Aluminum foil, electronic device, roll-to-roll aluminum foil, and method of producing aluminum foil

Patent metadata

Field	Value
Publication number	US-10166580-B2
Application number	US-201615544690-A
Country	US
Kind code	B2
Filing date	Jan 22, 2016
Priority date	Feb 3, 2015
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

An aluminum foil includes a first main surface and a second main surface located opposite to the first main surface. In at least one of the first main surface and the second main surface, a surface roughness Ra is not more than 10 nm, a surface roughness Rz is not more than 40 nm in each of a rolling direction and a direction perpendicular to the rolling direction, and the number of peak counts is not less than 10 when a reference length is 40 μm, the number of peak counts being determined from a roughness curve in at least one of the rolling direction and the direction perpendicular to the rolling direction.

First claim

The invention claimed is:

1. An aluminum foil comprising a first main surface and a second main surface located opposite to the first main surface,
in at least one of the first main surface and the second main surface, a surface roughness Ra being not more than 10 nm, a surface roughness Rz being not more than 40 nm in each of a rolling direction and a direction perpendicular to the rolling direction, the number of peak counts being not less than 10 when a reference length L is 40 μm, the number of peak counts being determined from a roughness curve in at least one of the rolling direction and the direction perpendicular to the rolling direction.

2. The aluminum foil according to claim 1 , wherein a static friction coefficient is not more than 1.0 in the at least one of the first main surface and the second main surface.

3. The aluminum foil according to claim 1 , wherein a dynamic friction coefficient is not more than 0.8 in the at least one of the first main surface and the second main surface.

4. The aluminum foil according to claim 1 , wherein the aluminum foil has a thickness of not less than 4 μm and not more than 200 μm.

5. An electronic device comprising:
the aluminum foil recited in claim 1 ; and
a function element formed on the aluminum foil.

6. A roll-to-roll aluminum foil comprising:
the aluminum foil recited in claim 1 ; and
a core around which the aluminum foil is wound in the form of a roll.

7. A method of producing the aluminum foil recited in claim 1 , the method comprising forming the aluminum foil by performing final finishing cold rolling to a target member at a rolling reduction ratio of not less than 35% using a reduction roll having a surface roughness Ra of not more than 40 nm.

Assignees

• Toyo Aluminium Kk

Inventors

• Shingu Akira
• Ooyagi Mitsunari

Classifications

• B21B1/40 Primary

  for rolling foils which present special problems, e.g. because of thinness · CPC title

• B21B1/22

  for rolling {plates, strips,} bands or sheets of indefinite length (B21B1/42 takes precedence) · CPC title

• B21B2003/001

  Aluminium or its alloys · CPC title

• B21B2261/14

  Roughness · CPC title

• B21B2267/10

  Roughness of roll surface · CPC title