EP1308402A1 - Dome pour un bidon aérosol et bidon aérosol équipé avec ledit - Google Patents

Dome pour un bidon aérosol et bidon aérosol équipé avec ledit Download PDF

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Publication number
EP1308402A1
EP1308402A1 EP01204207A EP01204207A EP1308402A1 EP 1308402 A1 EP1308402 A1 EP 1308402A1 EP 01204207 A EP01204207 A EP 01204207A EP 01204207 A EP01204207 A EP 01204207A EP 1308402 A1 EP1308402 A1 EP 1308402A1
Authority
EP
European Patent Office
Prior art keywords
section
cone
countersink
top cone
central axis
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
EP01204207A
Other languages
German (de)
English (en)
Other versions
EP1308402B1 (fr
Inventor
Alan John Dr. Morris
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
Priority to EP20010204207 priority Critical patent/EP1308402B1/fr
Application filed by Corus Staal BV filed Critical Corus Staal BV
Priority to BR0213900-6A priority patent/BR0213900A/pt
Priority to AU2002325369A priority patent/AU2002325369B2/en
Priority to EP02758396A priority patent/EP1444148B1/fr
Priority to ES02758396T priority patent/ES2259094T3/es
Priority to DE60209747T priority patent/DE60209747T2/de
Priority to US10/494,270 priority patent/US7264144B2/en
Priority to AT02758396T priority patent/ATE319633T1/de
Priority to PCT/EP2002/008327 priority patent/WO2003039995A1/fr
Publication of EP1308402A1 publication Critical patent/EP1308402A1/fr
Priority to ZA200403397A priority patent/ZA200403397B/en
Application granted granted Critical
Publication of EP1308402B1 publication Critical patent/EP1308402B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a top cone for an aerosol can, comprising a formed metal sheet extending around a longitudinal central axis, and having a contour that comprises, as seen in longitudinal cross section from the top downward, a top section intended for holding a valve cap, a cone section that is connected to the top section and leading to a countersink section and a flange section, which countersink section is essentially U-shaped whereby the outer leg of the essential U-shape, that is the leg being furthest removed from the central axis, is bent away from the central axis to form the flange section, and which cone section has a continuously increasing transversal diameter.
  • U shaped is to be understood to include a contour of which the legs are not mutually parallel with to other, such as is the case in a V shape.
  • top cone is to be understood to include a semi product that has not yet been beaded or flanged, but nevertheless having sections suitable for these purposes.
  • a typical top cone for an aerosol can is shown in US patent 4418846.
  • the typical top cone is formed of metal sheet, has a beaded top section to hold a valve cap, a cone section that is generally shaped outwardly convex, and a flange section that is connected to the cone section via a countersink section that is generally U-shaped.
  • the top cone is secured to a body of an aerosol can via the flange section.
  • the aerosol can is usually filled under a pressure.
  • the pressure inside the aerosol can increases, the volume inside the top cone should, for safety reasons, increase as a result of the cone section moving outward, resulting in reduction of the pressure.
  • the pressure gets too high that is when the pressure exceeds a so-called reversal pressure, the cone will undergo plastically deformation. This is generally referred to as reversal failure.
  • a top cone for an aerosol can comprising a formed metal sheet extending around a longitudinal central axis, and having a contour that comprises, as seen in longitudinal cross section from the top downward, a top section intended for holding a valve cap, a cone section that is connected to the top section and leading to a countersink section and a flange section, which countersink section is essentially U-shaped whereby the outer leg of the essential U-shape, that is the leg being furthest removed from the central axis, is bent away from the central axis to form the flange section, and which cone section has a continuously increasing transversal diameter, whereby the top cone comprises strengthening means for strengthening the countersink section against pivoting toward the central axis.
  • the strengthening means should not completely block the countersink from pivoting, but the strengthening means should reduce the ease of the pivoting action. Otherwise, the top cone will not sufficiently increase the enclosed volume of the aerosol can in response to a pressure increase.
  • the strengthening means can be achieved by, for instance, provision of a reinforcement ring in the countersink, or a local thickening of the gauge in the countersink section allowing for reduction of the thickness outside the countersink section such that the over all weight is reduced. Preferred means will be described in more detail below.
  • the top cone is shaped to strengthen the countersink section against pivoting toward the central axis.
  • the strengthening against the inward pivoting of the countersink is at least in part achieved if the cone section is shaped to brace the counter sink section against pivoting toward the central axis.
  • the strengthening means comprises the cone section following essentially a straight trajectory whereby a bottom part of the cone section forms the inner leg of the essentially U-shaped countersink section. It is currently believed that the top cone design according to this embodiment of the invention offers good bracing resistance against the pivoting movement of the countersink section, thereby increasing the pressure required to cause structural failure of the aerosol top cone. Consequently, it is now possible to use a thinner gauge to obtain a top cone with a similar reversal pressure as was the case for the typical top cone.
  • the top cone according to the invention can be manufactured from a metal blank, preferably cut or stamped in the shape of a circular disc, using a multi step press forming process involving cupping the blank further moulding.
  • the metal may be aluminium or packaging steel, in particular tinplate steel, of which the steel-based variants are preferred.
  • top cone having the cone section that follows the essentially straight trajectory, is that for a certain blank size and top cone cross section, the depth of the countersink can be increased because this straight shape consumes less length of material. A deeper countersink has been found to further improve the reversal pressure.
  • the U-shaped counter sink is formed by an outwardly convex section connecting the two legs, the outwardly convex section having a relatively small radius so that the U-shape of the counter sink is essentially close to a V-shape.
  • the V-shaped countersink section is found to stiffen the countersink section, resulting in a sufficiently rigid countersink region to still pivot about the seam during the onset of cone reversal. Thus a safe progressive plastic roll-through upon final failure is maintained.
  • the radius of the convex section is smaller than 0.90 mm. More preferably it is smaller than 0.70 mm, and even more preferably it is smaller than 0.50 mm. It has been found that the reversal pressure is somewhat improved when the radius lies in the range between 0.90 mm and 0.70 mm; a more significant improvement has been found for a radius smaller than 0.70 mm. Surprisingly, a relatively strong improvement has been found when the radius is smaller than 0.50 mm.
