NZ625920B2 - Method for expanding the diameter of a metal container - Google Patents
Method for expanding the diameter of a metal container Download PDFInfo
- Publication number
- NZ625920B2 NZ625920B2 NZ625920A NZ62592012A NZ625920B2 NZ 625920 B2 NZ625920 B2 NZ 625920B2 NZ 625920 A NZ625920 A NZ 625920A NZ 62592012 A NZ62592012 A NZ 62592012A NZ 625920 B2 NZ625920 B2 NZ 625920B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- metal container
- curl
- section
- container
- die
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 181
- 239000002184 metal Substances 0.000 title claims abstract description 181
- 238000009966 trimming Methods 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 235000013361 beverage Nutrition 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000010409 ironing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000284 resting Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/12—Edge-curling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
- B21D51/2615—Edge treatment of cans or tins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
- B21D51/2615—Edge treatment of cans or tins
- B21D51/2623—Curling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
- B21D51/2646—Of particular non cylindrical shape, e.g. conical, rectangular, polygonal, bulged
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
method of forming a metal container comprises: curling outward a top edge of the metal container to form a curl and subsequently expanding a diameter of a first section of the metal container to form a first expanded section; wherein at least part of the first expanded section is below the curl. In some embodiments, the steps of curling outward a top edge of the metal container to form a curl and expanding a diameter of a first section of the metal container to form a first expanded section are performed in a single stroke of a single die. In some embodiments, the step of expanding a diameter of a first section of the metal container to form an expanded section is performed after the step of curling outward a top edge of the metal container to form a curl. n some embodiments, the steps of curling outward a top edge of the metal container to form a curl and expanding a diameter of a first section of the metal container to form a first expanded section are performed in a single stroke of a single die. In some embodiments, the step of expanding a diameter of a first section of the metal container to form an expanded section is performed after the step of curling outward a top edge of the metal container to form a curl.
Description
METHOD FOR EXPANDING THE DIAMETER OF A METAL CONTAINER
CROSS-REFERENCE TO RELATED APPLICATIONS
This patent application claims priority to U.S. Provisional Patent Application
No. 61/579,196, filed December 22, 2011, which is incorporated herein by reference in its
entirety.
BACKGROUND
In the container industry, substantially identically shaped metal beverage
containers are produced massively and relatively economically. In order to expand a
diameter of a container to create a shaped container or enlarge the diameter of the entire
container, often several operations are required using several different expansion dies to
expand each metal container a desired amount.
SUMMARY
A method of forming a metal container comprises: curling outward a top
edge of the metal container to form a curl and expanding a diameter of a first section of the
metal container to form a first expanded section; wherein at least part of the first expanded
section is below the curl.
The metal container may be any type of metal container including beverage
cans, bottles and cups, aerosol cans and food containers. The metal comprising the metal
container may be any metal known in the art including aluminum, aluminum alloys and
steel. The metal container can be made by any process known in the art including but not
limited to: drawing and ironing; impact extrusion; spin forming; draw and redraw; and deep
drawing.
In order to expand more efficiently, in some embodiments, contact between
the expansion die and the top edge of the metal container is avoided in at least some of the
expansion operations. One way to do this is to curl outward the top edge of the metal
container prior to at least some of the expansion operations.
Curling is a bending operation that bends the edge of the metal container.
Curling includes forming operations that create a curved rim on top of the metal container.
For the purposes of this patent application, curling also includes flanging and flaring the
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edge of the metal container. Curling may add stiffness to the metal container. In some
embodiments flanging creates a 90° bend in the metal container.
For the purposes of this patent application, a curl is a bend along the edge of
the metal container.
In some embodiments, the steps of curling outward a top edge of the metal
container to form a curl and expanding a first section of the metal container to form a first
expanded section are performed simultaneously.
In some embodiments, the steps of curling outward a top edge of the metal
container to form a curl and expanding a diameter of a first section of the metal container
to form a first expanded section are performed in a single stroke of a single die.
In some embodiments, the step of expanding a diameter of a first section of
the metal container to form an expanded section is performed after the step of curling
outward a top edge of the metal container to form a curl.
Some embodiments further comprise expanding a diameter of a second
section of the metal container to form a second expanded section after the first expanding
step.
Some embodiments, further comprise a step of expanding a diameter of a
third section of the metal container to form a third expanded section before the step of
curling outward a top edge of the metal container to form a curl.
