Method of producing aluminum container from coil feedstock
View Patent ↗Aerosol cans, more particularly, aluminum aerosol cans made from disks of aluminum coil feedstock, are provided. A method for necking aerosol cans of a series 3000 aluminum alloy is also provided. The method prevents the cans from sticking in the necking dies and produces a can with a uniquely shaped profile. The aluminum aerosol cans that are produced have the attributes of strength and quality, while being produced at a cost that is competitive with steel aerosol cans.
1. A method of forming a one-piece aluminum can, comprising:
cutting a plurality of disks from a coil of series 3000 aluminum alloy approximately 0.51 mm thick;
drawing each of said disks at least once to form a cup;
reverse drawing each of said disks at least once to form a can having a bottom portion approximately 0.51 mm thick and a vertical side wall portion;
ironing said side wall portion of each can to a thickness of approximately 0.20 mm; and
sequentially processing said ironed cans through a series of necking dies selected to form a shoulder and neck each having a desired profile 1 wherein said sequentially processing comprises die necking each can with a first necking die having an angle of 0°30′0″ at the back of said first necking die.
2. A method of forming a one-piece aluminum can, comprising:
cutting a plurality of disks from a coil of series 3000 aluminum alloy approximately 0.51 mm thick; drawing each of said disks at least once to form a cup;
reverse drawing each of said disks at least once to form a can having a bottom portion approximately 0.51 mm thick and a vertical side wall portion;
ironing said side wall portion of each can to a thickness of approximately 0.20 mm; and
sequentially processing said ironed cans through a series of necking dies selected to form a shoulder and neck each having a desired profile wherein said sequentially processing comprises die necking each can with a first necking die having an angle of 0°30′0″ at the back of said first necking die and die necking each can with subsequent necking dies, at least certain of which have an angle of 3° at the back of said subsequent necking dies.
3. A method of forming a shoulder and neck in an aluminum can, comprising:
sequentially processing a can through a first series of up to 28 necking dies arranged in a first circular pattern, wherein said first series of necking dies includes a first necking die having an angle of 0°30′0″at the back of said first necking die; and
sequentially processing said can through a second series of up to 28 necking dies arranged in a second circular pattern to form a desired shoulder and neck.
4. The method of claim 3 additionally comprising curling said neck of said can.
5. The method of claim 3 additionally comprising forming threads in said neck of said can.
6. The method of claim 3 additionally comprising attaching a threaded outsert onto said neck of said can.
7. The method of claim 3 wherein said desired shoulder includes one of a tapered shoulder, rounded shoulder, flat shoulder, and oval shoulder.
8. The method of claim 3 additionally comprising brushing the exterior of said can.
9. The method of claim 3 wherein said first series of necking dies includes subsequent necking dies, at least certain of which have an angle of 3° at the back of said subsequent necking dies.
10. The method of claim 3 wherein said sequentially processing a can through a first series of necking dies includes processing said can through said first series of necking dies having non-movable center guides.
11. The method of claim 10 additionally comprising using compressed air with said first series of necking dies to aid in the removal of said can from each of said dies.
12. The method of claim 3 wherein said sequentially processing said can through a first and a second series of necking dies includes passing said can through a first and a second series of necking dies each having an internal length of at least 100 mm.
13. The method of claim 3 additionally comprising trimming the neck of said can after said can passes through a predetermined one of said necking dies in said first series.
14. A method of forming the top of an aluminum can, comprising:
sequentially processing a can through a series of necking dies selected to form a neck and shoulder each having a desired profile, said necking dies having an angle of between 0°30′0″ and 3° at the back of said necking dies.
15. The method of claim 14 additionally comprising curling said neck of said can.
16. The method of claim 14 additionally comprising forming threads in said neck of said can.
17. The method of claim 14 additionally comprising attaching a threaded outsert onto said neck of said can.
18. The method of claim 14 wherein said desired shoulder profile includes one of a tapered shoulder, rounded shoulder, flat shoulder, and oval shoulder.
19. The method of claim 14 additionally comprising brushing the exterior of said can.
20. The method of claim 14 wherein said series of necking dies includes a total of at least thirty different necking dies.
21. The method of claim 14 wherein said sequentially processing a can includes processing said can through a series of necking dies in which the first fourteen necking dies having non-movable center guides.
22. The method of claim 21 additionally comprises using compressed air with said first fourteen dies to aid in the removal of said can from each of said dies.
23. The method of claim 14 wherein said sequentially processing said can includes processing said can through a series of necking dies each having an internal length of at least 100 mm.
24. The method of claim 14 additionally comprising trimming the neck of said can after said can passes through a predetermined one of said necking dies.