  • the metal blank from which the top cone is manufactured is a polymer pre-coated metal blank. Because the blank is pre-coated with a polymer film, the coating layer is relatively robust against cracking. Thus, the countersink radius can be relatively small.
  • the invention in a second aspect, relates to an aerosol can.
  • the aerosol can according to this aspect of the invention comprises a body having a side wall that, on a bottom end, is provided with an end closure, and, connected to the end of the side wall opposite to the bottom end, a top cone according to one of the previous claims, the top cone being provided with a valve cap.
  • the end closure on the bottom of the aerosol can be integrally connected to the side wall, or it can be a separate component that is connected to the side wall, by for instance a sealed or flanged section. In the latter case, the top cone may perhaps be integrally connected to the side wall.
  • FIG. 1 schematically showing in cross section, a wall section 1 of an aerosol can, a valve cap 2, and a top cone 3.
  • This top cone comprises a bead 4 for holding the valve cap 2, a seamed flange 5, and a cone section 6 having an essentially spherical contour.
  • the cone section gradually becomes wider when considered from the top downward.
  • the seamed flange 5 and the cone section 6 are separated by a countersink section 7, which countersink section is essentially U-shaped.
  • a bottom part of the cone section forms one of the legs of the essentially U-shaped countersink 7.
  • the countersink part allows insertion of tooling that forms the seam 5 to get behind the material to form the join.
  • the distance d is referred to as the countersink depth.
  • FIG. 2 shows a cross section representation of the contour of the top cone in a region around the countersink region 7.
  • the flange section 51 has not yet been seemed.
  • Contour A shows the contour when there is no pressure inside the aerosol can, assuming that the top cone is actually seamed to an aerosol can body.
  • Contours B to E show successively the how the contour evolves with increasing pressure.
  • These contours are calculated using a finite element model that takes into account local material properties.
  • the countersink rolls upwards, pivoting around the upper position of the countersink towards the seam area.
  • the pivoting movement of the countersink section that results from pressure building up inside the aerosol can is schematically indicated by arrow 8.
  • the spherical dome 6 offers relatively little resistance against this pivoting action.
  • FIG. 3 schematically denotes the top cone according to an embodiment of the invention.
  • the drawn line represents the top cone as is may be incorporated in an aerosol can, having a bead 14 for holding a valve cap, and a seamed flange 15 for seaming onto the body of the aerosol can.
  • the dashed line shows how an intermediate product might look during manufacture.
  • the top section 10 is still a closed section and the bead is not yet implemented.
  • the flange section 11 is still flat.
  • the cone section 16 follows an essentially straight trajectory. This is thought to provide a degree of bracing (represented by the arrows 12) behind the countersink section, preventing it from rolling upwards during the early stages of reversal failure, and thereby increasing the pressure required to cause structural failure of the top cone.
  • the radius at the bottom of the countersink 17 can be reduced to further stiffen the countersink structure, with the result that during the onset of cone reversal, the countersink section remains sufficiently rigid to still pivot about the seam and retain a safe progressive plastic roll-through upon final failure of the top cone.
  • the straight cone section gives rise to another important advantage.
  • the long perimeter of the spherical cone uses a significant proportion of the material, fixing the overall final diameter of the top cone. Because a straight cone section takes the shortest distance between the top section and the bottom of the countersink section, the design releases a certain amount of material to make a deeper countersink for a given blank cut-diameter, retaining the original final diameter.
  • the countersink depth d significantly influences the aerosol top cone in terms of reversal strength.
  • a change of as little as 1 mm may affect the reversal pressure by as much as 20 %.
  • a double improvement should thus result using the top cone having a straight cone section, with contributions to reversal strength from increased countersink depth combined with the bracing by straight cone.
  • the countersink radius can significantly influence the aerosol top cone in terms of reversal pressure.
  • a small improvement of about 0.6 bar is observed using a radius of 0.70 mm compared to a radius of 0.95 mm. Below 0.70 mm, the effect clearly becomes stronger, and surprisingly below 0.50 mm the relative effect becomes even stronger.
  • An improvement of about 15 % is observed by reducing the countersink radius from 0.95 mm to 0.25 mm.
  • the cone design according to FIG. 1, having a spherical cone section 6, has a reversal strength of 15.5 bar when manufactured from packaging steel.
  • This design has a countersink depth d of 4.8 mm, and a radius projected of 34.5 mm before flanging the seam 5.
  • the reversal pressure is 19.5 bar, representing an overall improvement of 26 % over the original top cone.
  • the blank gauge used in the above examples is 0.32 mm.
  • the higher reversal pressure now gives the option of reducing the blank gauge by an amount to obtain a top cone having the original 15.5 bar. It has been found that the blank gauge can be reduced by 0.04 mm to a thickness gauge of 0.28 mm, i.e. by 12.5 %.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
EP20010204207 2001-11-05 2001-11-05 Dome pour un bidon aérosol et bidon aérosol équipé avec ledit Expired - Lifetime EP1308402B1 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP20010204207 EP1308402B1 (fr) 2001-11-05 2001-11-05 Dome pour un bidon aérosol et bidon aérosol équipé avec ledit
PCT/EP2002/008327 WO2003039995A1 (fr) 2001-11-05 2002-07-24 Cone superieur pour reservoir aerosol et reservoir aerosol pourvu de ce cone
EP02758396A EP1444148B1 (fr) 2001-11-05 2002-07-24 Cone superieur pour reservoir aerosol et reservoir aerosol pourvu de ce cone
ES02758396T ES2259094T3 (es) 2001-11-05 2002-07-24 Cono superior para una lata de aerosol, y una lata de aerosol provista del mismo.
DE60209747T DE60209747T2 (de) 2001-11-05 2002-07-24 Dom für eine aerosoldose und aerosoldose mit einem solchen dom
US10/494,270 US7264144B2 (en) 2001-11-05 2002-07-24 Top cone for an aerosol can, and aerosol can provided with the same
BR0213900-6A BR0213900A (pt) 2001-11-05 2002-07-24 Cone superior para uma lata de aerossol, e lata de aerossol fornecida com o mesmo
AU2002325369A AU2002325369B2 (en) 2001-11-05 2002-07-24 Top cone for an aerosol can, and aerosol can provided with the same
AT02758396T ATE319633T1 (de) 2001-11-05 2002-07-24 Dom für eine aerosoldose und aerosoldose mit einem solchen dom
ZA200403397A ZA200403397B (en) 2001-11-05 2004-05-05 Top cone for an aerosol can, and aerosol can provided with the same.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20010204207 EP1308402B1 (fr) 2001-11-05 2001-11-05 Dome pour un bidon aérosol et bidon aérosol équipé avec ledit