In some embodiments, expanding the first section of the metal container is
accomplished using an expansion die. An expansion die is a die that when inserted into an
opening of a container increases the diameter of the container via mechanical force. In
some embodiments, the step of expanding a first section of the metal container to form an
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expanded section comprises inserting the expansion die into an open end of the metal
container.
In some embodiments, the diameter of the first section of the metal
container is expanded by at least 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50% by a
single land in a single stroke of a single expansion die.
In some embodiments, an original diameter of a metal container is expanded
by at least a 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50% by a single land in a
single stroke of a single expansion die without first narrowing the metal container.
In some embodiments, the top edge of the metal container is curled by one
of: a rotary curler and a die.
Some embodiments further comprise removing the curl from the top edge of
the metal container. In some embodiments, the curl is removed from the top edge of the
metal container by trimming the top edge of the metal container.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 depicts a cross-sectional side view of a pre-form metal container and
a cross-sectional side view of an expansion die capable of expanding the diameter of the
pre-form metal container and curling a top edge of the pre-form metal container;
Figure 2 depicts a cross-sectional side view of the pre-form metal container
of Figure 1 when the expansion die of Figure 1 is at the bottom of its stroke inside the metal
container;
Figure 3 depicts a cross-sectional side view of an expansion die;
Figure 4 depicts a cross-sectional side view of the expanded metal container
of Figure 2 when the expansion die of Figure 3 is at the bottom of its stroke inside the metal
container;
Figure 5 depicts a cross-sectional side view of a pre-form metal container and
a cross-sectional side view of an expansion die capable of expanding the diameter of the
pre-form metal container;
Figure 6 depicts a cross-sectional side view of the metal container of Figure 5
when the expansion die of Figure 5 is at the bottom of its stroke inside the metal container;
Figure 7 depicts a cross-sectional side view of an expansion die;
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Figure 8 depicts a cross-sectional side view of the expanded metal container
of Figure 6 when the expansion die of Figure 7 is at the bottom of its stroke inside the metal
container;
Figure 9 depicts a cross-sectional side view of an expansion die;
Figure 10 depicts a cross-sectional side view of the expanded metal container
of Figure 8 when the expansion die of Figure 9 is at the bottom of its stroke inside the metal
container;
Figure 11 depicts a side view of a metal container made according to one
embodiment of the invention;
Figure 12a depicts a partial cross-sectional side view of an expansion and
curling die used to form the metal container of Figure 11;
Figure 12b depicts a cross-sectional side view of the die of Figure 12a;
Figure 13a depicts a partial cross-sectional side view of an expansion die used
to form the metal container of Figure 11;
Figure 13b depicts a cross-sectional side view of the die of Figure 13a;
Figure 14a depicts a partial cross-sectional side view of an expansion and
curling die used to form the metal container of Figure 11; and
Figure 14b depicts a cross-sectional side view of the die of Figure 14a.
DESCRIPTION
For the purposes of this specification, terms such as top, bottom, below,
above, under, over, etc. are relative to the position of a finished metal container resting on
its base on a flat surface, regardless of the orientation of the metal container during
manufacturing or forming steps or processes. A finished metal container is a metal
container that will not undergo additional forming steps before it is used by an end
consumer. In some embodiments, the top of the container has an opening.
Referring to Figures 1-4, in one embodiment, a method of forming a metal
container 100 comprises: curling outward a top edge 102 of the metal container 100 to
form a curl 104; expanding a first section 106 of the metal container 100 to form an
expanded section 108; wherein at least part of the expanded section 108 is below the curl
104; wherein the curling and expanding are accomplished in a single stroke of a single die.
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Figure 1 shows a cross-section of a metal container 100 before having
undergone the step of curling outward a top edge 102 of the metal container 100 to form a
curl 104. The original diameter 114 is the diameter of the metal container 100 after it has
been formed via drawing and ironing or extrusion but before it has been shaped, i.e. what is
commonly known in the art as a pre-form metal container. In some embodiments, there is
no need to pre-stress the metal container 100 by narrowing or other means before it is
expanded.
