GB2250972A - Can bodies - Google Patents

Can bodies Download PDF

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Publication number
GB2250972A
GB2250972A GB9027851A GB9027851A GB2250972A GB 2250972 A GB2250972 A GB 2250972A GB 9027851 A GB9027851 A GB 9027851A GB 9027851 A GB9027851 A GB 9027851A GB 2250972 A GB2250972 A GB 2250972A
Authority
GB
United Kingdom
Prior art keywords
central portion
metal
wall
wall thickness
panels
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.)
Granted
Application number
GB9027851A
Other versions
GB2250972B (en
GB9027851D0 (en
Inventor
Paul Charles Claydon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crown Packaging UK Ltd
Original Assignee
CMB Foodcan PLC
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10687472&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB2250972(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by CMB Foodcan PLC filed Critical CMB Foodcan PLC
Priority to GB9027851A priority Critical patent/GB2250972B/en
Publication of GB9027851D0 publication Critical patent/GB9027851D0/en
Priority to ZA919369A priority patent/ZA919369B/en
Priority to MYPI91001883A priority patent/MY107646A/en
Priority to KR1019910022079A priority patent/KR0141910B1/en
Priority to AU88393/91A priority patent/AU655440B2/en
Priority to EP91311334A priority patent/EP0492861B1/en
Priority to NZ240877A priority patent/NZ240877A/en
Priority to DE69103254T priority patent/DE69103254T2/en
Priority to ES91311334T priority patent/ES2059064T3/en
Priority to AT91311334T priority patent/ATE109419T1/en
Priority to DK91311334.6T priority patent/DK0492861T3/en
Priority to CA002057755A priority patent/CA2057755C/en
Priority to JP3333583A priority patent/JPH04311445A/en
Priority to MX9102668A priority patent/MX9102668A/en
Priority to PL91292871A priority patent/PL166562B1/en
Priority to BR919105559A priority patent/BR9105559A/en
Publication of GB2250972A publication Critical patent/GB2250972A/en
Priority to US07/993,972 priority patent/US5261558A/en
Publication of GB2250972B publication Critical patent/GB2250972B/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • 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
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Medicinal Preparation (AREA)
  • Materials For Medical Uses (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Table Devices Or Equipment (AREA)
  • Basic Packing Technique (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Non-Alcoholic Beverages (AREA)
  • Stackable Containers (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Tea And Coffee (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

A metal can body for a beverage can comprises a bottom end wall 2 and a generally cylindrical side wall 3; the side wall comprising a bottom portion 4 connected to the bottom wall, a central portion 5 extending upwardly from the bottom portion, and a top portion 6 extending upwardly from the central portion and terminating in an open end. The top portion 6 and bottom portion 4 are of greater wall thickness than the central portion 5 and are respectively connected to the central portion through upper and lower annular zones 7, 8 of reducing wall thickness. The side wall is provided with a plurality of parallel externally convex longitudinal ribs 10 equally spaced around the circumference and terminating within the zones 7, 8 of reducing wall thickness. <IMAGE>

