EP1121299B1 - Systeme anti-eclatement temporaire installe dans un couvercle en tole - Google Patents

Systeme anti-eclatement temporaire installe dans un couvercle en tole Download PDF

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Publication number
EP1121299B1
EP1121299B1 EP99953760A EP99953760A EP1121299B1 EP 1121299 B1 EP1121299 B1 EP 1121299B1 EP 99953760 A EP99953760 A EP 99953760A EP 99953760 A EP99953760 A EP 99953760A EP 1121299 B1 EP1121299 B1 EP 1121299B1
Authority
EP
European Patent Office
Prior art keywords
lid
notch line
opening
line
section
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
EP99953760A
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German (de)
English (en)
Other versions
EP1121299A1 (fr
Inventor
Lutz Strube
Peter Hoeft
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.)
Ardagh Metal Packaging Germany GmbH
Original Assignee
Schmalback Lubeca AG
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 Schmalback Lubeca AG filed Critical Schmalback Lubeca AG
Publication of EP1121299A1 publication Critical patent/EP1121299A1/fr
Application granted granted Critical
Publication of EP1121299B1 publication Critical patent/EP1121299B1/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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/404—Details of the lines of weakness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S220/00—Receptacles
    • Y10S220/906—Beverage can, i.e. beer, soda

Definitions

  • the invention relates to a lid made of metal with an opening system for standing in the closed state under positive or negative pressure container, for example, beverage cans, and a method for its preparation.
  • a lid made of metal with an opening system for standing in the closed state under positive or negative pressure container, for example, beverage cans, and a method for its preparation.
  • the can before opening the lid (by means of the opening system) under an internal pressure of about 3.0 to 5.8 bar, depending on the contents, the degree of filling, of the Storage temperature and transport treatment.
  • the shear-breaking score line for opening the container first tears in or out near the tensile or compressive point of a grip tab.
  • the opening causes the opening segment of the lid mirror, which is determined by the score line, to pop out uncontrollably or abruptly. This creates a risk of injury to hands, face and eyes.
  • the residual wall thickness remaining below the score line is larger, ie less weakened, than the adjacent areas of the score line.
  • the usual test guarantee for beverage cans is at 6.2 bar (90 psi or 620 kPa) as a minimum.
  • This, initially limiting the opening or blocking (short: blocking) score line can also be used in other containers, such as low pressure containers. Used for tennis ball cans, it also provides clearance barriers in the pressure range from 1.5 bar (150 kPa) to 2.5 bar (250 kPa).
  • the previous system has proven itself in practice, but is subject in manufacturing various critical problem areas that require a high control effort. Due to the increased residual wall thickness in the blocking region, increased wear of the embossing scoring knife comb has disadvantages for the accuracy of the control of the further ripping process. This may result in the further tearing of the opening area after the temporary blockage of the separation process is not (more) follows the score line exactly. Another problem is that in the restricted area uncontrollable or too high tearing forces are necessary, which can lead to excessive residual wall thickness to the fact that the opening process can not be continued and completed. On the other hand, if the residual wall thickness is too small, the protective effect can be omitted since the temporary blocking of the opening process does not occur or does not occur with sufficient safety. Especially with an arrangement of the scribe line so that it tapers to a point and two Aufplatzsperren are required, both sides of a rounded tip, emanating from the two score line segments, the previous concept has not been successful.
  • the residual wall thickness substantially equals and does not significantly differ from the residual wall thickness in the adjoining, and in particular the remaining, portion of the score line.
  • the temporary blocking of the tearing operation is achieved by deviating, in the selected, ie predetermined and limited area of the score line, the metal structure in the region of the residual wall substantially from the structure in the adjacent regions of the score line.
  • this metal structure is changed in a compacting manner.
  • the compression is a relief of impressed tensile stresses.
  • the metal sheet is weakened and tensile stresses are programmed, as it were, by inserting the score line below the score line, due to the lateral displacement of the material, thus favoring bursting, in the short area leading to temporary obstruction the time of pressure equalization is used, the programmed tension lowered, until fully compensated.
