EP1051330B1 - An improved bottom profile for a can - Google Patents
An improved bottom profile for a can Download PDFInfo
- Publication number
- EP1051330B1 EP1051330B1 EP97922935A EP97922935A EP1051330B1 EP 1051330 B1 EP1051330 B1 EP 1051330B1 EP 97922935 A EP97922935 A EP 97922935A EP 97922935 A EP97922935 A EP 97922935A EP 1051330 B1 EP1051330 B1 EP 1051330B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dome
- dimples
- seating
- diameter
- side wall
- 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.)
- Revoked
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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
- 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 thin metal pressure-resistant can comprising a can body having a deep-drawn and wall-ironed cylindrical side wall, such as for instance a beverage can, with an improved bottom profile.
- beverage cans of the type mentioned in the preamble which cans are manufactured in very large numbers, ever more lighter in weight by starting with a thinner basic material.
- a reduction of the material thickness of beverage cans for instance from a thickness of the basic steel material of 0.26 mm to less than 0.22 mm, it appeared that the resistance against an internal a pressure of over 689 KPa (100 psi) in particular of existing bottoms of standard beverage cans are not in all cases sufficient, causing the occurrence of unacceptable deformation of the beverage cans.
- Cans having a bottom profile comprising an outwardly convexed bottom integrally with said body are known from The Canmaker, November 1996, pp.43 - 44, "Light years ahead", and European Patent Application EP-A-040014.
- a bottom profile according to said article comprises a flat bottom, which has at its centre an inward flat projection.
- US 5421480 discloses, as an alternative to inwardly domed can bottoms, a can bottom comprising a flat central panel connected to a curved wall portion via a substantially flat wall panel.
- FR 2398669 discloses a food can having a substantially flat bottom connected via a series of concave and convex portions to a curved wall.
- FR 2248981 describes a can having a bottom comprising a central dome connected by horizontal and/or flat sloping sections to the side wall.
- An object of the present invention is to provide a can with an alternative bottom and bottom profile, which has a higher resistance so as to allow thinner basic materials to be used.
- the invention consists of a thin metal pressure-resistant can comprising a can body having a deep-drawn and wall-ironed cylindrical side wall and an integral bottom comprising a centered inwardly projecting dome, characterized in that the side wall and the dome are connected by a continuously curved convex bottom portion.
- the bottom of the beverage can is more resistant against internal pressure and meets the requirements set out above using thinner materials.
- the dome which is relatively small compared to the diameter of the can, can expand into convex shape as an indication of an unexpectedly pressure increase in a closed beverage can.
- a thin-walled can with an outwardly convex bottom integrally with said body has the required, pressure resistance and is easy to manufacture.
- a preferred embodiment of the can in accordance with the invention is characterized in that the dome has a diameter in the range of 18 - 30 mm for a can with a diameter of more than 55mm, and more preferably by the dome has a diameter in the range of 20-25 mm.
- the can has a plurality of seating dimples which allows the can to stand more stable on a flat surface.
- the can in accordance with the invention is from a basic steel material thickness of less than 0.22 mm, and more preferably of less than 0.20 mm. By this it is achieved that the can itself weights 20 grams, while it is able to withstand the required pressure of 689 KPa (100 psi).
- the can according to the invention is made of a packaging steel and typically has a side wall thickness of said body after wall-ironing equal to or less than 0.10 mm, even equal to or less than 0.06 mm.
- the seating dimples extend below the lowest part of the convex bottom and the setting area is offset within practical limits towards the periphery consistent with the requirements of adequate strength.
- the number of seating dimples can be chosen freely.
- the height of the seating dimples relative to the convex bottom depends significantly on the requirement whether the can should be stackable or not. When it is not required that the can is stackable with other cans of a similar type, the height of the seating dimples can be kept as low as possible, preferably in the range of up to 4 mm. This allows for a stable positioning of the can on a flat surface. Relatively short seating dimples are easy to produce in the convex shaped bottom of a can.
- the seating dimples can be attached to the bottom of the can in various manners, such as welding or adhesion. In a preferred embodiment the dimples are integrally with said can body.
- the height of the seating dimples should be in a range of 4 to 6 mm when using a standard stay-on-tab lid. Modifications of such a standard lid might lead to a reduction of the height of the seating dimples, which is preferred in respect to the ease of manufacture.
- Fig. 1 shows a part of the bottom of an axi-symmetrical can comprising a standing rim (1) and a hollow part towards the inside, also called dome (2).
- Fig. 2 shows a part of the bottom of the can in accordance with the invention comprising an outwardly convexed bottom and a small inwardly projecting dome at the centre of the bottom, which dome can flop out as an indication of an unexpectedly pressure increase in a closed beverage can.
- the dimensions of the dome are set so that the dome will deform significantly at a pressure of 7 bar or more.
- Fig. 3 shows a part of the bottom of the can in accordance with the invention which also includes a plurality of seating dimples. These seating dimples allow the can to stand more stable on a flat surface.
- Fig 4A shows a part of an axi-symmetrical can body with an outwardly convexed bottom with the dome in accordance with the invention.
- Fig. 4B shows a part of a can body as shown in Fig. 4A, but also including seating dimples which allow the can for a stable positioning on a flat surface.