Description

- 1 9 2-SC)? 72 CAN BODIES The invention relates to metal can bodies for
beverage cans. Such can bodies are adapted to be closed by a can end seamed to the open end of the can body to form a closed can.
Known can bodies for beverage cans comprise a bottom end wall, a generally cylindrical side wall, the side wall comprising a bottom portion connected to the bottom wall, a central portion extending upwardly from the bottom portion, and a top portion extending upwardly from the central portion and terminating in an open end; wherein the top portion and bottom portion are of greater wall thickness than the central portion and are respectively connected to the central portion through upper and lower annular zones of reducing wall thickness.
During handling of can bodies small dents may be made in the cylindrical wall and these dents provide localised points of weakness which can lead to creasing during necking and flanging of the neck of the can body, and filling double seaming of the can end onto the can body during which the can body is subjected to an axial load. It has been found that the provision of a plurality of parallel longitudinally extending outwardly convex ribs in the central portion of the can body will reduce or eliminate the effect of such dents and give axial strength to the can. It has also been found that the optimum performance of the can body is achieved when the ribs terminate in the zones of reducing wall thickness and thus connect the portions of greater wall thickness together.
Accordingly the invention provides a metal can body for a beverage can comprising a bottom end wall, a generally cylindrical side wall, the side wall comprising a bottom portion connected to the bottom wall, a central portion extending upwardly from the bottom portion, and a top portion extending upwardly from the central portion and terminating in an open end; wherein the top portion and bottom portion are of greater wall thickness than the central portion and are respectively connected to the central portion through upper and lower annular zones of reducing wall thickness; and wherein the side wall is provided with a plurality of parallel externally convex longitudinal ribs equally spaced around the circumference and terminating within the zones of reducing wall thickness.
Embodiments of the invention are described below with reference to the accompanying drawings in which:Figure 1 shows a partial section of a can body prior to provision of the longitudinal ribs; 3 - Figure 2 shows a partial section of a can body after provision of the longitudinal ribs; Figure 3 shows a side view of a can body, partially in section after provisio-n of the ribs and after necking and flanging; Figure 4 is a graph representing the wall thickness of the can body of Figure 3 against height; Figure 5 is a side view of a can body; Figure 6 is a horizontal section of the can body of Figure 5 taken on lines VI-VI; Figures 7 and 8 are similar views to those of Figures 5 and 6 of an alternative embodiment of can body; Figure 9 is a radial cross section through a mandrel for forming ribs in a can body; and Figure 10 is an axial section through a mandrel for forming a can body.
Referring to Figures 1-4 it will be seen that the can body 1 comprises a bottom end wall 2, which in this case is domed, and a side wall 3. The side wall 3 comprises a bottom portion 4 connected to the bottom end wall, a central portion 5 and a top portion 6 terminating in an open end. The top portion 6 and bottom portion 4 are of greater wall thickness than the central portion 5 and are respectively connected to the central portion 5 through upper and lower annular zones 7,8 which have a wall thickness which reduces towards the central portion 5. Typically the wall thickness of the top portion will be about 0.15mm (.0060 inches), central portion about O.lmm (.0040 inches), and bottom portion about 0.3mm. (.0120 inches). The can body of Figure 1 is formed by blanking a disc from sheet metal, drawing a cup from the disc to form a bottom end wall and a side wall, and wall ironing the side wall. Figure 2 shows the can body after the provision of a plurality of parallel longitudinally extending convex ribs 10 equally spaced around the circumference. The ribs 10 terminate in the zones 7, 8. Adjacent ribs define elongate panels 11 therebeteween. Each panel 11 has semi-elliptical shaped end areas formed within the zones 7,8. The ribs and panels extend into the zones 7,8 to optimize the can body performance by providing strengthening columns connecting the upper and lower portions 4, 6 of relatively great wall thickness.
Figure 3 shows the can body after necking and flanging of the top portion 6 in readiness for receiving a can end to be seamed to the flange 12 in known manner.
Figure 4 shows the thickness profile of the side wall as it varies through the height of the can body.
Figures 1-4 show a can body provided with only 24 ribs 10 and panels 11. It is believed that can bodies having from about 24 to about 45 ribs are useful for beverage cans. If the number of ribs is less than about 24 there is a significant reduction in the volume of the finished can.
Figures 5 and 6 show a can body having 30 ribs 10 and panels 11. Each rib is outwardly convex having a radius P and lies on a circle of radius R where R is radius of the can body in the middle of the central portion prior to formation of the ribs. The panels 11 are outwardly concave and have a radius U. The concavity of the panels 11 has been exaggerated in Figures 5 and 6. The ratio of U:P is preferably at least 20:1. Typically the rib radius P will be about lmm. The perimeter of the can body in the central portion after forming of the ribs is the same as it was beforehand and the radii R, P and U are related by the equation R=U+2P. In this manner, stretching of the can wall during form of the ribs is avoided.
In a further embodiment shown also in Figures 7 and 8, also having 30 ribs 10, the panels are substantially flat. In this case the ribs 10 will lie on a circle whose radius is very slightly greater than the radius R prior to formation of the ribs and panels. As a result of the wall ironing process for forming the can body, however, the top and bottom portions 6 and 4 have a 6 - slightly greater radius than the central portion and the radius of the central portion of the can body after formation of the ribs will be no greater than the radius of the top and bottom portions. This is important in handling since the can body must roll truly.
Figures 9 and 10 show a mandrel 20 used in formation of the ribs and panels. The can body is located over the mandrel which is then rolled along an external forming rail (not shown). The ribs are formed prior to necking of the can body but nevertheless the mandrel must be of smaller radius than the can body so that it can be extracted from the can body. To this end it is formed with less ribs than the can body. In the example shown the mandrel 20 has 29 ribs 21 for forming a can body with 30 ribs. Between the ribs 21 on the mandrel are panels 22 which are outwardly concave. The profiles of the panels 22 will determine the profiles of the panels 11 in the can body. The mandrel shown in Figs. 9 and 10 is for forming the can body of Figs. 7 and 8 having substantially flat panels 11. During formation, the side wall of the central portion of the can body is locally deformed to the profile of the mandrel 20 but due to the natural resilience of the material the panels of the can body will subsequently spring back to a substantially flat profile. If a can body as shown in Figs. 5 and 6 is required, the panels 22 - 7 of the mandrel 20 are formed more deeply concave. The depth of the panel must, however, be relatively shallow to avoid excessive loss of volume and to prevent the panels from reversing when subjected to internal pressure as would be experienced when the can is filled with a carbonated drink.
The improved performance of can bodies as a result of the panelling may be used to increase the axial load strength, or to allow a reduction of the wall thickness of the central portion 5 without loss of axial strength. Comparative tests have shown that the performance of panelled can bodies having a wall thickness in the central portion of 4 0x10-4 inches is comparable to that of unpanelled can bodies of wall thickness 43xl 0-4 inches. Considering the large number of can bodies made, this represents a very significant saving.