  • This compensation provides for a reduction in shear, thus strengthening the already about 20% lower shear strength of the metal compared to its tensile strength.
  • the result is a breaking away of the shear lines when opening from the tracking of the scribe line, if the temporary opening lock was too intense, so the residual wall needed too high a shear force to be separated. If, on the other hand, the residual wall is set too low, it can not unfold its temporary blocking effect, but immediately breaks completely upon pulsed pressure escape.
  • this microstructure temporarily stops the initial opening operation reliably at the predetermined point of the score line, so that the required and desired protective effect against the dangers indicated above is reliably achieved.
  • the notching tool or a corresponding scoring knife has a longer service life. The longer service life can also be favored in that the additional embossing tool with laterally impressed line pieces is located outside the actual score line.
  • the actual score line is reduced to rupture in width.
  • the width defining walls left and right of the indented notch with the bottom lying below change after the second engagement of the embossing tool.
  • Preferred values are a reduction to 30% to 70% of the original width, in particular at least 50% (claim 16). If a greater reduction is made by a stronger material displacement from the outside to the score line, and the score line reason completely disappear and stunt to an open-topped circular shape.
  • the walls are in each case made somewhat steeper and move closer to each other, wherein the change of the slope and the reduction of the width of the depth and the width of the stamping lines on both sides of the score line is dependent.
  • the tools used to produce the microstructure change effected according to the invention with a narrower kerf line section are substantially more stable and less prone to wear, such as a normal scribing knife (also embossing comb) which is uneven in its engagement height (or depth).
  • the structure change is effected by acting on the cover sheet from outside the score line forth.
  • the action on the cover sheet outside the score line can be made from any direction, ie from the side or from below, the effect is in any case directed so that the lid material or the microstructure is compressed below the opening for opening score line, especially at strong influence of the side of a relaxed in their tensile stresses microstructure is obtained.
  • a voltage-neutral zone is mechanically much more stable and achieves the same notch line depth along the entire starting portion of the opening serving score line and also beyond a temporary opening blockage or opening lock, which is able to compensate for the pulse-like escape of pressure caused by pressure difference from the environment.
  • the temporary lock can be overcome by the user of the grip tab in a continued opening process, so that the tear-open is exposed to the score line on the score line.
  • the temporary blockage is therefore not a permanent blockage when the user overcomes the mechanically solidified residual wall shortly after the beginning of the opening process by a mechanically increased force.
  • the deformation of the microstructure is very conceivable when two short score pieces are imprinted directly next to the score line that serves to open.
  • the area of the barrier has usually been that which was less solidified or had a looser structure, because here the residual wall had a greater strength and thus the incipient tearing process was temporarily interrupted.
  • this area is substantially the same in thickness as the train of score lines before and after this area. Nevertheless, however, comes through a lateral squeezing of material by impressing lateral embossing pieces a mechanical solidification, which achieves a controlled opening after impulsartigem escape of overpressure or impulsartigem compensation of the negative pressure (claim 11).
  • the score line according to the invention may have substantially uniform depth (claim 2).
  • the mentioned reduction of the tensile stresses below the score line can be done from one side or both sides of the opening score line (claim 3). If the temporary barrier should not be too strong mechanically, a very short length is recommended as one-sided or bilaterally displaced notched pieces, which, however, are located very close to the starting section, ie locally close to the initial break-in area of the score line.
  • the depth of the two short score lines next to the main score line can be controlled.
  • the depth By controlling the depth, the material compression under the main score line can be controlled in shape and tension relief.
  • the depth of the additional embossing line pieces can be between 0.17 mm and 0.08 mm, ie in particular have a greater depth, than the main score line for opening (claim 4).
