Metal foil bonding device

Abstract

The present invention provides a metal foil bonding device that can uniformly heat a laminated metal foil, formed by bonding two metal foils together with an adhesive, by irradiating it with laser light, thereby suppressing unevenness in the adhesive strength of the adhesive. [Solution] A metal foil bonding apparatus 10 for bonding a second metal foil 2 to a first metal foil 1 to which an adhesive has been applied, comprising: a coating apparatus 4 for applying adhesive to the first metal foil 1; a laser light irradiation apparatus 8 for irradiating and heating the laminated metal foil 3, which is formed by bonding the second metal foil 2 to the first metal foil 1 to which the adhesive has been applied, with laser light; and a light absorbing member 9 positioned between the widthwise end of the laminated metal foil 3 and the laser light irradiation apparatus 8, which absorbs a portion of the laser light irradiated toward the widthwise end of the laminated metal foil 3.

Description

Technical Field

[0001] The present invention relates to an adhesive device for bonding and adhering two metal foils with an adhesive.

Background Art

[0002] When bonding and adhering two metal foils, heating of the adhesive may be necessary to ensure the adhesive strength of the adhesive. In Patent Document 1, after winding a laminated metal foil in which one metal foil coated with an adhesive is bonded to the other metal foil into a roll shape, a method of curing the adhesive by passing an electric current through the metal foil to generate heat is disclosed. Further, Patent Document 2 discloses a method of manufacturing a laminated metal foil by bonding metal foils to the front and back surfaces of a resin-impregnated base material respectively and then passing an electric current through the metal foils to generate heat.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a method of heating a laminated metal foil in which a second metal foil is bonded to a first metal foil coated with an adhesive, in addition to the method of passing an electric current through the metal foil, a method of irradiating the laminated metal foil with laser light can be considered. When irradiating the laminated metal foil with laser light for heating, even if the laser light is uniformly irradiated in the width direction of the laminated metal foil, heat can be conducted from the central portion in the width direction toward both sides in the width direction, but heat cannot be conducted from the right end portion in the width direction toward the right side in the width direction, and heat cannot be conducted from the left end portion in the width direction toward the left side in the width direction. Therefore, the temperature at both ends in the width direction tends to be higher than the temperature at the central portion in the width direction. When the temperature rise by laser light becomes non-uniform in this way, there is a risk of unevenness in the adhesive strength of the adhesive.

[0005] Therefore, the present invention aims to provide a metal foil bonding apparatus that can uniformly heat a laminated metal foil, which is formed by bonding two metal foils together with an adhesive, by irradiation with laser light, thereby suppressing unevenness in the adhesive strength of the adhesive. [Means for solving the problem]

[0006] The metal foil bonding apparatus according to the present invention is a metal foil bonding apparatus for bonding a second metal foil to a first metal foil to which an adhesive has been applied, and is characterized by comprising: a coating apparatus for applying the adhesive to the first metal foil; a laser light irradiation apparatus for heating the laminated metal foil, which is formed by bonding the second metal foil to the first metal foil to which the adhesive has been applied, by irradiating it with laser light; and a light absorbing member disposed between the widthwise end of the laminated metal foil and the laser light irradiation apparatus, which absorbs a portion of the laser light irradiated toward the widthwise end of the laminated metal foil. [Effects of the Invention]

[0007] The present invention provides a metal foil bonding apparatus that can uniformly heat a laminated metal foil, formed by bonding two metal foils together with an adhesive, by irradiating it with laser light, thereby suppressing unevenness in the adhesive strength of the adhesive. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view of a metal foil bonding apparatus according to an embodiment of the disclosure. [Figure 2] This is a cross-sectional view of AA in Figure 1. [Modes for carrying out the invention]

[0009] The metal foil bonding apparatus 10 of this embodiment will be described below with reference to Figures 1 and 2. Figure 1 is a side view of the metal foil bonding apparatus 10. The metal foil bonding apparatus 10 is an adhesive apparatus that manufactures laminated metal foil 3 by bonding a second metal foil 2 to a first metal foil 1 to which adhesive has been applied. As shown in Figure 1, the metal foil bonding apparatus 10 comprises a coating apparatus 4 for applying adhesive to the first metal foil 1, a roller 5 for bonding the second metal foil 2 to the first metal foil 1, a conveying apparatus 6 for conveying the laminated metal foil 3, and a winding rotating shaft 7 for winding up the laminated metal foil 3. The conveying apparatus 6 comprises a belt 61 on which the laminated metal foil 3 is placed and two rollers 62 for driving the belt 61.