Figure 1 also shows a cross-section of a first working surface 118 of a first
expansion die 116 before contacting the metal container 100. The first working surface 118
has a first land 124. A land is the portion of the working surface of an expansion die having
the largest outer diameter that contacts a section of a container. It is possible for a die to
have multiple working surfaces, each having a different land, each land having a different
outer diameter, wherein the land having the smallest outer diameter travels further into the
container than the land(s) having a larger outer diameter. The first expansion die 116 of
Figure 1 is dimensioned to expand the diameter of the metal container 100 and also to form
of curl 104 on the top edge 102 of the container 100.
Figure 2 shows the cross-section of the metal container 100 as the top edge
102 is being curled and the first section of the metal container 100 is being expanded to
form a first expanded section 108. The first expansion die 116 is shown at the bottom of its
stroke inside the metal container 100.
Figure 3 shows a second expansion die 120. The second expansion die 120
has a second working surface 122 and a second land 126.
Figure 4 shows the cross-section of the metal container 100 as a second
section 110 (shown in Figure 2) of the metal container 100 is being expanded to form a
second expanded section 112. The second expansion die 120 is shown at the bottom of its
stroke inside the metal container 100. In some embodiments, the stroke of the second
expansion die 120 extends to the bottom of the metal container 100 or proximate to the
bottom of the metal container 100.
Referring to Figures 5-10, in another embodiment, a method of forming a
metal container 200 comprises: curling outward a top edge 202 of the metal container 200
to form a curl 204; expanding a first section 206 of the metal container 200 to form a first
expanded section 208 after curling the top edge 202 of the metal container 200; wherein at
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least part of the first expanded section 208 is below the curl 204 and expanding a second
section 210 of the metal container to form a second expanded section 212; wherein at least
part of the second expanded section 212 is below the curl 204.
Figure 5 shows a cross-section of a metal container 200 before having
undergone the step of curling outward a top edge 202 of the metal container 200 to form a
curl 204. Figure 5 also shows a cross-section of a curling die 228 before it enters the metal
container 200. The curling die 228 is dimensioned to form the curl 204 on the top edge 202
of the container 200 as is well-known in the art.
Figure 6 shows the cross-section of the metal container 200 as the top edge
202 is being curled by the curling die 228. The curling die 228 is shown at the bottom of its
stroke inside the metal container 200.
Figure 7 shows a first expansion die 216 before it enters the metal container
200. The first expansion die 216 has a first working surface 218a and a first land 224a and a
second working surface 218b and a second land 224b each dimensioned to expand the
diameter of the metal container 200.
Figure 8 shows the cross-section of the metal container 200 as a first section
206, shown in Figure 6, of the metal container is being expanded to form a first expanded
section 208. The first expansion die 216 is shown at the bottom of its stroke inside the
metal container 200.
Figure 9 shows a second expansion die 220 before it enters the metal
container 200. The second expansion die 220 has a third working surface 222 and a third
land 226 dimensioned to expand the diameter of the metal container 200.
Figure 10 shows the cross-section of the metal container 200 as a second
section 210, shown in Figure 9, of the metal container 200 is being expanded to form a third
expanded section 212. The second expansion die 220 is shown at the bottom of its stroke
inside the metal container 200.
In another embodiment of the invention, a metal container is expanded
before a curl is formed, then expanded again after the curl has been formed. In yet another
embodiment of the invention, a metal container is expanded after a curl has been formed.
Then the curl is removed from the top of the container by trimming of the top edge of the
container. The metal container may be necked after the curl is removed. Necking can be
done by any means know in the arts such as described in US. Patent Nos. 4,512,172;
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4,563,887; 4,774,839; 5,355,710 and 7,726,165. In yet a further embodiment of the
invention, a metal container is necked before a curl is formed and expanded after the curl
has been formed.
In all of the embodiments above, the metal comprising the metal container
may be any metal known in the art including, but not limited to, aluminum and steel. The
metal container may or may not have a dome in the bottom or base of the metal container.
In some embodiments, the metal container is a one-piece metal container having a closed
bottom. In some embodiments, the metal container is comprised of multiple pieces of
metal seamed together. In some embodiments, a sidewall of the metal container has a
uniform thickness from top to near the bottom of the container. In some embodiments, a
sidewall of the metal container has a non-uniform thickness. In some embodiments, a
sidewall of the metal container is tapered so that the thickness of the sidewall is thinner at
the top of the container than the bottom of the container. In some embodiments, the
thickness of a sidewall of the metal container varies along the height of the sidewall. In
some embodiments, the sidewall is thicker at the top of the container than at a lower
sidewall portion of the container.