  • a rounded profile at the bottom of the side crush (claim 5) has a preferential effect over a greater depth range in the direction of compaction of the whip lines or flow lines on the notch line lying under the notch area, narrowing the notch line with closer opposite walls occurs (claim 7, claim 16).
  • score line As far as the term “score line” has been used, the person skilled in the art also understands an embossing or scoring line or a weakening line introduced by other means, which allows a tear-open segment to be separated from the remaining cover mirror of the cover by shear forces for opening; such terms as tearing or tearing should be considered technically equivalent. Gearing is a densification of the poultry line of the metal.
  • FIG. 1a shows a tear-open lid 1 with a folded edge 2 on a lid mirror 3.
  • a tear-off region 4 is defined by a score line 8 which is opened by means of an annular grip tab 6 which is fastened to the tear-open region 4 by means of rivet 5 Container can be completely detached from the lid.
  • the handle tab 6 By tilting the handle tab 6 relative to the lid mirror, the score line in the region of the rivet 5 is initially brought to break.
  • the opening process can then be continued by tearing along the score line 8 until the tear region 4 is completely released.
  • FIG. 1b the tear-open region 4 is shown on an enlarged scale.
  • 5a the location for fixing the pull tab 6 is indicated.
  • a narrow area 7 which serves to provisionally stop the tearing after the initial breaking of the score line, so that without risk to the user pressure equalization can take place before pulling the handle tab 6 the opening process is continued.
  • FIG 2a shows the same situation with a metal cover of another genus.
  • the tear region 12 is shown.
  • the attachment point for the grip tab lies at 13a, ie outside the tear-open area.
  • a lever-grip tab 14 is raised up here as well. It tilts around its attachment point 13 and presses the tear-open area 12 into the interior of the container.
  • the tearing process begins near the attachment point 13a.
  • similar means 7a for provisionally stopping the initial tearing operation are arranged.
  • Figures 1 and 2 show conventional lids made of sheet metal with a "central panel” (cover mirror) 10.3 and a seam edge. 2
  • FIG. 3 shows the usual way of forming a block 7 or 7a for temporarily stopping the initial tearing operation.
  • the cover sheet is shown in the area of the score line 8 or 11.
  • 17 indicates the normal residual wall thickness d2 below the score line.
  • a larger residual wall thickness d3 is provided below the score line, as indicated at 18.
  • the metal structure 19 below the score line is pinched but otherwise not substantially altered.
  • the walls 16 of the score line 8,11 (often also called “score line” or “score line”) are inclined, as a result of imprinting with an embossing punch or scoring anvil.
  • the image shown schematically in FIG. 3 can be illustrated by means of a real section through a metal cover with a corresponding magnification, as shown in FIG.
  • FIG. 8 and FIG. 8a the trapezoidal score line is shown in section 7, 7a of FIGS. 1, 2, wherein the residual wall thickness shown is greater than the remaining wall thickness, which is not visible in FIGS. 8, 8a, which is reduced at the lower embossed remaining score line 8.
  • a drawn out flow line 19x in the metal structure 19 is below the score line. Also evident is the effect of the embossment in an area 19e farther below the score line, which reflects the image of the score line weakened.
  • the lower surface of the metal lid is flat and not changed in the area 7 with respect to the remaining lower surface.
  • the obliquely upward extending side walls 16 go directly into the transition points 16a, 16b in the surface of the lid mirror. Due to the imprint, the direct transitions are even slightly lowered compared to an imaginary flat plane on the lid mirror. Particularly in the enlargement of FIG.
  • this direct transition 16a, 16b can be clearly seen in the upper edge regions of the score line 8, the groove bottom 8g of the groove 8 corresponding to that of FIG.
  • the groove bottom 8g is narrower than the width b1 of the score line between the transition portions 16a, 16b, which is designated by b1 in FIG.
  • FIGS. 4 to 7 stopping of the initial break-in operation is differently caused by the same types of covers as in FIGS. 1 and 2.
  • the position of the blockages with respect to the attachment points 5a, 5, 13a, 13 of the grip tabs 14, 6 is essentially the same as in FIGS. 1 and 2.
  • FIG. 4 shows, on a larger scale, a tear-open region 22, which corresponds to the tear-open segment 4 according to FIG.
  • the tear-open area 22 is delimited by a continuous score line 21.
  • the fastening point 23 is provided for a (lever-shaped or gripping-type) grip tab.
  • This is the "start region" S of the opening process, which continues by separating the score line along the path K.
