IP Library › Granted Patent US 9,048,027
Granted Patent B2
US 9,048,027 · App. 13/966,357 · Granted Jun 2, 2015

Aluminum foil for aluminum electrolytic capacitor electrode and method for manufacturing the same

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Quick Facts
Patent No.
US 9,048,027
App. No.
13/966,357
Granted
Jun 2, 2015
Kind
B2
Abstract

A fluid dispersion obtained by mixing oxide particles and water is sprayed to a raw aluminum foil from a direction opposite to a travelling direction of the raw aluminum foil while the raw aluminum foil is allowed to travel. In this way, a roll-pressed mark of the raw aluminum foil is eliminated, and thus aluminum foil for aluminum electrolytic capacitor electrode is produced. Pyramidal-shaped recesses each having an acute angle tip are present all over a surface of the aluminum foil.

Claims (22)

1. A method for manufacturing aluminum foil for an aluminum electrolytic capacitor, the method comprising:

winding off raw aluminum foil having a roll-pressed mark; and

allowing the raw aluminum foil to travel, and spraying a fluid dispersion obtained by mixing oxide particles and water to the raw aluminum foil from a direction opposite to a traveling direction of the raw aluminum foil so as to eliminate the roll-pressed mark on the raw aluminum foil and to form pyramidal-shaped recesses, each having an acute angle tip, all over a surface of the raw aluminum foil.

2. The method according to claim 1 ,

wherein each of the oxide particles has a polyhedral shape having an acute angle.

3. The method according to claim 2 ,

wherein the fluid dispersion obtained by mixing oxide particles and water is obliquely sprayed to the surface of the raw aluminum foil.

4. The method according to claim 1 ,

wherein the recess is formed in a part at a depth of up to 15 μF from the surface of the aluminum foil.

5. The method according to claim 1 ,

wherein a tensile force is applied to the raw aluminum foil while allowing the raw aluminum foil to travel.

6. The method according to claim 1 ,

wherein the raw aluminum foil is allowed to travel along a travelling roller, and

the fluid dispersion obtained by mixing the oxide particles and water is sprayed to a portion immediately below from an upstream side of traveling with respect to a vertical center line of the travelling roller.

7. The method according to claim 1 , wherein a colorimetric value of the surface of the aluminum foil is enhanced as compared with a colorimetric value of the surface of the raw aluminum foil.

8. The method for according to claim 1 , wherein a hardness of the surface of the aluminum foil is enhanced as compared with a hardness of a surface of the raw aluminum foil.

9. The method according to claim 1 , wherein a capacitance of the aluminum foil is made to be 1.19 times or more as a capacitance of the raw aluminum foil.

10. A method for manufacturing electrode foil for an aluminum electrolytic capacitor, the method comprising:

winding off raw aluminum foil having a roll-pressed mark;

allowing the raw aluminum foil to travel, and spraying a fluid dispersion obtained by mixing oxide particles and water to the raw aluminum foil from a direction opposite to a traveling direction of the raw aluminum foil so as to eliminate the roll-pressed mark on the raw aluminum foil and to form pyramidal-shaped recesses, each having an acute angle tip, all over a surface of the raw aluminum foil, thereby producing aluminum foil for an aluminum electrolytic capacitor,

carrying out direct-current etching treatment on the aluminum foil for an aluminum electrolytic capacitor, and

carrying out forming treatment after the direct-current etching treatment.