EP1294622B1 - Metal can being a pressure tight metal packaging and method for producing thereof - Google Patents
Metal can being a pressure tight metal packaging and method for producing thereof Download PDFInfo
- Publication number
- EP1294622B1 EP1294622B1 EP01951605A EP01951605A EP1294622B1 EP 1294622 B1 EP1294622 B1 EP 1294622B1 EP 01951605 A EP01951605 A EP 01951605A EP 01951605 A EP01951605 A EP 01951605A EP 1294622 B1 EP1294622 B1 EP 1294622B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- side wall
- metal
- thickness
- wall
- annular portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D83/00—Containers or packages with special means for dispensing contents
- B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
- B65D83/38—Details of the container body
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/12—Cans, casks, barrels, or drums
- B65D1/14—Cans, casks, barrels, or drums characterised by shape
- B65D1/16—Cans, casks, barrels, or drums characterised by shape of curved cross-section, e.g. cylindrical
- B65D1/165—Cylindrical cans
Definitions
- the invention relates to a metal can, being a pressure tight metal packaging and to a method for producing such a metal can according to the preambles of claims 1 and 11 respectively (see for example EP-A-0 667 193).
- the thickness of the side wall in its wall-to-closure transition portions is greater than the thickness in the main side wall portion.
- a metal can with improved vacuum performance is known.
- American patent US 3,951,296 discloses a wall-ironed container having a plurality of reinforcing ribs being spaced from the ends of the side walls and from each other, in order to achieve increased resistance against buckling of the side wall and having improved resistance against vacuum.
- the ribs are trapezium shaped, with a central surface parallel to the inside surface of the side walls having an axial length of 2,36 mm, and both wedging surfaces inclined at an angle of 24° from the inside surface of the side walls to the central surface of the reinforcing ribs.
- the ribs protrude inwards over a distance of 167 ⁇ m.
- the known ribs are formed in the side wall by means of ironing the side wall in an ironing ring against a punch in which grooves have been formed spaced from one another along the longitudinal axis of the punch.
- the side wall is passed through the ironing ring by which the side wall is reduced in thickness and elongated.
- the known can has satisfactory vacuum performance, but it is difficult to fabricate in a plural-ring ironing process. As the side wall elongates under the action of a second ironing ring, the reinforcing ribs move out of the respective grooves in which they were formed. Their destruction has to be prevented.
- the annular portion is considered to comprise also an annular portion in which substantial regions along the circumference have a side wall thickness that is greater than the side wall thickness in the main side wall portion outside the annular portion.
- the vacuum performance can be greatly enhanced by supporting the can wall only locally along its circumference by providing only one supporting annular portion, for instance a reinforcement rib, which forms part of the wall and is thus integrated therein.
- a side wall with only one reinforcement rib can be advantageously fabricated using multiple ironing steps in a plural-ring ironing process, since a formed rib will not be destructed by following ironing steps.
- a semi-product is known from European patent EP B 0 122 651, which semi-product comprises a can side wall which has a greater wall thickness in one annular centre portion than in the other portions of the side wall.
- this semi-product is first cut transversely across the annular centre region, before it is provided with a closure to form a metal can having a side wall with a greater wall thickness adjacent the closures than at other regions.
- the greater wall thickness is localised in the wall-to-closure transition portions of the can walls, for the formation of a flanged connection with the closure.
- the thus obtained cans do not have a circumferential rib in the main side wall portion of their walls.
- the annular portion is intersected along essentially the entire circumference by a cross sectional plane through the metal can, located halfway between the first wall-to-closure transition portion and the second wall-to-closure transition portion.
- a located rib provides the best vacuum performance of the metal can.
- the annular portion is a circumferential rib protruding inwardly from the inside surface of the side wall into the packaging. This has the advantage that the outside surface of the packaging is undisturbed.
- the side wall thickness in the annular portion is not more than 40 ⁇ m thicker than the side wall thickness in the remainder of the main side wall portion.