Curling outward the top edge of the metal container to form a curl may be
accomplished by any means known in the art such as die curling and rotary curling. As
shown in Figures 1 and 2 the step of curling outward a top edge of the metal container may
be accomplished by inserting a curling die into the metal container at least until the top
edge of the container curls outwardly.
In some embodiments, the presence of a curl prevents the formation of lüder
lines during subsequent expansion steps allowing for increased expansion in a single
expansion step without damage to the metal container. In some embodiments, the
presence of a curl also reduces axial shortening of the metal container during expansion.
The radius of curvature of the curl and the angle of sweep of the curl affect the degree of
expansion possible without damaging the metal container in the subsequent expansion
step(s). In some embodiments, generally, the greater the radius of curvature of the curl, the
greater degree of expansion possible in the subsequent expansion step without damaging
the metal container. In some embodiments the angle of sweep of the curl is at least 90
degrees. In some embodiments the angle of sweep of the curl is at least 180 degrees. In
some embodiments the angle of sweep of the curl is at least 270 degrees. Increasing the
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radius and/or arc length of the curl generally allows increased expansion in a single
expansion step without damaging the metal container. In some embodiments, curls having
an angle of sweep less than 90 degrees straighten to some extent during subsequent
expansion, so that the angle of sweep is less after expansion. In some embodiments, curls
having an angle of sweep greater than 180 degrees tighten during subsequent expansion.
Expanding the metal container can be done by any means known in the art,
including, but not limited to inserting the working surface of an expansion die into an open
end of the metal container. Expanding using an expansion die can be performed any way
known in the art, including as described in U.S. Patent Nos. 7,934,410 and 7,954,354. As
shown in Figures 1 and 2 a single die can be used to both curl outward the top edge of the
container and expand a diameter of the metal container.
In some embodiments, after forming a curl, a 21 percent expansion in
diameter of a portion of the metal container by a single land in a single stroke of a single
expansion die is possible. In other embodiments, after forming a curl, an expansion of
diameter of a portion of the metal container of about 5%, 10%, 15%, 20%, 25%, 30%, 35%,
40%, 45% or 50% in a single expansion step by a single land in a single stroke of a single
expansion die is possible. Some embodiments can expand the diameter of a metal
container in one expansion step an amount that would require multiple expansion steps in
the prior art.
In some embodiments, the land of the expansion die(s) have an undercut
portion as shown in Figure 5 and as described in U.S. Patent Nos. 7,934,410 and 7,954,354.
In other embodiments, no undercut portion is necessary. The presence of the undercut in
the land of the expansion die enables more aggressive expansions of the metal container,
including the ability to take deeper/longer strokes with the expansion die.
In some embodiments, the land has a surface roughness average (Ra) ranging
from more than or equal to 8µin to less than or equal to 32µin, so long as the surface of the
land does not disadvantageously disrupt the aesthetic and/or functional features of an
inside coating on the metal container in a significantly observable manner, as described in
U.S. Patent Nos. 7,934,410 and 7,954,354.
In some embodiments, a knockout does not need to be used when expanding
the metal container. A knockout provides a surface for releasing a metal container from an
expansion die. In some embodiments, a pilot is used to control a top edge of a metal
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container. A pilot is a centering tool that controls movement of the top edge. In some
embodiments, after curling the top edge of the metal container, the original diameter of a
portion of the metal container is expanded by at least 5%, 10%, 15%, 20%, 25%, 30%, 35%,
40%, 45% or 50% by a single land in a single stroke of a single expansion die without a
knockout and/or without first narrowing the metal container.
Embodiments of the invention are also applicable to other types and sizes of
metal containers. For example, some embodiments may be used to form metal beverage,
aerosol and/or food containers.
In one example, an embodiment of the invention, as described with respect
to Figures 1-4, was used to make the metal container shown in Figure 11 using the dies
shown in Figures 12a, 12b, 13a, 13b, 14a and 14b. The die shown in Figures 12a and 12b
was the first die inserted into an aluminum pre-form container. As can be seen in Figures
12a and 12b, the die has three lands. The die in Figures 12a and 12b was inserted into the
aluminum pre-form container until the top edge of the container contacted the shoulder
shown in Figure 12b and a curl was formed. When the die shown in Figures 12a and 12b
was inserted into the aluminum pre-form container, the internal air pressure of the
container was 35 psi.