Claims (7)

  1. CLAIMS:
    A metal can body for a beverage can comprising a bottom end wall, a generally cylindrical side wall, the side wall comprising a bottom portion connected to the bottom wall, a central portion extending upwardly from the bottom portion, and a top portion extending upwardly from the central portion and terminating in an open end; wherein the top portion and bottom portion are of greater wall thickness than the central portion and are respectively connected to the central portion through upper and lower annular zones of reducing wall thickness; and wherein the side wall is provided with a plurality of parallel externally convex longitudinal ribs equally spaced around the circumference and terminating within the zones of reducing wall thickness.
  2. 2. A metal can body as claimed in claim 1 wherein adjacent ribs define elongate panels therebetween, each panel having semi-elliptical shaped end areas formed within the zones of reducing wall thickness.
  3. 3. A metal can body as claimed in claim 2 wherein the panels are outwardly concave.
  4. 4. A metal can body as claimed in claim 2 wherein the panels are substantially flat.
    9
  5. 5. A metal can body as claimed in any preceding claim wherein the number of panels is from 24 to 45.
  6. 6. A metal can body as claimed-in claim 5 wherein the number of panel is about 30.
  7. 7. A metal can body substantially as d - escribed herein with reference to the accompanying drawings.
GB9027851A 1990-12-21 1990-12-21 Can bodies Expired - Fee Related GB2250972B (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
GB9027851A GB2250972B (en) 1990-12-21 1990-12-21 Can bodies
ZA919369A ZA919369B (en) 1990-12-21 1991-11-27 Can bodies.
MYPI91001883A MY107646A (en) 1990-12-21 1991-11-28 Can bodies
KR1019910022079A KR0141910B1 (en) 1990-12-21 1991-12-03 Can bodies
AU88393/91A AU655440B2 (en) 1990-12-21 1991-12-04 Can bodies
NZ240877A NZ240877A (en) 1990-12-21 1991-12-05 Can body with ribbed sidewalls
AT91311334T ATE109419T1 (en) 1990-12-21 1991-12-05 CAN BODY.
DK91311334.6T DK0492861T3 (en) 1990-12-21 1991-12-05 canned bodies
DE69103254T DE69103254T2 (en) 1990-12-21 1991-12-05 Can body.
ES91311334T ES2059064T3 (en) 1990-12-21 1991-12-05 BOAT BODIES.
EP91311334A EP0492861B1 (en) 1990-12-21 1991-12-05 Can bodies
CA002057755A CA2057755C (en) 1990-12-21 1991-12-16 Can bodies
JP3333583A JPH04311445A (en) 1990-12-21 1991-12-17 Can body
MX9102668A MX9102668A (en) 1990-12-21 1991-12-18 IMPROVED PACKAGING FOR BARROBLOCK.
PL91292871A PL166562B1 (en) 1990-12-21 1991-12-19 Can in particular for beverages
BR919105559A BR9105559A (en) 1990-12-21 1991-12-20 TIN BODY
US07/993,972 US5261558A (en) 1990-12-21 1992-12-17 Can bodies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9027851A GB2250972B (en) 1990-12-21 1990-12-21 Can bodies

