EP1294622B1 - Druckfeste metallverpackung bestehend aus einer metalldose und verfahren zu ihrer herstellung - Google Patents

Druckfeste metallverpackung bestehend aus einer metalldose und verfahren zu ihrer herstellung Download PDF

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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
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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
Application number
EP01951605A
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English (en)
French (fr)
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EP1294622A1 (de
Inventor
Cornelis Martinus Joseph Weijers
Frederik Jonker
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.)
Tata Steel Ijmuiden BV
Original Assignee
Corus Staal BV
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 Corus Staal BV filed Critical Corus Staal BV
Priority to EP01951605A priority Critical patent/EP1294622B1/de
Publication of EP1294622A1 publication Critical patent/EP1294622A1/de
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Publication of EP1294622B1 publication Critical patent/EP1294622B1/de
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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)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Cartons (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Laminated Bodies (AREA)
  • Stackable Containers (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Claims (11)

  1. Metalldose, die eine druckfeste Metallverpackung ist, mit einer abgestreckten Seitenwand, die sich im wesentlichen entlang einer axialen Richtung und einer Umfangsrichtung erstreckt, und einem ersten Endverschluß angrenzend an die Seitenwand in einem ersten Wand-zu-Verschluß-Übergangsabschnitt, und einem zweiten Endverschluß angrenzend an die Seitenwand in einem zweiten Wand-zu-Verschluß-Übergangsabschnitt, wobei die Seitenwand einen Hauptseitenwandabschnitt aufweist, der sich von dem ersten Wand-zu-Verschluß-Übergangsabschnitt zu dem zweiten Wand-zu-Verschluß-Übergangsabschnitt erstreckt, wobei der Hauptseitenwandabschnitt mit Mitteln erhöhter Seitenwanddicke versehen ist, die die Seitenwand im wesentlichen entlang des Umfangs der Dose stützen, bestehend aus einem ringförmigen Abschnitt aus wandabgestrecktem Metall, bei welchem die Dicke der Seitenwand größer als die Seitenwanddicke in dem Hauptseitenwandabschnitt außerhalb des ringförmigen Abschnitts ist, dadurch gekennzeichnet, daß der eine ringförmige Abschnitt wandabgestrecktes Metall aufweist, das um mehr als 39, 4 % in der Dicke reduziert wurde, und die Seitenwanddicke in dem ringförmigen Abschnitt weniger als 40 µm dicker als die Seitenwanddicke in dem restlichen Hauptseitenwandabschnitt ist.
  2. Metalldose nach Anspruch 1, dadurch gekennzeichnet, daß der eine ringförmige Abschnitt wandabgestrecktes Metall aufweist, das in der Dicke um mehr als 41,6 %, bevorzugt um mehr als 45,1 % reduziert wurde.
  3. Metalldose nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Hauptseitenwandabschnitt außerhalb des ringförmigen Abschnitts wandabgestrecktes Metall aufweist, das in der Dicke um mehr als 50,6 % reduziert wurde.
  4. Metalldose nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Hauptseitenwandabschnitt Stahl, bevorzugt Verpackungsstahl aufweist.
  5. Metalldose nach Anspruch 1, dadurch gekennzeichnet, daß der ringförmige Abschnitt im wesentlichen entlang des gesamten Umfangs von einer Querschnittsebene durch die Metalldose geschnitten wird, die in der Mitte zwischen dem ersten Wand-zu-Verschluß-Übergangsabschnitt und dem zweiten Wand-zu-Verschluß-Übergangsabschnitt liegt.
  6. Metalldose nach Anspruch 1 oder 5, dadurch gekennzeichnet, daß der ringförmige Abschnitt eine Umfangsrippe ist, die von der Innenfläche der Seitenwand nach innen in die Verpackung ragt.
  7. Metalldose nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Seitenwanddicke in dem ringförmigen Abschnitt nicht mehr als 28 µm, bevorzugt nicht mehr als 22 µm dicker als die Seitenwanddicke in dem restlichen Hauptseitenwandabschnitt ist.
