WO2006124530A1 - Fond de recipient - Google Patents

Fond de recipient

Info

Publication number
WO2006124530A1
WO2006124530A1 PCT/US2006/018291 US2006018291W WO2006124530A1 WO 2006124530 A1 WO2006124530 A1 WO 2006124530A1 US 2006018291 W US2006018291 W US 2006018291W WO 2006124530 A1 WO2006124530 A1 WO 2006124530A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
leg portion
generally
central axis
nose
Prior art date
Application number
PCT/US2006/018291
Other languages
English (en)
Other versions
WO2006124530B1 (fr
Inventor
Mahesh Rajagopalan
Charles E. Brossia
Carl J. Szwargulski
Michael Jansma
Original Assignee
Metal Container Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metal Container Corporation filed Critical Metal Container Corporation
Priority to US11/919,050 priority Critical patent/US20090272750A1/en
Publication of WO2006124530A1 publication Critical patent/WO2006124530A1/fr
Publication of WO2006124530B1 publication Critical patent/WO2006124530B1/fr

Links

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
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
    • B65D1/0261—Bottom construction
    • B65D1/0276—Bottom construction having a continuous contact surface, e.g. Champagne-type bottom

Definitions

  • the invention relates generally to the design and manufacture of drawn and ironed beverage containers (cans), and in particular to an improved design for the can bottom structure and the method of manufacturing the improved can design.
  • Two-piece aluminum containers are used extensively for packaging beverages such as beer, carbonated soft drinks, and tea.
  • the two-piece containers are comprised of a can body, which is typically made from lightweight materials, such as aluminum or aluminum alloys, and a can lid, which forms the top of the container. After the beverage has been introduced into the internal cavity formed by the can body, the can lid is placed on the open end at the top of the can body, and the can body and can lid are joined together to form a sealed container for the beverage contained therein.
  • the can body is manufactured by a method called drawing and ironing.
  • drawing and ironing The process begins with a plurality of generally circular pieces or blanks being punched from a flat sheet of material, which is typically packaged in large rolls. Each blank is then drawn to produce relatively shallow cup-shaped pieces.
  • the cup is placed over a punch and forced through a set of dies to stretch and thin the sidewalls until the cup is of approximately the desired can height. After the sidewalls have been drawn, the bottom portion of the can is still flat, unworked and of about the same thickness as the original sheet metal.
  • the bottom profile of a can body is typically formed as the last step, in a pressing process that draws material to the required shape and dimensions.
  • the most common bottom profile for a can is a dome bottom, wherein a large portion of the can bottom is formed into a spherical inwardly concave dome, with a convex annular portion, or foot, formed around the outer diameter of the can bottom on which the can stands when it is upright on a horizontal surface. This configuration has been found to resist deformation of the can bottom under internal pressure, and provide sufficient strength to hold the formed can and its contents in an upright position, and resist ruptures and bulging.
  • the can bottom dome is formed when a punch, sometimes referred to as punch nose tooling, which is positioned in the interior of the can body is forced against an end-forming die (sometimes called a dome plug) located on the outside of the can body, to form the generally upwardly extending dome configuration that becomes the bottom of the can.
  • punch nose tooling which is positioned in the interior of the can body is forced against an end-forming die (sometimes called a dome plug) located on the outside of the can body, to form the generally upwardly extending dome configuration that becomes the bottom of the can.
  • end-forming die sometimes called a dome plug
  • One known method of improving the strength of a can bottom profile is to reform either the outside or inside area around the nose. After the can body has been formed, the open top of the can is trimmed to provide a smooth continuous flat top edge to ensure a continuous seal with the can lid.
  • the need for a strong can bottom has required substantial thickness be retained in the bottom to achieve required performance. If the can bottom is not sufficiently strong, the central dome area may reverse shape, becoming convex if the filled can is subject to high pressure.
  • the resistance of a can bottom to reversing is one criteria which is used to measure the strength of a particular can bottom profile. This pressure is referred to as the "dome reversal pressure" or DRP. Design changes that increase the dome reversal pressure make the can more robust in higher pressure situations, such as in pasteurizing equipment.
  • Another criteria for measuring the strength of a particular bottom profile is drop resistance, which is the capability of a container bottom to resist a downward bulge when dropped from a height.
  • the pressure at which the can dome reverses or can bottom otherwise bulges or fails in response to dropping may be dependent upon can bottom design, gauge thickness, and the internal pressure of the can, which in turn is directly related to a variety of factors, such as the formula of the beverage in the can, carbonation of the beverage in the can, and ambient temperature conditions.