- the annular portion extends more than 40 ⁇ m from the main side wall of the packaging, it becomes problematic to strip the side wall from a wall ironing tool. For instance, stripping from a wall ironing punch becomes problematic in the case the annular portion protrudes into the packaging by more than 40 ⁇ m.
- the side wall thickness is not more than 30 ⁇ m thicker than the side wall thickness in the remainder of the main side wall portion.
- the stripping problems are limited to a more acceptable level.
- the side wall thickness is not more than 20 ⁇ m thicker than the side wall thickness in the remainder of the main side wall portion.
- the stripping behaviour of a side wall with an inward protrusion of 20 ⁇ m has been found to be approximately equal to that of a straight wall can.
- the annular portion comprises, when seen in a longitudinal section of the metal can, a portion wherein the side wall thickness is constant over an axial distance.
- the thickness of the side wall in the annular portion of the main side wall portion when seen in a longitudinal section of the metal can and measured at increasing distances from the first end closure, first gradually increases from the thickness of the side wall outside the annular portion to a maximum thickness of the side wall inside the annular portion over a section with an axial length D 1 , and then decreases from the maximum thickness to the thickness in the remainder of the main side wall portion outside the annular portion over a section with an axial length D 2 , which length is shorter than D 1 . This is done with regard to the stripping direction of the metal can side wall, and further improves the stripping behaviour from the wall ironing punch.
- the thickness of the side wall in a section of the annular portion of the main side wall portion measured at increasing distances from the first end closure, gradually increases from the thickness of the side wall outside the annular portion to a maximum thickness of the side wall inside the annular portion, in which section the surface of the side wall inside the packaging is wedged with respect to the corresponding surface of the side wall on the outside of the packaging at an angle between 0.01 and 5°.
- the lower limit of the range of angles is related to the available space between the annular portion and a wall-to-closure transition portion.
- the upper limit marks an angle above which it becomes increasingly problematic to strip the side wall from a wall ironing tool.
- this surface is wedged at an angle between 0.01 and 1°. Herewith, stripping problems are even better avoided.
- this surface is wedged at an angle between 0.01 and 0.25°.
- stripping behaviour can be approximately equal to that of a straight wall can.
- a can wall according to the invention may be manufactured by conventional drawing and wall ironing processes.
- the invention is also embodied in a method of forming a metal can wall according to the invention, as defined in claim 11.
- test cans and the reference cans T57 packaging steel grade was used. This is a regular material commercially supplied to the market to manufacture such cans.
- the second draw was carried out on a separate cupping press to the final diameter of 45 mm.
- a punch was used with diameter 44.917 mm. This punch was reground afterwards for a can of the second type with a step of 0.02 mm x 40 mm while changing the nominal diameter to 44.913 mm.
- a new tool steel punch was manufactured for a can of the third type with a step of 0.03 mm x 20 mm.
- the cans of the second type and the third type were provided with an inwardly protruding thicker wall portion. This has the advantage that the outside surface of the packaging is undisturbed.
- the transition zone length in front and at the end of the punch step was chosen to be different. This is done with regard to the stripping direction of the cans.
- a profile of the wall thickness of the different can types was made with a thickness scanner.
- the wall thickness profile of the cans with a step was also measured after the third die in order to check the effect of moving the thick wall by reducing the can in the fourth die, see Fig. 3 and table 2.
- the wall thickness between the different can types is approximately equal.
- the thickness of the step is 22 and 28 microns respectively. There is no measurable material displacement in the step, caused by the fourth die operation.
- T-bar force A force perpendicular to the centre line of the can, hereafter called the T-bar force, was applied on the wall of the can in the middle of the can height, i.e. where the test can according to the invention had a local annular wall portion with a greater thickness .
- the can was depressurised to different vacuum levels. For each vacuum level, ten cans were tested by increasing the T-bar force. In Fig. 5 the results are summarised.
- FIG. 5 represents an average of 10 measurements. Some cans from a can of the second and third type were tested by applying the force at a quarter of the can height, where the wall was thin.