  • limited areas 24 are provided on both sides of a center line M of the tear-open area, which areas serve to provisionally stop the tearing process.
  • the mean distance 26 of these areas from the attachment point 23 is indicated by A. It may be in a specific embodiment at about 1.5 to 3.5 mm, so it is slightly further away from the point 23, as the blocks 7,7a of Figures 1,2.
  • the score line 21 is continuously running consistently deep with a uniform notching tool. It also has the same residual wall thickness d2 in region 24 as in the adjoining, and in particular the entire remaining score line region.
  • the cover plate 35 in the metal structure 38 below the score line 21 is substantially changed in such a way that in this area a microstructure freed of tensile stress is present in relation to the metal structure in the adjacent residual wall areas.
  • This denser metallic structure provides a sufficient stopping effect for the tearing process during the initial opening, even at high pressure differences to be compensated, so that a change in the score line k2 is not required.
  • the denser texture is achieved not by a modified action of the scoring tool, but by the metal structure in its flow or guillotine lines being constrained by a limited length crushing or compression 27a, 27b and Q1, Q2, respectively, from one or both sides of the score line 21 is changed considerably.
  • a bead or a notch piece 27a, 27b is embossed linearly in a distance 28 which corresponds approximately or at least to the score line from the center of the score line and parallel to the limited portion 24 of the score line.
  • the center distance of the tearing score line and the squish bead or notch may be at a concrete embodiment about 0.5 to 1 mm.
  • the preferred length L of the notch pieces 27a, 27b in the limited area 24 may be between about 1.5 and 6 mm.
  • the residual wall thickness of the adjacent or further lying away Kerbliniensegmente no deformation of the metal structure.
  • the notch pieces 27a, 27b may be introduced simultaneously with the creation of the score line. However, they can also be impressed later in a separate step. In the latter case, the edge slope of the opening score line changes in section 24, as shown by the solid flank 37 as compared to the dashed flank 36 in FIG.
  • the notch pieces Q1, Q2 extend slightly deeper than the opening to be opened score line 21, as shown in Figure 7 can be seen. It may be useful to round the bottom contour 39 of the notch pieces, in contrast to a trapezoidal cross-sectional shape of the score line.
  • the residual wall 42 with a thickness d2 below the score line in the section 24 is thus slightly larger than the thickness d1 of the residual wall 41 under the pieces Q1, Q2.
  • the flank angle 40 of the additional notch pieces should be about 5 ° ⁇ ⁇ ⁇ 15 °.
  • FIGS. 9 , 9a are a section and an enlargement to the scale shown there at the point 24, wherein the lateral notched pieces 27a, 27b and / or Q1, Q2 are not recognizable in the micrographs because they are outside the image area.
  • the flow lines 38y and 38x which are specially marked out in the area 38 below the score line, run steeper below the score line 21 than in FIG. 8, in which a flow line 19x with a slight slope in the area 19 under the score line 8 is drawn out ,
  • This state 19x is also maintained in the area of the score line outside the short section 24 in the new design of the score line 21 of Figure 9, so that the flow lines from a flat slope in the remaining area to a steeper slope 38x, 38y in the blocking or Change the blocking section.
  • transition region 37a, 37b the increase in the transition region 37a, 37b from the sloping walls 49a, 49b of the section 24 to the rest of the cover mirror 20 and 30 of Figures 4 and 5, respectively.
  • transitions are continuous between the wall and the remaining cover mirror, but have an increase in relation to the plane, so that here the specially deformed flow lines are also visible from the outside.
  • the embodiment in another form of a tear-open region 33 according to FIG. 5 is corresponding.
  • a remaining on the lid tear segment 33 is limited, which is opened by means of a gripping tab, not shown, which is attached at 32.
  • the embossments Q1, Q2 laid laterally next to the score line are arranged to stop the opening process, which correspond to the notch pieces 27a, 27b.
  • the shape, size and position of the notch pieces 27a, 27b, Q1, Q2, and the residual wall thickness d1 among these pieces determine the strength of the relaxation of the structure and thus the extent of the blocking effect after initial opening. It is adjustable by changing notches outside (actually next to) the opening score line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Closures For Containers (AREA)
  • Push-Button Switches (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Ladders (AREA)
  • Safety Valves (AREA)