  8. Metalldose nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der ringförmige Abschnitt aus der Sicht in einem Längsschnitt der Metalldose einen Abschnitt aufweist, bei welchem die Seitenwanddicke über eine axiale Strecke konstant ist.
  9. Metalldose nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Dicke der Seitenwand in dem ringförmigen Abschnitt des Hauptseitenwandabschnitts aus der Sicht in einem Längsschnitt der Metalldose und gemessen in zunehmenden Abständen von dem ersten Endverschluß zunächst allmählich von der Dicke der Seitenwand außerhalb des ringförmigen Abschnitts bis zu einer maximalen Dicke der Seitenwand innerhalb des ringförmigen Abschnitts über einen Schnitt mit einer axialen Länge D1 zunimmt und dann von der maximalen Dicke zu der Dicke in dem restlichen Hauptseitenwandabschnitt außerhalb des ringförmigen Abschnitts über einen Schnitt mit einer axialen Länge D2 abnimmt, die kürzer als D1 ist, und wobei der erste Endverschluß mit der Seitenwand einstückig ist.
  10. Metalldose nach einem der vorhergehenden Ansprüche; dadurch gekennzeichnet, daß der erste Endverschluß mit der Seitenwand einstückig ist und die Dicke der Seitenwand aus der Sicht in einem Längsschnitt der Metalldose in einem Schnitt des ringförmigen Abschnitts des Hauptseitenwandabschnitts, gemessen in zunehmenden Abständen von dem ersten Endverschluß, allmählich von der Dicke der Seitenwand außerhalb des ringförmigen Abschnitts bis zu einer maximalen Dicke der Seitenwand innerhalb des ringförmigen Abschnitts zunimmt, wobei in diesem Schnitt die Oberfläche der Seitenwand innerhalb der Verpackung bezüglich der entsprechenden Oberfläche der Seitenwand an der Außenseite der Verpackung in einem Winkel zwischen 0,01 und 5° verkeilt ist, bevorzugt in einem Winkel zwischen 0,01 und 1°, bevorzugter in einem Winkel zwischen 0,01 und 0,25°.
  11. Verfahren zur Herstellung einer Metalldose, die eine druckfeste Metallverpackung ist, mit einer abgestreckten Seitenwand, die sich im wesentlichen entlang einer axialen Richtung und einer Umfangsrichtung erstreckt, und einem ersten Endverschluß angrenzend an die Seitenwand in einem ersten Wand-zu-Verschluß-Übergangsabschnitt, und einem zweiten Endverschluß angrenzend an die Seitenwand in einem zweiten Wand-zu-Verschluß-Übergangsabschnitt, wobei die Seitenwand einen Hauptseitenwandabschnitt aufweist, der sich von dem ersten Wand-zu-Verschluß-Übergangsabschnitt zu dem zweiten Wand-zu-Verschluß-Übergangsabschnitt erstreckt, wobei der Hauptseitenwandabschnitt mit Mitteln erhöhter Seitenwanddicke versehen ist, die die Seitenwand im wesentlichen entlang des Umfangs der Dose stützen, bestehend aus einem ringförmigen Abschnitt aus wandabgestrecktem Metall, bei welchem die Dicke der Seitenwand größer als die Seitenwanddicke in dem Hauptseitenwandabschnitt außerhalb des ringförmigen Abschnitts ist, wobei das Verfahren die Schritte aufweist, daß (i) Näpfe in wenigstens einer Zugoperation hergestellt werden, (ii) die Seitenwanddicke unter Verwendung wenigstens eines Abstreckstempels und eines Prägestempels reduziert wird, der einen Formumriß im Längsquerschnitt mit einem im wesentlichen geraden Schnitt hat, der mit einer Ausnehmung versehen ist, wobei die Ausnehmung zum Bilden des ringförmigen Abschnitts vorgesehen ist, dadurch gekennzeichnet, daß die Ausnehmung eine Tiefe von weniger als 40 µm hat und die Dicke des Hauptseitenwandabschnitts, wo die Ausnehmung angeordnet ist, von wenigstens 313,5 µm auf weniger als 190 µm reduziert ist.
EP01951605A 2000-06-16 2001-06-14 Druckfeste metallverpackung bestehend aus einer metalldose und verfahren zu ihrer herstellung Expired - Lifetime EP1294622B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01951605A EP1294622B1 (de) 2000-06-16 2001-06-14 Druckfeste metallverpackung bestehend aus einer metalldose und verfahren zu ihrer herstellung