- the vacuum performance of the second can type according to the invention is approximately equal to the performance of the reference can. That means that a local wall thickness increase according to the invention does increase the vacuum performance. Further, it is clear that the length of the thick wall also plays a role in increasing the vacuum performance.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Making Paper Articles (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Laminated Bodies (AREA)
- Stackable Containers (AREA)
- Cartons (AREA)
Abstract
Description
- A first type of a known can concept with a straight wall with a wall thickness of 0.15 mm.
- A second type of a can according to the invention with a wall thickness of 0.15 mm and a mid wall step of 0.02mm x 40mm, i.e. with H1 = 44 mm, H2 = 52 mm, H3 = 92 mm, H4 = 96 mm and X1 = 0.170 mm, see Fig. 2;
- A third type of a can according to the invention with a wall thickness of 0.15 mm and a mid wall step of 0.03mm x 20mm, i.e. with H1 = 50 mm, H2 = 62 mm, H3 = 82 mm, H4 = 88 mm and X1 = 0.180 mm, see Fig. 2.
- A fourth type of can commercially available in the market having a straight wall with a wall thickness of 0.167 mm was used as a reference.
Claims (11)
- Metal can, being a pressure tight metal packaging, comprising an ironed side wall stretching essentially along an axial direction and a circumferential direction, and a first end closure adjoining the side wall in a first wall-to-closure transition portion, and a second end closure adjoining the side wall in a second wall-to-closure transition portion, which side wall comprises a main side wall portion stretching from the first wall-to-closure transition portion to the second wall-to-closure transition portion, wherein the main side wall portion is provided with means of increased side wall thickness supporting the side wall essentially along the circumference of the can, consisting of one annular portion of wall ironed metal in which the thickness of the side wall is greater than the side wall thickness in the main side wall portion outside the annular portion, characterised in that the one annular portion comprises wall ironed metal that has been reduced in thickness by more than 39.4 %, and the side waD thickness in the annular portion is less than 40 µm thicker than the side wall thickness in the remainder of the main side wall portion.
- Metal can according to claim 1, characterised in that the one annular portion comprises wall ironed metal that has been reduced in thickness by more than 41.6 %, preferably by more than 45.1 %.
- Metal can according to claim 1 or 2, characterised in that the main side wall portion outside the annular portion comprises wall ironed metal that has been reduced in thickness by more than 50.6 %.
- Metal can according to claim 1, 2, or 3, characterised in that the main side wall portion comprises steel, preferably packaging steel.
- Metal can according to Claim 1, characterised in that the annular portion is intersected along essentially the entire circumference by a cross sectional plane through the metal can, located halfway between the first wall-to-closure transition portion and the second wall-to-closure transition portion.
- Metal can according to Claim 1 or 5, characterized in that the annular portion is a circumferential rib protruding inwardly from the inside surface of the side wall into the packaging.
- Metal can according to any one of the preceding claims, characterised in that the side wall thickness in the annular portion is not more than 28 µm thicker than, by preference not more than 22 µm thicker, than the side wall thickness in the remainder of the main side wall portion.
- Metal can according to any one of the preceding claims, characterised in that, when seen in a longitudinal section of the metal can, the annular portion comprises a portion wherein the side wall thickness is constant over an axial distance.
- Metal can according to any one of the preceding claims, characterised in that, when seen in a longitudinal section of the metal can, the thickness of the side wall in the annular portion of the main side wall portion, measured at increasing distances from the first end closure, first gradually increases from the thickness of the side wall outside the annular portion to a maximum thickness of the side wall inside the annular portion over a section with an axial length D 1, and then decreases from the maximum thickness to the thickness in the remainder of the main side wall portion outside the annular portion over a section with an axial length D 2, which length is shorter than D 1, and wherein the first end closure is integral to the side wall.