  • One advantage of the present invention is that it increases the drop resistance of the can to downward bulges, which are considered unacceptable failures of the cans. Additionally, this particular design has been found to work very well when it is subsequently reformed. Other advantages of the present disclosure will become apparent from the following descriptions, taken in connection with the accompanying drawings, wherein, by way of illustration and example, embodiments of the present invention are disclosed. [012] While there are a variety of cans having domed central panels, the embodiment of the present invention is an improvement over the cans of the prior art for one or more reasons, as explained below.
  • U.S. Patent No. 3,693,828 to Rneusel et al. discloses a unibody can having a domed central panel.
  • the can of Kneusel only provides for a single section in the outer leg between the nose and can sidewall.
  • U.S. Patent 4,685,582 to Pulciani discloses a unibody can bottom having a domed central panel and a single section in the outer leg separated from the can sidewall by a single, inwardly directed transitional radii.
  • U.S. Patent No. 4,919,294 to Kawamoto et al. discloses a unibody can having a domed central panel that has two arrangements.
  • One arrangement like the arrangement in the Kneusel patent, has only a single straight, outwardly angled outer leg; the other arrangement has an outer leg that has a single section that is inwardly convex in shape.
  • the can of the present invention provides for two leg portions separated by a transitional radii, which provides for greater strength, stability and versatility over the prior art can.
  • a container having a sidewall portion, an open top to which a can lid is sealed after the can has been filled, and a bottom structure of a unique configuration.
  • the bottom structure has a domed central panel.
  • the outer edge of the domed central panel is connected to the upper edge of a substantially cylindrical vertical inner leg portion by a transitional radii.
  • the lower edge of the inner leg portion is connected to the inside edge of a generally semi-circular or semi-toroidal nose portion by an inner bottom nose radius.
  • the outside edge of the nose portion is connected to the lower edge of an upwardly and outwardly inclined outer leg portion by an outer bottom nose radius.
  • the upper edge of the outer leg portion is connected to the lower edge of an outwardly inclined peripheral portion by an inwardly directed transitional radii.
  • the upper edge of the peripheral portion is connected to the lower end of the generally cylindrical vertical sidewall portion that extends axially about the centerline of the container by an outwardly directed transitional radii.
  • FIG. 1 is a cross-sectional side view of a standard beverage can in which the preferred embodiment may be used.
  • FIG. 2 is an enlarged cross-sectional side view of the bottom of the container, showing the details of a preferred embodiment of the present invention.
  • Container and “can” are used interchangeably.
  • Container stand plane means an imaginary horizontal plane perpendicular to a longitudinal central axis of the container, and upon which the container bottom would rest when placed in an upright position on a horizontal surface.
  • downwardly means a direction towards the container stand plane
  • upwardly means a direction away from the container stand plane, unless otherwise noted.
  • outwardly means a direction away from the longitudinal central axis of the container
  • inwardly means a direction towards the longitudinal central axis of the container, unless otherwise noted.
  • FIG. 1 is a cross-sectional side view of a typical container 10.
  • Container 10 has a mouth or open portion 20 at its uppermost end. Mouth portion 20 is integrally connected to generally circumferential or generally cylindrical sidewall portion 40. Sidewall portion 40 is connected at its lowermost end to bottom structure 100, thus forming an open-ended vessel.
  • Container 10 has a longitudinal central axis 60, perpendicular to a container stand plane 80. The design of bottom structure 100 is further detailed in FIG. 2.
  • FIG. 2 is an enlarged cross-sectional side view of bottom structure 100 of container 10 in FIG 1. As can be seen in this view, a central panel 110 forms the center of bottom structure 100.
  • the central panel 110 is formed of a plurality of generally concentric domes (which are referred to as bi-radial or multi-radial domes). As depicted, the central panel 110 has two domes.
  • the first, innermost dome has a first, or major, radius of curvature R 1 that is approximately 1.75 inches at a point that is approximately 0.630 inches from central axis 60.
  • the outermost dome has a second, or minor, radius of curvature R 2 that is approximately 0.55 inches at a point that is approximately 0.848 inches from central axis 60.
  • the top of the central panel 110 has a height H 1 .
  • H 1 is preferably from about 0.42 to about 0.48 inches above the container stand plane 80, but most preferably, H 1 is about 0.453 inches.
  • Prior art cans typically have a domed central panel that has a height above the stand plane of about 0.425 inches.
  • the outer edge of the central panel 110 is connected to the upper edge of an inner leg portion 130 by a transitional inner radius 120.
  • transitional inner radius 120 is from about 0.05 to about 0.120 inches.
  • the inner leg portion 130 extends generally axially downwardly from the central panel 110, and is inclined inwardly toward longitudinal central axis 60 of container 10 at angle ⁇ . Angle ⁇ is typically less than 3°, and preferably about 2°30'.
