of the steel plate in the composite member which concerns on the same embodiment. It is a flow chart which showed an example of the flow of the manufacturing method of the composite member which concerns on the same embodiment. It is explanatory drawing which shows typically the structure of the apparatus which used the composite member which concerns on the same embodiment. It is a schematic diagram for demonstrating the measuring method of a shape change at the time of use.

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings below. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, and duplicate description will be omitted.

(About composite members)
<About the overall configuration of the composite member>
First, the overall configuration of the composite member according to the embodiment of the present invention will be described with reference to FIGS. 1A to 1D. 1A to 1D are explanatory views schematically showing an example of a composite member according to the present embodiment. In addition, in FIGS. 1A to 1D, each figure is appropriately enlarged or reduced for the sake of facilitation of explanation, and the figure does not show the actual size and ratio of each part.

As shown in FIG. 1A, the composite member 1 according to the present embodiment has an aluminum plate 10, a steel plate 20, and a resin layer 30 interposed between the aluminum plate 10 and the steel plate 20. Therefore, the composite member 1 can be said to be an aluminum-resin-steel (or iron) laminated plate (or composite plate).

The aluminum plate 10 is not particularly limited except for the conditions related to the thickness described below, and various aluminum plates can be used. Here, the aluminum plate may be made of pure Al or may be made of various aluminum alloys. Further, the shape of the aluminum plate 10 is not particularly limited, and can be appropriately set according to the object in which the composite member 1 is used.

The conditions regarding the thickness of the aluminum plate 10 will be described again below.

The steel plate 20 is not particularly limited except for the conditions related to the thickness described below, and various steel plates can be used depending on the mechanical strength and the like required for the steel plate 20. Examples of such a steel plate 20 include ultra-low carbon steel containing Al killed steel, Ti, Nb and the like, and high-strength steel in which the ultra-low carbon steel further contains a reinforcing element such as P, Si and Mn. Various steel plates such as these can be mentioned. Further, as the steel plate 20, various alloy steel plates such as stainless steel plates can be used. Further, the shape of the steel plate 20 is not particularly limited, and can be appropriately set according to the object in which the composite member 1 is used.

Various conditions such as the thickness of the steel plate 20 will be explained again below.

The resin layer 30 is a layer located between the aluminum plate 10 and the steel plate 20. As described above, the aluminum plate 10 and the steel plate 20 have greatly different linear expansion coefficients, and due to the difference in the linear expansion coefficients, the shape changes due to heat during the manufacture and use of the composite member 1. Can occur. However, as described in detail below, the aluminum plate 10 and the steel plate 20 have a specific thickness, and the resin layer 30 exists between the aluminum plate 10 and the steel plate 20 in an appropriate thickness. It is possible to alleviate the difference in the coefficient of linear expansion between the plate 10 and the steel plate 20 and suppress the occurrence of shape change.

The conditions required for the resin layer 30 will be described in detail below.

Further, as shown in FIGS. 1B to 1D, the composite member 1 according to the present embodiment is located at least between the resin layer 30 and the aluminum plate 10 or between the resin layer 30 and the steel plate 20. , The adhesive layer 40 may be further provided. By further providing the adhesive layer 40, the adhesiveness between the resin layer 30 and the aluminum plate 10 and between the resin layer 30 and the steel plate 20 can be further improved.

The adhesive layer 40 will be described again below.

<Thickness of each layer of composite member 1>
Subsequently, the thickness of each layer constituting the composite member 1 will be described in detail. In the following description, as shown in FIGS. 1A to 1D, the thickness of the aluminum plate 10 is represented by t _A , the thickness of the steel plate 20 is represented by t _B , and the total thickness of the composite member 1 is represented by t _T. And.

In the composite member 1 according to the present embodiment, the thickness t _A of the aluminum plate 10 is 0.20 to 1.60 mm, the thickness t _B of the steel plate 20 is 0.15 to 1.20 mm, and the composite member 1 The total thickness t _T of the aluminum plate 10 is 1.50 to 5.00 mm, and the thickness t _A of the aluminum plate 10 is equal to or larger than the thickness t _B of the steel plate 20. By satisfying these four conditions, the composite member 1 according to the present embodiment realizes heat equalization and low cost, and more reliably suppresses shape changes during manufacturing and use, and is composited. It becomes possible to further improve the flatness as a member.
Hereinafter, the above conditions will be described in more detail.

[T _A : 0.20 to 1.60 mm]
In the composite member 1 according to the present embodiment, the thickness _tA of the aluminum plate 10 is 0.20 to 1.60 mm. When the thickness t _A of the aluminum plate 10 is less than 0.20 mm, the heat conduction required for the composite member 1 as a whole is insufficient, and the heat equalization property of the composite member 1 as a whole cannot be realized. By setting the thickness _tA of the aluminum plate 10 to 0.20 mm or more, it is possible to realize the heat equalization required for the composite member 1. The thickness t _A of the aluminum plate 10 is preferably 0.30 mm or more, more preferably 0.40 mm or more, and further preferably 0.50 mm or more. On the other hand, when the thickness _tA of the aluminum plate 10 according to the present embodiment is more than 1.60 mm, a large amount of aluminum, which is an expensive metal, is used, and low cost cannot be realized. By setting the thickness _tA of the aluminum plate 10 to 1.60 mm or less, it is possible to achieve the desired soaking property while maintaining low cost. The thickness t _A of the aluminum plate 10 is preferably 1.20 mm or less, more preferably 1.00 mm or less.