- Metal can according to any one of the preceding claims, characterised in that, the first end closure is integral to the side wall, and, when seen in a longitudinal section of the metal can, the thickness of the side wall in a section of the annular portion of the main side wall portion, measured at increasing distances from the first end closure, gradually increases from the thickness of the side wall outside the annular portion to a maximum thickness of the side wall inside the annular portion, in which section the surface of the side wall inside the packaging is wedged with respect to the corresponding surface of the side wall on the outside of the packaging at an angle between 0.01 and 5°, by preference at an angle between 0.01 and 1°, more by preference at an angle between 0.01 and 0.25°.
- Method of producing a metal can, being a pressure tight metal packaging, comprising an ironed side wall stretching essentially along an axial direction and a circumferential direction, and a first end closure adjoining the side wall in a first wall-to-closure transition portion, and a second end closure adjoining the side wall in a second wall-to-closure transition portion, which side wall comprises a main side wall portion stretching from the first wall-to-closure transition portion to the second wall-to-closure transition portion, wherein the main side wall portion is provided with means of increased side wall thickness supporting the side wall essentially along the circumference of the can, consisting of one annular portion of wall ironed metal in which the thickness of the side wall is greater than the side wall thickness in the main side wall portion outside the annular portion, the method comprising the steps of (i) producing cups in at least one drawing operation, (ii) reducing the side wall thickness using at least one ironing die and a punch having a forming contour in longitudinal cross section comprising an essentially straight section provided with a recess, the recess being provided for forming the annular portion, characterised in that the recess has a depth of less than 40 µm and thickness of the main side wall portion where the recess is located is reduced from at least 313.5 µm to less than 190 µm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01951605A EP1294622B1 (en) | 2000-06-16 | 2001-06-14 | Metal can being a pressure tight metal packaging and method for producing thereof |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00202102 | 2000-06-16 | ||
EP00202102 | 2000-06-16 | ||
EP00203942 | 2000-11-10 | ||
EP00203942 | 2000-11-10 | ||
PCT/EP2001/006865 WO2001096209A1 (en) | 2000-06-16 | 2001-06-14 | Metal can being a pressure tight metal packaging |
EP01951605A EP1294622B1 (en) | 2000-06-16 | 2001-06-14 | Metal can being a pressure tight metal packaging and method for producing thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1294622A1 EP1294622A1 (en) | 2003-03-26 |
EP1294622B1 true EP1294622B1 (en) | 2004-04-07 |
Family
ID=26072378
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01951605A Expired - Lifetime EP1294622B1 (en) | 2000-06-16 | 2001-06-14 | Metal can being a pressure tight metal packaging and method for producing thereof |
Country Status (12)
Country | Link |
---|---|
US (1) | US20040040970A1 (en) |
EP (1) | EP1294622B1 (en) |
CN (1) | CN1210194C (en) |
AT (1) | ATE263722T1 (en) |
AU (1) | AU769793B2 (en) |
BR (1) | BR0111728A (en) |
DE (1) | DE60102697T2 (en) |
DK (1) | DK1294622T3 (en) |
ES (1) | ES2218430T3 (en) |
PT (1) | PT1294622E (en) |
TR (1) | TR200401193T4 (en) |
WO (1) | WO2001096209A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7954354B2 (en) | 2006-06-26 | 2011-06-07 | Alcoa Inc. | Method of manufacturing containers |