Claims (16)

  1. Couvercle en tôle métallique (1; 9) pour récipients se trouvant, à l'état fermé, sous pression élevée par rapport à la pression ambiante, notamment pour boîtes de boisson, ledit couvercle présentant un panneau (3, 10, 20, 30) conformé sensiblement à plat, une zone enfonçable (4; 11; 33; 22) du panneau formant couvercle plus petite par rapport au panneau, déterminée par une ligne entaillée (8; 11; 21; 31) et une patte de préhension (6; 14) servant à l'ouverture de la petite zone, qui est appliquée sur le panneau formant couvercle;
    caractérisé en ce que
       après une section d'amorce (S) de la ligne entaillée (21; 31), il est prévu une pièce (24, 25, L) de longueur limitée, dans laquelle la structure métallique (38) ou les lignes structurelles (38x, 38y) de la tôle sont sensiblement plus denses en dessous de la ligne entaillée par rapport à une structure métallique (19) située en dessous d'au moins la ligne entaillée adjacente à la pièce (L), en particulier du restant de la ligne entaillée (21; 31) pour bloquer momentanément une opération d'ouverture difficile à contrôler après enfoncement initial de la ligne entaillée (21; 31).
  2. Couvercle selon la revendication 1, caractérisé en ce qu'une épaisseur de paroi résiduelle (42, d2) dans la section limitée (24, 25) en dessous de la ligne entaillée correspond sensiblement à l'épaisseur de paroi résiduelle au moins dans les sections adjacentes de la ligne entaillée (21; 31).
  3. Couvercle selon la revendication 1 ou 2, caractérisé en ce que, dans le panneau formant couvercle (20; 30), à (faible) distance (28) de la ligne entaillée (21; 31), est renfoncée, en particulier estampée - sur l'une ou les deux faces - une pièce linéaire (27a, 27b; Q1, Q2) s'étendant sur la section de longueur limitée.
  4. Couvercle selon la revendication 1, dans lequel une ligne d'estampage (27a, 27b) de longueur limitée ménagée à distance latérale (28) de la ligne entaillée dans la zone limitée présente une plus grande profondeur (d-d1) que la ligne entaillée (21; 31) servant à l'ouverture.
  5. Couvercle selon l'une quelconque des revendications précédentes, dans lequel - en vue en coupe transversale - au moins une pièce linéaire de longueur limitée (27a, 27b) présente, sur sa partie inférieure, un profil de fond arrondi (39), qui est ménagé à distance (28) de la section de ligne entaillée (24) prévue comme zone bloquante.
  6. Couvercle selon la revendication 1, dans lequel une zone de la structure (38) présente, en dessous de la ligne entaillée (21, 31), dans la section (24) de longueur limitée, des lignes d'écoulement ou lignes structurelles (19x) qui s'étendent de manière plus raide que les lignes d'écoulement ou lignes structurelles des deux sections de la ligne entaillée, qui délimitent la section limitée (24) sur les deux côtés.
  7. Couvercle en tôle métallique pour récipients se trouvant, à l'état fermé, sous pression élevée par rapport à la pression ambiante, notamment pour boîtes de boisson, ledit couvercle présentant un panneau (3, 10, 20, 30) conformé sensiblement à plat, une zone enfonçable (4; 11; 33; 22) du panneau formant couvercle plus petite par rapport à celui-ci, déterminée par une ligne entaillée (8; 11; 21; 31) et une patte de préhension (6; 14) servant à l'ouverture de la petite zone, qui est montée sur le panneau formant couvercle et dans lequel couvercle, la ligne entaillée (8; 11; 21; 31) présente comme ligne d'affaiblissement deux parois latérales (49a, 49b; 16) et une base linéaire (8g, 48); caractérisé en ce que :
    a) au moins l'une des parois latérales (49a, 49b) d'une section courte (24) de la ligne d'affaiblissement s'étend de manière plus raide que dans les deux sections limitrophes de la ligne d'affaiblissement, et les parois latérales de la courte section présentent une distance mutuelle, où :
    i. la base linéaire présente une section transversale à profil arrondi, ou
    ii. la distance est plus petite que dans les sections adjacentes, ou
    iii. la base linéaire (8g) présente, en coupe transversale, une forme sensiblement circulaire, avec un point d'étranglement dans la transition avec les parois latérales;
    ou
    b) au moins l'une des parois latérales (49a; 49b) d'une section courte (24) se fond, via une élévation (37a, 37b), dans le panneau formant couvercle et, en dehors de la section courte (24), se fond sans élévation de ce type directement (16a, 16b) dans le panneau formant couvercle (20, 30).