Next the die shown in Figures 13a and 13b was inserted into the expanded
and curled container. The die shown in Figures 13a and 13b also has three lands. When the
die shown in Figures 13a and 13b was inserted into the expanded and curled container, the
internal air pressure of the container was 35 psi.
Finally, the die shown in Figures 14a and 14b was inserted into the curled and
expanded container, resulting in the container shown in Figure 11. The die shown in Figures
14a and 14b only has one land. When the die shown in Figures 14a and 14b was inserted
into the expanded and curled container, the internal air pressure of the container was 60
psi.
Although the present invention has been described in considerable detail
with reference to certain versions thereof, other versions are possible. Therefore, the spirit
and scope of the appended claims should not be limited to the description of the versions
contained herein.
All features disclosed in the specification, including the claims, abstracts, and
drawings, and all the steps in any method or process disclosed, may be combined in any
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combination, except combinations where at least some of such features and/or steps are
mutually exclusive. Each feature disclosed in the specification, including the claims, abstract,
and drawings, can be replaced by alternative features serving the same, equivalent or
similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise,
each feature disclosed is one example only of a generic series of equivalent or similar
features.
Any element in a claim that does not explicitly state "means" for performing
a specified function or "step" for performing a specified function should not be interpreted
as a "means or step for" clause as specified in 35 U.S.C. § 112.
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Claims (17)
1. A method of forming a metal container comprising: curling outward a top edge of the metal container to form a curl; and after curling, inserting an expansion die into an open end of the metal container to form via the expansion die, a first expanded section; wherein at least part of the expanded section is below the curl; and wherein the metal container is a one‐piece container having a closed bottom.
2. The method of claim 1 further comprising expanding a diameter of a second section of the metal container to form a second expanded section.
3. The method of claim 1 further comprising expanding a diameter of a second section of the metal container to form a second expanded section prior to curling step (A).
4. The method of claim 1 wherein the diameter of the first section of the metal container is expanded by at least 5% in a single stroke of a single expansion die.
5. The method of claim 1 wherein an original diameter of the metal container is expanded by at least 5% is a single stroke of a single expansion die without prior narrowing of the metal container.
6. The method of claim 1 wherein the top edge of the metal container is curled by one of a rotary curler and a die.
7. The method of claim 1 further comprising removing the curl from the top edge of the metal container.
8. The method of claim 7 wherein the curl is removed from the top edge of the metal container by trimming the top edge of the metal container.
9. A method of forming a metal container comprising: (A) curling outward a top edge of the metal container to form a curl; wherein the metal container is a one‐piece container having a closed bottom; and (B) inserting an expansion die into an open end of the metal container to form a first expanded section; Wherein at least part of the expanded section is below the curl and wherein the curling step (A) and the inserting (B) are performed simultaneously; and NY 242684908v1 (C) after the curling step (A) and the inserting step (B), expanding the diameter of the first section of the metal container a second time, wherein the expanding step (C) is accomplished using an expansion die.
10. The method of claim 9 wherein the curling step (A) and the expanding step (B) are performed in a single stroke of a single die.
11. The method of claim 9 wherein the expanding step (C) comprises inserting an expansion die into an open end of the metal container.
12. The method of claim 9 wherein the diameter of the first section of the metal container is expanded by at least 5% in a single stroke of a single expansion die.
13. The method of claim 9 wherein an original diameter of the metal container is expanded by at least 5% is a single stroke of a single expansion die without prior narrowing of the metal container.
14. The method of claim 9 wherein the top edge of the metal container is curled by one of a rotary curler and a die.
15. The method of claim 9 further comprising (D) removing the curl from the top edge of the metal container.
16. The method of claim 15 wherein the curl is removed from the top edge of the metal container by trimming the top edge of the metal container.
17. A method of forming a metal container according to claim 1 , further comprising: forming via a single land, a single stroke of the expansion die, without first narrowing the metal container to form the first expanded section. NY 242684908v1
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201161579196P | 2011-12-22 | 2011-12-22 | |
US61/579,196 | 2011-12-22 | ||
PCT/US2012/070979 WO2013096636A2 (en) | 2011-12-22 | 2012-12-20 | Method for expanding the diameter of a metal container |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ625920A NZ625920A (en) | 2016-07-29 |
NZ625920B2 true NZ625920B2 (en) | 2016-11-01 |
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