US8322183B2 (en) | 2006-05-16 | 2012-12-04 | Alcoa Inc. | Manufacturing process to produce a necked container |
US9327338B2 (en) | 2012-12-20 | 2016-05-03 | Alcoa Inc. | Knockout for use while necking a metal container, die system for necking a metal container and method of necking a metal container |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008516854A (en) * | 2004-10-15 | 2008-05-22 | コラス・スタール・ベー・ブイ | Metal can |
KR20180050415A (en) | 2010-08-20 | 2018-05-14 | 알코아 유에스에이 코포레이션 | Shaped metal container and method for making same |
CN117884533A (en) * | 2024-03-15 | 2024-04-16 | 蜂巢能源科技股份有限公司 | Cover plate assembly forming process and cover plate |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0667193A1 (en) * | 1994-02-15 | 1995-08-16 | Toyo Seikan Kaisha Limited | Method of producing seamless cans |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1730434A (en) * | 1924-03-20 | 1929-10-08 | Mauser Barrel Co Inc | Packing container |
US3951296A (en) * | 1971-09-02 | 1976-04-20 | National Steel Corporation | Reinforced wall-ironed container |
DE2937001A1 (en) * | 1979-09-13 | 1981-04-02 | Schmalbach-Lubeca Gmbh, 3300 Braunschweig | METAL OPEN CONTAINER |
NL8301069A (en) * | 1983-03-28 | 1984-10-16 | Hoogovens Groep Bv | THREE-PIECE METAL PACKAGING BUSH, SEMI-PRODUCTION FOR THE MANUFACTURE OF THIS BUSH, AND A METHOD OF MANUFACTURING METAL PACKAGING BUSES. |
DE4443434A1 (en) * | 1994-12-06 | 1996-06-20 | Schmalbach Lubeca | Wall thickness distribution in the can mouth section |
US5938389A (en) * | 1996-08-02 | 1999-08-17 | Crown Cork & Seal Technologies Corporation | Metal can and method of making |
-
2001
- 2001-06-14 PT PT01951605T patent/PT1294622E/en unknown
- 2001-06-14 US US10/311,097 patent/US20040040970A1/en not_active Abandoned
- 2001-06-14 DE DE60102697T patent/DE60102697T2/en not_active Expired - Lifetime
- 2001-06-14 AU AU72488/01A patent/AU769793B2/en not_active Ceased
- 2001-06-14 CN CNB018112811A patent/CN1210194C/en not_active Expired - Fee Related
- 2001-06-14 DK DK01951605T patent/DK1294622T3/en active
- 2001-06-14 BR BR0111728-9A patent/BR0111728A/en not_active IP Right Cessation
- 2001-06-14 AT AT01951605T patent/ATE263722T1/en not_active IP Right Cessation
- 2001-06-14 ES ES01951605T patent/ES2218430T3/en not_active Expired - Lifetime
- 2001-06-14 TR TR2004/01193T patent/TR200401193T4/en unknown
- 2001-06-14 WO PCT/EP2001/006865 patent/WO2001096209A1/en active IP Right Grant
- 2001-06-14 EP EP01951605A patent/EP1294622B1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0667193A1 (en) * | 1994-02-15 | 1995-08-16 | Toyo Seikan Kaisha Limited | Method of producing seamless cans |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8322183B2 (en) | 2006-05-16 | 2012-12-04 | Alcoa Inc. | Manufacturing process to produce a necked container |
US7954354B2 (en) | 2006-06-26 | 2011-06-07 | Alcoa Inc. | Method of manufacturing containers |
US8555692B2 (en) | 2006-06-26 | 2013-10-15 | Alcoa Inc. | Expanding die and method of shaping containers |
US9327338B2 (en) | 2012-12-20 | 2016-05-03 | Alcoa Inc. | Knockout for use while necking a metal container, die system for necking a metal container and method of necking a metal container |
Also Published As
Publication number | Publication date |
---|---|
BR0111728A (en) | 2003-05-27 |
AU7248801A (en) | 2001-12-24 |
AU769793B2 (en) | 2004-02-05 |
ES2218430T3 (en) | 2004-11-16 |
DE60102697D1 (en) | 2004-05-13 |
DE60102697T2 (en) | 2005-04-07 |
US20040040970A1 (en) | 2004-03-04 |
PT1294622E (en) | 2004-08-31 |
ATE263722T1 (en) | 2004-04-15 |
TR200401193T4 (en) | 2004-07-21 |
CN1436144A (en) | 2003-08-13 |
DK1294622T3 (en) | 2004-07-19 |
WO2001096209A1 (en) | 2001-12-20 |
EP1294622A1 (en) | 2003-03-26 |
CN1210194C (en) | 2005-07-13 |
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