WO1998020992A1 - Remodelage de contenants emboutis et etires - Google Patents

Remodelage de contenants emboutis et etires Download PDF

Info

Publication number
WO1998020992A1
WO1998020992A1 PCT/GB1997/003035 GB9703035W WO9820992A1 WO 1998020992 A1 WO1998020992 A1 WO 1998020992A1 GB 9703035 W GB9703035 W GB 9703035W WO 9820992 A1 WO9820992 A1 WO 9820992A1
Authority
WO
WIPO (PCT)
Prior art keywords
neck
mould
flange
container
reshaping
Prior art date
Application number
PCT/GB1997/003035
Other languages
English (en)
Inventor
Christopher Paul Ramsey
Original Assignee
Carnaudmetalbox Plc
Carnaudmetalbox S.A.
Carnaudmetalbox N.V.
Carnaudmetalbox (Holdings) Usa Inc.
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 Carnaudmetalbox Plc, Carnaudmetalbox S.A., Carnaudmetalbox N.V., Carnaudmetalbox (Holdings) Usa Inc. filed Critical Carnaudmetalbox Plc
Priority to AU48750/97A priority Critical patent/AU4875097A/en
Publication of WO1998020992A1 publication Critical patent/WO1998020992A1/fr

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

Definitions

  • This invention relates to the reshaping of drawn and wall ironed (DWI ) containers .
  • DWI drawn and wall ironed
  • This invention relates to the reshaping of necked DWI cans.
  • a DWI beverage can generally comprises three principle parts, namely a base, a thin cylindrical side wall and a neck.
  • the base of the can is not affected by the wall ironing and so is thicker than the rest of the can.
  • the neck is thicker than the side wall but thinner than the base, since the neck region generally undergoes some wall ironing before being formed into a neck by known methods such as die necking, roll necking or spin flow forming.
  • DWI cans The reshaping of DWI cans is described, for example, in UK patent application no. 9604784.0, in which pressurised air is introduced to the interior of the can in order to expand the can side wall outwardly against a profiled mould. The can then takes on the shape of the wall of the mould.
  • the neck of the can is supported in a neck ring, contact between the neck and the neck ring facilitating the application of an axial load during the reshaping process.
  • a method of reshaping a drawn and wall ironed container comprising a base, a thin cylindrical side wall and a neck
  • the method comprising: providing a longitudinally split mould having a mould cavity defining a desired final shape of the container, said shape comprising one or more outwardly extending portions in at least a region corresponding to the neck; placing the container in the mould; closing the mould; supplying pressurised fluid to the interior of the container to expand the container to the shape of the mould; and expanding at least part of the neck.
  • the pressurised fluid is air.
  • the use of a fluid is essential for obtaining access to the interior of the can, particularly in the neck region where it would be difficult to insert expandable articles for reshaping of the neck.
  • the method may comprise expanding the neck into a series of flutes.
  • the neck may be expanded around the whole circumference .
  • the method may further comprise providing a mould wall having at least one inwardly extending portion in the region corresponding to the position of the neck, whereby closing the mould compresses corresponding portions of the neck.
  • the method may further comprise applying a load to the can by a thrust ring which contacts a flange on the can.
  • the method may also comprise reshaping the flange.
  • this reshaping may be achieved by applying an axial load through the flange and transmitting the load through the neck.
  • the neck region of the can is reshaped and the mould wal] contacts the side wall of the can throughout the reshaping process.
  • the side wall remains substantially straight ("vertical" in use) in the reshaped can. This not only reduces or eliminates the risk of side wall splits but also maintains the axial load strength of the can both during and after reshaping.
  • a drawn and wall ironed can comprising a base, a side wall and a neck, in which the neck comprises one or more expanded regions.
  • the neck may also include one or more compressed regions.
  • the neck may usually terminate in a flange.
  • This flange may have a flange angle (the angle between the flange and the horizontal when the can is standing upright) of between 0 and -45° as described in UK patent application no. 9506962.1.
  • This downwardly facing flange enables acceptable double seams to be formed with a much lower axial load than was previously thought possible. Since the axial loading capacity of a reshaped can is lower than that of a simple necked DWI can, clearly any reduction in the load required to form a double seam is advantageous .
  • Figure 1 is a side section of a typical DWI can
  • Figure 2 is a side section of a first embodiment of reshaped can
  • Figure 3 is a side section of a second embodiment of reshaped can;
  • Figure 4 is an enlarged side section of the neck region of the can of figure 3;
  • Figure 5 is a side section of a third embodiment of reshaped can
  • Figure 6 is a side section of the embodiment of figure 5, in which the flange angle has been changed to a downwardly facing angle;