[T _B : 0.15 to 1.20 mm]
In the composite member 1 according to the present embodiment, the thickness t _B of the steel plate 20 is 0.15 to 1.20 mm. When the thickness t _B of the steel plate 20 is less than 0.15 mm, the rigidity required for the composite member 1 as a whole cannot be realized. By setting the thickness t _B of the steel plate 20 to 0.15 mm or more, it is possible to realize the rigidity required for the composite member 1 as a whole. The thickness t _B of the steel sheet 20 is preferably 0.20 mm or more, more preferably 0.30 mm or more, and further preferably 0.40 mm or more. On the other hand, when the thickness t _B of the steel plate 20 exceeds 1.20 mm, the thickness of the aluminum plate must be increased as described later. As a result, the strength of the composite member is increased and the press workability is lowered. By setting the thickness t _B of the steel sheet 20 to 1.20 mm or less, heat soaking property, rigidity, and press workability can be arranged side by side. The thickness t _B of the steel sheet 20 is preferably 1.00 mm or less, more preferably 0.80 mm or less, and further preferably 0.60 mm or less. When various steel sheets having a plating layer or a coating film layer on the surface of the base steel sheet as described below are used as the steel sheet 20, the total thickness including the plating layer and the coating film layer is determined. The thickness t _B of the steel plate 20 is used.

[T _A ≧ t _B ]
In the composite member 1 according to the present embodiment, the thickness t _A of the aluminum plate 10 and the thickness t _B of the steel plate 20 are within the above ranges, and the thickness t _A of the aluminum plate 10 is the steel plate 20. Thickness t _B or more. When the thickness _tA of the aluminum plate 10 is increased, the warp caused by the difference in linear expansion coefficient between the aluminum plate 10 and the steel plate 20 becomes large. On the other hand, by increasing the thickness _tA of the aluminum plate 10, the rigidity of the composite member 1 is increased. As a result, the warp caused by the difference in the coefficient of linear expansion becomes small. When the thickness t _A of the aluminum plate 10 is less than the thickness t _B of the steel plate 20, the influence of the steel plate 20 having a large coefficient of linear expansion acts strongly, and even if the resin layer 30 is provided, it is used during manufacturing. It is not possible to suppress the shape change that sometimes occurs due to heat. When the thickness t _A of the aluminum plate 10 is equal to or greater than the thickness t _B of the steel plate 20, the difference in the coefficient of linear expansion between aluminum and iron can be alleviated by the resin layer 30, which is caused by heat during manufacturing and use. It is possible to reliably suppress the shape change that occurs and further improve the flatness of the composite member. It is more preferable that the thickness t _A of the aluminum plate 10 is thicker than the thickness t _B of the steel plate 20 (that is, t _A > t _B ).

[ _TT : 1.50 to 5.00 mm]
In the composite member 1 according to the present embodiment, the total thickness t _T of the composite member 1 is 1.50 to 5.00 mm. When the total thickness t _T of the composite member 1 is less than 1.50 mm, it is not possible to further improve the flatness of the composite member while achieving both heat soaking property and suppression of shape change. By setting the total thickness t _T of the composite member 1 to 1.50 mm or more, it is possible to further improve the flatness of the composite member while achieving both heat soaking property and suppression of shape change. The total thickness t _T of the composite material 1 is preferably 2.00 mm or more, more preferably 2.50 mm or more, and further preferably 3.00 mm or more. On the other hand, when the total thickness t _T of the composite member 1 exceeds 5.00 mm, the workability required for the composite member 1 cannot be obtained. The composite member 1 is used by joining to other parts by a mechanical fixing means such as a screw. At that time, it is often used by shallow drawing so that the head of a screw or the like does not come out from the surface of the composite member 1. When the total thickness t _T exceeds 5.00 mm, the above-mentioned shallow drawing process becomes difficult. By setting the total thickness t _T of the composite member 1 to 5.00 mm or less, it is possible to achieve both thermal properties and workability. The total thickness t _T of the composite material 1 is preferably 4.50 mm or less, more preferably 4.00 mm or less.

The thickness of the resin layer 30 and the thickness of the adhesive layer 40 are obtained by subtracting the thickness t _A of the aluminum plate 10 and the thickness t _B of the steel plate 20 from the total thickness t _T of the composite member 1 according to the present embodiment. Is the total of.

[Ratio t _A / t _B : 1.10 to 3.30]
In the composite member 1 according to the present embodiment, the ratio t _A / t _B of the thickness t _A of the aluminum plate 10 to the thickness t _B of the steel plate 20 is preferably 1.10 to 3.30. By setting the ratio t _A / t _B to 1.10 to 3.30, it is possible to further improve the flatness as a composite member while achieving both heat soaking property and suppression of shape change. It will be possible. The lower limit of the ratio t _A / t _B is more preferably 1.20, still more preferably 1.30, and even more preferably 1.40. The upper limit of the ratio t _A / t _B is more preferably 3.00, further preferably 2.50, even more preferably 2.00, and particularly preferably 1.70.

[(T _A + t _B ) / t _T ≤ 0.65]
In the composite member 1 according to the present embodiment, the thickness t _A of the aluminum plate 10, the thickness t _B of the steel plate 20, and the total thickness t _T of the composite member 1 are (t _A + t _B ) / t _T ≤ 0. It is preferable to satisfy the relationship of 65. By satisfying the relationship of (t _A + t _B ) / t _T ≤ 0.65, the flatness as a composite member is further improved while achieving both heat equalization and suppression of shape change more reliably. It becomes possible. The value of (t _A + t _B ) / t _T is more preferably 0.60 or less, still more preferably 0.50 or less, even more preferably 0.40 or less, and particularly preferably 0.35. It is as follows. It is not necessary to set a lower limit of the value of (t _A + t _B ) / t _T , but it may be 0.10, 0.15, 0.20 or 0.28.