- Fig. 4C shows a part of a can body as shown in Fig. 4B, but with higher seating dimples, which makes the can stackahle to a can with for example an at least partly outwardly projecting stay-on-tab lid.
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Prostheses (AREA)
- Electron Beam Exposure (AREA)
- Installation Of Indoor Wiring (AREA)
- Image Analysis (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
Abstract
Description
Claims (4)
- A thin metal pressure-resistant can comprising a can body having a deep-drawn and wall-ironed cylindrical side wall and an integral bottom comprising a centered inwardly projecting dome, characterized in that the side wall and the dome are connected by an continuously curved convex bottom portion.
- The can according to claim 1, characterized in that the bottom portion is provided with or is interrupted by a plurality of outwardly projecting seating dimples.
- The can according to claim 1 or claim 2 characterized in that the can is made of packaging steel and has a diameter of more than 55 mm and wherein the dome has a diameter in the range of 18 - 30 mm.
- The can according to claim 3, characterized in that the dome has a diameter in the range of 20 - 25 mm.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP1997/002241 WO1998049065A1 (en) | 1997-04-29 | 1997-04-29 | An improved bottom profile for a can |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1051330A1 EP1051330A1 (en) | 2000-11-15 |
EP1051330B1 true EP1051330B1 (en) | 2003-02-19 |
Family
ID=8166614
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97922935A Revoked EP1051330B1 (en) | 1997-04-29 | 1997-04-29 | An improved bottom profile for a can |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1051330B1 (en) |
AT (1) | ATE232813T1 (en) |
AU (1) | AU2889997A (en) |
BR (1) | BR9714701A (en) |
DE (1) | DE69719228T2 (en) |
DK (1) | DK1051330T3 (en) |
ES (1) | ES2192270T3 (en) |
WO (1) | WO1998049065A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014143121A1 (en) * | 2013-03-15 | 2014-09-18 | Silgan Containers Llc | Container with concentric segmented can bottom |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10037860A1 (en) * | 2000-08-01 | 2002-02-14 | Linhardt Gmbh & Co Kg | Cigar sleeve made of aluminum and method and pressing tool for producing such a sleeve |
US8993021B2 (en) * | 2009-09-02 | 2015-03-31 | Kirin Beer Kabushiki Kaisha | Can bottles in a bottomed, cylindrical configuration, and can products filled up therein with a soft or hard drink |
JP5256150B2 (en) * | 2009-09-02 | 2013-08-07 | 麒麟麦酒株式会社 | Can body body with bottomed cylindrical body and beverage can product filled with beverage |
JP5256155B2 (en) * | 2009-09-24 | 2013-08-07 | 麒麟麦酒株式会社 | Can body body with bottomed cylindrical body and beverage can product filled with beverage |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE7406029L (en) * | 1973-10-25 | 1975-04-28 | American Can Co | |
DE2701827A1 (en) * | 1977-01-18 | 1978-07-20 | Schmalbach Lubeca | CAN FOR PACKAGING GOODS UNDER PRESSURE |
GB1600006A (en) * | 1977-03-26 | 1981-10-14 | Metal Box Co Ltd | Containers |
FR2398669A1 (en) * | 1977-07-29 | 1979-02-23 | Carnaud Sa | Preserved food container with pressed bottom - has support ring of defined curvature and height pressed in bottom to provide container base |
US4732292A (en) * | 1978-06-16 | 1988-03-22 | Schmalbach-Lubeca Gmbh | Flexible bottom profile for drawn and ironed beverage can |
US5421480A (en) * | 1993-04-08 | 1995-06-06 | Reynolds Metals Company | Thin-walled can having a displaceable bottom |
FR2738001B1 (en) * | 1995-08-24 | 1997-09-19 | Lorraine Laminage | GENERAL CIRCULAR FOOD METAL BOX |
-
1997
- 1997-04-29 BR BR9714701-0A patent/BR9714701A/en active Search and Examination
- 1997-04-29 DE DE69719228T patent/DE69719228T2/en not_active Expired - Fee Related
- 1997-04-29 AU AU28899/97A patent/AU2889997A/en not_active Abandoned
- 1997-04-29 EP EP97922935A patent/EP1051330B1/en not_active Revoked
- 1997-04-29 WO PCT/EP1997/002241 patent/WO1998049065A1/en not_active Application Discontinuation
- 1997-04-29 AT AT97922935T patent/ATE232813T1/en not_active IP Right Cessation
- 1997-04-29 ES ES97922935T patent/ES2192270T3/en not_active Expired - Lifetime
- 1997-04-29 DK DK97922935T patent/DK1051330T3/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014143121A1 (en) * | 2013-03-15 | 2014-09-18 | Silgan Containers Llc | Container with concentric segmented can bottom |
Also Published As
Publication number | Publication date |
---|---|
ATE232813T1 (en) | 2003-03-15 |
DE69719228D1 (en) | 2003-03-27 |
DE69719228T2 (en) | 2003-11-20 |
BR9714701A (en) | 2000-06-13 |
ES2192270T3 (en) | 2003-10-01 |
EP1051330A1 (en) | 2000-11-15 |
WO1998049065A1 (en) | 1998-11-05 |
AU2889997A (en) | 1998-11-24 |
DK1051330T3 (en) | 2003-06-16 |
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