  • inner leg portion 130 is connected to generally semi- toroidal nose portion 140 by an inner bottom nose radius 136.
  • the preferred value of inner bottom nose radius 136 is about 0.0598 inches.
  • Prior art cans have an inner bottom nose radius of about 0.025 inches.
  • the lowest point of the nose 140 is generally tangential to container stand plane 80. Nose portion 140 forms a "ring” or a portion of a "ring” upon which container 10 may rest upright on the container stand plane 80, or other horizontal surfaces.
  • the nose diameter, or rim stand diameter, D 1 of a can of the present invention (the distance from the center of the nose portion 140 on one side of the can to the center of the nose portion directly across the can) is preferably 1.850 inches, ⁇ .010 inches.
  • This nose radius 136 which is larger than prior art cans, provides better stability, such that when the cans are being moved along a conveyor and conveyor transfer plates, there are fewer tipped-over cans that can cause conveyor jams, especially when the cans are empty. Fewer tipped over cans mean increased production efficiency.
  • the nose radius 136 is still of a size that the beverage container can be stacked on top of another beverage container and to rest on the lid of the lower container.
  • the outside edge of nose portion 140 is connected to the lower edge of an upwardly and outwardly inclined frustoconical outer leg portion 160 by an inwardly directed outer bottom nose radius 150.
  • the preferred value of outer bottom nose radius 150 is about 0.0745 inches.
  • the outer leg portion 160 extends generally axially upward, and is inclined outward at angle ⁇ . Although not critical, angle ⁇ is between about 27° and about 33°, and preferably about 29°40'.
  • the upper edge of the outer leg portion 160 is connected to the lower edge of an outwardly and upwardly inclined frustoconical peripheral portion 180 by an inwardly directed transitional outer leg radius 170. The preferred value of transitional outer leg radius 170 is about 0.080 inches.
  • the inclined peripheral portion 180 extends generally axially upward, and is inclined outward at angle ⁇ . Preferably, angle ⁇ is between about 25° and about 33°, and preferably about 29°20'.
  • the upper edge of the inclined peripheral portion 180 connected to the lower end of the generally cylindrical sidewall portion 40, extends axially about the centerline of the container by an outwardly directed transitional radius 190.
  • the preferred value of transitional outer radius 190 is about 0.1608 inches.
  • a line drawn between the bottom of the nose portion 140 and the bottom of the outwardly directed transitional radius 190 forms an angle ⁇ upward from the stand plane 80.
  • angle ⁇ is between about 35° and about 45°, and preferably about 40°31 '.
  • the products must be able to perform in use. For example, they must hold beverages without leaking, reversing, bulging, or experiencing other failures, while maintaining the food or beverage within in a consumable state that is satisfactory to the ultimate consumer.
  • the cans must also be able to withstand the pressure applied to the inside of the can by the carbonated beverage contained therein.
  • the can design must function to enable stacking of cans of similar construction in more than one layer, while maintaining a stability of the stacked structure. Therefore, the can bottom must sit stably on, or nest in, a can lid attached to the top of a can below it in the stack. This can be achieved by having two or more points of contact between the can bottom and adjacent can lid and/or can neck.
  • the performance of a can will vary, even in a specific type of can, depending on a variety of factors, such as the formula of the beverage in the can, carbonation of the beverage in the can, and ambient temperature conditions.
  • Two similarly filled cans in different environments could bulge or reverse at different pressures.
  • the beverage exerts more pressure against the inside of the can than a similar can of beverage at a lower temperature.
  • carbonated beverages in a can apply more outward pressure against the can than non- or low-carbonated beverages.
  • the drop and reversal resistance of the can bottom is related in part to the internal pressure of the can.
  • the outside, or atmospheric pressure can also impact the pressure at which the dome reverses or can bulges.
  • testing is performed on cans to ensure they meet various requirements for use. There are a variety of tests used to determine the qualities of cans. In addition to meeting certain specified standards, it is desirable to anticipate how cans will perform in the consumer environment (i.e. stores, homes, etc.). As previously stated, it should be appreciated that test results can vary based on location and other atmospheric factors.
  • One standard test for can bottoms is the "buckle test” which determines the pressure, in pounds per square inch (psi), applied to the inside bottom of a can before the can bottom buckles from the pressure.
  • Another standard test is the drop resistance test, in which a filled, pressurized can is dropped from sequentially higher distances to a flat surface until a partial reversal (downward bulge) of the can bottom is achieved. The can is then dropped from greater heights until the bottom dome experiences a full reversal such that it is lower than the nose portion 140, so that the can "rocks" when placed on a flat surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Stackable Containers (AREA)