[Thickness measurement method]
Here, the thickness of each layer constituting the composite member 1 (for example, the thickness t _A of the aluminum plate 10, the thickness t _B of the steel plate 20, the overall thickness t _T , the thickness of the resin layer 30, etc.) can be determined by various known methods. It is possible to measure with.

For example, when the thickness of the aluminum plate 10 is measured ex post facto, the composite member 1 is embedded in a thermosetting resin such as an epoxy resin, and a cutting machine such as a precision cutter is used to parallel the thickness direction at a portion to be observed. The sample is cut so as to obtain a cross section, and the obtained cross section is observed with an optical microscope. Measure the shortest distance from any position (for example, 5 places) on the interface between the embedded resin and the aluminum plate 10 to the interface between the aluminum plate 10 and the resin layer 30 (that is, in the direction perpendicular to the interface). Measure the distance to) and average the obtained measurements. The average thickness of the aluminum plate 10 thus obtained can be defined as the thickness t _A of the aluminum plate 10.

Further, the thickness of the other layer of the composite member 1 according to the present embodiment can also be measured in the same manner as described above.

<About the layer structure of the steel plate 20>
2A and 2B are explanatory views schematically showing an example of the configuration of the steel plate 20 according to the present embodiment.
As described above, various steel sheets and alloy steel sheets can be used as the steel sheet 20 according to the present embodiment, but as the steel sheet 20, various plating treatments are applied to the various steel sheets as described above. It is also possible to use a surface-treated steel sheet that has been subjected to various surface treatments.

Here, the surface treatment includes, for example, various plating treatments such as zinc plating (hot galvanized steel plate, electrozinc plating, etc.) and aluminum plating, chemical conversion treatments such as chromate treatment and non-chromate treatment, and physics such as sandblasting. Examples include, but are not limited to, chemical surface roughening treatments such as target or chemical etching (which can also be regarded as a design processing treatment that adds design properties). Further, the plating may be alloyed or a plurality of types of surface treatments may be applied. As the surface treatment, it is preferable that at least a treatment for the purpose of imparting rust prevention is performed.

For example, the steel plate 20 according to the present embodiment has a plating layer 203 located on one surface or both surfaces of the base steel plate 201 and a plating layer, as schematically shown in FIGS. 2A and 2B. It may have a coating film layer 205 located on the surface of 203.

Here, the plating layer 203 is representative of hot-dip zinc plating, zinc alloy plating, alloyed hot-dip zinc plating, electric zinc plating, electric Zn-Ni plating, hot-dip Zn-5% Al alloy plating and hot-dip 55% Al-Zn alloy plating. Hot-dip Zn-Al represented by hot-dip Zn-Al alloy plating, hot-dip Zn-1 to 12% Al-1 to 4% Mg alloy plating, and hot-dip 55% Al-Zn-0.1 to 3% Mg alloy plating. -Various types of plating such as Mg alloy plating, Ni plating, alloyed Ni plating, Al plating, tin plating, and chrome plating can be mentioned.

Of the above platings, zinc-based plating containing Zn is particularly preferable as the plating layer 203 because it has excellent corrosion resistance.

Further, the coating film layer 205 is a layer composed of, for example, various base paints, various additives, and the like. Although the coating film layer 205 is shown as a single-layer structure in FIGS. 2A and 2B, the coating film layer 205 may have a multi-layer structure composed of a plurality of layers.

The base paint that can be contained in the coating film layer 205 is not particularly limited, and paints containing various known resins can be used. Examples of such resins include polyacrylic resins, polyolefin resins, polyurethane resins, epoxy resins, polyester resins, polybutyral resins, melamine resins, silicon resins, fluororesins, acrylic resins and the like. These resins can be used as they are or in combination. Further, these resins can be cured with any curing agent. Such paints can be used in any form such as organic solvent-based, water-based, and powder-based.

Further, as various additives that can be contained in the coating film layer 205 according to the present embodiment, for example, various extender pigments, colorants, chemical treatment agents, rust preventives, surface-modified metal powders and glass powders, and dispersions are used. Examples thereof include various additives such as agents, leveling agents, antioxidants, defoaming agents, viscosity modifiers, ultraviolet absorbers, waxes, aggregates, additives such as fluororesin beads, and diluting solvents. Since the fluororesin beads are spherical substances made of fluororesin and have lubricity by using fluororesin as a material, it is possible to improve the scratch resistance of the coating film. .. Here, when the coating film layer 205 contains various extender pigments and colorants as additives, the design of the steel sheet 20 can be improved and the steel sheet 20 can function as a designable steel sheet. As a result, when the composite member 1 according to the present embodiment is used as an exterior material, it can be used as a material showing excellent designability without applying a separate coating.

The components that can be contained in the coating film layer 205 according to the present embodiment have been described above by citing the coating composition. Usually, when these coating compositions are applied on the plating layer 203, these components and the component composition of the formed film are usually different. In the coating film layer 205, the composition of the coating film composition and the coating film layer 205 after coating are different due to the reaction with the plating layer 203, the volatilization of volatile components in the coating composition, and the like, and the coating film layer 205 is formed. It is usually technically difficult to specify the composition of the coating film layer 205. Further, it is technically difficult to specify the composition of such a coating film layer 205 by instrumental analysis or the like. Therefore, in the present embodiment, the coating film layer 205 to be formed is specified by specifying the components that can be contained in the coating composition.