  • Figure 7 is a side section of a mould for making the embodiment of figure 3.
  • Figure 8 is an enlarged side section of a mould for forming a flange as shown in figure 6.
  • Figure 1 shown a typical DWI can 1 which is used as a preform for the reshaping of the present invention.
  • the can comprises a base 3, cylindrical side wall 5, a neck 10 and flange 9.
  • the base 3 is approximately 0.305 mm and is connected to the thin side wall 5 by a lower transition zone 4 of decreasing thickness, the fully wall ironed side wall being typically 0.114 mm.
  • An upper transition zone 6 of gradually increasing thickness and a cylindrical portion 7 of constant thickness connect the side wall to the neck.
  • the neck 10 has a constant thickness of around 0.178 mm and comprises a base 12 having a radius r which decreases according to the diameter of the straight cylindrical part 14 in order to maintain the capacity of the can.
  • the can of figure 1 may be used as a preform for a variety of shapes .
  • Figures 2 and 3 show two alternative shapes which have been produced using the method of the present invention.
  • the original shape of the can preform 1 is shown as a dotted outline.
  • the neck of the can 10 has been reshaped from the straight part 14 to the side wall.
  • the side wall has been formed into a bowed shape and the lower side wall and transition zone have been expanded.
  • the overall shape thus formed is that of a barrel, with the barrel height being less than that of the preform due to the increase in diameter.
  • Figures 3 and 4 demonstrate the possibilities for fluting of the neck region, both by expansion and by compression of one or more flutes where overall deeper fluting is desired. This approach is clearly seen in figure 4.
  • a circumferential ridge 18 has been formed at the base of the fluted region, in the upper side wall. This ridge has an expansion of about 5%, expanding the can from approximately 63mm (209) to 66mm (211) diameter.
  • the dotted line again indicates the shape of the preform can 1, which has a diameter of 66 mm.
  • the fluted region 20 comprises a series of flutes each of which involve compression from the preform shape in an upper region 22 and expansion in a lower region 24 and into the ridge 18. Further expansion is required between the flutes 26 so as to define the shapes clearly.
  • the shape of figure 5 is a simple truncated bottle shape involving pure expansion 28 and loss of height as before.
  • the flange of the shaped can of figure 5 has been turned down at an angle of about 35° as indicated by flange 29 in figure 6.
  • Figure 7 is an assembly of the mould parts required to make the shaped can of figure 3.
  • the mould comprises three main parts: neck ring 30, middle part 32 and base support 34.
  • the base part 34 includes a separate dome support 35 for ease of loading/unloading the can preform.
  • the upper mould part 30, which is a neck ring, does not support the neck during expansion. This renders it difficult to apply an axial load to the can during expansion.
  • a thrust ring 31 is provided to apply the axial load through the flange and which may also be used to reshape the flange itself.
  • Figure 8 shows how the thrust ring 31 may be used to reshape the flange into the downturned angle of flange 29 in figure 6.
  • the thrust ring has been modified from the shape shown in figure 7 by extending the ring into the cavity of the can body.
  • the upper neck 14 of the can is engaged between the thrust ring 36 and the neck ring 30 by means of an O-ring 37 or similar seal.
  • the thrust ring 36 moves downwards so as to apply an axial load to the can transmitted via the end 39 of flange 9. Since the end 39 is restrained by the thrust ring, the flange itself is free to deform into a cavity or groove 38 via virtue of the load applied.
  • This cavity 38 is profiled to the desired final shape of the flange, here a downturned angle of about 35°, as shown in figure 8b.
  • Cans having a top wall thickness of 70T and a midwall thickness of 40T were blown into the shape of figure 3 using a blow pressure of 30 bar.
  • the axial load performance was assessed for both the blown cans and the unblown preforms. Whereas the unblown cans could take an axial load of 250 lbf before collapse, the blown cans collapsed at 56.5 lbf.
  • Cans having a top wall thickness of 70T and a midwall thickness of 54T were blown into the shape of figure 3 using a blow pressure of 35 bar.
  • the axial load performance for the preforms was 308 lbf, whereas that of the blown cans was 100 lbf.
  • the can must be able to withstand axial loads of around 80 lbf during the process for seaming a can end onto the can body if a body hook of sufficient length for a satisfactory seam is to be obtained.
  • this seaming requirement can be reduced to around 35 lbf. It is therefore believed that the thinner cans of example 1 could be seamed at pressures less than 56 lbf without either collapse or unsatisfactory seams if a further process to turn down the flange is added to the blowing process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