  8. Procédé de fabrication d'un couvercle avec un panneau formant couvercle (20, 30) selon la revendication 1, caractérisé en ce que, dans une première étape de travail, une ligne entaillée d'ouverture (21, 31) est estampée pour fixer un segment d'ouverture (22, 33) dans le panneau du couvercle (1, 9) et, dans une section (24, L) de longueur limitée (courte) de la ligne entaillée (21, 31) servant à l'ouverture du couvercle, une structure métallique (38) d'une paroi résiduelle (42) restant en dessous de la ligne entaillée d'ouverture est densifiée par rapport à une structure (19) des zones métalliques situées en dessous des sections adjacentes de la ligne entaillée (21, 31).
  9. Procédé de fabrication d'une ligne entaillée anti-éclatement dans un couvercle, caractérisé en ce que, le long d'une section limitée (24, 25) d'une ligne entaillée (21, 31) estampée pour l'ouverture, la tôle métallique est écrasée, estampée ou refoulée en forme d'entonnoir sur au moins un côté de la ligne entaillée (27a, 27b, Q1, Q2) pour densifier la structure en dessous de la ligne entaillée ou obtenir une section bloquante déchargée des tensions de traction dans la section limitée (24).
  10. Procédé selon la revendication 8, dans lequel la structure métallique (38), en particulier les lignes d'écoulement (38x, 38y) de la structure de la paroi résiduelle (42), en dessous de la ligne entaillée (21, 31) servant à l'ouverture, est densifiée par un écrasement de la tôle du couvercle, sur l'un ou les deux côtés, correspondant à la première opération de travail, mais plus court, dans la section limitée (24) de la ligne entaillée et à (faible) distance (28) de celle-ci et est débarrassée de tensions internes.
  11. Procédé selon la revendication 8, caractérisé en ce qu'au moins une déformation supplémentaire en forme d'entaille (27a, 27b, Q1, Q2) est estampée dans une seconde opération de travail après l'estampage de la ligne entaillée (21, 31) servant à l'ouverture.
  12. Procédé selon l'une quelconque des revendications 9 à 11, caractérisé en ce que le au moins un écrasement supplémentaire (Q1, Q2) - menant à la modification de la structure métallique (38) en dessous de la ligne entaillée servant à l'ouverture est effectué jusqu'à une seconde profondeur (d-d1) dépassant la première profondeur de la ligne entaillée d'ouverture (21, 31).
  13. Procédé selon la revendication 10, dans lequel la densification mène à une zone neutre au plan des tensions, qui possède, en dessous de la ligne entaillée (21, 31), une résistance au cisaillement plus élevée que les sections de la ligne entaillée des deux côtés de la zone (24), en observant dans la direction de la ligne entaillée.
  14. Couvercle en métal comprenant un système d'ouverture (22, 33, 6, 14) pour des récipients se trouvant, à l'état fermé, sous surpression ou dépression, notamment pour boîtes de boisson ou analogues, une ligne entaillée (21, 31) déterminant une zone enfonçable (22, 23) du couvercle et une patte en forme de levier (6; 14) servant à l'ouverture ou analogue, qui est agencée sur le couvercle, dans lequel il est prévu un moyen (7; 10, 7a) pour commander, lors de l'ouverture initiale, un déroulement de l'opération d'ouverture difficile à contrôler;
    caractérisé en ce que
       ce moyen est une seconde structure métallique (38; 38x; 38y) s'écartant d'une première structure métallique (19) dans la zone d'une paroi résiduelle (d2) en dessous de la ligne entaillée (8; 11) en dessous d'une section courte (24, 25) de la ligne entaillée (21, 31), où une tension interne du métal est au moins plus faible qu'en dessous des sections restantes de la ligne entaillée (21, 31).
  15. Couvercle selon la revendication 14, dans lequel la ligne entaillée est plus étroite (b2) dans la section courte (24) que dans les sections adjacentes avec leur largeur associée (b1).
  16. Couvercle selon la revendication 15, dans lequel une largeur (b2) de la ligne entaillée (21, 31) atteint, dans la section courte (24), sensiblement 30% à 70%, en particulier moins de 50%, de la largeur (b1) de la ligne entaillée dans au moins les sections adjacentes.
EP99953760A 1998-10-08 1999-10-08 Systeme anti-eclatement temporaire installe dans un couvercle en tole Expired - Lifetime EP1121299B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19846243 1998-10-08
DE19846243 1998-10-08
PCT/EP1999/007564 WO2000021846A1 (fr) 1998-10-08 1999-10-08 Systeme anti-eclatement temporaire installe dans un couvercle en tole