Further, in the steel plate 20 according to the present embodiment, the surface of the plating layer 203 has a pattern, and the coating film layer 205 has a transparency in which the pattern can be visually recognized through the coating film layer 205. You may. Here, examples of the pattern on the surface of the plating layer 203 include gloss processing represented by buffing and mirror surface processing, and satin finish processing represented by hairline processing, vibration processing, blast processing, dull processing, and the like. be able to.

The steel plate 20 according to the present embodiment functions as a designable steel sheet by containing various additives as described above or having a pattern formed, so that the composite member 1 according to the present embodiment has an exterior. When used as a material, it can be used as a material showing excellent designability without applying a separate coating.

Here, the plating layer 203 as described above can be formed by various known plating methods such as a hot-dip plating method and an electroplating method. Further, the coating film layer 205 as described above is a generally known coating method (for example, roll coating, curtain flow coating, air spray, airless spray, dipping, bar coating, brush coating, etc.). It can be formed by applying with, drying and solidifying.

<About the resin layer 30>
The resin layer 30 according to the present embodiment is a layer provided to alleviate the difference in linear expansion coefficient between the aluminum plate 10 and the steel plate 20. Since the resin generally has a linear expansion coefficient of about several to several tens × ^10-5 / ° C., by interposing such a resin layer 30 between the aluminum plate 10 and the steel plate 20. It is possible to make the resin follow the shape change that may occur in the aluminum plate 10 and the steel plate 20, and to mitigate the shape change that may occur.

The resin layer 30 may contain at least one of a polyethylene resin (linear expansion coefficient: 10 to 20 × 10 ^-5 / ° C.) or an epoxy resin (linear expansion coefficient: 4 to 6 × 10 ^-5 / ° C.). preferable. When the resin layer 30 contains at least one of a polyethylene resin and an epoxy resin, it is possible to more reliably alleviate possible shape changes.

Further, the composite member 1 according to the present embodiment may be used for a device that generates heat during operation, but the resin layer 30 functions more reliably even in such a heat generation environment. The resin contained in is preferably one that does not have a glass transition point Tg in the temperature range to which the device is exposed. The temperature of the device fluctuates repeatedly from room temperature to the operating temperature. When the glass transition point Tg of the resin exists in this temperature range, the glass state and the rubber state are repeated every operation. Such a state change is accompanied by a volume change of the resin. Therefore, the volume of the composite member 1 repeatedly expands and contracts, which may impair the durability of the composite material 1.

For example, when considering application to home appliances such as display devices represented by organic EL displays, it is assumed that the product temperature fluctuates in the range of 0 ° C to 50 ° C. Therefore, the glass transition point Tg of the resin contained in the resin layer 30 is preferably 0 ° C. or lower, or 50 to 180 ° C., more preferably −20 ° C. or lower, or 50 to 140 ° C. .. In particular, the glass transition point Tg of the resin is most preferably 50 to 120 ° C or 80 to 120 ° C.

Here, the glass transition point of the resin can be measured by various known methods, for example, by measuring the resin of interest using a differential scanning calorimetry (DSC). It is possible to identify.

Further, the resin contained in the resin layer 30 according to the present embodiment has a dynamic storage elastic modulus E'and a dynamic loss elastic modulus E "ratio E'/ E" at 100 ° C. of 0.20 to 20. It is preferably 0.0. Since the resin contained in the resin layer 30 has the viscoelastic properties as described above, the resin follows the shape change that may occur in the aluminum plate 10 and the steel plate 20, and the shape change that may occur is more reliably mitigated. It becomes possible. The ratio E'/ E "between the dynamic storage elastic modulus E'and the dynamic loss elastic modulus E" at 100 ° C. is more preferably 0.40 to 15.0.

Here, the ratio E'/ E "between the dynamic storage elastic modulus E'and the dynamic loss elastic modulus E" as described above is the storage elastic modulus obtained by performing the dynamic viscoelastic modulus measurement under the following conditions. It can be confirmed from E'and the loss elastic modulus E'. That is, in such dynamic viscoelasticity measurement, a thermomechanical Analysis device is used, and the storage elastic modulus E'and the loss elastic modulus E'. To identify. At this time, the storage elastic modulus E'and the loss elastic modulus E'are measured in a nitrogen gas stream in a compression mode, 1 Hz, a temperature rise condition of 1 ° C./min, and a range of 25 to 200 ° C.

<About the adhesive layer 40>
The adhesive layer 40 according to the present embodiment is, if necessary, in order to further improve the adhesion between the resin layer 30 and the aluminum plate 10 or at least any one between the resin layer 30 and the steel plate 20. It is a layer provided.

The adhesive layer 40 is a layer mainly composed of components derived from the adhesive. The adhesive used for forming the adhesive layer 40 is not particularly limited, and for example, an epoxy resin-based adhesive, a polyester resin-based adhesive, a urethane resin-based adhesive, or the like, or an adhesive obtained by mixing rubber or elastomer with these adhesives. Agents, adhesives imparted with conductivity, and the like can be used. Among the above, from the viewpoint of initial adhesive strength, the adhesive layer 40 preferably contains an epoxy resin-based adhesive or a urethane resin-based adhesive (that is, a thermosetting adhesive).

