JPH0659710B2 - Conductive laminate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a conductive laminated plate in which a synthetic resin layer is provided between metal plates.

b. Conventional technology In recent years, for the purpose of weight reduction, soundproofing, antivibration, anticorrosion, etc. for automobiles, vehicles, home appliances, shipbuilding, building materials and other structures,
A laminated plate (for example, a laminated steel plate) in which a synthetic resin layer is interposed between metal plates (for example, steel plates) is used. For example, a synthetic resin layer of 0.1 mm or less is interposed between steel sheets to suppress vibration, and a synthetic resin layer of 0.1 mm or more is also used to reduce the weight.

Since these laminated plates have an intermediate layer made of a non-conductive synthetic resin, they have problems in welding and coating (electrostatic coating), and some conventional techniques for providing conductivity have been disclosed. ing. For example, a laminated plate having metal patterns on both sides provided with a convex pattern protruding toward the intermediate synthetic resin layer (Japanese Patent Laid-Open No. 58-847)
56, conventional example A), a sandwich laminated plate in which a metal net is provided in an intermediate synthetic resin layer (JP-A-58-132550, conventional example B), and either one of the metal plates is a modified plate. A laminated plate in which a contact portion is provided on a part of a metal plate (Japanese Patent Laid-Open No. 58-191154).
, JP-A-58-197045, conventional example C), a composite type vibration-damping steel plate that has been spot-welded prior to arc welding for producing products (JP-A-59-27794, conventional example D), A composite steel sheet in which one steel sheet is provided with a protrusion and is brought into contact with the other steel sheet through an intermediate layer (Japanese Patent Laid-Open No. 59-103748, conventional example E),
There is a laminated plate in which a conductive material is mixed in an intermediate synthetic resin layer and one metal plate is provided with a concavo-convex pattern (Japanese Patent Application Laid-Open No. 59-145142, Conventional Example F).

c. Problems to be Solved by the Invention In the above-mentioned conventional technique, the conventional examples A and C have conductivity, but the damping effect is poor, and the workability, which is an important factor in product manufacturing, is poor. There is a problem. Further, the conventional example B has a drawback that the weight is slightly heavy. Further, the conventional example D has a problem that the number of processes is large and the cost is increased. Further, in Conventional Example E, many deformed portions appear on the surface, and there are many restrictions in appearance. Furthermore, in Conventional Example F,
As the weight becomes heavier, the cost increases, and the conductivity is not always sufficient.

In view of the above circumstances, the present invention intends to provide a conductive laminated plate which solves the problems of the above-mentioned respective prior arts.

d. Means for Solving the Problems In order to solve the above problems, the present invention has a conductive metal layer on both outer sides and an intermediate layer made of a non-conductive synthetic resin material between the metal layers. Then, in a laminated plate in which a large number of conductive spheres are dispersedly provided in the intermediate layer, a synthetic resin material which is the same as or similar to that of the intermediate layer is used for the sphere, and a conductive coating is applied to the surface of the sphere In addition, the diameter of the sphere is made larger than at least the thickness of the intermediate layer, and the surface of the sphere is brought into contact with the inner surfaces of the metal layers on both outer sides.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a laminated plate, 2 is a steel plate arranged on both outer sides of the laminated plate 1,
A conductive metal plate such as a stainless steel plate, 3 is an intermediate layer made of a non-conductive material such as synthetic resin such as nylon, PP, PE or the like, and 4 is provided between the metal plates 2 together with the intermediate layer 3. Many spheres.

The spherical body 4 is composed of a spherical synthetic resin portion 10, and a conductive coating film 11 is coated on the spherical synthetic resin portion 10. As the material forming the synthetic resin portion 10, it is preferable to use a material having the same or similar property as that of the intermediate layer 3. The coating 11 is made of the same material as the metal plate 2 or a material having the same or similar melting point.

Now, D ₁ the diameter of the synthetic resin portion 10, when the diameter of the spherical body 4 after having been subjected to coating 11 was D _2, it is necessary that at least 0 satisfying the _{≦ D 1 <D 2, D} 1 Is preferably as close to D ₂ as possible.

Furthermore, when the thickness of the laminated plate 1 is T ₁ and the thickness of the intermediate layer 3 is T ₂ , it is necessary that at least T ₂ <D ₂ and this tends to cause the sphere to collapse slightly in the flat direction. Therefore, the contact area with the metal plate is increased, and the conductivity is improved. Further, it is preferable that the condition of D ₂ <T ₂ +2/3 (T ₁ −T ₂ ) is satisfied. By doing so, it is possible to suppress the generation of protrusions caused by the presence of the spherical body 4 on the surface of the metal plate 2.

Also, when the distance between the spheres 4 is l, 0 <l <10
It is preferable to set the mutual spacing of the spheres 4 so as to satisfy the condition of T _{2 to} 50T ₂ .

By satisfying the above conditions, the metal plates 2 on both sides
Has good conductivity through the conductive coating 11 of the sphere 4, and thus good weldability.

The coating 11 covering the sphere 4 may be a strong coating by a method such as plating, spraying a metal, or welding.

e. Effect of the Invention As described above, the laminated plate according to the present invention has a metal plate on both sides with a large number of spheres made of the same or similar synthetic resin as the intermediate layer having a conductive surface in the intermediate layer of the laminated plate. It is configured to come into contact with.

Therefore, since the sphere is composed of a material that weighs about the same as the intermediate layer, there is almost no increase in weight as a laminated plate, it has good conductivity, is easy to fit, and does not change the appearance. It doesn't hurt the sex.

Further, the distance (density) of the spheres arranged in the laminated plate can be changed depending on the size of trimming, and the cost is almost the same as that of the conventional laminated plate.

The present invention has a configuration in which the development of a lighter weight conductive laminated plate can be expected by using a lighter weight material for the intermediate layer.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view of a laminated plate according to the present invention, FIG. 2 is an enlarged sectional explanatory view of the same spherical portion, and FIG. 3 is an overall plan view of the laminated plate. 1 ... Laminated plate, 2 ... Metal plate, 3 ... Intermediate layer, 4 ... Sphere, 11 ... Coating.

Claims (1)

[Claims] 1. A conductive metal layer is provided on both outer sides, and an intermediate layer made of a non-conductive synthetic resin material is provided between the metal layers, and a large number of conductive spheres are dispersed in the intermediate layer. In the laminated plate, the same or similar synthetic resin material as the intermediate layer is used for the sphere, a conductive coating is applied to the surface of the sphere, and the diameter of the sphere is at least larger than the thickness of the intermediate layer. Then, the conductive laminated plate is characterized in that the surface of the sphere is brought into contact with the inner surfaces of the metal layers on both outer sides.