Publications (2)

Publication Number Publication Date
EP1121299A1 EP1121299A1 (fr) 2001-08-08
EP1121299B1 true EP1121299B1 (fr) 2003-09-10

Family

ID=7883729

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Application Number Title Priority Date Filing Date
EP99953760A Expired - Lifetime EP1121299B1 (fr) 1998-10-08 1999-10-08 Systeme anti-eclatement temporaire installe dans un couvercle en tole

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US (1) US6908005B1 (fr)
EP (1) EP1121299B1 (fr)
AT (1) ATE249369T1 (fr)
AU (1) AU1034100A (fr)
BR (1) BR9914351A (fr)
DE (2) DE59906972D1 (fr)
ES (1) ES2207971T3 (fr)
WO (1) WO2000021846A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9114451B2 (en) 2013-03-15 2015-08-25 Ball Corporation Container end closure with buckle control feature
WO2014151503A1 (fr) * 2013-03-15 2014-09-25 Ball Corporation Fermeture d'extrémité avec double entaille anti-projection
US10881036B2 (en) 2019-03-04 2020-12-29 Cisco Technology, Inc. Minimizing or alleviating stress in a surface of a sheet metal structure caused by addition of surface features to the structure
CA3185932A1 (fr) * 2020-07-13 2022-01-20 Kerry MENTASTI GRANELLI Couvercle pour contenants de substances et contenant de substances comprenant ledit couvercle

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303959A (en) * 1964-11-02 1967-02-14 Dayton Reliable Tool And Mfg C Can top
US3315837A (en) * 1964-11-25 1967-04-25 Continental Can Co Easy opening end
NO120458B (fr) * 1966-10-05 1970-10-19 Aluminum Co Of America
US3406866A (en) 1967-06-16 1968-10-22 Continental Can Co Container panel with antifracture score
BE790027A (fr) * 1971-10-19 1973-04-13 Aluminum Co Of America Procede de fabrication de paroi de recipient comportant un dispositif d'ouverture faisant corps avec elle, et structure de paroide recipient fabriquee par ce procede
US3968899A (en) * 1974-03-14 1976-07-13 Aluminum Company Of America Easy-open container wall and apparatus
BE884123Q (nl) * 1978-11-29 1981-01-05 Continental Group Inkerfgereedschap en -aambeeld
NL8702497A (nl) 1987-10-19 1989-05-16 Michael John Mary Doyle Eindwand met losscheurbare sluitlip voor onder druk staande houder.
US5375729A (en) * 1993-04-21 1994-12-27 Dayton Reliable Tool & Mfg. Co. Easy-open container end
EP0737624B1 (fr) 1995-04-14 1999-10-13 Impress Metal Packaging Sa Procédé de fabrication d'un couvercle à ouverture facile à incision dans une zone inclinée

Also Published As

Publication number Publication date
ATE249369T1 (de) 2003-09-15
US6908005B1 (en) 2005-06-21
WO2000021846A1 (fr) 2000-04-20
EP1121299A1 (fr) 2001-08-08
ES2207971T3 (es) 2004-06-01
DE59906972D1 (de) 2003-10-16
AU1034100A (en) 2000-05-01
DE19982055D2 (de) 2001-08-30
BR9914351A (pt) 2001-06-26

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