Further, it is preferable that the resin of the adhesive constituting the adhesive layer 40 has a chemical structure common to that of the resin in the resin layer 30. As a result, the initial adhesion between the adhesive layer 40 and the resin layer 30 can be further improved, and the adhesive strength of the composite member 1 can be further increased.

For example, the resin of the adhesive constituting the adhesive layer 40 may have a main skeleton common to the resin in the resin layer 30. Alternatively, the adhesive resin constituting the adhesive layer 40 may have a side chain functional group common to the resin in the resin layer 30.

The adhesive layer 40 as described above applies the adhesive as described above to the surface of the aluminum plate 10 or the steel plate 20 by a generally known coating method (for example, roll coating, curtain flow coating, air spray, airless spray). , Immersion, bar coating, brush coating, etc.), bonded to the resin layer 30 or the resin composition to be the resin layer 30, and then dried and solidified to form the resin layer 30.

<About the flatness of the composite member 1>
The composite member 1 according to the present embodiment has a specific resin layer 30 between the aluminum plate 10 and the steel plate 20 having a specific thickness, and as a result, excellent flatness can be maintained, resulting in heat soaking property and shape change. It is possible to achieve both the suppression and the suppression of the above. The flatness of the composite member 1 according to the present embodiment has a maximum strain of 3.0 mm or less. Here, the maximum strain is the maximum value of the value obtained by placing the composite member 1 on the surface plate and subtracting the thickness of the composite member 1 from the strain (wave or warp height) in an arbitrary direction and position. .. However, for the composite member 1 having a wave pitch of more than 1 m, it is applied to a length of 1 m at an arbitrary position. The maximum strain is preferably 2.0 mm or less, more preferably 1.6 mm or less, still more preferably 1.2 mm or less, and even more preferably 1.0 mm or less.

As described in detail below, the flatness as described above is realized by undergoing a straightening step carried out at a specific timing in the method for manufacturing the composite member 1 according to the present embodiment.

<Use of composite member 1>
As described above, the composite member 1 according to the present embodiment can be used for a device that generates heat during operation. Since the composite member 1 according to the present embodiment can more reliably suppress the shape change due to the heat generated during manufacturing and use, it can be used for a device that generates heat during operation. You can fully demonstrate its performance.

Here, as devices that generate heat during operation, for example, parts for home appliances such as display panels typified by organic EL display panels, and various batteries such as Li-ion battery cells, fuel cell cells, and solar cell cells. A cell or the like can be mentioned.

As described above, the composite member 1 according to the present embodiment has been described in detail with reference to FIGS. 1A to 2B.

(About the manufacturing method of composite members)
Subsequently, a method for manufacturing the composite member 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a flow chart showing an example of the flow of the manufacturing method of the composite member 1 according to the present embodiment.

As shown in FIG. 3, the method for manufacturing the composite member 1 according to the present embodiment includes an adhesive application step (step S11), a laminate crimping step (step S13), a straightening step (step S15), and a solidification step. (Step S17) and. Here, the adhesive coating step (step S15) is a step performed as necessary when forming the adhesive layer 40, and is an adhesive coating step in the method for manufacturing the composite member 1 according to the present embodiment. (Step S11) does not have to exist.

<Adhesive application process>
The adhesive application step (step S11) is a step of applying the above-mentioned adhesive to at least one surface of the aluminum plate 10 or the steel plate 20. By providing such a coating step, the adhesive layer 40 is provided at least between the aluminum plate 10 and the resin layer 30 of the composite member 1 to be manufactured, or between the steel plate 20 and the resin layer 30. It becomes possible.

Here, the adhesive used is as described above, and the coating method used is also as described above.

<Laminate crimping process>
In the laminating crimping step (step S13), the resin composition in a molten state is injected into the gap between the aluminum plate 10 and the steel plate 20 arranged apart from each other, and the aluminum plate 10 and the steel plate 20 are crimped. It is a process to make it. Here, since the resin composition to be injected is as described above, detailed description thereof will be omitted below. Further, when a steel plate on which the plating layer 203 or the coating film layer 205 is formed is used as the steel plate 20, the plating layer 203 or the coating film layer 205 is obtained with respect to the base steel plate 201 prior to the laminating pressure bonding step. Is formed. As a method of laminating crimping, a known method may be used. For example, a method of injecting a resin composition in a molten state while holding a gap between the aluminum plate 10 and the steel plate 20 at a predetermined interval may be mentioned. Alternatively, a method may be used in which a molten resin composition is previously applied to the surface of the aluminum plate 10 or the steel plate 20 and then the other metal plate is crimped.

<Correction process>
As described above, the resin composition in a molten state is injected into the gap between the aluminum plate 10 and the steel plate 20, and the aluminum plate 10 and the steel plate 20 are pressure-bonded to have the resin composition. Due to the difference in the amount of heat generated and the coefficient of linear expansion between the aluminum plate 10 and the steel plate 20, the composite member 1 undergoes a shape change such as warpage during the cooling process or the like. Therefore, in the straightening step (step S15) according to the present embodiment, when the surface temperature of the composite member 1 is within the range of 180 ° C. or higher than the glass transition point of the resin contained in the resin composition, the composite member 1 Correct the shape of. However, when the glass transition point of the resin contained in the resin composition is 0 ° C. or lower, the shape of the composite member 1 shall be corrected when the temperature is within the range of normal temperature or higher and 180 ° C. or lower.