Abstract

Pendant des années, les fonds de canettes ont été formés en vue d'apporter une intégrité structurelle aux canettes, lesquelles comprennent différentes configurations. La présente invention décrit un nouveau profil pour un fond de récipient. La structure de fond comprend un panneau central multiradial en dôme partant du bord extérieur de la structure vers une patte intérieure sensiblement cylindrique faisant saillie vers le bas. La patte intérieure s'étend sensiblement vers un nez semi-toroïdal. L'extérieur du nez s'étend vers une patte extérieure inclinée vers le haut et vers l'extérieur. La patte extérieure est reliée à une partie périphérique inclinée vers l'extérieur. La partie périphérique est reliée à l'extrémité inférieure de la paroi latérale sensiblement cylindrique.
PCT/US2006/018291 2005-05-12 2006-05-11 Fond de recipient WO2006124530A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/919,050 US20090272750A1 (en) 2005-05-12 2006-05-11 Container bottom

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US68078205P 2005-05-12 2005-05-12
US60/680,782 2005-05-12

Publications (2)

Publication Number Publication Date
WO2006124530A1 true WO2006124530A1 (fr) 2006-11-23
WO2006124530B1 WO2006124530B1 (fr) 2007-02-15

Family

ID=37431556

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/018291 WO2006124530A1 (fr) 2005-05-12 2006-05-11 Fond de recipient

Country Status (2)

Country Link
US (1) US20090272750A1 (fr)
WO (1) WO2006124530A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021058998A1 (fr) * 2019-09-23 2021-04-01 Can-Pack Spolka Akcyjna Canette en métal

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD744861S1 (en) 2013-03-14 2015-12-08 Crown Packaging Technology, Inc. Aerosol can
EP3026424A1 (fr) * 2014-11-27 2016-06-01 Hach Lange GmbH Turbidimètre néphélométrique utilisant une cuvette avec étiquette

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002082A1 (fr) * 1977-11-10 1979-05-30 SOLVAY & Cie (Société Anonyme) Corps creux en matière thermoplastique orientée
JPS5648946A (en) * 1979-09-26 1981-05-02 Kishimoto Akira Pressure resisting plastic vessel* shock resistance thereof is improved
US6293421B1 (en) * 1990-04-06 2001-09-25 Ball Corporation Beverage container with increased bottom strength

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7472800B2 (en) * 2004-03-05 2009-01-06 Rexam Beverage Can Company Bottom profile for drawn and ironed can body

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002082A1 (fr) * 1977-11-10 1979-05-30 SOLVAY & Cie (Société Anonyme) Corps creux en matière thermoplastique orientée
JPS5648946A (en) * 1979-09-26 1981-05-02 Kishimoto Akira Pressure resisting plastic vessel* shock resistance thereof is improved
US6293421B1 (en) * 1990-04-06 2001-09-25 Ball Corporation Beverage container with increased bottom strength

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021058998A1 (fr) * 2019-09-23 2021-04-01 Can-Pack Spolka Akcyjna Canette en métal

Also Published As

Publication number Publication date
US20090272750A1 (en) 2009-11-05
WO2006124530B1 (fr) 2007-02-15

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