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 (de) 2000-06-16 2001-06-14 Druckfeste metallverpackung bestehend aus einer metalldose und verfahren zu ihrer herstellung

Publications (2)

Publication Number Publication Date
EP1294622A1 EP1294622A1 (de) 2003-03-26
EP1294622B1 true EP1294622B1 (de) 2004-04-07

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EP01951605A Expired - Lifetime EP1294622B1 (de) 2000-06-16 2001-06-14 Druckfeste metallverpackung bestehend aus einer metalldose und verfahren zu ihrer herstellung

Country Status (12)

Country Link
US (1) US20040040970A1 (de)
EP (1) EP1294622B1 (de)
CN (1) CN1210194C (de)
AT (1) ATE263722T1 (de)
AU (1) AU769793B2 (de)
BR (1) BR0111728A (de)
DE (1) DE60102697T2 (de)
DK (1) DK1294622T3 (de)
ES (1) ES2218430T3 (de)
PT (1) PT1294622E (de)
TR (1) TR200401193T4 (de)
WO (1) WO2001096209A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1812184A2 (de) * 2004-10-15 2007-08-01 Corus Staal BV Metalldosenkörper
KR102101137B1 (ko) 2010-08-20 2020-04-14 알코아 유에스에이 코포레이션 성형 금속 용기 및 그 제작 방법
CN117884533A (zh) * 2024-03-15 2024-04-16 蜂巢能源科技股份有限公司 盖板装配成型工艺及盖板

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667193A1 (de) * 1994-02-15 1995-08-16 Toyo Seikan Kaisha Limited Verfahren zur Herstellung falznahtloser Dosen

Family Cites Families (6)

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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 (de) * 1979-09-13 1981-04-02 Schmalbach-Lubeca Gmbh, 3300 Braunschweig Einendig offener behaelter aus metall
NL8301069A (nl) * 1983-03-28 1984-10-16 Hoogovens Groep Bv Driedelige metalen verpakkingsbus, halfprodukt voor de vervaardiging van deze bus, en een werkwijze voor de vervaardiging van metalen verpakkingsbussen.
DE4443434A1 (de) * 1994-12-06 1996-06-20 Schmalbach Lubeca Wanddickenverteilung im Dosenmündungsabschnitt
US5938389A (en) * 1996-08-02 1999-08-17 Crown Cork & Seal Technologies Corporation Metal can and method of making

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667193A1 (de) * 1994-02-15 1995-08-16 Toyo Seikan Kaisha Limited Verfahren zur Herstellung falznahtloser Dosen

Cited By (4)

* Cited by examiner, † Cited by third party
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
WO2001096209A1 (en) 2001-12-20
PT1294622E (pt) 2004-08-31
TR200401193T4 (tr) 2004-07-21
BR0111728A (pt) 2003-05-27
CN1436144A (zh) 2003-08-13
AU7248801A (en) 2001-12-24
DE60102697T2 (de) 2005-04-07
DK1294622T3 (da) 2004-07-19
DE60102697D1 (de) 2004-05-13
EP1294622A1 (de) 2003-03-26
ATE263722T1 (de) 2004-04-15
ES2218430T3 (es) 2004-11-16
CN1210194C (zh) 2005-07-13
AU769793B2 (en) 2004-02-05
US20040040970A1 (en) 2004-03-04

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