Here, when the straightening step is performed at the timing when the surface temperature of the composite member 1 exceeds 180 ° C., the heat of the resin composition is too high, and the aluminum plate 10 is combined with the aluminum plate 10 in the cooling process after straightening. It is not preferable because the strain caused by the difference in the linear expansion coefficient of the steel sheet 20 further warps and the shape may change again after the straightening step. On the other hand, when the straightening step is performed at the timing when the surface temperature of the composite member 1 is lower than the glass transition point Tg of the resin, the resin in the glass state cannot sufficiently relieve the internal stress by the straightening, and the composite member is manufactured. The flatness of 1 cannot be maintained. Therefore, the surface temperature of the composite member 1 needs to be equal to or higher than the glass transition point Tg of the resin. Further, in order to reduce the strain caused by the difference in the coefficient of linear expansion between the aluminum plate 10 and the steel plate 20 in the cooling process after straightening, straightening at a lower temperature is preferable. Therefore, in order to improve the flatness of the composite member 1 and prevent the shape change during use of the device, a resin having a glass transition point Tg of 50 to 120 ° C. is used, and the surface temperature of the composite member 1 is 120 ° C. to It is more preferable to correct at a timing within the range of 140 ° C.

The method for correcting shape changes such as warpage occurring in the aluminum plate 10 and the steel plate 20 is preferably a roller leveler having a degree of processing of 5 or more. Here, the maximum value of the curvature given between each straightening roller constituting the roller leveler is set to e (assuming that the material to be straightened is flat), and the elastic limit curvature of the material to be straightened is set to ey. Occasionally, the dimensionless amount (e / ey) obtained by dividing the maximum value e of the curvature by the elastic limit curvature ey is defined as the degree of processing by the roller leveler. By using a roller leveler to correct the shape change of the composite member 1 that is caused by the heat during manufacturing as described above, the flatness is better when the composite member 1 is manufactured. Can be realized.

Further, in the straightening process as described above, processing conditions that can remove residual stress during cutting plate processing are preferable. That is, it is preferable to perform cutting plate processing immediately after the above-mentioned straightening on the same production line. If straightening is performed after the cutting plate is processed, sufficient straightening strain cannot be given to the tip or tail end at the time of straightening, and there is a concern that the flatness of the tip or tail end may deteriorate, which is not preferable. Further, if the coil is wound after the straightening, the shape is curved due to the winding, so that the coil cannot be wound after the straightening.

<solidification process>
The solidification step (step S17) is a step of solidifying the resin composition located between the aluminum plate 10 and the steel plate 20 to form the resin layer 30. Here, solidifying the resin composition means cooling the temperature of the resin composition to less than the glass transition point Tg. Here, when the glass transition point Tg of the resin of interest is less than 0 ° C., the resin composition is cooled to less than the glass transition point Tg of less than 0 ° C. As a result, the composite member 1 having a laminated structure of an aluminum plate 10 / a resin layer 30 / a steel plate 20 is manufactured. When the adhesive is applied to the surface of the aluminum plate 10 or the steel plate 20, the adhesive is solidified by the solidification step to form the adhesive layer 40. It is troublesome to cool the composite member 1 to less than 0 ° C., and it is preferable to use a resin composition having a glass transition point Tg of 50 ° C. or higher.

Here, when the molten resin is cooled and solidified to form the resin layer 30, it is preferable to control the cooling rate. If the cooling rate is high, a temperature distribution occurs in the resin layer 30, which causes strain. That is, the cooling rate in the solidification step of the molten resin is preferably small, specifically, for example, 5 ° C./min or less.

After the laminating crimping step, a weight is placed on at least one surface of the aluminum plate 10 or the steel plate 20 (a load is applied), or after the laminating crimping step, a straightening step and a solidification step are carried out while being pressed. Can also be considered. However, as a result of studying these steps by the present inventors, it was not possible to achieve the desired flatness in such steps.

As described above, the manufacturing method of the composite member 1 according to the present embodiment has been described with reference to FIG.

(About equipment in which composite member 1 is used)
By using the composite member 1 according to the present embodiment as described above and the device that generates heat during operation, the following devices can be realized.
That is, the device according to the present embodiment is located in a state where at least a part of the composite member 1 as described above is in contact with the surface of the composite member 1 on the side of the aluminum plate 10, and generates heat as it operates. With a device.

Here, as devices that generate heat during operation, for example, various parts for home appliances such as display panels typified by organic EL display panels, Li-ion battery cells, fuel cell cells, solar cell cells, and the like. A battery cell and the like can be mentioned. For example, by combining the organic EL display panel and the composite member 1, a display device called an organic EL display can be realized. Further, various battery devices can be realized by combining various battery cells such as a Li-ion battery cell, a fuel cell, and a solar cell with the composite member 1.

In the following, referring to FIG. 4, an organic EL display realized by combining the composite member 1 and the organic EL display panel will be described as an example.

As schematically shown in FIG. 4, the organic EL display 500 as an example of the display device includes the composite member 1 according to the present embodiment, the organic EL display panel 3, and further, the organic EL. It may have an electronic board 5 for performing drive control of the display panel 3.

Here, as shown in FIG. 4, the organic EL display panel 3 is provided on at least a part of the surface of the composite member 1 on the aluminum plate 10 side, and the electronic substrate 5 is the surface of the composite member 1 on the steel plate 20 side. It is provided in at least a part of.