Publications (3)

Publication Number Publication Date
GB9027851D0 GB9027851D0 (en) 1991-02-13
GB2250972A true GB2250972A (en) 1992-06-24
GB2250972B GB2250972B (en) 1994-05-04

Family

ID=10687472

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9027851A Expired - Fee Related GB2250972B (en) 1990-12-21 1990-12-21 Can bodies

Country Status (16)

Country Link
EP (1) EP0492861B1 (en)
JP (1) JPH04311445A (en)
KR (1) KR0141910B1 (en)
AT (1) ATE109419T1 (en)
AU (1) AU655440B2 (en)
BR (1) BR9105559A (en)
CA (1) CA2057755C (en)
DE (1) DE69103254T2 (en)
DK (1) DK0492861T3 (en)
ES (1) ES2059064T3 (en)
GB (1) GB2250972B (en)
MX (1) MX9102668A (en)
MY (1) MY107646A (en)
NZ (1) NZ240877A (en)
PL (1) PL166562B1 (en)
ZA (1) ZA919369B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5593056A (en) * 1995-05-08 1997-01-14 Pepsico., Inc. Rib for plastic container
US5699932A (en) * 1993-12-04 1997-12-23 Carnaudmetalbox (Holdings) Usa Inc. Can body having sidewall grooves

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5279442A (en) * 1991-12-18 1994-01-18 Ball Corporation Drawn and ironed container and apparatus and method for forming same
US5727414A (en) * 1995-06-07 1998-03-17 American National Can Company Method for reshaping a container
HUP9700051A3 (en) * 1995-06-07 2000-01-28 Oberburg Engineering Ag Reshaped container and method and apparatus for reshaping a container
US5704244A (en) * 1995-06-07 1998-01-06 American National Can Company Apparatus for reshaping a container
JP3441317B2 (en) * 1996-10-21 2003-09-02 大和製罐株式会社 Method for producing deformed metal can having irregular pattern on body
US7726165B2 (en) 2006-05-16 2010-06-01 Alcoa Inc. Manufacturing process to produce a necked container
US7934410B2 (en) 2006-06-26 2011-05-03 Alcoa Inc. Expanding die and method of shaping containers
PL2605873T3 (en) 2010-08-20 2022-04-11 Kaiser Aluminum Warrick, Llc Shaped metal container and method for making same
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
JP6406033B2 (en) * 2015-01-28 2018-10-17 工機ホールディングス株式会社 Centrifuge and swing rotor for centrifuge
PL426328A1 (en) * 2018-03-20 2019-09-23 Can-Pack Spółka Akcyjna Metal can