[0010] The first metal foil 1 and the second metal foil 2 may, for example, have a thickness of 10 to 100 μm and a width of 1.0 to 1.5 m. The adhesive may also be applied to a thickness of, for example, 10 to 50 μm. In the metal foil bonding apparatus 10, the first metal foil 1 is unwound from the first roll 1a, which is wound in a roll shape, toward the conveying device 6. Then, the second metal foil 2 is unwound from the second roll 2a, which is wound in a roll shape, toward the roller 5. Before reaching the conveying device 6, the adhesive is applied to the surface of the first metal foil 1 by the coating device 4.

[0011] The second metal foil 2 is bonded to the first metal foil 1, which has adhesive applied to it, by the roller 5. The roller 5 rotates counterclockwise as shown in Figure 1, bonding the second metal foil 2 to the first metal foil 1 while transporting it to the right in Figure 1. The laminated metal foil 3, with the second metal foil 2 bonded to the first metal foil 1, is transported to the right in Figure 1 by the belt 61 of the transport device 6. The transport device 6 transports the laminated metal foil 3 on the belt 61 to the right in Figure 1 by rotating two rollers 62 clockwise as shown in Figure 1. The laminated metal foil 3 transported by the transport device 6 is wound into a roll by the rotation of the winding rotation shaft 7.

[0012] The metal foil bonding apparatus 10 includes a laser beam irradiation device 8 that heats the laminated metal foil 3 by irradiating it with a laser beam, and a light absorbing member 9. The laser beam irradiation device 8 irradiates the laminated metal foil 3 with laser light while it is being transported by the transport device 6. The amount of heat per unit area that the laser beam irradiation device 8 heats the laminated metal foil 3 is, for example, 0.7 to 1.0 W / cm². 2 This may also be the case. In this way, by irradiating the laminated metal foil 3 in transit with laser light using the laser light irradiation device 8, the adhesive is heated, and the adhesive strength of the adhesive bonding the first metal foil 1 and the second metal foil 2 can be ensured. Furthermore, by irradiating the laminated metal foil 3 with laser light using the laser light irradiation device 8 before it is wound into a roll, the metal foil bonding device 10 can be heated without being affected by heat conduction between the overlapping laminated metal foils 3, unlike when it is irradiated after it has been wound into a roll.

[0013] Figure 2 is a cross-sectional view of AA in Figure 1. Note that while the AA cross-section in Figure 1 includes cross-sections of two belts 61, upper and lower, the cross-section of the lower belt 61 is omitted in Figure 2. As shown in Figure 2, the light-absorbing members 9 are positioned between the widthwise end of the laminated metal foil 3 and the laser light irradiation device 8. One light-absorbing member 9 is positioned on each side of the widthwise direction of the laminated metal foil 3. The light-absorbing members 9 may be made of glass, for example.

[0014] The laser light emitted from the laser irradiation device 8 toward the light-absorbing member 9 is partially absorbed by the light-absorbing member 9, and partially transmitted through the light-absorbing member 9 and irradiated onto the widthwise edges of the laminated metal foil 3. Therefore, the amount of laser light irradiated per unit area onto the laminated metal foil 3 is less at the widthwise edges than at the widthwise center of the laminated metal foil 3. The light-absorbing member 9 is set to have a transmittance of the laser light emitted by the laser irradiation device 8 so that the laminated metal foil 3 heats up uniformly in the widthwise direction. Therefore, the metal foil bonding device 10 can prevent the widthwise edges of the laminated metal foil 3 from heating up more than the widthwise center, and can heat the laminated metal foil 3 uniformly by laser irradiation, thereby suppressing unevenness in the adhesive strength of the adhesive. [Explanation of symbols]

[0015] 1. First metal foil, 1a. First roll, 2. Second metal foil, 2a. Second roll, 3. Laminated metal foil, 4. Coating device, 5. Roller, 6. Conveying device, 7. Winding rotation shaft, 8. Laser light irradiation device, 9. Light absorbing member, 10. Metal foil bonding device, 61. Belt, 62. Roller.

Claims

[Claim 1] A metal foil bonding device for bonding a second metal foil to a first metal foil coated with adhesive, A coating apparatus for applying the adhesive to the first metal foil, A laser light irradiation device that heats a laminated metal foil, which is formed by bonding the second metal foil to the first metal foil to which the adhesive has been applied, by irradiating it with laser light. A light-absorbing member is positioned between the widthwise end of the laminated metal foil and the laser light irradiation device, and absorbs a portion of the laser light irradiated toward the widthwise end of the laminated metal foil. A metal foil bonding device characterized by comprising the following:

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