Here, by providing the organic EL display panel 3 on the aluminum plate 10 side of the composite member 1, it is possible to quickly conduct the heat generated by the organic EL display panel 3 by the aluminum having high thermal conductivity. .. That is, since the composite member 1 itself according to the present embodiment has sufficient heat conduction, it is possible to reliably ensure the heat equalization property in the display surface of the organic EL display panel 3. In addition, since the composite member 1 according to the present embodiment has excellent flatness, the organic EL display panel 3 can be joined to the composite member 1 in a more desirable state, and the organic EL display panel 3 can be joined. It is possible to improve the adhesion between the composite member 1 and the composite member 1, and it is possible to conduct heat evenly.

Further, by using the composite member 1 according to the present embodiment, it is possible to prevent the composite member 1 from changing its shape due to the heat generated by the operation of the organic EL display panel 3, so that the organic EL display panel can be prevented from being changed in shape with the operation. Even if heat is generated in 3, the generated heat can be more reliably conducted to the composite member 1 side, and the preferable operating state of the organic EL display panel 3 can be maintained.

As described above, the apparatus in which the composite member 1 according to the present embodiment is used has been described in detail with reference to FIG.

Hereinafter, the composite member, the method for manufacturing the composite member, and the device according to the present invention will be specifically described with reference to Examples and Comparative Examples. The examples shown below are merely examples of the composite member and the method and device for manufacturing the composite member according to the present invention, and the composite member and the method and device for manufacturing the composite member according to the present invention are limited to the following examples. It's not a thing.

In the examples shown below, a commercially available aluminum plate having a desired thickness is prepared as the aluminum plate 10, and the following three types of steel plates (manufactured by Nippon Steel Corporation) having a desired thickness are prepared as the steel plate 20. Got ready.

ZL-HL: Electric Zn-Ni alloy plated steel sheet with hairline processing. A clear coating with a thickness of 6 μm has been formed on the surface of the steel plate.
GI-PCM: Hot-dip galvanized steel sheet. A coating film layer with a thickness of 20 μm (primer coating film: 5 μm + top coating film: 15 μm) has been formed on the surface of the steel sheet.
CR-Painting: Cold-rolled steel sheet. The surface of the steel sheet was subjected to chemical conversion treatment using zinc phosphate, and further powder coated with a thickness of 50 μm.

As a resin composition for forming the resin layer 30, a commercially available resin shown below was prepared. The glass transition point Tg and the viscoelastic property (dynamic storage elastic modulus E', dynamic loss elastic modulus E ") of the resin used were measured by the method described above.

PE: Polyethylene resin (Novatec HD HF560 manufactured by Japan Polyethylene Corporation)
EP: Epoxy resin (1009 manufactured by Mitsubishi Chemical Corporation)
PES: Polyester resin (SI-173 manufactured by Toyobo Co., Ltd.)
UR: Urethane resin (PANDEX T-5765D manufactured by DIC Covestro Polymer Co., Ltd.)

Further, when forming the adhesive layer 40, a commercially available adhesive containing an epoxy resin as a main component (TB1655 manufactured by ThreeBond Co., Ltd.) was used.

An adhesive was applied to the surfaces of the aluminum plate 10 and the steel plate 20 as needed, and then a thermocouple for measuring the surface temperature of the aluminum plate 10 and the steel plate 20 was installed. After that, the aluminum plate 10 and the steel plate 20 are arranged apart from each other so as to have a desired thickness of the resin layer 30, and the molten resin composition is injected into the gap between the aluminum plate 10 and the steel plate 20. , The composite member 1 was manufactured.

At this time, the shape of the composite member 1 was corrected by using a roller leveler at the timing when the surface temperature of the composite member 1 reached a desired temperature. At this time, the degree of processing by the roller leveler was all 5. After such correction, the resin composition was solidified by cooling to a temperature lower than the glass transition point Tg so that the cooling rate was 5 ° C./min to produce a composite member. The shape of the composite member 1 is rectangular, and the width-height ratio (width: height is 16: 9. The diagonal length of the composite member 1 is 60 inches (1524 mm).

The obtained composite members were evaluated from the viewpoints of maximum strain, soaking property, steepness, shape change during use, press workability, and color unevenness, and are summarized in Table 1 below. The details of the evaluation contents are as follows.

<Maximum strain>
The maximum strain of the obtained composite member was measured in any direction.

<Heat soaking property>
From the obtained composite member, a sample of 70 mm × 180 mm was prepared. A rubber heater was attached to one end of the aluminum plate 10 side, the output of the heater was kept constant at 3.4 W for 30 minutes, and the temperature was measured from the steel plate 20 side every 50 mm from the end. The temperature difference ΔT between the temperature of the heater and the temperature at a position 150 mm away from the end was calculated. Based on the obtained temperature difference ΔT, evaluation was performed according to the following criteria. Scores S to B were passed.
S: ΔT 15 ° C or less A: ΔT 15 ° C or more and 25 ° C or less B: ΔT 25 ° C or more and 35 ° C or less C: ΔT 35 ° C or less

<Steepness>
With respect to the obtained composite member, the maximum strain was measured on the surface plate in the same manner as described above, and the pitch, which is the interval at which the strain appears, was measured. From the obtained maximum strain and pitch, steepness (%) = (maximum strain ÷ pitch) × 100 was calculated, and based on the obtained steepness, evaluation was performed according to the following criteria. Scores S to B were passed.
S: steepness 0.5% or less A: steepness more than 0.5% 1.0% or less B: steepness more than 1.0% 2.0% or less C: steepness more than 2.0%

<Shape change during use>
Imitation of the case where the obtained composite member is joined to the organic EL display panel, a test body as shown in FIG. 5 was prepared and evaluated as follows.

