Claims
- 1. A process of producing aluminum foil having dead fold foil characteristics with a yield strength of at least 89.6 MPa (13 ksi), and ultimate tensile strength of at least 103.4 MPa (15 ksi) and a Mullen rating of at least 89.6 kPa (13 psi) at a gauge of 0.0015 cm (0.0006 inch), which comprises casting an aluminum alloy to form an ingot, cold rolling the ingot to produce a cold worked sheet, interannealing the cold worked sheet, cold rolling the interannealed sheet to a final gauge sheet of foil thickness, and interannealing the final gauge sheet; wherein the aluminum alloy is selected to contain an amount of manganese in the range of 0.05 to 0.15% by weight, and the cold worked sheet is interannealed at a temperature in the range of 200 to 260° C.
- 2. The process of claim 1, wherein said cold worked sheet is interannealed at a temperature in the range of 230 to 250° C.
- 3. The process of claim 1, wherein said final gauge sheet is annealed at a temperature in the range of 250 to 325° C.
- 4. The process of claim 1, wherein said final gauge sheet is annealed at a temperature in the range of 260 to 290° C.
- 5. The process of claim 1, wherein said cast aluminum alloy has at least about 0.05% manganese in solid solution after interannealing.
- 6. The process of claim 1, wherein said cast aluminum alloy includes at least about 0.1% manganese and said interannealed sheet contains at least about 0.08% manganese in solid solution.
- 7. The process of claim 6, wherein said interannealed sheet contains at least about 0.095% manganese in solid solution.
- 8. The process of claim 1, wherein said cold worked sheet is interannealed at a temperature that produces an interannealed sheet that has at least about 0.05% manganese in solid solution, but is softened sufficiently to permit the sheet to be rolled to final gauge with a reduction in thickness of at least about 80% of the interannealed sheet.
- 9. A process of producing aluminum foil having dead fold foil characteristics with a yield strength of at least 89.6 MPa (13 ksi), and ultimate tensile strength of at least 103.4 MPa (15 ksi) and a Mullen rating of at least 89.6 kPa (13 psi) at a gauge of 0.0015 cm (0.0006 inch), which comprises casting an aluminum alloy to form an ingot, cold rolling the ingot to produce a cold worked sheet, interannealing the cold worked sheet at a temperature that produces an interannealed sheet that has at least about 0.05% manganese in solid solution, but is softened sufficiently to permit the sheet to be rolled to final gauge with a reduction in thickness of at least about 80%, cold rolling the interannealed sheet from a thickness of 0.05 to 0.005 cm (0.02 to 0.002 inches) to a final gauge of 0.0008 to 0.0025 cm (0.0003 to 0.001 inches), and annealing the final gauge sheet; wherein the aluminum alloy is selected to contain an amount of manganese in the range of 0.05 to 0.15% by weight, and the cold worked sheet is interannealed at a temperature in the range of 200 to 260° C.
- 10. A process in accordance with claim 9, wherein said interannealed sheet is cold rolled to a final gauge of about 0.0015 cm (0.0006 inches).
- 11. The process of claim 9, wherein said final gauge sheet is finally annealed at a temperature of about 250° C. to about 325° C.
- 12. The process of claim 1, wherein said aluminum alloy comprises at least 0.095% manganese by weight.
- 13. The process of claim 1, wherein said aluminum alloy contains from 0.095% to 0.125% manganese by weight, and said cold worked sheet is interannealed at a temperature between 230° C. and 250° C. to produce interannealed sheet containing at least 0.08% manganese in solid solution.
- 14. The process of any one of claims 1 to 13, wherein said aluminum alloy is selected to have an iron content of less than 0.8% by weight.
- 15. The process of any one of claims 1 to 13, wherein said aluminum alloy is selected to have an iron content in the range of 0.1 to 0.7% by weight.
- 16. A process of producing aluminum foil having dead foil characteristics with a yield strength of at least 89.6 MPa (13 ksi), and ultimate tensile strength of at least 103.4 MPa (15 ksi) and a Mullen rating of at least 89.6 kPa (13 psi) at a aguge of 0.0015 cm (0.0006 inch), wherein an aluminum alloy is continuously cast to form a continuous sheet, the continuous sheet is cold rolled to produce a cold worked sheet, the cold worked sheet is interannealed at a temperature in the range of 200 to 260° C., the interannealed sheet is cold rolled to final gauge sheet of foil thickness, and the final gauge sheet is annealed, wherein said aluminum alloy comprises 0.05 to 0.15% by weight manganese, 0.05 to 0.6% by weight silicon, 0.1 to 0.7% by weight iron, and up to 0.25% by weight copper, with the balance aluminum and incidental impurities.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of U.S. provisional application No. 60/075,102, filed Feb. 18, 1998.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/CA99/00138 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO99/42628 |
8/26/1999 |
WO |
A |
US Referenced Citations (5)
Foreign Referenced Citations (5)
Number |
Date |
Country |
60-033346 |
Feb 1985 |
JP |
06-145923 |
May 1994 |
JP |
WO 95 25825 |
Sep 1995 |
WO |
WO 97 36017 |
Oct 1997 |
WO |
WO 98 45492 |
Oct 1998 |
WO |
Non-Patent Literature Citations (2)
Entry |
Patent Abstracts of Japan, vol. 010, No. 310 (C-379), Oct. 22, 1986 & JP 61 119658 A (Sukai Alum KK), Jun. 6, 1986. |
Patent Abstracts of Japan, vol. 011, No. 381 (C-464), Dec. 12, 1987 & JP 62 149838 A (Showa Alum Corp.), Jul. 3, 1987. |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/075102 |
Feb 1998 |
US |