Publications (2)

Publication Number Publication Date
EP1308402A1 true EP1308402A1 (fr) 2003-05-07
EP1308402B1 EP1308402B1 (fr) 2005-06-01

Family

ID=8181185

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010204207 Expired - Lifetime EP1308402B1 (fr) 2001-11-05 2001-11-05 Dome pour un bidon aérosol et bidon aérosol équipé avec ledit

Country Status (2)

Country Link
EP (1) EP1308402B1 (fr)
ZA (1) ZA200403397B (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418846A (en) * 1980-01-04 1983-12-06 American Cyanamid Company Aerosol dispensing system
US5211317A (en) * 1992-06-18 1993-05-18 Diamond George Bernard Low pressure non-barrier type, valved dispensing can
US5636761A (en) * 1995-10-16 1997-06-10 Dispensing Containers Corporation Deformation resistant aerosol container cover
US5954239A (en) * 1992-11-10 1999-09-21 Evnx Technologies, Inc. Aerosol spray dispenser with swinging downtube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418846A (en) * 1980-01-04 1983-12-06 American Cyanamid Company Aerosol dispensing system
US5211317A (en) * 1992-06-18 1993-05-18 Diamond George Bernard Low pressure non-barrier type, valved dispensing can
US5954239A (en) * 1992-11-10 1999-09-21 Evnx Technologies, Inc. Aerosol spray dispenser with swinging downtube
US5636761A (en) * 1995-10-16 1997-06-10 Dispensing Containers Corporation Deformation resistant aerosol container cover

Also Published As

Publication number Publication date
EP1308402B1 (fr) 2005-06-01
ZA200403397B (en) 2005-05-23

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