L'invention concerne un procédé de remodelage de contenants, en particulier de canettes métalliques embouties et étirées, dont on remodèle au moins la région du col. Ce procédé permet de former beaucoup de nouvelles formes à partir d'une canette cylindrique, par exemple celle d'un tonneau, ou de cannelures orientées dans différents sens autour du col et de la partie supérieure de la paroi latérale. Ces formes peuvent être souhaitables pour différencier des produits ou pour mettre en avant une image de marque. Le procédé permet également de remodeler la collerette en exerçant une pression axiale sur celle-ci.
PCT/GB1997/003035 1996-11-09 1997-11-05 Remodelage de contenants emboutis et etires WO1998020992A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU48750/97A AU4875097A (en) 1996-11-09 1997-11-05 Reshaping of drawn and wall ironed containers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9623364.8 1996-11-09
GBGB9623364.8A GB9623364D0 (en) 1996-11-09 1996-11-09 Reshaping of drawn and wall ironed containers

Publications (1)

Publication Number Publication Date
WO1998020992A1 true WO1998020992A1 (fr) 1998-05-22

Family

ID=10802710

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/003035 WO1998020992A1 (fr) 1996-11-09 1997-11-05 Remodelage de contenants emboutis et etires

Country Status (6)

Country Link
AR (1) AR010548A1 (fr)
AU (1) AU4875097A (fr)
CO (1) CO4770855A1 (fr)
GB (1) GB9623364D0 (fr)
WO (1) WO1998020992A1 (fr)
ZA (1) ZA979883B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD742251S1 (en) 2014-07-16 2015-11-03 Ball Corporation Two-piece contoured metallic container
USD758207S1 (en) 2014-08-08 2016-06-07 Ball Corporation Two-piece contoured metallic container
USD804309S1 (en) 2016-02-17 2017-12-05 Ball Corporation Metal bottle
US10239648B2 (en) 2014-10-28 2019-03-26 Ball Metalpack, Llc Apparatus and method for forming a cup with a reformed bottom
US10315242B2 (en) 2014-10-15 2019-06-11 Ball Metalpack, Llc Apparatus and method for simultaneously forming a contoured shoulder and neck portion in a closed end of a metallic container
EP4035792A3 (fr) * 2017-07-31 2022-11-02 Toyo Seikan Co., Ltd. Dispositif de fabrication de boîtes, boîte, et ensemble d'outils de fabrication de boîtes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757555A (en) * 1972-01-14 1973-09-11 Vermont Marble Co Can body expanding and flanging apparatus
GB2224965A (en) * 1988-08-31 1990-05-23 Metal Box Plc Methods and apparatus for reshaping hollow members
EP0521637A1 (fr) * 1991-07-04 1993-01-07 CarnaudMetalbox plc Dispositif et procédé de remodelage de récipients
WO1997012705A1 (fr) * 1995-10-02 1997-04-10 Crown Cork & Seal Technologies Corporation Dispositifs et procedes de fabrication de boites metalliques decoratives

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757555A (en) * 1972-01-14 1973-09-11 Vermont Marble Co Can body expanding and flanging apparatus
GB2224965A (en) * 1988-08-31 1990-05-23 Metal Box Plc Methods and apparatus for reshaping hollow members
EP0521637A1 (fr) * 1991-07-04 1993-01-07 CarnaudMetalbox plc Dispositif et procédé de remodelage de récipients
WO1997012705A1 (fr) * 1995-10-02 1997-04-10 Crown Cork & Seal Technologies Corporation Dispositifs et procedes de fabrication de boites metalliques decoratives
WO1997012704A1 (fr) * 1995-10-02 1997-04-10 Crown Cork & Seal Technologies Corporation Dispositifs et procedes de fabrication de boites metalliques decoratives façonnees
WO1997012706A1 (fr) * 1995-10-02 1997-04-10 Crown Cork & Seal Technologies Corporation Systemes et procedes de fabrication de boites metalliques decoratives faconnees

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD742251S1 (en) 2014-07-16 2015-11-03 Ball Corporation Two-piece contoured metallic container
USD758207S1 (en) 2014-08-08 2016-06-07 Ball Corporation Two-piece contoured metallic container
US10315242B2 (en) 2014-10-15 2019-06-11 Ball Metalpack, Llc Apparatus and method for simultaneously forming a contoured shoulder and neck portion in a closed end of a metallic container
US10239648B2 (en) 2014-10-28 2019-03-26 Ball Metalpack, Llc Apparatus and method for forming a cup with a reformed bottom
USD804309S1 (en) 2016-02-17 2017-12-05 Ball Corporation Metal bottle
EP4035792A3 (fr) * 2017-07-31 2022-11-02 Toyo Seikan Co., Ltd. Dispositif de fabrication de boîtes, boîte, et ensemble d'outils de fabrication de boîtes

Also Published As

Publication number Publication date
ZA979883B (en) 1998-05-25
AR010548A1 (es) 2000-06-28
GB9623364D0 (en) 1997-01-08
AU4875097A (en) 1998-06-03
CO4770855A1 (es) 1999-04-30

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