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB236059A (en) * 1924-08-05 1925-07-02 Davis Welding & Mfg Company Improvements in cans and like vessels
GB243947A (en) * 1925-02-27 1925-12-10 Arthur Charles Giles Improvements in the production of sheet metal cylinders, drums and like containers and in apparatus used therein
GB703836A (en) * 1948-12-11 1954-02-10 Sava Byron Franghia Improvements in or relating to cartons or containers
US3335902A (en) * 1964-12-28 1967-08-15 Continental Can Co Superimposed axial-circumferential beading of cans
GB1120576A (en) * 1966-07-07 1968-07-17 Plastic Can Corp Improvements in and relating to drawing articles from a blank of ductile metal
US4512490A (en) * 1981-05-12 1985-04-23 Cantec, Inc. Strengthened can bodies of thin-walled metal

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1378442A (en) * 1917-11-16 1921-05-17 Lanston Monotype Machine Co Process of corrugating cylindrical bodies
US4169537A (en) * 1978-03-22 1979-10-02 Centennial Plastics Co., Inc. Storage drum
DE3118783C2 (en) * 1981-05-12 1986-02-20 Cantec, Inc., Fort Worth, Tex. Device for beading the body of a sheet metal container
DE3216660A1 (en) * 1981-05-12 1982-12-16 Cantec, Inc., Fort Worth, Tex. Can made of thin-walled material and method of its manufacture
US4578976A (en) * 1984-04-09 1986-04-01 National Can Corporation Container processing apparatus
GB8923909D0 (en) * 1989-10-24 1989-12-13 Metal Box Plc Containers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB236059A (en) * 1924-08-05 1925-07-02 Davis Welding & Mfg Company Improvements in cans and like vessels
GB243947A (en) * 1925-02-27 1925-12-10 Arthur Charles Giles Improvements in the production of sheet metal cylinders, drums and like containers and in apparatus used therein
GB703836A (en) * 1948-12-11 1954-02-10 Sava Byron Franghia Improvements in or relating to cartons or containers
US3335902A (en) * 1964-12-28 1967-08-15 Continental Can Co Superimposed axial-circumferential beading of cans
GB1120576A (en) * 1966-07-07 1968-07-17 Plastic Can Corp Improvements in and relating to drawing articles from a blank of ductile metal
US4512490A (en) * 1981-05-12 1985-04-23 Cantec, Inc. Strengthened can bodies of thin-walled metal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5699932A (en) * 1993-12-04 1997-12-23 Carnaudmetalbox (Holdings) Usa Inc. Can body having sidewall grooves
US5593056A (en) * 1995-05-08 1997-01-14 Pepsico., Inc. Rib for plastic container

Also Published As

Publication number Publication date
BR9105559A (en) 1992-09-01
KR920011874A (en) 1992-07-25
GB2250972B (en) 1994-05-04
DK0492861T3 (en) 1994-11-07
NZ240877A (en) 1993-07-27
EP0492861B1 (en) 1994-08-03
PL292871A1 (en) 1992-06-26
GB9027851D0 (en) 1991-02-13
DE69103254T2 (en) 1994-11-24
CA2057755C (en) 1996-01-09
PL166562B1 (en) 1995-06-30
JPH04311445A (en) 1992-11-04
AU8839391A (en) 1992-06-25
ATE109419T1 (en) 1994-08-15
ES2059064T3 (en) 1994-11-01
ZA919369B (en) 1993-05-27
MY107646A (en) 1996-05-30
MX9102668A (en) 1992-06-01
DE69103254D1 (en) 1994-09-08
CA2057755A1 (en) 1992-06-22
AU655440B2 (en) 1994-12-22
EP0492861A1 (en) 1992-07-01
KR0141910B1 (en) 1998-07-15

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20001221