The obtained composite member was cut into dimensions having a width of 380 mm and a height of 285 mm. After that, the steel plate 20 side of the composite member was placed vertically on the hot-dip galvanized steel plate having a thickness of 0.8 mm adjusted to the same dimensions (see the upper figure of FIG. 5), and the four sides of the composite member were installed. Was sandwiched between commercially available angles (see the lower figure in FIG. 5). Then, the composite member and the hot-dip galvanized steel sheet were fixed by using a screw as a means for fixing the composite member and the hot-dip galvanized steel sheet. A halogen heater was arranged on the aluminum plate 10 side of the composite member so as to be non-contact, and the aluminum plate 10 was heated. The maximum displacement when the surface temperature of the aluminum plate 10 reached 50 ° C. was measured by a laser displacement meter. Based on the maximum displacement obtained, evaluation was performed according to the following criteria. Scores S to B were passed.
S: Maximum displacement 0.5 mm or less A: Maximum displacement 0.5 mm or more and 1.0 mm or less B: Maximum displacement 1.0 mm or more and 1.8 mm or less C: Maximum displacement 1.8 mm or less

<Press workability>
The obtained composite member was extruded with an Eriksen testing machine (based on JIS Z 2247) until the test piece broke so that the aluminum plate 10 side was concave. The maximum extrusion height D (unit: mm) at which cracks occur was determined. Based on the obtained height D, evaluation was performed according to the following criteria. Scores S to B were passed.
S: Height D 7 mm or more A: Height D 5 mm or more and less than 7 mm B: Height D 3 mm or more and less than 5 mm C: Height D less than 3 mm

<Color unevenness>
The aluminum plate 10 side of the obtained composite member 1 was joined to an organic EL display panel manufactured by Sony Corporation. After setting half of the display screen of the organic EL display to red and the other half to black, the organic EL display was displayed continuously for one hour. After that, the logo of Nippon Steel Corporation (the logo of Nippon Steel Corporation is a logo based on blue) was displayed in the center of the display screen, and the appearance of blue was visually judged by 10 people. .. Based on the number of people who felt the difference in color, the evaluation was made according to the following criteria. Scores S to B were passed. In addition, No. in Table 1 below. In 10 and 23, the evaluation result of "-" means that the evaluation could not be performed because the shape when processed was bad and could not be incorporated into the organic EL display panel.
S: 0 people A: 1, 2, 3 people B: 4, 5, 6 people C: 7 people or more

As is clear from Table 1 above, the composite member corresponding to the embodiment of the present invention has excellent heat soaking property and press workability, and while the shape change during manufacturing and use is suppressed, the present invention is used. It can be seen that the composite member corresponding to the comparative example fails in any of the heat soaking property, the press workability, and the shape change during manufacturing or use.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person having ordinary knowledge in the field of the art to which the present invention belongs can come up with various modifications or modifications within the scope of the technical idea described in the claims. , These are also naturally understood to belong to the technical scope of the present invention.

1 Composite member 3 Organic EL display panel 5 Electronic substrate 10 Aluminum plate 20 Steel plate 30 Resin layer 40 Adhesive layer 201 Base steel plate 203 Plating layer 205 Coating layer 500 Organic EL display

Claims (12)

With an aluminum plate,
Steel plate and
A resin layer interposed between the aluminum plate and the steel plate,
It is a composite member provided with
The thickness t _A of the aluminum plate is 0.20 to 1.60 mm, and the thickness t A is 0.20 to 1.60 mm.
The thickness t _B of the steel sheet is 0.15 to 1.20 mm, and the thickness t B is 0.15 to 1.20 mm.
The total thickness t _T of the composite member is 1.50 to 5.00 mm.
The thickness t _A of the aluminum plate is a composite member having a thickness t _B or more of the steel plate. The composite member according to claim 1, wherein the flatness of the composite member is such that the maximum strain in an arbitrary direction is 3.0 mm or less. The composite member according to claim 1 or 2, wherein the flatness of the composite member is such that the maximum strain in an arbitrary direction is 2.0 mm or less. The composite member according to any one of claims 1 to 3, wherein the ratio t _A / t _B of the thickness t _A of the aluminum plate to the thickness t _B of the steel plate is 1.10 to 3.30. Claim 1 that the thickness t _A of the aluminum plate, the thickness t _B of the steel plate, and the total thickness t _T of the composite member satisfy the relationship of (t _A + t _B ) / t _T ≤ 0.65. The composite member according to any one of 4 to 4. The composite member according to any one of claims 1 to 5, wherein the resin layer contains a polyethylene resin or an epoxy resin. The composite member according to any one of claims 1 to 6, wherein the glass transition point Tg of the resin contained in the resin layer is 0 ° C. or lower, or 50 to 180 ° C. The ratio E'/ E "between the dynamic storage elastic modulus E'and the dynamic loss elastic modulus E" at 100 ° C. of the resin contained in the resin layer is 0.20 to 20.0, claim 1. The composite member according to any one of 7 to 7. The composite member according to any one of claims 1 to 8, further comprising an adhesive layer between the resin layer and the aluminum plate, or at least between the resin layer and the steel plate. .. The composite member according to any one of claims 1 to 9, wherein the steel sheet has a plating layer located on at least one surface and a coating film layer located on the plating layer. The composite member according to any one of claims 1 to 10, and the composite member.
A device that generates heat during operation and is located in a state where at least a part of the composite member is in contact with the surface of the composite member on the aluminum plate side.
Have, equipment. The device that generates heat during the operation is an organic EL display panel.
The device according to claim 11, wherein the device is an organic EL display.

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